diff --git a/README.md b/README.md
index 4fcb1e6d..deaada66 100644
--- a/README.md
+++ b/README.md
@@ -87,8 +87,8 @@ of the project.
 <html>
 <head>
   <title>Timeline basic demo</title>
-  <script src="components/vis/dist/vis.js"></script>
-  <link href="components/vis/dist/vis.css" rel="stylesheet" type="text/css" />
+  <script src="vis/dist/vis.js"></script>
+  <link href="vis/dist/vis.css" rel="stylesheet" type="text/css" />
 
   <style type="text/css">
     body, html {
diff --git a/dist/vis.css b/dist/vis.css
new file mode 100644
index 00000000..4f54a95f
--- /dev/null
+++ b/dist/vis.css
@@ -0,0 +1,235 @@
+.vis.timeline {
+}
+
+
+.vis.timeline.rootpanel {
+  position: relative;
+  overflow: hidden;
+
+  border: 1px solid #bfbfbf;
+  -moz-box-sizing: border-box;
+  box-sizing: border-box;
+}
+
+.vis.timeline .panel {
+  position: absolute;
+  overflow: hidden;
+}
+
+
+.vis.timeline .groupset {
+  position: absolute;
+  padding: 0;
+  margin: 0;
+}
+
+.vis.timeline .labels {
+  position: absolute;
+  top: 0;
+  left: 0;
+  width: 100%;
+  height: 100%;
+
+  padding: 0;
+  margin: 0;
+
+  border-right: 1px solid #bfbfbf;
+  box-sizing: border-box;
+  -moz-box-sizing: border-box;
+}
+
+.vis.timeline .labels .label-set {
+  position: absolute;
+  top: 0;
+  left: 0;
+  width: 100%;
+  height: 100%;
+
+  overflow: hidden;
+
+  border-top: none;
+  border-bottom: 1px solid #bfbfbf;
+}
+
+.vis.timeline .labels .label-set .label {
+  position: absolute;
+  left: 0;
+  top: 0;
+  width: 100%;
+  color: #4d4d4d;
+}
+
+.vis.timeline.top .labels .label-set .label,
+.vis.timeline.top .groupset .itemset-axis {
+  border-top: 1px solid #bfbfbf;
+  border-bottom: none;
+}
+
+.vis.timeline.bottom .labels .label-set .label,
+.vis.timeline.bottom .groupset .itemset-axis {
+  border-top: none;
+  border-bottom: 1px solid #bfbfbf;
+}
+
+.vis.timeline .labels .label-set .label .inner {
+  display: inline-block;
+  padding: 5px;
+}
+
+
+.vis.timeline .itemset {
+  position: absolute;
+  padding: 0;
+  margin: 0;
+  overflow: hidden;
+}
+
+.vis.timeline .background {
+}
+
+.vis.timeline .foreground {
+}
+
+.vis.timeline .itemset-axis {
+  position: absolute;
+}
+
+
+.vis.timeline .item {
+  position: absolute;
+  color: #1A1A1A;
+  border-color: #97B0F8;
+  background-color: #D5DDF6;
+  display: inline-block;
+}
+
+.vis.timeline .item.selected {
+  border-color: #FFC200;
+  background-color: #FFF785;
+  z-index: 999;
+}
+
+.vis.timeline .item.cluster {
+  /* TODO: use another color or pattern? */
+  background: #97B0F8 url('img/cluster_bg.png');
+  color: white;
+}
+.vis.timeline .item.cluster.point {
+  border-color: #D5DDF6;
+}
+
+.vis.timeline .item.box {
+  text-align: center;
+  border-style: solid;
+  border-width: 1px;
+  border-radius: 5px;
+  -moz-border-radius: 5px; /* For Firefox 3.6 and older */
+}
+
+.vis.timeline .item.point {
+  background: none;
+}
+
+.vis.timeline .dot {
+  border: 5px solid #97B0F8;
+  position: absolute;
+  border-radius: 5px;
+  -moz-border-radius: 5px;  /* For Firefox 3.6 and older */
+}
+
+.vis.timeline .item.range {
+  overflow: hidden;
+  border-style: solid;
+  border-width: 1px;
+  border-radius: 2px;
+  -moz-border-radius: 2px;  /* For Firefox 3.6 and older */
+}
+
+.vis.timeline .item.rangeoverflow {
+  border-style: solid;
+  border-width: 1px;
+  border-radius: 2px;
+  -moz-border-radius: 2px;  /* For Firefox 3.6 and older */
+}
+
+.vis.timeline .item.range .drag-left, .vis.timeline .item.rangeoverflow .drag-left {
+  cursor: w-resize;
+  z-index: 1000;
+}
+
+.vis.timeline .item.range .drag-right, .vis.timeline .item.rangeoverflow .drag-right {
+  cursor: e-resize;
+  z-index: 1000;
+}
+
+.vis.timeline .item.range .content, .vis.timeline .item.rangeoverflow .content {
+  position: relative;
+  display: inline-block;
+}
+
+.vis.timeline .item.line {
+  position: absolute;
+  width: 0;
+  border-left-width: 1px;
+  border-left-style: solid;
+}
+
+.vis.timeline .item .content {
+  margin: 5px;
+  white-space: nowrap;
+  overflow: hidden;
+}
+
+.vis.timeline .axis {
+  position: relative;
+}
+
+.vis.timeline .axis .text {
+  position: absolute;
+  color: #4d4d4d;
+  padding: 3px;
+  white-space: nowrap;
+}
+
+.vis.timeline .axis .text.measure {
+  position: absolute;
+  padding-left: 0;
+  padding-right: 0;
+  margin-left: 0;
+  margin-right: 0;
+  visibility: hidden;
+}
+
+.vis.timeline .axis .grid.vertical {
+  position: absolute;
+  width: 0;
+  border-right: 1px solid;
+}
+
+.vis.timeline .axis .grid.horizontal {
+  position: absolute;
+  left: 0;
+  width: 100%;
+  height: 0;
+  border-bottom: 1px solid;
+}
+
+.vis.timeline .axis .grid.minor {
+  border-color: #e5e5e5;
+}
+
+.vis.timeline .axis .grid.major {
+  border-color: #bfbfbf;
+}
+
+.vis.timeline .currenttime {
+  background-color: #FF7F6E;
+  width: 2px;
+  z-index: 9;
+}
+.vis.timeline .customtime {
+  background-color: #6E94FF;
+  width: 2px;
+  cursor: move;
+  z-index: 9;
+}
diff --git a/dist/vis.js b/dist/vis.js
new file mode 100644
index 00000000..7594f2f9
--- /dev/null
+++ b/dist/vis.js
@@ -0,0 +1,15765 @@
+/**
+ * vis.js
+ * https://github.com/almende/vis
+ *
+ * A dynamic, browser-based visualization library.
+ *
+ * @version 0.3.0
+ * @date    2014-01-14
+ *
+ * @license
+ * Copyright (C) 2011-2013 Almende B.V, http://almende.com
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may not
+ * use this file except in compliance with the License. You may obtain a copy
+ * of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations under
+ * the License.
+ */
+!function(e){if("object"==typeof exports)module.exports=e();else if("function"==typeof define&&define.amd)define(e);else{var f;"undefined"!=typeof window?f=window:"undefined"!=typeof global?f=global:"undefined"!=typeof self&&(f=self),f.vis=e()}}(function(){var define,module,exports;return (function e(t,n,r){function s(o,u){if(!n[o]){if(!t[o]){var a=typeof require=="function"&&require;if(!u&&a)return a(o,!0);if(i)return i(o,!0);throw new Error("Cannot find module '"+o+"'")}var f=n[o]={exports:{}};t[o][0].call(f.exports,function(e){var n=t[o][1][e];return s(n?n:e)},f,f.exports,e,t,n,r)}return n[o].exports}var i=typeof require=="function"&&require;for(var o=0;o<r.length;o++)s(r[o]);return s})({1:[function(require,module,exports){
+/**
+ * vis.js module imports
+ */
+
+// Try to load dependencies from the global window object.
+// If not available there, load via require.
+var moment = (typeof window !== 'undefined') && window['moment'] || require('moment');
+
+var Hammer;
+if (typeof window !== 'undefined') {
+  // load hammer.js only when running in a browser (where window is available)
+  Hammer = window['Hammer'] || require('hammerjs');
+}
+else {
+  Hammer = function () {
+    throw Error('hammer.js is only available in a browser, not in node.js.');
+  }
+}
+
+
+// Internet Explorer 8 and older does not support Array.indexOf, so we define
+// it here in that case.
+// http://soledadpenades.com/2007/05/17/arrayindexof-in-internet-explorer/
+if(!Array.prototype.indexOf) {
+  Array.prototype.indexOf = function(obj){
+    for(var i = 0; i < this.length; i++){
+      if(this[i] == obj){
+        return i;
+      }
+    }
+    return -1;
+  };
+
+  try {
+    console.log("Warning: Ancient browser detected. Please update your browser");
+  }
+  catch (err) {
+  }
+}
+
+// Internet Explorer 8 and older does not support Array.forEach, so we define
+// it here in that case.
+// https://developer.mozilla.org/en-US/docs/JavaScript/Reference/Global_Objects/Array/forEach
+if (!Array.prototype.forEach) {
+  Array.prototype.forEach = function(fn, scope) {
+    for(var i = 0, len = this.length; i < len; ++i) {
+      fn.call(scope || this, this[i], i, this);
+    }
+  }
+}
+
+// Internet Explorer 8 and older does not support Array.map, so we define it
+// here in that case.
+// https://developer.mozilla.org/en-US/docs/JavaScript/Reference/Global_Objects/Array/map
+// Production steps of ECMA-262, Edition 5, 15.4.4.19
+// Reference: http://es5.github.com/#x15.4.4.19
+if (!Array.prototype.map) {
+  Array.prototype.map = function(callback, thisArg) {
+
+    var T, A, k;
+
+    if (this == null) {
+      throw new TypeError(" this is null or not defined");
+    }
+
+    // 1. Let O be the result of calling ToObject passing the |this| value as the argument.
+    var O = Object(this);
+
+    // 2. Let lenValue be the result of calling the Get internal method of O with the argument "length".
+    // 3. Let len be ToUint32(lenValue).
+    var len = O.length >>> 0;
+
+    // 4. If IsCallable(callback) is false, throw a TypeError exception.
+    // See: http://es5.github.com/#x9.11
+    if (typeof callback !== "function") {
+      throw new TypeError(callback + " is not a function");
+    }
+
+    // 5. If thisArg was supplied, let T be thisArg; else let T be undefined.
+    if (thisArg) {
+      T = thisArg;
+    }
+
+    // 6. Let A be a new array created as if by the expression new Array(len) where Array is
+    // the standard built-in constructor with that name and len is the value of len.
+    A = new Array(len);
+
+    // 7. Let k be 0
+    k = 0;
+
+    // 8. Repeat, while k < len
+    while(k < len) {
+
+      var kValue, mappedValue;
+
+      // a. Let Pk be ToString(k).
+      //   This is implicit for LHS operands of the in operator
+      // b. Let kPresent be the result of calling the HasProperty internal method of O with argument Pk.
+      //   This step can be combined with c
+      // c. If kPresent is true, then
+      if (k in O) {
+
+        // i. Let kValue be the result of calling the Get internal method of O with argument Pk.
+        kValue = O[ k ];
+
+        // ii. Let mappedValue be the result of calling the Call internal method of callback
+        // with T as the this value and argument list containing kValue, k, and O.
+        mappedValue = callback.call(T, kValue, k, O);
+
+        // iii. Call the DefineOwnProperty internal method of A with arguments
+        // Pk, Property Descriptor {Value: mappedValue, : true, Enumerable: true, Configurable: true},
+        // and false.
+
+        // In browsers that support Object.defineProperty, use the following:
+        // Object.defineProperty(A, Pk, { value: mappedValue, writable: true, enumerable: true, configurable: true });
+
+        // For best browser support, use the following:
+        A[ k ] = mappedValue;
+      }
+      // d. Increase k by 1.
+      k++;
+    }
+
+    // 9. return A
+    return A;
+  };
+}
+
+// Internet Explorer 8 and older does not support Array.filter, so we define it
+// here in that case.
+// https://developer.mozilla.org/en-US/docs/JavaScript/Reference/Global_Objects/Array/filter
+if (!Array.prototype.filter) {
+  Array.prototype.filter = function(fun /*, thisp */) {
+    "use strict";
+
+    if (this == null) {
+      throw new TypeError();
+    }
+
+    var t = Object(this);
+    var len = t.length >>> 0;
+    if (typeof fun != "function") {
+      throw new TypeError();
+    }
+
+    var res = [];
+    var thisp = arguments[1];
+    for (var i = 0; i < len; i++) {
+      if (i in t) {
+        var val = t[i]; // in case fun mutates this
+        if (fun.call(thisp, val, i, t))
+          res.push(val);
+      }
+    }
+
+    return res;
+  };
+}
+
+
+// Internet Explorer 8 and older does not support Object.keys, so we define it
+// here in that case.
+// https://developer.mozilla.org/en-US/docs/JavaScript/Reference/Global_Objects/Object/keys
+if (!Object.keys) {
+  Object.keys = (function () {
+    var hasOwnProperty = Object.prototype.hasOwnProperty,
+        hasDontEnumBug = !({toString: null}).propertyIsEnumerable('toString'),
+        dontEnums = [
+          'toString',
+          'toLocaleString',
+          'valueOf',
+          'hasOwnProperty',
+          'isPrototypeOf',
+          'propertyIsEnumerable',
+          'constructor'
+        ],
+        dontEnumsLength = dontEnums.length;
+
+    return function (obj) {
+      if (typeof obj !== 'object' && typeof obj !== 'function' || obj === null) {
+        throw new TypeError('Object.keys called on non-object');
+      }
+
+      var result = [];
+
+      for (var prop in obj) {
+        if (hasOwnProperty.call(obj, prop)) result.push(prop);
+      }
+
+      if (hasDontEnumBug) {
+        for (var i=0; i < dontEnumsLength; i++) {
+          if (hasOwnProperty.call(obj, dontEnums[i])) result.push(dontEnums[i]);
+        }
+      }
+      return result;
+    }
+  })()
+}
+
+// Internet Explorer 8 and older does not support Array.isArray,
+// so we define it here in that case.
+// https://developer.mozilla.org/en-US/docs/JavaScript/Reference/Global_Objects/Array/isArray
+if(!Array.isArray) {
+  Array.isArray = function (vArg) {
+    return Object.prototype.toString.call(vArg) === "[object Array]";
+  };
+}
+
+// Internet Explorer 8 and older does not support Function.bind,
+// so we define it here in that case.
+// https://developer.mozilla.org/en-US/docs/JavaScript/Reference/Global_Objects/Function/bind
+if (!Function.prototype.bind) {
+  Function.prototype.bind = function (oThis) {
+    if (typeof this !== "function") {
+      // closest thing possible to the ECMAScript 5 internal IsCallable function
+      throw new TypeError("Function.prototype.bind - what is trying to be bound is not callable");
+    }
+
+    var aArgs = Array.prototype.slice.call(arguments, 1),
+        fToBind = this,
+        fNOP = function () {},
+        fBound = function () {
+          return fToBind.apply(this instanceof fNOP && oThis
+              ? this
+              : oThis,
+              aArgs.concat(Array.prototype.slice.call(arguments)));
+        };
+
+    fNOP.prototype = this.prototype;
+    fBound.prototype = new fNOP();
+
+    return fBound;
+  };
+}
+
+// https://developer.mozilla.org/en-US/docs/JavaScript/Reference/Global_Objects/Object/create
+if (!Object.create) {
+  Object.create = function (o) {
+    if (arguments.length > 1) {
+      throw new Error('Object.create implementation only accepts the first parameter.');
+    }
+    function F() {}
+    F.prototype = o;
+    return new F();
+  };
+}
+
+// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function/bind
+if (!Function.prototype.bind) {
+  Function.prototype.bind = function (oThis) {
+    if (typeof this !== "function") {
+      // closest thing possible to the ECMAScript 5 internal IsCallable function
+      throw new TypeError("Function.prototype.bind - what is trying to be bound is not callable");
+    }
+
+    var aArgs = Array.prototype.slice.call(arguments, 1),
+        fToBind = this,
+        fNOP = function () {},
+        fBound = function () {
+          return fToBind.apply(this instanceof fNOP && oThis
+              ? this
+              : oThis,
+              aArgs.concat(Array.prototype.slice.call(arguments)));
+        };
+
+    fNOP.prototype = this.prototype;
+    fBound.prototype = new fNOP();
+
+    return fBound;
+  };
+}
+
+/**
+ * utility functions
+ */
+var util = {};
+
+/**
+ * Test whether given object is a number
+ * @param {*} object
+ * @return {Boolean} isNumber
+ */
+util.isNumber = function isNumber(object) {
+  return (object instanceof Number || typeof object == 'number');
+};
+
+/**
+ * Test whether given object is a string
+ * @param {*} object
+ * @return {Boolean} isString
+ */
+util.isString = function isString(object) {
+  return (object instanceof String || typeof object == 'string');
+};
+
+/**
+ * Test whether given object is a Date, or a String containing a Date
+ * @param {Date | String} object
+ * @return {Boolean} isDate
+ */
+util.isDate = function isDate(object) {
+  if (object instanceof Date) {
+    return true;
+  }
+  else if (util.isString(object)) {
+    // test whether this string contains a date
+    var match = ASPDateRegex.exec(object);
+    if (match) {
+      return true;
+    }
+    else if (!isNaN(Date.parse(object))) {
+      return true;
+    }
+  }
+
+  return false;
+};
+
+/**
+ * Test whether given object is an instance of google.visualization.DataTable
+ * @param {*} object
+ * @return {Boolean} isDataTable
+ */
+util.isDataTable = function isDataTable(object) {
+  return (typeof (google) !== 'undefined') &&
+      (google.visualization) &&
+      (google.visualization.DataTable) &&
+      (object instanceof google.visualization.DataTable);
+};
+
+/**
+ * Create a semi UUID
+ * source: http://stackoverflow.com/a/105074/1262753
+ * @return {String} uuid
+ */
+util.randomUUID = function randomUUID () {
+  var S4 = function () {
+    return Math.floor(
+        Math.random() * 0x10000 /* 65536 */
+    ).toString(16);
+  };
+
+  return (
+      S4() + S4() + '-' +
+          S4() + '-' +
+          S4() + '-' +
+          S4() + '-' +
+          S4() + S4() + S4()
+      );
+};
+
+/**
+ * Extend object a with the properties of object b or a series of objects
+ * Only properties with defined values are copied
+ * @param {Object} a
+ * @param {... Object} b
+ * @return {Object} a
+ */
+util.extend = function (a, b) {
+  for (var i = 1, len = arguments.length; i < len; i++) {
+    var other = arguments[i];
+    for (var prop in other) {
+      if (other.hasOwnProperty(prop) && other[prop] !== undefined) {
+        a[prop] = other[prop];
+      }
+    }
+  }
+
+  return a;
+};
+
+/**
+ * Convert an object to another type
+ * @param {Boolean | Number | String | Date | Moment | Null | undefined} object
+ * @param {String | undefined} type   Name of the type. Available types:
+ *                                    'Boolean', 'Number', 'String',
+ *                                    'Date', 'Moment', ISODate', 'ASPDate'.
+ * @return {*} object
+ * @throws Error
+ */
+util.convert = function convert(object, type) {
+  var match;
+
+  if (object === undefined) {
+    return undefined;
+  }
+  if (object === null) {
+    return null;
+  }
+
+  if (!type) {
+    return object;
+  }
+  if (!(typeof type === 'string') && !(type instanceof String)) {
+    throw new Error('Type must be a string');
+  }
+
+  //noinspection FallthroughInSwitchStatementJS
+  switch (type) {
+    case 'boolean':
+    case 'Boolean':
+      return Boolean(object);
+
+    case 'number':
+    case 'Number':
+      return Number(object.valueOf());
+
+    case 'string':
+    case 'String':
+      return String(object);
+
+    case 'Date':
+      if (util.isNumber(object)) {
+        return new Date(object);
+      }
+      if (object instanceof Date) {
+        return new Date(object.valueOf());
+      }
+      else if (moment.isMoment(object)) {
+        return new Date(object.valueOf());
+      }
+      if (util.isString(object)) {
+        match = ASPDateRegex.exec(object);
+        if (match) {
+          // object is an ASP date
+          return new Date(Number(match[1])); // parse number
+        }
+        else {
+          return moment(object).toDate(); // parse string
+        }
+      }
+      else {
+        throw new Error(
+            'Cannot convert object of type ' + util.getType(object) +
+                ' to type Date');
+      }
+
+    case 'Moment':
+      if (util.isNumber(object)) {
+        return moment(object);
+      }
+      if (object instanceof Date) {
+        return moment(object.valueOf());
+      }
+      else if (moment.isMoment(object)) {
+        return moment(object);
+      }
+      if (util.isString(object)) {
+        match = ASPDateRegex.exec(object);
+        if (match) {
+          // object is an ASP date
+          return moment(Number(match[1])); // parse number
+        }
+        else {
+          return moment(object); // parse string
+        }
+      }
+      else {
+        throw new Error(
+            'Cannot convert object of type ' + util.getType(object) +
+                ' to type Date');
+      }
+
+    case 'ISODate':
+      if (util.isNumber(object)) {
+        return new Date(object);
+      }
+      else if (object instanceof Date) {
+        return object.toISOString();
+      }
+      else if (moment.isMoment(object)) {
+        return object.toDate().toISOString();
+      }
+      else if (util.isString(object)) {
+        match = ASPDateRegex.exec(object);
+        if (match) {
+          // object is an ASP date
+          return new Date(Number(match[1])).toISOString(); // parse number
+        }
+        else {
+          return new Date(object).toISOString(); // parse string
+        }
+      }
+      else {
+        throw new Error(
+            'Cannot convert object of type ' + util.getType(object) +
+                ' to type ISODate');
+      }
+
+    case 'ASPDate':
+      if (util.isNumber(object)) {
+        return '/Date(' + object + ')/';
+      }
+      else if (object instanceof Date) {
+        return '/Date(' + object.valueOf() + ')/';
+      }
+      else if (util.isString(object)) {
+        match = ASPDateRegex.exec(object);
+        var value;
+        if (match) {
+          // object is an ASP date
+          value = new Date(Number(match[1])).valueOf(); // parse number
+        }
+        else {
+          value = new Date(object).valueOf(); // parse string
+        }
+        return '/Date(' + value + ')/';
+      }
+      else {
+        throw new Error(
+            'Cannot convert object of type ' + util.getType(object) +
+                ' to type ASPDate');
+      }
+
+    default:
+      throw new Error('Cannot convert object of type ' + util.getType(object) +
+          ' to type "' + type + '"');
+  }
+};
+
+// parse ASP.Net Date pattern,
+// for example '/Date(1198908717056)/' or '/Date(1198908717056-0700)/'
+// code from http://momentjs.com/
+var ASPDateRegex = /^\/?Date\((\-?\d+)/i;
+
+/**
+ * Get the type of an object, for example util.getType([]) returns 'Array'
+ * @param {*} object
+ * @return {String} type
+ */
+util.getType = function getType(object) {
+  var type = typeof object;
+
+  if (type == 'object') {
+    if (object == null) {
+      return 'null';
+    }
+    if (object instanceof Boolean) {
+      return 'Boolean';
+    }
+    if (object instanceof Number) {
+      return 'Number';
+    }
+    if (object instanceof String) {
+      return 'String';
+    }
+    if (object instanceof Array) {
+      return 'Array';
+    }
+    if (object instanceof Date) {
+      return 'Date';
+    }
+    return 'Object';
+  }
+  else if (type == 'number') {
+    return 'Number';
+  }
+  else if (type == 'boolean') {
+    return 'Boolean';
+  }
+  else if (type == 'string') {
+    return 'String';
+  }
+
+  return type;
+};
+
+/**
+ * Retrieve the absolute left value of a DOM element
+ * @param {Element} elem        A dom element, for example a div
+ * @return {number} left        The absolute left position of this element
+ *                              in the browser page.
+ */
+util.getAbsoluteLeft = function getAbsoluteLeft (elem) {
+  var doc = document.documentElement;
+  var body = document.body;
+
+  var left = elem.offsetLeft;
+  var e = elem.offsetParent;
+  while (e != null && e != body && e != doc) {
+    left += e.offsetLeft;
+    left -= e.scrollLeft;
+    e = e.offsetParent;
+  }
+  return left;
+};
+
+/**
+ * Retrieve the absolute top value of a DOM element
+ * @param {Element} elem        A dom element, for example a div
+ * @return {number} top        The absolute top position of this element
+ *                              in the browser page.
+ */
+util.getAbsoluteTop = function getAbsoluteTop (elem) {
+  var doc = document.documentElement;
+  var body = document.body;
+
+  var top = elem.offsetTop;
+  var e = elem.offsetParent;
+  while (e != null && e != body && e != doc) {
+    top += e.offsetTop;
+    top -= e.scrollTop;
+    e = e.offsetParent;
+  }
+  return top;
+};
+
+/**
+ * Get the absolute, vertical mouse position from an event.
+ * @param {Event} event
+ * @return {Number} pageY
+ */
+util.getPageY = function getPageY (event) {
+  if ('pageY' in event) {
+    return event.pageY;
+  }
+  else {
+    var clientY;
+    if (('targetTouches' in event) && event.targetTouches.length) {
+      clientY = event.targetTouches[0].clientY;
+    }
+    else {
+      clientY = event.clientY;
+    }
+
+    var doc = document.documentElement;
+    var body = document.body;
+    return clientY +
+        ( doc && doc.scrollTop || body && body.scrollTop || 0 ) -
+        ( doc && doc.clientTop || body && body.clientTop || 0 );
+  }
+};
+
+/**
+ * Get the absolute, horizontal mouse position from an event.
+ * @param {Event} event
+ * @return {Number} pageX
+ */
+util.getPageX = function getPageX (event) {
+  if ('pageY' in event) {
+    return event.pageX;
+  }
+  else {
+    var clientX;
+    if (('targetTouches' in event) && event.targetTouches.length) {
+      clientX = event.targetTouches[0].clientX;
+    }
+    else {
+      clientX = event.clientX;
+    }
+
+    var doc = document.documentElement;
+    var body = document.body;
+    return clientX +
+        ( doc && doc.scrollLeft || body && body.scrollLeft || 0 ) -
+        ( doc && doc.clientLeft || body && body.clientLeft || 0 );
+  }
+};
+
+/**
+ * add a className to the given elements style
+ * @param {Element} elem
+ * @param {String} className
+ */
+util.addClassName = function addClassName(elem, className) {
+  var classes = elem.className.split(' ');
+  if (classes.indexOf(className) == -1) {
+    classes.push(className); // add the class to the array
+    elem.className = classes.join(' ');
+  }
+};
+
+/**
+ * add a className to the given elements style
+ * @param {Element} elem
+ * @param {String} className
+ */
+util.removeClassName = function removeClassname(elem, className) {
+  var classes = elem.className.split(' ');
+  var index = classes.indexOf(className);
+  if (index != -1) {
+    classes.splice(index, 1); // remove the class from the array
+    elem.className = classes.join(' ');
+  }
+};
+
+/**
+ * For each method for both arrays and objects.
+ * In case of an array, the built-in Array.forEach() is applied.
+ * In case of an Object, the method loops over all properties of the object.
+ * @param {Object | Array} object   An Object or Array
+ * @param {function} callback       Callback method, called for each item in
+ *                                  the object or array with three parameters:
+ *                                  callback(value, index, object)
+ */
+util.forEach = function forEach (object, callback) {
+  var i,
+      len;
+  if (object instanceof Array) {
+    // array
+    for (i = 0, len = object.length; i < len; i++) {
+      callback(object[i], i, object);
+    }
+  }
+  else {
+    // object
+    for (i in object) {
+      if (object.hasOwnProperty(i)) {
+        callback(object[i], i, object);
+      }
+    }
+  }
+};
+
+/**
+ * Update a property in an object
+ * @param {Object} object
+ * @param {String} key
+ * @param {*} value
+ * @return {Boolean} changed
+ */
+util.updateProperty = function updateProp (object, key, value) {
+  if (object[key] !== value) {
+    object[key] = value;
+    return true;
+  }
+  else {
+    return false;
+  }
+};
+
+/**
+ * Add and event listener. Works for all browsers
+ * @param {Element}     element    An html element
+ * @param {string}      action     The action, for example "click",
+ *                                 without the prefix "on"
+ * @param {function}    listener   The callback function to be executed
+ * @param {boolean}     [useCapture]
+ */
+util.addEventListener = function addEventListener(element, action, listener, useCapture) {
+  if (element.addEventListener) {
+    if (useCapture === undefined)
+      useCapture = false;
+
+    if (action === "mousewheel" && navigator.userAgent.indexOf("Firefox") >= 0) {
+      action = "DOMMouseScroll";  // For Firefox
+    }
+
+    element.addEventListener(action, listener, useCapture);
+  } else {
+    element.attachEvent("on" + action, listener);  // IE browsers
+  }
+};
+
+/**
+ * Remove an event listener from an element
+ * @param {Element}     element         An html dom element
+ * @param {string}      action          The name of the event, for example "mousedown"
+ * @param {function}    listener        The listener function
+ * @param {boolean}     [useCapture]
+ */
+util.removeEventListener = function removeEventListener(element, action, listener, useCapture) {
+  if (element.removeEventListener) {
+    // non-IE browsers
+    if (useCapture === undefined)
+      useCapture = false;
+
+    if (action === "mousewheel" && navigator.userAgent.indexOf("Firefox") >= 0) {
+      action = "DOMMouseScroll";  // For Firefox
+    }
+
+    element.removeEventListener(action, listener, useCapture);
+  } else {
+    // IE browsers
+    element.detachEvent("on" + action, listener);
+  }
+};
+
+
+/**
+ * Get HTML element which is the target of the event
+ * @param {Event} event
+ * @return {Element} target element
+ */
+util.getTarget = function getTarget(event) {
+  // code from http://www.quirksmode.org/js/events_properties.html
+  if (!event) {
+    event = window.event;
+  }
+
+  var target;
+
+  if (event.target) {
+    target = event.target;
+  }
+  else if (event.srcElement) {
+    target = event.srcElement;
+  }
+
+  if (target.nodeType != undefined && target.nodeType == 3) {
+    // defeat Safari bug
+    target = target.parentNode;
+  }
+
+  return target;
+};
+
+/**
+ * Stop event propagation
+ */
+util.stopPropagation = function stopPropagation(event) {
+  if (!event)
+    event = window.event;
+
+  if (event.stopPropagation) {
+    event.stopPropagation();  // non-IE browsers
+  }
+  else {
+    event.cancelBubble = true;  // IE browsers
+  }
+};
+
+/**
+ * Fake a hammer.js gesture. Event can be a ScrollEvent or MouseMoveEvent
+ * @param {Element} element
+ * @param {Event} event
+ */
+util.fakeGesture = function fakeGesture (element, event) {
+  var eventType = null;
+
+  // for hammer.js 1.0.5
+  return Hammer.event.collectEventData(this, eventType, event);
+
+  // for hammer.js 1.0.6
+  //var touches = Hammer.event.getTouchList(event, eventType);
+  //return Hammer.event.collectEventData(this, eventType, touches, event);
+};
+
+/**
+ * Cancels the event if it is cancelable, without stopping further propagation of the event.
+ */
+util.preventDefault = function preventDefault (event) {
+  if (!event)
+    event = window.event;
+
+  if (event.preventDefault) {
+    event.preventDefault();  // non-IE browsers
+  }
+  else {
+    event.returnValue = false;  // IE browsers
+  }
+};
+
+
+util.option = {};
+
+/**
+ * Convert a value into a boolean
+ * @param {Boolean | function | undefined} value
+ * @param {Boolean} [defaultValue]
+ * @returns {Boolean} bool
+ */
+util.option.asBoolean = function (value, defaultValue) {
+  if (typeof value == 'function') {
+    value = value();
+  }
+
+  if (value != null) {
+    return (value != false);
+  }
+
+  return defaultValue || null;
+};
+
+/**
+ * Convert a value into a number
+ * @param {Boolean | function | undefined} value
+ * @param {Number} [defaultValue]
+ * @returns {Number} number
+ */
+util.option.asNumber = function (value, defaultValue) {
+  if (typeof value == 'function') {
+    value = value();
+  }
+
+  if (value != null) {
+    return Number(value) || defaultValue || null;
+  }
+
+  return defaultValue || null;
+};
+
+/**
+ * Convert a value into a string
+ * @param {String | function | undefined} value
+ * @param {String} [defaultValue]
+ * @returns {String} str
+ */
+util.option.asString = function (value, defaultValue) {
+  if (typeof value == 'function') {
+    value = value();
+  }
+
+  if (value != null) {
+    return String(value);
+  }
+
+  return defaultValue || null;
+};
+
+/**
+ * Convert a size or location into a string with pixels or a percentage
+ * @param {String | Number | function | undefined} value
+ * @param {String} [defaultValue]
+ * @returns {String} size
+ */
+util.option.asSize = function (value, defaultValue) {
+  if (typeof value == 'function') {
+    value = value();
+  }
+
+  if (util.isString(value)) {
+    return value;
+  }
+  else if (util.isNumber(value)) {
+    return value + 'px';
+  }
+  else {
+    return defaultValue || null;
+  }
+};
+
+/**
+ * Convert a value into a DOM element
+ * @param {HTMLElement | function | undefined} value
+ * @param {HTMLElement} [defaultValue]
+ * @returns {HTMLElement | null} dom
+ */
+util.option.asElement = function (value, defaultValue) {
+  if (typeof value == 'function') {
+    value = value();
+  }
+
+  return value || defaultValue || null;
+};
+
+/**
+ * Event listener (singleton)
+ */
+// TODO: replace usage of the event listener for the EventBus
+var events = {
+  'listeners': [],
+
+  /**
+   * Find a single listener by its object
+   * @param {Object} object
+   * @return {Number} index  -1 when not found
+   */
+  'indexOf': function (object) {
+    var listeners = this.listeners;
+    for (var i = 0, iMax = this.listeners.length; i < iMax; i++) {
+      var listener = listeners[i];
+      if (listener && listener.object == object) {
+        return i;
+      }
+    }
+    return -1;
+  },
+
+  /**
+   * Add an event listener
+   * @param {Object} object
+   * @param {String} event       The name of an event, for example 'select'
+   * @param {function} callback  The callback method, called when the
+   *                             event takes place
+   */
+  'addListener': function (object, event, callback) {
+    var index = this.indexOf(object);
+    var listener = this.listeners[index];
+    if (!listener) {
+      listener = {
+        'object': object,
+        'events': {}
+      };
+      this.listeners.push(listener);
+    }
+
+    var callbacks = listener.events[event];
+    if (!callbacks) {
+      callbacks = [];
+      listener.events[event] = callbacks;
+    }
+
+    // add the callback if it does not yet exist
+    if (callbacks.indexOf(callback) == -1) {
+      callbacks.push(callback);
+    }
+  },
+
+  /**
+   * Remove an event listener
+   * @param {Object} object
+   * @param {String} event       The name of an event, for example 'select'
+   * @param {function} callback  The registered callback method
+   */
+  'removeListener': function (object, event, callback) {
+    var index = this.indexOf(object);
+    var listener = this.listeners[index];
+    if (listener) {
+      var callbacks = listener.events[event];
+      if (callbacks) {
+        index = callbacks.indexOf(callback);
+        if (index != -1) {
+          callbacks.splice(index, 1);
+        }
+
+        // remove the array when empty
+        if (callbacks.length == 0) {
+          delete listener.events[event];
+        }
+      }
+
+      // count the number of registered events. remove listener when empty
+      var count = 0;
+      var events = listener.events;
+      for (var e in events) {
+        if (events.hasOwnProperty(e)) {
+          count++;
+        }
+      }
+      if (count == 0) {
+        delete this.listeners[index];
+      }
+    }
+  },
+
+  /**
+   * Remove all registered event listeners
+   */
+  'removeAllListeners': function () {
+    this.listeners = [];
+  },
+
+  /**
+   * Trigger an event. All registered event handlers will be called
+   * @param {Object} object
+   * @param {String} event
+   * @param {Object} properties (optional)
+   */
+  'trigger': function (object, event, properties) {
+    var index = this.indexOf(object);
+    var listener = this.listeners[index];
+    if (listener) {
+      var callbacks = listener.events[event];
+      if (callbacks) {
+        for (var i = 0, iMax = callbacks.length; i < iMax; i++) {
+          callbacks[i](properties);
+        }
+      }
+    }
+  }
+};
+
+/**
+ * An event bus can be used to emit events, and to subscribe to events
+ * @constructor EventBus
+ */
+function EventBus() {
+  this.subscriptions = [];
+}
+
+/**
+ * Subscribe to an event
+ * @param {String | RegExp} event   The event can be a regular expression, or
+ *                                  a string with wildcards, like 'server.*'.
+ * @param {function} callback.      Callback are called with three parameters:
+ *                                  {String} event, {*} [data], {*} [source]
+ * @param {*} [target]
+ * @returns {String} id    A subscription id
+ */
+EventBus.prototype.on = function (event, callback, target) {
+  var regexp = (event instanceof RegExp) ?
+      event :
+      new RegExp(event.replace('*', '\\w+'));
+
+  var subscription = {
+    id:       util.randomUUID(),
+    event:    event,
+    regexp:   regexp,
+    callback: (typeof callback === 'function') ? callback : null,
+    target:   target
+  };
+
+  this.subscriptions.push(subscription);
+
+  return subscription.id;
+};
+
+/**
+ * Unsubscribe from an event
+ * @param {String | Object} filter   Filter for subscriptions to be removed
+ *                                   Filter can be a string containing a
+ *                                   subscription id, or an object containing
+ *                                   one or more of the fields id, event,
+ *                                   callback, and target.
+ */
+EventBus.prototype.off = function (filter) {
+  var i = 0;
+  while (i < this.subscriptions.length) {
+    var subscription = this.subscriptions[i];
+
+    var match = true;
+    if (filter instanceof Object) {
+      // filter is an object. All fields must match
+      for (var prop in filter) {
+        if (filter.hasOwnProperty(prop)) {
+          if (filter[prop] !== subscription[prop]) {
+            match = false;
+          }
+        }
+      }
+    }
+    else {
+      // filter is a string, filter on id
+      match = (subscription.id == filter);
+    }
+
+    if (match) {
+      this.subscriptions.splice(i, 1);
+    }
+    else {
+      i++;
+    }
+  }
+};
+
+/**
+ * Emit an event
+ * @param {String} event
+ * @param {*} [data]
+ * @param {*} [source]
+ */
+EventBus.prototype.emit = function (event, data, source) {
+  for (var i =0; i < this.subscriptions.length; i++) {
+    var subscription = this.subscriptions[i];
+    if (subscription.regexp.test(event)) {
+      if (subscription.callback) {
+        subscription.callback(event, data, source);
+      }
+    }
+  }
+};
+
+/**
+ * DataSet
+ *
+ * Usage:
+ *     var dataSet = new DataSet({
+ *         fieldId: '_id',
+ *         convert: {
+ *             // ...
+ *         }
+ *     });
+ *
+ *     dataSet.add(item);
+ *     dataSet.add(data);
+ *     dataSet.update(item);
+ *     dataSet.update(data);
+ *     dataSet.remove(id);
+ *     dataSet.remove(ids);
+ *     var data = dataSet.get();
+ *     var data = dataSet.get(id);
+ *     var data = dataSet.get(ids);
+ *     var data = dataSet.get(ids, options, data);
+ *     dataSet.clear();
+ *
+ * A data set can:
+ * - add/remove/update data
+ * - gives triggers upon changes in the data
+ * - can  import/export data in various data formats
+ *
+ * @param {Object} [options]   Available options:
+ *                             {String} fieldId Field name of the id in the
+ *                                              items, 'id' by default.
+ *                             {Object.<String, String} convert
+ *                                              A map with field names as key,
+ *                                              and the field type as value.
+ * @constructor DataSet
+ */
+// TODO: add a DataSet constructor DataSet(data, options)
+function DataSet (options) {
+  this.id = util.randomUUID();
+
+  this.options = options || {};
+  this.data = {};                                 // map with data indexed by id
+  this.fieldId = this.options.fieldId || 'id';    // name of the field containing id
+  this.convert = {};                              // field types by field name
+
+  if (this.options.convert) {
+    for (var field in this.options.convert) {
+      if (this.options.convert.hasOwnProperty(field)) {
+        var value = this.options.convert[field];
+        if (value == 'Date' || value == 'ISODate' || value == 'ASPDate') {
+          this.convert[field] = 'Date';
+        }
+        else {
+          this.convert[field] = value;
+        }
+      }
+    }
+  }
+
+  // event subscribers
+  this.subscribers = {};
+
+  this.internalIds = {};            // internally generated id's
+}
+
+/**
+ * Subscribe to an event, add an event listener
+ * @param {String} event        Event name. Available events: 'put', 'update',
+ *                              'remove'
+ * @param {function} callback   Callback method. Called with three parameters:
+ *                                  {String} event
+ *                                  {Object | null} params
+ *                                  {String | Number} senderId
+ */
+DataSet.prototype.subscribe = function (event, callback) {
+  var subscribers = this.subscribers[event];
+  if (!subscribers) {
+    subscribers = [];
+    this.subscribers[event] = subscribers;
+  }
+
+  subscribers.push({
+    callback: callback
+  });
+};
+
+/**
+ * Unsubscribe from an event, remove an event listener
+ * @param {String} event
+ * @param {function} callback
+ */
+DataSet.prototype.unsubscribe = function (event, callback) {
+  var subscribers = this.subscribers[event];
+  if (subscribers) {
+    this.subscribers[event] = subscribers.filter(function (listener) {
+      return (listener.callback != callback);
+    });
+  }
+};
+
+/**
+ * Trigger an event
+ * @param {String} event
+ * @param {Object | null} params
+ * @param {String} [senderId]       Optional id of the sender.
+ * @private
+ */
+DataSet.prototype._trigger = function (event, params, senderId) {
+  if (event == '*') {
+    throw new Error('Cannot trigger event *');
+  }
+
+  var subscribers = [];
+  if (event in this.subscribers) {
+    subscribers = subscribers.concat(this.subscribers[event]);
+  }
+  if ('*' in this.subscribers) {
+    subscribers = subscribers.concat(this.subscribers['*']);
+  }
+
+  for (var i = 0; i < subscribers.length; i++) {
+    var subscriber = subscribers[i];
+    if (subscriber.callback) {
+      subscriber.callback(event, params, senderId || null);
+    }
+  }
+};
+
+/**
+ * Add data.
+ * Adding an item will fail when there already is an item with the same id.
+ * @param {Object | Array | DataTable} data
+ * @param {String} [senderId] Optional sender id
+ * @return {Array} addedIds      Array with the ids of the added items
+ */
+DataSet.prototype.add = function (data, senderId) {
+  var addedIds = [],
+      id,
+      me = this;
+
+  if (data instanceof Array) {
+    // Array
+    for (var i = 0, len = data.length; i < len; i++) {
+      id = me._addItem(data[i]);
+      addedIds.push(id);
+    }
+  }
+  else if (util.isDataTable(data)) {
+    // Google DataTable
+    var columns = this._getColumnNames(data);
+    for (var row = 0, rows = data.getNumberOfRows(); row < rows; row++) {
+      var item = {};
+      for (var col = 0, cols = columns.length; col < cols; col++) {
+        var field = columns[col];
+        item[field] = data.getValue(row, col);
+      }
+
+      id = me._addItem(item);
+      addedIds.push(id);
+    }
+  }
+  else if (data instanceof Object) {
+    // Single item
+    id = me._addItem(data);
+    addedIds.push(id);
+  }
+  else {
+    throw new Error('Unknown dataType');
+  }
+
+  if (addedIds.length) {
+    this._trigger('add', {items: addedIds}, senderId);
+  }
+
+  return addedIds;
+};
+
+/**
+ * Update existing items. When an item does not exist, it will be created
+ * @param {Object | Array | DataTable} data
+ * @param {String} [senderId] Optional sender id
+ * @return {Array} updatedIds     The ids of the added or updated items
+ */
+DataSet.prototype.update = function (data, senderId) {
+  var addedIds = [],
+      updatedIds = [],
+      me = this,
+      fieldId = me.fieldId;
+
+  var addOrUpdate = function (item) {
+    var id = item[fieldId];
+    if (me.data[id]) {
+      // update item
+      id = me._updateItem(item);
+      updatedIds.push(id);
+    }
+    else {
+      // add new item
+      id = me._addItem(item);
+      addedIds.push(id);
+    }
+  };
+
+  if (data instanceof Array) {
+    // Array
+    for (var i = 0, len = data.length; i < len; i++) {
+      addOrUpdate(data[i]);
+    }
+  }
+  else if (util.isDataTable(data)) {
+    // Google DataTable
+    var columns = this._getColumnNames(data);
+    for (var row = 0, rows = data.getNumberOfRows(); row < rows; row++) {
+      var item = {};
+      for (var col = 0, cols = columns.length; col < cols; col++) {
+        var field = columns[col];
+        item[field] = data.getValue(row, col);
+      }
+
+      addOrUpdate(item);
+    }
+  }
+  else if (data instanceof Object) {
+    // Single item
+    addOrUpdate(data);
+  }
+  else {
+    throw new Error('Unknown dataType');
+  }
+
+  if (addedIds.length) {
+    this._trigger('add', {items: addedIds}, senderId);
+  }
+  if (updatedIds.length) {
+    this._trigger('update', {items: updatedIds}, senderId);
+  }
+
+  return addedIds.concat(updatedIds);
+};
+
+/**
+ * Get a data item or multiple items.
+ *
+ * Usage:
+ *
+ *     get()
+ *     get(options: Object)
+ *     get(options: Object, data: Array | DataTable)
+ *
+ *     get(id: Number | String)
+ *     get(id: Number | String, options: Object)
+ *     get(id: Number | String, options: Object, data: Array | DataTable)
+ *
+ *     get(ids: Number[] | String[])
+ *     get(ids: Number[] | String[], options: Object)
+ *     get(ids: Number[] | String[], options: Object, data: Array | DataTable)
+ *
+ * Where:
+ *
+ * {Number | String} id         The id of an item
+ * {Number[] | String{}} ids    An array with ids of items
+ * {Object} options             An Object with options. Available options:
+ *                              {String} [type] Type of data to be returned. Can
+ *                                              be 'DataTable' or 'Array' (default)
+ *                              {Object.<String, String>} [convert]
+ *                              {String[]} [fields] field names to be returned
+ *                              {function} [filter] filter items
+ *                              {String | function} [order] Order the items by
+ *                                  a field name or custom sort function.
+ * {Array | DataTable} [data]   If provided, items will be appended to this
+ *                              array or table. Required in case of Google
+ *                              DataTable.
+ *
+ * @throws Error
+ */
+DataSet.prototype.get = function (args) {
+  var me = this;
+
+  // parse the arguments
+  var id, ids, options, data;
+  var firstType = util.getType(arguments[0]);
+  if (firstType == 'String' || firstType == 'Number') {
+    // get(id [, options] [, data])
+    id = arguments[0];
+    options = arguments[1];
+    data = arguments[2];
+  }
+  else if (firstType == 'Array') {
+    // get(ids [, options] [, data])
+    ids = arguments[0];
+    options = arguments[1];
+    data = arguments[2];
+  }
+  else {
+    // get([, options] [, data])
+    options = arguments[0];
+    data = arguments[1];
+  }
+
+  // determine the return type
+  var type;
+  if (options && options.type) {
+    type = (options.type == 'DataTable') ? 'DataTable' : 'Array';
+
+    if (data && (type != util.getType(data))) {
+      throw new Error('Type of parameter "data" (' + util.getType(data) + ') ' +
+          'does not correspond with specified options.type (' + options.type + ')');
+    }
+    if (type == 'DataTable' && !util.isDataTable(data)) {
+      throw new Error('Parameter "data" must be a DataTable ' +
+          'when options.type is "DataTable"');
+    }
+  }
+  else if (data) {
+    type = (util.getType(data) == 'DataTable') ? 'DataTable' : 'Array';
+  }
+  else {
+    type = 'Array';
+  }
+
+  // build options
+  var convert = options && options.convert || this.options.convert;
+  var filter = options && options.filter;
+  var items = [], item, itemId, i, len;
+
+  // convert items
+  if (id != undefined) {
+    // return a single item
+    item = me._getItem(id, convert);
+    if (filter && !filter(item)) {
+      item = null;
+    }
+  }
+  else if (ids != undefined) {
+    // return a subset of items
+    for (i = 0, len = ids.length; i < len; i++) {
+      item = me._getItem(ids[i], convert);
+      if (!filter || filter(item)) {
+        items.push(item);
+      }
+    }
+  }
+  else {
+    // return all items
+    for (itemId in this.data) {
+      if (this.data.hasOwnProperty(itemId)) {
+        item = me._getItem(itemId, convert);
+        if (!filter || filter(item)) {
+          items.push(item);
+        }
+      }
+    }
+  }
+
+  // order the results
+  if (options && options.order && id == undefined) {
+    this._sort(items, options.order);
+  }
+
+  // filter fields of the items
+  if (options && options.fields) {
+    var fields = options.fields;
+    if (id != undefined) {
+      item = this._filterFields(item, fields);
+    }
+    else {
+      for (i = 0, len = items.length; i < len; i++) {
+        items[i] = this._filterFields(items[i], fields);
+      }
+    }
+  }
+
+  // return the results
+  if (type == 'DataTable') {
+    var columns = this._getColumnNames(data);
+    if (id != undefined) {
+      // append a single item to the data table
+      me._appendRow(data, columns, item);
+    }
+    else {
+      // copy the items to the provided data table
+      for (i = 0, len = items.length; i < len; i++) {
+        me._appendRow(data, columns, items[i]);
+      }
+    }
+    return data;
+  }
+  else {
+    // return an array
+    if (id != undefined) {
+      // a single item
+      return item;
+    }
+    else {
+      // multiple items
+      if (data) {
+        // copy the items to the provided array
+        for (i = 0, len = items.length; i < len; i++) {
+          data.push(items[i]);
+        }
+        return data;
+      }
+      else {
+        // just return our array
+        return items;
+      }
+    }
+  }
+};
+
+/**
+ * Get ids of all items or from a filtered set of items.
+ * @param {Object} [options]    An Object with options. Available options:
+ *                              {function} [filter] filter items
+ *                              {String | function} [order] Order the items by
+ *                                  a field name or custom sort function.
+ * @return {Array} ids
+ */
+DataSet.prototype.getIds = function (options) {
+  var data = this.data,
+      filter = options && options.filter,
+      order = options && options.order,
+      convert = options && options.convert || this.options.convert,
+      i,
+      len,
+      id,
+      item,
+      items,
+      ids = [];
+
+  if (filter) {
+    // get filtered items
+    if (order) {
+      // create ordered list
+      items = [];
+      for (id in data) {
+        if (data.hasOwnProperty(id)) {
+          item = this._getItem(id, convert);
+          if (filter(item)) {
+            items.push(item);
+          }
+        }
+      }
+
+      this._sort(items, order);
+
+      for (i = 0, len = items.length; i < len; i++) {
+        ids[i] = items[i][this.fieldId];
+      }
+    }
+    else {
+      // create unordered list
+      for (id in data) {
+        if (data.hasOwnProperty(id)) {
+          item = this._getItem(id, convert);
+          if (filter(item)) {
+            ids.push(item[this.fieldId]);
+          }
+        }
+      }
+    }
+  }
+  else {
+    // get all items
+    if (order) {
+      // create an ordered list
+      items = [];
+      for (id in data) {
+        if (data.hasOwnProperty(id)) {
+          items.push(data[id]);
+        }
+      }
+
+      this._sort(items, order);
+
+      for (i = 0, len = items.length; i < len; i++) {
+        ids[i] = items[i][this.fieldId];
+      }
+    }
+    else {
+      // create unordered list
+      for (id in data) {
+        if (data.hasOwnProperty(id)) {
+          item = data[id];
+          ids.push(item[this.fieldId]);
+        }
+      }
+    }
+  }
+
+  return ids;
+};
+
+/**
+ * Execute a callback function for every item in the dataset.
+ * The order of the items is not determined.
+ * @param {function} callback
+ * @param {Object} [options]    Available options:
+ *                              {Object.<String, String>} [convert]
+ *                              {String[]} [fields] filter fields
+ *                              {function} [filter] filter items
+ *                              {String | function} [order] Order the items by
+ *                                  a field name or custom sort function.
+ */
+DataSet.prototype.forEach = function (callback, options) {
+  var filter = options && options.filter,
+      convert = options && options.convert || this.options.convert,
+      data = this.data,
+      item,
+      id;
+
+  if (options && options.order) {
+    // execute forEach on ordered list
+    var items = this.get(options);
+
+    for (var i = 0, len = items.length; i < len; i++) {
+      item = items[i];
+      id = item[this.fieldId];
+      callback(item, id);
+    }
+  }
+  else {
+    // unordered
+    for (id in data) {
+      if (data.hasOwnProperty(id)) {
+        item = this._getItem(id, convert);
+        if (!filter || filter(item)) {
+          callback(item, id);
+        }
+      }
+    }
+  }
+};
+
+/**
+ * Map every item in the dataset.
+ * @param {function} callback
+ * @param {Object} [options]    Available options:
+ *                              {Object.<String, String>} [convert]
+ *                              {String[]} [fields] filter fields
+ *                              {function} [filter] filter items
+ *                              {String | function} [order] Order the items by
+ *                                  a field name or custom sort function.
+ * @return {Object[]} mappedItems
+ */
+DataSet.prototype.map = function (callback, options) {
+  var filter = options && options.filter,
+      convert = options && options.convert || this.options.convert,
+      mappedItems = [],
+      data = this.data,
+      item;
+
+  // convert and filter items
+  for (var id in data) {
+    if (data.hasOwnProperty(id)) {
+      item = this._getItem(id, convert);
+      if (!filter || filter(item)) {
+        mappedItems.push(callback(item, id));
+      }
+    }
+  }
+
+  // order items
+  if (options && options.order) {
+    this._sort(mappedItems, options.order);
+  }
+
+  return mappedItems;
+};
+
+/**
+ * Filter the fields of an item
+ * @param {Object} item
+ * @param {String[]} fields     Field names
+ * @return {Object} filteredItem
+ * @private
+ */
+DataSet.prototype._filterFields = function (item, fields) {
+  var filteredItem = {};
+
+  for (var field in item) {
+    if (item.hasOwnProperty(field) && (fields.indexOf(field) != -1)) {
+      filteredItem[field] = item[field];
+    }
+  }
+
+  return filteredItem;
+};
+
+/**
+ * Sort the provided array with items
+ * @param {Object[]} items
+ * @param {String | function} order      A field name or custom sort function.
+ * @private
+ */
+DataSet.prototype._sort = function (items, order) {
+  if (util.isString(order)) {
+    // order by provided field name
+    var name = order; // field name
+    items.sort(function (a, b) {
+      var av = a[name];
+      var bv = b[name];
+      return (av > bv) ? 1 : ((av < bv) ? -1 : 0);
+    });
+  }
+  else if (typeof order === 'function') {
+    // order by sort function
+    items.sort(order);
+  }
+  // TODO: extend order by an Object {field:String, direction:String}
+  //       where direction can be 'asc' or 'desc'
+  else {
+    throw new TypeError('Order must be a function or a string');
+  }
+};
+
+/**
+ * Remove an object by pointer or by id
+ * @param {String | Number | Object | Array} id Object or id, or an array with
+ *                                              objects or ids to be removed
+ * @param {String} [senderId] Optional sender id
+ * @return {Array} removedIds
+ */
+DataSet.prototype.remove = function (id, senderId) {
+  var removedIds = [],
+      i, len, removedId;
+
+  if (id instanceof Array) {
+    for (i = 0, len = id.length; i < len; i++) {
+      removedId = this._remove(id[i]);
+      if (removedId != null) {
+        removedIds.push(removedId);
+      }
+    }
+  }
+  else {
+    removedId = this._remove(id);
+    if (removedId != null) {
+      removedIds.push(removedId);
+    }
+  }
+
+  if (removedIds.length) {
+    this._trigger('remove', {items: removedIds}, senderId);
+  }
+
+  return removedIds;
+};
+
+/**
+ * Remove an item by its id
+ * @param {Number | String | Object} id   id or item
+ * @returns {Number | String | null} id
+ * @private
+ */
+DataSet.prototype._remove = function (id) {
+  if (util.isNumber(id) || util.isString(id)) {
+    if (this.data[id]) {
+      delete this.data[id];
+      delete this.internalIds[id];
+      return id;
+    }
+  }
+  else if (id instanceof Object) {
+    var itemId = id[this.fieldId];
+    if (itemId && this.data[itemId]) {
+      delete this.data[itemId];
+      delete this.internalIds[itemId];
+      return itemId;
+    }
+  }
+  return null;
+};
+
+/**
+ * Clear the data
+ * @param {String} [senderId] Optional sender id
+ * @return {Array} removedIds    The ids of all removed items
+ */
+DataSet.prototype.clear = function (senderId) {
+  var ids = Object.keys(this.data);
+
+  this.data = {};
+  this.internalIds = {};
+
+  this._trigger('remove', {items: ids}, senderId);
+
+  return ids;
+};
+
+/**
+ * Find the item with maximum value of a specified field
+ * @param {String} field
+ * @return {Object | null} item  Item containing max value, or null if no items
+ */
+DataSet.prototype.max = function (field) {
+  var data = this.data,
+      max = null,
+      maxField = null;
+
+  for (var id in data) {
+    if (data.hasOwnProperty(id)) {
+      var item = data[id];
+      var itemField = item[field];
+      if (itemField != null && (!max || itemField > maxField)) {
+        max = item;
+        maxField = itemField;
+      }
+    }
+  }
+
+  return max;
+};
+
+/**
+ * Find the item with minimum value of a specified field
+ * @param {String} field
+ * @return {Object | null} item  Item containing max value, or null if no items
+ */
+DataSet.prototype.min = function (field) {
+  var data = this.data,
+      min = null,
+      minField = null;
+
+  for (var id in data) {
+    if (data.hasOwnProperty(id)) {
+      var item = data[id];
+      var itemField = item[field];
+      if (itemField != null && (!min || itemField < minField)) {
+        min = item;
+        minField = itemField;
+      }
+    }
+  }
+
+  return min;
+};
+
+/**
+ * Find all distinct values of a specified field
+ * @param {String} field
+ * @return {Array} values  Array containing all distinct values. If the data
+ *                         items do not contain the specified field, an array
+ *                         containing a single value undefined is returned.
+ *                         The returned array is unordered.
+ */
+DataSet.prototype.distinct = function (field) {
+  var data = this.data,
+      values = [],
+      fieldType = this.options.convert[field],
+      count = 0;
+
+  for (var prop in data) {
+    if (data.hasOwnProperty(prop)) {
+      var item = data[prop];
+      var value = util.convert(item[field], fieldType);
+      var exists = false;
+      for (var i = 0; i < count; i++) {
+        if (values[i] == value) {
+          exists = true;
+          break;
+        }
+      }
+      if (!exists) {
+        values[count] = value;
+        count++;
+      }
+    }
+  }
+
+  return values;
+};
+
+/**
+ * Add a single item. Will fail when an item with the same id already exists.
+ * @param {Object} item
+ * @return {String} id
+ * @private
+ */
+DataSet.prototype._addItem = function (item) {
+  var id = item[this.fieldId];
+
+  if (id != undefined) {
+    // check whether this id is already taken
+    if (this.data[id]) {
+      // item already exists
+      throw new Error('Cannot add item: item with id ' + id + ' already exists');
+    }
+  }
+  else {
+    // generate an id
+    id = util.randomUUID();
+    item[this.fieldId] = id;
+    this.internalIds[id] = item;
+  }
+
+  var d = {};
+  for (var field in item) {
+    if (item.hasOwnProperty(field)) {
+      var fieldType = this.convert[field];  // type may be undefined
+      d[field] = util.convert(item[field], fieldType);
+    }
+  }
+  this.data[id] = d;
+
+  return id;
+};
+
+/**
+ * Get an item. Fields can be converted to a specific type
+ * @param {String} id
+ * @param {Object.<String, String>} [convert]  field types to convert
+ * @return {Object | null} item
+ * @private
+ */
+DataSet.prototype._getItem = function (id, convert) {
+  var field, value;
+
+  // get the item from the dataset
+  var raw = this.data[id];
+  if (!raw) {
+    return null;
+  }
+
+  // convert the items field types
+  var converted = {},
+      fieldId = this.fieldId,
+      internalIds = this.internalIds;
+  if (convert) {
+    for (field in raw) {
+      if (raw.hasOwnProperty(field)) {
+        value = raw[field];
+        // output all fields, except internal ids
+        if ((field != fieldId) || !(value in internalIds)) {
+          converted[field] = util.convert(value, convert[field]);
+        }
+      }
+    }
+  }
+  else {
+    // no field types specified, no converting needed
+    for (field in raw) {
+      if (raw.hasOwnProperty(field)) {
+        value = raw[field];
+        // output all fields, except internal ids
+        if ((field != fieldId) || !(value in internalIds)) {
+          converted[field] = value;
+        }
+      }
+    }
+  }
+
+  return converted;
+};
+
+/**
+ * Update a single item: merge with existing item.
+ * Will fail when the item has no id, or when there does not exist an item
+ * with the same id.
+ * @param {Object} item
+ * @return {String} id
+ * @private
+ */
+DataSet.prototype._updateItem = function (item) {
+  var id = item[this.fieldId];
+  if (id == undefined) {
+    throw new Error('Cannot update item: item has no id (item: ' + JSON.stringify(item) + ')');
+  }
+  var d = this.data[id];
+  if (!d) {
+    // item doesn't exist
+    throw new Error('Cannot update item: no item with id ' + id + ' found');
+  }
+
+  // merge with current item
+  for (var field in item) {
+    if (item.hasOwnProperty(field)) {
+      var fieldType = this.convert[field];  // type may be undefined
+      d[field] = util.convert(item[field], fieldType);
+    }
+  }
+
+  return id;
+};
+
+/**
+ * Get an array with the column names of a Google DataTable
+ * @param {DataTable} dataTable
+ * @return {String[]} columnNames
+ * @private
+ */
+DataSet.prototype._getColumnNames = function (dataTable) {
+  var columns = [];
+  for (var col = 0, cols = dataTable.getNumberOfColumns(); col < cols; col++) {
+    columns[col] = dataTable.getColumnId(col) || dataTable.getColumnLabel(col);
+  }
+  return columns;
+};
+
+/**
+ * Append an item as a row to the dataTable
+ * @param dataTable
+ * @param columns
+ * @param item
+ * @private
+ */
+DataSet.prototype._appendRow = function (dataTable, columns, item) {
+  var row = dataTable.addRow();
+
+  for (var col = 0, cols = columns.length; col < cols; col++) {
+    var field = columns[col];
+    dataTable.setValue(row, col, item[field]);
+  }
+};
+
+/**
+ * DataView
+ *
+ * a dataview offers a filtered view on a dataset or an other dataview.
+ *
+ * @param {DataSet | DataView} data
+ * @param {Object} [options]   Available options: see method get
+ *
+ * @constructor DataView
+ */
+function DataView (data, options) {
+  this.id = util.randomUUID();
+
+  this.data = null;
+  this.ids = {}; // ids of the items currently in memory (just contains a boolean true)
+  this.options = options || {};
+  this.fieldId = 'id'; // name of the field containing id
+  this.subscribers = {}; // event subscribers
+
+  var me = this;
+  this.listener = function () {
+    me._onEvent.apply(me, arguments);
+  };
+
+  this.setData(data);
+}
+
+// TODO: implement a function .config() to dynamically update things like configured filter
+// and trigger changes accordingly
+
+/**
+ * Set a data source for the view
+ * @param {DataSet | DataView} data
+ */
+DataView.prototype.setData = function (data) {
+  var ids, dataItems, i, len;
+
+  if (this.data) {
+    // unsubscribe from current dataset
+    if (this.data.unsubscribe) {
+      this.data.unsubscribe('*', this.listener);
+    }
+
+    // trigger a remove of all items in memory
+    ids = [];
+    for (var id in this.ids) {
+      if (this.ids.hasOwnProperty(id)) {
+        ids.push(id);
+      }
+    }
+    this.ids = {};
+    this._trigger('remove', {items: ids});
+  }
+
+  this.data = data;
+
+  if (this.data) {
+    // update fieldId
+    this.fieldId = this.options.fieldId ||
+        (this.data && this.data.options && this.data.options.fieldId) ||
+        'id';
+
+    // trigger an add of all added items
+    ids = this.data.getIds({filter: this.options && this.options.filter});
+    for (i = 0, len = ids.length; i < len; i++) {
+      id = ids[i];
+      this.ids[id] = true;
+    }
+    this._trigger('add', {items: ids});
+
+    // subscribe to new dataset
+    if (this.data.subscribe) {
+      this.data.subscribe('*', this.listener);
+    }
+  }
+};
+
+/**
+ * Get data from the data view
+ *
+ * Usage:
+ *
+ *     get()
+ *     get(options: Object)
+ *     get(options: Object, data: Array | DataTable)
+ *
+ *     get(id: Number)
+ *     get(id: Number, options: Object)
+ *     get(id: Number, options: Object, data: Array | DataTable)
+ *
+ *     get(ids: Number[])
+ *     get(ids: Number[], options: Object)
+ *     get(ids: Number[], options: Object, data: Array | DataTable)
+ *
+ * Where:
+ *
+ * {Number | String} id         The id of an item
+ * {Number[] | String{}} ids    An array with ids of items
+ * {Object} options             An Object with options. Available options:
+ *                              {String} [type] Type of data to be returned. Can
+ *                                              be 'DataTable' or 'Array' (default)
+ *                              {Object.<String, String>} [convert]
+ *                              {String[]} [fields] field names to be returned
+ *                              {function} [filter] filter items
+ *                              {String | function} [order] Order the items by
+ *                                  a field name or custom sort function.
+ * {Array | DataTable} [data]   If provided, items will be appended to this
+ *                              array or table. Required in case of Google
+ *                              DataTable.
+ * @param args
+ */
+DataView.prototype.get = function (args) {
+  var me = this;
+
+  // parse the arguments
+  var ids, options, data;
+  var firstType = util.getType(arguments[0]);
+  if (firstType == 'String' || firstType == 'Number' || firstType == 'Array') {
+    // get(id(s) [, options] [, data])
+    ids = arguments[0];  // can be a single id or an array with ids
+    options = arguments[1];
+    data = arguments[2];
+  }
+  else {
+    // get([, options] [, data])
+    options = arguments[0];
+    data = arguments[1];
+  }
+
+  // extend the options with the default options and provided options
+  var viewOptions = util.extend({}, this.options, options);
+
+  // create a combined filter method when needed
+  if (this.options.filter && options && options.filter) {
+    viewOptions.filter = function (item) {
+      return me.options.filter(item) && options.filter(item);
+    }
+  }
+
+  // build up the call to the linked data set
+  var getArguments = [];
+  if (ids != undefined) {
+    getArguments.push(ids);
+  }
+  getArguments.push(viewOptions);
+  getArguments.push(data);
+
+  return this.data && this.data.get.apply(this.data, getArguments);
+};
+
+/**
+ * Get ids of all items or from a filtered set of items.
+ * @param {Object} [options]    An Object with options. Available options:
+ *                              {function} [filter] filter items
+ *                              {String | function} [order] Order the items by
+ *                                  a field name or custom sort function.
+ * @return {Array} ids
+ */
+DataView.prototype.getIds = function (options) {
+  var ids;
+
+  if (this.data) {
+    var defaultFilter = this.options.filter;
+    var filter;
+
+    if (options && options.filter) {
+      if (defaultFilter) {
+        filter = function (item) {
+          return defaultFilter(item) && options.filter(item);
+        }
+      }
+      else {
+        filter = options.filter;
+      }
+    }
+    else {
+      filter = defaultFilter;
+    }
+
+    ids = this.data.getIds({
+      filter: filter,
+      order: options && options.order
+    });
+  }
+  else {
+    ids = [];
+  }
+
+  return ids;
+};
+
+/**
+ * Event listener. Will propagate all events from the connected data set to
+ * the subscribers of the DataView, but will filter the items and only trigger
+ * when there are changes in the filtered data set.
+ * @param {String} event
+ * @param {Object | null} params
+ * @param {String} senderId
+ * @private
+ */
+DataView.prototype._onEvent = function (event, params, senderId) {
+  var i, len, id, item,
+      ids = params && params.items,
+      data = this.data,
+      added = [],
+      updated = [],
+      removed = [];
+
+  if (ids && data) {
+    switch (event) {
+      case 'add':
+        // filter the ids of the added items
+        for (i = 0, len = ids.length; i < len; i++) {
+          id = ids[i];
+          item = this.get(id);
+          if (item) {
+            this.ids[id] = true;
+            added.push(id);
+          }
+        }
+
+        break;
+
+      case 'update':
+        // determine the event from the views viewpoint: an updated
+        // item can be added, updated, or removed from this view.
+        for (i = 0, len = ids.length; i < len; i++) {
+          id = ids[i];
+          item = this.get(id);
+
+          if (item) {
+            if (this.ids[id]) {
+              updated.push(id);
+            }
+            else {
+              this.ids[id] = true;
+              added.push(id);
+            }
+          }
+          else {
+            if (this.ids[id]) {
+              delete this.ids[id];
+              removed.push(id);
+            }
+            else {
+              // nothing interesting for me :-(
+            }
+          }
+        }
+
+        break;
+
+      case 'remove':
+        // filter the ids of the removed items
+        for (i = 0, len = ids.length; i < len; i++) {
+          id = ids[i];
+          if (this.ids[id]) {
+            delete this.ids[id];
+            removed.push(id);
+          }
+        }
+
+        break;
+    }
+
+    if (added.length) {
+      this._trigger('add', {items: added}, senderId);
+    }
+    if (updated.length) {
+      this._trigger('update', {items: updated}, senderId);
+    }
+    if (removed.length) {
+      this._trigger('remove', {items: removed}, senderId);
+    }
+  }
+};
+
+// copy subscription functionality from DataSet
+DataView.prototype.subscribe = DataSet.prototype.subscribe;
+DataView.prototype.unsubscribe = DataSet.prototype.unsubscribe;
+DataView.prototype._trigger = DataSet.prototype._trigger;
+
+/**
+ * @constructor  TimeStep
+ * The class TimeStep is an iterator for dates. You provide a start date and an
+ * end date. The class itself determines the best scale (step size) based on the
+ * provided start Date, end Date, and minimumStep.
+ *
+ * If minimumStep is provided, the step size is chosen as close as possible
+ * to the minimumStep but larger than minimumStep. If minimumStep is not
+ * provided, the scale is set to 1 DAY.
+ * The minimumStep should correspond with the onscreen size of about 6 characters
+ *
+ * Alternatively, you can set a scale by hand.
+ * After creation, you can initialize the class by executing first(). Then you
+ * can iterate from the start date to the end date via next(). You can check if
+ * the end date is reached with the function hasNext(). After each step, you can
+ * retrieve the current date via getCurrent().
+ * The TimeStep has scales ranging from milliseconds, seconds, minutes, hours,
+ * days, to years.
+ *
+ * Version: 1.2
+ *
+ * @param {Date} [start]         The start date, for example new Date(2010, 9, 21)
+ *                               or new Date(2010, 9, 21, 23, 45, 00)
+ * @param {Date} [end]           The end date
+ * @param {Number} [minimumStep] Optional. Minimum step size in milliseconds
+ */
+TimeStep = function(start, end, minimumStep) {
+  // variables
+  this.current = new Date();
+  this._start = new Date();
+  this._end = new Date();
+
+  this.autoScale  = true;
+  this.scale = TimeStep.SCALE.DAY;
+  this.step = 1;
+
+  // initialize the range
+  this.setRange(start, end, minimumStep);
+};
+
+/// enum scale
+TimeStep.SCALE = {
+  MILLISECOND: 1,
+  SECOND: 2,
+  MINUTE: 3,
+  HOUR: 4,
+  DAY: 5,
+  WEEKDAY: 6,
+  MONTH: 7,
+  YEAR: 8
+};
+
+
+/**
+ * Set a new range
+ * If minimumStep is provided, the step size is chosen as close as possible
+ * to the minimumStep but larger than minimumStep. If minimumStep is not
+ * provided, the scale is set to 1 DAY.
+ * The minimumStep should correspond with the onscreen size of about 6 characters
+ * @param {Date} [start]      The start date and time.
+ * @param {Date} [end]        The end date and time.
+ * @param {int} [minimumStep] Optional. Minimum step size in milliseconds
+ */
+TimeStep.prototype.setRange = function(start, end, minimumStep) {
+  if (!(start instanceof Date) || !(end instanceof Date)) {
+    throw  "No legal start or end date in method setRange";
+  }
+
+  this._start = (start != undefined) ? new Date(start.valueOf()) : new Date();
+  this._end = (end != undefined) ? new Date(end.valueOf()) : new Date();
+
+  if (this.autoScale) {
+    this.setMinimumStep(minimumStep);
+  }
+};
+
+/**
+ * Set the range iterator to the start date.
+ */
+TimeStep.prototype.first = function() {
+  this.current = new Date(this._start.valueOf());
+  this.roundToMinor();
+};
+
+/**
+ * Round the current date to the first minor date value
+ * This must be executed once when the current date is set to start Date
+ */
+TimeStep.prototype.roundToMinor = function() {
+  // round to floor
+  // IMPORTANT: we have no breaks in this switch! (this is no bug)
+  //noinspection FallthroughInSwitchStatementJS
+  switch (this.scale) {
+    case TimeStep.SCALE.YEAR:
+      this.current.setFullYear(this.step * Math.floor(this.current.getFullYear() / this.step));
+      this.current.setMonth(0);
+    case TimeStep.SCALE.MONTH:        this.current.setDate(1);
+    case TimeStep.SCALE.DAY:          // intentional fall through
+    case TimeStep.SCALE.WEEKDAY:      this.current.setHours(0);
+    case TimeStep.SCALE.HOUR:         this.current.setMinutes(0);
+    case TimeStep.SCALE.MINUTE:       this.current.setSeconds(0);
+    case TimeStep.SCALE.SECOND:       this.current.setMilliseconds(0);
+    //case TimeStep.SCALE.MILLISECOND: // nothing to do for milliseconds
+  }
+
+  if (this.step != 1) {
+    // round down to the first minor value that is a multiple of the current step size
+    switch (this.scale) {
+      case TimeStep.SCALE.MILLISECOND:  this.current.setMilliseconds(this.current.getMilliseconds() - this.current.getMilliseconds() % this.step);  break;
+      case TimeStep.SCALE.SECOND:       this.current.setSeconds(this.current.getSeconds() - this.current.getSeconds() % this.step); break;
+      case TimeStep.SCALE.MINUTE:       this.current.setMinutes(this.current.getMinutes() - this.current.getMinutes() % this.step); break;
+      case TimeStep.SCALE.HOUR:         this.current.setHours(this.current.getHours() - this.current.getHours() % this.step); break;
+      case TimeStep.SCALE.WEEKDAY:      // intentional fall through
+      case TimeStep.SCALE.DAY:          this.current.setDate((this.current.getDate()-1) - (this.current.getDate()-1) % this.step + 1); break;
+      case TimeStep.SCALE.MONTH:        this.current.setMonth(this.current.getMonth() - this.current.getMonth() % this.step);  break;
+      case TimeStep.SCALE.YEAR:         this.current.setFullYear(this.current.getFullYear() - this.current.getFullYear() % this.step); break;
+      default: break;
+    }
+  }
+};
+
+/**
+ * Check if the there is a next step
+ * @return {boolean}  true if the current date has not passed the end date
+ */
+TimeStep.prototype.hasNext = function () {
+  return (this.current.valueOf() <= this._end.valueOf());
+};
+
+/**
+ * Do the next step
+ */
+TimeStep.prototype.next = function() {
+  var prev = this.current.valueOf();
+
+  // Two cases, needed to prevent issues with switching daylight savings
+  // (end of March and end of October)
+  if (this.current.getMonth() < 6)   {
+    switch (this.scale) {
+      case TimeStep.SCALE.MILLISECOND:
+
+        this.current = new Date(this.current.valueOf() + this.step); break;
+      case TimeStep.SCALE.SECOND:       this.current = new Date(this.current.valueOf() + this.step * 1000); break;
+      case TimeStep.SCALE.MINUTE:       this.current = new Date(this.current.valueOf() + this.step * 1000 * 60); break;
+      case TimeStep.SCALE.HOUR:
+        this.current = new Date(this.current.valueOf() + this.step * 1000 * 60 * 60);
+        // in case of skipping an hour for daylight savings, adjust the hour again (else you get: 0h 5h 9h ... instead of 0h 4h 8h ...)
+        var h = this.current.getHours();
+        this.current.setHours(h - (h % this.step));
+        break;
+      case TimeStep.SCALE.WEEKDAY:      // intentional fall through
+      case TimeStep.SCALE.DAY:          this.current.setDate(this.current.getDate() + this.step); break;
+      case TimeStep.SCALE.MONTH:        this.current.setMonth(this.current.getMonth() + this.step); break;
+      case TimeStep.SCALE.YEAR:         this.current.setFullYear(this.current.getFullYear() + this.step); break;
+      default:                      break;
+    }
+  }
+  else {
+    switch (this.scale) {
+      case TimeStep.SCALE.MILLISECOND:  this.current = new Date(this.current.valueOf() + this.step); break;
+      case TimeStep.SCALE.SECOND:       this.current.setSeconds(this.current.getSeconds() + this.step); break;
+      case TimeStep.SCALE.MINUTE:       this.current.setMinutes(this.current.getMinutes() + this.step); break;
+      case TimeStep.SCALE.HOUR:         this.current.setHours(this.current.getHours() + this.step); break;
+      case TimeStep.SCALE.WEEKDAY:      // intentional fall through
+      case TimeStep.SCALE.DAY:          this.current.setDate(this.current.getDate() + this.step); break;
+      case TimeStep.SCALE.MONTH:        this.current.setMonth(this.current.getMonth() + this.step); break;
+      case TimeStep.SCALE.YEAR:         this.current.setFullYear(this.current.getFullYear() + this.step); break;
+      default:                      break;
+    }
+  }
+
+  if (this.step != 1) {
+    // round down to the correct major value
+    switch (this.scale) {
+      case TimeStep.SCALE.MILLISECOND:  if(this.current.getMilliseconds() < this.step) this.current.setMilliseconds(0);  break;
+      case TimeStep.SCALE.SECOND:       if(this.current.getSeconds() < this.step) this.current.setSeconds(0);  break;
+      case TimeStep.SCALE.MINUTE:       if(this.current.getMinutes() < this.step) this.current.setMinutes(0);  break;
+      case TimeStep.SCALE.HOUR:         if(this.current.getHours() < this.step) this.current.setHours(0);  break;
+      case TimeStep.SCALE.WEEKDAY:      // intentional fall through
+      case TimeStep.SCALE.DAY:          if(this.current.getDate() < this.step+1) this.current.setDate(1); break;
+      case TimeStep.SCALE.MONTH:        if(this.current.getMonth() < this.step) this.current.setMonth(0);  break;
+      case TimeStep.SCALE.YEAR:         break; // nothing to do for year
+      default:                break;
+    }
+  }
+
+  // safety mechanism: if current time is still unchanged, move to the end
+  if (this.current.valueOf() == prev) {
+    this.current = new Date(this._end.valueOf());
+  }
+};
+
+
+/**
+ * Get the current datetime
+ * @return {Date}  current The current date
+ */
+TimeStep.prototype.getCurrent = function() {
+  return this.current;
+};
+
+/**
+ * Set a custom scale. Autoscaling will be disabled.
+ * For example setScale(SCALE.MINUTES, 5) will result
+ * in minor steps of 5 minutes, and major steps of an hour.
+ *
+ * @param {TimeStep.SCALE} newScale
+ *                               A scale. Choose from SCALE.MILLISECOND,
+ *                               SCALE.SECOND, SCALE.MINUTE, SCALE.HOUR,
+ *                               SCALE.WEEKDAY, SCALE.DAY, SCALE.MONTH,
+ *                               SCALE.YEAR.
+ * @param {Number}     newStep   A step size, by default 1. Choose for
+ *                               example 1, 2, 5, or 10.
+ */
+TimeStep.prototype.setScale = function(newScale, newStep) {
+  this.scale = newScale;
+
+  if (newStep > 0) {
+    this.step = newStep;
+  }
+
+  this.autoScale = false;
+};
+
+/**
+ * Enable or disable autoscaling
+ * @param {boolean} enable  If true, autoascaling is set true
+ */
+TimeStep.prototype.setAutoScale = function (enable) {
+  this.autoScale = enable;
+};
+
+
+/**
+ * Automatically determine the scale that bests fits the provided minimum step
+ * @param {Number} [minimumStep]  The minimum step size in milliseconds
+ */
+TimeStep.prototype.setMinimumStep = function(minimumStep) {
+  if (minimumStep == undefined) {
+    return;
+  }
+
+  var stepYear       = (1000 * 60 * 60 * 24 * 30 * 12);
+  var stepMonth      = (1000 * 60 * 60 * 24 * 30);
+  var stepDay        = (1000 * 60 * 60 * 24);
+  var stepHour       = (1000 * 60 * 60);
+  var stepMinute     = (1000 * 60);
+  var stepSecond     = (1000);
+  var stepMillisecond= (1);
+
+  // find the smallest step that is larger than the provided minimumStep
+  if (stepYear*1000 > minimumStep)        {this.scale = TimeStep.SCALE.YEAR;        this.step = 1000;}
+  if (stepYear*500 > minimumStep)         {this.scale = TimeStep.SCALE.YEAR;        this.step = 500;}
+  if (stepYear*100 > minimumStep)         {this.scale = TimeStep.SCALE.YEAR;        this.step = 100;}
+  if (stepYear*50 > minimumStep)          {this.scale = TimeStep.SCALE.YEAR;        this.step = 50;}
+  if (stepYear*10 > minimumStep)          {this.scale = TimeStep.SCALE.YEAR;        this.step = 10;}
+  if (stepYear*5 > minimumStep)           {this.scale = TimeStep.SCALE.YEAR;        this.step = 5;}
+  if (stepYear > minimumStep)             {this.scale = TimeStep.SCALE.YEAR;        this.step = 1;}
+  if (stepMonth*3 > minimumStep)          {this.scale = TimeStep.SCALE.MONTH;       this.step = 3;}
+  if (stepMonth > minimumStep)            {this.scale = TimeStep.SCALE.MONTH;       this.step = 1;}
+  if (stepDay*5 > minimumStep)            {this.scale = TimeStep.SCALE.DAY;         this.step = 5;}
+  if (stepDay*2 > minimumStep)            {this.scale = TimeStep.SCALE.DAY;         this.step = 2;}
+  if (stepDay > minimumStep)              {this.scale = TimeStep.SCALE.DAY;         this.step = 1;}
+  if (stepDay/2 > minimumStep)            {this.scale = TimeStep.SCALE.WEEKDAY;     this.step = 1;}
+  if (stepHour*4 > minimumStep)           {this.scale = TimeStep.SCALE.HOUR;        this.step = 4;}
+  if (stepHour > minimumStep)             {this.scale = TimeStep.SCALE.HOUR;        this.step = 1;}
+  if (stepMinute*15 > minimumStep)        {this.scale = TimeStep.SCALE.MINUTE;      this.step = 15;}
+  if (stepMinute*10 > minimumStep)        {this.scale = TimeStep.SCALE.MINUTE;      this.step = 10;}
+  if (stepMinute*5 > minimumStep)         {this.scale = TimeStep.SCALE.MINUTE;      this.step = 5;}
+  if (stepMinute > minimumStep)           {this.scale = TimeStep.SCALE.MINUTE;      this.step = 1;}
+  if (stepSecond*15 > minimumStep)        {this.scale = TimeStep.SCALE.SECOND;      this.step = 15;}
+  if (stepSecond*10 > minimumStep)        {this.scale = TimeStep.SCALE.SECOND;      this.step = 10;}
+  if (stepSecond*5 > minimumStep)         {this.scale = TimeStep.SCALE.SECOND;      this.step = 5;}
+  if (stepSecond > minimumStep)           {this.scale = TimeStep.SCALE.SECOND;      this.step = 1;}
+  if (stepMillisecond*200 > minimumStep)  {this.scale = TimeStep.SCALE.MILLISECOND; this.step = 200;}
+  if (stepMillisecond*100 > minimumStep)  {this.scale = TimeStep.SCALE.MILLISECOND; this.step = 100;}
+  if (stepMillisecond*50 > minimumStep)   {this.scale = TimeStep.SCALE.MILLISECOND; this.step = 50;}
+  if (stepMillisecond*10 > minimumStep)   {this.scale = TimeStep.SCALE.MILLISECOND; this.step = 10;}
+  if (stepMillisecond*5 > minimumStep)    {this.scale = TimeStep.SCALE.MILLISECOND; this.step = 5;}
+  if (stepMillisecond > minimumStep)      {this.scale = TimeStep.SCALE.MILLISECOND; this.step = 1;}
+};
+
+/**
+ * Snap a date to a rounded value. The snap intervals are dependent on the
+ * current scale and step.
+ * @param {Date} date   the date to be snapped
+ */
+TimeStep.prototype.snap = function(date) {
+  if (this.scale == TimeStep.SCALE.YEAR) {
+    var year = date.getFullYear() + Math.round(date.getMonth() / 12);
+    date.setFullYear(Math.round(year / this.step) * this.step);
+    date.setMonth(0);
+    date.setDate(0);
+    date.setHours(0);
+    date.setMinutes(0);
+    date.setSeconds(0);
+    date.setMilliseconds(0);
+  }
+  else if (this.scale == TimeStep.SCALE.MONTH) {
+    if (date.getDate() > 15) {
+      date.setDate(1);
+      date.setMonth(date.getMonth() + 1);
+      // important: first set Date to 1, after that change the month.
+    }
+    else {
+      date.setDate(1);
+    }
+
+    date.setHours(0);
+    date.setMinutes(0);
+    date.setSeconds(0);
+    date.setMilliseconds(0);
+  }
+  else if (this.scale == TimeStep.SCALE.DAY ||
+      this.scale == TimeStep.SCALE.WEEKDAY) {
+    //noinspection FallthroughInSwitchStatementJS
+    switch (this.step) {
+      case 5:
+      case 2:
+        date.setHours(Math.round(date.getHours() / 24) * 24); break;
+      default:
+        date.setHours(Math.round(date.getHours() / 12) * 12); break;
+    }
+    date.setMinutes(0);
+    date.setSeconds(0);
+    date.setMilliseconds(0);
+  }
+  else if (this.scale == TimeStep.SCALE.HOUR) {
+    switch (this.step) {
+      case 4:
+        date.setMinutes(Math.round(date.getMinutes() / 60) * 60); break;
+      default:
+        date.setMinutes(Math.round(date.getMinutes() / 30) * 30); break;
+    }
+    date.setSeconds(0);
+    date.setMilliseconds(0);
+  } else if (this.scale == TimeStep.SCALE.MINUTE) {
+    //noinspection FallthroughInSwitchStatementJS
+    switch (this.step) {
+      case 15:
+      case 10:
+        date.setMinutes(Math.round(date.getMinutes() / 5) * 5);
+        date.setSeconds(0);
+        break;
+      case 5:
+        date.setSeconds(Math.round(date.getSeconds() / 60) * 60); break;
+      default:
+        date.setSeconds(Math.round(date.getSeconds() / 30) * 30); break;
+    }
+    date.setMilliseconds(0);
+  }
+  else if (this.scale == TimeStep.SCALE.SECOND) {
+    //noinspection FallthroughInSwitchStatementJS
+    switch (this.step) {
+      case 15:
+      case 10:
+        date.setSeconds(Math.round(date.getSeconds() / 5) * 5);
+        date.setMilliseconds(0);
+        break;
+      case 5:
+        date.setMilliseconds(Math.round(date.getMilliseconds() / 1000) * 1000); break;
+      default:
+        date.setMilliseconds(Math.round(date.getMilliseconds() / 500) * 500); break;
+    }
+  }
+  else if (this.scale == TimeStep.SCALE.MILLISECOND) {
+    var step = this.step > 5 ? this.step / 2 : 1;
+    date.setMilliseconds(Math.round(date.getMilliseconds() / step) * step);
+  }
+};
+
+/**
+ * Check if the current value is a major value (for example when the step
+ * is DAY, a major value is each first day of the MONTH)
+ * @return {boolean} true if current date is major, else false.
+ */
+TimeStep.prototype.isMajor = function() {
+  switch (this.scale) {
+    case TimeStep.SCALE.MILLISECOND:
+      return (this.current.getMilliseconds() == 0);
+    case TimeStep.SCALE.SECOND:
+      return (this.current.getSeconds() == 0);
+    case TimeStep.SCALE.MINUTE:
+      return (this.current.getHours() == 0) && (this.current.getMinutes() == 0);
+    // Note: this is no bug. Major label is equal for both minute and hour scale
+    case TimeStep.SCALE.HOUR:
+      return (this.current.getHours() == 0);
+    case TimeStep.SCALE.WEEKDAY: // intentional fall through
+    case TimeStep.SCALE.DAY:
+      return (this.current.getDate() == 1);
+    case TimeStep.SCALE.MONTH:
+      return (this.current.getMonth() == 0);
+    case TimeStep.SCALE.YEAR:
+      return false;
+    default:
+      return false;
+  }
+};
+
+
+/**
+ * Returns formatted text for the minor axislabel, depending on the current
+ * date and the scale. For example when scale is MINUTE, the current time is
+ * formatted as "hh:mm".
+ * @param {Date} [date] custom date. if not provided, current date is taken
+ */
+TimeStep.prototype.getLabelMinor = function(date) {
+  if (date == undefined) {
+    date = this.current;
+  }
+
+  switch (this.scale) {
+    case TimeStep.SCALE.MILLISECOND:  return moment(date).format('SSS');
+    case TimeStep.SCALE.SECOND:       return moment(date).format('s');
+    case TimeStep.SCALE.MINUTE:       return moment(date).format('HH:mm');
+    case TimeStep.SCALE.HOUR:         return moment(date).format('HH:mm');
+    case TimeStep.SCALE.WEEKDAY:      return moment(date).format('ddd D');
+    case TimeStep.SCALE.DAY:          return moment(date).format('D');
+    case TimeStep.SCALE.MONTH:        return moment(date).format('MMM');
+    case TimeStep.SCALE.YEAR:         return moment(date).format('YYYY');
+    default:                          return '';
+  }
+};
+
+
+/**
+ * Returns formatted text for the major axis label, depending on the current
+ * date and the scale. For example when scale is MINUTE, the major scale is
+ * hours, and the hour will be formatted as "hh".
+ * @param {Date} [date] custom date. if not provided, current date is taken
+ */
+TimeStep.prototype.getLabelMajor = function(date) {
+  if (date == undefined) {
+    date = this.current;
+  }
+
+  //noinspection FallthroughInSwitchStatementJS
+  switch (this.scale) {
+    case TimeStep.SCALE.MILLISECOND:return moment(date).format('HH:mm:ss');
+    case TimeStep.SCALE.SECOND:     return moment(date).format('D MMMM HH:mm');
+    case TimeStep.SCALE.MINUTE:
+    case TimeStep.SCALE.HOUR:       return moment(date).format('ddd D MMMM');
+    case TimeStep.SCALE.WEEKDAY:
+    case TimeStep.SCALE.DAY:        return moment(date).format('MMMM YYYY');
+    case TimeStep.SCALE.MONTH:      return moment(date).format('YYYY');
+    case TimeStep.SCALE.YEAR:       return '';
+    default:                        return '';
+  }
+};
+
+/**
+ * @constructor Stack
+ * Stacks items on top of each other.
+ * @param {ItemSet} parent
+ * @param {Object} [options]
+ */
+function Stack (parent, options) {
+  this.parent = parent;
+
+  this.options = options || {};
+  this.defaultOptions = {
+    order: function (a, b) {
+      //return (b.width - a.width) || (a.left - b.left);  // TODO: cleanup
+      // Order: ranges over non-ranges, ranged ordered by width, and
+      // lastly ordered by start.
+      if (a instanceof ItemRange) {
+        if (b instanceof ItemRange) {
+          var aInt = (a.data.end - a.data.start);
+          var bInt = (b.data.end - b.data.start);
+          return (aInt - bInt) || (a.data.start - b.data.start);
+        }
+        else {
+          return -1;
+        }
+      }
+      else {
+        if (b instanceof ItemRange) {
+          return 1;
+        }
+        else {
+          return (a.data.start - b.data.start);
+        }
+      }
+    },
+    margin: {
+      item: 10
+    }
+  };
+
+  this.ordered = [];  // ordered items
+}
+
+/**
+ * Set options for the stack
+ * @param {Object} options  Available options:
+ *                          {ItemSet} parent
+ *                          {Number} margin
+ *                          {function} order  Stacking order
+ */
+Stack.prototype.setOptions = function setOptions (options) {
+  util.extend(this.options, options);
+
+  // TODO: register on data changes at the connected parent itemset, and update the changed part only and immediately
+};
+
+/**
+ * Stack the items such that they don't overlap. The items will have a minimal
+ * distance equal to options.margin.item.
+ */
+Stack.prototype.update = function update() {
+  this._order();
+  this._stack();
+};
+
+/**
+ * Order the items. The items are ordered by width first, and by left position
+ * second.
+ * If a custom order function has been provided via the options, then this will
+ * be used.
+ * @private
+ */
+Stack.prototype._order = function _order () {
+  var items = this.parent.items;
+  if (!items) {
+    throw new Error('Cannot stack items: parent does not contain items');
+  }
+
+  // TODO: store the sorted items, to have less work later on
+  var ordered = [];
+  var index = 0;
+  // items is a map (no array)
+  util.forEach(items, function (item) {
+    if (item.visible) {
+      ordered[index] = item;
+      index++;
+    }
+  });
+
+  //if a customer stack order function exists, use it.
+  var order = this.options.order || this.defaultOptions.order;
+  if (!(typeof order === 'function')) {
+    throw new Error('Option order must be a function');
+  }
+
+  ordered.sort(order);
+
+  this.ordered = ordered;
+};
+
+/**
+ * Adjust vertical positions of the events such that they don't overlap each
+ * other.
+ * @private
+ */
+Stack.prototype._stack = function _stack () {
+  var i,
+      iMax,
+      ordered = this.ordered,
+      options = this.options,
+      orientation = options.orientation || this.defaultOptions.orientation,
+      axisOnTop = (orientation == 'top'),
+      margin;
+
+  if (options.margin && options.margin.item !== undefined) {
+    margin = options.margin.item;
+  }
+  else {
+    margin = this.defaultOptions.margin.item
+  }
+
+  // calculate new, non-overlapping positions
+  for (i = 0, iMax = ordered.length; i < iMax; i++) {
+    var item = ordered[i];
+    var collidingItem = null;
+    do {
+      // TODO: optimize checking for overlap. when there is a gap without items,
+      //  you only need to check for items from the next item on, not from zero
+      collidingItem = this.checkOverlap(ordered, i, 0, i - 1, margin);
+      if (collidingItem != null) {
+        // There is a collision. Reposition the event above the colliding element
+        if (axisOnTop) {
+          item.top = collidingItem.top + collidingItem.height + margin;
+        }
+        else {
+          item.top = collidingItem.top - item.height - margin;
+        }
+      }
+    } while (collidingItem);
+  }
+};
+
+/**
+ * Check if the destiny position of given item overlaps with any
+ * of the other items from index itemStart to itemEnd.
+ * @param {Array} items     Array with items
+ * @param {int}  itemIndex  Number of the item to be checked for overlap
+ * @param {int}  itemStart  First item to be checked.
+ * @param {int}  itemEnd    Last item to be checked.
+ * @return {Object | null}  colliding item, or undefined when no collisions
+ * @param {Number} margin   A minimum required margin.
+ *                          If margin is provided, the two items will be
+ *                          marked colliding when they overlap or
+ *                          when the margin between the two is smaller than
+ *                          the requested margin.
+ */
+Stack.prototype.checkOverlap = function checkOverlap (items, itemIndex,
+                                                      itemStart, itemEnd, margin) {
+  var collision = this.collision;
+
+  // we loop from end to start, as we suppose that the chance of a
+  // collision is larger for items at the end, so check these first.
+  var a = items[itemIndex];
+  for (var i = itemEnd; i >= itemStart; i--) {
+    var b = items[i];
+    if (collision(a, b, margin)) {
+      if (i != itemIndex) {
+        return b;
+      }
+    }
+  }
+
+  return null;
+};
+
+/**
+ * Test if the two provided items collide
+ * The items must have parameters left, width, top, and height.
+ * @param {Component} a     The first item
+ * @param {Component} b     The second item
+ * @param {Number} margin   A minimum required margin.
+ *                          If margin is provided, the two items will be
+ *                          marked colliding when they overlap or
+ *                          when the margin between the two is smaller than
+ *                          the requested margin.
+ * @return {boolean}        true if a and b collide, else false
+ */
+Stack.prototype.collision = function collision (a, b, margin) {
+  return ((a.left - margin) < (b.left + b.getWidth()) &&
+      (a.left + a.getWidth() + margin) > b.left &&
+      (a.top - margin) < (b.top + b.height) &&
+      (a.top + a.height + margin) > b.top);
+};
+
+/**
+ * @constructor Range
+ * A Range controls a numeric range with a start and end value.
+ * The Range adjusts the range based on mouse events or programmatic changes,
+ * and triggers events when the range is changing or has been changed.
+ * @param {Object} [options]   See description at Range.setOptions
+ * @extends Controller
+ */
+function Range(options) {
+  this.id = util.randomUUID();
+  this.start = null; // Number
+  this.end = null;   // Number
+
+  this.options = options || {};
+
+  this.setOptions(options);
+}
+
+/**
+ * Set options for the range controller
+ * @param {Object} options      Available options:
+ *                              {Number} min    Minimum value for start
+ *                              {Number} max    Maximum value for end
+ *                              {Number} zoomMin    Set a minimum value for
+ *                                                  (end - start).
+ *                              {Number} zoomMax    Set a maximum value for
+ *                                                  (end - start).
+ */
+Range.prototype.setOptions = function (options) {
+  util.extend(this.options, options);
+
+  // re-apply range with new limitations
+  if (this.start !== null && this.end !== null) {
+    this.setRange(this.start, this.end);
+  }
+};
+
+/**
+ * Test whether direction has a valid value
+ * @param {String} direction    'horizontal' or 'vertical'
+ */
+function validateDirection (direction) {
+  if (direction != 'horizontal' && direction != 'vertical') {
+    throw new TypeError('Unknown direction "' + direction + '". ' +
+        'Choose "horizontal" or "vertical".');
+  }
+}
+
+/**
+ * Add listeners for mouse and touch events to the component
+ * @param {Component} component
+ * @param {String} event        Available events: 'move', 'zoom'
+ * @param {String} direction    Available directions: 'horizontal', 'vertical'
+ */
+Range.prototype.subscribe = function (component, event, direction) {
+  var me = this;
+
+  if (event == 'move') {
+    // drag start listener
+    component.on('dragstart', function (event) {
+      me._onDragStart(event, component);
+    });
+
+    // drag listener
+    component.on('drag', function (event) {
+      me._onDrag(event, component, direction);
+    });
+
+    // drag end listener
+    component.on('dragend', function (event) {
+      me._onDragEnd(event, component);
+    });
+  }
+  else if (event == 'zoom') {
+    // mouse wheel
+    function mousewheel (event) {
+      me._onMouseWheel(event, component, direction);
+    }
+    component.on('mousewheel', mousewheel);
+    component.on('DOMMouseScroll', mousewheel); // For FF
+
+    // pinch
+    component.on('touch', function (event) {
+      me._onTouch();
+    });
+    component.on('pinch', function (event) {
+      me._onPinch(event, component, direction);
+    });
+  }
+  else {
+    throw new TypeError('Unknown event "' + event + '". ' +
+        'Choose "move" or "zoom".');
+  }
+};
+
+/**
+ * Event handler
+ * @param {String} event       name of the event, for example 'click', 'mousemove'
+ * @param {function} callback  callback handler, invoked with the raw HTML Event
+ *                             as parameter.
+ */
+Range.prototype.on = function (event, callback) {
+  events.addListener(this, event, callback);
+};
+
+/**
+ * Trigger an event
+ * @param {String} event    name of the event, available events: 'rangechange',
+ *                          'rangechanged'
+ * @private
+ */
+Range.prototype._trigger = function (event) {
+  events.trigger(this, event, {
+    start: this.start,
+    end: this.end
+  });
+};
+
+/**
+ * Set a new start and end range
+ * @param {Number} [start]
+ * @param {Number} [end]
+ */
+Range.prototype.setRange = function(start, end) {
+  var changed = this._applyRange(start, end);
+  if (changed) {
+    this._trigger('rangechange');
+    this._trigger('rangechanged');
+  }
+};
+
+/**
+ * Set a new start and end range. This method is the same as setRange, but
+ * does not trigger a range change and range changed event, and it returns
+ * true when the range is changed
+ * @param {Number} [start]
+ * @param {Number} [end]
+ * @return {Boolean} changed
+ * @private
+ */
+Range.prototype._applyRange = function(start, end) {
+  var newStart = (start != null) ? util.convert(start, 'Number') : this.start,
+      newEnd   = (end != null)   ? util.convert(end, 'Number')   : this.end,
+      max = (this.options.max != null) ? util.convert(this.options.max, 'Date').valueOf() : null,
+      min = (this.options.min != null) ? util.convert(this.options.min, 'Date').valueOf() : null,
+      diff;
+
+  // check for valid number
+  if (isNaN(newStart) || newStart === null) {
+    throw new Error('Invalid start "' + start + '"');
+  }
+  if (isNaN(newEnd) || newEnd === null) {
+    throw new Error('Invalid end "' + end + '"');
+  }
+
+  // prevent start < end
+  if (newEnd < newStart) {
+    newEnd = newStart;
+  }
+
+  // prevent start < min
+  if (min !== null) {
+    if (newStart < min) {
+      diff = (min - newStart);
+      newStart += diff;
+      newEnd += diff;
+
+      // prevent end > max
+      if (max != null) {
+        if (newEnd > max) {
+          newEnd = max;
+        }
+      }
+    }
+  }
+
+  // prevent end > max
+  if (max !== null) {
+    if (newEnd > max) {
+      diff = (newEnd - max);
+      newStart -= diff;
+      newEnd -= diff;
+
+      // prevent start < min
+      if (min != null) {
+        if (newStart < min) {
+          newStart = min;
+        }
+      }
+    }
+  }
+
+  // prevent (end-start) < zoomMin
+  if (this.options.zoomMin !== null) {
+    var zoomMin = parseFloat(this.options.zoomMin);
+    if (zoomMin < 0) {
+      zoomMin = 0;
+    }
+    if ((newEnd - newStart) < zoomMin) {
+      if ((this.end - this.start) === zoomMin) {
+        // ignore this action, we are already zoomed to the minimum
+        newStart = this.start;
+        newEnd = this.end;
+      }
+      else {
+        // zoom to the minimum
+        diff = (zoomMin - (newEnd - newStart));
+        newStart -= diff / 2;
+        newEnd += diff / 2;
+      }
+    }
+  }
+
+  // prevent (end-start) > zoomMax
+  if (this.options.zoomMax !== null) {
+    var zoomMax = parseFloat(this.options.zoomMax);
+    if (zoomMax < 0) {
+      zoomMax = 0;
+    }
+    if ((newEnd - newStart) > zoomMax) {
+      if ((this.end - this.start) === zoomMax) {
+        // ignore this action, we are already zoomed to the maximum
+        newStart = this.start;
+        newEnd = this.end;
+      }
+      else {
+        // zoom to the maximum
+        diff = ((newEnd - newStart) - zoomMax);
+        newStart += diff / 2;
+        newEnd -= diff / 2;
+      }
+    }
+  }
+
+  var changed = (this.start != newStart || this.end != newEnd);
+
+  this.start = newStart;
+  this.end = newEnd;
+
+  return changed;
+};
+
+/**
+ * Retrieve the current range.
+ * @return {Object} An object with start and end properties
+ */
+Range.prototype.getRange = function() {
+  return {
+    start: this.start,
+    end: this.end
+  };
+};
+
+/**
+ * Calculate the conversion offset and scale for current range, based on
+ * the provided width
+ * @param {Number} width
+ * @returns {{offset: number, scale: number}} conversion
+ */
+Range.prototype.conversion = function (width) {
+  return Range.conversion(this.start, this.end, width);
+};
+
+/**
+ * Static method to calculate the conversion offset and scale for a range,
+ * based on the provided start, end, and width
+ * @param {Number} start
+ * @param {Number} end
+ * @param {Number} width
+ * @returns {{offset: number, scale: number}} conversion
+ */
+Range.conversion = function (start, end, width) {
+  if (width != 0 && (end - start != 0)) {
+    return {
+      offset: start,
+      scale: width / (end - start)
+    }
+  }
+  else {
+    return {
+      offset: 0,
+      scale: 1
+    };
+  }
+};
+
+// global (private) object to store drag params
+var touchParams = {};
+
+/**
+ * Start dragging horizontally or vertically
+ * @param {Event} event
+ * @param {Object} component
+ * @private
+ */
+Range.prototype._onDragStart = function(event, component) {
+  // refuse to drag when we where pinching to prevent the timeline make a jump
+  // when releasing the fingers in opposite order from the touch screen
+  if (touchParams.pinching) return;
+
+  touchParams.start = this.start;
+  touchParams.end = this.end;
+
+  var frame = component.frame;
+  if (frame) {
+    frame.style.cursor = 'move';
+  }
+};
+
+/**
+ * Perform dragging operating.
+ * @param {Event} event
+ * @param {Component} component
+ * @param {String} direction    'horizontal' or 'vertical'
+ * @private
+ */
+Range.prototype._onDrag = function (event, component, direction) {
+  validateDirection(direction);
+
+  // refuse to drag when we where pinching to prevent the timeline make a jump
+  // when releasing the fingers in opposite order from the touch screen
+  if (touchParams.pinching) return;
+
+  var delta = (direction == 'horizontal') ? event.gesture.deltaX : event.gesture.deltaY,
+      interval = (touchParams.end - touchParams.start),
+      width = (direction == 'horizontal') ? component.width : component.height,
+      diffRange = -delta / width * interval;
+
+  this._applyRange(touchParams.start + diffRange, touchParams.end + diffRange);
+
+  // fire a rangechange event
+  this._trigger('rangechange');
+};
+
+/**
+ * Stop dragging operating.
+ * @param {event} event
+ * @param {Component} component
+ * @private
+ */
+Range.prototype._onDragEnd = function (event, component) {
+  // refuse to drag when we where pinching to prevent the timeline make a jump
+  // when releasing the fingers in opposite order from the touch screen
+  if (touchParams.pinching) return;
+
+  if (component.frame) {
+    component.frame.style.cursor = 'auto';
+  }
+
+  // fire a rangechanged event
+  this._trigger('rangechanged');
+};
+
+/**
+ * Event handler for mouse wheel event, used to zoom
+ * Code from http://adomas.org/javascript-mouse-wheel/
+ * @param {Event} event
+ * @param {Component} component
+ * @param {String} direction    'horizontal' or 'vertical'
+ * @private
+ */
+Range.prototype._onMouseWheel = function(event, component, direction) {
+  validateDirection(direction);
+
+  // retrieve delta
+  var delta = 0;
+  if (event.wheelDelta) { /* IE/Opera. */
+    delta = event.wheelDelta / 120;
+  } else if (event.detail) { /* Mozilla case. */
+    // In Mozilla, sign of delta is different than in IE.
+    // Also, delta is multiple of 3.
+    delta = -event.detail / 3;
+  }
+
+  // If delta is nonzero, handle it.
+  // Basically, delta is now positive if wheel was scrolled up,
+  // and negative, if wheel was scrolled down.
+  if (delta) {
+    // perform the zoom action. Delta is normally 1 or -1
+
+    // adjust a negative delta such that zooming in with delta 0.1
+    // equals zooming out with a delta -0.1
+    var scale;
+    if (delta < 0) {
+      scale = 1 - (delta / 5);
+    }
+    else {
+      scale = 1 / (1 + (delta / 5)) ;
+    }
+
+    // calculate center, the date to zoom around
+    var gesture = util.fakeGesture(this, event),
+        pointer = getPointer(gesture.touches[0], component.frame),
+        pointerDate = this._pointerToDate(component, direction, pointer);
+
+    this.zoom(scale, pointerDate);
+  }
+
+  // Prevent default actions caused by mouse wheel
+  // (else the page and timeline both zoom and scroll)
+  util.preventDefault(event);
+};
+
+/**
+ * On start of a touch gesture, initialize scale to 1
+ * @private
+ */
+Range.prototype._onTouch = function () {
+  touchParams.start = this.start;
+  touchParams.end = this.end;
+  touchParams.pinching = false;
+  touchParams.center = null;
+};
+
+/**
+ * Handle pinch event
+ * @param {Event} event
+ * @param {Component} component
+ * @param {String} direction    'horizontal' or 'vertical'
+ * @private
+ */
+Range.prototype._onPinch = function (event, component, direction) {
+  touchParams.pinching = true;
+
+  if (event.gesture.touches.length > 1) {
+    if (!touchParams.center) {
+      touchParams.center = getPointer(event.gesture.center, component.frame);
+    }
+
+    var scale = 1 / event.gesture.scale,
+        initDate = this._pointerToDate(component, direction, touchParams.center),
+        center = getPointer(event.gesture.center, component.frame),
+        date = this._pointerToDate(component, direction, center),
+        delta = date - initDate; // TODO: utilize delta
+
+    // calculate new start and end
+    var newStart = parseInt(initDate + (touchParams.start - initDate) * scale);
+    var newEnd = parseInt(initDate + (touchParams.end - initDate) * scale);
+
+    // apply new range
+    this.setRange(newStart, newEnd);
+  }
+};
+
+/**
+ * Helper function to calculate the center date for zooming
+ * @param {Component} component
+ * @param {{x: Number, y: Number}} pointer
+ * @param {String} direction    'horizontal' or 'vertical'
+ * @return {number} date
+ * @private
+ */
+Range.prototype._pointerToDate = function (component, direction, pointer) {
+  var conversion;
+  if (direction == 'horizontal') {
+    var width = component.width;
+    conversion = this.conversion(width);
+    return pointer.x / conversion.scale + conversion.offset;
+  }
+  else {
+    var height = component.height;
+    conversion = this.conversion(height);
+    return pointer.y / conversion.scale + conversion.offset;
+  }
+};
+
+/**
+ * Get the pointer location relative to the location of the dom element
+ * @param {{pageX: Number, pageY: Number}} touch
+ * @param {Element} element   HTML DOM element
+ * @return {{x: Number, y: Number}} pointer
+ * @private
+ */
+function getPointer (touch, element) {
+  return {
+    x: touch.pageX - vis.util.getAbsoluteLeft(element),
+    y: touch.pageY - vis.util.getAbsoluteTop(element)
+  };
+}
+
+/**
+ * Zoom the range the given scale in or out. Start and end date will
+ * be adjusted, and the timeline will be redrawn. You can optionally give a
+ * date around which to zoom.
+ * For example, try scale = 0.9 or 1.1
+ * @param {Number} scale      Scaling factor. Values above 1 will zoom out,
+ *                            values below 1 will zoom in.
+ * @param {Number} [center]   Value representing a date around which will
+ *                            be zoomed.
+ */
+Range.prototype.zoom = function(scale, center) {
+  // if centerDate is not provided, take it half between start Date and end Date
+  if (center == null) {
+    center = (this.start + this.end) / 2;
+  }
+
+  // calculate new start and end
+  var newStart = center + (this.start - center) * scale;
+  var newEnd = center + (this.end - center) * scale;
+
+  this.setRange(newStart, newEnd);
+};
+
+/**
+ * Move the range with a given delta to the left or right. Start and end
+ * value will be adjusted. For example, try delta = 0.1 or -0.1
+ * @param {Number}  delta     Moving amount. Positive value will move right,
+ *                            negative value will move left
+ */
+Range.prototype.move = function(delta) {
+  // zoom start Date and end Date relative to the centerDate
+  var diff = (this.end - this.start);
+
+  // apply new values
+  var newStart = this.start + diff * delta;
+  var newEnd = this.end + diff * delta;
+
+  // TODO: reckon with min and max range
+
+  this.start = newStart;
+  this.end = newEnd;
+};
+
+/**
+ * Move the range to a new center point
+ * @param {Number} moveTo      New center point of the range
+ */
+Range.prototype.moveTo = function(moveTo) {
+  var center = (this.start + this.end) / 2;
+
+  var diff = center - moveTo;
+
+  // calculate new start and end
+  var newStart = this.start - diff;
+  var newEnd = this.end - diff;
+
+  this.setRange(newStart, newEnd);
+};
+
+/**
+ * @constructor Controller
+ *
+ * A Controller controls the reflows and repaints of all visual components
+ */
+function Controller () {
+  this.id = util.randomUUID();
+  this.components = {};
+
+  this.repaintTimer = undefined;
+  this.reflowTimer = undefined;
+}
+
+/**
+ * Add a component to the controller
+ * @param {Component} component
+ */
+Controller.prototype.add = function add(component) {
+  // validate the component
+  if (component.id == undefined) {
+    throw new Error('Component has no field id');
+  }
+  if (!(component instanceof Component) && !(component instanceof Controller)) {
+    throw new TypeError('Component must be an instance of ' +
+        'prototype Component or Controller');
+  }
+
+  // add the component
+  component.controller = this;
+  this.components[component.id] = component;
+};
+
+/**
+ * Remove a component from the controller
+ * @param {Component | String} component
+ */
+Controller.prototype.remove = function remove(component) {
+  var id;
+  for (id in this.components) {
+    if (this.components.hasOwnProperty(id)) {
+      if (id == component || this.components[id] == component) {
+        break;
+      }
+    }
+  }
+
+  if (id) {
+    delete this.components[id];
+  }
+};
+
+/**
+ * Request a reflow. The controller will schedule a reflow
+ * @param {Boolean} [force]     If true, an immediate reflow is forced. Default
+ *                              is false.
+ */
+Controller.prototype.requestReflow = function requestReflow(force) {
+  if (force) {
+    this.reflow();
+  }
+  else {
+    if (!this.reflowTimer) {
+      var me = this;
+      this.reflowTimer = setTimeout(function () {
+        me.reflowTimer = undefined;
+        me.reflow();
+      }, 0);
+    }
+  }
+};
+
+/**
+ * Request a repaint. The controller will schedule a repaint
+ * @param {Boolean} [force]    If true, an immediate repaint is forced. Default
+ *                             is false.
+ */
+Controller.prototype.requestRepaint = function requestRepaint(force) {
+  if (force) {
+    this.repaint();
+  }
+  else {
+    if (!this.repaintTimer) {
+      var me = this;
+      this.repaintTimer = setTimeout(function () {
+        me.repaintTimer = undefined;
+        me.repaint();
+      }, 0);
+    }
+  }
+};
+
+/**
+ * Repaint all components
+ */
+Controller.prototype.repaint = function repaint() {
+  var changed = false;
+
+  // cancel any running repaint request
+  if (this.repaintTimer) {
+    clearTimeout(this.repaintTimer);
+    this.repaintTimer = undefined;
+  }
+
+  var done = {};
+
+  function repaint(component, id) {
+    if (!(id in done)) {
+      // first repaint the components on which this component is dependent
+      if (component.depends) {
+        component.depends.forEach(function (dep) {
+          repaint(dep, dep.id);
+        });
+      }
+      if (component.parent) {
+        repaint(component.parent, component.parent.id);
+      }
+
+      // repaint the component itself and mark as done
+      changed = component.repaint() || changed;
+      done[id] = true;
+    }
+  }
+
+  util.forEach(this.components, repaint);
+
+  // immediately reflow when needed
+  if (changed) {
+    this.reflow();
+  }
+  // TODO: limit the number of nested reflows/repaints, prevent loop
+};
+
+/**
+ * Reflow all components
+ */
+Controller.prototype.reflow = function reflow() {
+  var resized = false;
+
+  // cancel any running repaint request
+  if (this.reflowTimer) {
+    clearTimeout(this.reflowTimer);
+    this.reflowTimer = undefined;
+  }
+
+  var done = {};
+
+  function reflow(component, id) {
+    if (!(id in done)) {
+      // first reflow the components on which this component is dependent
+      if (component.depends) {
+        component.depends.forEach(function (dep) {
+          reflow(dep, dep.id);
+        });
+      }
+      if (component.parent) {
+        reflow(component.parent, component.parent.id);
+      }
+
+      // reflow the component itself and mark as done
+      resized = component.reflow() || resized;
+      done[id] = true;
+    }
+  }
+
+  util.forEach(this.components, reflow);
+
+  // immediately repaint when needed
+  if (resized) {
+    this.repaint();
+  }
+  // TODO: limit the number of nested reflows/repaints, prevent loop
+};
+
+/**
+ * Prototype for visual components
+ */
+function Component () {
+  this.id = null;
+  this.parent = null;
+  this.depends = null;
+  this.controller = null;
+  this.options = null;
+
+  this.frame = null; // main DOM element
+  this.top = 0;
+  this.left = 0;
+  this.width = 0;
+  this.height = 0;
+}
+
+/**
+ * Set parameters for the frame. Parameters will be merged in current parameter
+ * set.
+ * @param {Object} options  Available parameters:
+ *                          {String | function} [className]
+ *                          {EventBus} [eventBus]
+ *                          {String | Number | function} [left]
+ *                          {String | Number | function} [top]
+ *                          {String | Number | function} [width]
+ *                          {String | Number | function} [height]
+ */
+Component.prototype.setOptions = function setOptions(options) {
+  if (options) {
+    util.extend(this.options, options);
+
+    if (this.controller) {
+      this.requestRepaint();
+      this.requestReflow();
+    }
+  }
+};
+
+/**
+ * Get an option value by name
+ * The function will first check this.options object, and else will check
+ * this.defaultOptions.
+ * @param {String} name
+ * @return {*} value
+ */
+Component.prototype.getOption = function getOption(name) {
+  var value;
+  if (this.options) {
+    value = this.options[name];
+  }
+  if (value === undefined && this.defaultOptions) {
+    value = this.defaultOptions[name];
+  }
+  return value;
+};
+
+/**
+ * Get the container element of the component, which can be used by a child to
+ * add its own widgets. Not all components do have a container for childs, in
+ * that case null is returned.
+ * @returns {HTMLElement | null} container
+ */
+// TODO: get rid of the getContainer and getFrame methods, provide these via the options
+Component.prototype.getContainer = function getContainer() {
+  // should be implemented by the component
+  return null;
+};
+
+/**
+ * Get the frame element of the component, the outer HTML DOM element.
+ * @returns {HTMLElement | null} frame
+ */
+Component.prototype.getFrame = function getFrame() {
+  return this.frame;
+};
+
+/**
+ * Repaint the component
+ * @return {Boolean} changed
+ */
+Component.prototype.repaint = function repaint() {
+  // should be implemented by the component
+  return false;
+};
+
+/**
+ * Reflow the component
+ * @return {Boolean} resized
+ */
+Component.prototype.reflow = function reflow() {
+  // should be implemented by the component
+  return false;
+};
+
+/**
+ * Hide the component from the DOM
+ * @return {Boolean} changed
+ */
+Component.prototype.hide = function hide() {
+  if (this.frame && this.frame.parentNode) {
+    this.frame.parentNode.removeChild(this.frame);
+    return true;
+  }
+  else {
+    return false;
+  }
+};
+
+/**
+ * Show the component in the DOM (when not already visible).
+ * A repaint will be executed when the component is not visible
+ * @return {Boolean} changed
+ */
+Component.prototype.show = function show() {
+  if (!this.frame || !this.frame.parentNode) {
+    return this.repaint();
+  }
+  else {
+    return false;
+  }
+};
+
+/**
+ * Request a repaint. The controller will schedule a repaint
+ */
+Component.prototype.requestRepaint = function requestRepaint() {
+  if (this.controller) {
+    this.controller.requestRepaint();
+  }
+  else {
+    throw new Error('Cannot request a repaint: no controller configured');
+    // TODO: just do a repaint when no parent is configured?
+  }
+};
+
+/**
+ * Request a reflow. The controller will schedule a reflow
+ */
+Component.prototype.requestReflow = function requestReflow() {
+  if (this.controller) {
+    this.controller.requestReflow();
+  }
+  else {
+    throw new Error('Cannot request a reflow: no controller configured');
+    // TODO: just do a reflow when no parent is configured?
+  }
+};
+
+/**
+ * A panel can contain components
+ * @param {Component} [parent]
+ * @param {Component[]} [depends]   Components on which this components depends
+ *                                  (except for the parent)
+ * @param {Object} [options]    Available parameters:
+ *                              {String | Number | function} [left]
+ *                              {String | Number | function} [top]
+ *                              {String | Number | function} [width]
+ *                              {String | Number | function} [height]
+ *                              {String | function} [className]
+ * @constructor Panel
+ * @extends Component
+ */
+function Panel(parent, depends, options) {
+  this.id = util.randomUUID();
+  this.parent = parent;
+  this.depends = depends;
+
+  this.options = options || {};
+}
+
+Panel.prototype = new Component();
+
+/**
+ * Set options. Will extend the current options.
+ * @param {Object} [options]    Available parameters:
+ *                              {String | function} [className]
+ *                              {String | Number | function} [left]
+ *                              {String | Number | function} [top]
+ *                              {String | Number | function} [width]
+ *                              {String | Number | function} [height]
+ */
+Panel.prototype.setOptions = Component.prototype.setOptions;
+
+/**
+ * Get the container element of the panel, which can be used by a child to
+ * add its own widgets.
+ * @returns {HTMLElement} container
+ */
+Panel.prototype.getContainer = function () {
+  return this.frame;
+};
+
+/**
+ * Repaint the component
+ * @return {Boolean} changed
+ */
+Panel.prototype.repaint = function () {
+  var changed = 0,
+      update = util.updateProperty,
+      asSize = util.option.asSize,
+      options = this.options,
+      frame = this.frame;
+  if (!frame) {
+    frame = document.createElement('div');
+    frame.className = 'panel';
+
+    var className = options.className;
+    if (className) {
+      if (typeof className == 'function') {
+        util.addClassName(frame, String(className()));
+      }
+      else {
+        util.addClassName(frame, String(className));
+      }
+    }
+
+    this.frame = frame;
+    changed += 1;
+  }
+  if (!frame.parentNode) {
+    if (!this.parent) {
+      throw new Error('Cannot repaint panel: no parent attached');
+    }
+    var parentContainer = this.parent.getContainer();
+    if (!parentContainer) {
+      throw new Error('Cannot repaint panel: parent has no container element');
+    }
+    parentContainer.appendChild(frame);
+    changed += 1;
+  }
+
+  changed += update(frame.style, 'top',    asSize(options.top, '0px'));
+  changed += update(frame.style, 'left',   asSize(options.left, '0px'));
+  changed += update(frame.style, 'width',  asSize(options.width, '100%'));
+  changed += update(frame.style, 'height', asSize(options.height, '100%'));
+
+  return (changed > 0);
+};
+
+/**
+ * Reflow the component
+ * @return {Boolean} resized
+ */
+Panel.prototype.reflow = function () {
+  var changed = 0,
+      update = util.updateProperty,
+      frame = this.frame;
+
+  if (frame) {
+    changed += update(this, 'top', frame.offsetTop);
+    changed += update(this, 'left', frame.offsetLeft);
+    changed += update(this, 'width', frame.offsetWidth);
+    changed += update(this, 'height', frame.offsetHeight);
+  }
+  else {
+    changed += 1;
+  }
+
+  return (changed > 0);
+};
+
+/**
+ * A root panel can hold components. The root panel must be initialized with
+ * a DOM element as container.
+ * @param {HTMLElement} container
+ * @param {Object} [options]    Available parameters: see RootPanel.setOptions.
+ * @constructor RootPanel
+ * @extends Panel
+ */
+function RootPanel(container, options) {
+  this.id = util.randomUUID();
+  this.container = container;
+
+  this.options = options || {};
+  this.defaultOptions = {
+    autoResize: true
+  };
+
+  this.listeners = {}; // event listeners
+}
+
+RootPanel.prototype = new Panel();
+
+/**
+ * Set options. Will extend the current options.
+ * @param {Object} [options]    Available parameters:
+ *                              {String | function} [className]
+ *                              {String | Number | function} [left]
+ *                              {String | Number | function} [top]
+ *                              {String | Number | function} [width]
+ *                              {String | Number | function} [height]
+ *                              {Boolean | function} [autoResize]
+ */
+RootPanel.prototype.setOptions = Component.prototype.setOptions;
+
+/**
+ * Repaint the component
+ * @return {Boolean} changed
+ */
+RootPanel.prototype.repaint = function () {
+  var changed = 0,
+      update = util.updateProperty,
+      asSize = util.option.asSize,
+      options = this.options,
+      frame = this.frame;
+
+  if (!frame) {
+    frame = document.createElement('div');
+
+    this.frame = frame;
+
+    changed += 1;
+  }
+  if (!frame.parentNode) {
+    if (!this.container) {
+      throw new Error('Cannot repaint root panel: no container attached');
+    }
+    this.container.appendChild(frame);
+    changed += 1;
+  }
+
+  frame.className = 'vis timeline rootpanel ' + options.orientation;
+  var className = options.className;
+  if (className) {
+    util.addClassName(frame, util.option.asString(className));
+  }
+
+  changed += update(frame.style, 'top',    asSize(options.top, '0px'));
+  changed += update(frame.style, 'left',   asSize(options.left, '0px'));
+  changed += update(frame.style, 'width',  asSize(options.width, '100%'));
+  changed += update(frame.style, 'height', asSize(options.height, '100%'));
+
+  this._updateEventEmitters();
+  this._updateWatch();
+
+  return (changed > 0);
+};
+
+/**
+ * Reflow the component
+ * @return {Boolean} resized
+ */
+RootPanel.prototype.reflow = function () {
+  var changed = 0,
+      update = util.updateProperty,
+      frame = this.frame;
+
+  if (frame) {
+    changed += update(this, 'top', frame.offsetTop);
+    changed += update(this, 'left', frame.offsetLeft);
+    changed += update(this, 'width', frame.offsetWidth);
+    changed += update(this, 'height', frame.offsetHeight);
+  }
+  else {
+    changed += 1;
+  }
+
+  return (changed > 0);
+};
+
+/**
+ * Update watching for resize, depending on the current option
+ * @private
+ */
+RootPanel.prototype._updateWatch = function () {
+  var autoResize = this.getOption('autoResize');
+  if (autoResize) {
+    this._watch();
+  }
+  else {
+    this._unwatch();
+  }
+};
+
+/**
+ * Watch for changes in the size of the frame. On resize, the Panel will
+ * automatically redraw itself.
+ * @private
+ */
+RootPanel.prototype._watch = function () {
+  var me = this;
+
+  this._unwatch();
+
+  var checkSize = function () {
+    var autoResize = me.getOption('autoResize');
+    if (!autoResize) {
+      // stop watching when the option autoResize is changed to false
+      me._unwatch();
+      return;
+    }
+
+    if (me.frame) {
+      // check whether the frame is resized
+      if ((me.frame.clientWidth != me.width) ||
+          (me.frame.clientHeight != me.height)) {
+        me.requestReflow();
+      }
+    }
+  };
+
+  // TODO: automatically cleanup the event listener when the frame is deleted
+  util.addEventListener(window, 'resize', checkSize);
+
+  this.watchTimer = setInterval(checkSize, 1000);
+};
+
+/**
+ * Stop watching for a resize of the frame.
+ * @private
+ */
+RootPanel.prototype._unwatch = function () {
+  if (this.watchTimer) {
+    clearInterval(this.watchTimer);
+    this.watchTimer = undefined;
+  }
+
+  // TODO: remove event listener on window.resize
+};
+
+/**
+ * Event handler
+ * @param {String} event       name of the event, for example 'click', 'mousemove'
+ * @param {function} callback  callback handler, invoked with the raw HTML Event
+ *                             as parameter.
+ */
+RootPanel.prototype.on = function (event, callback) {
+  // register the listener at this component
+  var arr = this.listeners[event];
+  if (!arr) {
+    arr = [];
+    this.listeners[event] = arr;
+  }
+  arr.push(callback);
+
+  this._updateEventEmitters();
+};
+
+/**
+ * Update the event listeners for all event emitters
+ * @private
+ */
+RootPanel.prototype._updateEventEmitters = function () {
+  if (this.listeners) {
+    var me = this;
+    util.forEach(this.listeners, function (listeners, event) {
+      if (!me.emitters) {
+        me.emitters = {};
+      }
+      if (!(event in me.emitters)) {
+        // create event
+        var frame = me.frame;
+        if (frame) {
+          //console.log('Created a listener for event ' + event + ' on component ' + me.id); // TODO: cleanup logging
+          var callback = function(event) {
+            listeners.forEach(function (listener) {
+              // TODO: filter on event target!
+              listener(event);
+            });
+          };
+          me.emitters[event] = callback;
+
+          if (!me.hammer) {
+            me.hammer = Hammer(frame, {
+              prevent_default: true
+            });
+          }
+          me.hammer.on(event, callback);
+        }
+      }
+    });
+
+    // TODO: be able to delete event listeners
+    // TODO: be able to move event listeners to a parent when available
+  }
+};
+
+/**
+ * A horizontal time axis
+ * @param {Component} parent
+ * @param {Component[]} [depends]   Components on which this components depends
+ *                                  (except for the parent)
+ * @param {Object} [options]        See TimeAxis.setOptions for the available
+ *                                  options.
+ * @constructor TimeAxis
+ * @extends Component
+ */
+function TimeAxis (parent, depends, options) {
+  this.id = util.randomUUID();
+  this.parent = parent;
+  this.depends = depends;
+
+  this.dom = {
+    majorLines: [],
+    majorTexts: [],
+    minorLines: [],
+    minorTexts: [],
+    redundant: {
+      majorLines: [],
+      majorTexts: [],
+      minorLines: [],
+      minorTexts: []
+    }
+  };
+  this.props = {
+    range: {
+      start: 0,
+      end: 0,
+      minimumStep: 0
+    },
+    lineTop: 0
+  };
+
+  this.options = options || {};
+  this.defaultOptions = {
+    orientation: 'bottom',  // supported: 'top', 'bottom'
+    // TODO: implement timeaxis orientations 'left' and 'right'
+    showMinorLabels: true,
+    showMajorLabels: true
+  };
+
+  this.conversion = null;
+  this.range = null;
+}
+
+TimeAxis.prototype = new Component();
+
+// TODO: comment options
+TimeAxis.prototype.setOptions = Component.prototype.setOptions;
+
+/**
+ * Set a range (start and end)
+ * @param {Range | Object} range  A Range or an object containing start and end.
+ */
+TimeAxis.prototype.setRange = function (range) {
+  if (!(range instanceof Range) && (!range || !range.start || !range.end)) {
+    throw new TypeError('Range must be an instance of Range, ' +
+        'or an object containing start and end.');
+  }
+  this.range = range;
+};
+
+/**
+ * Convert a position on screen (pixels) to a datetime
+ * @param {int}     x    Position on the screen in pixels
+ * @return {Date}   time The datetime the corresponds with given position x
+ */
+TimeAxis.prototype.toTime = function(x) {
+  var conversion = this.conversion;
+  return new Date(x / conversion.scale + conversion.offset);
+};
+
+/**
+ * Convert a datetime (Date object) into a position on the screen
+ * @param {Date}   time A date
+ * @return {int}   x    The position on the screen in pixels which corresponds
+ *                      with the given date.
+ * @private
+ */
+TimeAxis.prototype.toScreen = function(time) {
+  var conversion = this.conversion;
+  return (time.valueOf() - conversion.offset) * conversion.scale;
+};
+
+/**
+ * Repaint the component
+ * @return {Boolean} changed
+ */
+TimeAxis.prototype.repaint = function () {
+  var changed = 0,
+      update = util.updateProperty,
+      asSize = util.option.asSize,
+      options = this.options,
+      orientation = this.getOption('orientation'),
+      props = this.props,
+      step = this.step;
+
+  var frame = this.frame;
+  if (!frame) {
+    frame = document.createElement('div');
+    this.frame = frame;
+    changed += 1;
+  }
+  frame.className = 'axis';
+  // TODO: custom className?
+
+  if (!frame.parentNode) {
+    if (!this.parent) {
+      throw new Error('Cannot repaint time axis: no parent attached');
+    }
+    var parentContainer = this.parent.getContainer();
+    if (!parentContainer) {
+      throw new Error('Cannot repaint time axis: parent has no container element');
+    }
+    parentContainer.appendChild(frame);
+
+    changed += 1;
+  }
+
+  var parent = frame.parentNode;
+  if (parent) {
+    var beforeChild = frame.nextSibling;
+    parent.removeChild(frame); //  take frame offline while updating (is almost twice as fast)
+
+    var defaultTop = (orientation == 'bottom' && this.props.parentHeight && this.height) ?
+        (this.props.parentHeight - this.height) + 'px' :
+        '0px';
+    changed += update(frame.style, 'top', asSize(options.top, defaultTop));
+    changed += update(frame.style, 'left', asSize(options.left, '0px'));
+    changed += update(frame.style, 'width', asSize(options.width, '100%'));
+    changed += update(frame.style, 'height', asSize(options.height, this.height + 'px'));
+
+    // get characters width and height
+    this._repaintMeasureChars();
+
+    if (this.step) {
+      this._repaintStart();
+
+      step.first();
+      var xFirstMajorLabel = undefined;
+      var max = 0;
+      while (step.hasNext() && max < 1000) {
+        max++;
+        var cur = step.getCurrent(),
+            x = this.toScreen(cur),
+            isMajor = step.isMajor();
+
+        // TODO: lines must have a width, such that we can create css backgrounds
+
+        if (this.getOption('showMinorLabels')) {
+          this._repaintMinorText(x, step.getLabelMinor());
+        }
+
+        if (isMajor && this.getOption('showMajorLabels')) {
+          if (x > 0) {
+            if (xFirstMajorLabel == undefined) {
+              xFirstMajorLabel = x;
+            }
+            this._repaintMajorText(x, step.getLabelMajor());
+          }
+          this._repaintMajorLine(x);
+        }
+        else {
+          this._repaintMinorLine(x);
+        }
+
+        step.next();
+      }
+
+      // create a major label on the left when needed
+      if (this.getOption('showMajorLabels')) {
+        var leftTime = this.toTime(0),
+            leftText = step.getLabelMajor(leftTime),
+            widthText = leftText.length * (props.majorCharWidth || 10) + 10; // upper bound estimation
+
+        if (xFirstMajorLabel == undefined || widthText < xFirstMajorLabel) {
+          this._repaintMajorText(0, leftText);
+        }
+      }
+
+      this._repaintEnd();
+    }
+
+    this._repaintLine();
+
+    // put frame online again
+    if (beforeChild) {
+      parent.insertBefore(frame, beforeChild);
+    }
+    else {
+      parent.appendChild(frame)
+    }
+  }
+
+  return (changed > 0);
+};
+
+/**
+ * Start a repaint. Move all DOM elements to a redundant list, where they
+ * can be picked for re-use, or can be cleaned up in the end
+ * @private
+ */
+TimeAxis.prototype._repaintStart = function () {
+  var dom = this.dom,
+      redundant = dom.redundant;
+
+  redundant.majorLines = dom.majorLines;
+  redundant.majorTexts = dom.majorTexts;
+  redundant.minorLines = dom.minorLines;
+  redundant.minorTexts = dom.minorTexts;
+
+  dom.majorLines = [];
+  dom.majorTexts = [];
+  dom.minorLines = [];
+  dom.minorTexts = [];
+};
+
+/**
+ * End a repaint. Cleanup leftover DOM elements in the redundant list
+ * @private
+ */
+TimeAxis.prototype._repaintEnd = function () {
+  util.forEach(this.dom.redundant, function (arr) {
+    while (arr.length) {
+      var elem = arr.pop();
+      if (elem && elem.parentNode) {
+        elem.parentNode.removeChild(elem);
+      }
+    }
+  });
+};
+
+
+/**
+ * Create a minor label for the axis at position x
+ * @param {Number} x
+ * @param {String} text
+ * @private
+ */
+TimeAxis.prototype._repaintMinorText = function (x, text) {
+  // reuse redundant label
+  var label = this.dom.redundant.minorTexts.shift();
+
+  if (!label) {
+    // create new label
+    var content = document.createTextNode('');
+    label = document.createElement('div');
+    label.appendChild(content);
+    label.className = 'text minor';
+    this.frame.appendChild(label);
+  }
+  this.dom.minorTexts.push(label);
+
+  label.childNodes[0].nodeValue = text;
+  label.style.left = x + 'px';
+  label.style.top  = this.props.minorLabelTop + 'px';
+  //label.title = title;  // TODO: this is a heavy operation
+};
+
+/**
+ * Create a Major label for the axis at position x
+ * @param {Number} x
+ * @param {String} text
+ * @private
+ */
+TimeAxis.prototype._repaintMajorText = function (x, text) {
+  // reuse redundant label
+  var label = this.dom.redundant.majorTexts.shift();
+
+  if (!label) {
+    // create label
+    var content = document.createTextNode(text);
+    label = document.createElement('div');
+    label.className = 'text major';
+    label.appendChild(content);
+    this.frame.appendChild(label);
+  }
+  this.dom.majorTexts.push(label);
+
+  label.childNodes[0].nodeValue = text;
+  label.style.top = this.props.majorLabelTop + 'px';
+  label.style.left = x + 'px';
+  //label.title = title; // TODO: this is a heavy operation
+};
+
+/**
+ * Create a minor line for the axis at position x
+ * @param {Number} x
+ * @private
+ */
+TimeAxis.prototype._repaintMinorLine = function (x) {
+  // reuse redundant line
+  var line = this.dom.redundant.minorLines.shift();
+
+  if (!line) {
+    // create vertical line
+    line = document.createElement('div');
+    line.className = 'grid vertical minor';
+    this.frame.appendChild(line);
+  }
+  this.dom.minorLines.push(line);
+
+  var props = this.props;
+  line.style.top = props.minorLineTop + 'px';
+  line.style.height = props.minorLineHeight + 'px';
+  line.style.left = (x - props.minorLineWidth / 2) + 'px';
+};
+
+/**
+ * Create a Major line for the axis at position x
+ * @param {Number} x
+ * @private
+ */
+TimeAxis.prototype._repaintMajorLine = function (x) {
+  // reuse redundant line
+  var line = this.dom.redundant.majorLines.shift();
+
+  if (!line) {
+    // create vertical line
+    line = document.createElement('DIV');
+    line.className = 'grid vertical major';
+    this.frame.appendChild(line);
+  }
+  this.dom.majorLines.push(line);
+
+  var props = this.props;
+  line.style.top = props.majorLineTop + 'px';
+  line.style.left = (x - props.majorLineWidth / 2) + 'px';
+  line.style.height = props.majorLineHeight + 'px';
+};
+
+
+/**
+ * Repaint the horizontal line for the axis
+ * @private
+ */
+TimeAxis.prototype._repaintLine = function() {
+  var line = this.dom.line,
+      frame = this.frame,
+      options = this.options;
+
+  // line before all axis elements
+  if (this.getOption('showMinorLabels') || this.getOption('showMajorLabels')) {
+    if (line) {
+      // put this line at the end of all childs
+      frame.removeChild(line);
+      frame.appendChild(line);
+    }
+    else {
+      // create the axis line
+      line = document.createElement('div');
+      line.className = 'grid horizontal major';
+      frame.appendChild(line);
+      this.dom.line = line;
+    }
+
+    line.style.top = this.props.lineTop + 'px';
+  }
+  else {
+    if (line && line.parentElement) {
+      frame.removeChild(line.line);
+      delete this.dom.line;
+    }
+  }
+};
+
+/**
+ * Create characters used to determine the size of text on the axis
+ * @private
+ */
+TimeAxis.prototype._repaintMeasureChars = function () {
+  // calculate the width and height of a single character
+  // this is used to calculate the step size, and also the positioning of the
+  // axis
+  var dom = this.dom,
+      text;
+
+  if (!dom.measureCharMinor) {
+    text = document.createTextNode('0');
+    var measureCharMinor = document.createElement('DIV');
+    measureCharMinor.className = 'text minor measure';
+    measureCharMinor.appendChild(text);
+    this.frame.appendChild(measureCharMinor);
+
+    dom.measureCharMinor = measureCharMinor;
+  }
+
+  if (!dom.measureCharMajor) {
+    text = document.createTextNode('0');
+    var measureCharMajor = document.createElement('DIV');
+    measureCharMajor.className = 'text major measure';
+    measureCharMajor.appendChild(text);
+    this.frame.appendChild(measureCharMajor);
+
+    dom.measureCharMajor = measureCharMajor;
+  }
+};
+
+/**
+ * Reflow the component
+ * @return {Boolean} resized
+ */
+TimeAxis.prototype.reflow = function () {
+  var changed = 0,
+      update = util.updateProperty,
+      frame = this.frame,
+      range = this.range;
+
+  if (!range) {
+    throw new Error('Cannot repaint time axis: no range configured');
+  }
+
+  if (frame) {
+    changed += update(this, 'top', frame.offsetTop);
+    changed += update(this, 'left', frame.offsetLeft);
+
+    // calculate size of a character
+    var props = this.props,
+        showMinorLabels = this.getOption('showMinorLabels'),
+        showMajorLabels = this.getOption('showMajorLabels'),
+        measureCharMinor = this.dom.measureCharMinor,
+        measureCharMajor = this.dom.measureCharMajor;
+    if (measureCharMinor) {
+      props.minorCharHeight = measureCharMinor.clientHeight;
+      props.minorCharWidth = measureCharMinor.clientWidth;
+    }
+    if (measureCharMajor) {
+      props.majorCharHeight = measureCharMajor.clientHeight;
+      props.majorCharWidth = measureCharMajor.clientWidth;
+    }
+
+    var parentHeight = frame.parentNode ? frame.parentNode.offsetHeight : 0;
+    if (parentHeight != props.parentHeight) {
+      props.parentHeight = parentHeight;
+      changed += 1;
+    }
+    switch (this.getOption('orientation')) {
+      case 'bottom':
+        props.minorLabelHeight = showMinorLabels ? props.minorCharHeight : 0;
+        props.majorLabelHeight = showMajorLabels ? props.majorCharHeight : 0;
+
+        props.minorLabelTop = 0;
+        props.majorLabelTop = props.minorLabelTop + props.minorLabelHeight;
+
+        props.minorLineTop = -this.top;
+        props.minorLineHeight = Math.max(this.top + props.majorLabelHeight, 0);
+        props.minorLineWidth = 1; // TODO: really calculate width
+
+        props.majorLineTop = -this.top;
+        props.majorLineHeight = Math.max(this.top + props.minorLabelHeight + props.majorLabelHeight, 0);
+        props.majorLineWidth = 1; // TODO: really calculate width
+
+        props.lineTop = 0;
+
+        break;
+
+      case 'top':
+        props.minorLabelHeight = showMinorLabels ? props.minorCharHeight : 0;
+        props.majorLabelHeight = showMajorLabels ? props.majorCharHeight : 0;
+
+        props.majorLabelTop = 0;
+        props.minorLabelTop = props.majorLabelTop + props.majorLabelHeight;
+
+        props.minorLineTop = props.minorLabelTop;
+        props.minorLineHeight = Math.max(parentHeight - props.majorLabelHeight - this.top);
+        props.minorLineWidth = 1; // TODO: really calculate width
+
+        props.majorLineTop = 0;
+        props.majorLineHeight = Math.max(parentHeight - this.top);
+        props.majorLineWidth = 1; // TODO: really calculate width
+
+        props.lineTop = props.majorLabelHeight +  props.minorLabelHeight;
+
+        break;
+
+      default:
+        throw new Error('Unkown orientation "' + this.getOption('orientation') + '"');
+    }
+
+    var height = props.minorLabelHeight + props.majorLabelHeight;
+    changed += update(this, 'width', frame.offsetWidth);
+    changed += update(this, 'height', height);
+
+    // calculate range and step
+    this._updateConversion();
+
+    var start = util.convert(range.start, 'Number'),
+        end = util.convert(range.end, 'Number'),
+        minimumStep = this.toTime((props.minorCharWidth || 10) * 5).valueOf()
+            -this.toTime(0).valueOf();
+    this.step = new TimeStep(new Date(start), new Date(end), minimumStep);
+    changed += update(props.range, 'start', start);
+    changed += update(props.range, 'end', end);
+    changed += update(props.range, 'minimumStep', minimumStep.valueOf());
+  }
+
+  return (changed > 0);
+};
+
+/**
+ * Calculate the scale and offset to convert a position on screen to the
+ * corresponding date and vice versa.
+ * After the method _updateConversion is executed once, the methods toTime
+ * and toScreen can be used.
+ * @private
+ */
+TimeAxis.prototype._updateConversion = function() {
+  var range = this.range;
+  if (!range) {
+    throw new Error('No range configured');
+  }
+
+  if (range.conversion) {
+    this.conversion = range.conversion(this.width);
+  }
+  else {
+    this.conversion = Range.conversion(range.start, range.end, this.width);
+  }
+};
+
+/**
+ * A current time bar
+ * @param {Component} parent
+ * @param {Component[]} [depends]   Components on which this components depends
+ *                                  (except for the parent)
+ * @param {Object} [options]        Available parameters:
+ *                                  {Boolean} [showCurrentTime]
+ * @constructor CurrentTime
+ * @extends Component
+ */
+
+function CurrentTime (parent, depends, options) {
+  this.id = util.randomUUID();
+  this.parent = parent;
+  this.depends = depends;
+
+  this.options = options || {};
+  this.defaultOptions = {
+    showCurrentTime: false
+  };
+}
+
+CurrentTime.prototype = new Component();
+
+CurrentTime.prototype.setOptions = Component.prototype.setOptions;
+
+/**
+ * Get the container element of the bar, which can be used by a child to
+ * add its own widgets.
+ * @returns {HTMLElement} container
+ */
+CurrentTime.prototype.getContainer = function () {
+  return this.frame;
+};
+
+/**
+ * Repaint the component
+ * @return {Boolean} changed
+ */
+CurrentTime.prototype.repaint = function () {
+  var bar = this.frame,
+      parent = this.parent,
+      parentContainer = parent.parent.getContainer();
+
+  if (!parent) {
+    throw new Error('Cannot repaint bar: no parent attached');
+  }
+
+  if (!parentContainer) {
+    throw new Error('Cannot repaint bar: parent has no container element');
+  }
+
+  if (!this.getOption('showCurrentTime')) {
+    if (bar) {
+      parentContainer.removeChild(bar);
+      delete this.frame;
+    }
+
+    return;
+  }
+
+  if (!bar) {
+    bar = document.createElement('div');
+    bar.className = 'currenttime';
+    bar.style.position = 'absolute';
+    bar.style.top = '0px';
+    bar.style.height = '100%';
+
+    parentContainer.appendChild(bar);
+    this.frame = bar;
+  }
+
+  if (!parent.conversion) {
+    parent._updateConversion();
+  }
+
+  var now = new Date();
+  var x = parent.toScreen(now);
+
+  bar.style.left = x + 'px';
+  bar.title = 'Current time: ' + now;
+
+  // start a timer to adjust for the new time
+  if (this.currentTimeTimer !== undefined) {
+    clearTimeout(this.currentTimeTimer);
+    delete this.currentTimeTimer;
+  }
+
+  var timeline = this;
+  var interval = 1 / parent.conversion.scale / 2;
+
+  if (interval < 30) {
+    interval = 30;
+  }
+
+  this.currentTimeTimer = setTimeout(function() {
+    timeline.repaint();
+  }, interval);
+
+  return false;
+};
+
+/**
+ * A custom time bar
+ * @param {Component} parent
+ * @param {Component[]} [depends]   Components on which this components depends
+ *                                  (except for the parent)
+ * @param {Object} [options]        Available parameters:
+ *                                  {Boolean} [showCustomTime]
+ * @constructor CustomTime
+ * @extends Component
+ */
+
+function CustomTime (parent, depends, options) {
+  this.id = util.randomUUID();
+  this.parent = parent;
+  this.depends = depends;
+
+  this.options = options || {};
+  this.defaultOptions = {
+    showCustomTime: false
+  };
+
+  this.listeners = [];
+  this.customTime = new Date();
+}
+
+CustomTime.prototype = new Component();
+
+CustomTime.prototype.setOptions = Component.prototype.setOptions;
+
+/**
+ * Get the container element of the bar, which can be used by a child to
+ * add its own widgets.
+ * @returns {HTMLElement} container
+ */
+CustomTime.prototype.getContainer = function () {
+  return this.frame;
+};
+
+/**
+ * Repaint the component
+ * @return {Boolean} changed
+ */
+CustomTime.prototype.repaint = function () {
+  var bar = this.frame,
+      parent = this.parent,
+      parentContainer = parent.parent.getContainer();
+
+  if (!parent) {
+    throw new Error('Cannot repaint bar: no parent attached');
+  }
+
+  if (!parentContainer) {
+    throw new Error('Cannot repaint bar: parent has no container element');
+  }
+
+  if (!this.getOption('showCustomTime')) {
+    if (bar) {
+      parentContainer.removeChild(bar);
+      delete this.frame;
+    }
+
+    return;
+  }
+
+  if (!bar) {
+    bar = document.createElement('div');
+    bar.className = 'customtime';
+    bar.style.position = 'absolute';
+    bar.style.top = '0px';
+    bar.style.height = '100%';
+
+    parentContainer.appendChild(bar);
+
+    var drag = document.createElement('div');
+    drag.style.position = 'relative';
+    drag.style.top = '0px';
+    drag.style.left = '-10px';
+    drag.style.height = '100%';
+    drag.style.width = '20px';
+    bar.appendChild(drag);
+
+    this.frame = bar;
+
+    this.subscribe(this, 'movetime');
+  }
+
+  if (!parent.conversion) {
+    parent._updateConversion();
+  }
+
+  var x = parent.toScreen(this.customTime);
+
+  bar.style.left = x + 'px';
+  bar.title = 'Time: ' + this.customTime;
+
+  return false;
+};
+
+/**
+ * Set custom time.
+ * @param {Date} time
+ */
+CustomTime.prototype._setCustomTime = function(time) {
+  this.customTime = new Date(time.valueOf());
+  this.repaint();
+};
+
+/**
+ * Retrieve the current custom time.
+ * @return {Date} customTime
+ */
+CustomTime.prototype._getCustomTime = function() {
+  return new Date(this.customTime.valueOf());
+};
+
+/**
+ * Add listeners for mouse and touch events to the component
+ * @param {Component} component
+ */
+CustomTime.prototype.subscribe = function (component, event) {
+  var me = this;
+  var listener = {
+    component: component,
+    event: event,
+    callback: function (event) {
+      me._onMouseDown(event, listener);
+    },
+    params: {}
+  };
+
+  component.on('mousedown', listener.callback);
+  me.listeners.push(listener);
+
+};
+
+/**
+ * Event handler
+ * @param {String} event       name of the event, for example 'click', 'mousemove'
+ * @param {function} callback  callback handler, invoked with the raw HTML Event
+ *                             as parameter.
+ */
+CustomTime.prototype.on = function (event, callback) {
+  var bar = this.frame;
+  if (!bar) {
+    throw new Error('Cannot add event listener: no parent attached');
+  }
+
+  events.addListener(this, event, callback);
+  util.addEventListener(bar, event, callback);
+};
+
+/**
+ * Start moving horizontally
+ * @param {Event} event
+ * @param {Object} listener   Listener containing the component and params
+ * @private
+ */
+CustomTime.prototype._onMouseDown = function(event, listener) {
+  event = event || window.event;
+  var params = listener.params;
+
+  // only react on left mouse button down
+  var leftButtonDown = event.which ? (event.which == 1) : (event.button == 1);
+  if (!leftButtonDown) {
+    return;
+  }
+
+  // get mouse position
+  params.mouseX = util.getPageX(event);
+  params.moved = false;
+
+  params.customTime = this.customTime;
+
+  // add event listeners to handle moving the custom time bar
+  var me = this;
+  if (!params.onMouseMove) {
+    params.onMouseMove = function (event) {
+      me._onMouseMove(event, listener);
+    };
+    util.addEventListener(document, 'mousemove', params.onMouseMove);
+  }
+  if (!params.onMouseUp) {
+    params.onMouseUp = function (event) {
+      me._onMouseUp(event, listener);
+    };
+    util.addEventListener(document, 'mouseup', params.onMouseUp);
+  }
+
+  util.stopPropagation(event);
+  util.preventDefault(event);
+};
+
+/**
+ * Perform moving operating.
+ * This function activated from within the funcion CustomTime._onMouseDown().
+ * @param {Event} event
+ * @param {Object} listener
+ * @private
+ */
+CustomTime.prototype._onMouseMove = function (event, listener) {
+  event = event || window.event;
+  var params = listener.params;
+  var parent = this.parent;
+
+  // calculate change in mouse position
+  var mouseX = util.getPageX(event);
+
+  if (params.mouseX === undefined) {
+    params.mouseX = mouseX;
+  }
+
+  var diff = mouseX - params.mouseX;
+
+  // if mouse movement is big enough, register it as a "moved" event
+  if (Math.abs(diff) >= 1) {
+    params.moved = true;
+  }
+
+  var x = parent.toScreen(params.customTime);
+  var xnew = x + diff;
+  var time = parent.toTime(xnew);
+  this._setCustomTime(time);
+
+  // fire a timechange event
+  events.trigger(this, 'timechange', {customTime: this.customTime});
+
+  util.preventDefault(event);
+};
+
+/**
+ * Stop moving operating.
+ * This function activated from within the function CustomTime._onMouseDown().
+ * @param {event} event
+ * @param {Object} listener
+ * @private
+ */
+CustomTime.prototype._onMouseUp = function (event, listener) {
+  event = event || window.event;
+  var params = listener.params;
+
+  // remove event listeners here, important for Safari
+  if (params.onMouseMove) {
+    util.removeEventListener(document, 'mousemove', params.onMouseMove);
+    params.onMouseMove = null;
+  }
+  if (params.onMouseUp) {
+    util.removeEventListener(document, 'mouseup', params.onMouseUp);
+    params.onMouseUp = null;
+  }
+
+  if (params.moved) {
+    // fire a timechanged event
+    events.trigger(this, 'timechanged', {customTime: this.customTime});
+  }
+};
+
+/**
+ * An ItemSet holds a set of items and ranges which can be displayed in a
+ * range. The width is determined by the parent of the ItemSet, and the height
+ * is determined by the size of the items.
+ * @param {Component} parent
+ * @param {Component[]} [depends]   Components on which this components depends
+ *                                  (except for the parent)
+ * @param {Object} [options]        See ItemSet.setOptions for the available
+ *                                  options.
+ * @constructor ItemSet
+ * @extends Panel
+ */
+// TODO: improve performance by replacing all Array.forEach with a for loop
+function ItemSet(parent, depends, options) {
+  this.id = util.randomUUID();
+  this.parent = parent;
+  this.depends = depends;
+
+  // one options object is shared by this itemset and all its items
+  this.options = options || {};
+  this.defaultOptions = {
+    type: 'box',
+    align: 'center',
+    orientation: 'bottom',
+    margin: {
+      axis: 20,
+      item: 10
+    },
+    padding: 5
+  };
+
+  this.dom = {};
+
+  var me = this;
+  this.itemsData = null;  // DataSet
+  this.range = null;      // Range or Object {start: number, end: number}
+
+  this.listeners = {
+    'add': function (event, params, senderId) {
+      if (senderId != me.id) {
+        me._onAdd(params.items);
+      }
+    },
+    'update': function (event, params, senderId) {
+      if (senderId != me.id) {
+        me._onUpdate(params.items);
+      }
+    },
+    'remove': function (event, params, senderId) {
+      if (senderId != me.id) {
+        me._onRemove(params.items);
+      }
+    }
+  };
+
+  this.items = {};    // object with an Item for every data item
+  this.queue = {};       // queue with id/actions: 'add', 'update', 'delete'
+  this.stack = new Stack(this, Object.create(this.options));
+  this.conversion = null;
+
+  // TODO: ItemSet should also attach event listeners for rangechange and rangechanged, like timeaxis
+}
+
+ItemSet.prototype = new Panel();
+
+// available item types will be registered here
+ItemSet.types = {
+  box: ItemBox,
+  range: ItemRange,
+  rangeoverflow: ItemRangeOverflow,
+  point: ItemPoint
+};
+
+/**
+ * Set options for the ItemSet. Existing options will be extended/overwritten.
+ * @param {Object} [options] The following options are available:
+ *                           {String | function} [className]
+ *                              class name for the itemset
+ *                           {String} [type]
+ *                              Default type for the items. Choose from 'box'
+ *                              (default), 'point', or 'range'. The default
+ *                              Style can be overwritten by individual items.
+ *                           {String} align
+ *                              Alignment for the items, only applicable for
+ *                              ItemBox. Choose 'center' (default), 'left', or
+ *                              'right'.
+ *                           {String} orientation
+ *                              Orientation of the item set. Choose 'top' or
+ *                              'bottom' (default).
+ *                           {Number} margin.axis
+ *                              Margin between the axis and the items in pixels.
+ *                              Default is 20.
+ *                           {Number} margin.item
+ *                              Margin between items in pixels. Default is 10.
+ *                           {Number} padding
+ *                              Padding of the contents of an item in pixels.
+ *                              Must correspond with the items css. Default is 5.
+ */
+ItemSet.prototype.setOptions = Component.prototype.setOptions;
+
+/**
+ * Set range (start and end).
+ * @param {Range | Object} range  A Range or an object containing start and end.
+ */
+ItemSet.prototype.setRange = function setRange(range) {
+  if (!(range instanceof Range) && (!range || !range.start || !range.end)) {
+    throw new TypeError('Range must be an instance of Range, ' +
+        'or an object containing start and end.');
+  }
+  this.range = range;
+};
+
+/**
+ * Repaint the component
+ * @return {Boolean} changed
+ */
+ItemSet.prototype.repaint = function repaint() {
+  var changed = 0,
+      update = util.updateProperty,
+      asSize = util.option.asSize,
+      options = this.options,
+      orientation = this.getOption('orientation'),
+      defaultOptions = this.defaultOptions,
+      frame = this.frame;
+
+  if (!frame) {
+    frame = document.createElement('div');
+    frame.className = 'itemset';
+
+    var className = options.className;
+    if (className) {
+      util.addClassName(frame, util.option.asString(className));
+    }
+
+    // create background panel
+    var background = document.createElement('div');
+    background.className = 'background';
+    frame.appendChild(background);
+    this.dom.background = background;
+
+    // create foreground panel
+    var foreground = document.createElement('div');
+    foreground.className = 'foreground';
+    frame.appendChild(foreground);
+    this.dom.foreground = foreground;
+
+    // create axis panel
+    var axis = document.createElement('div');
+    axis.className = 'itemset-axis';
+    //frame.appendChild(axis);
+    this.dom.axis = axis;
+
+    this.frame = frame;
+    changed += 1;
+  }
+
+  if (!this.parent) {
+    throw new Error('Cannot repaint itemset: no parent attached');
+  }
+  var parentContainer = this.parent.getContainer();
+  if (!parentContainer) {
+    throw new Error('Cannot repaint itemset: parent has no container element');
+  }
+  if (!frame.parentNode) {
+    parentContainer.appendChild(frame);
+    changed += 1;
+  }
+  if (!this.dom.axis.parentNode) {
+    parentContainer.appendChild(this.dom.axis);
+    changed += 1;
+  }
+
+  // reposition frame
+  changed += update(frame.style, 'left',   asSize(options.left, '0px'));
+  changed += update(frame.style, 'top',    asSize(options.top, '0px'));
+  changed += update(frame.style, 'width',  asSize(options.width, '100%'));
+  changed += update(frame.style, 'height', asSize(options.height, this.height + 'px'));
+
+  // reposition axis
+  changed += update(this.dom.axis.style, 'left', asSize(options.left, '0px'));
+  changed += update(this.dom.axis.style, 'width',  asSize(options.width, '100%'));
+  if (orientation == 'bottom') {
+    changed += update(this.dom.axis.style, 'top',  (this.height + this.top) + 'px');
+  }
+  else { // orientation == 'top'
+    changed += update(this.dom.axis.style, 'top', this.top + 'px');
+  }
+
+  this._updateConversion();
+
+  var me = this,
+      queue = this.queue,
+      itemsData = this.itemsData,
+      items = this.items,
+      dataOptions = {
+        // TODO: cleanup
+        // fields: [(itemsData && itemsData.fieldId || 'id'), 'start', 'end', 'content', 'type', 'className']
+      };
+
+  // show/hide added/changed/removed items
+  Object.keys(queue).forEach(function (id) {
+    //var entry = queue[id];
+    var action = queue[id];
+    var item = items[id];
+    //var item = entry.item;
+    //noinspection FallthroughInSwitchStatementJS
+    switch (action) {
+      case 'add':
+      case 'update':
+        var itemData = itemsData && itemsData.get(id, dataOptions);
+
+        if (itemData) {
+          var type = itemData.type ||
+              (itemData.start && itemData.end && 'range') ||
+              options.type ||
+              'box';
+          var constructor = ItemSet.types[type];
+
+          // TODO: how to handle items with invalid data? hide them and give a warning? or throw an error?
+          if (item) {
+            // update item
+            if (!constructor || !(item instanceof constructor)) {
+              // item type has changed, hide and delete the item
+              changed += item.hide();
+              item = null;
+            }
+            else {
+              item.data = itemData; // TODO: create a method item.setData ?
+              changed++;
+            }
+          }
+
+          if (!item) {
+            // create item
+            if (constructor) {
+              item = new constructor(me, itemData, options, defaultOptions);
+              changed++;
+            }
+            else {
+              throw new TypeError('Unknown item type "' + type + '"');
+            }
+          }
+
+          // force a repaint (not only a reposition)
+          item.repaint();
+
+          items[id] = item;
+        }
+
+        // update queue
+        delete queue[id];
+        break;
+
+      case 'remove':
+        if (item) {
+          // remove DOM of the item
+          changed += item.hide();
+        }
+
+        // update lists
+        delete items[id];
+        delete queue[id];
+        break;
+
+      default:
+        console.log('Error: unknown action "' + action + '"');
+    }
+  });
+
+  // reposition all items. Show items only when in the visible area
+  util.forEach(this.items, function (item) {
+    if (item.visible) {
+      changed += item.show();
+      item.reposition();
+    }
+    else {
+      changed += item.hide();
+    }
+  });
+
+  return (changed > 0);
+};
+
+/**
+ * Get the foreground container element
+ * @return {HTMLElement} foreground
+ */
+ItemSet.prototype.getForeground = function getForeground() {
+  return this.dom.foreground;
+};
+
+/**
+ * Get the background container element
+ * @return {HTMLElement} background
+ */
+ItemSet.prototype.getBackground = function getBackground() {
+  return this.dom.background;
+};
+
+/**
+ * Get the axis container element
+ * @return {HTMLElement} axis
+ */
+ItemSet.prototype.getAxis = function getAxis() {
+  return this.dom.axis;
+};
+
+/**
+ * Reflow the component
+ * @return {Boolean} resized
+ */
+ItemSet.prototype.reflow = function reflow () {
+  var changed = 0,
+      options = this.options,
+      marginAxis = options.margin && options.margin.axis || this.defaultOptions.margin.axis,
+      marginItem = options.margin && options.margin.item || this.defaultOptions.margin.item,
+      update = util.updateProperty,
+      asNumber = util.option.asNumber,
+      asSize = util.option.asSize,
+      frame = this.frame;
+
+  if (frame) {
+    this._updateConversion();
+
+    util.forEach(this.items, function (item) {
+      changed += item.reflow();
+    });
+
+    // TODO: stack.update should be triggered via an event, in stack itself
+    // TODO: only update the stack when there are changed items
+    this.stack.update();
+
+    var maxHeight = asNumber(options.maxHeight);
+    var fixedHeight = (asSize(options.height) != null);
+    var height;
+    if (fixedHeight) {
+      height = frame.offsetHeight;
+    }
+    else {
+      // height is not specified, determine the height from the height and positioned items
+      var visibleItems = this.stack.ordered; // TODO: not so nice way to get the filtered items
+      if (visibleItems.length) {
+        var min = visibleItems[0].top;
+        var max = visibleItems[0].top + visibleItems[0].height;
+        util.forEach(visibleItems, function (item) {
+          min = Math.min(min, item.top);
+          max = Math.max(max, (item.top + item.height));
+        });
+        height = (max - min) + marginAxis + marginItem;
+      }
+      else {
+        height = marginAxis + marginItem;
+      }
+    }
+    if (maxHeight != null) {
+      height = Math.min(height, maxHeight);
+    }
+    changed += update(this, 'height', height);
+
+    // calculate height from items
+    changed += update(this, 'top', frame.offsetTop);
+    changed += update(this, 'left', frame.offsetLeft);
+    changed += update(this, 'width', frame.offsetWidth);
+  }
+  else {
+    changed += 1;
+  }
+
+  return (changed > 0);
+};
+
+/**
+ * Hide this component from the DOM
+ * @return {Boolean} changed
+ */
+ItemSet.prototype.hide = function hide() {
+  var changed = false;
+
+  // remove the DOM
+  if (this.frame && this.frame.parentNode) {
+    this.frame.parentNode.removeChild(this.frame);
+    changed = true;
+  }
+  if (this.dom.axis && this.dom.axis.parentNode) {
+    this.dom.axis.parentNode.removeChild(this.dom.axis);
+    changed = true;
+  }
+
+  return changed;
+};
+
+/**
+ * Set items
+ * @param {vis.DataSet | null} items
+ */
+ItemSet.prototype.setItems = function setItems(items) {
+  var me = this,
+      ids,
+      oldItemsData = this.itemsData;
+
+  // replace the dataset
+  if (!items) {
+    this.itemsData = null;
+  }
+  else if (items instanceof DataSet || items instanceof DataView) {
+    this.itemsData = items;
+  }
+  else {
+    throw new TypeError('Data must be an instance of DataSet');
+  }
+
+  if (oldItemsData) {
+    // unsubscribe from old dataset
+    util.forEach(this.listeners, function (callback, event) {
+      oldItemsData.unsubscribe(event, callback);
+    });
+
+    // remove all drawn items
+    ids = oldItemsData.getIds();
+    this._onRemove(ids);
+  }
+
+  if (this.itemsData) {
+    // subscribe to new dataset
+    var id = this.id;
+    util.forEach(this.listeners, function (callback, event) {
+      me.itemsData.subscribe(event, callback, id);
+    });
+
+    // draw all new items
+    ids = this.itemsData.getIds();
+    this._onAdd(ids);
+  }
+};
+
+/**
+ * Get the current items items
+ * @returns {vis.DataSet | null}
+ */
+ItemSet.prototype.getItems = function getItems() {
+  return this.itemsData;
+};
+
+/**
+ * Handle updated items
+ * @param {Number[]} ids
+ * @private
+ */
+ItemSet.prototype._onUpdate = function _onUpdate(ids) {
+  this._toQueue('update', ids);
+};
+
+/**
+ * Handle changed items
+ * @param {Number[]} ids
+ * @private
+ */
+ItemSet.prototype._onAdd = function _onAdd(ids) {
+  this._toQueue('add', ids);
+};
+
+/**
+ * Handle removed items
+ * @param {Number[]} ids
+ * @private
+ */
+ItemSet.prototype._onRemove = function _onRemove(ids) {
+  this._toQueue('remove', ids);
+};
+
+/**
+ * Put items in the queue to be added/updated/remove
+ * @param {String} action     can be 'add', 'update', 'remove'
+ * @param {Number[]} ids
+ */
+ItemSet.prototype._toQueue = function _toQueue(action, ids) {
+  var queue = this.queue;
+  ids.forEach(function (id) {
+    queue[id] = action;
+  });
+
+  if (this.controller) {
+    //this.requestReflow();
+    this.requestRepaint();
+  }
+};
+
+/**
+ * Calculate the scale and offset to convert a position on screen to the
+ * corresponding date and vice versa.
+ * After the method _updateConversion is executed once, the methods toTime
+ * and toScreen can be used.
+ * @private
+ */
+ItemSet.prototype._updateConversion = function _updateConversion() {
+  var range = this.range;
+  if (!range) {
+    throw new Error('No range configured');
+  }
+
+  if (range.conversion) {
+    this.conversion = range.conversion(this.width);
+  }
+  else {
+    this.conversion = Range.conversion(range.start, range.end, this.width);
+  }
+};
+
+/**
+ * Convert a position on screen (pixels) to a datetime
+ * Before this method can be used, the method _updateConversion must be
+ * executed once.
+ * @param {int}     x    Position on the screen in pixels
+ * @return {Date}   time The datetime the corresponds with given position x
+ */
+ItemSet.prototype.toTime = function toTime(x) {
+  var conversion = this.conversion;
+  return new Date(x / conversion.scale + conversion.offset);
+};
+
+/**
+ * Convert a datetime (Date object) into a position on the screen
+ * Before this method can be used, the method _updateConversion must be
+ * executed once.
+ * @param {Date}   time A date
+ * @return {int}   x    The position on the screen in pixels which corresponds
+ *                      with the given date.
+ */
+ItemSet.prototype.toScreen = function toScreen(time) {
+  var conversion = this.conversion;
+  return (time.valueOf() - conversion.offset) * conversion.scale;
+};
+
+/**
+ * @constructor Item
+ * @param {ItemSet} parent
+ * @param {Object} data             Object containing (optional) parameters type,
+ *                                  start, end, content, group, className.
+ * @param {Object} [options]        Options to set initial property values
+ * @param {Object} [defaultOptions] default options
+ *                                  // TODO: describe available options
+ */
+function Item (parent, data, options, defaultOptions) {
+  this.parent = parent;
+  this.data = data;
+  this.dom = null;
+  this.options = options || {};
+  this.defaultOptions = defaultOptions || {};
+
+  this.selected = false;
+  this.visible = false;
+  this.top = 0;
+  this.left = 0;
+  this.width = 0;
+  this.height = 0;
+}
+
+/**
+ * Select current item
+ */
+Item.prototype.select = function select() {
+  this.selected = true;
+};
+
+/**
+ * Unselect current item
+ */
+Item.prototype.unselect = function unselect() {
+  this.selected = false;
+};
+
+/**
+ * Show the Item in the DOM (when not already visible)
+ * @return {Boolean} changed
+ */
+Item.prototype.show = function show() {
+  return false;
+};
+
+/**
+ * Hide the Item from the DOM (when visible)
+ * @return {Boolean} changed
+ */
+Item.prototype.hide = function hide() {
+  return false;
+};
+
+/**
+ * Repaint the item
+ * @return {Boolean} changed
+ */
+Item.prototype.repaint = function repaint() {
+  // should be implemented by the item
+  return false;
+};
+
+/**
+ * Reflow the item
+ * @return {Boolean} resized
+ */
+Item.prototype.reflow = function reflow() {
+  // should be implemented by the item
+  return false;
+};
+
+/**
+ * Return the items width
+ * @return {Integer} width
+ */
+Item.prototype.getWidth = function getWidth() {
+  return this.width;
+}
+
+/**
+ * @constructor ItemBox
+ * @extends Item
+ * @param {ItemSet} parent
+ * @param {Object} data             Object containing parameters start
+ *                                  content, className.
+ * @param {Object} [options]        Options to set initial property values
+ * @param {Object} [defaultOptions] default options
+ *                                  // TODO: describe available options
+ */
+function ItemBox (parent, data, options, defaultOptions) {
+  this.props = {
+    dot: {
+      left: 0,
+      top: 0,
+      width: 0,
+      height: 0
+    },
+    line: {
+      top: 0,
+      left: 0,
+      width: 0,
+      height: 0
+    }
+  };
+
+  Item.call(this, parent, data, options, defaultOptions);
+}
+
+ItemBox.prototype = new Item (null, null);
+
+/**
+ * Select the item
+ * @override
+ */
+ItemBox.prototype.select = function select() {
+  this.selected = true;
+  // TODO: select and unselect
+};
+
+/**
+ * Unselect the item
+ * @override
+ */
+ItemBox.prototype.unselect = function unselect() {
+  this.selected = false;
+  // TODO: select and unselect
+};
+
+/**
+ * Repaint the item
+ * @return {Boolean} changed
+ */
+ItemBox.prototype.repaint = function repaint() {
+  // TODO: make an efficient repaint
+  var changed = false;
+  var dom = this.dom;
+
+  if (!dom) {
+    this._create();
+    dom = this.dom;
+    changed = true;
+  }
+
+  if (dom) {
+    if (!this.parent) {
+      throw new Error('Cannot repaint item: no parent attached');
+    }
+
+    if (!dom.box.parentNode) {
+      var foreground = this.parent.getForeground();
+      if (!foreground) {
+        throw new Error('Cannot repaint time axis: ' +
+            'parent has no foreground container element');
+      }
+      foreground.appendChild(dom.box);
+      changed = true;
+    }
+
+    if (!dom.line.parentNode) {
+      var background = this.parent.getBackground();
+      if (!background) {
+        throw new Error('Cannot repaint time axis: ' +
+            'parent has no background container element');
+      }
+      background.appendChild(dom.line);
+      changed = true;
+    }
+
+    if (!dom.dot.parentNode) {
+      var axis = this.parent.getAxis();
+      if (!background) {
+        throw new Error('Cannot repaint time axis: ' +
+            'parent has no axis container element');
+      }
+      axis.appendChild(dom.dot);
+      changed = true;
+    }
+
+    // update contents
+    if (this.data.content != this.content) {
+      this.content = this.data.content;
+      if (this.content instanceof Element) {
+        dom.content.innerHTML = '';
+        dom.content.appendChild(this.content);
+      }
+      else if (this.data.content != undefined) {
+        dom.content.innerHTML = this.content;
+      }
+      else {
+        throw new Error('Property "content" missing in item ' + this.data.id);
+      }
+      changed = true;
+    }
+
+    // update class
+    var className = (this.data.className? ' ' + this.data.className : '') +
+        (this.selected ? ' selected' : '');
+    if (this.className != className) {
+      this.className = className;
+      dom.box.className = 'item box' + className;
+      dom.line.className = 'item line' + className;
+      dom.dot.className  = 'item dot' + className;
+      changed = true;
+    }
+  }
+
+  return changed;
+};
+
+/**
+ * Show the item in the DOM (when not already visible). The items DOM will
+ * be created when needed.
+ * @return {Boolean} changed
+ */
+ItemBox.prototype.show = function show() {
+  if (!this.dom || !this.dom.box.parentNode) {
+    return this.repaint();
+  }
+  else {
+    return false;
+  }
+};
+
+/**
+ * Hide the item from the DOM (when visible)
+ * @return {Boolean} changed
+ */
+ItemBox.prototype.hide = function hide() {
+  var changed = false,
+      dom = this.dom;
+  if (dom) {
+    if (dom.box.parentNode) {
+      dom.box.parentNode.removeChild(dom.box);
+      changed = true;
+    }
+    if (dom.line.parentNode) {
+      dom.line.parentNode.removeChild(dom.line);
+    }
+    if (dom.dot.parentNode) {
+      dom.dot.parentNode.removeChild(dom.dot);
+    }
+  }
+  return changed;
+};
+
+/**
+ * Reflow the item: calculate its actual size and position from the DOM
+ * @return {boolean} resized    returns true if the axis is resized
+ * @override
+ */
+ItemBox.prototype.reflow = function reflow() {
+  var changed = 0,
+      update,
+      dom,
+      props,
+      options,
+      margin,
+      start,
+      align,
+      orientation,
+      top,
+      left,
+      data,
+      range;
+
+  if (this.data.start == undefined) {
+    throw new Error('Property "start" missing in item ' + this.data.id);
+  }
+
+  data = this.data;
+  range = this.parent && this.parent.range;
+  if (data && range) {
+    // TODO: account for the width of the item
+    var interval = (range.end - range.start);
+    this.visible = (data.start > range.start - interval) && (data.start < range.end + interval);
+  }
+  else {
+    this.visible = false;
+  }
+
+  if (this.visible) {
+    dom = this.dom;
+    if (dom) {
+      update = util.updateProperty;
+      props = this.props;
+      options = this.options;
+      start = this.parent.toScreen(this.data.start);
+      align = options.align || this.defaultOptions.align;
+      margin = options.margin && options.margin.axis || this.defaultOptions.margin.axis;
+      orientation = options.orientation || this.defaultOptions.orientation;
+
+      changed += update(props.dot, 'height', dom.dot.offsetHeight);
+      changed += update(props.dot, 'width', dom.dot.offsetWidth);
+      changed += update(props.line, 'width', dom.line.offsetWidth);
+      changed += update(props.line, 'height', dom.line.offsetHeight);
+      changed += update(props.line, 'top', dom.line.offsetTop);
+      changed += update(this, 'width', dom.box.offsetWidth);
+      changed += update(this, 'height', dom.box.offsetHeight);
+      if (align == 'right') {
+        left = start - this.width;
+      }
+      else if (align == 'left') {
+        left = start;
+      }
+      else {
+        // default or 'center'
+        left = start - this.width / 2;
+      }
+      changed += update(this, 'left', left);
+
+      changed += update(props.line, 'left', start - props.line.width / 2);
+      changed += update(props.dot, 'left', start - props.dot.width / 2);
+      changed += update(props.dot, 'top', -props.dot.height / 2);
+      if (orientation == 'top') {
+        top = margin;
+
+        changed += update(this, 'top', top);
+      }
+      else {
+        // default or 'bottom'
+        var parentHeight = this.parent.height;
+        top = parentHeight - this.height - margin;
+
+        changed += update(this, 'top', top);
+      }
+    }
+    else {
+      changed += 1;
+    }
+  }
+
+  return (changed > 0);
+};
+
+/**
+ * Create an items DOM
+ * @private
+ */
+ItemBox.prototype._create = function _create() {
+  var dom = this.dom;
+  if (!dom) {
+    this.dom = dom = {};
+
+    // create the box
+    dom.box = document.createElement('DIV');
+    // className is updated in repaint()
+
+    // contents box (inside the background box). used for making margins
+    dom.content = document.createElement('DIV');
+    dom.content.className = 'content';
+    dom.box.appendChild(dom.content);
+
+    // line to axis
+    dom.line = document.createElement('DIV');
+    dom.line.className = 'line';
+
+    // dot on axis
+    dom.dot = document.createElement('DIV');
+    dom.dot.className = 'dot';
+  }
+};
+
+/**
+ * Reposition the item, recalculate its left, top, and width, using the current
+ * range and size of the items itemset
+ * @override
+ */
+ItemBox.prototype.reposition = function reposition() {
+  var dom = this.dom,
+      props = this.props,
+      orientation = this.options.orientation || this.defaultOptions.orientation;
+
+  if (dom) {
+    var box = dom.box,
+        line = dom.line,
+        dot = dom.dot;
+
+    box.style.left = this.left + 'px';
+    box.style.top = this.top + 'px';
+
+    line.style.left = props.line.left + 'px';
+    if (orientation == 'top') {
+      line.style.top = 0 + 'px';
+      line.style.height = this.top + 'px';
+    }
+    else {
+      // orientation 'bottom'
+      line.style.top = (this.top + this.height) + 'px';
+      line.style.height = Math.max(this.parent.height - this.top - this.height +
+          this.props.dot.height / 2, 0) + 'px';
+    }
+
+    dot.style.left = props.dot.left + 'px';
+    dot.style.top = props.dot.top + 'px';
+  }
+};
+
+/**
+ * @constructor ItemPoint
+ * @extends Item
+ * @param {ItemSet} parent
+ * @param {Object} data             Object containing parameters start
+ *                                  content, className.
+ * @param {Object} [options]        Options to set initial property values
+ * @param {Object} [defaultOptions] default options
+ *                                  // TODO: describe available options
+ */
+function ItemPoint (parent, data, options, defaultOptions) {
+  this.props = {
+    dot: {
+      top: 0,
+      width: 0,
+      height: 0
+    },
+    content: {
+      height: 0,
+      marginLeft: 0
+    }
+  };
+
+  Item.call(this, parent, data, options, defaultOptions);
+}
+
+ItemPoint.prototype = new Item (null, null);
+
+/**
+ * Select the item
+ * @override
+ */
+ItemPoint.prototype.select = function select() {
+  this.selected = true;
+  // TODO: select and unselect
+};
+
+/**
+ * Unselect the item
+ * @override
+ */
+ItemPoint.prototype.unselect = function unselect() {
+  this.selected = false;
+  // TODO: select and unselect
+};
+
+/**
+ * Repaint the item
+ * @return {Boolean} changed
+ */
+ItemPoint.prototype.repaint = function repaint() {
+  // TODO: make an efficient repaint
+  var changed = false;
+  var dom = this.dom;
+
+  if (!dom) {
+    this._create();
+    dom = this.dom;
+    changed = true;
+  }
+
+  if (dom) {
+    if (!this.parent) {
+      throw new Error('Cannot repaint item: no parent attached');
+    }
+    var foreground = this.parent.getForeground();
+    if (!foreground) {
+      throw new Error('Cannot repaint time axis: ' +
+          'parent has no foreground container element');
+    }
+
+    if (!dom.point.parentNode) {
+      foreground.appendChild(dom.point);
+      foreground.appendChild(dom.point);
+      changed = true;
+    }
+
+    // update contents
+    if (this.data.content != this.content) {
+      this.content = this.data.content;
+      if (this.content instanceof Element) {
+        dom.content.innerHTML = '';
+        dom.content.appendChild(this.content);
+      }
+      else if (this.data.content != undefined) {
+        dom.content.innerHTML = this.content;
+      }
+      else {
+        throw new Error('Property "content" missing in item ' + this.data.id);
+      }
+      changed = true;
+    }
+
+    // update class
+    var className = (this.data.className? ' ' + this.data.className : '') +
+        (this.selected ? ' selected' : '');
+    if (this.className != className) {
+      this.className = className;
+      dom.point.className  = 'item point' + className;
+      changed = true;
+    }
+  }
+
+  return changed;
+};
+
+/**
+ * Show the item in the DOM (when not already visible). The items DOM will
+ * be created when needed.
+ * @return {Boolean} changed
+ */
+ItemPoint.prototype.show = function show() {
+  if (!this.dom || !this.dom.point.parentNode) {
+    return this.repaint();
+  }
+  else {
+    return false;
+  }
+};
+
+/**
+ * Hide the item from the DOM (when visible)
+ * @return {Boolean} changed
+ */
+ItemPoint.prototype.hide = function hide() {
+  var changed = false,
+      dom = this.dom;
+  if (dom) {
+    if (dom.point.parentNode) {
+      dom.point.parentNode.removeChild(dom.point);
+      changed = true;
+    }
+  }
+  return changed;
+};
+
+/**
+ * Reflow the item: calculate its actual size from the DOM
+ * @return {boolean} resized    returns true if the axis is resized
+ * @override
+ */
+ItemPoint.prototype.reflow = function reflow() {
+  var changed = 0,
+      update,
+      dom,
+      props,
+      options,
+      margin,
+      orientation,
+      start,
+      top,
+      data,
+      range;
+
+  if (this.data.start == undefined) {
+    throw new Error('Property "start" missing in item ' + this.data.id);
+  }
+
+  data = this.data;
+  range = this.parent && this.parent.range;
+  if (data && range) {
+    // TODO: account for the width of the item
+    var interval = (range.end - range.start);
+    this.visible = (data.start > range.start - interval) && (data.start < range.end);
+  }
+  else {
+    this.visible = false;
+  }
+
+  if (this.visible) {
+    dom = this.dom;
+    if (dom) {
+      update = util.updateProperty;
+      props = this.props;
+      options = this.options;
+      orientation = options.orientation || this.defaultOptions.orientation;
+      margin = options.margin && options.margin.axis || this.defaultOptions.margin.axis;
+      start = this.parent.toScreen(this.data.start);
+
+      changed += update(this, 'width', dom.point.offsetWidth);
+      changed += update(this, 'height', dom.point.offsetHeight);
+      changed += update(props.dot, 'width', dom.dot.offsetWidth);
+      changed += update(props.dot, 'height', dom.dot.offsetHeight);
+      changed += update(props.content, 'height', dom.content.offsetHeight);
+
+      if (orientation == 'top') {
+        top = margin;
+      }
+      else {
+        // default or 'bottom'
+        var parentHeight = this.parent.height;
+        top = Math.max(parentHeight - this.height - margin, 0);
+      }
+      changed += update(this, 'top', top);
+      changed += update(this, 'left', start - props.dot.width / 2);
+      changed += update(props.content, 'marginLeft', 1.5 * props.dot.width);
+      //changed += update(props.content, 'marginRight', 0.5 * props.dot.width); // TODO
+
+      changed += update(props.dot, 'top', (this.height - props.dot.height) / 2);
+    }
+    else {
+      changed += 1;
+    }
+  }
+
+  return (changed > 0);
+};
+
+/**
+ * Create an items DOM
+ * @private
+ */
+ItemPoint.prototype._create = function _create() {
+  var dom = this.dom;
+  if (!dom) {
+    this.dom = dom = {};
+
+    // background box
+    dom.point = document.createElement('div');
+    // className is updated in repaint()
+
+    // contents box, right from the dot
+    dom.content = document.createElement('div');
+    dom.content.className = 'content';
+    dom.point.appendChild(dom.content);
+
+    // dot at start
+    dom.dot = document.createElement('div');
+    dom.dot.className  = 'dot';
+    dom.point.appendChild(dom.dot);
+  }
+};
+
+/**
+ * Reposition the item, recalculate its left, top, and width, using the current
+ * range and size of the items itemset
+ * @override
+ */
+ItemPoint.prototype.reposition = function reposition() {
+  var dom = this.dom,
+      props = this.props;
+
+  if (dom) {
+    dom.point.style.top = this.top + 'px';
+    dom.point.style.left = this.left + 'px';
+
+    dom.content.style.marginLeft = props.content.marginLeft + 'px';
+    //dom.content.style.marginRight = props.content.marginRight + 'px'; // TODO
+
+    dom.dot.style.top = props.dot.top + 'px';
+  }
+};
+
+/**
+ * @constructor ItemRange
+ * @extends Item
+ * @param {ItemSet} parent
+ * @param {Object} data             Object containing parameters start, end
+ *                                  content, className.
+ * @param {Object} [options]        Options to set initial property values
+ * @param {Object} [defaultOptions] default options
+ *                                  // TODO: describe available options
+ */
+function ItemRange (parent, data, options, defaultOptions) {
+  this.props = {
+    content: {
+      left: 0,
+      width: 0
+    }
+  };
+
+  Item.call(this, parent, data, options, defaultOptions);
+}
+
+ItemRange.prototype = new Item (null, null);
+
+/**
+ * Select the item
+ * @override
+ */
+ItemRange.prototype.select = function select() {
+  this.selected = true;
+  // TODO: select and unselect
+};
+
+/**
+ * Unselect the item
+ * @override
+ */
+ItemRange.prototype.unselect = function unselect() {
+  this.selected = false;
+  // TODO: select and unselect
+};
+
+/**
+ * Repaint the item
+ * @return {Boolean} changed
+ */
+ItemRange.prototype.repaint = function repaint() {
+  // TODO: make an efficient repaint
+  var changed = false;
+  var dom = this.dom;
+
+  if (!dom) {
+    this._create();
+    dom = this.dom;
+    changed = true;
+  }
+
+  if (dom) {
+    if (!this.parent) {
+      throw new Error('Cannot repaint item: no parent attached');
+    }
+    var foreground = this.parent.getForeground();
+    if (!foreground) {
+      throw new Error('Cannot repaint time axis: ' +
+          'parent has no foreground container element');
+    }
+
+    if (!dom.box.parentNode) {
+      foreground.appendChild(dom.box);
+      changed = true;
+    }
+
+    // update content
+    if (this.data.content != this.content) {
+      this.content = this.data.content;
+      if (this.content instanceof Element) {
+        dom.content.innerHTML = '';
+        dom.content.appendChild(this.content);
+      }
+      else if (this.data.content != undefined) {
+        dom.content.innerHTML = this.content;
+      }
+      else {
+        throw new Error('Property "content" missing in item ' + this.data.id);
+      }
+      changed = true;
+    }
+
+    // update class
+    var className = this.data.className ? (' ' + this.data.className) : '';
+    if (this.className != className) {
+      this.className = className;
+      dom.box.className = 'item range' + className;
+      changed = true;
+    }
+  }
+
+  return changed;
+};
+
+/**
+ * Show the item in the DOM (when not already visible). The items DOM will
+ * be created when needed.
+ * @return {Boolean} changed
+ */
+ItemRange.prototype.show = function show() {
+  if (!this.dom || !this.dom.box.parentNode) {
+    return this.repaint();
+  }
+  else {
+    return false;
+  }
+};
+
+/**
+ * Hide the item from the DOM (when visible)
+ * @return {Boolean} changed
+ */
+ItemRange.prototype.hide = function hide() {
+  var changed = false,
+      dom = this.dom;
+  if (dom) {
+    if (dom.box.parentNode) {
+      dom.box.parentNode.removeChild(dom.box);
+      changed = true;
+    }
+  }
+  return changed;
+};
+
+/**
+ * Reflow the item: calculate its actual size from the DOM
+ * @return {boolean} resized    returns true if the axis is resized
+ * @override
+ */
+ItemRange.prototype.reflow = function reflow() {
+  var changed = 0,
+      dom,
+      props,
+      options,
+      margin,
+      padding,
+      parent,
+      start,
+      end,
+      data,
+      range,
+      update,
+      box,
+      parentWidth,
+      contentLeft,
+      orientation,
+      top;
+
+  if (this.data.start == undefined) {
+    throw new Error('Property "start" missing in item ' + this.data.id);
+  }
+  if (this.data.end == undefined) {
+    throw new Error('Property "end" missing in item ' + this.data.id);
+  }
+
+  data = this.data;
+  range = this.parent && this.parent.range;
+  if (data && range) {
+    // TODO: account for the width of the item. Take some margin
+    this.visible = (data.start < range.end) && (data.end > range.start);
+  }
+  else {
+    this.visible = false;
+  }
+
+  if (this.visible) {
+    dom = this.dom;
+    if (dom) {
+      props = this.props;
+      options = this.options;
+      parent = this.parent;
+      start = parent.toScreen(this.data.start);
+      end = parent.toScreen(this.data.end);
+      update = util.updateProperty;
+      box = dom.box;
+      parentWidth = parent.width;
+      orientation = options.orientation || this.defaultOptions.orientation;
+      margin = options.margin && options.margin.axis || this.defaultOptions.margin.axis;
+      padding = options.padding || this.defaultOptions.padding;
+
+      changed += update(props.content, 'width', dom.content.offsetWidth);
+
+      changed += update(this, 'height', box.offsetHeight);
+
+      // limit the width of the this, as browsers cannot draw very wide divs
+      if (start < -parentWidth) {
+        start = -parentWidth;
+      }
+      if (end > 2 * parentWidth) {
+        end = 2 * parentWidth;
+      }
+
+      // when range exceeds left of the window, position the contents at the left of the visible area
+      if (start < 0) {
+        contentLeft = Math.min(-start,
+            (end - start - props.content.width - 2 * padding));
+        // TODO: remove the need for options.padding. it's terrible.
+      }
+      else {
+        contentLeft = 0;
+      }
+      changed += update(props.content, 'left', contentLeft);
+
+      if (orientation == 'top') {
+        top = margin;
+        changed += update(this, 'top', top);
+      }
+      else {
+        // default or 'bottom'
+        top = parent.height - this.height - margin;
+        changed += update(this, 'top', top);
+      }
+
+      changed += update(this, 'left', start);
+      changed += update(this, 'width', Math.max(end - start, 1)); // TODO: reckon with border width;
+    }
+    else {
+      changed += 1;
+    }
+  }
+
+  return (changed > 0);
+};
+
+/**
+ * Create an items DOM
+ * @private
+ */
+ItemRange.prototype._create = function _create() {
+  var dom = this.dom;
+  if (!dom) {
+    this.dom = dom = {};
+    // background box
+    dom.box = document.createElement('div');
+    // className is updated in repaint()
+
+    // contents box
+    dom.content = document.createElement('div');
+    dom.content.className = 'content';
+    dom.box.appendChild(dom.content);
+  }
+};
+
+/**
+ * Reposition the item, recalculate its left, top, and width, using the current
+ * range and size of the items itemset
+ * @override
+ */
+ItemRange.prototype.reposition = function reposition() {
+  var dom = this.dom,
+      props = this.props;
+
+  if (dom) {
+    dom.box.style.top = this.top + 'px';
+    dom.box.style.left = this.left + 'px';
+    dom.box.style.width = this.width + 'px';
+
+    dom.content.style.left = props.content.left + 'px';
+  }
+};
+
+/**
+ * @constructor ItemRangeOverflow
+ * @extends ItemRange
+ * @param {ItemSet} parent
+ * @param {Object} data             Object containing parameters start, end
+ *                                  content, className.
+ * @param {Object} [options]        Options to set initial property values
+ * @param {Object} [defaultOptions] default options
+ *                                  // TODO: describe available options
+ */
+function ItemRangeOverflow (parent, data, options, defaultOptions) {
+  this.props = {
+    content: {
+      left: 0,
+      width: 0
+    }
+  };
+
+  ItemRange.call(this, parent, data, options, defaultOptions);
+}
+
+ItemRangeOverflow.prototype = new ItemRange (null, null);
+
+/**
+ * Repaint the item
+ * @return {Boolean} changed
+ */
+ItemRangeOverflow.prototype.repaint = function repaint() {
+  // TODO: make an efficient repaint
+  var changed = false;
+  var dom = this.dom;
+
+  if (!dom) {
+    this._create();
+    dom = this.dom;
+    changed = true;
+  }
+
+  if (dom) {
+    if (!this.parent) {
+      throw new Error('Cannot repaint item: no parent attached');
+    }
+    var foreground = this.parent.getForeground();
+    if (!foreground) {
+      throw new Error('Cannot repaint time axis: ' +
+          'parent has no foreground container element');
+    }
+
+    if (!dom.box.parentNode) {
+      foreground.appendChild(dom.box);
+      changed = true;
+    }
+
+    // update content
+    if (this.data.content != this.content) {
+      this.content = this.data.content;
+      if (this.content instanceof Element) {
+        dom.content.innerHTML = '';
+        dom.content.appendChild(this.content);
+      }
+      else if (this.data.content != undefined) {
+        dom.content.innerHTML = this.content;
+      }
+      else {
+        throw new Error('Property "content" missing in item ' + this.data.id);
+      }
+      changed = true;
+    }
+
+    // update class
+    var className = this.data.className ? (' ' + this.data.className) : '';
+    if (this.className != className) {
+      this.className = className;
+      dom.box.className = 'item rangeoverflow' + className;
+      changed = true;
+    }
+  }
+
+  return changed;
+};
+
+/**
+ * Return the items width
+ * @return {Number} width
+ */
+ItemRangeOverflow.prototype.getWidth = function getWidth() {
+  if (this.props.content !== undefined && this.width < this.props.content.width)
+    return this.props.content.width;
+  else
+    return this.width;
+};
+
+/**
+ * @constructor Group
+ * @param {GroupSet} parent
+ * @param {Number | String} groupId
+ * @param {Object} [options]  Options to set initial property values
+ *                            // TODO: describe available options
+ * @extends Component
+ */
+function Group (parent, groupId, options) {
+  this.id = util.randomUUID();
+  this.parent = parent;
+
+  this.groupId = groupId;
+  this.itemset = null;    // ItemSet
+  this.options = options || {};
+  this.options.top = 0;
+
+  this.props = {
+    label: {
+      width: 0,
+      height: 0
+    }
+  };
+
+  this.top = 0;
+  this.left = 0;
+  this.width = 0;
+  this.height = 0;
+}
+
+Group.prototype = new Component();
+
+// TODO: comment
+Group.prototype.setOptions = Component.prototype.setOptions;
+
+/**
+ * Get the container element of the panel, which can be used by a child to
+ * add its own widgets.
+ * @returns {HTMLElement} container
+ */
+Group.prototype.getContainer = function () {
+  return this.parent.getContainer();
+};
+
+/**
+ * Set item set for the group. The group will create a view on the itemset,
+ * filtered by the groups id.
+ * @param {DataSet | DataView} items
+ */
+Group.prototype.setItems = function setItems(items) {
+  if (this.itemset) {
+    // remove current item set
+    this.itemset.hide();
+    this.itemset.setItems();
+
+    this.parent.controller.remove(this.itemset);
+    this.itemset = null;
+  }
+
+  if (items) {
+    var groupId = this.groupId;
+
+    var itemsetOptions = Object.create(this.options);
+    this.itemset = new ItemSet(this, null, itemsetOptions);
+    this.itemset.setRange(this.parent.range);
+
+    this.view = new DataView(items, {
+      filter: function (item) {
+        return item.group == groupId;
+      }
+    });
+    this.itemset.setItems(this.view);
+
+    this.parent.controller.add(this.itemset);
+  }
+};
+
+/**
+ * Repaint the item
+ * @return {Boolean} changed
+ */
+Group.prototype.repaint = function repaint() {
+  return false;
+};
+
+/**
+ * Reflow the item
+ * @return {Boolean} resized
+ */
+Group.prototype.reflow = function reflow() {
+  var changed = 0,
+      update = util.updateProperty;
+
+  changed += update(this, 'top',    this.itemset ? this.itemset.top : 0);
+  changed += update(this, 'height', this.itemset ? this.itemset.height : 0);
+
+  // TODO: reckon with the height of the group label
+
+  if (this.label) {
+    var inner = this.label.firstChild;
+    changed += update(this.props.label, 'width', inner.clientWidth);
+    changed += update(this.props.label, 'height', inner.clientHeight);
+  }
+  else {
+    changed += update(this.props.label, 'width', 0);
+    changed += update(this.props.label, 'height', 0);
+  }
+
+  return (changed > 0);
+};
+
+/**
+ * An GroupSet holds a set of groups
+ * @param {Component} parent
+ * @param {Component[]} [depends]   Components on which this components depends
+ *                                  (except for the parent)
+ * @param {Object} [options]        See GroupSet.setOptions for the available
+ *                                  options.
+ * @constructor GroupSet
+ * @extends Panel
+ */
+function GroupSet(parent, depends, options) {
+  this.id = util.randomUUID();
+  this.parent = parent;
+  this.depends = depends;
+
+  this.options = options || {};
+
+  this.range = null;      // Range or Object {start: number, end: number}
+  this.itemsData = null;  // DataSet with items
+  this.groupsData = null; // DataSet with groups
+
+  this.groups = {};       // map with groups
+
+  this.dom = {};
+  this.props = {
+    labels: {
+      width: 0
+    }
+  };
+
+  // TODO: implement right orientation of the labels
+
+  // changes in groups are queued  key/value map containing id/action
+  this.queue = {};
+
+  var me = this;
+  this.listeners = {
+    'add': function (event, params) {
+      me._onAdd(params.items);
+    },
+    'update': function (event, params) {
+      me._onUpdate(params.items);
+    },
+    'remove': function (event, params) {
+      me._onRemove(params.items);
+    }
+  };
+}
+
+GroupSet.prototype = new Panel();
+
+/**
+ * Set options for the GroupSet. Existing options will be extended/overwritten.
+ * @param {Object} [options] The following options are available:
+ *                           {String | function} groupsOrder
+ *                           TODO: describe options
+ */
+GroupSet.prototype.setOptions = Component.prototype.setOptions;
+
+GroupSet.prototype.setRange = function (range) {
+  // TODO: implement setRange
+};
+
+/**
+ * Set items
+ * @param {vis.DataSet | null} items
+ */
+GroupSet.prototype.setItems = function setItems(items) {
+  this.itemsData = items;
+
+  for (var id in this.groups) {
+    if (this.groups.hasOwnProperty(id)) {
+      var group = this.groups[id];
+      group.setItems(items);
+    }
+  }
+};
+
+/**
+ * Get items
+ * @return {vis.DataSet | null} items
+ */
+GroupSet.prototype.getItems = function getItems() {
+  return this.itemsData;
+};
+
+/**
+ * Set range (start and end).
+ * @param {Range | Object} range  A Range or an object containing start and end.
+ */
+GroupSet.prototype.setRange = function setRange(range) {
+  this.range = range;
+};
+
+/**
+ * Set groups
+ * @param {vis.DataSet} groups
+ */
+GroupSet.prototype.setGroups = function setGroups(groups) {
+  var me = this,
+      ids;
+
+  // unsubscribe from current dataset
+  if (this.groupsData) {
+    util.forEach(this.listeners, function (callback, event) {
+      me.groupsData.unsubscribe(event, callback);
+    });
+
+    // remove all drawn groups
+    ids = this.groupsData.getIds();
+    this._onRemove(ids);
+  }
+
+  // replace the dataset
+  if (!groups) {
+    this.groupsData = null;
+  }
+  else if (groups instanceof DataSet) {
+    this.groupsData = groups;
+  }
+  else {
+    this.groupsData = new DataSet({
+      convert: {
+        start: 'Date',
+        end: 'Date'
+      }
+    });
+    this.groupsData.add(groups);
+  }
+
+  if (this.groupsData) {
+    // subscribe to new dataset
+    var id = this.id;
+    util.forEach(this.listeners, function (callback, event) {
+      me.groupsData.subscribe(event, callback, id);
+    });
+
+    // draw all new groups
+    ids = this.groupsData.getIds();
+    this._onAdd(ids);
+  }
+};
+
+/**
+ * Get groups
+ * @return {vis.DataSet | null} groups
+ */
+GroupSet.prototype.getGroups = function getGroups() {
+  return this.groupsData;
+};
+
+/**
+ * Repaint the component
+ * @return {Boolean} changed
+ */
+GroupSet.prototype.repaint = function repaint() {
+  var changed = 0,
+      i, id, group, label,
+      update = util.updateProperty,
+      asSize = util.option.asSize,
+      asElement = util.option.asElement,
+      options = this.options,
+      frame = this.dom.frame,
+      labels = this.dom.labels,
+      labelSet = this.dom.labelSet;
+
+  // create frame
+  if (!this.parent) {
+    throw new Error('Cannot repaint groupset: no parent attached');
+  }
+  var parentContainer = this.parent.getContainer();
+  if (!parentContainer) {
+    throw new Error('Cannot repaint groupset: parent has no container element');
+  }
+  if (!frame) {
+    frame = document.createElement('div');
+    frame.className = 'groupset';
+    this.dom.frame = frame;
+
+    var className = options.className;
+    if (className) {
+      util.addClassName(frame, util.option.asString(className));
+    }
+
+    changed += 1;
+  }
+  if (!frame.parentNode) {
+    parentContainer.appendChild(frame);
+    changed += 1;
+  }
+
+  // create labels
+  var labelContainer = asElement(options.labelContainer);
+  if (!labelContainer) {
+    throw new Error('Cannot repaint groupset: option "labelContainer" not defined');
+  }
+  if (!labels) {
+    labels = document.createElement('div');
+    labels.className = 'labels';
+    this.dom.labels = labels;
+  }
+  if (!labelSet) {
+    labelSet = document.createElement('div');
+    labelSet.className = 'label-set';
+    labels.appendChild(labelSet);
+    this.dom.labelSet = labelSet;
+  }
+  if (!labels.parentNode || labels.parentNode != labelContainer) {
+    if (labels.parentNode) {
+      labels.parentNode.removeChild(labels.parentNode);
+    }
+    labelContainer.appendChild(labels);
+  }
+
+  // reposition frame
+  changed += update(frame.style, 'height', asSize(options.height, this.height + 'px'));
+  changed += update(frame.style, 'top',    asSize(options.top, '0px'));
+  changed += update(frame.style, 'left',   asSize(options.left, '0px'));
+  changed += update(frame.style, 'width',  asSize(options.width, '100%'));
+
+  // reposition labels
+  changed += update(labelSet.style, 'top',    asSize(options.top, '0px'));
+  changed += update(labelSet.style, 'height', asSize(options.height, this.height + 'px'));
+
+  var me = this,
+      queue = this.queue,
+      groups = this.groups,
+      groupsData = this.groupsData;
+
+  // show/hide added/changed/removed groups
+  var ids = Object.keys(queue);
+  if (ids.length) {
+    ids.forEach(function (id) {
+      var action = queue[id];
+      var group = groups[id];
+
+      //noinspection FallthroughInSwitchStatementJS
+      switch (action) {
+        case 'add':
+        case 'update':
+          if (!group) {
+            var groupOptions = Object.create(me.options);
+            util.extend(groupOptions, {
+              height: null,
+              maxHeight: null
+            });
+
+            group = new Group(me, id, groupOptions);
+            group.setItems(me.itemsData); // attach items data
+            groups[id] = group;
+
+            me.controller.add(group);
+          }
+
+          // TODO: update group data
+          group.data = groupsData.get(id);
+
+          delete queue[id];
+          break;
+
+        case 'remove':
+          if (group) {
+            group.setItems(); // detach items data
+            delete groups[id];
+
+            me.controller.remove(group);
+          }
+
+          // update lists
+          delete queue[id];
+          break;
+
+        default:
+          console.log('Error: unknown action "' + action + '"');
+      }
+    });
+
+    // the groupset depends on each of the groups
+    //this.depends = this.groups; // TODO: gives a circular reference through the parent
+
+    // TODO: apply dependencies of the groupset
+
+    // update the top positions of the groups in the correct order
+    var orderedGroups = this.groupsData.getIds({
+      order: this.options.groupOrder
+    });
+    for (i = 0; i < orderedGroups.length; i++) {
+      (function (group, prevGroup) {
+        var top = 0;
+        if (prevGroup) {
+          top = function () {
+            // TODO: top must reckon with options.maxHeight
+            return prevGroup.top + prevGroup.height;
+          }
+        }
+        group.setOptions({
+          top: top
+        });
+      })(groups[orderedGroups[i]], groups[orderedGroups[i - 1]]);
+    }
+
+    // (re)create the labels
+    while (labelSet.firstChild) {
+      labelSet.removeChild(labelSet.firstChild);
+    }
+    for (i = 0; i < orderedGroups.length; i++) {
+      id = orderedGroups[i];
+      label = this._createLabel(id);
+      labelSet.appendChild(label);
+    }
+
+    changed++;
+  }
+
+  // reposition the labels
+  // TODO: labels are not displayed correctly when orientation=='top'
+  // TODO: width of labelPanel is not immediately updated on a change in groups
+  for (id in groups) {
+    if (groups.hasOwnProperty(id)) {
+      group = groups[id];
+      label = group.label;
+      if (label) {
+        label.style.top = group.top + 'px';
+        label.style.height = group.height + 'px';
+      }
+    }
+  }
+
+  return (changed > 0);
+};
+
+/**
+ * Create a label for group with given id
+ * @param {Number} id
+ * @return {Element} label
+ * @private
+ */
+GroupSet.prototype._createLabel = function(id) {
+  var group = this.groups[id];
+  var label = document.createElement('div');
+  label.className = 'label';
+  var inner = document.createElement('div');
+  inner.className = 'inner';
+  label.appendChild(inner);
+
+  var content = group.data && group.data.content;
+  if (content instanceof Element) {
+    inner.appendChild(content);
+  }
+  else if (content != undefined) {
+    inner.innerHTML = content;
+  }
+
+  var className = group.data && group.data.className;
+  if (className) {
+    util.addClassName(label, className);
+  }
+
+  group.label = label; // TODO: not so nice, parking labels in the group this way!!!
+
+  return label;
+};
+
+/**
+ * Get container element
+ * @return {HTMLElement} container
+ */
+GroupSet.prototype.getContainer = function getContainer() {
+  return this.dom.frame;
+};
+
+/**
+ * Get the width of the group labels
+ * @return {Number} width
+ */
+GroupSet.prototype.getLabelsWidth = function getContainer() {
+  return this.props.labels.width;
+};
+
+/**
+ * Reflow the component
+ * @return {Boolean} resized
+ */
+GroupSet.prototype.reflow = function reflow() {
+  var changed = 0,
+      id, group,
+      options = this.options,
+      update = util.updateProperty,
+      asNumber = util.option.asNumber,
+      asSize = util.option.asSize,
+      frame = this.dom.frame;
+
+  if (frame) {
+    var maxHeight = asNumber(options.maxHeight);
+    var fixedHeight = (asSize(options.height) != null);
+    var height;
+    if (fixedHeight) {
+      height = frame.offsetHeight;
+    }
+    else {
+      // height is not specified, calculate the sum of the height of all groups
+      height = 0;
+
+      for (id in this.groups) {
+        if (this.groups.hasOwnProperty(id)) {
+          group = this.groups[id];
+          height += group.height;
+        }
+      }
+    }
+    if (maxHeight != null) {
+      height = Math.min(height, maxHeight);
+    }
+    changed += update(this, 'height', height);
+
+    changed += update(this, 'top', frame.offsetTop);
+    changed += update(this, 'left', frame.offsetLeft);
+    changed += update(this, 'width', frame.offsetWidth);
+  }
+
+  // calculate the maximum width of the labels
+  var width = 0;
+  for (id in this.groups) {
+    if (this.groups.hasOwnProperty(id)) {
+      group = this.groups[id];
+      var labelWidth = group.props && group.props.label && group.props.label.width || 0;
+      width = Math.max(width, labelWidth);
+    }
+  }
+  changed += update(this.props.labels, 'width', width);
+
+  return (changed > 0);
+};
+
+/**
+ * Hide the component from the DOM
+ * @return {Boolean} changed
+ */
+GroupSet.prototype.hide = function hide() {
+  if (this.dom.frame && this.dom.frame.parentNode) {
+    this.dom.frame.parentNode.removeChild(this.dom.frame);
+    return true;
+  }
+  else {
+    return false;
+  }
+};
+
+/**
+ * Show the component in the DOM (when not already visible).
+ * A repaint will be executed when the component is not visible
+ * @return {Boolean} changed
+ */
+GroupSet.prototype.show = function show() {
+  if (!this.dom.frame || !this.dom.frame.parentNode) {
+    return this.repaint();
+  }
+  else {
+    return false;
+  }
+};
+
+/**
+ * Handle updated groups
+ * @param {Number[]} ids
+ * @private
+ */
+GroupSet.prototype._onUpdate = function _onUpdate(ids) {
+  this._toQueue(ids, 'update');
+};
+
+/**
+ * Handle changed groups
+ * @param {Number[]} ids
+ * @private
+ */
+GroupSet.prototype._onAdd = function _onAdd(ids) {
+  this._toQueue(ids, 'add');
+};
+
+/**
+ * Handle removed groups
+ * @param {Number[]} ids
+ * @private
+ */
+GroupSet.prototype._onRemove = function _onRemove(ids) {
+  this._toQueue(ids, 'remove');
+};
+
+/**
+ * Put groups in the queue to be added/updated/remove
+ * @param {Number[]} ids
+ * @param {String} action     can be 'add', 'update', 'remove'
+ */
+GroupSet.prototype._toQueue = function _toQueue(ids, action) {
+  var queue = this.queue;
+  ids.forEach(function (id) {
+    queue[id] = action;
+  });
+
+  if (this.controller) {
+    //this.requestReflow();
+    this.requestRepaint();
+  }
+};
+
+/**
+ * Create a timeline visualization
+ * @param {HTMLElement} container
+ * @param {vis.DataSet | Array | DataTable} [items]
+ * @param {Object} [options]  See Timeline.setOptions for the available options.
+ * @constructor
+ */
+function Timeline (container, items, options) {
+  var me = this;
+  var now = moment().hours(0).minutes(0).seconds(0).milliseconds(0);
+  this.options = {
+    orientation: 'bottom',
+    min: null,
+    max: null,
+    zoomMin: 10,                                // milliseconds
+    zoomMax: 1000 * 60 * 60 * 24 * 365 * 10000, // milliseconds
+    // moveable: true, // TODO: option moveable
+    // zoomable: true, // TODO: option zoomable
+    showMinorLabels: true,
+    showMajorLabels: true,
+    showCurrentTime: false,
+    showCustomTime: false,
+    autoResize: false
+  };
+
+  // controller
+  this.controller = new Controller();
+
+  // root panel
+  if (!container) {
+    throw new Error('No container element provided');
+  }
+  var rootOptions = Object.create(this.options);
+  rootOptions.height = function () {
+    // TODO: change to height
+    if (me.options.height) {
+      // fixed height
+      return me.options.height;
+    }
+    else {
+      // auto height
+      return (me.timeaxis.height + me.content.height) + 'px';
+    }
+  };
+  this.rootPanel = new RootPanel(container, rootOptions);
+  this.controller.add(this.rootPanel);
+
+  // item panel
+  var itemOptions = Object.create(this.options);
+  itemOptions.left = function () {
+    return me.labelPanel.width;
+  };
+  itemOptions.width = function () {
+    return me.rootPanel.width - me.labelPanel.width;
+  };
+  itemOptions.top = null;
+  itemOptions.height = null;
+  this.itemPanel = new Panel(this.rootPanel, [], itemOptions);
+  this.controller.add(this.itemPanel);
+
+  // label panel
+  var labelOptions = Object.create(this.options);
+  labelOptions.top = null;
+  labelOptions.left = null;
+  labelOptions.height = null;
+  labelOptions.width = function () {
+    if (me.content && typeof me.content.getLabelsWidth === 'function') {
+      return me.content.getLabelsWidth();
+    }
+    else {
+      return 0;
+    }
+  };
+  this.labelPanel = new Panel(this.rootPanel, [], labelOptions);
+  this.controller.add(this.labelPanel);
+
+  // range
+  var rangeOptions = Object.create(this.options);
+  this.range = new Range(rangeOptions);
+  this.range.setRange(
+      now.clone().add('days', -3).valueOf(),
+      now.clone().add('days', 4).valueOf()
+  );
+
+  // TODO: reckon with options moveable and zoomable
+  this.range.subscribe(this.rootPanel, 'move', 'horizontal');
+  this.range.subscribe(this.rootPanel, 'zoom', 'horizontal');
+  this.range.on('rangechange', function () {
+    var force = true;
+    me.controller.requestReflow(force);
+  });
+  this.range.on('rangechanged', function () {
+    var force = true;
+    me.controller.requestReflow(force);
+  });
+
+  // TODO: put the listeners in setOptions, be able to dynamically change with options moveable and zoomable
+
+  // time axis
+  var timeaxisOptions = Object.create(rootOptions);
+  timeaxisOptions.range = this.range;
+  timeaxisOptions.left = null;
+  timeaxisOptions.top = null;
+  timeaxisOptions.width = '100%';
+  timeaxisOptions.height = null;
+  this.timeaxis = new TimeAxis(this.itemPanel, [], timeaxisOptions);
+  this.timeaxis.setRange(this.range);
+  this.controller.add(this.timeaxis);
+
+  // current time bar
+  this.currenttime = new CurrentTime(this.timeaxis, [], rootOptions);
+  this.controller.add(this.currenttime);
+
+  // custom time bar
+  this.customtime = new CustomTime(this.timeaxis, [], rootOptions);
+  this.controller.add(this.customtime);
+
+  // create groupset
+  this.setGroups(null);
+
+  this.itemsData = null;      // DataSet
+  this.groupsData = null;     // DataSet
+
+  // apply options
+  if (options) {
+    this.setOptions(options);
+  }
+
+  // create itemset and groupset
+  if (items) {
+    this.setItems(items);
+  }
+}
+
+/**
+ * Set options
+ * @param {Object} options  TODO: describe the available options
+ */
+Timeline.prototype.setOptions = function (options) {
+  util.extend(this.options, options);
+
+  // force update of range
+  // options.start and options.end can be undefined
+  //this.range.setRange(options.start, options.end);
+  this.range.setRange();
+
+  this.controller.reflow();
+  this.controller.repaint();
+};
+
+/**
+ * Set a custom time bar
+ * @param {Date} time
+ */
+Timeline.prototype.setCustomTime = function (time) {
+  this.customtime._setCustomTime(time);
+};
+
+/**
+ * Retrieve the current custom time.
+ * @return {Date} customTime
+ */
+Timeline.prototype.getCustomTime = function() {
+  return new Date(this.customtime.customTime.valueOf());
+};
+
+/**
+ * Set items
+ * @param {vis.DataSet | Array | DataTable | null} items
+ */
+Timeline.prototype.setItems = function(items) {
+  var initialLoad = (this.itemsData == null);
+
+  // convert to type DataSet when needed
+  var newItemSet;
+  if (!items) {
+    newItemSet = null;
+  }
+  else if (items instanceof DataSet) {
+    newItemSet = items;
+  }
+  if (!(items instanceof DataSet)) {
+    newItemSet = new DataSet({
+      convert: {
+        start: 'Date',
+        end: 'Date'
+      }
+    });
+    newItemSet.add(items);
+  }
+
+  // set items
+  this.itemsData = newItemSet;
+  this.content.setItems(newItemSet);
+
+  if (initialLoad && (this.options.start == undefined || this.options.end == undefined)) {
+    // apply the data range as range
+    var dataRange = this.getItemRange();
+
+    // add 5% space on both sides
+    var min = dataRange.min;
+    var max = dataRange.max;
+    if (min != null && max != null) {
+      var interval = (max.valueOf() - min.valueOf());
+      if (interval <= 0) {
+        // prevent an empty interval
+        interval = 24 * 60 * 60 * 1000; // 1 day
+      }
+      min = new Date(min.valueOf() - interval * 0.05);
+      max = new Date(max.valueOf() + interval * 0.05);
+    }
+
+    // override specified start and/or end date
+    if (this.options.start != undefined) {
+      min = util.convert(this.options.start, 'Date');
+    }
+    if (this.options.end != undefined) {
+      max = util.convert(this.options.end, 'Date');
+    }
+
+    // apply range if there is a min or max available
+    if (min != null || max != null) {
+      this.range.setRange(min, max);
+    }
+  }
+};
+
+/**
+ * Set groups
+ * @param {vis.DataSet | Array | DataTable} groups
+ */
+Timeline.prototype.setGroups = function(groups) {
+  var me = this;
+  this.groupsData = groups;
+
+  // switch content type between ItemSet or GroupSet when needed
+  var Type = this.groupsData ? GroupSet : ItemSet;
+  if (!(this.content instanceof Type)) {
+    // remove old content set
+    if (this.content) {
+      this.content.hide();
+      if (this.content.setItems) {
+        this.content.setItems(); // disconnect from items
+      }
+      if (this.content.setGroups) {
+        this.content.setGroups(); // disconnect from groups
+      }
+      this.controller.remove(this.content);
+    }
+
+    // create new content set
+    var options = Object.create(this.options);
+    util.extend(options, {
+      top: function () {
+        if (me.options.orientation == 'top') {
+          return me.timeaxis.height;
+        }
+        else {
+          return me.itemPanel.height - me.timeaxis.height - me.content.height;
+        }
+      },
+      left: null,
+      width: '100%',
+      height: function () {
+        if (me.options.height) {
+          // fixed height
+          return me.itemPanel.height - me.timeaxis.height;
+        }
+        else {
+          // auto height
+          return null;
+        }
+      },
+      maxHeight: function () {
+        // TODO: change maxHeight to be a css string like '100%' or '300px'
+        if (me.options.maxHeight) {
+          if (!util.isNumber(me.options.maxHeight)) {
+            throw new TypeError('Number expected for property maxHeight');
+          }
+          return me.options.maxHeight - me.timeaxis.height;
+        }
+        else {
+          return null;
+        }
+      },
+      labelContainer: function () {
+        return me.labelPanel.getContainer();
+      }
+    });
+
+    this.content = new Type(this.itemPanel, [this.timeaxis], options);
+    if (this.content.setRange) {
+      this.content.setRange(this.range);
+    }
+    if (this.content.setItems) {
+      this.content.setItems(this.itemsData);
+    }
+    if (this.content.setGroups) {
+      this.content.setGroups(this.groupsData);
+    }
+    this.controller.add(this.content);
+  }
+};
+
+/**
+ * Get the data range of the item set.
+ * @returns {{min: Date, max: Date}} range  A range with a start and end Date.
+ *                                          When no minimum is found, min==null
+ *                                          When no maximum is found, max==null
+ */
+Timeline.prototype.getItemRange = function getItemRange() {
+  // calculate min from start filed
+  var itemsData = this.itemsData,
+      min = null,
+      max = null;
+
+  if (itemsData) {
+    // calculate the minimum value of the field 'start'
+    var minItem = itemsData.min('start');
+    min = minItem ? minItem.start.valueOf() : null;
+
+    // calculate maximum value of fields 'start' and 'end'
+    var maxStartItem = itemsData.max('start');
+    if (maxStartItem) {
+      max = maxStartItem.start.valueOf();
+    }
+    var maxEndItem = itemsData.max('end');
+    if (maxEndItem) {
+      if (max == null) {
+        max = maxEndItem.end.valueOf();
+      }
+      else {
+        max = Math.max(max, maxEndItem.end.valueOf());
+      }
+    }
+  }
+
+  return {
+    min: (min != null) ? new Date(min) : null,
+    max: (max != null) ? new Date(max) : null
+  };
+};
+
+(function(exports) {
+  /**
+   * Parse a text source containing data in DOT language into a JSON object.
+   * The object contains two lists: one with nodes and one with edges.
+   *
+   * DOT language reference: http://www.graphviz.org/doc/info/lang.html
+   *
+   * @param {String} data     Text containing a graph in DOT-notation
+   * @return {Object} graph   An object containing two parameters:
+   *                          {Object[]} nodes
+   *                          {Object[]} edges
+   */
+  function parseDOT (data) {
+    dot = data;
+    return parseGraph();
+  }
+
+  // token types enumeration
+  var TOKENTYPE = {
+    NULL : 0,
+    DELIMITER : 1,
+    IDENTIFIER: 2,
+    UNKNOWN : 3
+  };
+
+  // map with all delimiters
+  var DELIMITERS = {
+    '{': true,
+    '}': true,
+    '[': true,
+    ']': true,
+    ';': true,
+    '=': true,
+    ',': true,
+
+    '->': true,
+    '--': true
+  };
+
+  var dot = '';                   // current dot file
+  var index = 0;                  // current index in dot file
+  var c = '';                     // current token character in expr
+  var token = '';                 // current token
+  var tokenType = TOKENTYPE.NULL; // type of the token
+
+  /**
+   * Get the first character from the dot file.
+   * The character is stored into the char c. If the end of the dot file is
+   * reached, the function puts an empty string in c.
+   */
+  function first() {
+    index = 0;
+    c = dot.charAt(0);
+  }
+
+  /**
+   * Get the next character from the dot file.
+   * The character is stored into the char c. If the end of the dot file is
+   * reached, the function puts an empty string in c.
+   */
+  function next() {
+    index++;
+    c = dot.charAt(index);
+  }
+
+  /**
+   * Preview the next character from the dot file.
+   * @return {String} cNext
+   */
+  function nextPreview() {
+    return dot.charAt(index + 1);
+  }
+
+  /**
+   * Test whether given character is alphabetic or numeric
+   * @param {String} c
+   * @return {Boolean} isAlphaNumeric
+   */
+  var regexAlphaNumeric = /[a-zA-Z_0-9.:#]/;
+  function isAlphaNumeric(c) {
+    return regexAlphaNumeric.test(c);
+  }
+
+  /**
+   * Merge all properties of object b into object b
+   * @param {Object} a
+   * @param {Object} b
+   * @return {Object} a
+   */
+  function merge (a, b) {
+    if (!a) {
+      a = {};
+    }
+
+    if (b) {
+      for (var name in b) {
+        if (b.hasOwnProperty(name)) {
+          a[name] = b[name];
+        }
+      }
+    }
+    return a;
+  }
+
+  /**
+   * Set a value in an object, where the provided parameter name can be a
+   * path with nested parameters. For example:
+   *
+   *     var obj = {a: 2};
+   *     setValue(obj, 'b.c', 3);     // obj = {a: 2, b: {c: 3}}
+   *
+   * @param {Object} obj
+   * @param {String} path  A parameter name or dot-separated parameter path,
+   *                      like "color.highlight.border".
+   * @param {*} value
+   */
+  function setValue(obj, path, value) {
+    var keys = path.split('.');
+    var o = obj;
+    while (keys.length) {
+      var key = keys.shift();
+      if (keys.length) {
+        // this isn't the end point
+        if (!o[key]) {
+          o[key] = {};
+        }
+        o = o[key];
+      }
+      else {
+        // this is the end point
+        o[key] = value;
+      }
+    }
+  }
+
+  /**
+   * Add a node to a graph object. If there is already a node with
+   * the same id, their attributes will be merged.
+   * @param {Object} graph
+   * @param {Object} node
+   */
+  function addNode(graph, node) {
+    var i, len;
+    var current = null;
+
+    // find root graph (in case of subgraph)
+    var graphs = [graph]; // list with all graphs from current graph to root graph
+    var root = graph;
+    while (root.parent) {
+      graphs.push(root.parent);
+      root = root.parent;
+    }
+
+    // find existing node (at root level) by its id
+    if (root.nodes) {
+      for (i = 0, len = root.nodes.length; i < len; i++) {
+        if (node.id === root.nodes[i].id) {
+          current = root.nodes[i];
+          break;
+        }
+      }
+    }
+
+    if (!current) {
+      // this is a new node
+      current = {
+        id: node.id
+      };
+      if (graph.node) {
+        // clone default attributes
+        current.attr = merge(current.attr, graph.node);
+      }
+    }
+
+    // add node to this (sub)graph and all its parent graphs
+    for (i = graphs.length - 1; i >= 0; i--) {
+      var g = graphs[i];
+
+      if (!g.nodes) {
+        g.nodes = [];
+      }
+      if (g.nodes.indexOf(current) == -1) {
+        g.nodes.push(current);
+      }
+    }
+
+    // merge attributes
+    if (node.attr) {
+      current.attr = merge(current.attr, node.attr);
+    }
+  }
+
+  /**
+   * Add an edge to a graph object
+   * @param {Object} graph
+   * @param {Object} edge
+   */
+  function addEdge(graph, edge) {
+    if (!graph.edges) {
+      graph.edges = [];
+    }
+    graph.edges.push(edge);
+    if (graph.edge) {
+      var attr = merge({}, graph.edge);     // clone default attributes
+      edge.attr = merge(attr, edge.attr); // merge attributes
+    }
+  }
+
+  /**
+   * Create an edge to a graph object
+   * @param {Object} graph
+   * @param {String | Number | Object} from
+   * @param {String | Number | Object} to
+   * @param {String} type
+   * @param {Object | null} attr
+   * @return {Object} edge
+   */
+  function createEdge(graph, from, to, type, attr) {
+    var edge = {
+      from: from,
+      to: to,
+      type: type
+    };
+
+    if (graph.edge) {
+      edge.attr = merge({}, graph.edge);  // clone default attributes
+    }
+    edge.attr = merge(edge.attr || {}, attr); // merge attributes
+
+    return edge;
+  }
+
+  /**
+   * Get next token in the current dot file.
+   * The token and token type are available as token and tokenType
+   */
+  function getToken() {
+    tokenType = TOKENTYPE.NULL;
+    token = '';
+
+    // skip over whitespaces
+    while (c == ' ' || c == '\t' || c == '\n' || c == '\r') {  // space, tab, enter
+      next();
+    }
+
+    do {
+      var isComment = false;
+
+      // skip comment
+      if (c == '#') {
+        // find the previous non-space character
+        var i = index - 1;
+        while (dot.charAt(i) == ' ' || dot.charAt(i) == '\t') {
+          i--;
+        }
+        if (dot.charAt(i) == '\n' || dot.charAt(i) == '') {
+          // the # is at the start of a line, this is indeed a line comment
+          while (c != '' && c != '\n') {
+            next();
+          }
+          isComment = true;
+        }
+      }
+      if (c == '/' && nextPreview() == '/') {
+        // skip line comment
+        while (c != '' && c != '\n') {
+          next();
+        }
+        isComment = true;
+      }
+      if (c == '/' && nextPreview() == '*') {
+        // skip block comment
+        while (c != '') {
+          if (c == '*' && nextPreview() == '/') {
+            // end of block comment found. skip these last two characters
+            next();
+            next();
+            break;
+          }
+          else {
+            next();
+          }
+        }
+        isComment = true;
+      }
+
+      // skip over whitespaces
+      while (c == ' ' || c == '\t' || c == '\n' || c == '\r') {  // space, tab, enter
+        next();
+      }
+    }
+    while (isComment);
+
+    // check for end of dot file
+    if (c == '') {
+      // token is still empty
+      tokenType = TOKENTYPE.DELIMITER;
+      return;
+    }
+
+    // check for delimiters consisting of 2 characters
+    var c2 = c + nextPreview();
+    if (DELIMITERS[c2]) {
+      tokenType = TOKENTYPE.DELIMITER;
+      token = c2;
+      next();
+      next();
+      return;
+    }
+
+    // check for delimiters consisting of 1 character
+    if (DELIMITERS[c]) {
+      tokenType = TOKENTYPE.DELIMITER;
+      token = c;
+      next();
+      return;
+    }
+
+    // check for an identifier (number or string)
+    // TODO: more precise parsing of numbers/strings (and the port separator ':')
+    if (isAlphaNumeric(c) || c == '-') {
+      token += c;
+      next();
+
+      while (isAlphaNumeric(c)) {
+        token += c;
+        next();
+      }
+      if (token == 'false') {
+        token = false;   // convert to boolean
+      }
+      else if (token == 'true') {
+        token = true;   // convert to boolean
+      }
+      else if (!isNaN(Number(token))) {
+        token = Number(token); // convert to number
+      }
+      tokenType = TOKENTYPE.IDENTIFIER;
+      return;
+    }
+
+    // check for a string enclosed by double quotes
+    if (c == '"') {
+      next();
+      while (c != '' && (c != '"' || (c == '"' && nextPreview() == '"'))) {
+        token += c;
+        if (c == '"') { // skip the escape character
+          next();
+        }
+        next();
+      }
+      if (c != '"') {
+        throw newSyntaxError('End of string " expected');
+      }
+      next();
+      tokenType = TOKENTYPE.IDENTIFIER;
+      return;
+    }
+
+    // something unknown is found, wrong characters, a syntax error
+    tokenType = TOKENTYPE.UNKNOWN;
+    while (c != '') {
+      token += c;
+      next();
+    }
+    throw new SyntaxError('Syntax error in part "' + chop(token, 30) + '"');
+  }
+
+  /**
+   * Parse a graph.
+   * @returns {Object} graph
+   */
+  function parseGraph() {
+    var graph = {};
+
+    first();
+    getToken();
+
+    // optional strict keyword
+    if (token == 'strict') {
+      graph.strict = true;
+      getToken();
+    }
+
+    // graph or digraph keyword
+    if (token == 'graph' || token == 'digraph') {
+      graph.type = token;
+      getToken();
+    }
+
+    // optional graph id
+    if (tokenType == TOKENTYPE.IDENTIFIER) {
+      graph.id = token;
+      getToken();
+    }
+
+    // open angle bracket
+    if (token != '{') {
+      throw newSyntaxError('Angle bracket { expected');
+    }
+    getToken();
+
+    // statements
+    parseStatements(graph);
+
+    // close angle bracket
+    if (token != '}') {
+      throw newSyntaxError('Angle bracket } expected');
+    }
+    getToken();
+
+    // end of file
+    if (token !== '') {
+      throw newSyntaxError('End of file expected');
+    }
+    getToken();
+
+    // remove temporary default properties
+    delete graph.node;
+    delete graph.edge;
+    delete graph.graph;
+
+    return graph;
+  }
+
+  /**
+   * Parse a list with statements.
+   * @param {Object} graph
+   */
+  function parseStatements (graph) {
+    while (token !== '' && token != '}') {
+      parseStatement(graph);
+      if (token == ';') {
+        getToken();
+      }
+    }
+  }
+
+  /**
+   * Parse a single statement. Can be a an attribute statement, node
+   * statement, a series of node statements and edge statements, or a
+   * parameter.
+   * @param {Object} graph
+   */
+  function parseStatement(graph) {
+    // parse subgraph
+    var subgraph = parseSubgraph(graph);
+    if (subgraph) {
+      // edge statements
+      parseEdge(graph, subgraph);
+
+      return;
+    }
+
+    // parse an attribute statement
+    var attr = parseAttributeStatement(graph);
+    if (attr) {
+      return;
+    }
+
+    // parse node
+    if (tokenType != TOKENTYPE.IDENTIFIER) {
+      throw newSyntaxError('Identifier expected');
+    }
+    var id = token; // id can be a string or a number
+    getToken();
+
+    if (token == '=') {
+      // id statement
+      getToken();
+      if (tokenType != TOKENTYPE.IDENTIFIER) {
+        throw newSyntaxError('Identifier expected');
+      }
+      graph[id] = token;
+      getToken();
+      // TODO: implement comma separated list with "a_list: ID=ID [','] [a_list] "
+    }
+    else {
+      parseNodeStatement(graph, id);
+    }
+  }
+
+  /**
+   * Parse a subgraph
+   * @param {Object} graph    parent graph object
+   * @return {Object | null} subgraph
+   */
+  function parseSubgraph (graph) {
+    var subgraph = null;
+
+    // optional subgraph keyword
+    if (token == 'subgraph') {
+      subgraph = {};
+      subgraph.type = 'subgraph';
+      getToken();
+
+      // optional graph id
+      if (tokenType == TOKENTYPE.IDENTIFIER) {
+        subgraph.id = token;
+        getToken();
+      }
+    }
+
+    // open angle bracket
+    if (token == '{') {
+      getToken();
+
+      if (!subgraph) {
+        subgraph = {};
+      }
+      subgraph.parent = graph;
+      subgraph.node = graph.node;
+      subgraph.edge = graph.edge;
+      subgraph.graph = graph.graph;
+
+      // statements
+      parseStatements(subgraph);
+
+      // close angle bracket
+      if (token != '}') {
+        throw newSyntaxError('Angle bracket } expected');
+      }
+      getToken();
+
+      // remove temporary default properties
+      delete subgraph.node;
+      delete subgraph.edge;
+      delete subgraph.graph;
+      delete subgraph.parent;
+
+      // register at the parent graph
+      if (!graph.subgraphs) {
+        graph.subgraphs = [];
+      }
+      graph.subgraphs.push(subgraph);
+    }
+
+    return subgraph;
+  }
+
+  /**
+   * parse an attribute statement like "node [shape=circle fontSize=16]".
+   * Available keywords are 'node', 'edge', 'graph'.
+   * The previous list with default attributes will be replaced
+   * @param {Object} graph
+   * @returns {String | null} keyword Returns the name of the parsed attribute
+   *                                  (node, edge, graph), or null if nothing
+   *                                  is parsed.
+   */
+  function parseAttributeStatement (graph) {
+    // attribute statements
+    if (token == 'node') {
+      getToken();
+
+      // node attributes
+      graph.node = parseAttributeList();
+      return 'node';
+    }
+    else if (token == 'edge') {
+      getToken();
+
+      // edge attributes
+      graph.edge = parseAttributeList();
+      return 'edge';
+    }
+    else if (token == 'graph') {
+      getToken();
+
+      // graph attributes
+      graph.graph = parseAttributeList();
+      return 'graph';
+    }
+
+    return null;
+  }
+
+  /**
+   * parse a node statement
+   * @param {Object} graph
+   * @param {String | Number} id
+   */
+  function parseNodeStatement(graph, id) {
+    // node statement
+    var node = {
+      id: id
+    };
+    var attr = parseAttributeList();
+    if (attr) {
+      node.attr = attr;
+    }
+    addNode(graph, node);
+
+    // edge statements
+    parseEdge(graph, id);
+  }
+
+  /**
+   * Parse an edge or a series of edges
+   * @param {Object} graph
+   * @param {String | Number} from        Id of the from node
+   */
+  function parseEdge(graph, from) {
+    while (token == '->' || token == '--') {
+      var to;
+      var type = token;
+      getToken();
+
+      var subgraph = parseSubgraph(graph);
+      if (subgraph) {
+        to = subgraph;
+      }
+      else {
+        if (tokenType != TOKENTYPE.IDENTIFIER) {
+          throw newSyntaxError('Identifier or subgraph expected');
+        }
+        to = token;
+        addNode(graph, {
+          id: to
+        });
+        getToken();
+      }
+
+      // parse edge attributes
+      var attr = parseAttributeList();
+
+      // create edge
+      var edge = createEdge(graph, from, to, type, attr);
+      addEdge(graph, edge);
+
+      from = to;
+    }
+  }
+
+  /**
+   * Parse a set with attributes,
+   * for example [label="1.000", shape=solid]
+   * @return {Object | null} attr
+   */
+  function parseAttributeList() {
+    var attr = null;
+
+    while (token == '[') {
+      getToken();
+      attr = {};
+      while (token !== '' && token != ']') {
+        if (tokenType != TOKENTYPE.IDENTIFIER) {
+          throw newSyntaxError('Attribute name expected');
+        }
+        var name = token;
+
+        getToken();
+        if (token != '=') {
+          throw newSyntaxError('Equal sign = expected');
+        }
+        getToken();
+
+        if (tokenType != TOKENTYPE.IDENTIFIER) {
+          throw newSyntaxError('Attribute value expected');
+        }
+        var value = token;
+        setValue(attr, name, value); // name can be a path
+
+        getToken();
+        if (token ==',') {
+          getToken();
+        }
+      }
+
+      if (token != ']') {
+        throw newSyntaxError('Bracket ] expected');
+      }
+      getToken();
+    }
+
+    return attr;
+  }
+
+  /**
+   * Create a syntax error with extra information on current token and index.
+   * @param {String} message
+   * @returns {SyntaxError} err
+   */
+  function newSyntaxError(message) {
+    return new SyntaxError(message + ', got "' + chop(token, 30) + '" (char ' + index + ')');
+  }
+
+  /**
+   * Chop off text after a maximum length
+   * @param {String} text
+   * @param {Number} maxLength
+   * @returns {String}
+   */
+  function chop (text, maxLength) {
+    return (text.length <= maxLength) ? text : (text.substr(0, 27) + '...');
+  }
+
+  /**
+   * Execute a function fn for each pair of elements in two arrays
+   * @param {Array | *} array1
+   * @param {Array | *} array2
+   * @param {function} fn
+   */
+  function forEach2(array1, array2, fn) {
+    if (array1 instanceof Array) {
+      array1.forEach(function (elem1) {
+        if (array2 instanceof Array) {
+          array2.forEach(function (elem2)  {
+            fn(elem1, elem2);
+          });
+        }
+        else {
+          fn(elem1, array2);
+        }
+      });
+    }
+    else {
+      if (array2 instanceof Array) {
+        array2.forEach(function (elem2)  {
+          fn(array1, elem2);
+        });
+      }
+      else {
+        fn(array1, array2);
+      }
+    }
+  }
+
+  /**
+   * Convert a string containing a graph in DOT language into a map containing
+   * with nodes and edges in the format of graph.
+   * @param {String} data         Text containing a graph in DOT-notation
+   * @return {Object} graphData
+   */
+  function DOTToGraph (data) {
+    // parse the DOT file
+    var dotData = parseDOT(data);
+    var graphData = {
+      nodes: [],
+      edges: [],
+      options: {}
+    };
+
+    // copy the nodes
+    if (dotData.nodes) {
+      dotData.nodes.forEach(function (dotNode) {
+        var graphNode = {
+          id: dotNode.id,
+          label: String(dotNode.label || dotNode.id)
+        };
+        merge(graphNode, dotNode.attr);
+        if (graphNode.image) {
+          graphNode.shape = 'image';
+        }
+        graphData.nodes.push(graphNode);
+      });
+    }
+
+    // copy the edges
+    if (dotData.edges) {
+      /**
+       * Convert an edge in DOT format to an edge with VisGraph format
+       * @param {Object} dotEdge
+       * @returns {Object} graphEdge
+       */
+      function convertEdge(dotEdge) {
+        var graphEdge = {
+          from: dotEdge.from,
+          to: dotEdge.to
+        };
+        merge(graphEdge, dotEdge.attr);
+        graphEdge.style = (dotEdge.type == '->') ? 'arrow' : 'line';
+        return graphEdge;
+      }
+
+      dotData.edges.forEach(function (dotEdge) {
+        var from, to;
+        if (dotEdge.from instanceof Object) {
+          from = dotEdge.from.nodes;
+        }
+        else {
+          from = {
+            id: dotEdge.from
+          }
+        }
+
+        if (dotEdge.to instanceof Object) {
+          to = dotEdge.to.nodes;
+        }
+        else {
+          to = {
+            id: dotEdge.to
+          }
+        }
+
+        if (dotEdge.from instanceof Object && dotEdge.from.edges) {
+          dotEdge.from.edges.forEach(function (subEdge) {
+            var graphEdge = convertEdge(subEdge);
+            graphData.edges.push(graphEdge);
+          });
+        }
+
+        forEach2(from, to, function (from, to) {
+          var subEdge = createEdge(graphData, from.id, to.id, dotEdge.type, dotEdge.attr);
+          var graphEdge = convertEdge(subEdge);
+          graphData.edges.push(graphEdge);
+        });
+
+        if (dotEdge.to instanceof Object && dotEdge.to.edges) {
+          dotEdge.to.edges.forEach(function (subEdge) {
+            var graphEdge = convertEdge(subEdge);
+            graphData.edges.push(graphEdge);
+          });
+        }
+      });
+    }
+
+    // copy the options
+    if (dotData.attr) {
+      graphData.options = dotData.attr;
+    }
+
+    return graphData;
+  }
+
+  // exports
+  exports.parseDOT = parseDOT;
+  exports.DOTToGraph = DOTToGraph;
+
+})(typeof util !== 'undefined' ? util : exports);
+
+/**
+ * Canvas shapes used by the Graph
+ */
+if (typeof CanvasRenderingContext2D !== 'undefined') {
+
+  /**
+   * Draw a circle shape
+   */
+  CanvasRenderingContext2D.prototype.circle = function(x, y, r) {
+    this.beginPath();
+    this.arc(x, y, r, 0, 2*Math.PI, false);
+  };
+
+  /**
+   * Draw a square shape
+   * @param {Number} x horizontal center
+   * @param {Number} y vertical center
+   * @param {Number} r   size, width and height of the square
+   */
+  CanvasRenderingContext2D.prototype.square = function(x, y, r) {
+    this.beginPath();
+    this.rect(x - r, y - r, r * 2, r * 2);
+  };
+
+  /**
+   * Draw a triangle shape
+   * @param {Number} x horizontal center
+   * @param {Number} y vertical center
+   * @param {Number} r   radius, half the length of the sides of the triangle
+   */
+  CanvasRenderingContext2D.prototype.triangle = function(x, y, r) {
+    // http://en.wikipedia.org/wiki/Equilateral_triangle
+    this.beginPath();
+
+    var s = r * 2;
+    var s2 = s / 2;
+    var ir = Math.sqrt(3) / 6 * s;      // radius of inner circle
+    var h = Math.sqrt(s * s - s2 * s2); // height
+
+    this.moveTo(x, y - (h - ir));
+    this.lineTo(x + s2, y + ir);
+    this.lineTo(x - s2, y + ir);
+    this.lineTo(x, y - (h - ir));
+    this.closePath();
+  };
+
+  /**
+   * Draw a triangle shape in downward orientation
+   * @param {Number} x horizontal center
+   * @param {Number} y vertical center
+   * @param {Number} r radius
+   */
+  CanvasRenderingContext2D.prototype.triangleDown = function(x, y, r) {
+    // http://en.wikipedia.org/wiki/Equilateral_triangle
+    this.beginPath();
+
+    var s = r * 2;
+    var s2 = s / 2;
+    var ir = Math.sqrt(3) / 6 * s;      // radius of inner circle
+    var h = Math.sqrt(s * s - s2 * s2); // height
+
+    this.moveTo(x, y + (h - ir));
+    this.lineTo(x + s2, y - ir);
+    this.lineTo(x - s2, y - ir);
+    this.lineTo(x, y + (h - ir));
+    this.closePath();
+  };
+
+  /**
+   * Draw a star shape, a star with 5 points
+   * @param {Number} x horizontal center
+   * @param {Number} y vertical center
+   * @param {Number} r   radius, half the length of the sides of the triangle
+   */
+  CanvasRenderingContext2D.prototype.star = function(x, y, r) {
+    // http://www.html5canvastutorials.com/labs/html5-canvas-star-spinner/
+    this.beginPath();
+
+    for (var n = 0; n < 10; n++) {
+      var radius = (n % 2 === 0) ? r * 1.3 : r * 0.5;
+      this.lineTo(
+          x + radius * Math.sin(n * 2 * Math.PI / 10),
+          y - radius * Math.cos(n * 2 * Math.PI / 10)
+      );
+    }
+
+    this.closePath();
+  };
+
+  /**
+   * http://stackoverflow.com/questions/1255512/how-to-draw-a-rounded-rectangle-on-html-canvas
+   */
+  CanvasRenderingContext2D.prototype.roundRect = function(x, y, w, h, r) {
+    var r2d = Math.PI/180;
+    if( w - ( 2 * r ) < 0 ) { r = ( w / 2 ); } //ensure that the radius isn't too large for x
+    if( h - ( 2 * r ) < 0 ) { r = ( h / 2 ); } //ensure that the radius isn't too large for y
+    this.beginPath();
+    this.moveTo(x+r,y);
+    this.lineTo(x+w-r,y);
+    this.arc(x+w-r,y+r,r,r2d*270,r2d*360,false);
+    this.lineTo(x+w,y+h-r);
+    this.arc(x+w-r,y+h-r,r,0,r2d*90,false);
+    this.lineTo(x+r,y+h);
+    this.arc(x+r,y+h-r,r,r2d*90,r2d*180,false);
+    this.lineTo(x,y+r);
+    this.arc(x+r,y+r,r,r2d*180,r2d*270,false);
+  };
+
+  /**
+   * http://stackoverflow.com/questions/2172798/how-to-draw-an-oval-in-html5-canvas
+   */
+  CanvasRenderingContext2D.prototype.ellipse = function(x, y, w, h) {
+    var kappa = .5522848,
+        ox = (w / 2) * kappa, // control point offset horizontal
+        oy = (h / 2) * kappa, // control point offset vertical
+        xe = x + w,           // x-end
+        ye = y + h,           // y-end
+        xm = x + w / 2,       // x-middle
+        ym = y + h / 2;       // y-middle
+
+    this.beginPath();
+    this.moveTo(x, ym);
+    this.bezierCurveTo(x, ym - oy, xm - ox, y, xm, y);
+    this.bezierCurveTo(xm + ox, y, xe, ym - oy, xe, ym);
+    this.bezierCurveTo(xe, ym + oy, xm + ox, ye, xm, ye);
+    this.bezierCurveTo(xm - ox, ye, x, ym + oy, x, ym);
+  };
+
+
+
+  /**
+   * http://stackoverflow.com/questions/2172798/how-to-draw-an-oval-in-html5-canvas
+   */
+  CanvasRenderingContext2D.prototype.database = function(x, y, w, h) {
+    var f = 1/3;
+    var wEllipse = w;
+    var hEllipse = h * f;
+
+    var kappa = .5522848,
+        ox = (wEllipse / 2) * kappa, // control point offset horizontal
+        oy = (hEllipse / 2) * kappa, // control point offset vertical
+        xe = x + wEllipse,           // x-end
+        ye = y + hEllipse,           // y-end
+        xm = x + wEllipse / 2,       // x-middle
+        ym = y + hEllipse / 2,       // y-middle
+        ymb = y + (h - hEllipse/2),  // y-midlle, bottom ellipse
+        yeb = y + h;                 // y-end, bottom ellipse
+
+    this.beginPath();
+    this.moveTo(xe, ym);
+
+    this.bezierCurveTo(xe, ym + oy, xm + ox, ye, xm, ye);
+    this.bezierCurveTo(xm - ox, ye, x, ym + oy, x, ym);
+
+    this.bezierCurveTo(x, ym - oy, xm - ox, y, xm, y);
+    this.bezierCurveTo(xm + ox, y, xe, ym - oy, xe, ym);
+
+    this.lineTo(xe, ymb);
+
+    this.bezierCurveTo(xe, ymb + oy, xm + ox, yeb, xm, yeb);
+    this.bezierCurveTo(xm - ox, yeb, x, ymb + oy, x, ymb);
+
+    this.lineTo(x, ym);
+  };
+
+
+  /**
+   * Draw an arrow point (no line)
+   */
+  CanvasRenderingContext2D.prototype.arrow = function(x, y, angle, length) {
+    // tail
+    var xt = x - length * Math.cos(angle);
+    var yt = y - length * Math.sin(angle);
+
+    // inner tail
+    // TODO: allow to customize different shapes
+    var xi = x - length * 0.9 * Math.cos(angle);
+    var yi = y - length * 0.9 * Math.sin(angle);
+
+    // left
+    var xl = xt + length / 3 * Math.cos(angle + 0.5 * Math.PI);
+    var yl = yt + length / 3 * Math.sin(angle + 0.5 * Math.PI);
+
+    // right
+    var xr = xt + length / 3 * Math.cos(angle - 0.5 * Math.PI);
+    var yr = yt + length / 3 * Math.sin(angle - 0.5 * Math.PI);
+
+    this.beginPath();
+    this.moveTo(x, y);
+    this.lineTo(xl, yl);
+    this.lineTo(xi, yi);
+    this.lineTo(xr, yr);
+    this.closePath();
+  };
+
+  /**
+   * Sets up the dashedLine functionality for drawing
+   * Original code came from http://stackoverflow.com/questions/4576724/dotted-stroke-in-canvas
+   * @author David Jordan
+   * @date 2012-08-08
+   */
+  CanvasRenderingContext2D.prototype.dashedLine = function(x,y,x2,y2,dashArray){
+    if (!dashArray) dashArray=[10,5];
+    if (dashLength==0) dashLength = 0.001; // Hack for Safari
+    var dashCount = dashArray.length;
+    this.moveTo(x, y);
+    var dx = (x2-x), dy = (y2-y);
+    var slope = dy/dx;
+    var distRemaining = Math.sqrt( dx*dx + dy*dy );
+    var dashIndex=0, draw=true;
+    while (distRemaining>=0.1){
+      var dashLength = dashArray[dashIndex++%dashCount];
+      if (dashLength > distRemaining) dashLength = distRemaining;
+      var xStep = Math.sqrt( dashLength*dashLength / (1 + slope*slope) );
+      if (dx<0) xStep = -xStep;
+      x += xStep;
+      y += slope*xStep;
+      this[draw ? 'lineTo' : 'moveTo'](x,y);
+      distRemaining -= dashLength;
+      draw = !draw;
+    }
+  };
+
+  // TODO: add diamond shape
+}
+
+/**
+ * @class Node
+ * A node. A node can be connected to other nodes via one or multiple edges.
+ * @param {object} properties An object containing properties for the node. All
+ *                            properties are optional, except for the id.
+ *                              {number} id     Id of the node. Required
+ *                              {string} label  Text label for the node
+ *                              {number} x      Horizontal position of the node
+ *                              {number} y      Vertical position of the node
+ *                              {string} shape  Node shape, available:
+ *                                              "database", "circle", "ellipse",
+ *                                              "box", "image", "text", "dot",
+ *                                              "star", "triangle", "triangleDown",
+ *                                              "square"
+ *                              {string} image  An image url
+ *                              {string} title  An title text, can be HTML
+ *                              {anytype} group A group name or number
+ * @param {Graph.Images} imagelist    A list with images. Only needed
+ *                                            when the node has an image
+ * @param {Graph.Groups} grouplist    A list with groups. Needed for
+ *                                            retrieving group properties
+ * @param {Object}               constants    An object with default values for
+ *                                            example for the color
+ */
+function Node(properties, imagelist, grouplist, constants) {
+  this.selected = false;
+
+  this.edges = []; // all edges connected to this node
+  this.group = constants.nodes.group;
+
+  this.fontSize = constants.nodes.fontSize;
+  this.fontFace = constants.nodes.fontFace;
+  this.fontColor = constants.nodes.fontColor;
+
+  this.color = constants.nodes.color;
+
+  // set defaults for the properties
+  this.id = undefined;
+  this.shape = constants.nodes.shape;
+  this.image = constants.nodes.image;
+  this.x = 0;
+  this.y = 0;
+  this.xFixed = false;
+  this.yFixed = false;
+  this.radius = constants.nodes.radius;
+  this.radiusFixed = false;
+  this.radiusMin = constants.nodes.radiusMin;
+  this.radiusMax = constants.nodes.radiusMax;
+
+  this.imagelist = imagelist;
+  this.grouplist = grouplist;
+
+  this.setProperties(properties, constants);
+
+  // mass, force, velocity
+  this.mass = 50;  // kg (mass is adjusted for the number of connected edges)
+  this.fx = 0.0;  // external force x
+  this.fy = 0.0;  // external force y
+  this.vx = 0.0;  // velocity x
+  this.vy = 0.0;  // velocity y
+  this.minForce = constants.minForce;
+  this.damping = 0.9; // damping factor
+};
+
+/**
+ * Attach a edge to the node
+ * @param {Edge} edge
+ */
+Node.prototype.attachEdge = function(edge) {
+  if (this.edges.indexOf(edge) == -1) {
+    this.edges.push(edge);
+  }
+  this._updateMass();
+};
+
+/**
+ * Detach a edge from the node
+ * @param {Edge} edge
+ */
+Node.prototype.detachEdge = function(edge) {
+  var index = this.edges.indexOf(edge);
+  if (index != -1) {
+    this.edges.splice(index, 1);
+  }
+  this._updateMass();
+};
+
+/**
+ * Update the nodes mass, which is determined by the number of edges connecting
+ * to it (more edges -> heavier node).
+ * @private
+ */
+Node.prototype._updateMass = function() {
+  this.mass = 50 + 20 * this.edges.length; // kg
+};
+
+/**
+ * Set or overwrite properties for the node
+ * @param {Object} properties an object with properties
+ * @param {Object} constants  and object with default, global properties
+ */
+Node.prototype.setProperties = function(properties, constants) {
+  if (!properties) {
+    return;
+  }
+
+  // basic properties
+  if (properties.id != undefined)        {this.id = properties.id;}
+  if (properties.label != undefined)     {this.label = properties.label;}
+  if (properties.title != undefined)     {this.title = properties.title;}
+  if (properties.group != undefined)     {this.group = properties.group;}
+  if (properties.x != undefined)         {this.x = properties.x;}
+  if (properties.y != undefined)         {this.y = properties.y;}
+  if (properties.value != undefined)     {this.value = properties.value;}
+
+  if (this.id === undefined) {
+    throw "Node must have an id";
+  }
+
+  // copy group properties
+  if (this.group) {
+    var groupObj = this.grouplist.get(this.group);
+    for (var prop in groupObj) {
+      if (groupObj.hasOwnProperty(prop)) {
+        this[prop] = groupObj[prop];
+      }
+    }
+  }
+
+  // individual shape properties
+  if (properties.shape != undefined)          {this.shape = properties.shape;}
+  if (properties.image != undefined)          {this.image = properties.image;}
+  if (properties.radius != undefined)         {this.radius = properties.radius;}
+  if (properties.color != undefined)          {this.color = Node.parseColor(properties.color);}
+
+  if (properties.fontColor != undefined)      {this.fontColor = properties.fontColor;}
+  if (properties.fontSize != undefined)       {this.fontSize = properties.fontSize;}
+  if (properties.fontFace != undefined)       {this.fontFace = properties.fontFace;}
+
+
+  if (this.image != undefined) {
+    if (this.imagelist) {
+      this.imageObj = this.imagelist.load(this.image);
+    }
+    else {
+      throw "No imagelist provided";
+    }
+  }
+
+  this.xFixed = this.xFixed || (properties.x != undefined);
+  this.yFixed = this.yFixed || (properties.y != undefined);
+  this.radiusFixed = this.radiusFixed || (properties.radius != undefined);
+
+  if (this.shape == 'image') {
+    this.radiusMin = constants.nodes.widthMin;
+    this.radiusMax = constants.nodes.widthMax;
+  }
+
+  // choose draw method depending on the shape
+  switch (this.shape) {
+    case 'database':      this.draw = this._drawDatabase; this.resize = this._resizeDatabase; break;
+    case 'box':           this.draw = this._drawBox; this.resize = this._resizeBox; break;
+    case 'circle':        this.draw = this._drawCircle; this.resize = this._resizeCircle; break;
+    case 'ellipse':       this.draw = this._drawEllipse; this.resize = this._resizeEllipse; break;
+    // TODO: add diamond shape
+    case 'image':         this.draw = this._drawImage; this.resize = this._resizeImage; break;
+    case 'text':          this.draw = this._drawText; this.resize = this._resizeText; break;
+    case 'dot':           this.draw = this._drawDot; this.resize = this._resizeShape; break;
+    case 'square':        this.draw = this._drawSquare; this.resize = this._resizeShape; break;
+    case 'triangle':      this.draw = this._drawTriangle; this.resize = this._resizeShape; break;
+    case 'triangleDown':  this.draw = this._drawTriangleDown; this.resize = this._resizeShape; break;
+    case 'star':          this.draw = this._drawStar; this.resize = this._resizeShape; break;
+    default:              this.draw = this._drawEllipse; this.resize = this._resizeEllipse; break;
+  }
+
+  // reset the size of the node, this can be changed
+  this._reset();
+};
+
+/**
+ * Parse a color property into an object with border, background, and
+ * hightlight colors
+ * @param {Object | String} color
+ * @return {Object} colorObject
+ */
+Node.parseColor = function(color) {
+  var c;
+  if (util.isString(color)) {
+    c = {
+      border: color,
+      background: color,
+      highlight: {
+        border: color,
+        background: color
+      }
+    };
+    // TODO: automatically generate a nice highlight color
+  }
+  else {
+    c = {};
+    c.background = color.background || 'white';
+    c.border = color.border || c.background;
+    if (util.isString(color.highlight)) {
+      c.highlight = {
+        border: color.highlight,
+        background: color.highlight
+      }
+    }
+    else {
+      c.highlight = {};
+      c.highlight.background = color.highlight && color.highlight.background || c.background;
+      c.highlight.border = color.highlight && color.highlight.border || c.border;
+    }
+  }
+  return c;
+};
+
+/**
+ * select this node
+ */
+Node.prototype.select = function() {
+  this.selected = true;
+  this._reset();
+};
+
+/**
+ * unselect this node
+ */
+Node.prototype.unselect = function() {
+  this.selected = false;
+  this._reset();
+};
+
+/**
+ * Reset the calculated size of the node, forces it to recalculate its size
+ * @private
+ */
+Node.prototype._reset = function() {
+  this.width = undefined;
+  this.height = undefined;
+};
+
+/**
+ * get the title of this node.
+ * @return {string} title    The title of the node, or undefined when no title
+ *                           has been set.
+ */
+Node.prototype.getTitle = function() {
+  return this.title;
+};
+
+/**
+ * Calculate the distance to the border of the Node
+ * @param {CanvasRenderingContext2D}   ctx
+ * @param {Number} angle        Angle in radians
+ * @returns {number} distance   Distance to the border in pixels
+ */
+Node.prototype.distanceToBorder = function (ctx, angle) {
+  var borderWidth = 1;
+
+  if (!this.width) {
+    this.resize(ctx);
+  }
+
+  //noinspection FallthroughInSwitchStatementJS
+  switch (this.shape) {
+    case 'circle':
+    case 'dot':
+      return this.radius + borderWidth;
+
+    case 'ellipse':
+      var a = this.width / 2;
+      var b = this.height / 2;
+      var w = (Math.sin(angle) * a);
+      var h = (Math.cos(angle) * b);
+      return a * b / Math.sqrt(w * w + h * h);
+
+    // TODO: implement distanceToBorder for database
+    // TODO: implement distanceToBorder for triangle
+    // TODO: implement distanceToBorder for triangleDown
+
+    case 'box':
+    case 'image':
+    case 'text':
+    default:
+      if (this.width) {
+        return Math.min(
+            Math.abs(this.width / 2 / Math.cos(angle)),
+            Math.abs(this.height / 2 / Math.sin(angle))) + borderWidth;
+        // TODO: reckon with border radius too in case of box
+      }
+      else {
+        return 0;
+      }
+
+  }
+
+  // TODO: implement calculation of distance to border for all shapes
+};
+
+/**
+ * Set forces acting on the node
+ * @param {number} fx   Force in horizontal direction
+ * @param {number} fy   Force in vertical direction
+ */
+Node.prototype._setForce = function(fx, fy) {
+  this.fx = fx;
+  this.fy = fy;
+};
+
+/**
+ * Add forces acting on the node
+ * @param {number} fx   Force in horizontal direction
+ * @param {number} fy   Force in vertical direction
+ * @private
+ */
+Node.prototype._addForce = function(fx, fy) {
+  this.fx += fx;
+  this.fy += fy;
+};
+
+/**
+ * Perform one discrete step for the node
+ * @param {number} interval    Time interval in seconds
+ */
+Node.prototype.discreteStep = function(interval) {
+  if (!this.xFixed) {
+    var dx   = -this.damping * this.vx;     // damping force
+    var ax   = (this.fx + dx) / this.mass;  // acceleration
+    this.vx += ax / interval;               // velocity
+    this.x  += this.vx / interval;          // position
+  }
+
+  if (!this.yFixed) {
+    var dy   = -this.damping * this.vy;     // damping force
+    var ay   = (this.fy + dy) / this.mass;  // acceleration
+    this.vy += ay / interval;               // velocity
+    this.y  += this.vy / interval;          // position
+  }
+};
+
+
+/**
+ * Check if this node has a fixed x and y position
+ * @return {boolean}      true if fixed, false if not
+ */
+Node.prototype.isFixed = function() {
+  return (this.xFixed && this.yFixed);
+};
+
+/**
+ * Check if this node is moving
+ * @param {number} vmin   the minimum velocity considered as "moving"
+ * @return {boolean}      true if moving, false if it has no velocity
+ */
+// TODO: replace this method with calculating the kinetic energy
+Node.prototype.isMoving = function(vmin) {
+  return (Math.abs(this.vx) > vmin || Math.abs(this.vy) > vmin ||
+      (!this.xFixed && Math.abs(this.fx) > this.minForce) ||
+      (!this.yFixed && Math.abs(this.fy) > this.minForce));
+};
+
+/**
+ * check if this node is selecte
+ * @return {boolean} selected   True if node is selected, else false
+ */
+Node.prototype.isSelected = function() {
+  return this.selected;
+};
+
+/**
+ * Retrieve the value of the node. Can be undefined
+ * @return {Number} value
+ */
+Node.prototype.getValue = function() {
+  return this.value;
+};
+
+/**
+ * Calculate the distance from the nodes location to the given location (x,y)
+ * @param {Number} x
+ * @param {Number} y
+ * @return {Number} value
+ */
+Node.prototype.getDistance = function(x, y) {
+  var dx = this.x - x,
+      dy = this.y - y;
+  return Math.sqrt(dx * dx + dy * dy);
+};
+
+
+/**
+ * Adjust the value range of the node. The node will adjust it's radius
+ * based on its value.
+ * @param {Number} min
+ * @param {Number} max
+ */
+Node.prototype.setValueRange = function(min, max) {
+  if (!this.radiusFixed && this.value !== undefined) {
+    if (max == min) {
+      this.radius = (this.radiusMin + this.radiusMax) / 2;
+    }
+    else {
+      var scale = (this.radiusMax - this.radiusMin) / (max - min);
+      this.radius = (this.value - min) * scale + this.radiusMin;
+    }
+  }
+};
+
+/**
+ * Draw this node in the given canvas
+ * The 2d context of a HTML canvas can be retrieved by canvas.getContext("2d");
+ * @param {CanvasRenderingContext2D}   ctx
+ */
+Node.prototype.draw = function(ctx) {
+  throw "Draw method not initialized for node";
+};
+
+/**
+ * Recalculate the size of this node in the given canvas
+ * The 2d context of a HTML canvas can be retrieved by canvas.getContext("2d");
+ * @param {CanvasRenderingContext2D}   ctx
+ */
+Node.prototype.resize = function(ctx) {
+  throw "Resize method not initialized for node";
+};
+
+/**
+ * Check if this object is overlapping with the provided object
+ * @param {Object} obj   an object with parameters left, top, right, bottom
+ * @return {boolean}     True if location is located on node
+ */
+Node.prototype.isOverlappingWith = function(obj) {
+  return (this.left          < obj.right &&
+      this.left + this.width > obj.left &&
+      this.top               < obj.bottom &&
+      this.top + this.height > obj.top);
+};
+
+Node.prototype._resizeImage = function (ctx) {
+  // TODO: pre calculate the image size
+  if (!this.width) {  // undefined or 0
+    var width, height;
+    if (this.value) {
+      var scale = this.imageObj.height / this.imageObj.width;
+      width = this.radius || this.imageObj.width;
+      height = this.radius * scale || this.imageObj.height;
+    }
+    else {
+      width = this.imageObj.width;
+      height = this.imageObj.height;
+    }
+    this.width  = width;
+    this.height = height;
+  }
+};
+
+Node.prototype._drawImage = function (ctx) {
+  this._resizeImage(ctx);
+
+  this.left   = this.x - this.width / 2;
+  this.top    = this.y - this.height / 2;
+
+  var yLabel;
+  if (this.imageObj) {
+    ctx.drawImage(this.imageObj, this.left, this.top, this.width, this.height);
+    yLabel = this.y + this.height / 2;
+  }
+  else {
+    // image still loading... just draw the label for now
+    yLabel = this.y;
+  }
+
+  this._label(ctx, this.label, this.x, yLabel, undefined, "top");
+};
+
+
+Node.prototype._resizeBox = function (ctx) {
+  if (!this.width) {
+    var margin = 5;
+    var textSize = this.getTextSize(ctx);
+    this.width = textSize.width + 2 * margin;
+    this.height = textSize.height + 2 * margin;
+  }
+};
+
+Node.prototype._drawBox = function (ctx) {
+  this._resizeBox(ctx);
+
+  this.left = this.x - this.width / 2;
+  this.top = this.y - this.height / 2;
+
+  ctx.strokeStyle = this.selected ? this.color.highlight.border : this.color.border;
+  ctx.fillStyle = this.selected ? this.color.highlight.background : this.color.background;
+  ctx.lineWidth = this.selected ? 2.0 : 1.0;
+  ctx.roundRect(this.left, this.top, this.width, this.height, this.radius);
+  ctx.fill();
+  ctx.stroke();
+
+  this._label(ctx, this.label, this.x, this.y);
+};
+
+
+Node.prototype._resizeDatabase = function (ctx) {
+  if (!this.width) {
+    var margin = 5;
+    var textSize = this.getTextSize(ctx);
+    var size = textSize.width + 2 * margin;
+    this.width = size;
+    this.height = size;
+  }
+};
+
+Node.prototype._drawDatabase = function (ctx) {
+  this._resizeDatabase(ctx);
+  this.left = this.x - this.width / 2;
+  this.top = this.y - this.height / 2;
+
+  ctx.strokeStyle = this.selected ? this.color.highlight.border : this.color.border;
+  ctx.fillStyle = this.selected ? this.color.highlight.background : this.color.background;
+  ctx.lineWidth = this.selected ? 2.0 : 1.0;
+  ctx.database(this.x - this.width/2, this.y - this.height*0.5, this.width, this.height);
+  ctx.fill();
+  ctx.stroke();
+
+  this._label(ctx, this.label, this.x, this.y);
+};
+
+
+Node.prototype._resizeCircle = function (ctx) {
+  if (!this.width) {
+    var margin = 5;
+    var textSize = this.getTextSize(ctx);
+    var diameter = Math.max(textSize.width, textSize.height) + 2 * margin;
+    this.radius = diameter / 2;
+
+    this.width = diameter;
+    this.height = diameter;
+  }
+};
+
+Node.prototype._drawCircle = function (ctx) {
+  this._resizeCircle(ctx);
+  this.left = this.x - this.width / 2;
+  this.top = this.y - this.height / 2;
+
+  ctx.strokeStyle = this.selected ? this.color.highlight.border : this.color.border;
+  ctx.fillStyle = this.selected ? this.color.highlight.background : this.color.background;
+  ctx.lineWidth = this.selected ? 2.0 : 1.0;
+  ctx.circle(this.x, this.y, this.radius);
+  ctx.fill();
+  ctx.stroke();
+
+  this._label(ctx, this.label, this.x, this.y);
+};
+
+Node.prototype._resizeEllipse = function (ctx) {
+  if (!this.width) {
+    var textSize = this.getTextSize(ctx);
+
+    this.width = textSize.width * 1.5;
+    this.height = textSize.height * 2;
+    if (this.width < this.height) {
+      this.width = this.height;
+    }
+  }
+};
+
+Node.prototype._drawEllipse = function (ctx) {
+  this._resizeEllipse(ctx);
+  this.left = this.x - this.width / 2;
+  this.top = this.y - this.height / 2;
+
+  ctx.strokeStyle = this.selected ? this.color.highlight.border : this.color.border;
+  ctx.fillStyle = this.selected ? this.color.highlight.background : this.color.background;
+  ctx.lineWidth = this.selected ? 2.0 : 1.0;
+  ctx.ellipse(this.left, this.top, this.width, this.height);
+  ctx.fill();
+  ctx.stroke();
+
+  this._label(ctx, this.label, this.x, this.y);
+};
+
+Node.prototype._drawDot = function (ctx) {
+  this._drawShape(ctx, 'circle');
+};
+
+Node.prototype._drawTriangle = function (ctx) {
+  this._drawShape(ctx, 'triangle');
+};
+
+Node.prototype._drawTriangleDown = function (ctx) {
+  this._drawShape(ctx, 'triangleDown');
+};
+
+Node.prototype._drawSquare = function (ctx) {
+  this._drawShape(ctx, 'square');
+};
+
+Node.prototype._drawStar = function (ctx) {
+  this._drawShape(ctx, 'star');
+};
+
+Node.prototype._resizeShape = function (ctx) {
+  if (!this.width) {
+    var size = 2 * this.radius;
+    this.width = size;
+    this.height = size;
+  }
+};
+
+Node.prototype._drawShape = function (ctx, shape) {
+  this._resizeShape(ctx);
+
+  this.left = this.x - this.width / 2;
+  this.top = this.y - this.height / 2;
+
+  ctx.strokeStyle = this.selected ? this.color.highlight.border : this.color.border;
+  ctx.fillStyle = this.selected ? this.color.highlight.background : this.color.background;
+  ctx.lineWidth = this.selected ? 2.0 : 1.0;
+
+  ctx[shape](this.x, this.y, this.radius);
+  ctx.fill();
+  ctx.stroke();
+
+  if (this.label) {
+    this._label(ctx, this.label, this.x, this.y + this.height / 2, undefined, 'top');
+  }
+};
+
+Node.prototype._resizeText = function (ctx) {
+  if (!this.width) {
+    var margin = 5;
+    var textSize = this.getTextSize(ctx);
+    this.width = textSize.width + 2 * margin;
+    this.height = textSize.height + 2 * margin;
+  }
+};
+
+Node.prototype._drawText = function (ctx) {
+  this._resizeText(ctx);
+  this.left = this.x - this.width / 2;
+  this.top = this.y - this.height / 2;
+
+  this._label(ctx, this.label, this.x, this.y);
+};
+
+
+Node.prototype._label = function (ctx, text, x, y, align, baseline) {
+  if (text) {
+    ctx.font = (this.selected ? "bold " : "") + this.fontSize + "px " + this.fontFace;
+    ctx.fillStyle = this.fontColor || "black";
+    ctx.textAlign = align || "center";
+    ctx.textBaseline = baseline || "middle";
+
+    var lines = text.split('\n'),
+        lineCount = lines.length,
+        fontSize = (this.fontSize + 4),
+        yLine = y + (1 - lineCount) / 2 * fontSize;
+
+    for (var i = 0; i < lineCount; i++) {
+      ctx.fillText(lines[i], x, yLine);
+      yLine += fontSize;
+    }
+  }
+};
+
+
+Node.prototype.getTextSize = function(ctx) {
+  if (this.label != undefined) {
+    ctx.font = (this.selected ? "bold " : "") + this.fontSize + "px " + this.fontFace;
+
+    var lines = this.label.split('\n'),
+        height = (this.fontSize + 4) * lines.length,
+        width = 0;
+
+    for (var i = 0, iMax = lines.length; i < iMax; i++) {
+      width = Math.max(width, ctx.measureText(lines[i]).width);
+    }
+
+    return {"width": width, "height": height};
+  }
+  else {
+    return {"width": 0, "height": 0};
+  }
+};
+
+/**
+ * @class Edge
+ *
+ * A edge connects two nodes
+ * @param {Object} properties     Object with properties. Must contain
+ *                                At least properties from and to.
+ *                                Available properties: from (number),
+ *                                to (number), label (string, color (string),
+ *                                width (number), style (string),
+ *                                length (number), title (string)
+ * @param {Graph} graph A graph object, used to find and edge to
+ *                                nodes.
+ * @param {Object} constants      An object with default values for
+ *                                example for the color
+ */
+function Edge (properties, graph, constants) {
+  if (!graph) {
+    throw "No graph provided";
+  }
+  this.graph = graph;
+
+  // initialize constants
+  this.widthMin = constants.edges.widthMin;
+  this.widthMax = constants.edges.widthMax;
+
+  // initialize variables
+  this.id     = undefined;
+  this.fromId = undefined;
+  this.toId = undefined;
+  this.style  = constants.edges.style;
+  this.title  = undefined;
+  this.width  = constants.edges.width;
+  this.value  = undefined;
+  this.length = constants.edges.length;
+
+  this.from = null;   // a node
+  this.to = null;     // a node
+  this.connected = false;
+
+  // Added to support dashed lines
+  // David Jordan
+  // 2012-08-08
+  this.dash = util.extend({}, constants.edges.dash); // contains properties length, gap, altLength
+
+  this.stiffness   = undefined; // depends on the length of the edge
+  this.color       = constants.edges.color;
+  this.widthFixed  = false;
+  this.lengthFixed = false;
+
+  this.setProperties(properties, constants);
+}
+
+/**
+ * Set or overwrite properties for the edge
+ * @param {Object} properties  an object with properties
+ * @param {Object} constants   and object with default, global properties
+ */
+Edge.prototype.setProperties = function(properties, constants) {
+  if (!properties) {
+    return;
+  }
+
+  if (properties.from != undefined)           {this.fromId = properties.from;}
+  if (properties.to != undefined)             {this.toId = properties.to;}
+
+  if (properties.id != undefined)             {this.id = properties.id;}
+  if (properties.style != undefined)          {this.style = properties.style;}
+  if (properties.label != undefined)          {this.label = properties.label;}
+  if (this.label) {
+    this.fontSize = constants.edges.fontSize;
+    this.fontFace = constants.edges.fontFace;
+    this.fontColor = constants.edges.fontColor;
+    if (properties.fontColor != undefined)  {this.fontColor = properties.fontColor;}
+    if (properties.fontSize != undefined)   {this.fontSize = properties.fontSize;}
+    if (properties.fontFace != undefined)   {this.fontFace = properties.fontFace;}
+  }
+  if (properties.title != undefined)          {this.title = properties.title;}
+  if (properties.width != undefined)          {this.width = properties.width;}
+  if (properties.value != undefined)          {this.value = properties.value;}
+  if (properties.length != undefined)         {this.length = properties.length;}
+
+  // Added to support dashed lines
+  // David Jordan
+  // 2012-08-08
+  if (properties.dash) {
+    if (properties.dash.length != undefined)    {this.dash.length = properties.dash.length;}
+    if (properties.dash.gap != undefined)       {this.dash.gap = properties.dash.gap;}
+    if (properties.dash.altLength != undefined) {this.dash.altLength = properties.dash.altLength;}
+  }
+
+  if (properties.color != undefined) {this.color = properties.color;}
+
+  // A node is connected when it has a from and to node.
+  this.connect();
+
+  this.widthFixed = this.widthFixed || (properties.width != undefined);
+  this.lengthFixed = this.lengthFixed || (properties.length != undefined);
+  this.stiffness = 1 / this.length;
+
+  // set draw method based on style
+  switch (this.style) {
+    case 'line':          this.draw = this._drawLine; break;
+    case 'arrow':         this.draw = this._drawArrow; break;
+    case 'arrow-center':  this.draw = this._drawArrowCenter; break;
+    case 'dash-line':     this.draw = this._drawDashLine; break;
+    default:              this.draw = this._drawLine; break;
+  }
+};
+
+/**
+ * Connect an edge to its nodes
+ */
+Edge.prototype.connect = function () {
+  this.disconnect();
+
+  this.from = this.graph.nodes[this.fromId] || null;
+  this.to = this.graph.nodes[this.toId] || null;
+  this.connected = (this.from && this.to);
+
+  if (this.connected) {
+    this.from.attachEdge(this);
+    this.to.attachEdge(this);
+  }
+  else {
+    if (this.from) {
+      this.from.detachEdge(this);
+    }
+    if (this.to) {
+      this.to.detachEdge(this);
+    }
+  }
+};
+
+/**
+ * Disconnect an edge from its nodes
+ */
+Edge.prototype.disconnect = function () {
+  if (this.from) {
+    this.from.detachEdge(this);
+    this.from = null;
+  }
+  if (this.to) {
+    this.to.detachEdge(this);
+    this.to = null;
+  }
+
+  this.connected = false;
+};
+
+/**
+ * get the title of this edge.
+ * @return {string} title    The title of the edge, or undefined when no title
+ *                           has been set.
+ */
+Edge.prototype.getTitle = function() {
+  return this.title;
+};
+
+
+/**
+ * Retrieve the value of the edge. Can be undefined
+ * @return {Number} value
+ */
+Edge.prototype.getValue = function() {
+  return this.value;
+};
+
+/**
+ * Adjust the value range of the edge. The edge will adjust it's width
+ * based on its value.
+ * @param {Number} min
+ * @param {Number} max
+ */
+Edge.prototype.setValueRange = function(min, max) {
+  if (!this.widthFixed && this.value !== undefined) {
+    var scale = (this.widthMax - this.widthMin) / (max - min);
+    this.width = (this.value - min) * scale + this.widthMin;
+  }
+};
+
+/**
+ * Redraw a edge
+ * Draw this edge in the given canvas
+ * The 2d context of a HTML canvas can be retrieved by canvas.getContext("2d");
+ * @param {CanvasRenderingContext2D}   ctx
+ */
+Edge.prototype.draw = function(ctx) {
+  throw "Method draw not initialized in edge";
+};
+
+/**
+ * Check if this object is overlapping with the provided object
+ * @param {Object} obj   an object with parameters left, top
+ * @return {boolean}     True if location is located on the edge
+ */
+Edge.prototype.isOverlappingWith = function(obj) {
+  var distMax = 10;
+
+  var xFrom = this.from.x;
+  var yFrom = this.from.y;
+  var xTo = this.to.x;
+  var yTo = this.to.y;
+  var xObj = obj.left;
+  var yObj = obj.top;
+
+
+  var dist = Edge._dist(xFrom, yFrom, xTo, yTo, xObj, yObj);
+
+  return (dist < distMax);
+};
+
+
+/**
+ * Redraw a edge as a line
+ * Draw this edge in the given canvas
+ * The 2d context of a HTML canvas can be retrieved by canvas.getContext("2d");
+ * @param {CanvasRenderingContext2D}   ctx
+ * @private
+ */
+Edge.prototype._drawLine = function(ctx) {
+  // set style
+  ctx.strokeStyle = this.color;
+  ctx.lineWidth = this._getLineWidth();
+
+  var point;
+  if (this.from != this.to) {
+    // draw line
+    this._line(ctx);
+
+    // draw label
+    if (this.label) {
+      point = this._pointOnLine(0.5);
+      this._label(ctx, this.label, point.x, point.y);
+    }
+  }
+  else {
+    var x, y;
+    var radius = this.length / 4;
+    var node = this.from;
+    if (!node.width) {
+      node.resize(ctx);
+    }
+    if (node.width > node.height) {
+      x = node.x + node.width / 2;
+      y = node.y - radius;
+    }
+    else {
+      x = node.x + radius;
+      y = node.y - node.height / 2;
+    }
+    this._circle(ctx, x, y, radius);
+    point = this._pointOnCircle(x, y, radius, 0.5);
+    this._label(ctx, this.label, point.x, point.y);
+  }
+};
+
+/**
+ * Get the line width of the edge. Depends on width and whether one of the
+ * connected nodes is selected.
+ * @return {Number} width
+ * @private
+ */
+Edge.prototype._getLineWidth = function() {
+  if (this.from.selected || this.to.selected) {
+    return Math.min(this.width * 2, this.widthMax);
+  }
+  else {
+    return this.width;
+  }
+};
+
+/**
+ * Draw a line between two nodes
+ * @param {CanvasRenderingContext2D} ctx
+ * @private
+ */
+Edge.prototype._line = function (ctx) {
+  // draw a straight line
+  ctx.beginPath();
+  ctx.moveTo(this.from.x, this.from.y);
+  ctx.lineTo(this.to.x, this.to.y);
+  ctx.stroke();
+};
+
+/**
+ * Draw a line from a node to itself, a circle
+ * @param {CanvasRenderingContext2D} ctx
+ * @param {Number} x
+ * @param {Number} y
+ * @param {Number} radius
+ * @private
+ */
+Edge.prototype._circle = function (ctx, x, y, radius) {
+  // draw a circle
+  ctx.beginPath();
+  ctx.arc(x, y, radius, 0, 2 * Math.PI, false);
+  ctx.stroke();
+};
+
+/**
+ * Draw label with white background and with the middle at (x, y)
+ * @param {CanvasRenderingContext2D} ctx
+ * @param {String} text
+ * @param {Number} x
+ * @param {Number} y
+ * @private
+ */
+Edge.prototype._label = function (ctx, text, x, y) {
+  if (text) {
+    // TODO: cache the calculated size
+    ctx.font = ((this.from.selected || this.to.selected) ? "bold " : "") +
+        this.fontSize + "px " + this.fontFace;
+    ctx.fillStyle = 'white';
+    var width = ctx.measureText(text).width;
+    var height = this.fontSize;
+    var left = x - width / 2;
+    var top = y - height / 2;
+
+    ctx.fillRect(left, top, width, height);
+
+    // draw text
+    ctx.fillStyle = this.fontColor || "black";
+    ctx.textAlign = "left";
+    ctx.textBaseline = "top";
+    ctx.fillText(text, left, top);
+  }
+};
+
+/**
+ * Redraw a edge as a dashed line
+ * Draw this edge in the given canvas
+ * @author David Jordan
+ * @date 2012-08-08
+ * The 2d context of a HTML canvas can be retrieved by canvas.getContext("2d");
+ * @param {CanvasRenderingContext2D}   ctx
+ * @private
+ */
+Edge.prototype._drawDashLine = function(ctx) {
+  // set style
+  ctx.strokeStyle = this.color;
+  ctx.lineWidth = this._getLineWidth();
+
+  // draw dashed line
+  ctx.beginPath();
+  ctx.lineCap = 'round';
+  if (this.dash.altLength != undefined) //If an alt dash value has been set add to the array this value
+  {
+    ctx.dashedLine(this.from.x,this.from.y,this.to.x,this.to.y,
+        [this.dash.length,this.dash.gap,this.dash.altLength,this.dash.gap]);
+  }
+  else if (this.dash.length != undefined && this.dash.gap != undefined) //If a dash and gap value has been set add to the array this value
+  {
+    ctx.dashedLine(this.from.x,this.from.y,this.to.x,this.to.y,
+        [this.dash.length,this.dash.gap]);
+  }
+  else //If all else fails draw a line
+  {
+    ctx.moveTo(this.from.x, this.from.y);
+    ctx.lineTo(this.to.x, this.to.y);
+  }
+  ctx.stroke();
+
+  // draw label
+  if (this.label) {
+    var point = this._pointOnLine(0.5);
+    this._label(ctx, this.label, point.x, point.y);
+  }
+};
+
+/**
+ * Get a point on a line
+ * @param {Number} percentage. Value between 0 (line start) and 1 (line end)
+ * @return {Object} point
+ * @private
+ */
+Edge.prototype._pointOnLine = function (percentage) {
+  return {
+    x: (1 - percentage) * this.from.x + percentage * this.to.x,
+    y: (1 - percentage) * this.from.y + percentage * this.to.y
+  }
+};
+
+/**
+ * Get a point on a circle
+ * @param {Number} x
+ * @param {Number} y
+ * @param {Number} radius
+ * @param {Number} percentage. Value between 0 (line start) and 1 (line end)
+ * @return {Object} point
+ * @private
+ */
+Edge.prototype._pointOnCircle = function (x, y, radius, percentage) {
+  var angle = (percentage - 3/8) * 2 * Math.PI;
+  return {
+    x: x + radius * Math.cos(angle),
+    y: y - radius * Math.sin(angle)
+  }
+};
+
+/**
+ * Redraw a edge as a line with an arrow halfway the line
+ * Draw this edge in the given canvas
+ * The 2d context of a HTML canvas can be retrieved by canvas.getContext("2d");
+ * @param {CanvasRenderingContext2D}   ctx
+ * @private
+ */
+Edge.prototype._drawArrowCenter = function(ctx) {
+  var point;
+  // set style
+  ctx.strokeStyle = this.color;
+  ctx.fillStyle = this.color;
+  ctx.lineWidth = this._getLineWidth();
+
+  if (this.from != this.to) {
+    // draw line
+    this._line(ctx);
+
+    // draw an arrow halfway the line
+    var angle = Math.atan2((this.to.y - this.from.y), (this.to.x - this.from.x));
+    var length = 10 + 5 * this.width; // TODO: make customizable?
+    point = this._pointOnLine(0.5);
+    ctx.arrow(point.x, point.y, angle, length);
+    ctx.fill();
+    ctx.stroke();
+
+    // draw label
+    if (this.label) {
+      point = this._pointOnLine(0.5);
+      this._label(ctx, this.label, point.x, point.y);
+    }
+  }
+  else {
+    // draw circle
+    var x, y;
+    var radius = this.length / 4;
+    var node = this.from;
+    if (!node.width) {
+      node.resize(ctx);
+    }
+    if (node.width > node.height) {
+      x = node.x + node.width / 2;
+      y = node.y - radius;
+    }
+    else {
+      x = node.x + radius;
+      y = node.y - node.height / 2;
+    }
+    this._circle(ctx, x, y, radius);
+
+    // draw all arrows
+    var angle = 0.2 * Math.PI;
+    var length = 10 + 5 * this.width; // TODO: make customizable?
+    point = this._pointOnCircle(x, y, radius, 0.5);
+    ctx.arrow(point.x, point.y, angle, length);
+    ctx.fill();
+    ctx.stroke();
+
+    // draw label
+    if (this.label) {
+      point = this._pointOnCircle(x, y, radius, 0.5);
+      this._label(ctx, this.label, point.x, point.y);
+    }
+  }
+};
+
+
+
+/**
+ * Redraw a edge as a line with an arrow
+ * Draw this edge in the given canvas
+ * The 2d context of a HTML canvas can be retrieved by canvas.getContext("2d");
+ * @param {CanvasRenderingContext2D}   ctx
+ * @private
+ */
+Edge.prototype._drawArrow = function(ctx) {
+  // set style
+  ctx.strokeStyle = this.color;
+  ctx.fillStyle = this.color;
+  ctx.lineWidth = this._getLineWidth();
+
+  // draw line
+  var angle, length;
+  if (this.from != this.to) {
+    // calculate length and angle of the line
+    angle = Math.atan2((this.to.y - this.from.y), (this.to.x - this.from.x));
+    var dx = (this.to.x - this.from.x);
+    var dy = (this.to.y - this.from.y);
+    var lEdge = Math.sqrt(dx * dx + dy * dy);
+
+    var lFrom = this.from.distanceToBorder(ctx, angle + Math.PI);
+    var pFrom = (lEdge - lFrom) / lEdge;
+    var xFrom = (pFrom) * this.from.x + (1 - pFrom) * this.to.x;
+    var yFrom = (pFrom) * this.from.y + (1 - pFrom) * this.to.y;
+
+    var lTo = this.to.distanceToBorder(ctx, angle);
+    var pTo = (lEdge - lTo) / lEdge;
+    var xTo = (1 - pTo) * this.from.x + pTo * this.to.x;
+    var yTo = (1 - pTo) * this.from.y + pTo * this.to.y;
+
+    ctx.beginPath();
+    ctx.moveTo(xFrom, yFrom);
+    ctx.lineTo(xTo, yTo);
+    ctx.stroke();
+
+    // draw arrow at the end of the line
+    length = 10 + 5 * this.width; // TODO: make customizable?
+    ctx.arrow(xTo, yTo, angle, length);
+    ctx.fill();
+    ctx.stroke();
+
+    // draw label
+    if (this.label) {
+      var point = this._pointOnLine(0.5);
+      this._label(ctx, this.label, point.x, point.y);
+    }
+  }
+  else {
+    // draw circle
+    var node = this.from;
+    var x, y, arrow;
+    var radius = this.length / 4;
+    if (!node.width) {
+      node.resize(ctx);
+    }
+    if (node.width > node.height) {
+      x = node.x + node.width / 2;
+      y = node.y - radius;
+      arrow = {
+        x: x,
+        y: node.y,
+        angle: 0.9 * Math.PI
+      };
+    }
+    else {
+      x = node.x + radius;
+      y = node.y - node.height / 2;
+      arrow = {
+        x: node.x,
+        y: y,
+        angle: 0.6 * Math.PI
+      };
+    }
+    ctx.beginPath();
+    // TODO: do not draw a circle, but an arc
+    // TODO: similarly, for a line without arrows, draw to the border of the nodes instead of the center
+    ctx.arc(x, y, radius, 0, 2 * Math.PI, false);
+    ctx.stroke();
+
+    // draw all arrows
+    length = 10 + 5 * this.width; // TODO: make customizable?
+    ctx.arrow(arrow.x, arrow.y, arrow.angle, length);
+    ctx.fill();
+    ctx.stroke();
+
+    // draw label
+    if (this.label) {
+      point = this._pointOnCircle(x, y, radius, 0.5);
+      this._label(ctx, this.label, point.x, point.y);
+    }
+  }
+};
+
+
+
+/**
+ * Calculate the distance between a point (x3,y3) and a line segment from
+ * (x1,y1) to (x2,y2).
+ * http://stackoverflow.com/questions/849211/shortest-distancae-between-a-point-and-a-line-segment
+ * @param {number} x1
+ * @param {number} y1
+ * @param {number} x2
+ * @param {number} y2
+ * @param {number} x3
+ * @param {number} y3
+ * @private
+ */
+Edge._dist = function (x1,y1, x2,y2, x3,y3) { // x3,y3 is the point
+  var px = x2-x1,
+      py = y2-y1,
+      something = px*px + py*py,
+      u =  ((x3 - x1) * px + (y3 - y1) * py) / something;
+
+  if (u > 1) {
+    u = 1;
+  }
+  else if (u < 0) {
+    u = 0;
+  }
+
+  var x = x1 + u * px,
+      y = y1 + u * py,
+      dx = x - x3,
+      dy = y - y3;
+
+  //# Note: If the actual distance does not matter,
+  //# if you only want to compare what this function
+  //# returns to other results of this function, you
+  //# can just return the squared distance instead
+  //# (i.e. remove the sqrt) to gain a little performance
+
+  return Math.sqrt(dx*dx + dy*dy);
+};
+
+/**
+ * Popup is a class to create a popup window with some text
+ * @param {Element}  container     The container object.
+ * @param {Number} [x]
+ * @param {Number} [y]
+ * @param {String} [text]
+ */
+function Popup(container, x, y, text) {
+  if (container) {
+    this.container = container;
+  }
+  else {
+    this.container = document.body;
+  }
+  this.x = 0;
+  this.y = 0;
+  this.padding = 5;
+
+  if (x !== undefined && y !== undefined ) {
+    this.setPosition(x, y);
+  }
+  if (text !== undefined) {
+    this.setText(text);
+  }
+
+  // create the frame
+  this.frame = document.createElement("div");
+  var style = this.frame.style;
+  style.position = "absolute";
+  style.visibility = "hidden";
+  style.border = "1px solid #666";
+  style.color = "black";
+  style.padding = this.padding + "px";
+  style.backgroundColor = "#FFFFC6";
+  style.borderRadius = "3px";
+  style.MozBorderRadius = "3px";
+  style.WebkitBorderRadius = "3px";
+  style.boxShadow = "3px 3px 10px rgba(128, 128, 128, 0.5)";
+  style.whiteSpace = "nowrap";
+  this.container.appendChild(this.frame);
+};
+
+/**
+ * @param {number} x   Horizontal position of the popup window
+ * @param {number} y   Vertical position of the popup window
+ */
+Popup.prototype.setPosition = function(x, y) {
+  this.x = parseInt(x);
+  this.y = parseInt(y);
+};
+
+/**
+ * Set the text for the popup window. This can be HTML code
+ * @param {string} text
+ */
+Popup.prototype.setText = function(text) {
+  this.frame.innerHTML = text;
+};
+
+/**
+ * Show the popup window
+ * @param {boolean} show    Optional. Show or hide the window
+ */
+Popup.prototype.show = function (show) {
+  if (show === undefined) {
+    show = true;
+  }
+
+  if (show) {
+    var height = this.frame.clientHeight;
+    var width =  this.frame.clientWidth;
+    var maxHeight = this.frame.parentNode.clientHeight;
+    var maxWidth = this.frame.parentNode.clientWidth;
+
+    var top = (this.y - height);
+    if (top + height + this.padding > maxHeight) {
+      top = maxHeight - height - this.padding;
+    }
+    if (top < this.padding) {
+      top = this.padding;
+    }
+
+    var left = this.x;
+    if (left + width + this.padding > maxWidth) {
+      left = maxWidth - width - this.padding;
+    }
+    if (left < this.padding) {
+      left = this.padding;
+    }
+
+    this.frame.style.left = left + "px";
+    this.frame.style.top = top + "px";
+    this.frame.style.visibility = "visible";
+  }
+  else {
+    this.hide();
+  }
+};
+
+/**
+ * Hide the popup window
+ */
+Popup.prototype.hide = function () {
+  this.frame.style.visibility = "hidden";
+};
+
+/**
+ * @class Groups
+ * This class can store groups and properties specific for groups.
+ */
+Groups = function () {
+  this.clear();
+  this.defaultIndex = 0;
+};
+
+
+/**
+ * default constants for group colors
+ */
+Groups.DEFAULT = [
+  {border: "#2B7CE9", background: "#97C2FC", highlight: {border: "#2B7CE9", background: "#D2E5FF"}}, // blue
+  {border: "#FFA500", background: "#FFFF00", highlight: {border: "#FFA500", background: "#FFFFA3"}}, // yellow
+  {border: "#FA0A10", background: "#FB7E81", highlight: {border: "#FA0A10", background: "#FFAFB1"}}, // red
+  {border: "#41A906", background: "#7BE141", highlight: {border: "#41A906", background: "#A1EC76"}}, // green
+  {border: "#E129F0", background: "#EB7DF4", highlight: {border: "#E129F0", background: "#F0B3F5"}}, // magenta
+  {border: "#7C29F0", background: "#AD85E4", highlight: {border: "#7C29F0", background: "#D3BDF0"}}, // purple
+  {border: "#C37F00", background: "#FFA807", highlight: {border: "#C37F00", background: "#FFCA66"}}, // orange
+  {border: "#4220FB", background: "#6E6EFD", highlight: {border: "#4220FB", background: "#9B9BFD"}}, // darkblue
+  {border: "#FD5A77", background: "#FFC0CB", highlight: {border: "#FD5A77", background: "#FFD1D9"}}, // pink
+  {border: "#4AD63A", background: "#C2FABC", highlight: {border: "#4AD63A", background: "#E6FFE3"}}  // mint
+];
+
+
+/**
+ * Clear all groups
+ */
+Groups.prototype.clear = function () {
+  this.groups = {};
+  this.groups.length = function()
+  {
+    var i = 0;
+    for ( var p in this ) {
+      if (this.hasOwnProperty(p)) {
+        i++;
+      }
+    }
+    return i;
+  }
+};
+
+
+/**
+ * get group properties of a groupname. If groupname is not found, a new group
+ * is added.
+ * @param {*} groupname        Can be a number, string, Date, etc.
+ * @return {Object} group      The created group, containing all group properties
+ */
+Groups.prototype.get = function (groupname) {
+  var group = this.groups[groupname];
+
+  if (group == undefined) {
+    // create new group
+    var index = this.defaultIndex % Groups.DEFAULT.length;
+    this.defaultIndex++;
+    group = {};
+    group.color = Groups.DEFAULT[index];
+    this.groups[groupname] = group;
+  }
+
+  return group;
+};
+
+/**
+ * Add a custom group style
+ * @param {String} groupname
+ * @param {Object} style       An object containing borderColor,
+ *                             backgroundColor, etc.
+ * @return {Object} group      The created group object
+ */
+Groups.prototype.add = function (groupname, style) {
+  this.groups[groupname] = style;
+  if (style.color) {
+    style.color = Node.parseColor(style.color);
+  }
+  return style;
+};
+
+/**
+ * @class Images
+ * This class loads images and keeps them stored.
+ */
+Images = function () {
+  this.images = {};
+
+  this.callback = undefined;
+};
+
+/**
+ * Set an onload callback function. This will be called each time an image
+ * is loaded
+ * @param {function} callback
+ */
+Images.prototype.setOnloadCallback = function(callback) {
+  this.callback = callback;
+};
+
+/**
+ *
+ * @param {string} url          Url of the image
+ * @return {Image} img          The image object
+ */
+Images.prototype.load = function(url) {
+  var img = this.images[url];
+  if (img == undefined) {
+    // create the image
+    var images = this;
+    img = new Image();
+    this.images[url] = img;
+    img.onload = function() {
+      if (images.callback) {
+        images.callback(this);
+      }
+    };
+    img.src = url;
+  }
+
+  return img;
+};
+
+/**
+ * @constructor Graph
+ * Create a graph visualization, displaying nodes and edges.
+ *
+ * @param {Element} container   The DOM element in which the Graph will
+ *                                  be created. Normally a div element.
+ * @param {Object} data         An object containing parameters
+ *                              {Array} nodes
+ *                              {Array} edges
+ * @param {Object} options      Options
+ */
+function Graph (container, data, options) {
+  // create variables and set default values
+  this.containerElement = container;
+  this.width = '100%';
+  this.height = '100%';
+  this.refreshRate = 50; // milliseconds
+  this.stabilize = true; // stabilize before displaying the graph
+  this.selectable = true;
+
+  // set constant values
+  this.constants = {
+    nodes: {
+      radiusMin: 5,
+      radiusMax: 20,
+      radius: 5,
+      distance: 100, // px
+      shape: 'ellipse',
+      image: undefined,
+      widthMin: 16, // px
+      widthMax: 64, // px
+      fontColor: 'black',
+      fontSize: 14, // px
+      //fontFace: verdana,
+      fontFace: 'arial',
+      color: {
+        border: '#2B7CE9',
+        background: '#97C2FC',
+        highlight: {
+          border: '#2B7CE9',
+          background: '#D2E5FF'
+        }
+      },
+      borderColor: '#2B7CE9',
+      backgroundColor: '#97C2FC',
+      highlightColor: '#D2E5FF',
+      group: undefined
+    },
+    edges: {
+      widthMin: 1,
+      widthMax: 15,
+      width: 1,
+      style: 'line',
+      color: '#343434',
+      fontColor: '#343434',
+      fontSize: 14, // px
+      fontFace: 'arial',
+      //distance: 100, //px
+      length: 100,   // px
+      dash: {
+        length: 10,
+        gap: 5,
+        altLength: undefined
+      }
+    },
+    minForce: 0.05,
+    minVelocity: 0.02,   // px/s
+    maxIterations: 1000  // maximum number of iteration to stabilize
+  };
+
+  var graph = this;
+  this.nodes = {};            // object with Node objects
+  this.edges = {};            // object with Edge objects
+  // TODO: create a counter to keep track on the number of nodes having values
+  // TODO: create a counter to keep track on the number of nodes currently moving
+  // TODO: create a counter to keep track on the number of edges having values
+
+  this.nodesData = null;      // A DataSet or DataView
+  this.edgesData = null;      // A DataSet or DataView
+
+  // create event listeners used to subscribe on the DataSets of the nodes and edges
+  var me = this;
+  this.nodesListeners = {
+    'add': function (event, params) {
+      me._addNodes(params.items);
+      me.start();
+    },
+    'update': function (event, params) {
+      me._updateNodes(params.items);
+      me.start();
+    },
+    'remove': function (event, params) {
+      me._removeNodes(params.items);
+      me.start();
+    }
+  };
+  this.edgesListeners = {
+    'add': function (event, params) {
+      me._addEdges(params.items);
+      me.start();
+    },
+    'update': function (event, params) {
+      me._updateEdges(params.items);
+      me.start();
+    },
+    'remove': function (event, params) {
+      me._removeEdges(params.items);
+      me.start();
+    }
+  };
+
+  this.groups = new Groups(); // object with groups
+  this.images = new Images(); // object with images
+  this.images.setOnloadCallback(function () {
+    graph._redraw();
+  });
+
+  // properties of the data
+  this.moving = false;    // True if any of the nodes have an undefined position
+
+  this.selection = [];
+  this.timer = undefined;
+
+  // create a frame and canvas
+  this._create();
+
+  // apply options
+  this.setOptions(options);
+
+  // draw data
+  this.setData(data);
+}
+
+/**
+ * Set nodes and edges, and optionally options as well.
+ *
+ * @param {Object} data    Object containing parameters:
+ *                         {Array | DataSet | DataView} [nodes] Array with nodes
+ *                         {Array | DataSet | DataView} [edges] Array with edges
+ *                         {String} [dot] String containing data in DOT format
+ *                         {Options} [options] Object with options
+ */
+Graph.prototype.setData = function(data) {
+  if (data && data.dot && (data.nodes || data.edges)) {
+    throw new SyntaxError('Data must contain either parameter "dot" or ' +
+        ' parameter pair "nodes" and "edges", but not both.');
+  }
+
+  // set options
+  this.setOptions(data && data.options);
+
+  // set all data
+  if (data && data.dot) {
+    // parse DOT file
+    if(data && data.dot) {
+      var dotData = vis.util.DOTToGraph(data.dot);
+      this.setData(dotData);
+      return;
+    }
+  }
+  else {
+    this._setNodes(data && data.nodes);
+    this._setEdges(data && data.edges);
+  }
+
+  // find a stable position or start animating to a stable position
+  if (this.stabilize) {
+    this._doStabilize();
+  }
+  this.start();
+};
+
+/**
+ * Set options
+ * @param {Object} options
+ */
+Graph.prototype.setOptions = function (options) {
+  if (options) {
+    // retrieve parameter values
+    if (options.width != undefined)           {this.width = options.width;}
+    if (options.height != undefined)          {this.height = options.height;}
+    if (options.stabilize != undefined)       {this.stabilize = options.stabilize;}
+    if (options.selectable != undefined)      {this.selectable = options.selectable;}
+
+    // TODO: work out these options and document them
+    if (options.edges) {
+      for (var prop in options.edges) {
+        if (options.edges.hasOwnProperty(prop)) {
+          this.constants.edges[prop] = options.edges[prop];
+        }
+      }
+
+      if (options.edges.length != undefined &&
+          options.nodes && options.nodes.distance == undefined) {
+        this.constants.edges.length   = options.edges.length;
+        this.constants.nodes.distance = options.edges.length * 1.25;
+      }
+
+      if (!options.edges.fontColor) {
+        this.constants.edges.fontColor = options.edges.color;
+      }
+
+      // Added to support dashed lines
+      // David Jordan
+      // 2012-08-08
+      if (options.edges.dash) {
+        if (options.edges.dash.length != undefined) {
+          this.constants.edges.dash.length = options.edges.dash.length;
+        }
+        if (options.edges.dash.gap != undefined) {
+          this.constants.edges.dash.gap = options.edges.dash.gap;
+        }
+        if (options.edges.dash.altLength != undefined) {
+          this.constants.edges.dash.altLength = options.edges.dash.altLength;
+        }
+      }
+    }
+
+    if (options.nodes) {
+      for (prop in options.nodes) {
+        if (options.nodes.hasOwnProperty(prop)) {
+          this.constants.nodes[prop] = options.nodes[prop];
+        }
+      }
+
+      if (options.nodes.color) {
+        this.constants.nodes.color = Node.parseColor(options.nodes.color);
+      }
+
+      /*
+       if (options.nodes.widthMin) this.constants.nodes.radiusMin = options.nodes.widthMin;
+       if (options.nodes.widthMax) this.constants.nodes.radiusMax = options.nodes.widthMax;
+       */
+    }
+
+    if (options.groups) {
+      for (var groupname in options.groups) {
+        if (options.groups.hasOwnProperty(groupname)) {
+          var group = options.groups[groupname];
+          this.groups.add(groupname, group);
+        }
+      }
+    }
+  }
+
+  this.setSize(this.width, this.height);
+  this._setTranslation(this.frame.clientWidth / 2, this.frame.clientHeight / 2);
+  this._setScale(1);
+};
+
+/**
+ * fire an event
+ * @param {String} event   The name of an event, for example 'select'
+ * @param {Object} params  Optional object with event parameters
+ * @private
+ */
+Graph.prototype._trigger = function (event, params) {
+  events.trigger(this, event, params);
+};
+
+
+/**
+ * Create the main frame for the Graph.
+ * This function is executed once when a Graph object is created. The frame
+ * contains a canvas, and this canvas contains all objects like the axis and
+ * nodes.
+ * @private
+ */
+Graph.prototype._create = function () {
+  // remove all elements from the container element.
+  while (this.containerElement.hasChildNodes()) {
+    this.containerElement.removeChild(this.containerElement.firstChild);
+  }
+
+  this.frame = document.createElement('div');
+  this.frame.className = 'graph-frame';
+  this.frame.style.position = 'relative';
+  this.frame.style.overflow = 'hidden';
+
+  // create the graph canvas (HTML canvas element)
+  this.frame.canvas = document.createElement( 'canvas' );
+  this.frame.canvas.style.position = 'relative';
+  this.frame.appendChild(this.frame.canvas);
+  if (!this.frame.canvas.getContext) {
+    var noCanvas = document.createElement( 'DIV' );
+    noCanvas.style.color = 'red';
+    noCanvas.style.fontWeight =  'bold' ;
+    noCanvas.style.padding =  '10px';
+    noCanvas.innerHTML =  'Error: your browser does not support HTML canvas';
+    this.frame.canvas.appendChild(noCanvas);
+  }
+
+  var me = this;
+  this.drag = {};
+  this.pinch = {};
+  this.hammer = Hammer(this.frame.canvas, {
+    prevent_default: true
+  });
+  this.hammer.on('tap',       me._onTap.bind(me) );
+  this.hammer.on('hold',      me._onHold.bind(me) );
+  this.hammer.on('pinch',     me._onPinch.bind(me) );
+  this.hammer.on('touch',     me._onTouch.bind(me) );
+  this.hammer.on('dragstart', me._onDragStart.bind(me) );
+  this.hammer.on('drag',      me._onDrag.bind(me) );
+  this.hammer.on('dragend',   me._onDragEnd.bind(me) );
+  this.hammer.on('mousewheel',me._onMouseWheel.bind(me) );
+  this.hammer.on('DOMMouseScroll',me._onMouseWheel.bind(me) ); // for FF
+  this.hammer.on('mousemove', me._onMouseMoveTitle.bind(me) );
+
+  // add the frame to the container element
+  this.containerElement.appendChild(this.frame);
+};
+
+/**
+ *
+ * @param {{x: Number, y: Number}} pointer
+ * @return {Number | null} node
+ * @private
+ */
+Graph.prototype._getNodeAt = function (pointer) {
+  var x = this._canvasToX(pointer.x);
+  var y = this._canvasToY(pointer.y);
+
+  var obj = {
+    left:   x,
+    top:    y,
+    right:  x,
+    bottom: y
+  };
+
+  // if there are overlapping nodes, select the last one, this is the
+  // one which is drawn on top of the others
+  var overlappingNodes = this._getNodesOverlappingWith(obj);
+  return (overlappingNodes.length > 0) ?
+      overlappingNodes[overlappingNodes.length - 1] : null;
+};
+
+/**
+ * Get the pointer location from a touch location
+ * @param {{pageX: Number, pageY: Number}} touch
+ * @return {{x: Number, y: Number}} pointer
+ * @private
+ */
+Graph.prototype._getPointer = function (touch) {
+  return {
+    x: touch.pageX - vis.util.getAbsoluteLeft(this.frame.canvas),
+    y: touch.pageY - vis.util.getAbsoluteTop(this.frame.canvas)
+  };
+};
+
+/**
+ * On start of a touch gesture, store the pointer
+ * @param event
+ * @private
+ */
+Graph.prototype._onTouch = function (event) {
+  this.drag.pointer = this._getPointer(event.gesture.touches[0]);
+  this.drag.pinched = false;
+  this.pinch.scale = this._getScale();
+};
+
+/**
+ * handle drag start event
+ * @private
+ */
+Graph.prototype._onDragStart = function () {
+  var drag = this.drag;
+
+  drag.selection = [];
+  drag.translation = this._getTranslation();
+  drag.nodeId = this._getNodeAt(drag.pointer);
+  // note: drag.pointer is set in _onTouch to get the initial touch location
+
+  var node = this.nodes[drag.nodeId];
+  if (node) {
+    // select the clicked node if not yet selected
+    if (!node.isSelected()) {
+      this._selectNodes([drag.nodeId]);
+    }
+
+    // create an array with the selected nodes and their original location and status
+    var me = this;
+    this.selection.forEach(function (id) {
+      var node = me.nodes[id];
+      if (node) {
+        var s = {
+          id: id,
+          node: node,
+
+          // store original x, y, xFixed and yFixed, make the node temporarily Fixed
+          x: node.x,
+          y: node.y,
+          xFixed: node.xFixed,
+          yFixed: node.yFixed
+        };
+
+        node.xFixed = true;
+        node.yFixed = true;
+
+        drag.selection.push(s);
+      }
+    });
+
+  }
+};
+
+/**
+ * handle drag event
+ * @private
+ */
+Graph.prototype._onDrag = function (event) {
+  if (this.drag.pinched) {
+    return;
+  }
+
+  var pointer = this._getPointer(event.gesture.touches[0]);
+
+  var me = this,
+      drag = this.drag,
+      selection = drag.selection;
+  if (selection && selection.length) {
+    // calculate delta's and new location
+    var deltaX = pointer.x - drag.pointer.x,
+        deltaY = pointer.y - drag.pointer.y;
+
+    // update position of all selected nodes
+    selection.forEach(function (s) {
+      var node = s.node;
+
+      if (!s.xFixed) {
+        node.x = me._canvasToX(me._xToCanvas(s.x) + deltaX);
+      }
+
+      if (!s.yFixed) {
+        node.y = me._canvasToY(me._yToCanvas(s.y) + deltaY);
+      }
+    });
+
+    // start animation if not yet running
+    if (!this.moving) {
+      this.moving = true;
+      this.start();
+    }
+  }
+  else {
+    // move the graph
+    var diffX = pointer.x - this.drag.pointer.x;
+    var diffY = pointer.y - this.drag.pointer.y;
+
+    this._setTranslation(
+        this.drag.translation.x + diffX,
+        this.drag.translation.y + diffY);
+    this._redraw();
+
+    this.moved = true;
+  }
+};
+
+/**
+ * handle drag start event
+ * @private
+ */
+Graph.prototype._onDragEnd = function () {
+  var selection = this.drag.selection;
+  if (selection) {
+    selection.forEach(function (s) {
+      // restore original xFixed and yFixed
+      s.node.xFixed = s.xFixed;
+      s.node.yFixed = s.yFixed;
+    });
+  }
+};
+
+/**
+ * handle tap/click event: select/unselect a node
+ * @private
+ */
+Graph.prototype._onTap = function (event) {
+  var pointer = this._getPointer(event.gesture.touches[0]);
+
+  var nodeId = this._getNodeAt(pointer);
+  var node = this.nodes[nodeId];
+  if (node) {
+    // select this node
+    this._selectNodes([nodeId]);
+
+    if (!this.moving) {
+      this._redraw();
+    }
+  }
+  else {
+    // remove selection
+    this._unselectNodes();
+    this._redraw();
+  }
+};
+
+/**
+ * handle long tap event: multi select nodes
+ * @private
+ */
+Graph.prototype._onHold = function (event) {
+  var pointer = this._getPointer(event.gesture.touches[0]);
+  var nodeId = this._getNodeAt(pointer);
+  var node = this.nodes[nodeId];
+  if (node) {
+    if (!node.isSelected()) {
+      // select this node, keep previous selection
+      var append = true;
+      this._selectNodes([nodeId], append);
+    }
+    else {
+      this._unselectNodes([nodeId]);
+    }
+
+    if (!this.moving) {
+      this._redraw();
+    }
+  }
+  else {
+    // Do nothing
+  }
+};
+
+/**
+ * Handle pinch event
+ * @param event
+ * @private
+ */
+Graph.prototype._onPinch = function (event) {
+  var pointer = this._getPointer(event.gesture.center);
+
+  this.drag.pinched = true;
+  if (!('scale' in this.pinch)) {
+    this.pinch.scale = 1;
+  }
+
+  // TODO: enable moving while pinching?
+  var scale = this.pinch.scale * event.gesture.scale;
+  this._zoom(scale, pointer)
+};
+
+/**
+ * Zoom the graph in or out
+ * @param {Number} scale a number around 1, and between 0.01 and 10
+ * @param {{x: Number, y: Number}} pointer
+ * @return {Number} appliedScale    scale is limited within the boundaries
+ * @private
+ */
+Graph.prototype._zoom = function(scale, pointer) {
+  var scaleOld = this._getScale();
+  if (scale < 0.01) {
+    scale = 0.01;
+  }
+  if (scale > 10) {
+    scale = 10;
+  }
+
+  var translation = this._getTranslation();
+  var scaleFrac = scale / scaleOld;
+  var tx = (1 - scaleFrac) * pointer.x + translation.x * scaleFrac;
+  var ty = (1 - scaleFrac) * pointer.y + translation.y * scaleFrac;
+
+  this._setScale(scale);
+  this._setTranslation(tx, ty);
+  this._redraw();
+
+  return scale;
+};
+
+/**
+ * Event handler for mouse wheel event, used to zoom the timeline
+ * See http://adomas.org/javascript-mouse-wheel/
+ *     https://github.com/EightMedia/hammer.js/issues/256
+ * @param {MouseEvent}  event
+ * @private
+ */
+Graph.prototype._onMouseWheel = function(event) {
+  // retrieve delta
+  var delta = 0;
+  if (event.wheelDelta) { /* IE/Opera. */
+    delta = event.wheelDelta/120;
+  } else if (event.detail) { /* Mozilla case. */
+    // In Mozilla, sign of delta is different than in IE.
+    // Also, delta is multiple of 3.
+    delta = -event.detail/3;
+  }
+
+  // If delta is nonzero, handle it.
+  // Basically, delta is now positive if wheel was scrolled up,
+  // and negative, if wheel was scrolled down.
+  if (delta) {
+    if (!('mouswheelScale' in this.pinch)) {
+      this.pinch.mouswheelScale = 1;
+    }
+
+    // calculate the new scale
+    var scale = this.pinch.mouswheelScale;
+    var zoom = delta / 10;
+    if (delta < 0) {
+      zoom = zoom / (1 - zoom);
+    }
+    scale *= (1 + zoom);
+
+    // calculate the pointer location
+    var gesture = util.fakeGesture(this, event);
+    var pointer = this._getPointer(gesture.center);
+
+    // apply the new scale
+    scale = this._zoom(scale, pointer);
+
+    // store the new, applied scale
+    this.pinch.mouswheelScale = scale;
+  }
+
+  // Prevent default actions caused by mouse wheel.
+  event.preventDefault();
+};
+
+
+/**
+ * Mouse move handler for checking whether the title moves over a node with a title.
+ * @param  {Event} event
+ * @private
+ */
+Graph.prototype._onMouseMoveTitle = function (event) {
+  var gesture = util.fakeGesture(this, event);
+  var pointer = this._getPointer(gesture.center);
+
+  // check if the previously selected node is still selected
+  if (this.popupNode) {
+    this._checkHidePopup(pointer);
+  }
+
+  // start a timeout that will check if the mouse is positioned above
+  // an element
+  var me = this;
+  var checkShow = function() {
+    me._checkShowPopup(pointer);
+  };
+  if (this.popupTimer) {
+    clearInterval(this.popupTimer); // stop any running timer
+  }
+  if (!this.leftButtonDown) {
+    this.popupTimer = setTimeout(checkShow, 300);
+  }
+};
+
+/**
+ * Check if there is an element on the given position in the graph
+ * (a node or edge). If so, and if this element has a title,
+ * show a popup window with its title.
+ *
+ * @param {{x:Number, y:Number}} pointer
+ * @private
+ */
+Graph.prototype._checkShowPopup = function (pointer) {
+  var obj = {
+    left:   this._canvasToX(pointer.x),
+    top:    this._canvasToY(pointer.y),
+    right:  this._canvasToX(pointer.x),
+    bottom: this._canvasToY(pointer.y)
+  };
+
+  var id;
+  var lastPopupNode = this.popupNode;
+
+  if (this.popupNode == undefined) {
+    // search the nodes for overlap, select the top one in case of multiple nodes
+    var nodes = this.nodes;
+    for (id in nodes) {
+      if (nodes.hasOwnProperty(id)) {
+        var node = nodes[id];
+        if (node.getTitle() != undefined && node.isOverlappingWith(obj)) {
+          this.popupNode = node;
+          break;
+        }
+      }
+    }
+  }
+
+  if (this.popupNode == undefined) {
+    // search the edges for overlap
+    var edges = this.edges;
+    for (id in edges) {
+      if (edges.hasOwnProperty(id)) {
+        var edge = edges[id];
+        if (edge.connected && (edge.getTitle() != undefined) &&
+            edge.isOverlappingWith(obj)) {
+          this.popupNode = edge;
+          break;
+        }
+      }
+    }
+  }
+
+  if (this.popupNode) {
+    // show popup message window
+    if (this.popupNode != lastPopupNode) {
+      var me = this;
+      if (!me.popup) {
+        me.popup = new Popup(me.frame);
+      }
+
+      // adjust a small offset such that the mouse cursor is located in the
+      // bottom left location of the popup, and you can easily move over the
+      // popup area
+      me.popup.setPosition(pointer.x - 3, pointer.y - 3);
+      me.popup.setText(me.popupNode.getTitle());
+      me.popup.show();
+    }
+  }
+  else {
+    if (this.popup) {
+      this.popup.hide();
+    }
+  }
+};
+
+/**
+ * Check if the popup must be hided, which is the case when the mouse is no
+ * longer hovering on the object
+ * @param {{x:Number, y:Number}} pointer
+ * @private
+ */
+Graph.prototype._checkHidePopup = function (pointer) {
+  if (!this.popupNode || !this._getNodeAt(pointer) ) {
+    this.popupNode = undefined;
+    if (this.popup) {
+      this.popup.hide();
+    }
+  }
+};
+
+/**
+ * Unselect selected nodes. If no selection array is provided, all nodes
+ * are unselected
+ * @param {Object[]} selection     Array with selection objects, each selection
+ *                                 object has a parameter row. Optional
+ * @param {Boolean} triggerSelect  If true (default), the select event
+ *                                 is triggered when nodes are unselected
+ * @return {Boolean} changed       True if the selection is changed
+ * @private
+ */
+Graph.prototype._unselectNodes = function(selection, triggerSelect) {
+  var changed = false;
+  var i, iMax, id;
+
+  if (selection) {
+    // remove provided selections
+    for (i = 0, iMax = selection.length; i < iMax; i++) {
+      id = selection[i];
+      this.nodes[id].unselect();
+
+      var j = 0;
+      while (j < this.selection.length) {
+        if (this.selection[j] == id) {
+          this.selection.splice(j, 1);
+          changed = true;
+        }
+        else {
+          j++;
+        }
+      }
+    }
+  }
+  else if (this.selection && this.selection.length) {
+    // remove all selections
+    for (i = 0, iMax = this.selection.length; i < iMax; i++) {
+      id = this.selection[i];
+      this.nodes[id].unselect();
+      changed = true;
+    }
+    this.selection = [];
+  }
+
+  if (changed && (triggerSelect == true || triggerSelect == undefined)) {
+    // fire the select event
+    this._trigger('select');
+  }
+
+  return changed;
+};
+
+/**
+ * select all nodes on given location x, y
+ * @param {Array} selection   an array with node ids
+ * @param {boolean} append    If true, the new selection will be appended to the
+ *                            current selection (except for duplicate entries)
+ * @return {Boolean} changed  True if the selection is changed
+ * @private
+ */
+Graph.prototype._selectNodes = function(selection, append) {
+  var changed = false;
+  var i, iMax;
+
+  // TODO: the selectNodes method is a little messy, rework this
+
+  // check if the current selection equals the desired selection
+  var selectionAlreadyThere = true;
+  if (selection.length != this.selection.length) {
+    selectionAlreadyThere = false;
+  }
+  else {
+    for (i = 0, iMax = Math.min(selection.length, this.selection.length); i < iMax; i++) {
+      if (selection[i] != this.selection[i]) {
+        selectionAlreadyThere = false;
+        break;
+      }
+    }
+  }
+  if (selectionAlreadyThere) {
+    return changed;
+  }
+
+  if (append == undefined || append == false) {
+    // first deselect any selected node
+    var triggerSelect = false;
+    changed = this._unselectNodes(undefined, triggerSelect);
+  }
+
+  for (i = 0, iMax = selection.length; i < iMax; i++) {
+    // add each of the new selections, but only when they are not duplicate
+    var id = selection[i];
+    var isDuplicate = (this.selection.indexOf(id) != -1);
+    if (!isDuplicate) {
+      this.nodes[id].select();
+      this.selection.push(id);
+      changed = true;
+    }
+  }
+
+  if (changed) {
+    // fire the select event
+    this._trigger('select');
+  }
+
+  return changed;
+};
+
+/**
+ * retrieve all nodes overlapping with given object
+ * @param {Object} obj  An object with parameters left, top, right, bottom
+ * @return {Number[]}   An array with id's of the overlapping nodes
+ * @private
+ */
+Graph.prototype._getNodesOverlappingWith = function (obj) {
+  var nodes = this.nodes,
+      overlappingNodes = [];
+
+  for (var id in nodes) {
+    if (nodes.hasOwnProperty(id)) {
+      if (nodes[id].isOverlappingWith(obj)) {
+        overlappingNodes.push(id);
+      }
+    }
+  }
+
+  return overlappingNodes;
+};
+
+/**
+ * retrieve the currently selected nodes
+ * @return {Number[] | String[]} selection    An array with the ids of the
+ *                                            selected nodes.
+ */
+Graph.prototype.getSelection = function() {
+  return this.selection.concat([]);
+};
+
+/**
+ * select zero or more nodes
+ * @param {Number[] | String[]} selection     An array with the ids of the
+ *                                            selected nodes.
+ */
+Graph.prototype.setSelection = function(selection) {
+  var i, iMax, id;
+
+  if (!selection || (selection.length == undefined))
+    throw 'Selection must be an array with ids';
+
+  // first unselect any selected node
+  for (i = 0, iMax = this.selection.length; i < iMax; i++) {
+    id = this.selection[i];
+    this.nodes[id].unselect();
+  }
+
+  this.selection = [];
+
+  for (i = 0, iMax = selection.length; i < iMax; i++) {
+    id = selection[i];
+
+    var node = this.nodes[id];
+    if (!node) {
+      throw new RangeError('Node with id "' + id + '" not found');
+    }
+    node.select();
+    this.selection.push(id);
+  }
+
+  this.redraw();
+};
+
+/**
+ * Validate the selection: remove ids of nodes which no longer exist
+ * @private
+ */
+Graph.prototype._updateSelection = function () {
+  var i = 0;
+  while (i < this.selection.length) {
+    var id = this.selection[i];
+    if (!this.nodes[id]) {
+      this.selection.splice(i, 1);
+    }
+    else {
+      i++;
+    }
+  }
+};
+
+/**
+ * Temporary method to test calculating a hub value for the nodes
+ * @param {number} level        Maximum number edges between two nodes in order
+ *                              to call them connected. Optional, 1 by default
+ * @return {Number[]} connectioncount array with the connection count
+ *                                    for each node
+ * @private
+ */
+Graph.prototype._getConnectionCount = function(level) {
+  if (level == undefined) {
+    level = 1;
+  }
+
+  // get the nodes connected to given nodes
+  function getConnectedNodes(nodes) {
+    var connectedNodes = [];
+
+    for (var j = 0, jMax = nodes.length; j < jMax; j++) {
+      var node = nodes[j];
+
+      // find all nodes connected to this node
+      var edges = node.edges;
+      for (var i = 0, iMax = edges.length; i < iMax; i++) {
+        var edge = edges[i];
+        var other = null;
+
+        // check if connected
+        if (edge.from == node)
+          other = edge.to;
+        else if (edge.to == node)
+          other = edge.from;
+
+        // check if the other node is not already in the list with nodes
+        var k, kMax;
+        if (other) {
+          for (k = 0, kMax = nodes.length; k < kMax; k++) {
+            if (nodes[k] == other) {
+              other = null;
+              break;
+            }
+          }
+        }
+        if (other) {
+          for (k = 0, kMax = connectedNodes.length; k < kMax; k++) {
+            if (connectedNodes[k] == other) {
+              other = null;
+              break;
+            }
+          }
+        }
+
+        if (other)
+          connectedNodes.push(other);
+      }
+    }
+
+    return connectedNodes;
+  }
+
+  var connections = [];
+  var nodes = this.nodes;
+  for (var id in nodes) {
+    if (nodes.hasOwnProperty(id)) {
+      var c = [nodes[id]];
+      for (var l = 0; l < level; l++) {
+        c = c.concat(getConnectedNodes(c));
+      }
+      connections.push(c);
+    }
+  }
+
+  var hubs = [];
+  for (var i = 0, len = connections.length; i < len; i++) {
+    hubs.push(connections[i].length);
+  }
+
+  return hubs;
+};
+
+
+/**
+ * Set a new size for the graph
+ * @param {string} width   Width in pixels or percentage (for example '800px'
+ *                         or '50%')
+ * @param {string} height  Height in pixels or percentage  (for example '400px'
+ *                         or '30%')
+ */
+Graph.prototype.setSize = function(width, height) {
+  this.frame.style.width = width;
+  this.frame.style.height = height;
+
+  this.frame.canvas.style.width = '100%';
+  this.frame.canvas.style.height = '100%';
+
+  this.frame.canvas.width = this.frame.canvas.clientWidth;
+  this.frame.canvas.height = this.frame.canvas.clientHeight;
+};
+
+/**
+ * Set a data set with nodes for the graph
+ * @param {Array | DataSet | DataView} nodes         The data containing the nodes.
+ * @private
+ */
+Graph.prototype._setNodes = function(nodes) {
+  var oldNodesData = this.nodesData;
+
+  if (nodes instanceof DataSet || nodes instanceof DataView) {
+    this.nodesData = nodes;
+  }
+  else if (nodes instanceof Array) {
+    this.nodesData = new DataSet();
+    this.nodesData.add(nodes);
+  }
+  else if (!nodes) {
+    this.nodesData = new DataSet();
+  }
+  else {
+    throw new TypeError('Array or DataSet expected');
+  }
+
+  if (oldNodesData) {
+    // unsubscribe from old dataset
+    util.forEach(this.nodesListeners, function (callback, event) {
+      oldNodesData.unsubscribe(event, callback);
+    });
+  }
+
+  // remove drawn nodes
+  this.nodes = {};
+
+  if (this.nodesData) {
+    // subscribe to new dataset
+    var me = this;
+    util.forEach(this.nodesListeners, function (callback, event) {
+      me.nodesData.subscribe(event, callback);
+    });
+
+    // draw all new nodes
+    var ids = this.nodesData.getIds();
+    this._addNodes(ids);
+  }
+
+  this._updateSelection();
+};
+
+/**
+ * Add nodes
+ * @param {Number[] | String[]} ids
+ * @private
+ */
+Graph.prototype._addNodes = function(ids) {
+  var id;
+  for (var i = 0, len = ids.length; i < len; i++) {
+    id = ids[i];
+    var data = this.nodesData.get(id);
+    var node = new Node(data, this.images, this.groups, this.constants);
+    this.nodes[id] = node; // note: this may replace an existing node
+
+    if (!node.isFixed()) {
+      // TODO: position new nodes in a smarter way!
+      var radius = this.constants.edges.length * 2;
+      var count = ids.length;
+      var angle = 2 * Math.PI * (i / count);
+      node.x = radius * Math.cos(angle);
+      node.y = radius * Math.sin(angle);
+
+      // note: no not use node.isMoving() here, as that gives the current
+      // velocity of the node, which is zero after creation of the node.
+      this.moving = true;
+    }
+  }
+
+  this._reconnectEdges();
+  this._updateValueRange(this.nodes);
+};
+
+/**
+ * Update existing nodes, or create them when not yet existing
+ * @param {Number[] | String[]} ids
+ * @private
+ */
+Graph.prototype._updateNodes = function(ids) {
+  var nodes = this.nodes,
+      nodesData = this.nodesData;
+  for (var i = 0, len = ids.length; i < len; i++) {
+    var id = ids[i];
+    var node = nodes[id];
+    var data = nodesData.get(id);
+    if (node) {
+      // update node
+      node.setProperties(data, this.constants);
+    }
+    else {
+      // create node
+      node = new Node(properties, this.images, this.groups, this.constants);
+      nodes[id] = node;
+
+      if (!node.isFixed()) {
+        this.moving = true;
+      }
+    }
+  }
+
+  this._reconnectEdges();
+  this._updateValueRange(nodes);
+};
+
+/**
+ * Remove existing nodes. If nodes do not exist, the method will just ignore it.
+ * @param {Number[] | String[]} ids
+ * @private
+ */
+Graph.prototype._removeNodes = function(ids) {
+  var nodes = this.nodes;
+  for (var i = 0, len = ids.length; i < len; i++) {
+    var id = ids[i];
+    delete nodes[id];
+  }
+
+  this._reconnectEdges();
+  this._updateSelection();
+  this._updateValueRange(nodes);
+};
+
+/**
+ * Load edges by reading the data table
+ * @param {Array | DataSet | DataView} edges    The data containing the edges.
+ * @private
+ * @private
+ */
+Graph.prototype._setEdges = function(edges) {
+  var oldEdgesData = this.edgesData;
+
+  if (edges instanceof DataSet || edges instanceof DataView) {
+    this.edgesData = edges;
+  }
+  else if (edges instanceof Array) {
+    this.edgesData = new DataSet();
+    this.edgesData.add(edges);
+  }
+  else if (!edges) {
+    this.edgesData = new DataSet();
+  }
+  else {
+    throw new TypeError('Array or DataSet expected');
+  }
+
+  if (oldEdgesData) {
+    // unsubscribe from old dataset
+    util.forEach(this.edgesListeners, function (callback, event) {
+      oldEdgesData.unsubscribe(event, callback);
+    });
+  }
+
+  // remove drawn edges
+  this.edges = {};
+
+  if (this.edgesData) {
+    // subscribe to new dataset
+    var me = this;
+    util.forEach(this.edgesListeners, function (callback, event) {
+      me.edgesData.subscribe(event, callback);
+    });
+
+    // draw all new nodes
+    var ids = this.edgesData.getIds();
+    this._addEdges(ids);
+  }
+
+  this._reconnectEdges();
+};
+
+/**
+ * Add edges
+ * @param {Number[] | String[]} ids
+ * @private
+ */
+Graph.prototype._addEdges = function (ids) {
+  var edges = this.edges,
+      edgesData = this.edgesData;
+  for (var i = 0, len = ids.length; i < len; i++) {
+    var id = ids[i];
+
+    var oldEdge = edges[id];
+    if (oldEdge) {
+      oldEdge.disconnect();
+    }
+
+    var data = edgesData.get(id);
+    edges[id] = new Edge(data, this, this.constants);
+  }
+
+  this.moving = true;
+  this._updateValueRange(edges);
+};
+
+/**
+ * Update existing edges, or create them when not yet existing
+ * @param {Number[] | String[]} ids
+ * @private
+ */
+Graph.prototype._updateEdges = function (ids) {
+  var edges = this.edges,
+      edgesData = this.edgesData;
+  for (var i = 0, len = ids.length; i < len; i++) {
+    var id = ids[i];
+
+    var data = edgesData.get(id);
+    var edge = edges[id];
+    if (edge) {
+      // update edge
+      edge.disconnect();
+      edge.setProperties(data, this.constants);
+      edge.connect();
+    }
+    else {
+      // create edge
+      edge = new Edge(data, this, this.constants);
+      this.edges[id] = edge;
+    }
+  }
+
+  this.moving = true;
+  this._updateValueRange(edges);
+};
+
+/**
+ * Remove existing edges. Non existing ids will be ignored
+ * @param {Number[] | String[]} ids
+ * @private
+ */
+Graph.prototype._removeEdges = function (ids) {
+  var edges = this.edges;
+  for (var i = 0, len = ids.length; i < len; i++) {
+    var id = ids[i];
+    var edge = edges[id];
+    if (edge) {
+      edge.disconnect();
+      delete edges[id];
+    }
+  }
+
+  this.moving = true;
+  this._updateValueRange(edges);
+};
+
+/**
+ * Reconnect all edges
+ * @private
+ */
+Graph.prototype._reconnectEdges = function() {
+  var id,
+      nodes = this.nodes,
+      edges = this.edges;
+  for (id in nodes) {
+    if (nodes.hasOwnProperty(id)) {
+      nodes[id].edges = [];
+    }
+  }
+
+  for (id in edges) {
+    if (edges.hasOwnProperty(id)) {
+      var edge = edges[id];
+      edge.from = null;
+      edge.to = null;
+      edge.connect();
+    }
+  }
+};
+
+/**
+ * Update the values of all object in the given array according to the current
+ * value range of the objects in the array.
+ * @param {Object} obj    An object containing a set of Edges or Nodes
+ *                        The objects must have a method getValue() and
+ *                        setValueRange(min, max).
+ * @private
+ */
+Graph.prototype._updateValueRange = function(obj) {
+  var id;
+
+  // determine the range of the objects
+  var valueMin = undefined;
+  var valueMax = undefined;
+  for (id in obj) {
+    if (obj.hasOwnProperty(id)) {
+      var value = obj[id].getValue();
+      if (value !== undefined) {
+        valueMin = (valueMin === undefined) ? value : Math.min(value, valueMin);
+        valueMax = (valueMax === undefined) ? value : Math.max(value, valueMax);
+      }
+    }
+  }
+
+  // adjust the range of all objects
+  if (valueMin !== undefined && valueMax !== undefined) {
+    for (id in obj) {
+      if (obj.hasOwnProperty(id)) {
+        obj[id].setValueRange(valueMin, valueMax);
+      }
+    }
+  }
+};
+
+/**
+ * Redraw the graph with the current data
+ * chart will be resized too.
+ */
+Graph.prototype.redraw = function() {
+  this.setSize(this.width, this.height);
+
+  this._redraw();
+};
+
+/**
+ * Redraw the graph with the current data
+ * @private
+ */
+Graph.prototype._redraw = function() {
+  var ctx = this.frame.canvas.getContext('2d');
+
+  // clear the canvas
+  var w = this.frame.canvas.width;
+  var h = this.frame.canvas.height;
+  ctx.clearRect(0, 0, w, h);
+
+  // set scaling and translation
+  ctx.save();
+  ctx.translate(this.translation.x, this.translation.y);
+  ctx.scale(this.scale, this.scale);
+
+  this._drawEdges(ctx);
+  this._drawNodes(ctx);
+
+  // restore original scaling and translation
+  ctx.restore();
+};
+
+/**
+ * Set the translation of the graph
+ * @param {Number} offsetX    Horizontal offset
+ * @param {Number} offsetY    Vertical offset
+ * @private
+ */
+Graph.prototype._setTranslation = function(offsetX, offsetY) {
+  if (this.translation === undefined) {
+    this.translation = {
+      x: 0,
+      y: 0
+    };
+  }
+
+  if (offsetX !== undefined) {
+    this.translation.x = offsetX;
+  }
+  if (offsetY !== undefined) {
+    this.translation.y = offsetY;
+  }
+};
+
+/**
+ * Get the translation of the graph
+ * @return {Object} translation    An object with parameters x and y, both a number
+ * @private
+ */
+Graph.prototype._getTranslation = function() {
+  return {
+    x: this.translation.x,
+    y: this.translation.y
+  };
+};
+
+/**
+ * Scale the graph
+ * @param {Number} scale   Scaling factor 1.0 is unscaled
+ * @private
+ */
+Graph.prototype._setScale = function(scale) {
+  this.scale = scale;
+};
+/**
+ * Get the current scale of  the graph
+ * @return {Number} scale   Scaling factor 1.0 is unscaled
+ * @private
+ */
+Graph.prototype._getScale = function() {
+  return this.scale;
+};
+
+/**
+ * Convert a horizontal point on the HTML canvas to the x-value of the model
+ * @param {number} x
+ * @returns {number}
+ * @private
+ */
+Graph.prototype._canvasToX = function(x) {
+  return (x - this.translation.x) / this.scale;
+};
+
+/**
+ * Convert an x-value in the model to a horizontal point on the HTML canvas
+ * @param {number} x
+ * @returns {number}
+ * @private
+ */
+Graph.prototype._xToCanvas = function(x) {
+  return x * this.scale + this.translation.x;
+};
+
+/**
+ * Convert a vertical point on the HTML canvas to the y-value of the model
+ * @param {number} y
+ * @returns {number}
+ * @private
+ */
+Graph.prototype._canvasToY = function(y) {
+  return (y - this.translation.y) / this.scale;
+};
+
+/**
+ * Convert an y-value in the model to a vertical point on the HTML canvas
+ * @param {number} y
+ * @returns {number}
+ * @private
+ */
+Graph.prototype._yToCanvas = function(y) {
+  return y * this.scale + this.translation.y ;
+};
+
+/**
+ * Redraw all nodes
+ * The 2d context of a HTML canvas can be retrieved by canvas.getContext('2d');
+ * @param {CanvasRenderingContext2D}   ctx
+ * @private
+ */
+Graph.prototype._drawNodes = function(ctx) {
+  // first draw the unselected nodes
+  var nodes = this.nodes;
+  var selected = [];
+  for (var id in nodes) {
+    if (nodes.hasOwnProperty(id)) {
+      if (nodes[id].isSelected()) {
+        selected.push(id);
+      }
+      else {
+        nodes[id].draw(ctx);
+      }
+    }
+  }
+
+  // draw the selected nodes on top
+  for (var s = 0, sMax = selected.length; s < sMax; s++) {
+    nodes[selected[s]].draw(ctx);
+  }
+};
+
+/**
+ * Redraw all edges
+ * The 2d context of a HTML canvas can be retrieved by canvas.getContext('2d');
+ * @param {CanvasRenderingContext2D}   ctx
+ * @private
+ */
+Graph.prototype._drawEdges = function(ctx) {
+  var edges = this.edges;
+  for (var id in edges) {
+    if (edges.hasOwnProperty(id)) {
+      var edge = edges[id];
+      if (edge.connected) {
+        edges[id].draw(ctx);
+      }
+    }
+  }
+};
+
+/**
+ * Find a stable position for all nodes
+ * @private
+ */
+Graph.prototype._doStabilize = function() {
+  var start = new Date();
+
+  // find stable position
+  var count = 0;
+  var vmin = this.constants.minVelocity;
+  var stable = false;
+  while (!stable && count < this.constants.maxIterations) {
+    this._calculateForces();
+    this._discreteStepNodes();
+    stable = !this._isMoving(vmin);
+    count++;
+  }
+
+  var end = new Date();
+
+  // console.log('Stabilized in ' + (end-start) + ' ms, ' + count + ' iterations' ); // TODO: cleanup
+};
+
+/**
+ * Calculate the external forces acting on the nodes
+ * Forces are caused by: edges, repulsing forces between nodes, gravity
+ * @private
+ */
+Graph.prototype._calculateForces = function() {
+  // create a local edge to the nodes and edges, that is faster
+  var id, dx, dy, angle, distance, fx, fy,
+      repulsingForce, springForce, length, edgeLength,
+      nodes = this.nodes,
+      edges = this.edges;
+
+  // gravity, add a small constant force to pull the nodes towards the center of
+  // the graph
+  // Also, the forces are reset to zero in this loop by using _setForce instead
+  // of _addForce
+  var gravity = 0.01,
+      gx = this.frame.canvas.clientWidth / 2,
+      gy = this.frame.canvas.clientHeight / 2;
+  for (id in nodes) {
+    if (nodes.hasOwnProperty(id)) {
+      var node = nodes[id];
+      dx = gx - node.x;
+      dy = gy - node.y;
+      angle = Math.atan2(dy, dx);
+      fx = Math.cos(angle) * gravity;
+      fy = Math.sin(angle) * gravity;
+
+      node._setForce(fx, fy);
+    }
+  }
+
+  // repulsing forces between nodes
+  var minimumDistance = this.constants.nodes.distance,
+      steepness = 10; // higher value gives steeper slope of the force around the given minimumDistance
+
+  for (var id1 in nodes) {
+    if (nodes.hasOwnProperty(id1)) {
+      var node1 = nodes[id1];
+      for (var id2 in nodes) {
+        if (nodes.hasOwnProperty(id2)) {
+          var node2 = nodes[id2];
+          // calculate normally distributed force
+          dx = node2.x - node1.x;
+          dy = node2.y - node1.y;
+          distance = Math.sqrt(dx * dx + dy * dy);
+          angle = Math.atan2(dy, dx);
+
+          // TODO: correct factor for repulsing force
+          //repulsingForce = 2 * Math.exp(-5 * (distance * distance) / (dmin * dmin) ); // TODO: customize the repulsing force
+          //repulsingForce = Math.exp(-1 * (distance * distance) / (dmin * dmin) ); // TODO: customize the repulsing force
+          repulsingForce = 1 / (1 + Math.exp((distance / minimumDistance - 1) * steepness)); // TODO: customize the repulsing force
+          fx = Math.cos(angle) * repulsingForce;
+          fy = Math.sin(angle) * repulsingForce;
+
+          node1._addForce(-fx, -fy);
+          node2._addForce(fx, fy);
+        }
+      }
+    }
+  }
+
+  /* TODO: re-implement repulsion of edges
+   for (var n = 0; n < nodes.length; n++) {
+   for (var l = 0; l < edges.length; l++) {
+   var lx = edges[l].from.x+(edges[l].to.x - edges[l].from.x)/2,
+   ly = edges[l].from.y+(edges[l].to.y - edges[l].from.y)/2,
+
+   // calculate normally distributed force
+   dx = nodes[n].x - lx,
+   dy = nodes[n].y - ly,
+   distance = Math.sqrt(dx * dx + dy * dy),
+   angle = Math.atan2(dy, dx),
+
+
+   // TODO: correct factor for repulsing force
+   //var repulsingforce = 2 * Math.exp(-5 * (distance * distance) / (dmin * dmin) ); // TODO: customize the repulsing force
+   //repulsingforce = Math.exp(-1 * (distance * distance) / (dmin * dmin) ), // TODO: customize the repulsing force
+   repulsingforce = 1 / (1 + Math.exp((distance / (minimumDistance / 2) - 1) * steepness)), // TODO: customize the repulsing force
+   fx = Math.cos(angle) * repulsingforce,
+   fy = Math.sin(angle) * repulsingforce;
+   nodes[n]._addForce(fx, fy);
+   edges[l].from._addForce(-fx/2,-fy/2);
+   edges[l].to._addForce(-fx/2,-fy/2);
+   }
+   }
+   */
+
+  // forces caused by the edges, modelled as springs
+  for (id in edges) {
+    if (edges.hasOwnProperty(id)) {
+      var edge = edges[id];
+      if (edge.connected) {
+        dx = (edge.to.x - edge.from.x);
+        dy = (edge.to.y - edge.from.y);
+        //edgeLength = (edge.from.width + edge.from.height + edge.to.width + edge.to.height)/2 || edge.length; // TODO: dmin
+        //edgeLength = (edge.from.width + edge.to.width)/2 || edge.length; // TODO: dmin
+        //edgeLength = 20 + ((edge.from.width + edge.to.width) || 0) / 2;
+        edgeLength = edge.length;
+        length =  Math.sqrt(dx * dx + dy * dy);
+        angle = Math.atan2(dy, dx);
+
+        springForce = edge.stiffness * (edgeLength - length);
+
+        fx = Math.cos(angle) * springForce;
+        fy = Math.sin(angle) * springForce;
+
+        edge.from._addForce(-fx, -fy);
+        edge.to._addForce(fx, fy);
+      }
+    }
+  }
+
+  /* TODO: re-implement repulsion of edges
+   // repulsing forces between edges
+   var minimumDistance = this.constants.edges.distance,
+   steepness = 10; // higher value gives steeper slope of the force around the given minimumDistance
+   for (var l = 0; l < edges.length; l++) {
+   //Keep distance from other edge centers
+   for (var l2 = l + 1; l2 < this.edges.length; l2++) {
+   //var dmin = (nodes[n].width + nodes[n].height + nodes[n2].width + nodes[n2].height) / 1 || minimumDistance, // TODO: dmin
+   //var dmin = (nodes[n].width + nodes[n2].width)/2  || minimumDistance, // TODO: dmin
+   //dmin = 40 + ((nodes[n].width/2 + nodes[n2].width/2) || 0),
+   var lx = edges[l].from.x+(edges[l].to.x - edges[l].from.x)/2,
+   ly = edges[l].from.y+(edges[l].to.y - edges[l].from.y)/2,
+   l2x = edges[l2].from.x+(edges[l2].to.x - edges[l2].from.x)/2,
+   l2y = edges[l2].from.y+(edges[l2].to.y - edges[l2].from.y)/2,
+
+   // calculate normally distributed force
+   dx = l2x - lx,
+   dy = l2y - ly,
+   distance = Math.sqrt(dx * dx + dy * dy),
+   angle = Math.atan2(dy, dx),
+
+
+   // TODO: correct factor for repulsing force
+   //var repulsingforce = 2 * Math.exp(-5 * (distance * distance) / (dmin * dmin) ); // TODO: customize the repulsing force
+   //repulsingforce = Math.exp(-1 * (distance * distance) / (dmin * dmin) ), // TODO: customize the repulsing force
+   repulsingforce = 1 / (1 + Math.exp((distance / minimumDistance - 1) * steepness)), // TODO: customize the repulsing force
+   fx = Math.cos(angle) * repulsingforce,
+   fy = Math.sin(angle) * repulsingforce;
+
+   edges[l].from._addForce(-fx, -fy);
+   edges[l].to._addForce(-fx, -fy);
+   edges[l2].from._addForce(fx, fy);
+   edges[l2].to._addForce(fx, fy);
+   }
+   }
+   */
+};
+
+
+/**
+ * Check if any of the nodes is still moving
+ * @param {number} vmin   the minimum velocity considered as 'moving'
+ * @return {boolean}      true if moving, false if non of the nodes is moving
+ * @private
+ */
+Graph.prototype._isMoving = function(vmin) {
+  // TODO: ismoving does not work well: should check the kinetic energy, not its velocity
+  var nodes = this.nodes;
+  for (var id in nodes) {
+    if (nodes.hasOwnProperty(id) && nodes[id].isMoving(vmin)) {
+      return true;
+    }
+  }
+  return false;
+};
+
+
+/**
+ * Perform one discrete step for all nodes
+ * @private
+ */
+Graph.prototype._discreteStepNodes = function() {
+  var interval = this.refreshRate / 1000.0; // in seconds
+  var nodes = this.nodes;
+  for (var id in nodes) {
+    if (nodes.hasOwnProperty(id)) {
+      nodes[id].discreteStep(interval);
+    }
+  }
+};
+
+/**
+ * Start animating nodes and edges
+ */
+Graph.prototype.start = function() {
+  if (this.moving) {
+    this._calculateForces();
+    this._discreteStepNodes();
+
+    var vmin = this.constants.minVelocity;
+    this.moving = this._isMoving(vmin);
+  }
+
+  if (this.moving) {
+    // start animation. only start timer if it is not already running
+    if (!this.timer) {
+      var graph = this;
+      this.timer = window.setTimeout(function () {
+        graph.timer = undefined;
+        graph.start();
+        graph._redraw();
+      }, this.refreshRate);
+    }
+  }
+  else {
+    this._redraw();
+  }
+};
+
+/**
+ * Stop animating nodes and edges.
+ */
+Graph.prototype.stop = function () {
+  if (this.timer) {
+    window.clearInterval(this.timer);
+    this.timer = undefined;
+  }
+};
+
+/**
+ * vis.js module exports
+ */
+var vis = {
+  util: util,
+  events: events,
+
+  Controller: Controller,
+  DataSet: DataSet,
+  DataView: DataView,
+  Range: Range,
+  Stack: Stack,
+  TimeStep: TimeStep,
+  EventBus: EventBus,
+
+  components: {
+    items: {
+      Item: Item,
+      ItemBox: ItemBox,
+      ItemPoint: ItemPoint,
+      ItemRange: ItemRange
+    },
+
+    Component: Component,
+    Panel: Panel,
+    RootPanel: RootPanel,
+    ItemSet: ItemSet,
+    TimeAxis: TimeAxis
+  },
+
+  graph: {
+    Node: Node,
+    Edge: Edge,
+    Popup: Popup,
+    Groups: Groups,
+    Images: Images
+  },
+
+  Timeline: Timeline,
+  Graph: Graph
+};
+
+/**
+ * CommonJS module exports
+ */
+if (typeof exports !== 'undefined') {
+  exports = vis;
+}
+if (typeof module !== 'undefined' && typeof module.exports !== 'undefined') {
+  module.exports = vis;
+}
+
+/**
+ * AMD module exports
+ */
+if (typeof(define) === 'function') {
+  define(function () {
+    return vis;
+  });
+}
+
+/**
+ * Window exports
+ */
+if (typeof window !== 'undefined') {
+  // attach the module to the window, load as a regular javascript file
+  window['vis'] = vis;
+}
+
+
+},{"hammerjs":2,"moment":3}],2:[function(require,module,exports){
+/*! Hammer.JS - v1.0.5 - 2013-04-07
+ * http://eightmedia.github.com/hammer.js
+ *
+ * Copyright (c) 2013 Jorik Tangelder <j.tangelder@gmail.com>;
+ * Licensed under the MIT license */
+
+(function(window, undefined) {
+    'use strict';
+
+/**
+ * Hammer
+ * use this to create instances
+ * @param   {HTMLElement}   element
+ * @param   {Object}        options
+ * @returns {Hammer.Instance}
+ * @constructor
+ */
+var Hammer = function(element, options) {
+    return new Hammer.Instance(element, options || {});
+};
+
+// default settings
+Hammer.defaults = {
+    // add styles and attributes to the element to prevent the browser from doing
+    // its native behavior. this doesnt prevent the scrolling, but cancels
+    // the contextmenu, tap highlighting etc
+    // set to false to disable this
+    stop_browser_behavior: {
+		// this also triggers onselectstart=false for IE
+        userSelect: 'none',
+		// this makes the element blocking in IE10 >, you could experiment with the value
+		// see for more options this issue; https://github.com/EightMedia/hammer.js/issues/241
+        touchAction: 'none',
+		touchCallout: 'none',
+        contentZooming: 'none',
+        userDrag: 'none',
+        tapHighlightColor: 'rgba(0,0,0,0)'
+    }
+
+    // more settings are defined per gesture at gestures.js
+};
+
+// detect touchevents
+Hammer.HAS_POINTEREVENTS = navigator.pointerEnabled || navigator.msPointerEnabled;
+Hammer.HAS_TOUCHEVENTS = ('ontouchstart' in window);
+
+// dont use mouseevents on mobile devices
+Hammer.MOBILE_REGEX = /mobile|tablet|ip(ad|hone|od)|android/i;
+Hammer.NO_MOUSEEVENTS = Hammer.HAS_TOUCHEVENTS && navigator.userAgent.match(Hammer.MOBILE_REGEX);
+
+// eventtypes per touchevent (start, move, end)
+// are filled by Hammer.event.determineEventTypes on setup
+Hammer.EVENT_TYPES = {};
+
+// direction defines
+Hammer.DIRECTION_DOWN = 'down';
+Hammer.DIRECTION_LEFT = 'left';
+Hammer.DIRECTION_UP = 'up';
+Hammer.DIRECTION_RIGHT = 'right';
+
+// pointer type
+Hammer.POINTER_MOUSE = 'mouse';
+Hammer.POINTER_TOUCH = 'touch';
+Hammer.POINTER_PEN = 'pen';
+
+// touch event defines
+Hammer.EVENT_START = 'start';
+Hammer.EVENT_MOVE = 'move';
+Hammer.EVENT_END = 'end';
+
+// hammer document where the base events are added at
+Hammer.DOCUMENT = document;
+
+// plugins namespace
+Hammer.plugins = {};
+
+// if the window events are set...
+Hammer.READY = false;
+
+/**
+ * setup events to detect gestures on the document
+ */
+function setup() {
+    if(Hammer.READY) {
+        return;
+    }
+
+    // find what eventtypes we add listeners to
+    Hammer.event.determineEventTypes();
+
+    // Register all gestures inside Hammer.gestures
+    for(var name in Hammer.gestures) {
+        if(Hammer.gestures.hasOwnProperty(name)) {
+            Hammer.detection.register(Hammer.gestures[name]);
+        }
+    }
+
+    // Add touch events on the document
+    Hammer.event.onTouch(Hammer.DOCUMENT, Hammer.EVENT_MOVE, Hammer.detection.detect);
+    Hammer.event.onTouch(Hammer.DOCUMENT, Hammer.EVENT_END, Hammer.detection.detect);
+
+    // Hammer is ready...!
+    Hammer.READY = true;
+}
+
+/**
+ * create new hammer instance
+ * all methods should return the instance itself, so it is chainable.
+ * @param   {HTMLElement}       element
+ * @param   {Object}            [options={}]
+ * @returns {Hammer.Instance}
+ * @constructor
+ */
+Hammer.Instance = function(element, options) {
+    var self = this;
+
+    // setup HammerJS window events and register all gestures
+    // this also sets up the default options
+    setup();
+
+    this.element = element;
+
+    // start/stop detection option
+    this.enabled = true;
+
+    // merge options
+    this.options = Hammer.utils.extend(
+        Hammer.utils.extend({}, Hammer.defaults),
+        options || {});
+
+    // add some css to the element to prevent the browser from doing its native behavoir
+    if(this.options.stop_browser_behavior) {
+        Hammer.utils.stopDefaultBrowserBehavior(this.element, this.options.stop_browser_behavior);
+    }
+
+    // start detection on touchstart
+    Hammer.event.onTouch(element, Hammer.EVENT_START, function(ev) {
+        if(self.enabled) {
+            Hammer.detection.startDetect(self, ev);
+        }
+    });
+
+    // return instance
+    return this;
+};
+
+
+Hammer.Instance.prototype = {
+    /**
+     * bind events to the instance
+     * @param   {String}      gesture
+     * @param   {Function}    handler
+     * @returns {Hammer.Instance}
+     */
+    on: function onEvent(gesture, handler){
+        var gestures = gesture.split(' ');
+        for(var t=0; t<gestures.length; t++) {
+            this.element.addEventListener(gestures[t], handler, false);
+        }
+        return this;
+    },
+
+
+    /**
+     * unbind events to the instance
+     * @param   {String}      gesture
+     * @param   {Function}    handler
+     * @returns {Hammer.Instance}
+     */
+    off: function offEvent(gesture, handler){
+        var gestures = gesture.split(' ');
+        for(var t=0; t<gestures.length; t++) {
+            this.element.removeEventListener(gestures[t], handler, false);
+        }
+        return this;
+    },
+
+
+    /**
+     * trigger gesture event
+     * @param   {String}      gesture
+     * @param   {Object}      eventData
+     * @returns {Hammer.Instance}
+     */
+    trigger: function triggerEvent(gesture, eventData){
+        // create DOM event
+        var event = Hammer.DOCUMENT.createEvent('Event');
+		event.initEvent(gesture, true, true);
+		event.gesture = eventData;
+
+        // trigger on the target if it is in the instance element,
+        // this is for event delegation tricks
+        var element = this.element;
+        if(Hammer.utils.hasParent(eventData.target, element)) {
+            element = eventData.target;
+        }
+
+        element.dispatchEvent(event);
+        return this;
+    },
+
+
+    /**
+     * enable of disable hammer.js detection
+     * @param   {Boolean}   state
+     * @returns {Hammer.Instance}
+     */
+    enable: function enable(state) {
+        this.enabled = state;
+        return this;
+    }
+};
+
+/**
+ * this holds the last move event,
+ * used to fix empty touchend issue
+ * see the onTouch event for an explanation
+ * @type {Object}
+ */
+var last_move_event = null;
+
+
+/**
+ * when the mouse is hold down, this is true
+ * @type {Boolean}
+ */
+var enable_detect = false;
+
+
+/**
+ * when touch events have been fired, this is true
+ * @type {Boolean}
+ */
+var touch_triggered = false;
+
+
+Hammer.event = {
+    /**
+     * simple addEventListener
+     * @param   {HTMLElement}   element
+     * @param   {String}        type
+     * @param   {Function}      handler
+     */
+    bindDom: function(element, type, handler) {
+        var types = type.split(' ');
+        for(var t=0; t<types.length; t++) {
+            element.addEventListener(types[t], handler, false);
+        }
+    },
+
+
+    /**
+     * touch events with mouse fallback
+     * @param   {HTMLElement}   element
+     * @param   {String}        eventType        like Hammer.EVENT_MOVE
+     * @param   {Function}      handler
+     */
+    onTouch: function onTouch(element, eventType, handler) {
+		var self = this;
+
+        this.bindDom(element, Hammer.EVENT_TYPES[eventType], function bindDomOnTouch(ev) {
+            var sourceEventType = ev.type.toLowerCase();
+
+            // onmouseup, but when touchend has been fired we do nothing.
+            // this is for touchdevices which also fire a mouseup on touchend
+            if(sourceEventType.match(/mouse/) && touch_triggered) {
+                return;
+            }
+
+            // mousebutton must be down or a touch event
+            else if( sourceEventType.match(/touch/) ||   // touch events are always on screen
+                sourceEventType.match(/pointerdown/) || // pointerevents touch
+                (sourceEventType.match(/mouse/) && ev.which === 1)   // mouse is pressed
+            ){
+                enable_detect = true;
+            }
+
+            // we are in a touch event, set the touch triggered bool to true,
+            // this for the conflicts that may occur on ios and android
+            if(sourceEventType.match(/touch|pointer/)) {
+                touch_triggered = true;
+            }
+
+            // count the total touches on the screen
+            var count_touches = 0;
+
+            // when touch has been triggered in this detection session
+            // and we are now handling a mouse event, we stop that to prevent conflicts
+            if(enable_detect) {
+                // update pointerevent
+                if(Hammer.HAS_POINTEREVENTS && eventType != Hammer.EVENT_END) {
+                    count_touches = Hammer.PointerEvent.updatePointer(eventType, ev);
+                }
+                // touch
+                else if(sourceEventType.match(/touch/)) {
+                    count_touches = ev.touches.length;
+                }
+                // mouse
+                else if(!touch_triggered) {
+                    count_touches = sourceEventType.match(/up/) ? 0 : 1;
+                }
+
+                // if we are in a end event, but when we remove one touch and
+                // we still have enough, set eventType to move
+                if(count_touches > 0 && eventType == Hammer.EVENT_END) {
+                    eventType = Hammer.EVENT_MOVE;
+                }
+                // no touches, force the end event
+                else if(!count_touches) {
+                    eventType = Hammer.EVENT_END;
+                }
+
+                // because touchend has no touches, and we often want to use these in our gestures,
+                // we send the last move event as our eventData in touchend
+                if(!count_touches && last_move_event !== null) {
+                    ev = last_move_event;
+                }
+                // store the last move event
+                else {
+                    last_move_event = ev;
+                }
+
+                // trigger the handler
+                handler.call(Hammer.detection, self.collectEventData(element, eventType, ev));
+
+                // remove pointerevent from list
+                if(Hammer.HAS_POINTEREVENTS && eventType == Hammer.EVENT_END) {
+                    count_touches = Hammer.PointerEvent.updatePointer(eventType, ev);
+                }
+            }
+
+            //debug(sourceEventType +" "+ eventType);
+
+            // on the end we reset everything
+            if(!count_touches) {
+                last_move_event = null;
+                enable_detect = false;
+                touch_triggered = false;
+                Hammer.PointerEvent.reset();
+            }
+        });
+    },
+
+
+    /**
+     * we have different events for each device/browser
+     * determine what we need and set them in the Hammer.EVENT_TYPES constant
+     */
+    determineEventTypes: function determineEventTypes() {
+        // determine the eventtype we want to set
+        var types;
+
+        // pointerEvents magic
+        if(Hammer.HAS_POINTEREVENTS) {
+            types = Hammer.PointerEvent.getEvents();
+        }
+        // on Android, iOS, blackberry, windows mobile we dont want any mouseevents
+        else if(Hammer.NO_MOUSEEVENTS) {
+            types = [
+                'touchstart',
+                'touchmove',
+                'touchend touchcancel'];
+        }
+        // for non pointer events browsers and mixed browsers,
+        // like chrome on windows8 touch laptop
+        else {
+            types = [
+                'touchstart mousedown',
+                'touchmove mousemove',
+                'touchend touchcancel mouseup'];
+        }
+
+        Hammer.EVENT_TYPES[Hammer.EVENT_START]  = types[0];
+        Hammer.EVENT_TYPES[Hammer.EVENT_MOVE]   = types[1];
+        Hammer.EVENT_TYPES[Hammer.EVENT_END]    = types[2];
+    },
+
+
+    /**
+     * create touchlist depending on the event
+     * @param   {Object}    ev
+     * @param   {String}    eventType   used by the fakemultitouch plugin
+     */
+    getTouchList: function getTouchList(ev/*, eventType*/) {
+        // get the fake pointerEvent touchlist
+        if(Hammer.HAS_POINTEREVENTS) {
+            return Hammer.PointerEvent.getTouchList();
+        }
+        // get the touchlist
+        else if(ev.touches) {
+            return ev.touches;
+        }
+        // make fake touchlist from mouse position
+        else {
+            return [{
+                identifier: 1,
+                pageX: ev.pageX,
+                pageY: ev.pageY,
+                target: ev.target
+            }];
+        }
+    },
+
+
+    /**
+     * collect event data for Hammer js
+     * @param   {HTMLElement}   element
+     * @param   {String}        eventType        like Hammer.EVENT_MOVE
+     * @param   {Object}        eventData
+     */
+    collectEventData: function collectEventData(element, eventType, ev) {
+        var touches = this.getTouchList(ev, eventType);
+
+        // find out pointerType
+        var pointerType = Hammer.POINTER_TOUCH;
+        if(ev.type.match(/mouse/) || Hammer.PointerEvent.matchType(Hammer.POINTER_MOUSE, ev)) {
+            pointerType = Hammer.POINTER_MOUSE;
+        }
+
+        return {
+            center      : Hammer.utils.getCenter(touches),
+            timeStamp   : new Date().getTime(),
+            target      : ev.target,
+            touches     : touches,
+            eventType   : eventType,
+            pointerType : pointerType,
+            srcEvent    : ev,
+
+            /**
+             * prevent the browser default actions
+             * mostly used to disable scrolling of the browser
+             */
+            preventDefault: function() {
+                if(this.srcEvent.preventManipulation) {
+                    this.srcEvent.preventManipulation();
+                }
+
+                if(this.srcEvent.preventDefault) {
+                    this.srcEvent.preventDefault();
+                }
+            },
+
+            /**
+             * stop bubbling the event up to its parents
+             */
+            stopPropagation: function() {
+                this.srcEvent.stopPropagation();
+            },
+
+            /**
+             * immediately stop gesture detection
+             * might be useful after a swipe was detected
+             * @return {*}
+             */
+            stopDetect: function() {
+                return Hammer.detection.stopDetect();
+            }
+        };
+    }
+};
+
+Hammer.PointerEvent = {
+    /**
+     * holds all pointers
+     * @type {Object}
+     */
+    pointers: {},
+
+    /**
+     * get a list of pointers
+     * @returns {Array}     touchlist
+     */
+    getTouchList: function() {
+        var self = this;
+        var touchlist = [];
+
+        // we can use forEach since pointerEvents only is in IE10
+        Object.keys(self.pointers).sort().forEach(function(id) {
+            touchlist.push(self.pointers[id]);
+        });
+        return touchlist;
+    },
+
+    /**
+     * update the position of a pointer
+     * @param   {String}   type             Hammer.EVENT_END
+     * @param   {Object}   pointerEvent
+     */
+    updatePointer: function(type, pointerEvent) {
+        if(type == Hammer.EVENT_END) {
+            this.pointers = {};
+        }
+        else {
+            pointerEvent.identifier = pointerEvent.pointerId;
+            this.pointers[pointerEvent.pointerId] = pointerEvent;
+        }
+
+        return Object.keys(this.pointers).length;
+    },
+
+    /**
+     * check if ev matches pointertype
+     * @param   {String}        pointerType     Hammer.POINTER_MOUSE
+     * @param   {PointerEvent}  ev
+     */
+    matchType: function(pointerType, ev) {
+        if(!ev.pointerType) {
+            return false;
+        }
+
+        var types = {};
+        types[Hammer.POINTER_MOUSE] = (ev.pointerType == ev.MSPOINTER_TYPE_MOUSE || ev.pointerType == Hammer.POINTER_MOUSE);
+        types[Hammer.POINTER_TOUCH] = (ev.pointerType == ev.MSPOINTER_TYPE_TOUCH || ev.pointerType == Hammer.POINTER_TOUCH);
+        types[Hammer.POINTER_PEN] = (ev.pointerType == ev.MSPOINTER_TYPE_PEN || ev.pointerType == Hammer.POINTER_PEN);
+        return types[pointerType];
+    },
+
+
+    /**
+     * get events
+     */
+    getEvents: function() {
+        return [
+            'pointerdown MSPointerDown',
+            'pointermove MSPointerMove',
+            'pointerup pointercancel MSPointerUp MSPointerCancel'
+        ];
+    },
+
+    /**
+     * reset the list
+     */
+    reset: function() {
+        this.pointers = {};
+    }
+};
+
+
+Hammer.utils = {
+    /**
+     * extend method,
+     * also used for cloning when dest is an empty object
+     * @param   {Object}    dest
+     * @param   {Object}    src
+	 * @parm	{Boolean}	merge		do a merge
+     * @returns {Object}    dest
+     */
+    extend: function extend(dest, src, merge) {
+        for (var key in src) {
+			if(dest[key] !== undefined && merge) {
+				continue;
+			}
+            dest[key] = src[key];
+        }
+        return dest;
+    },
+
+
+    /**
+     * find if a node is in the given parent
+     * used for event delegation tricks
+     * @param   {HTMLElement}   node
+     * @param   {HTMLElement}   parent
+     * @returns {boolean}       has_parent
+     */
+    hasParent: function(node, parent) {
+        while(node){
+            if(node == parent) {
+                return true;
+            }
+            node = node.parentNode;
+        }
+        return false;
+    },
+
+
+    /**
+     * get the center of all the touches
+     * @param   {Array}     touches
+     * @returns {Object}    center
+     */
+    getCenter: function getCenter(touches) {
+        var valuesX = [], valuesY = [];
+
+        for(var t= 0,len=touches.length; t<len; t++) {
+            valuesX.push(touches[t].pageX);
+            valuesY.push(touches[t].pageY);
+        }
+
+        return {
+            pageX: ((Math.min.apply(Math, valuesX) + Math.max.apply(Math, valuesX)) / 2),
+            pageY: ((Math.min.apply(Math, valuesY) + Math.max.apply(Math, valuesY)) / 2)
+        };
+    },
+
+
+    /**
+     * calculate the velocity between two points
+     * @param   {Number}    delta_time
+     * @param   {Number}    delta_x
+     * @param   {Number}    delta_y
+     * @returns {Object}    velocity
+     */
+    getVelocity: function getVelocity(delta_time, delta_x, delta_y) {
+        return {
+            x: Math.abs(delta_x / delta_time) || 0,
+            y: Math.abs(delta_y / delta_time) || 0
+        };
+    },
+
+
+    /**
+     * calculate the angle between two coordinates
+     * @param   {Touch}     touch1
+     * @param   {Touch}     touch2
+     * @returns {Number}    angle
+     */
+    getAngle: function getAngle(touch1, touch2) {
+        var y = touch2.pageY - touch1.pageY,
+            x = touch2.pageX - touch1.pageX;
+        return Math.atan2(y, x) * 180 / Math.PI;
+    },
+
+
+    /**
+     * angle to direction define
+     * @param   {Touch}     touch1
+     * @param   {Touch}     touch2
+     * @returns {String}    direction constant, like Hammer.DIRECTION_LEFT
+     */
+    getDirection: function getDirection(touch1, touch2) {
+        var x = Math.abs(touch1.pageX - touch2.pageX),
+            y = Math.abs(touch1.pageY - touch2.pageY);
+
+        if(x >= y) {
+            return touch1.pageX - touch2.pageX > 0 ? Hammer.DIRECTION_LEFT : Hammer.DIRECTION_RIGHT;
+        }
+        else {
+            return touch1.pageY - touch2.pageY > 0 ? Hammer.DIRECTION_UP : Hammer.DIRECTION_DOWN;
+        }
+    },
+
+
+    /**
+     * calculate the distance between two touches
+     * @param   {Touch}     touch1
+     * @param   {Touch}     touch2
+     * @returns {Number}    distance
+     */
+    getDistance: function getDistance(touch1, touch2) {
+        var x = touch2.pageX - touch1.pageX,
+            y = touch2.pageY - touch1.pageY;
+        return Math.sqrt((x*x) + (y*y));
+    },
+
+
+    /**
+     * calculate the scale factor between two touchLists (fingers)
+     * no scale is 1, and goes down to 0 when pinched together, and bigger when pinched out
+     * @param   {Array}     start
+     * @param   {Array}     end
+     * @returns {Number}    scale
+     */
+    getScale: function getScale(start, end) {
+        // need two fingers...
+        if(start.length >= 2 && end.length >= 2) {
+            return this.getDistance(end[0], end[1]) /
+                this.getDistance(start[0], start[1]);
+        }
+        return 1;
+    },
+
+
+    /**
+     * calculate the rotation degrees between two touchLists (fingers)
+     * @param   {Array}     start
+     * @param   {Array}     end
+     * @returns {Number}    rotation
+     */
+    getRotation: function getRotation(start, end) {
+        // need two fingers
+        if(start.length >= 2 && end.length >= 2) {
+            return this.getAngle(end[1], end[0]) -
+                this.getAngle(start[1], start[0]);
+        }
+        return 0;
+    },
+
+
+    /**
+     * boolean if the direction is vertical
+     * @param    {String}    direction
+     * @returns  {Boolean}   is_vertical
+     */
+    isVertical: function isVertical(direction) {
+        return (direction == Hammer.DIRECTION_UP || direction == Hammer.DIRECTION_DOWN);
+    },
+
+
+    /**
+     * stop browser default behavior with css props
+     * @param   {HtmlElement}   element
+     * @param   {Object}        css_props
+     */
+    stopDefaultBrowserBehavior: function stopDefaultBrowserBehavior(element, css_props) {
+        var prop,
+            vendors = ['webkit','khtml','moz','ms','o',''];
+
+        if(!css_props || !element.style) {
+            return;
+        }
+
+        // with css properties for modern browsers
+        for(var i = 0; i < vendors.length; i++) {
+            for(var p in css_props) {
+                if(css_props.hasOwnProperty(p)) {
+                    prop = p;
+
+                    // vender prefix at the property
+                    if(vendors[i]) {
+                        prop = vendors[i] + prop.substring(0, 1).toUpperCase() + prop.substring(1);
+                    }
+
+                    // set the style
+                    element.style[prop] = css_props[p];
+                }
+            }
+        }
+
+        // also the disable onselectstart
+        if(css_props.userSelect == 'none') {
+            element.onselectstart = function() {
+                return false;
+            };
+        }
+    }
+};
+
+Hammer.detection = {
+    // contains all registred Hammer.gestures in the correct order
+    gestures: [],
+
+    // data of the current Hammer.gesture detection session
+    current: null,
+
+    // the previous Hammer.gesture session data
+    // is a full clone of the previous gesture.current object
+    previous: null,
+
+    // when this becomes true, no gestures are fired
+    stopped: false,
+
+
+    /**
+     * start Hammer.gesture detection
+     * @param   {Hammer.Instance}   inst
+     * @param   {Object}            eventData
+     */
+    startDetect: function startDetect(inst, eventData) {
+        // already busy with a Hammer.gesture detection on an element
+        if(this.current) {
+            return;
+        }
+
+        this.stopped = false;
+
+        this.current = {
+            inst        : inst, // reference to HammerInstance we're working for
+            startEvent  : Hammer.utils.extend({}, eventData), // start eventData for distances, timing etc
+            lastEvent   : false, // last eventData
+            name        : '' // current gesture we're in/detected, can be 'tap', 'hold' etc
+        };
+
+        this.detect(eventData);
+    },
+
+
+    /**
+     * Hammer.gesture detection
+     * @param   {Object}    eventData
+     * @param   {Object}    eventData
+     */
+    detect: function detect(eventData) {
+        if(!this.current || this.stopped) {
+            return;
+        }
+
+        // extend event data with calculations about scale, distance etc
+        eventData = this.extendEventData(eventData);
+
+        // instance options
+        var inst_options = this.current.inst.options;
+
+        // call Hammer.gesture handlers
+        for(var g=0,len=this.gestures.length; g<len; g++) {
+            var gesture = this.gestures[g];
+
+            // only when the instance options have enabled this gesture
+            if(!this.stopped && inst_options[gesture.name] !== false) {
+                // if a handler returns false, we stop with the detection
+                if(gesture.handler.call(gesture, eventData, this.current.inst) === false) {
+                    this.stopDetect();
+                    break;
+                }
+            }
+        }
+
+        // store as previous event event
+        if(this.current) {
+            this.current.lastEvent = eventData;
+        }
+
+        // endevent, but not the last touch, so dont stop
+        if(eventData.eventType == Hammer.EVENT_END && !eventData.touches.length-1) {
+            this.stopDetect();
+        }
+
+        return eventData;
+    },
+
+
+    /**
+     * clear the Hammer.gesture vars
+     * this is called on endDetect, but can also be used when a final Hammer.gesture has been detected
+     * to stop other Hammer.gestures from being fired
+     */
+    stopDetect: function stopDetect() {
+        // clone current data to the store as the previous gesture
+        // used for the double tap gesture, since this is an other gesture detect session
+        this.previous = Hammer.utils.extend({}, this.current);
+
+        // reset the current
+        this.current = null;
+
+        // stopped!
+        this.stopped = true;
+    },
+
+
+    /**
+     * extend eventData for Hammer.gestures
+     * @param   {Object}   ev
+     * @returns {Object}   ev
+     */
+    extendEventData: function extendEventData(ev) {
+        var startEv = this.current.startEvent;
+
+        // if the touches change, set the new touches over the startEvent touches
+        // this because touchevents don't have all the touches on touchstart, or the
+        // user must place his fingers at the EXACT same time on the screen, which is not realistic
+        // but, sometimes it happens that both fingers are touching at the EXACT same time
+        if(startEv && (ev.touches.length != startEv.touches.length || ev.touches === startEv.touches)) {
+            // extend 1 level deep to get the touchlist with the touch objects
+            startEv.touches = [];
+            for(var i=0,len=ev.touches.length; i<len; i++) {
+                startEv.touches.push(Hammer.utils.extend({}, ev.touches[i]));
+            }
+        }
+
+        var delta_time = ev.timeStamp - startEv.timeStamp,
+            delta_x = ev.center.pageX - startEv.center.pageX,
+            delta_y = ev.center.pageY - startEv.center.pageY,
+            velocity = Hammer.utils.getVelocity(delta_time, delta_x, delta_y);
+
+        Hammer.utils.extend(ev, {
+            deltaTime   : delta_time,
+
+            deltaX      : delta_x,
+            deltaY      : delta_y,
+
+            velocityX   : velocity.x,
+            velocityY   : velocity.y,
+
+            distance    : Hammer.utils.getDistance(startEv.center, ev.center),
+            angle       : Hammer.utils.getAngle(startEv.center, ev.center),
+            direction   : Hammer.utils.getDirection(startEv.center, ev.center),
+
+            scale       : Hammer.utils.getScale(startEv.touches, ev.touches),
+            rotation    : Hammer.utils.getRotation(startEv.touches, ev.touches),
+
+            startEvent  : startEv
+        });
+
+        return ev;
+    },
+
+
+    /**
+     * register new gesture
+     * @param   {Object}    gesture object, see gestures.js for documentation
+     * @returns {Array}     gestures
+     */
+    register: function register(gesture) {
+        // add an enable gesture options if there is no given
+        var options = gesture.defaults || {};
+        if(options[gesture.name] === undefined) {
+            options[gesture.name] = true;
+        }
+
+        // extend Hammer default options with the Hammer.gesture options
+        Hammer.utils.extend(Hammer.defaults, options, true);
+
+        // set its index
+        gesture.index = gesture.index || 1000;
+
+        // add Hammer.gesture to the list
+        this.gestures.push(gesture);
+
+        // sort the list by index
+        this.gestures.sort(function(a, b) {
+            if (a.index < b.index) {
+                return -1;
+            }
+            if (a.index > b.index) {
+                return 1;
+            }
+            return 0;
+        });
+
+        return this.gestures;
+    }
+};
+
+
+Hammer.gestures = Hammer.gestures || {};
+
+/**
+ * Custom gestures
+ * ==============================
+ *
+ * Gesture object
+ * --------------------
+ * The object structure of a gesture:
+ *
+ * { name: 'mygesture',
+ *   index: 1337,
+ *   defaults: {
+ *     mygesture_option: true
+ *   }
+ *   handler: function(type, ev, inst) {
+ *     // trigger gesture event
+ *     inst.trigger(this.name, ev);
+ *   }
+ * }
+
+ * @param   {String}    name
+ * this should be the name of the gesture, lowercase
+ * it is also being used to disable/enable the gesture per instance config.
+ *
+ * @param   {Number}    [index=1000]
+ * the index of the gesture, where it is going to be in the stack of gestures detection
+ * like when you build an gesture that depends on the drag gesture, it is a good
+ * idea to place it after the index of the drag gesture.
+ *
+ * @param   {Object}    [defaults={}]
+ * the default settings of the gesture. these are added to the instance settings,
+ * and can be overruled per instance. you can also add the name of the gesture,
+ * but this is also added by default (and set to true).
+ *
+ * @param   {Function}  handler
+ * this handles the gesture detection of your custom gesture and receives the
+ * following arguments:
+ *
+ *      @param  {Object}    eventData
+ *      event data containing the following properties:
+ *          timeStamp   {Number}        time the event occurred
+ *          target      {HTMLElement}   target element
+ *          touches     {Array}         touches (fingers, pointers, mouse) on the screen
+ *          pointerType {String}        kind of pointer that was used. matches Hammer.POINTER_MOUSE|TOUCH
+ *          center      {Object}        center position of the touches. contains pageX and pageY
+ *          deltaTime   {Number}        the total time of the touches in the screen
+ *          deltaX      {Number}        the delta on x axis we haved moved
+ *          deltaY      {Number}        the delta on y axis we haved moved
+ *          velocityX   {Number}        the velocity on the x
+ *          velocityY   {Number}        the velocity on y
+ *          angle       {Number}        the angle we are moving
+ *          direction   {String}        the direction we are moving. matches Hammer.DIRECTION_UP|DOWN|LEFT|RIGHT
+ *          distance    {Number}        the distance we haved moved
+ *          scale       {Number}        scaling of the touches, needs 2 touches
+ *          rotation    {Number}        rotation of the touches, needs 2 touches *
+ *          eventType   {String}        matches Hammer.EVENT_START|MOVE|END
+ *          srcEvent    {Object}        the source event, like TouchStart or MouseDown *
+ *          startEvent  {Object}        contains the same properties as above,
+ *                                      but from the first touch. this is used to calculate
+ *                                      distances, deltaTime, scaling etc
+ *
+ *      @param  {Hammer.Instance}    inst
+ *      the instance we are doing the detection for. you can get the options from
+ *      the inst.options object and trigger the gesture event by calling inst.trigger
+ *
+ *
+ * Handle gestures
+ * --------------------
+ * inside the handler you can get/set Hammer.detection.current. This is the current
+ * detection session. It has the following properties
+ *      @param  {String}    name
+ *      contains the name of the gesture we have detected. it has not a real function,
+ *      only to check in other gestures if something is detected.
+ *      like in the drag gesture we set it to 'drag' and in the swipe gesture we can
+ *      check if the current gesture is 'drag' by accessing Hammer.detection.current.name
+ *
+ *      @readonly
+ *      @param  {Hammer.Instance}    inst
+ *      the instance we do the detection for
+ *
+ *      @readonly
+ *      @param  {Object}    startEvent
+ *      contains the properties of the first gesture detection in this session.
+ *      Used for calculations about timing, distance, etc.
+ *
+ *      @readonly
+ *      @param  {Object}    lastEvent
+ *      contains all the properties of the last gesture detect in this session.
+ *
+ * after the gesture detection session has been completed (user has released the screen)
+ * the Hammer.detection.current object is copied into Hammer.detection.previous,
+ * this is usefull for gestures like doubletap, where you need to know if the
+ * previous gesture was a tap
+ *
+ * options that have been set by the instance can be received by calling inst.options
+ *
+ * You can trigger a gesture event by calling inst.trigger("mygesture", event).
+ * The first param is the name of your gesture, the second the event argument
+ *
+ *
+ * Register gestures
+ * --------------------
+ * When an gesture is added to the Hammer.gestures object, it is auto registered
+ * at the setup of the first Hammer instance. You can also call Hammer.detection.register
+ * manually and pass your gesture object as a param
+ *
+ */
+
+/**
+ * Hold
+ * Touch stays at the same place for x time
+ * @events  hold
+ */
+Hammer.gestures.Hold = {
+    name: 'hold',
+    index: 10,
+    defaults: {
+        hold_timeout	: 500,
+        hold_threshold	: 1
+    },
+    timer: null,
+    handler: function holdGesture(ev, inst) {
+        switch(ev.eventType) {
+            case Hammer.EVENT_START:
+                // clear any running timers
+                clearTimeout(this.timer);
+
+                // set the gesture so we can check in the timeout if it still is
+                Hammer.detection.current.name = this.name;
+
+                // set timer and if after the timeout it still is hold,
+                // we trigger the hold event
+                this.timer = setTimeout(function() {
+                    if(Hammer.detection.current.name == 'hold') {
+                        inst.trigger('hold', ev);
+                    }
+                }, inst.options.hold_timeout);
+                break;
+
+            // when you move or end we clear the timer
+            case Hammer.EVENT_MOVE:
+                if(ev.distance > inst.options.hold_threshold) {
+                    clearTimeout(this.timer);
+                }
+                break;
+
+            case Hammer.EVENT_END:
+                clearTimeout(this.timer);
+                break;
+        }
+    }
+};
+
+
+/**
+ * Tap/DoubleTap
+ * Quick touch at a place or double at the same place
+ * @events  tap, doubletap
+ */
+Hammer.gestures.Tap = {
+    name: 'tap',
+    index: 100,
+    defaults: {
+        tap_max_touchtime	: 250,
+        tap_max_distance	: 10,
+		tap_always			: true,
+        doubletap_distance	: 20,
+        doubletap_interval	: 300
+    },
+    handler: function tapGesture(ev, inst) {
+        if(ev.eventType == Hammer.EVENT_END) {
+            // previous gesture, for the double tap since these are two different gesture detections
+            var prev = Hammer.detection.previous,
+				did_doubletap = false;
+
+            // when the touchtime is higher then the max touch time
+            // or when the moving distance is too much
+            if(ev.deltaTime > inst.options.tap_max_touchtime ||
+                ev.distance > inst.options.tap_max_distance) {
+                return;
+            }
+
+            // check if double tap
+            if(prev && prev.name == 'tap' &&
+                (ev.timeStamp - prev.lastEvent.timeStamp) < inst.options.doubletap_interval &&
+                ev.distance < inst.options.doubletap_distance) {
+				inst.trigger('doubletap', ev);
+				did_doubletap = true;
+            }
+
+			// do a single tap
+			if(!did_doubletap || inst.options.tap_always) {
+				Hammer.detection.current.name = 'tap';
+				inst.trigger(Hammer.detection.current.name, ev);
+			}
+        }
+    }
+};
+
+
+/**
+ * Swipe
+ * triggers swipe events when the end velocity is above the threshold
+ * @events  swipe, swipeleft, swiperight, swipeup, swipedown
+ */
+Hammer.gestures.Swipe = {
+    name: 'swipe',
+    index: 40,
+    defaults: {
+        // set 0 for unlimited, but this can conflict with transform
+        swipe_max_touches  : 1,
+        swipe_velocity     : 0.7
+    },
+    handler: function swipeGesture(ev, inst) {
+        if(ev.eventType == Hammer.EVENT_END) {
+            // max touches
+            if(inst.options.swipe_max_touches > 0 &&
+                ev.touches.length > inst.options.swipe_max_touches) {
+                return;
+            }
+
+            // when the distance we moved is too small we skip this gesture
+            // or we can be already in dragging
+            if(ev.velocityX > inst.options.swipe_velocity ||
+                ev.velocityY > inst.options.swipe_velocity) {
+                // trigger swipe events
+                inst.trigger(this.name, ev);
+                inst.trigger(this.name + ev.direction, ev);
+            }
+        }
+    }
+};
+
+
+/**
+ * Drag
+ * Move with x fingers (default 1) around on the page. Blocking the scrolling when
+ * moving left and right is a good practice. When all the drag events are blocking
+ * you disable scrolling on that area.
+ * @events  drag, drapleft, dragright, dragup, dragdown
+ */
+Hammer.gestures.Drag = {
+    name: 'drag',
+    index: 50,
+    defaults: {
+        drag_min_distance : 10,
+        // set 0 for unlimited, but this can conflict with transform
+        drag_max_touches  : 1,
+        // prevent default browser behavior when dragging occurs
+        // be careful with it, it makes the element a blocking element
+        // when you are using the drag gesture, it is a good practice to set this true
+        drag_block_horizontal   : false,
+        drag_block_vertical     : false,
+        // drag_lock_to_axis keeps the drag gesture on the axis that it started on,
+        // It disallows vertical directions if the initial direction was horizontal, and vice versa.
+        drag_lock_to_axis       : false,
+        // drag lock only kicks in when distance > drag_lock_min_distance
+        // This way, locking occurs only when the distance has become large enough to reliably determine the direction
+        drag_lock_min_distance : 25
+    },
+    triggered: false,
+    handler: function dragGesture(ev, inst) {
+        // current gesture isnt drag, but dragged is true
+        // this means an other gesture is busy. now call dragend
+        if(Hammer.detection.current.name != this.name && this.triggered) {
+            inst.trigger(this.name +'end', ev);
+            this.triggered = false;
+            return;
+        }
+
+        // max touches
+        if(inst.options.drag_max_touches > 0 &&
+            ev.touches.length > inst.options.drag_max_touches) {
+            return;
+        }
+
+        switch(ev.eventType) {
+            case Hammer.EVENT_START:
+                this.triggered = false;
+                break;
+
+            case Hammer.EVENT_MOVE:
+                // when the distance we moved is too small we skip this gesture
+                // or we can be already in dragging
+                if(ev.distance < inst.options.drag_min_distance &&
+                    Hammer.detection.current.name != this.name) {
+                    return;
+                }
+
+                // we are dragging!
+                Hammer.detection.current.name = this.name;
+
+                // lock drag to axis?
+                if(Hammer.detection.current.lastEvent.drag_locked_to_axis || (inst.options.drag_lock_to_axis && inst.options.drag_lock_min_distance<=ev.distance)) {
+                    ev.drag_locked_to_axis = true;
+                }
+                var last_direction = Hammer.detection.current.lastEvent.direction;
+                if(ev.drag_locked_to_axis && last_direction !== ev.direction) {
+                    // keep direction on the axis that the drag gesture started on
+                    if(Hammer.utils.isVertical(last_direction)) {
+                        ev.direction = (ev.deltaY < 0) ? Hammer.DIRECTION_UP : Hammer.DIRECTION_DOWN;
+                    }
+                    else {
+                        ev.direction = (ev.deltaX < 0) ? Hammer.DIRECTION_LEFT : Hammer.DIRECTION_RIGHT;
+                    }
+                }
+
+                // first time, trigger dragstart event
+                if(!this.triggered) {
+                    inst.trigger(this.name +'start', ev);
+                    this.triggered = true;
+                }
+
+                // trigger normal event
+                inst.trigger(this.name, ev);
+
+                // direction event, like dragdown
+                inst.trigger(this.name + ev.direction, ev);
+
+                // block the browser events
+                if( (inst.options.drag_block_vertical && Hammer.utils.isVertical(ev.direction)) ||
+                    (inst.options.drag_block_horizontal && !Hammer.utils.isVertical(ev.direction))) {
+                    ev.preventDefault();
+                }
+                break;
+
+            case Hammer.EVENT_END:
+                // trigger dragend
+                if(this.triggered) {
+                    inst.trigger(this.name +'end', ev);
+                }
+
+                this.triggered = false;
+                break;
+        }
+    }
+};
+
+
+/**
+ * Transform
+ * User want to scale or rotate with 2 fingers
+ * @events  transform, pinch, pinchin, pinchout, rotate
+ */
+Hammer.gestures.Transform = {
+    name: 'transform',
+    index: 45,
+    defaults: {
+        // factor, no scale is 1, zoomin is to 0 and zoomout until higher then 1
+        transform_min_scale     : 0.01,
+        // rotation in degrees
+        transform_min_rotation  : 1,
+        // prevent default browser behavior when two touches are on the screen
+        // but it makes the element a blocking element
+        // when you are using the transform gesture, it is a good practice to set this true
+        transform_always_block  : false
+    },
+    triggered: false,
+    handler: function transformGesture(ev, inst) {
+        // current gesture isnt drag, but dragged is true
+        // this means an other gesture is busy. now call dragend
+        if(Hammer.detection.current.name != this.name && this.triggered) {
+            inst.trigger(this.name +'end', ev);
+            this.triggered = false;
+            return;
+        }
+
+        // atleast multitouch
+        if(ev.touches.length < 2) {
+            return;
+        }
+
+        // prevent default when two fingers are on the screen
+        if(inst.options.transform_always_block) {
+            ev.preventDefault();
+        }
+
+        switch(ev.eventType) {
+            case Hammer.EVENT_START:
+                this.triggered = false;
+                break;
+
+            case Hammer.EVENT_MOVE:
+                var scale_threshold = Math.abs(1-ev.scale);
+                var rotation_threshold = Math.abs(ev.rotation);
+
+                // when the distance we moved is too small we skip this gesture
+                // or we can be already in dragging
+                if(scale_threshold < inst.options.transform_min_scale &&
+                    rotation_threshold < inst.options.transform_min_rotation) {
+                    return;
+                }
+
+                // we are transforming!
+                Hammer.detection.current.name = this.name;
+
+                // first time, trigger dragstart event
+                if(!this.triggered) {
+                    inst.trigger(this.name +'start', ev);
+                    this.triggered = true;
+                }
+
+                inst.trigger(this.name, ev); // basic transform event
+
+                // trigger rotate event
+                if(rotation_threshold > inst.options.transform_min_rotation) {
+                    inst.trigger('rotate', ev);
+                }
+
+                // trigger pinch event
+                if(scale_threshold > inst.options.transform_min_scale) {
+                    inst.trigger('pinch', ev);
+                    inst.trigger('pinch'+ ((ev.scale < 1) ? 'in' : 'out'), ev);
+                }
+                break;
+
+            case Hammer.EVENT_END:
+                // trigger dragend
+                if(this.triggered) {
+                    inst.trigger(this.name +'end', ev);
+                }
+
+                this.triggered = false;
+                break;
+        }
+    }
+};
+
+
+/**
+ * Touch
+ * Called as first, tells the user has touched the screen
+ * @events  touch
+ */
+Hammer.gestures.Touch = {
+    name: 'touch',
+    index: -Infinity,
+    defaults: {
+        // call preventDefault at touchstart, and makes the element blocking by
+        // disabling the scrolling of the page, but it improves gestures like
+        // transforming and dragging.
+        // be careful with using this, it can be very annoying for users to be stuck
+        // on the page
+        prevent_default: false,
+
+        // disable mouse events, so only touch (or pen!) input triggers events
+        prevent_mouseevents: false
+    },
+    handler: function touchGesture(ev, inst) {
+        if(inst.options.prevent_mouseevents && ev.pointerType == Hammer.POINTER_MOUSE) {
+            ev.stopDetect();
+            return;
+        }
+
+        if(inst.options.prevent_default) {
+            ev.preventDefault();
+        }
+
+        if(ev.eventType ==  Hammer.EVENT_START) {
+            inst.trigger(this.name, ev);
+        }
+    }
+};
+
+
+/**
+ * Release
+ * Called as last, tells the user has released the screen
+ * @events  release
+ */
+Hammer.gestures.Release = {
+    name: 'release',
+    index: Infinity,
+    handler: function releaseGesture(ev, inst) {
+        if(ev.eventType ==  Hammer.EVENT_END) {
+            inst.trigger(this.name, ev);
+        }
+    }
+};
+
+// node export
+if(typeof module === 'object' && typeof module.exports === 'object'){
+    module.exports = Hammer;
+}
+// just window export
+else {
+    window.Hammer = Hammer;
+
+    // requireJS module definition
+    if(typeof window.define === 'function' && window.define.amd) {
+        window.define('hammer', [], function() {
+            return Hammer;
+        });
+    }
+}
+})(this);
+},{}],3:[function(require,module,exports){
+//! moment.js
+//! version : 2.5.0
+//! authors : Tim Wood, Iskren Chernev, Moment.js contributors
+//! license : MIT
+//! momentjs.com
+
+(function (undefined) {
+
+    /************************************
+        Constants
+    ************************************/
+
+    var moment,
+        VERSION = "2.5.0",
+        global = this,
+        round = Math.round,
+        i,
+
+        YEAR = 0,
+        MONTH = 1,
+        DATE = 2,
+        HOUR = 3,
+        MINUTE = 4,
+        SECOND = 5,
+        MILLISECOND = 6,
+
+        // internal storage for language config files
+        languages = {},
+
+        // check for nodeJS
+        hasModule = (typeof module !== 'undefined' && module.exports && typeof require !== 'undefined'),
+
+        // ASP.NET json date format regex
+        aspNetJsonRegex = /^\/?Date\((\-?\d+)/i,
+        aspNetTimeSpanJsonRegex = /(\-)?(?:(\d*)\.)?(\d+)\:(\d+)(?:\:(\d+)\.?(\d{3})?)?/,
+
+        // from http://docs.closure-library.googlecode.com/git/closure_goog_date_date.js.source.html
+        // somewhat more in line with 4.4.3.2 2004 spec, but allows decimal anywhere
+        isoDurationRegex = /^(-)?P(?:(?:([0-9,.]*)Y)?(?:([0-9,.]*)M)?(?:([0-9,.]*)D)?(?:T(?:([0-9,.]*)H)?(?:([0-9,.]*)M)?(?:([0-9,.]*)S)?)?|([0-9,.]*)W)$/,
+
+        // format tokens
+        formattingTokens = /(\[[^\[]*\])|(\\)?(Mo|MM?M?M?|Do|DDDo|DD?D?D?|ddd?d?|do?|w[o|w]?|W[o|W]?|YYYYYY|YYYYY|YYYY|YY|gg(ggg?)?|GG(GGG?)?|e|E|a|A|hh?|HH?|mm?|ss?|S{1,4}|X|zz?|ZZ?|.)/g,
+        localFormattingTokens = /(\[[^\[]*\])|(\\)?(LT|LL?L?L?|l{1,4})/g,
+
+        // parsing token regexes
+        parseTokenOneOrTwoDigits = /\d\d?/, // 0 - 99
+        parseTokenOneToThreeDigits = /\d{1,3}/, // 0 - 999
+        parseTokenOneToFourDigits = /\d{1,4}/, // 0 - 9999
+        parseTokenOneToSixDigits = /[+\-]?\d{1,6}/, // -999,999 - 999,999
+        parseTokenDigits = /\d+/, // nonzero number of digits
+        parseTokenWord = /[0-9]*['a-z\u00A0-\u05FF\u0700-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF]+|[\u0600-\u06FF\/]+(\s*?[\u0600-\u06FF]+){1,2}/i, // any word (or two) characters or numbers including two/three word month in arabic.
+        parseTokenTimezone = /Z|[\+\-]\d\d:?\d\d/gi, // +00:00 -00:00 +0000 -0000 or Z
+        parseTokenT = /T/i, // T (ISO separator)
+        parseTokenTimestampMs = /[\+\-]?\d+(\.\d{1,3})?/, // 123456789 123456789.123
+
+        //strict parsing regexes
+        parseTokenOneDigit = /\d/, // 0 - 9
+        parseTokenTwoDigits = /\d\d/, // 00 - 99
+        parseTokenThreeDigits = /\d{3}/, // 000 - 999
+        parseTokenFourDigits = /\d{4}/, // 0000 - 9999
+        parseTokenSixDigits = /[+\-]?\d{6}/, // -999,999 - 999,999
+
+        // iso 8601 regex
+        // 0000-00-00 0000-W00 or 0000-W00-0 + T + 00 or 00:00 or 00:00:00 or 00:00:00.000 + +00:00 or +0000 or +00)
+        isoRegex = /^\s*\d{4}-(?:(\d\d-\d\d)|(W\d\d$)|(W\d\d-\d)|(\d\d\d))((T| )(\d\d(:\d\d(:\d\d(\.\d+)?)?)?)?([\+\-]\d\d(?::?\d\d)?|\s*Z)?)?$/,
+
+        isoFormat = 'YYYY-MM-DDTHH:mm:ssZ',
+
+        isoDates = [
+            'YYYY-MM-DD',
+            'GGGG-[W]WW',
+            'GGGG-[W]WW-E',
+            'YYYY-DDD'
+        ],
+
+        // iso time formats and regexes
+        isoTimes = [
+            ['HH:mm:ss.SSSS', /(T| )\d\d:\d\d:\d\d\.\d{1,3}/],
+            ['HH:mm:ss', /(T| )\d\d:\d\d:\d\d/],
+            ['HH:mm', /(T| )\d\d:\d\d/],
+            ['HH', /(T| )\d\d/]
+        ],
+
+        // timezone chunker "+10:00" > ["10", "00"] or "-1530" > ["-15", "30"]
+        parseTimezoneChunker = /([\+\-]|\d\d)/gi,
+
+        // getter and setter names
+        proxyGettersAndSetters = 'Date|Hours|Minutes|Seconds|Milliseconds'.split('|'),
+        unitMillisecondFactors = {
+            'Milliseconds' : 1,
+            'Seconds' : 1e3,
+            'Minutes' : 6e4,
+            'Hours' : 36e5,
+            'Days' : 864e5,
+            'Months' : 2592e6,
+            'Years' : 31536e6
+        },
+
+        unitAliases = {
+            ms : 'millisecond',
+            s : 'second',
+            m : 'minute',
+            h : 'hour',
+            d : 'day',
+            D : 'date',
+            w : 'week',
+            W : 'isoWeek',
+            M : 'month',
+            y : 'year',
+            DDD : 'dayOfYear',
+            e : 'weekday',
+            E : 'isoWeekday',
+            gg: 'weekYear',
+            GG: 'isoWeekYear'
+        },
+
+        camelFunctions = {
+            dayofyear : 'dayOfYear',
+            isoweekday : 'isoWeekday',
+            isoweek : 'isoWeek',
+            weekyear : 'weekYear',
+            isoweekyear : 'isoWeekYear'
+        },
+
+        // format function strings
+        formatFunctions = {},
+
+        // tokens to ordinalize and pad
+        ordinalizeTokens = 'DDD w W M D d'.split(' '),
+        paddedTokens = 'M D H h m s w W'.split(' '),
+
+        formatTokenFunctions = {
+            M    : function () {
+                return this.month() + 1;
+            },
+            MMM  : function (format) {
+                return this.lang().monthsShort(this, format);
+            },
+            MMMM : function (format) {
+                return this.lang().months(this, format);
+            },
+            D    : function () {
+                return this.date();
+            },
+            DDD  : function () {
+                return this.dayOfYear();
+            },
+            d    : function () {
+                return this.day();
+            },
+            dd   : function (format) {
+                return this.lang().weekdaysMin(this, format);
+            },
+            ddd  : function (format) {
+                return this.lang().weekdaysShort(this, format);
+            },
+            dddd : function (format) {
+                return this.lang().weekdays(this, format);
+            },
+            w    : function () {
+                return this.week();
+            },
+            W    : function () {
+                return this.isoWeek();
+            },
+            YY   : function () {
+                return leftZeroFill(this.year() % 100, 2);
+            },
+            YYYY : function () {
+                return leftZeroFill(this.year(), 4);
+            },
+            YYYYY : function () {
+                return leftZeroFill(this.year(), 5);
+            },
+            YYYYYY : function () {
+                var y = this.year(), sign = y >= 0 ? '+' : '-';
+                return sign + leftZeroFill(Math.abs(y), 6);
+            },
+            gg   : function () {
+                return leftZeroFill(this.weekYear() % 100, 2);
+            },
+            gggg : function () {
+                return this.weekYear();
+            },
+            ggggg : function () {
+                return leftZeroFill(this.weekYear(), 5);
+            },
+            GG   : function () {
+                return leftZeroFill(this.isoWeekYear() % 100, 2);
+            },
+            GGGG : function () {
+                return this.isoWeekYear();
+            },
+            GGGGG : function () {
+                return leftZeroFill(this.isoWeekYear(), 5);
+            },
+            e : function () {
+                return this.weekday();
+            },
+            E : function () {
+                return this.isoWeekday();
+            },
+            a    : function () {
+                return this.lang().meridiem(this.hours(), this.minutes(), true);
+            },
+            A    : function () {
+                return this.lang().meridiem(this.hours(), this.minutes(), false);
+            },
+            H    : function () {
+                return this.hours();
+            },
+            h    : function () {
+                return this.hours() % 12 || 12;
+            },
+            m    : function () {
+                return this.minutes();
+            },
+            s    : function () {
+                return this.seconds();
+            },
+            S    : function () {
+                return toInt(this.milliseconds() / 100);
+            },
+            SS   : function () {
+                return leftZeroFill(toInt(this.milliseconds() / 10), 2);
+            },
+            SSS  : function () {
+                return leftZeroFill(this.milliseconds(), 3);
+            },
+            SSSS : function () {
+                return leftZeroFill(this.milliseconds(), 3);
+            },
+            Z    : function () {
+                var a = -this.zone(),
+                    b = "+";
+                if (a < 0) {
+                    a = -a;
+                    b = "-";
+                }
+                return b + leftZeroFill(toInt(a / 60), 2) + ":" + leftZeroFill(toInt(a) % 60, 2);
+            },
+            ZZ   : function () {
+                var a = -this.zone(),
+                    b = "+";
+                if (a < 0) {
+                    a = -a;
+                    b = "-";
+                }
+                return b + leftZeroFill(toInt(a / 60), 2) + leftZeroFill(toInt(a) % 60, 2);
+            },
+            z : function () {
+                return this.zoneAbbr();
+            },
+            zz : function () {
+                return this.zoneName();
+            },
+            X    : function () {
+                return this.unix();
+            },
+            Q : function () {
+                return this.quarter();
+            }
+        },
+
+        lists = ['months', 'monthsShort', 'weekdays', 'weekdaysShort', 'weekdaysMin'];
+
+    function padToken(func, count) {
+        return function (a) {
+            return leftZeroFill(func.call(this, a), count);
+        };
+    }
+    function ordinalizeToken(func, period) {
+        return function (a) {
+            return this.lang().ordinal(func.call(this, a), period);
+        };
+    }
+
+    while (ordinalizeTokens.length) {
+        i = ordinalizeTokens.pop();
+        formatTokenFunctions[i + 'o'] = ordinalizeToken(formatTokenFunctions[i], i);
+    }
+    while (paddedTokens.length) {
+        i = paddedTokens.pop();
+        formatTokenFunctions[i + i] = padToken(formatTokenFunctions[i], 2);
+    }
+    formatTokenFunctions.DDDD = padToken(formatTokenFunctions.DDD, 3);
+
+
+    /************************************
+        Constructors
+    ************************************/
+
+    function Language() {
+
+    }
+
+    // Moment prototype object
+    function Moment(config) {
+        checkOverflow(config);
+        extend(this, config);
+    }
+
+    // Duration Constructor
+    function Duration(duration) {
+        var normalizedInput = normalizeObjectUnits(duration),
+            years = normalizedInput.year || 0,
+            months = normalizedInput.month || 0,
+            weeks = normalizedInput.week || 0,
+            days = normalizedInput.day || 0,
+            hours = normalizedInput.hour || 0,
+            minutes = normalizedInput.minute || 0,
+            seconds = normalizedInput.second || 0,
+            milliseconds = normalizedInput.millisecond || 0;
+
+        // representation for dateAddRemove
+        this._milliseconds = +milliseconds +
+            seconds * 1e3 + // 1000
+            minutes * 6e4 + // 1000 * 60
+            hours * 36e5; // 1000 * 60 * 60
+        // Because of dateAddRemove treats 24 hours as different from a
+        // day when working around DST, we need to store them separately
+        this._days = +days +
+            weeks * 7;
+        // It is impossible translate months into days without knowing
+        // which months you are are talking about, so we have to store
+        // it separately.
+        this._months = +months +
+            years * 12;
+
+        this._data = {};
+
+        this._bubble();
+    }
+
+    /************************************
+        Helpers
+    ************************************/
+
+
+    function extend(a, b) {
+        for (var i in b) {
+            if (b.hasOwnProperty(i)) {
+                a[i] = b[i];
+            }
+        }
+
+        if (b.hasOwnProperty("toString")) {
+            a.toString = b.toString;
+        }
+
+        if (b.hasOwnProperty("valueOf")) {
+            a.valueOf = b.valueOf;
+        }
+
+        return a;
+    }
+
+    function absRound(number) {
+        if (number < 0) {
+            return Math.ceil(number);
+        } else {
+            return Math.floor(number);
+        }
+    }
+
+    // left zero fill a number
+    // see http://jsperf.com/left-zero-filling for performance comparison
+    function leftZeroFill(number, targetLength, forceSign) {
+        var output = Math.abs(number) + '',
+            sign = number >= 0;
+
+        while (output.length < targetLength) {
+            output = '0' + output;
+        }
+        return (sign ? (forceSign ? '+' : '') : '-') + output;
+    }
+
+    // helper function for _.addTime and _.subtractTime
+    function addOrSubtractDurationFromMoment(mom, duration, isAdding, ignoreUpdateOffset) {
+        var milliseconds = duration._milliseconds,
+            days = duration._days,
+            months = duration._months,
+            minutes,
+            hours;
+
+        if (milliseconds) {
+            mom._d.setTime(+mom._d + milliseconds * isAdding);
+        }
+        // store the minutes and hours so we can restore them
+        if (days || months) {
+            minutes = mom.minute();
+            hours = mom.hour();
+        }
+        if (days) {
+            mom.date(mom.date() + days * isAdding);
+        }
+        if (months) {
+            mom.month(mom.month() + months * isAdding);
+        }
+        if (milliseconds && !ignoreUpdateOffset) {
+            moment.updateOffset(mom);
+        }
+        // restore the minutes and hours after possibly changing dst
+        if (days || months) {
+            mom.minute(minutes);
+            mom.hour(hours);
+        }
+    }
+
+    // check if is an array
+    function isArray(input) {
+        return Object.prototype.toString.call(input) === '[object Array]';
+    }
+
+    function isDate(input) {
+        return  Object.prototype.toString.call(input) === '[object Date]' ||
+                input instanceof Date;
+    }
+
+    // compare two arrays, return the number of differences
+    function compareArrays(array1, array2, dontConvert) {
+        var len = Math.min(array1.length, array2.length),
+            lengthDiff = Math.abs(array1.length - array2.length),
+            diffs = 0,
+            i;
+        for (i = 0; i < len; i++) {
+            if ((dontConvert && array1[i] !== array2[i]) ||
+                (!dontConvert && toInt(array1[i]) !== toInt(array2[i]))) {
+                diffs++;
+            }
+        }
+        return diffs + lengthDiff;
+    }
+
+    function normalizeUnits(units) {
+        if (units) {
+            var lowered = units.toLowerCase().replace(/(.)s$/, '$1');
+            units = unitAliases[units] || camelFunctions[lowered] || lowered;
+        }
+        return units;
+    }
+
+    function normalizeObjectUnits(inputObject) {
+        var normalizedInput = {},
+            normalizedProp,
+            prop;
+
+        for (prop in inputObject) {
+            if (inputObject.hasOwnProperty(prop)) {
+                normalizedProp = normalizeUnits(prop);
+                if (normalizedProp) {
+                    normalizedInput[normalizedProp] = inputObject[prop];
+                }
+            }
+        }
+
+        return normalizedInput;
+    }
+
+    function makeList(field) {
+        var count, setter;
+
+        if (field.indexOf('week') === 0) {
+            count = 7;
+            setter = 'day';
+        }
+        else if (field.indexOf('month') === 0) {
+            count = 12;
+            setter = 'month';
+        }
+        else {
+            return;
+        }
+
+        moment[field] = function (format, index) {
+            var i, getter,
+                method = moment.fn._lang[field],
+                results = [];
+
+            if (typeof format === 'number') {
+                index = format;
+                format = undefined;
+            }
+
+            getter = function (i) {
+                var m = moment().utc().set(setter, i);
+                return method.call(moment.fn._lang, m, format || '');
+            };
+
+            if (index != null) {
+                return getter(index);
+            }
+            else {
+                for (i = 0; i < count; i++) {
+                    results.push(getter(i));
+                }
+                return results;
+            }
+        };
+    }
+
+    function toInt(argumentForCoercion) {
+        var coercedNumber = +argumentForCoercion,
+            value = 0;
+
+        if (coercedNumber !== 0 && isFinite(coercedNumber)) {
+            if (coercedNumber >= 0) {
+                value = Math.floor(coercedNumber);
+            } else {
+                value = Math.ceil(coercedNumber);
+            }
+        }
+
+        return value;
+    }
+
+    function daysInMonth(year, month) {
+        return new Date(Date.UTC(year, month + 1, 0)).getUTCDate();
+    }
+
+    function daysInYear(year) {
+        return isLeapYear(year) ? 366 : 365;
+    }
+
+    function isLeapYear(year) {
+        return (year % 4 === 0 && year % 100 !== 0) || year % 400 === 0;
+    }
+
+    function checkOverflow(m) {
+        var overflow;
+        if (m._a && m._pf.overflow === -2) {
+            overflow =
+                m._a[MONTH] < 0 || m._a[MONTH] > 11 ? MONTH :
+                m._a[DATE] < 1 || m._a[DATE] > daysInMonth(m._a[YEAR], m._a[MONTH]) ? DATE :
+                m._a[HOUR] < 0 || m._a[HOUR] > 23 ? HOUR :
+                m._a[MINUTE] < 0 || m._a[MINUTE] > 59 ? MINUTE :
+                m._a[SECOND] < 0 || m._a[SECOND] > 59 ? SECOND :
+                m._a[MILLISECOND] < 0 || m._a[MILLISECOND] > 999 ? MILLISECOND :
+                -1;
+
+            if (m._pf._overflowDayOfYear && (overflow < YEAR || overflow > DATE)) {
+                overflow = DATE;
+            }
+
+            m._pf.overflow = overflow;
+        }
+    }
+
+    function initializeParsingFlags(config) {
+        config._pf = {
+            empty : false,
+            unusedTokens : [],
+            unusedInput : [],
+            overflow : -2,
+            charsLeftOver : 0,
+            nullInput : false,
+            invalidMonth : null,
+            invalidFormat : false,
+            userInvalidated : false,
+            iso: false
+        };
+    }
+
+    function isValid(m) {
+        if (m._isValid == null) {
+            m._isValid = !isNaN(m._d.getTime()) &&
+                m._pf.overflow < 0 &&
+                !m._pf.empty &&
+                !m._pf.invalidMonth &&
+                !m._pf.nullInput &&
+                !m._pf.invalidFormat &&
+                !m._pf.userInvalidated;
+
+            if (m._strict) {
+                m._isValid = m._isValid &&
+                    m._pf.charsLeftOver === 0 &&
+                    m._pf.unusedTokens.length === 0;
+            }
+        }
+        return m._isValid;
+    }
+
+    function normalizeLanguage(key) {
+        return key ? key.toLowerCase().replace('_', '-') : key;
+    }
+
+    // Return a moment from input, that is local/utc/zone equivalent to model.
+    function makeAs(input, model) {
+        return model._isUTC ? moment(input).zone(model._offset || 0) :
+            moment(input).local();
+    }
+
+    /************************************
+        Languages
+    ************************************/
+
+
+    extend(Language.prototype, {
+
+        set : function (config) {
+            var prop, i;
+            for (i in config) {
+                prop = config[i];
+                if (typeof prop === 'function') {
+                    this[i] = prop;
+                } else {
+                    this['_' + i] = prop;
+                }
+            }
+        },
+
+        _months : "January_February_March_April_May_June_July_August_September_October_November_December".split("_"),
+        months : function (m) {
+            return this._months[m.month()];
+        },
+
+        _monthsShort : "Jan_Feb_Mar_Apr_May_Jun_Jul_Aug_Sep_Oct_Nov_Dec".split("_"),
+        monthsShort : function (m) {
+            return this._monthsShort[m.month()];
+        },
+
+        monthsParse : function (monthName) {
+            var i, mom, regex;
+
+            if (!this._monthsParse) {
+                this._monthsParse = [];
+            }
+
+            for (i = 0; i < 12; i++) {
+                // make the regex if we don't have it already
+                if (!this._monthsParse[i]) {
+                    mom = moment.utc([2000, i]);
+                    regex = '^' + this.months(mom, '') + '|^' + this.monthsShort(mom, '');
+                    this._monthsParse[i] = new RegExp(regex.replace('.', ''), 'i');
+                }
+                // test the regex
+                if (this._monthsParse[i].test(monthName)) {
+                    return i;
+                }
+            }
+        },
+
+        _weekdays : "Sunday_Monday_Tuesday_Wednesday_Thursday_Friday_Saturday".split("_"),
+        weekdays : function (m) {
+            return this._weekdays[m.day()];
+        },
+
+        _weekdaysShort : "Sun_Mon_Tue_Wed_Thu_Fri_Sat".split("_"),
+        weekdaysShort : function (m) {
+            return this._weekdaysShort[m.day()];
+        },
+
+        _weekdaysMin : "Su_Mo_Tu_We_Th_Fr_Sa".split("_"),
+        weekdaysMin : function (m) {
+            return this._weekdaysMin[m.day()];
+        },
+
+        weekdaysParse : function (weekdayName) {
+            var i, mom, regex;
+
+            if (!this._weekdaysParse) {
+                this._weekdaysParse = [];
+            }
+
+            for (i = 0; i < 7; i++) {
+                // make the regex if we don't have it already
+                if (!this._weekdaysParse[i]) {
+                    mom = moment([2000, 1]).day(i);
+                    regex = '^' + this.weekdays(mom, '') + '|^' + this.weekdaysShort(mom, '') + '|^' + this.weekdaysMin(mom, '');
+                    this._weekdaysParse[i] = new RegExp(regex.replace('.', ''), 'i');
+                }
+                // test the regex
+                if (this._weekdaysParse[i].test(weekdayName)) {
+                    return i;
+                }
+            }
+        },
+
+        _longDateFormat : {
+            LT : "h:mm A",
+            L : "MM/DD/YYYY",
+            LL : "MMMM D YYYY",
+            LLL : "MMMM D YYYY LT",
+            LLLL : "dddd, MMMM D YYYY LT"
+        },
+        longDateFormat : function (key) {
+            var output = this._longDateFormat[key];
+            if (!output && this._longDateFormat[key.toUpperCase()]) {
+                output = this._longDateFormat[key.toUpperCase()].replace(/MMMM|MM|DD|dddd/g, function (val) {
+                    return val.slice(1);
+                });
+                this._longDateFormat[key] = output;
+            }
+            return output;
+        },
+
+        isPM : function (input) {
+            // IE8 Quirks Mode & IE7 Standards Mode do not allow accessing strings like arrays
+            // Using charAt should be more compatible.
+            return ((input + '').toLowerCase().charAt(0) === 'p');
+        },
+
+        _meridiemParse : /[ap]\.?m?\.?/i,
+        meridiem : function (hours, minutes, isLower) {
+            if (hours > 11) {
+                return isLower ? 'pm' : 'PM';
+            } else {
+                return isLower ? 'am' : 'AM';
+            }
+        },
+
+        _calendar : {
+            sameDay : '[Today at] LT',
+            nextDay : '[Tomorrow at] LT',
+            nextWeek : 'dddd [at] LT',
+            lastDay : '[Yesterday at] LT',
+            lastWeek : '[Last] dddd [at] LT',
+            sameElse : 'L'
+        },
+        calendar : function (key, mom) {
+            var output = this._calendar[key];
+            return typeof output === 'function' ? output.apply(mom) : output;
+        },
+
+        _relativeTime : {
+            future : "in %s",
+            past : "%s ago",
+            s : "a few seconds",
+            m : "a minute",
+            mm : "%d minutes",
+            h : "an hour",
+            hh : "%d hours",
+            d : "a day",
+            dd : "%d days",
+            M : "a month",
+            MM : "%d months",
+            y : "a year",
+            yy : "%d years"
+        },
+        relativeTime : function (number, withoutSuffix, string, isFuture) {
+            var output = this._relativeTime[string];
+            return (typeof output === 'function') ?
+                output(number, withoutSuffix, string, isFuture) :
+                output.replace(/%d/i, number);
+        },
+        pastFuture : function (diff, output) {
+            var format = this._relativeTime[diff > 0 ? 'future' : 'past'];
+            return typeof format === 'function' ? format(output) : format.replace(/%s/i, output);
+        },
+
+        ordinal : function (number) {
+            return this._ordinal.replace("%d", number);
+        },
+        _ordinal : "%d",
+
+        preparse : function (string) {
+            return string;
+        },
+
+        postformat : function (string) {
+            return string;
+        },
+
+        week : function (mom) {
+            return weekOfYear(mom, this._week.dow, this._week.doy).week;
+        },
+
+        _week : {
+            dow : 0, // Sunday is the first day of the week.
+            doy : 6  // The week that contains Jan 1st is the first week of the year.
+        },
+
+        _invalidDate: 'Invalid date',
+        invalidDate: function () {
+            return this._invalidDate;
+        }
+    });
+
+    // Loads a language definition into the `languages` cache.  The function
+    // takes a key and optionally values.  If not in the browser and no values
+    // are provided, it will load the language file module.  As a convenience,
+    // this function also returns the language values.
+    function loadLang(key, values) {
+        values.abbr = key;
+        if (!languages[key]) {
+            languages[key] = new Language();
+        }
+        languages[key].set(values);
+        return languages[key];
+    }
+
+    // Remove a language from the `languages` cache. Mostly useful in tests.
+    function unloadLang(key) {
+        delete languages[key];
+    }
+
+    // Determines which language definition to use and returns it.
+    //
+    // With no parameters, it will return the global language.  If you
+    // pass in a language key, such as 'en', it will return the
+    // definition for 'en', so long as 'en' has already been loaded using
+    // moment.lang.
+    function getLangDefinition(key) {
+        var i = 0, j, lang, next, split,
+            get = function (k) {
+                if (!languages[k] && hasModule) {
+                    try {
+                        require('./lang/' + k);
+                    } catch (e) { }
+                }
+                return languages[k];
+            };
+
+        if (!key) {
+            return moment.fn._lang;
+        }
+
+        if (!isArray(key)) {
+            //short-circuit everything else
+            lang = get(key);
+            if (lang) {
+                return lang;
+            }
+            key = [key];
+        }
+
+        //pick the language from the array
+        //try ['en-au', 'en-gb'] as 'en-au', 'en-gb', 'en', as in move through the list trying each
+        //substring from most specific to least, but move to the next array item if it's a more specific variant than the current root
+        while (i < key.length) {
+            split = normalizeLanguage(key[i]).split('-');
+            j = split.length;
+            next = normalizeLanguage(key[i + 1]);
+            next = next ? next.split('-') : null;
+            while (j > 0) {
+                lang = get(split.slice(0, j).join('-'));
+                if (lang) {
+                    return lang;
+                }
+                if (next && next.length >= j && compareArrays(split, next, true) >= j - 1) {
+                    //the next array item is better than a shallower substring of this one
+                    break;
+                }
+                j--;
+            }
+            i++;
+        }
+        return moment.fn._lang;
+    }
+
+    /************************************
+        Formatting
+    ************************************/
+
+
+    function removeFormattingTokens(input) {
+        if (input.match(/\[[\s\S]/)) {
+            return input.replace(/^\[|\]$/g, "");
+        }
+        return input.replace(/\\/g, "");
+    }
+
+    function makeFormatFunction(format) {
+        var array = format.match(formattingTokens), i, length;
+
+        for (i = 0, length = array.length; i < length; i++) {
+            if (formatTokenFunctions[array[i]]) {
+                array[i] = formatTokenFunctions[array[i]];
+            } else {
+                array[i] = removeFormattingTokens(array[i]);
+            }
+        }
+
+        return function (mom) {
+            var output = "";
+            for (i = 0; i < length; i++) {
+                output += array[i] instanceof Function ? array[i].call(mom, format) : array[i];
+            }
+            return output;
+        };
+    }
+
+    // format date using native date object
+    function formatMoment(m, format) {
+
+        if (!m.isValid()) {
+            return m.lang().invalidDate();
+        }
+
+        format = expandFormat(format, m.lang());
+
+        if (!formatFunctions[format]) {
+            formatFunctions[format] = makeFormatFunction(format);
+        }
+
+        return formatFunctions[format](m);
+    }
+
+    function expandFormat(format, lang) {
+        var i = 5;
+
+        function replaceLongDateFormatTokens(input) {
+            return lang.longDateFormat(input) || input;
+        }
+
+        localFormattingTokens.lastIndex = 0;
+        while (i >= 0 && localFormattingTokens.test(format)) {
+            format = format.replace(localFormattingTokens, replaceLongDateFormatTokens);
+            localFormattingTokens.lastIndex = 0;
+            i -= 1;
+        }
+
+        return format;
+    }
+
+
+    /************************************
+        Parsing
+    ************************************/
+
+
+    // get the regex to find the next token
+    function getParseRegexForToken(token, config) {
+        var a, strict = config._strict;
+        switch (token) {
+        case 'DDDD':
+            return parseTokenThreeDigits;
+        case 'YYYY':
+        case 'GGGG':
+        case 'gggg':
+            return strict ? parseTokenFourDigits : parseTokenOneToFourDigits;
+        case 'YYYYYY':
+        case 'YYYYY':
+        case 'GGGGG':
+        case 'ggggg':
+            return strict ? parseTokenSixDigits : parseTokenOneToSixDigits;
+        case 'S':
+            if (strict) { return parseTokenOneDigit; }
+            /* falls through */
+        case 'SS':
+            if (strict) { return parseTokenTwoDigits; }
+            /* falls through */
+        case 'SSS':
+        case 'DDD':
+            return strict ? parseTokenThreeDigits : parseTokenOneToThreeDigits;
+        case 'MMM':
+        case 'MMMM':
+        case 'dd':
+        case 'ddd':
+        case 'dddd':
+            return parseTokenWord;
+        case 'a':
+        case 'A':
+            return getLangDefinition(config._l)._meridiemParse;
+        case 'X':
+            return parseTokenTimestampMs;
+        case 'Z':
+        case 'ZZ':
+            return parseTokenTimezone;
+        case 'T':
+            return parseTokenT;
+        case 'SSSS':
+            return parseTokenDigits;
+        case 'MM':
+        case 'DD':
+        case 'YY':
+        case 'GG':
+        case 'gg':
+        case 'HH':
+        case 'hh':
+        case 'mm':
+        case 'ss':
+        case 'ww':
+        case 'WW':
+            return strict ? parseTokenTwoDigits : parseTokenOneOrTwoDigits;
+        case 'M':
+        case 'D':
+        case 'd':
+        case 'H':
+        case 'h':
+        case 'm':
+        case 's':
+        case 'w':
+        case 'W':
+        case 'e':
+        case 'E':
+            return strict ? parseTokenOneDigit : parseTokenOneOrTwoDigits;
+        default :
+            a = new RegExp(regexpEscape(unescapeFormat(token.replace('\\', '')), "i"));
+            return a;
+        }
+    }
+
+    function timezoneMinutesFromString(string) {
+        string = string || "";
+        var possibleTzMatches = (string.match(parseTokenTimezone) || []),
+            tzChunk = possibleTzMatches[possibleTzMatches.length - 1] || [],
+            parts = (tzChunk + '').match(parseTimezoneChunker) || ['-', 0, 0],
+            minutes = +(parts[1] * 60) + toInt(parts[2]);
+
+        return parts[0] === '+' ? -minutes : minutes;
+    }
+
+    // function to convert string input to date
+    function addTimeToArrayFromToken(token, input, config) {
+        var a, datePartArray = config._a;
+
+        switch (token) {
+        // MONTH
+        case 'M' : // fall through to MM
+        case 'MM' :
+            if (input != null) {
+                datePartArray[MONTH] = toInt(input) - 1;
+            }
+            break;
+        case 'MMM' : // fall through to MMMM
+        case 'MMMM' :
+            a = getLangDefinition(config._l).monthsParse(input);
+            // if we didn't find a month name, mark the date as invalid.
+            if (a != null) {
+                datePartArray[MONTH] = a;
+            } else {
+                config._pf.invalidMonth = input;
+            }
+            break;
+        // DAY OF MONTH
+        case 'D' : // fall through to DD
+        case 'DD' :
+            if (input != null) {
+                datePartArray[DATE] = toInt(input);
+            }
+            break;
+        // DAY OF YEAR
+        case 'DDD' : // fall through to DDDD
+        case 'DDDD' :
+            if (input != null) {
+                config._dayOfYear = toInt(input);
+            }
+
+            break;
+        // YEAR
+        case 'YY' :
+            datePartArray[YEAR] = toInt(input) + (toInt(input) > 68 ? 1900 : 2000);
+            break;
+        case 'YYYY' :
+        case 'YYYYY' :
+        case 'YYYYYY' :
+            datePartArray[YEAR] = toInt(input);
+            break;
+        // AM / PM
+        case 'a' : // fall through to A
+        case 'A' :
+            config._isPm = getLangDefinition(config._l).isPM(input);
+            break;
+        // 24 HOUR
+        case 'H' : // fall through to hh
+        case 'HH' : // fall through to hh
+        case 'h' : // fall through to hh
+        case 'hh' :
+            datePartArray[HOUR] = toInt(input);
+            break;
+        // MINUTE
+        case 'm' : // fall through to mm
+        case 'mm' :
+            datePartArray[MINUTE] = toInt(input);
+            break;
+        // SECOND
+        case 's' : // fall through to ss
+        case 'ss' :
+            datePartArray[SECOND] = toInt(input);
+            break;
+        // MILLISECOND
+        case 'S' :
+        case 'SS' :
+        case 'SSS' :
+        case 'SSSS' :
+            datePartArray[MILLISECOND] = toInt(('0.' + input) * 1000);
+            break;
+        // UNIX TIMESTAMP WITH MS
+        case 'X':
+            config._d = new Date(parseFloat(input) * 1000);
+            break;
+        // TIMEZONE
+        case 'Z' : // fall through to ZZ
+        case 'ZZ' :
+            config._useUTC = true;
+            config._tzm = timezoneMinutesFromString(input);
+            break;
+        case 'w':
+        case 'ww':
+        case 'W':
+        case 'WW':
+        case 'd':
+        case 'dd':
+        case 'ddd':
+        case 'dddd':
+        case 'e':
+        case 'E':
+            token = token.substr(0, 1);
+            /* falls through */
+        case 'gg':
+        case 'gggg':
+        case 'GG':
+        case 'GGGG':
+        case 'GGGGG':
+            token = token.substr(0, 2);
+            if (input) {
+                config._w = config._w || {};
+                config._w[token] = input;
+            }
+            break;
+        }
+    }
+
+    // convert an array to a date.
+    // the array should mirror the parameters below
+    // note: all values past the year are optional and will default to the lowest possible value.
+    // [year, month, day , hour, minute, second, millisecond]
+    function dateFromConfig(config) {
+        var i, date, input = [], currentDate,
+            yearToUse, fixYear, w, temp, lang, weekday, week;
+
+        if (config._d) {
+            return;
+        }
+
+        currentDate = currentDateArray(config);
+
+        //compute day of the year from weeks and weekdays
+        if (config._w && config._a[DATE] == null && config._a[MONTH] == null) {
+            fixYear = function (val) {
+                var int_val = parseInt(val, 10);
+                return val ?
+                  (val.length < 3 ? (int_val > 68 ? 1900 + int_val : 2000 + int_val) : int_val) :
+                  (config._a[YEAR] == null ? moment().weekYear() : config._a[YEAR]);
+            };
+
+            w = config._w;
+            if (w.GG != null || w.W != null || w.E != null) {
+                temp = dayOfYearFromWeeks(fixYear(w.GG), w.W || 1, w.E, 4, 1);
+            }
+            else {
+                lang = getLangDefinition(config._l);
+                weekday = w.d != null ?  parseWeekday(w.d, lang) :
+                  (w.e != null ?  parseInt(w.e, 10) + lang._week.dow : 0);
+
+                week = parseInt(w.w, 10) || 1;
+
+                //if we're parsing 'd', then the low day numbers may be next week
+                if (w.d != null && weekday < lang._week.dow) {
+                    week++;
+                }
+
+                temp = dayOfYearFromWeeks(fixYear(w.gg), week, weekday, lang._week.doy, lang._week.dow);
+            }
+
+            config._a[YEAR] = temp.year;
+            config._dayOfYear = temp.dayOfYear;
+        }
+
+        //if the day of the year is set, figure out what it is
+        if (config._dayOfYear) {
+            yearToUse = config._a[YEAR] == null ? currentDate[YEAR] : config._a[YEAR];
+
+            if (config._dayOfYear > daysInYear(yearToUse)) {
+                config._pf._overflowDayOfYear = true;
+            }
+
+            date = makeUTCDate(yearToUse, 0, config._dayOfYear);
+            config._a[MONTH] = date.getUTCMonth();
+            config._a[DATE] = date.getUTCDate();
+        }
+
+        // Default to current date.
+        // * if no year, month, day of month are given, default to today
+        // * if day of month is given, default month and year
+        // * if month is given, default only year
+        // * if year is given, don't default anything
+        for (i = 0; i < 3 && config._a[i] == null; ++i) {
+            config._a[i] = input[i] = currentDate[i];
+        }
+
+        // Zero out whatever was not defaulted, including time
+        for (; i < 7; i++) {
+            config._a[i] = input[i] = (config._a[i] == null) ? (i === 2 ? 1 : 0) : config._a[i];
+        }
+
+        // add the offsets to the time to be parsed so that we can have a clean array for checking isValid
+        input[HOUR] += toInt((config._tzm || 0) / 60);
+        input[MINUTE] += toInt((config._tzm || 0) % 60);
+
+        config._d = (config._useUTC ? makeUTCDate : makeDate).apply(null, input);
+    }
+
+    function dateFromObject(config) {
+        var normalizedInput;
+
+        if (config._d) {
+            return;
+        }
+
+        normalizedInput = normalizeObjectUnits(config._i);
+        config._a = [
+            normalizedInput.year,
+            normalizedInput.month,
+            normalizedInput.day,
+            normalizedInput.hour,
+            normalizedInput.minute,
+            normalizedInput.second,
+            normalizedInput.millisecond
+        ];
+
+        dateFromConfig(config);
+    }
+
+    function currentDateArray(config) {
+        var now = new Date();
+        if (config._useUTC) {
+            return [
+                now.getUTCFullYear(),
+                now.getUTCMonth(),
+                now.getUTCDate()
+            ];
+        } else {
+            return [now.getFullYear(), now.getMonth(), now.getDate()];
+        }
+    }
+
+    // date from string and format string
+    function makeDateFromStringAndFormat(config) {
+
+        config._a = [];
+        config._pf.empty = true;
+
+        // This array is used to make a Date, either with `new Date` or `Date.UTC`
+        var lang = getLangDefinition(config._l),
+            string = '' + config._i,
+            i, parsedInput, tokens, token, skipped,
+            stringLength = string.length,
+            totalParsedInputLength = 0;
+
+        tokens = expandFormat(config._f, lang).match(formattingTokens) || [];
+
+        for (i = 0; i < tokens.length; i++) {
+            token = tokens[i];
+            parsedInput = (string.match(getParseRegexForToken(token, config)) || [])[0];
+            if (parsedInput) {
+                skipped = string.substr(0, string.indexOf(parsedInput));
+                if (skipped.length > 0) {
+                    config._pf.unusedInput.push(skipped);
+                }
+                string = string.slice(string.indexOf(parsedInput) + parsedInput.length);
+                totalParsedInputLength += parsedInput.length;
+            }
+            // don't parse if it's not a known token
+            if (formatTokenFunctions[token]) {
+                if (parsedInput) {
+                    config._pf.empty = false;
+                }
+                else {
+                    config._pf.unusedTokens.push(token);
+                }
+                addTimeToArrayFromToken(token, parsedInput, config);
+            }
+            else if (config._strict && !parsedInput) {
+                config._pf.unusedTokens.push(token);
+            }
+        }
+
+        // add remaining unparsed input length to the string
+        config._pf.charsLeftOver = stringLength - totalParsedInputLength;
+        if (string.length > 0) {
+            config._pf.unusedInput.push(string);
+        }
+
+        // handle am pm
+        if (config._isPm && config._a[HOUR] < 12) {
+            config._a[HOUR] += 12;
+        }
+        // if is 12 am, change hours to 0
+        if (config._isPm === false && config._a[HOUR] === 12) {
+            config._a[HOUR] = 0;
+        }
+
+        dateFromConfig(config);
+        checkOverflow(config);
+    }
+
+    function unescapeFormat(s) {
+        return s.replace(/\\(\[)|\\(\])|\[([^\]\[]*)\]|\\(.)/g, function (matched, p1, p2, p3, p4) {
+            return p1 || p2 || p3 || p4;
+        });
+    }
+
+    // Code from http://stackoverflow.com/questions/3561493/is-there-a-regexp-escape-function-in-javascript
+    function regexpEscape(s) {
+        return s.replace(/[-\/\\^$*+?.()|[\]{}]/g, '\\$&');
+    }
+
+    // date from string and array of format strings
+    function makeDateFromStringAndArray(config) {
+        var tempConfig,
+            bestMoment,
+
+            scoreToBeat,
+            i,
+            currentScore;
+
+        if (config._f.length === 0) {
+            config._pf.invalidFormat = true;
+            config._d = new Date(NaN);
+            return;
+        }
+
+        for (i = 0; i < config._f.length; i++) {
+            currentScore = 0;
+            tempConfig = extend({}, config);
+            initializeParsingFlags(tempConfig);
+            tempConfig._f = config._f[i];
+            makeDateFromStringAndFormat(tempConfig);
+
+            if (!isValid(tempConfig)) {
+                continue;
+            }
+
+            // if there is any input that was not parsed add a penalty for that format
+            currentScore += tempConfig._pf.charsLeftOver;
+
+            //or tokens
+            currentScore += tempConfig._pf.unusedTokens.length * 10;
+
+            tempConfig._pf.score = currentScore;
+
+            if (scoreToBeat == null || currentScore < scoreToBeat) {
+                scoreToBeat = currentScore;
+                bestMoment = tempConfig;
+            }
+        }
+
+        extend(config, bestMoment || tempConfig);
+    }
+
+    // date from iso format
+    function makeDateFromString(config) {
+        var i,
+            string = config._i,
+            match = isoRegex.exec(string);
+
+        if (match) {
+            config._pf.iso = true;
+            for (i = 4; i > 0; i--) {
+                if (match[i]) {
+                    // match[5] should be "T" or undefined
+                    config._f = isoDates[i - 1] + (match[6] || " ");
+                    break;
+                }
+            }
+            for (i = 0; i < 4; i++) {
+                if (isoTimes[i][1].exec(string)) {
+                    config._f += isoTimes[i][0];
+                    break;
+                }
+            }
+            if (string.match(parseTokenTimezone)) {
+                config._f += "Z";
+            }
+            makeDateFromStringAndFormat(config);
+        }
+        else {
+            config._d = new Date(string);
+        }
+    }
+
+    function makeDateFromInput(config) {
+        var input = config._i,
+            matched = aspNetJsonRegex.exec(input);
+
+        if (input === undefined) {
+            config._d = new Date();
+        } else if (matched) {
+            config._d = new Date(+matched[1]);
+        } else if (typeof input === 'string') {
+            makeDateFromString(config);
+        } else if (isArray(input)) {
+            config._a = input.slice(0);
+            dateFromConfig(config);
+        } else if (isDate(input)) {
+            config._d = new Date(+input);
+        } else if (typeof(input) === 'object') {
+            dateFromObject(config);
+        } else {
+            config._d = new Date(input);
+        }
+    }
+
+    function makeDate(y, m, d, h, M, s, ms) {
+        //can't just apply() to create a date:
+        //http://stackoverflow.com/questions/181348/instantiating-a-javascript-object-by-calling-prototype-constructor-apply
+        var date = new Date(y, m, d, h, M, s, ms);
+
+        //the date constructor doesn't accept years < 1970
+        if (y < 1970) {
+            date.setFullYear(y);
+        }
+        return date;
+    }
+
+    function makeUTCDate(y) {
+        var date = new Date(Date.UTC.apply(null, arguments));
+        if (y < 1970) {
+            date.setUTCFullYear(y);
+        }
+        return date;
+    }
+
+    function parseWeekday(input, language) {
+        if (typeof input === 'string') {
+            if (!isNaN(input)) {
+                input = parseInt(input, 10);
+            }
+            else {
+                input = language.weekdaysParse(input);
+                if (typeof input !== 'number') {
+                    return null;
+                }
+            }
+        }
+        return input;
+    }
+
+    /************************************
+        Relative Time
+    ************************************/
+
+
+    // helper function for moment.fn.from, moment.fn.fromNow, and moment.duration.fn.humanize
+    function substituteTimeAgo(string, number, withoutSuffix, isFuture, lang) {
+        return lang.relativeTime(number || 1, !!withoutSuffix, string, isFuture);
+    }
+
+    function relativeTime(milliseconds, withoutSuffix, lang) {
+        var seconds = round(Math.abs(milliseconds) / 1000),
+            minutes = round(seconds / 60),
+            hours = round(minutes / 60),
+            days = round(hours / 24),
+            years = round(days / 365),
+            args = seconds < 45 && ['s', seconds] ||
+                minutes === 1 && ['m'] ||
+                minutes < 45 && ['mm', minutes] ||
+                hours === 1 && ['h'] ||
+                hours < 22 && ['hh', hours] ||
+                days === 1 && ['d'] ||
+                days <= 25 && ['dd', days] ||
+                days <= 45 && ['M'] ||
+                days < 345 && ['MM', round(days / 30)] ||
+                years === 1 && ['y'] || ['yy', years];
+        args[2] = withoutSuffix;
+        args[3] = milliseconds > 0;
+        args[4] = lang;
+        return substituteTimeAgo.apply({}, args);
+    }
+
+
+    /************************************
+        Week of Year
+    ************************************/
+
+
+    // firstDayOfWeek       0 = sun, 6 = sat
+    //                      the day of the week that starts the week
+    //                      (usually sunday or monday)
+    // firstDayOfWeekOfYear 0 = sun, 6 = sat
+    //                      the first week is the week that contains the first
+    //                      of this day of the week
+    //                      (eg. ISO weeks use thursday (4))
+    function weekOfYear(mom, firstDayOfWeek, firstDayOfWeekOfYear) {
+        var end = firstDayOfWeekOfYear - firstDayOfWeek,
+            daysToDayOfWeek = firstDayOfWeekOfYear - mom.day(),
+            adjustedMoment;
+
+
+        if (daysToDayOfWeek > end) {
+            daysToDayOfWeek -= 7;
+        }
+
+        if (daysToDayOfWeek < end - 7) {
+            daysToDayOfWeek += 7;
+        }
+
+        adjustedMoment = moment(mom).add('d', daysToDayOfWeek);
+        return {
+            week: Math.ceil(adjustedMoment.dayOfYear() / 7),
+            year: adjustedMoment.year()
+        };
+    }
+
+    //http://en.wikipedia.org/wiki/ISO_week_date#Calculating_a_date_given_the_year.2C_week_number_and_weekday
+    function dayOfYearFromWeeks(year, week, weekday, firstDayOfWeekOfYear, firstDayOfWeek) {
+        // The only solid way to create an iso date from year is to use
+        // a string format (Date.UTC handles only years > 1900). Don't ask why
+        // it doesn't need Z at the end.
+        var d = new Date(leftZeroFill(year, 6, true) + '-01-01').getUTCDay(),
+            daysToAdd, dayOfYear;
+
+        weekday = weekday != null ? weekday : firstDayOfWeek;
+        daysToAdd = firstDayOfWeek - d + (d > firstDayOfWeekOfYear ? 7 : 0);
+        dayOfYear = 7 * (week - 1) + (weekday - firstDayOfWeek) + daysToAdd + 1;
+
+        return {
+            year: dayOfYear > 0 ? year : year - 1,
+            dayOfYear: dayOfYear > 0 ?  dayOfYear : daysInYear(year - 1) + dayOfYear
+        };
+    }
+
+    /************************************
+        Top Level Functions
+    ************************************/
+
+    function makeMoment(config) {
+        var input = config._i,
+            format = config._f;
+
+        if (typeof config._pf === 'undefined') {
+            initializeParsingFlags(config);
+        }
+
+        if (input === null) {
+            return moment.invalid({nullInput: true});
+        }
+
+        if (typeof input === 'string') {
+            config._i = input = getLangDefinition().preparse(input);
+        }
+
+        if (moment.isMoment(input)) {
+            config = extend({}, input);
+
+            config._d = new Date(+input._d);
+        } else if (format) {
+            if (isArray(format)) {
+                makeDateFromStringAndArray(config);
+            } else {
+                makeDateFromStringAndFormat(config);
+            }
+        } else {
+            makeDateFromInput(config);
+        }
+
+        return new Moment(config);
+    }
+
+    moment = function (input, format, lang, strict) {
+        if (typeof(lang) === "boolean") {
+            strict = lang;
+            lang = undefined;
+        }
+        return makeMoment({
+            _i : input,
+            _f : format,
+            _l : lang,
+            _strict : strict,
+            _isUTC : false
+        });
+    };
+
+    // creating with utc
+    moment.utc = function (input, format, lang, strict) {
+        var m;
+
+        if (typeof(lang) === "boolean") {
+            strict = lang;
+            lang = undefined;
+        }
+        m = makeMoment({
+            _useUTC : true,
+            _isUTC : true,
+            _l : lang,
+            _i : input,
+            _f : format,
+            _strict : strict
+        }).utc();
+
+        return m;
+    };
+
+    // creating with unix timestamp (in seconds)
+    moment.unix = function (input) {
+        return moment(input * 1000);
+    };
+
+    // duration
+    moment.duration = function (input, key) {
+        var duration = input,
+            // matching against regexp is expensive, do it on demand
+            match = null,
+            sign,
+            ret,
+            parseIso;
+
+        if (moment.isDuration(input)) {
+            duration = {
+                ms: input._milliseconds,
+                d: input._days,
+                M: input._months
+            };
+        } else if (typeof input === 'number') {
+            duration = {};
+            if (key) {
+                duration[key] = input;
+            } else {
+                duration.milliseconds = input;
+            }
+        } else if (!!(match = aspNetTimeSpanJsonRegex.exec(input))) {
+            sign = (match[1] === "-") ? -1 : 1;
+            duration = {
+                y: 0,
+                d: toInt(match[DATE]) * sign,
+                h: toInt(match[HOUR]) * sign,
+                m: toInt(match[MINUTE]) * sign,
+                s: toInt(match[SECOND]) * sign,
+                ms: toInt(match[MILLISECOND]) * sign
+            };
+        } else if (!!(match = isoDurationRegex.exec(input))) {
+            sign = (match[1] === "-") ? -1 : 1;
+            parseIso = function (inp) {
+                // We'd normally use ~~inp for this, but unfortunately it also
+                // converts floats to ints.
+                // inp may be undefined, so careful calling replace on it.
+                var res = inp && parseFloat(inp.replace(',', '.'));
+                // apply sign while we're at it
+                return (isNaN(res) ? 0 : res) * sign;
+            };
+            duration = {
+                y: parseIso(match[2]),
+                M: parseIso(match[3]),
+                d: parseIso(match[4]),
+                h: parseIso(match[5]),
+                m: parseIso(match[6]),
+                s: parseIso(match[7]),
+                w: parseIso(match[8])
+            };
+        }
+
+        ret = new Duration(duration);
+
+        if (moment.isDuration(input) && input.hasOwnProperty('_lang')) {
+            ret._lang = input._lang;
+        }
+
+        return ret;
+    };
+
+    // version number
+    moment.version = VERSION;
+
+    // default format
+    moment.defaultFormat = isoFormat;
+
+    // This function will be called whenever a moment is mutated.
+    // It is intended to keep the offset in sync with the timezone.
+    moment.updateOffset = function () {};
+
+    // This function will load languages and then set the global language.  If
+    // no arguments are passed in, it will simply return the current global
+    // language key.
+    moment.lang = function (key, values) {
+        var r;
+        if (!key) {
+            return moment.fn._lang._abbr;
+        }
+        if (values) {
+            loadLang(normalizeLanguage(key), values);
+        } else if (values === null) {
+            unloadLang(key);
+            key = 'en';
+        } else if (!languages[key]) {
+            getLangDefinition(key);
+        }
+        r = moment.duration.fn._lang = moment.fn._lang = getLangDefinition(key);
+        return r._abbr;
+    };
+
+    // returns language data
+    moment.langData = function (key) {
+        if (key && key._lang && key._lang._abbr) {
+            key = key._lang._abbr;
+        }
+        return getLangDefinition(key);
+    };
+
+    // compare moment object
+    moment.isMoment = function (obj) {
+        return obj instanceof Moment;
+    };
+
+    // for typechecking Duration objects
+    moment.isDuration = function (obj) {
+        return obj instanceof Duration;
+    };
+
+    for (i = lists.length - 1; i >= 0; --i) {
+        makeList(lists[i]);
+    }
+
+    moment.normalizeUnits = function (units) {
+        return normalizeUnits(units);
+    };
+
+    moment.invalid = function (flags) {
+        var m = moment.utc(NaN);
+        if (flags != null) {
+            extend(m._pf, flags);
+        }
+        else {
+            m._pf.userInvalidated = true;
+        }
+
+        return m;
+    };
+
+    moment.parseZone = function (input) {
+        return moment(input).parseZone();
+    };
+
+    /************************************
+        Moment Prototype
+    ************************************/
+
+
+    extend(moment.fn = Moment.prototype, {
+
+        clone : function () {
+            return moment(this);
+        },
+
+        valueOf : function () {
+            return +this._d + ((this._offset || 0) * 60000);
+        },
+
+        unix : function () {
+            return Math.floor(+this / 1000);
+        },
+
+        toString : function () {
+            return this.clone().lang('en').format("ddd MMM DD YYYY HH:mm:ss [GMT]ZZ");
+        },
+
+        toDate : function () {
+            return this._offset ? new Date(+this) : this._d;
+        },
+
+        toISOString : function () {
+            var m = moment(this).utc();
+            if (0 < m.year() && m.year() <= 9999) {
+                return formatMoment(m, 'YYYY-MM-DD[T]HH:mm:ss.SSS[Z]');
+            } else {
+                return formatMoment(m, 'YYYYYY-MM-DD[T]HH:mm:ss.SSS[Z]');
+            }
+        },
+
+        toArray : function () {
+            var m = this;
+            return [
+                m.year(),
+                m.month(),
+                m.date(),
+                m.hours(),
+                m.minutes(),
+                m.seconds(),
+                m.milliseconds()
+            ];
+        },
+
+        isValid : function () {
+            return isValid(this);
+        },
+
+        isDSTShifted : function () {
+
+            if (this._a) {
+                return this.isValid() && compareArrays(this._a, (this._isUTC ? moment.utc(this._a) : moment(this._a)).toArray()) > 0;
+            }
+
+            return false;
+        },
+
+        parsingFlags : function () {
+            return extend({}, this._pf);
+        },
+
+        invalidAt: function () {
+            return this._pf.overflow;
+        },
+
+        utc : function () {
+            return this.zone(0);
+        },
+
+        local : function () {
+            this.zone(0);
+            this._isUTC = false;
+            return this;
+        },
+
+        format : function (inputString) {
+            var output = formatMoment(this, inputString || moment.defaultFormat);
+            return this.lang().postformat(output);
+        },
+
+        add : function (input, val) {
+            var dur;
+            // switch args to support add('s', 1) and add(1, 's')
+            if (typeof input === 'string') {
+                dur = moment.duration(+val, input);
+            } else {
+                dur = moment.duration(input, val);
+            }
+            addOrSubtractDurationFromMoment(this, dur, 1);
+            return this;
+        },
+
+        subtract : function (input, val) {
+            var dur;
+            // switch args to support subtract('s', 1) and subtract(1, 's')
+            if (typeof input === 'string') {
+                dur = moment.duration(+val, input);
+            } else {
+                dur = moment.duration(input, val);
+            }
+            addOrSubtractDurationFromMoment(this, dur, -1);
+            return this;
+        },
+
+        diff : function (input, units, asFloat) {
+            var that = makeAs(input, this),
+                zoneDiff = (this.zone() - that.zone()) * 6e4,
+                diff, output;
+
+            units = normalizeUnits(units);
+
+            if (units === 'year' || units === 'month') {
+                // average number of days in the months in the given dates
+                diff = (this.daysInMonth() + that.daysInMonth()) * 432e5; // 24 * 60 * 60 * 1000 / 2
+                // difference in months
+                output = ((this.year() - that.year()) * 12) + (this.month() - that.month());
+                // adjust by taking difference in days, average number of days
+                // and dst in the given months.
+                output += ((this - moment(this).startOf('month')) -
+                        (that - moment(that).startOf('month'))) / diff;
+                // same as above but with zones, to negate all dst
+                output -= ((this.zone() - moment(this).startOf('month').zone()) -
+                        (that.zone() - moment(that).startOf('month').zone())) * 6e4 / diff;
+                if (units === 'year') {
+                    output = output / 12;
+                }
+            } else {
+                diff = (this - that);
+                output = units === 'second' ? diff / 1e3 : // 1000
+                    units === 'minute' ? diff / 6e4 : // 1000 * 60
+                    units === 'hour' ? diff / 36e5 : // 1000 * 60 * 60
+                    units === 'day' ? (diff - zoneDiff) / 864e5 : // 1000 * 60 * 60 * 24, negate dst
+                    units === 'week' ? (diff - zoneDiff) / 6048e5 : // 1000 * 60 * 60 * 24 * 7, negate dst
+                    diff;
+            }
+            return asFloat ? output : absRound(output);
+        },
+
+        from : function (time, withoutSuffix) {
+            return moment.duration(this.diff(time)).lang(this.lang()._abbr).humanize(!withoutSuffix);
+        },
+
+        fromNow : function (withoutSuffix) {
+            return this.from(moment(), withoutSuffix);
+        },
+
+        calendar : function () {
+            // We want to compare the start of today, vs this.
+            // Getting start-of-today depends on whether we're zone'd or not.
+            var sod = makeAs(moment(), this).startOf('day'),
+                diff = this.diff(sod, 'days', true),
+                format = diff < -6 ? 'sameElse' :
+                    diff < -1 ? 'lastWeek' :
+                    diff < 0 ? 'lastDay' :
+                    diff < 1 ? 'sameDay' :
+                    diff < 2 ? 'nextDay' :
+                    diff < 7 ? 'nextWeek' : 'sameElse';
+            return this.format(this.lang().calendar(format, this));
+        },
+
+        isLeapYear : function () {
+            return isLeapYear(this.year());
+        },
+
+        isDST : function () {
+            return (this.zone() < this.clone().month(0).zone() ||
+                this.zone() < this.clone().month(5).zone());
+        },
+
+        day : function (input) {
+            var day = this._isUTC ? this._d.getUTCDay() : this._d.getDay();
+            if (input != null) {
+                input = parseWeekday(input, this.lang());
+                return this.add({ d : input - day });
+            } else {
+                return day;
+            }
+        },
+
+        month : function (input) {
+            var utc = this._isUTC ? 'UTC' : '',
+                dayOfMonth;
+
+            if (input != null) {
+                if (typeof input === 'string') {
+                    input = this.lang().monthsParse(input);
+                    if (typeof input !== 'number') {
+                        return this;
+                    }
+                }
+
+                dayOfMonth = this.date();
+                this.date(1);
+                this._d['set' + utc + 'Month'](input);
+                this.date(Math.min(dayOfMonth, this.daysInMonth()));
+
+                moment.updateOffset(this);
+                return this;
+            } else {
+                return this._d['get' + utc + 'Month']();
+            }
+        },
+
+        startOf: function (units) {
+            units = normalizeUnits(units);
+            // the following switch intentionally omits break keywords
+            // to utilize falling through the cases.
+            switch (units) {
+            case 'year':
+                this.month(0);
+                /* falls through */
+            case 'month':
+                this.date(1);
+                /* falls through */
+            case 'week':
+            case 'isoWeek':
+            case 'day':
+                this.hours(0);
+                /* falls through */
+            case 'hour':
+                this.minutes(0);
+                /* falls through */
+            case 'minute':
+                this.seconds(0);
+                /* falls through */
+            case 'second':
+                this.milliseconds(0);
+                /* falls through */
+            }
+
+            // weeks are a special case
+            if (units === 'week') {
+                this.weekday(0);
+            } else if (units === 'isoWeek') {
+                this.isoWeekday(1);
+            }
+
+            return this;
+        },
+
+        endOf: function (units) {
+            units = normalizeUnits(units);
+            return this.startOf(units).add((units === 'isoWeek' ? 'week' : units), 1).subtract('ms', 1);
+        },
+
+        isAfter: function (input, units) {
+            units = typeof units !== 'undefined' ? units : 'millisecond';
+            return +this.clone().startOf(units) > +moment(input).startOf(units);
+        },
+
+        isBefore: function (input, units) {
+            units = typeof units !== 'undefined' ? units : 'millisecond';
+            return +this.clone().startOf(units) < +moment(input).startOf(units);
+        },
+
+        isSame: function (input, units) {
+            units = units || 'ms';
+            return +this.clone().startOf(units) === +makeAs(input, this).startOf(units);
+        },
+
+        min: function (other) {
+            other = moment.apply(null, arguments);
+            return other < this ? this : other;
+        },
+
+        max: function (other) {
+            other = moment.apply(null, arguments);
+            return other > this ? this : other;
+        },
+
+        zone : function (input) {
+            var offset = this._offset || 0;
+            if (input != null) {
+                if (typeof input === "string") {
+                    input = timezoneMinutesFromString(input);
+                }
+                if (Math.abs(input) < 16) {
+                    input = input * 60;
+                }
+                this._offset = input;
+                this._isUTC = true;
+                if (offset !== input) {
+                    addOrSubtractDurationFromMoment(this, moment.duration(offset - input, 'm'), 1, true);
+                }
+            } else {
+                return this._isUTC ? offset : this._d.getTimezoneOffset();
+            }
+            return this;
+        },
+
+        zoneAbbr : function () {
+            return this._isUTC ? "UTC" : "";
+        },
+
+        zoneName : function () {
+            return this._isUTC ? "Coordinated Universal Time" : "";
+        },
+
+        parseZone : function () {
+            if (this._tzm) {
+                this.zone(this._tzm);
+            } else if (typeof this._i === 'string') {
+                this.zone(this._i);
+            }
+            return this;
+        },
+
+        hasAlignedHourOffset : function (input) {
+            if (!input) {
+                input = 0;
+            }
+            else {
+                input = moment(input).zone();
+            }
+
+            return (this.zone() - input) % 60 === 0;
+        },
+
+        daysInMonth : function () {
+            return daysInMonth(this.year(), this.month());
+        },
+
+        dayOfYear : function (input) {
+            var dayOfYear = round((moment(this).startOf('day') - moment(this).startOf('year')) / 864e5) + 1;
+            return input == null ? dayOfYear : this.add("d", (input - dayOfYear));
+        },
+
+        quarter : function () {
+            return Math.ceil((this.month() + 1.0) / 3.0);
+        },
+
+        weekYear : function (input) {
+            var year = weekOfYear(this, this.lang()._week.dow, this.lang()._week.doy).year;
+            return input == null ? year : this.add("y", (input - year));
+        },
+
+        isoWeekYear : function (input) {
+            var year = weekOfYear(this, 1, 4).year;
+            return input == null ? year : this.add("y", (input - year));
+        },
+
+        week : function (input) {
+            var week = this.lang().week(this);
+            return input == null ? week : this.add("d", (input - week) * 7);
+        },
+
+        isoWeek : function (input) {
+            var week = weekOfYear(this, 1, 4).week;
+            return input == null ? week : this.add("d", (input - week) * 7);
+        },
+
+        weekday : function (input) {
+            var weekday = (this.day() + 7 - this.lang()._week.dow) % 7;
+            return input == null ? weekday : this.add("d", input - weekday);
+        },
+
+        isoWeekday : function (input) {
+            // behaves the same as moment#day except
+            // as a getter, returns 7 instead of 0 (1-7 range instead of 0-6)
+            // as a setter, sunday should belong to the previous week.
+            return input == null ? this.day() || 7 : this.day(this.day() % 7 ? input : input - 7);
+        },
+
+        get : function (units) {
+            units = normalizeUnits(units);
+            return this[units]();
+        },
+
+        set : function (units, value) {
+            units = normalizeUnits(units);
+            if (typeof this[units] === 'function') {
+                this[units](value);
+            }
+            return this;
+        },
+
+        // If passed a language key, it will set the language for this
+        // instance.  Otherwise, it will return the language configuration
+        // variables for this instance.
+        lang : function (key) {
+            if (key === undefined) {
+                return this._lang;
+            } else {
+                this._lang = getLangDefinition(key);
+                return this;
+            }
+        }
+    });
+
+    // helper for adding shortcuts
+    function makeGetterAndSetter(name, key) {
+        moment.fn[name] = moment.fn[name + 's'] = function (input) {
+            var utc = this._isUTC ? 'UTC' : '';
+            if (input != null) {
+                this._d['set' + utc + key](input);
+                moment.updateOffset(this);
+                return this;
+            } else {
+                return this._d['get' + utc + key]();
+            }
+        };
+    }
+
+    // loop through and add shortcuts (Month, Date, Hours, Minutes, Seconds, Milliseconds)
+    for (i = 0; i < proxyGettersAndSetters.length; i ++) {
+        makeGetterAndSetter(proxyGettersAndSetters[i].toLowerCase().replace(/s$/, ''), proxyGettersAndSetters[i]);
+    }
+
+    // add shortcut for year (uses different syntax than the getter/setter 'year' == 'FullYear')
+    makeGetterAndSetter('year', 'FullYear');
+
+    // add plural methods
+    moment.fn.days = moment.fn.day;
+    moment.fn.months = moment.fn.month;
+    moment.fn.weeks = moment.fn.week;
+    moment.fn.isoWeeks = moment.fn.isoWeek;
+
+    // add aliased format methods
+    moment.fn.toJSON = moment.fn.toISOString;
+
+    /************************************
+        Duration Prototype
+    ************************************/
+
+
+    extend(moment.duration.fn = Duration.prototype, {
+
+        _bubble : function () {
+            var milliseconds = this._milliseconds,
+                days = this._days,
+                months = this._months,
+                data = this._data,
+                seconds, minutes, hours, years;
+
+            // The following code bubbles up values, see the tests for
+            // examples of what that means.
+            data.milliseconds = milliseconds % 1000;
+
+            seconds = absRound(milliseconds / 1000);
+            data.seconds = seconds % 60;
+
+            minutes = absRound(seconds / 60);
+            data.minutes = minutes % 60;
+
+            hours = absRound(minutes / 60);
+            data.hours = hours % 24;
+
+            days += absRound(hours / 24);
+            data.days = days % 30;
+
+            months += absRound(days / 30);
+            data.months = months % 12;
+
+            years = absRound(months / 12);
+            data.years = years;
+        },
+
+        weeks : function () {
+            return absRound(this.days() / 7);
+        },
+
+        valueOf : function () {
+            return this._milliseconds +
+              this._days * 864e5 +
+              (this._months % 12) * 2592e6 +
+              toInt(this._months / 12) * 31536e6;
+        },
+
+        humanize : function (withSuffix) {
+            var difference = +this,
+                output = relativeTime(difference, !withSuffix, this.lang());
+
+            if (withSuffix) {
+                output = this.lang().pastFuture(difference, output);
+            }
+
+            return this.lang().postformat(output);
+        },
+
+        add : function (input, val) {
+            // supports only 2.0-style add(1, 's') or add(moment)
+            var dur = moment.duration(input, val);
+
+            this._milliseconds += dur._milliseconds;
+            this._days += dur._days;
+            this._months += dur._months;
+
+            this._bubble();
+
+            return this;
+        },
+
+        subtract : function (input, val) {
+            var dur = moment.duration(input, val);
+
+            this._milliseconds -= dur._milliseconds;
+            this._days -= dur._days;
+            this._months -= dur._months;
+
+            this._bubble();
+
+            return this;
+        },
+
+        get : function (units) {
+            units = normalizeUnits(units);
+            return this[units.toLowerCase() + 's']();
+        },
+
+        as : function (units) {
+            units = normalizeUnits(units);
+            return this['as' + units.charAt(0).toUpperCase() + units.slice(1) + 's']();
+        },
+
+        lang : moment.fn.lang,
+
+        toIsoString : function () {
+            // inspired by https://github.com/dordille/moment-isoduration/blob/master/moment.isoduration.js
+            var years = Math.abs(this.years()),
+                months = Math.abs(this.months()),
+                days = Math.abs(this.days()),
+                hours = Math.abs(this.hours()),
+                minutes = Math.abs(this.minutes()),
+                seconds = Math.abs(this.seconds() + this.milliseconds() / 1000);
+
+            if (!this.asSeconds()) {
+                // this is the same as C#'s (Noda) and python (isodate)...
+                // but not other JS (goog.date)
+                return 'P0D';
+            }
+
+            return (this.asSeconds() < 0 ? '-' : '') +
+                'P' +
+                (years ? years + 'Y' : '') +
+                (months ? months + 'M' : '') +
+                (days ? days + 'D' : '') +
+                ((hours || minutes || seconds) ? 'T' : '') +
+                (hours ? hours + 'H' : '') +
+                (minutes ? minutes + 'M' : '') +
+                (seconds ? seconds + 'S' : '');
+        }
+    });
+
+    function makeDurationGetter(name) {
+        moment.duration.fn[name] = function () {
+            return this._data[name];
+        };
+    }
+
+    function makeDurationAsGetter(name, factor) {
+        moment.duration.fn['as' + name] = function () {
+            return +this / factor;
+        };
+    }
+
+    for (i in unitMillisecondFactors) {
+        if (unitMillisecondFactors.hasOwnProperty(i)) {
+            makeDurationAsGetter(i, unitMillisecondFactors[i]);
+            makeDurationGetter(i.toLowerCase());
+        }
+    }
+
+    makeDurationAsGetter('Weeks', 6048e5);
+    moment.duration.fn.asMonths = function () {
+        return (+this - this.years() * 31536e6) / 2592e6 + this.years() * 12;
+    };
+
+
+    /************************************
+        Default Lang
+    ************************************/
+
+
+    // Set default language, other languages will inherit from English.
+    moment.lang('en', {
+        ordinal : function (number) {
+            var b = number % 10,
+                output = (toInt(number % 100 / 10) === 1) ? 'th' :
+                (b === 1) ? 'st' :
+                (b === 2) ? 'nd' :
+                (b === 3) ? 'rd' : 'th';
+            return number + output;
+        }
+    });
+
+    /* EMBED_LANGUAGES */
+
+    /************************************
+        Exposing Moment
+    ************************************/
+
+    function makeGlobal(deprecate) {
+        var warned = false, local_moment = moment;
+        /*global ender:false */
+        if (typeof ender !== 'undefined') {
+            return;
+        }
+        // here, `this` means `window` in the browser, or `global` on the server
+        // add `moment` as a global object via a string identifier,
+        // for Closure Compiler "advanced" mode
+        if (deprecate) {
+            global.moment = function () {
+                if (!warned && console && console.warn) {
+                    warned = true;
+                    console.warn(
+                            "Accessing Moment through the global scope is " +
+                            "deprecated, and will be removed in an upcoming " +
+                            "release.");
+                }
+                return local_moment.apply(null, arguments);
+            };
+            extend(global.moment, local_moment);
+        } else {
+            global['moment'] = moment;
+        }
+    }
+
+    // CommonJS module is defined
+    if (hasModule) {
+        module.exports = moment;
+        makeGlobal(true);
+    } else if (typeof define === "function" && define.amd) {
+        define("moment", function (require, exports, module) {
+            if (module.config && module.config() && module.config().noGlobal !== true) {
+                // If user provided noGlobal, he is aware of global
+                makeGlobal(module.config().noGlobal === undefined);
+            }
+
+            return moment;
+        });
+    } else {
+        makeGlobal();
+    }
+}).call(this);
+
+},{}]},{},[1])
+(1)
+});
\ No newline at end of file
diff --git a/dist/vis.min.js b/dist/vis.min.js
new file mode 100644
index 00000000..8ca53878
--- /dev/null
+++ b/dist/vis.min.js
@@ -0,0 +1,29 @@
+/**
+ * vis.js
+ * https://github.com/almende/vis
+ *
+ * A dynamic, browser-based visualization library.
+ *
+ * @version 0.3.0
+ * @date    2014-01-14
+ *
+ * @license
+ * Copyright (C) 2011-2013 Almende B.V, http://almende.com
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may not
+ * use this file except in compliance with the License. You may obtain a copy
+ * of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations under
+ * the License.
+ */
+!function(t){if("object"==typeof exports)module.exports=t();else if("function"==typeof define&&define.amd)define(t);else{var e;"undefined"!=typeof window?e=window:"undefined"!=typeof global?e=global:"undefined"!=typeof self&&(e=self),e.vis=t()}}(function(){var t;return function e(t,i,n){function s(o,a){if(!i[o]){if(!t[o]){var h="function"==typeof require&&require;if(!a&&h)return h(o,!0);if(r)return r(o,!0);throw new Error("Cannot find module '"+o+"'")}var d=i[o]={exports:{}};t[o][0].call(d.exports,function(e){var i=t[o][1][e];return s(i?i:e)},d,d.exports,e,t,i,n)}return i[o].exports}for(var r="function"==typeof require&&require,o=0;o<n.length;o++)s(n[o]);return s}({1:[function(e,i,n){function s(){this.subscriptions=[]}function r(t){if(this.id=A.randomUUID(),this.options=t||{},this.data={},this.fieldId=this.options.fieldId||"id",this.convert={},this.options.convert)for(var e in this.options.convert)if(this.options.convert.hasOwnProperty(e)){var i=this.options.convert[e];this.convert[e]="Date"==i||"ISODate"==i||"ASPDate"==i?"Date":i}this.subscribers={},this.internalIds={}}function o(t,e){this.id=A.randomUUID(),this.data=null,this.ids={},this.options=e||{},this.fieldId="id",this.subscribers={};var i=this;this.listener=function(){i._onEvent.apply(i,arguments)},this.setData(t)}function a(t,e){this.parent=t,this.options=e||{},this.defaultOptions={order:function(t,e){if(t instanceof E){if(e instanceof E){var i=t.data.end-t.data.start,n=e.data.end-e.data.start;return i-n||t.data.start-e.data.start}return-1}return e instanceof E?1:t.data.start-e.data.start},margin:{item:10}},this.ordered=[]}function h(t){this.id=A.randomUUID(),this.start=null,this.end=null,this.options=t||{},this.setOptions(t)}function d(t){if("horizontal"!=t&&"vertical"!=t)throw new TypeError('Unknown direction "'+t+'". 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m(t,e,i){this.id=A.randomUUID(),this.parent=t,this.depends=e,this.dom={majorLines:[],majorTexts:[],minorLines:[],minorTexts:[],redundant:{majorLines:[],majorTexts:[],minorLines:[],minorTexts:[]}},this.props={range:{start:0,end:0,minimumStep:0},lineTop:0},this.options=i||{},this.defaultOptions={orientation:"bottom",showMinorLabels:!0,showMajorLabels:!0},this.conversion=null,this.range=null}function g(t,e,i){this.id=A.randomUUID(),this.parent=t,this.depends=e,this.options=i||{},this.defaultOptions={showCurrentTime:!1}}function v(t,e,i){this.id=A.randomUUID(),this.parent=t,this.depends=e,this.options=i||{},this.defaultOptions={showCustomTime:!1},this.listeners=[],this.customTime=new Date}function y(t,e,i){this.id=A.randomUUID(),this.parent=t,this.depends=e,this.options=i||{},this.defaultOptions={type:"box",align:"center",orientation:"bottom",margin:{axis:20,item:10},padding:5},this.dom={};var n=this;this.itemsData=null,this.range=null,this.listeners={add:function(t,e,i){i!=n.id&&n._onAdd(e.items)},update:function(t,e,i){i!=n.id&&n._onUpdate(e.items)},remove:function(t,e,i){i!=n.id&&n._onRemove(e.items)}},this.items={},this.queue={},this.stack=new a(this,Object.create(this.options)),this.conversion=null}function w(t,e,i,n){this.parent=t,this.data=e,this.dom=null,this.options=i||{},this.defaultOptions=n||{},this.selected=!1,this.visible=!1,this.top=0,this.left=0,this.width=0,this.height=0}function _(t,e,i,n){this.props={dot:{left:0,top:0,width:0,height:0},line:{top:0,left:0,width:0,height:0}},w.call(this,t,e,i,n)}function b(t,e,i,n){this.props={dot:{top:0,width:0,height:0},content:{height:0,marginLeft:0}},w.call(this,t,e,i,n)}function E(t,e,i,n){this.props={content:{left:0,width:0}},w.call(this,t,e,i,n)}function T(t,e,i,n){this.props={content:{left:0,width:0}},E.call(this,t,e,i,n)}function 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o)o.hasOwnProperty(n)&&(s=this._getItem(n,d),a(s)&&r.push(s));for(this._sort(r,h),e=0,i=r.length;i>e;e++)c[e]=r[e][this.fieldId]}else for(n in o)o.hasOwnProperty(n)&&(s=this._getItem(n,d),a(s)&&c.push(s[this.fieldId]));else if(h){r=[];for(n in o)o.hasOwnProperty(n)&&r.push(o[n]);for(this._sort(r,h),e=0,i=r.length;i>e;e++)c[e]=r[e][this.fieldId]}else for(n in o)o.hasOwnProperty(n)&&(s=o[n],c.push(s[this.fieldId]));return c},r.prototype.forEach=function(t,e){var i,n,s=e&&e.filter,r=e&&e.convert||this.options.convert,o=this.data;if(e&&e.order)for(var a=this.get(e),h=0,d=a.length;d>h;h++)i=a[h],n=i[this.fieldId],t(i,n);else for(n in o)o.hasOwnProperty(n)&&(i=this._getItem(n,r),(!s||s(i))&&t(i,n))},r.prototype.map=function(t,e){var i,n=e&&e.filter,s=e&&e.convert||this.options.convert,r=[],o=this.data;for(var a in o)o.hasOwnProperty(a)&&(i=this._getItem(a,s),(!n||n(i))&&r.push(t(i,a)));return e&&e.order&&this._sort(r,e.order),r},r.prototype._filterFields=function(t,e){var i={};for(var n in t)t.hasOwnProperty(n)&&-1!=e.indexOf(n)&&(i[n]=t[n]);return i},r.prototype._sort=function(t,e){if(A.isString(e)){var i=e;t.sort(function(t,e){var n=t[i],s=e[i];return n>s?1:s>n?-1:0})}else{if("function"!=typeof e)throw new TypeError("Order must be a function or a string");t.sort(e)}},r.prototype.remove=function(t,e){var i,n,s,r=[];if(t instanceof Array)for(i=0,n=t.length;n>i;i++)s=this._remove(t[i]),null!=s&&r.push(s);else s=this._remove(t),null!=s&&r.push(s);return r.length&&this._trigger("remove",{items:r},e),r},r.prototype._remove=function(t){if(A.isNumber(t)||A.isString(t)){if(this.data[t])return delete this.data[t],delete this.internalIds[t],t}else if(t instanceof Object){var e=t[this.fieldId];if(e&&this.data[e])return delete this.data[e],delete this.internalIds[e],e}return null},r.prototype.clear=function(t){var e=Object.keys(this.data);return this.data={},this.internalIds={},this._trigger("remove",{items:e},t),e},r.prototype.max=function(t){var e=this.data,i=null,n=null;for(var s in e)if(e.hasOwnProperty(s)){var r=e[s],o=r[t];null!=o&&(!i||o>n)&&(i=r,n=o)}return i},r.prototype.min=function(t){var e=this.data,i=null,n=null;for(var s in e)if(e.hasOwnProperty(s)){var r=e[s],o=r[t];null!=o&&(!i||n>o)&&(i=r,n=o)}return i},r.prototype.distinct=function(t){var e=this.data,i=[],n=this.options.convert[t],s=0;for(var r in e)if(e.hasOwnProperty(r)){for(var o=e[r],a=A.convert(o[t],n),h=!1,d=0;s>d;d++)if(i[d]==a){h=!0;break}h||(i[s]=a,s++)}return i},r.prototype._addItem=function(t){var e=t[this.fieldId];if(void 0!=e){if(this.data[e])throw new Error("Cannot add item: item with id "+e+" already exists")}else e=A.randomUUID(),t[this.fieldId]=e,this.internalIds[e]=t;var i={};for(var n in t)if(t.hasOwnProperty(n)){var s=this.convert[n];i[n]=A.convert(t[n],s)}return this.data[e]=i,e},r.prototype._getItem=function(t,e){var i,n,s=this.data[t];if(!s)return null;var r={},o=this.fieldId,a=this.internalIds;if(e)for(i in s)s.hasOwnProperty(i)&&(n=s[i],i==o&&n in a||(r[i]=A.convert(n,e[i])));else for(i in s)s.hasOwnProperty(i)&&(n=s[i],i==o&&n in a||(r[i]=n));return r},r.prototype._updateItem=function(t){var e=t[this.fieldId];if(void 0==e)throw new Error("Cannot update item: item has no id (item: "+JSON.stringify(t)+")");var i=this.data[e];if(!i)throw new Error("Cannot update item: no item with id "+e+" found");for(var n in t)if(t.hasOwnProperty(n)){var s=this.convert[n];i[n]=A.convert(t[n],s)}return e},r.prototype._getColumnNames=function(t){for(var e=[],i=0,n=t.getNumberOfColumns();n>i;i++)e[i]=t.getColumnId(i)||t.getColumnLabel(i);return e},r.prototype._appendRow=function(t,e,i){for(var n=t.addRow(),s=0,r=e.length;r>s;s++){var o=e[s];t.setValue(n,s,i[o])}},o.prototype.setData=function(t){var e,i,n;if(this.data){this.data.unsubscribe&&this.data.unsubscribe("*",this.listener),e=[];for(var s in this.ids)this.ids.hasOwnProperty(s)&&e.push(s);this.ids={},this._trigger("remove",{items:e})}if(this.data=t,this.data){for(this.fieldId=this.options.fieldId||this.data&&this.data.options&&this.data.options.fieldId||"id",e=this.data.getIds({filter:this.options&&this.options.filter}),i=0,n=e.length;n>i;i++)s=e[i],this.ids[s]=!0;this._trigger("add",{items:e}),this.data.subscribe&&this.data.subscribe("*",this.listener)}},o.prototype.get=function(){var t,e,i,n=this,s=A.getType(arguments[0]);"String"==s||"Number"==s||"Array"==s?(t=arguments[0],e=arguments[1],i=arguments[2]):(e=arguments[0],i=arguments[1]);var r=A.extend({},this.options,e);this.options.filter&&e&&e.filter&&(r.filter=function(t){return n.options.filter(t)&&e.filter(t)});var o=[];return void 0!=t&&o.push(t),o.push(r),o.push(i),this.data&&this.data.get.apply(this.data,o)},o.prototype.getIds=function(t){var e;if(this.data){var i,n=this.options.filter;i=t&&t.filter?n?function(e){return n(e)&&t.filter(e)}:t.filter:n,e=this.data.getIds({filter:i,order:t&&t.order})}else e=[];return e},o.prototype._onEvent=function(t,e,i){var n,s,r,o,a=e&&e.items,h=this.data,d=[],c=[],u=[];if(a&&h){switch(t){case"add":for(n=0,s=a.length;s>n;n++)r=a[n],o=this.get(r),o&&(this.ids[r]=!0,d.push(r));break;case"update":for(n=0,s=a.length;s>n;n++)r=a[n],o=this.get(r),o?this.ids[r]?c.push(r):(this.ids[r]=!0,d.push(r)):this.ids[r]&&(delete this.ids[r],u.push(r));break;case"remove":for(n=0,s=a.length;s>n;n++)r=a[n],this.ids[r]&&(delete this.ids[r],u.push(r))}d.length&&this._trigger("add",{items:d},i),c.length&&this._trigger("update",{items:c},i),u.length&&this._trigger("remove",{items:u},i)}},o.prototype.subscribe=r.prototype.subscribe,o.prototype.unsubscribe=r.prototype.unsubscribe,o.prototype._trigger=r.prototype._trigger,TimeStep=function(t,e,i){this.current=new Date,this._start=new Date,this._end=new Date,this.autoScale=!0,this.scale=TimeStep.SCALE.DAY,this.step=1,this.setRange(t,e,i)},TimeStep.SCALE={MILLISECOND:1,SECOND:2,MINUTE:3,HOUR:4,DAY:5,WEEKDAY:6,MONTH:7,YEAR:8},TimeStep.prototype.setRange=function(t,e,i){if(!(t instanceof Date&&e instanceof Date))throw"No legal start or end date in method setRange";this._start=void 0!=t?new Date(t.valueOf()):new Date,this._end=void 0!=e?new Date(e.valueOf()):new Date,this.autoScale&&this.setMinimumStep(i)},TimeStep.prototype.first=function(){this.current=new Date(this._start.valueOf()),this.roundToMinor()},TimeStep.prototype.roundToMinor=function(){switch(this.scale){case TimeStep.SCALE.YEAR:this.current.setFullYear(this.step*Math.floor(this.current.getFullYear()/this.step)),this.current.setMonth(0);case TimeStep.SCALE.MONTH:this.current.setDate(1);case TimeStep.SCALE.DAY:case TimeStep.SCALE.WEEKDAY:this.current.setHours(0);case TimeStep.SCALE.HOUR:this.current.setMinutes(0);case TimeStep.SCALE.MINUTE:this.current.setSeconds(0);case TimeStep.SCALE.SECOND:this.current.setMilliseconds(0)}if(1!=this.step)switch(this.scale){case TimeStep.SCALE.MILLISECOND:this.current.setMilliseconds(this.current.getMilliseconds()-this.current.getMilliseconds()%this.step);break;case TimeStep.SCALE.SECOND:this.current.setSeconds(this.current.getSeconds()-this.current.getSeconds()%this.step);break;case TimeStep.SCALE.MINUTE:this.current.setMinutes(this.current.getMinutes()-this.current.getMinutes()%this.step);break;case TimeStep.SCALE.HOUR:this.current.setHours(this.current.getHours()-this.current.getHours()%this.step);break;case TimeStep.SCALE.WEEKDAY:case TimeStep.SCALE.DAY:this.current.setDate(this.current.getDate()-1-(this.current.getDate()-1)%this.step+1);break;case TimeStep.SCALE.MONTH:this.current.setMonth(this.current.getMonth()-this.current.getMonth()%this.step);break;case TimeStep.SCALE.YEAR:this.current.setFullYear(this.current.getFullYear()-this.current.getFullYear()%this.step)}},TimeStep.prototype.hasNext=function(){return this.current.valueOf()<=this._end.valueOf()},TimeStep.prototype.next=function(){var t=this.current.valueOf();if(this.current.getMonth()<6)switch(this.scale){case TimeStep.SCALE.MILLISECOND:this.current=new Date(this.current.valueOf()+this.step);break;case TimeStep.SCALE.SECOND:this.current=new Date(this.current.valueOf()+1e3*this.step);break;case TimeStep.SCALE.MINUTE:this.current=new Date(this.current.valueOf()+1e3*this.step*60);break;case TimeStep.SCALE.HOUR:this.current=new Date(this.current.valueOf()+1e3*this.step*60*60);var e=this.current.getHours();this.current.setHours(e-e%this.step);break;case TimeStep.SCALE.WEEKDAY:case TimeStep.SCALE.DAY:this.current.setDate(this.current.getDate()+this.step);break;case TimeStep.SCALE.MONTH:this.current.setMonth(this.current.getMonth()+this.step);break;case TimeStep.SCALE.YEAR:this.current.setFullYear(this.current.getFullYear()+this.step)}else switch(this.scale){case TimeStep.SCALE.MILLISECOND:this.current=new Date(this.current.valueOf()+this.step);break;case TimeStep.SCALE.SECOND:this.current.setSeconds(this.current.getSeconds()+this.step);break;case TimeStep.SCALE.MINUTE:this.current.setMinutes(this.current.getMinutes()+this.step);break;case TimeStep.SCALE.HOUR:this.current.setHours(this.current.getHours()+this.step);break;case TimeStep.SCALE.WEEKDAY:case TimeStep.SCALE.DAY:this.current.setDate(this.current.getDate()+this.step);break;case TimeStep.SCALE.MONTH:this.current.setMonth(this.current.getMonth()+this.step);break;case TimeStep.SCALE.YEAR:this.current.setFullYear(this.current.getFullYear()+this.step)}if(1!=this.step)switch(this.scale){case TimeStep.SCALE.MILLISECOND:this.current.getMilliseconds()<this.step&&this.current.setMilliseconds(0);break;case TimeStep.SCALE.SECOND:this.current.getSeconds()<this.step&&this.current.setSeconds(0);break;case TimeStep.SCALE.MINUTE:this.current.getMinutes()<this.step&&this.current.setMinutes(0);
+break;case TimeStep.SCALE.HOUR:this.current.getHours()<this.step&&this.current.setHours(0);break;case TimeStep.SCALE.WEEKDAY:case TimeStep.SCALE.DAY:this.current.getDate()<this.step+1&&this.current.setDate(1);break;case TimeStep.SCALE.MONTH:this.current.getMonth()<this.step&&this.current.setMonth(0);break;case TimeStep.SCALE.YEAR:}this.current.valueOf()==t&&(this.current=new Date(this._end.valueOf()))},TimeStep.prototype.getCurrent=function(){return this.current},TimeStep.prototype.setScale=function(t,e){this.scale=t,e>0&&(this.step=e),this.autoScale=!1},TimeStep.prototype.setAutoScale=function(t){this.autoScale=t},TimeStep.prototype.setMinimumStep=function(t){if(void 0!=t){var e=31104e6,i=2592e6,n=864e5,s=36e5,r=6e4,o=1e3,a=1;1e3*e>t&&(this.scale=TimeStep.SCALE.YEAR,this.step=1e3),500*e>t&&(this.scale=TimeStep.SCALE.YEAR,this.step=500),100*e>t&&(this.scale=TimeStep.SCALE.YEAR,this.step=100),50*e>t&&(this.scale=TimeStep.SCALE.YEAR,this.step=50),10*e>t&&(this.scale=TimeStep.SCALE.YEAR,this.step=10),5*e>t&&(this.scale=TimeStep.SCALE.YEAR,this.step=5),e>t&&(this.scale=TimeStep.SCALE.YEAR,this.step=1),3*i>t&&(this.scale=TimeStep.SCALE.MONTH,this.step=3),i>t&&(this.scale=TimeStep.SCALE.MONTH,this.step=1),5*n>t&&(this.scale=TimeStep.SCALE.DAY,this.step=5),2*n>t&&(this.scale=TimeStep.SCALE.DAY,this.step=2),n>t&&(this.scale=TimeStep.SCALE.DAY,this.step=1),n/2>t&&(this.scale=TimeStep.SCALE.WEEKDAY,this.step=1),4*s>t&&(this.scale=TimeStep.SCALE.HOUR,this.step=4),s>t&&(this.scale=TimeStep.SCALE.HOUR,this.step=1),15*r>t&&(this.scale=TimeStep.SCALE.MINUTE,this.step=15),10*r>t&&(this.scale=TimeStep.SCALE.MINUTE,this.step=10),5*r>t&&(this.scale=TimeStep.SCALE.MINUTE,this.step=5),r>t&&(this.scale=TimeStep.SCALE.MINUTE,this.step=1),15*o>t&&(this.scale=TimeStep.SCALE.SECOND,this.step=15),10*o>t&&(this.scale=TimeStep.SCALE.SECOND,this.step=10),5*o>t&&(this.scale=TimeStep.SCALE.SECOND,this.step=5),o>t&&(this.scale=TimeStep.SCALE.SECOND,this.step=1),200*a>t&&(this.scale=TimeStep.SCALE.MILLISECOND,this.step=200),100*a>t&&(this.scale=TimeStep.SCALE.MILLISECOND,this.step=100),50*a>t&&(this.scale=TimeStep.SCALE.MILLISECOND,this.step=50),10*a>t&&(this.scale=TimeStep.SCALE.MILLISECOND,this.step=10),5*a>t&&(this.scale=TimeStep.SCALE.MILLISECOND,this.step=5),a>t&&(this.scale=TimeStep.SCALE.MILLISECOND,this.step=1)}},TimeStep.prototype.snap=function(t){if(this.scale==TimeStep.SCALE.YEAR){var e=t.getFullYear()+Math.round(t.getMonth()/12);t.setFullYear(Math.round(e/this.step)*this.step),t.setMonth(0),t.setDate(0),t.setHours(0),t.setMinutes(0),t.setSeconds(0),t.setMilliseconds(0)}else if(this.scale==TimeStep.SCALE.MONTH)t.getDate()>15?(t.setDate(1),t.setMonth(t.getMonth()+1)):t.setDate(1),t.setHours(0),t.setMinutes(0),t.setSeconds(0),t.setMilliseconds(0);else if(this.scale==TimeStep.SCALE.DAY||this.scale==TimeStep.SCALE.WEEKDAY){switch(this.step){case 5:case 2:t.setHours(24*Math.round(t.getHours()/24));break;default:t.setHours(12*Math.round(t.getHours()/12))}t.setMinutes(0),t.setSeconds(0),t.setMilliseconds(0)}else if(this.scale==TimeStep.SCALE.HOUR){switch(this.step){case 4:t.setMinutes(60*Math.round(t.getMinutes()/60));break;default:t.setMinutes(30*Math.round(t.getMinutes()/30))}t.setSeconds(0),t.setMilliseconds(0)}else if(this.scale==TimeStep.SCALE.MINUTE){switch(this.step){case 15:case 10:t.setMinutes(5*Math.round(t.getMinutes()/5)),t.setSeconds(0);break;case 5:t.setSeconds(60*Math.round(t.getSeconds()/60));break;default:t.setSeconds(30*Math.round(t.getSeconds()/30))}t.setMilliseconds(0)}else if(this.scale==TimeStep.SCALE.SECOND)switch(this.step){case 15:case 10:t.setSeconds(5*Math.round(t.getSeconds()/5)),t.setMilliseconds(0);break;case 5:t.setMilliseconds(1e3*Math.round(t.getMilliseconds()/1e3));break;default:t.setMilliseconds(500*Math.round(t.getMilliseconds()/500))}else if(this.scale==TimeStep.SCALE.MILLISECOND){var i=this.step>5?this.step/2:1;t.setMilliseconds(Math.round(t.getMilliseconds()/i)*i)}},TimeStep.prototype.isMajor=function(){switch(this.scale){case TimeStep.SCALE.MILLISECOND:return 0==this.current.getMilliseconds();case TimeStep.SCALE.SECOND:return 0==this.current.getSeconds();case TimeStep.SCALE.MINUTE:return 0==this.current.getHours()&&0==this.current.getMinutes();case TimeStep.SCALE.HOUR:return 0==this.current.getHours();case TimeStep.SCALE.WEEKDAY:case TimeStep.SCALE.DAY:return 1==this.current.getDate();case TimeStep.SCALE.MONTH:return 0==this.current.getMonth();case TimeStep.SCALE.YEAR:return!1;default:return!1}},TimeStep.prototype.getLabelMinor=function(t){switch(void 0==t&&(t=this.current),this.scale){case TimeStep.SCALE.MILLISECOND:return I(t).format("SSS");case TimeStep.SCALE.SECOND:return I(t).format("s");case TimeStep.SCALE.MINUTE:return I(t).format("HH:mm");case TimeStep.SCALE.HOUR:return I(t).format("HH:mm");case TimeStep.SCALE.WEEKDAY:return I(t).format("ddd D");case TimeStep.SCALE.DAY:return I(t).format("D");case TimeStep.SCALE.MONTH:return I(t).format("MMM");case TimeStep.SCALE.YEAR:return I(t).format("YYYY");default:return""}},TimeStep.prototype.getLabelMajor=function(t){switch(void 0==t&&(t=this.current),this.scale){case TimeStep.SCALE.MILLISECOND:return I(t).format("HH:mm:ss");case TimeStep.SCALE.SECOND:return I(t).format("D MMMM HH:mm");case TimeStep.SCALE.MINUTE:case TimeStep.SCALE.HOUR:return I(t).format("ddd D MMMM");case TimeStep.SCALE.WEEKDAY:case TimeStep.SCALE.DAY:return I(t).format("MMMM YYYY");case TimeStep.SCALE.MONTH:return I(t).format("YYYY");case TimeStep.SCALE.YEAR:return"";default:return""}},a.prototype.setOptions=function(t){A.extend(this.options,t)},a.prototype.update=function(){this._order(),this._stack()},a.prototype._order=function(){var t=this.parent.items;if(!t)throw new Error("Cannot stack items: parent does not contain items");var e=[],i=0;A.forEach(t,function(t){t.visible&&(e[i]=t,i++)});var n=this.options.order||this.defaultOptions.order;if("function"!=typeof n)throw new Error("Option order must be a function");e.sort(n),this.ordered=e},a.prototype._stack=function(){var t,e,i,n=this.ordered,s=this.options,r=s.orientation||this.defaultOptions.orientation,o="top"==r;for(i=s.margin&&void 0!==s.margin.item?s.margin.item:this.defaultOptions.margin.item,t=0,e=n.length;e>t;t++){var a=n[t],h=null;do h=this.checkOverlap(n,t,0,t-1,i),null!=h&&(a.top=o?h.top+h.height+i:h.top-a.height-i);while(h)}},a.prototype.checkOverlap=function(t,e,i,n,s){for(var r=this.collision,o=t[e],a=n;a>=i;a--){var h=t[a];if(r(o,h,s)&&a!=e)return h}return null},a.prototype.collision=function(t,e,i){return t.left-i<e.left+e.getWidth()&&t.left+t.getWidth()+i>e.left&&t.top-i<e.top+e.height&&t.top+t.height+i>e.top},h.prototype.setOptions=function(t){A.extend(this.options,t),null!==this.start&&null!==this.end&&this.setRange(this.start,this.end)},h.prototype.subscribe=function(t,e,i){function n(e){s._onMouseWheel(e,t,i)}var s=this;if("move"==e)t.on("dragstart",function(e){s._onDragStart(e,t)}),t.on("drag",function(e){s._onDrag(e,t,i)}),t.on("dragend",function(e){s._onDragEnd(e,t)});else{if("zoom"!=e)throw new TypeError('Unknown event "'+e+'". Choose "move" or "zoom".');t.on("mousewheel",n),t.on("DOMMouseScroll",n),t.on("touch",function(){s._onTouch()}),t.on("pinch",function(e){s._onPinch(e,t,i)})}},h.prototype.on=function(t,e){Y.addListener(this,t,e)},h.prototype._trigger=function(t){Y.trigger(this,t,{start:this.start,end:this.end})},h.prototype.setRange=function(t,e){var i=this._applyRange(t,e);i&&(this._trigger("rangechange"),this._trigger("rangechanged"))},h.prototype._applyRange=function(t,e){var i,n=null!=t?A.convert(t,"Number"):this.start,s=null!=e?A.convert(e,"Number"):this.end,r=null!=this.options.max?A.convert(this.options.max,"Date").valueOf():null,o=null!=this.options.min?A.convert(this.options.min,"Date").valueOf():null;if(isNaN(n)||null===n)throw new Error('Invalid start "'+t+'"');if(isNaN(s)||null===s)throw new Error('Invalid end "'+e+'"');if(n>s&&(s=n),null!==o&&o>n&&(i=o-n,n+=i,s+=i,null!=r&&s>r&&(s=r)),null!==r&&s>r&&(i=s-r,n-=i,s-=i,null!=o&&o>n&&(n=o)),null!==this.options.zoomMin){var a=parseFloat(this.options.zoomMin);0>a&&(a=0),a>s-n&&(this.end-this.start===a?(n=this.start,s=this.end):(i=a-(s-n),n-=i/2,s+=i/2))}if(null!==this.options.zoomMax){var h=parseFloat(this.options.zoomMax);0>h&&(h=0),s-n>h&&(this.end-this.start===h?(n=this.start,s=this.end):(i=s-n-h,n+=i/2,s-=i/2))}var d=this.start!=n||this.end!=s;return this.start=n,this.end=s,d},h.prototype.getRange=function(){return{start:this.start,end:this.end}},h.prototype.conversion=function(t){return h.conversion(this.start,this.end,t)},h.conversion=function(t,e,i){return 0!=i&&e-t!=0?{offset:t,scale:i/(e-t)}:{offset:0,scale:1}};var F={};h.prototype._onDragStart=function(t,e){if(!F.pinching){F.start=this.start,F.end=this.end;var i=e.frame;i&&(i.style.cursor="move")}},h.prototype._onDrag=function(t,e,i){if(d(i),!F.pinching){var n="horizontal"==i?t.gesture.deltaX:t.gesture.deltaY,s=F.end-F.start,r="horizontal"==i?e.width:e.height,o=-n/r*s;this._applyRange(F.start+o,F.end+o),this._trigger("rangechange")}},h.prototype._onDragEnd=function(t,e){F.pinching||(e.frame&&(e.frame.style.cursor="auto"),this._trigger("rangechanged"))},h.prototype._onMouseWheel=function(t,e,i){d(i);var n=0;if(t.wheelDelta?n=t.wheelDelta/120:t.detail&&(n=-t.detail/3),n){var s;s=0>n?1-n/5:1/(1+n/5);var r=A.fakeGesture(this,t),o=c(r.touches[0],e.frame),a=this._pointerToDate(e,i,o);this.zoom(s,a)}A.preventDefault(t)},h.prototype._onTouch=function(){F.start=this.start,F.end=this.end,F.pinching=!1,F.center=null},h.prototype._onPinch=function(t,e,i){if(F.pinching=!0,t.gesture.touches.length>1){F.center||(F.center=c(t.gesture.center,e.frame));var n=1/t.gesture.scale,s=this._pointerToDate(e,i,F.center),r=c(t.gesture.center,e.frame),o=(this._pointerToDate(e,i,r),parseInt(s+(F.start-s)*n)),a=parseInt(s+(F.end-s)*n);this.setRange(o,a)}},h.prototype._pointerToDate=function(t,e,i){var n;if("horizontal"==e){var s=t.width;return n=this.conversion(s),i.x/n.scale+n.offset}var r=t.height;return n=this.conversion(r),i.y/n.scale+n.offset},h.prototype.zoom=function(t,e){null==e&&(e=(this.start+this.end)/2);var i=e+(this.start-e)*t,n=e+(this.end-e)*t;this.setRange(i,n)},h.prototype.move=function(t){var e=this.end-this.start,i=this.start+e*t,n=this.end+e*t;this.start=i,this.end=n},h.prototype.moveTo=function(t){var e=(this.start+this.end)/2,i=e-t,n=this.start-i,s=this.end-i;this.setRange(n,s)},u.prototype.add=function(t){if(void 0==t.id)throw new Error("Component has no field id");if(!(t instanceof l||t instanceof u))throw new TypeError("Component must be an instance of prototype Component or Controller");t.controller=this,this.components[t.id]=t},u.prototype.remove=function(t){var e;for(e in this.components)if(this.components.hasOwnProperty(e)&&(e==t||this.components[e]==t))break;e&&delete this.components[e]},u.prototype.requestReflow=function(t){if(t)this.reflow();else if(!this.reflowTimer){var e=this;this.reflowTimer=setTimeout(function(){e.reflowTimer=void 0,e.reflow()},0)}},u.prototype.requestRepaint=function(t){if(t)this.repaint();else if(!this.repaintTimer){var e=this;this.repaintTimer=setTimeout(function(){e.repaintTimer=void 0,e.repaint()},0)}},u.prototype.repaint=function H(){function H(i,n){n in e||(i.depends&&i.depends.forEach(function(t){H(t,t.id)}),i.parent&&H(i.parent,i.parent.id),t=i.repaint()||t,e[n]=!0)}var t=!1;this.repaintTimer&&(clearTimeout(this.repaintTimer),this.repaintTimer=void 0);var e={};A.forEach(this.components,H),t&&this.reflow()},u.prototype.reflow=function z(){function z(i,n){n in e||(i.depends&&i.depends.forEach(function(t){z(t,t.id)}),i.parent&&z(i.parent,i.parent.id),t=i.reflow()||t,e[n]=!0)}var t=!1;this.reflowTimer&&(clearTimeout(this.reflowTimer),this.reflowTimer=void 0);var e={};A.forEach(this.components,z),t&&this.repaint()},l.prototype.setOptions=function(t){t&&(A.extend(this.options,t),this.controller&&(this.requestRepaint(),this.requestReflow()))},l.prototype.getOption=function(t){var e;return this.options&&(e=this.options[t]),void 0===e&&this.defaultOptions&&(e=this.defaultOptions[t]),e},l.prototype.getContainer=function(){return null},l.prototype.getFrame=function(){return this.frame},l.prototype.repaint=function(){return!1},l.prototype.reflow=function(){return!1},l.prototype.hide=function(){return this.frame&&this.frame.parentNode?(this.frame.parentNode.removeChild(this.frame),!0):!1},l.prototype.show=function(){return this.frame&&this.frame.parentNode?!1:this.repaint()},l.prototype.requestRepaint=function(){if(!this.controller)throw new Error("Cannot request a repaint: no controller configured");this.controller.requestRepaint()},l.prototype.requestReflow=function(){if(!this.controller)throw new Error("Cannot request a reflow: no controller configured");this.controller.requestReflow()},p.prototype=new l,p.prototype.setOptions=l.prototype.setOptions,p.prototype.getContainer=function(){return this.frame},p.prototype.repaint=function(){var t=0,e=A.updateProperty,i=A.option.asSize,n=this.options,s=this.frame;if(!s){s=document.createElement("div"),s.className="panel";var r=n.className;r&&("function"==typeof r?A.addClassName(s,String(r())):A.addClassName(s,String(r))),this.frame=s,t+=1}if(!s.parentNode){if(!this.parent)throw new Error("Cannot repaint panel: no parent attached");var o=this.parent.getContainer();if(!o)throw new Error("Cannot repaint panel: parent has no container element");o.appendChild(s),t+=1}return t+=e(s.style,"top",i(n.top,"0px")),t+=e(s.style,"left",i(n.left,"0px")),t+=e(s.style,"width",i(n.width,"100%")),t+=e(s.style,"height",i(n.height,"100%")),t>0},p.prototype.reflow=function(){var t=0,e=A.updateProperty,i=this.frame;return i?(t+=e(this,"top",i.offsetTop),t+=e(this,"left",i.offsetLeft),t+=e(this,"width",i.offsetWidth),t+=e(this,"height",i.offsetHeight)):t+=1,t>0},f.prototype=new p,f.prototype.setOptions=l.prototype.setOptions,f.prototype.repaint=function(){var t=0,e=A.updateProperty,i=A.option.asSize,n=this.options,s=this.frame;if(s||(s=document.createElement("div"),this.frame=s,t+=1),!s.parentNode){if(!this.container)throw new Error("Cannot repaint root panel: no container attached");this.container.appendChild(s),t+=1}s.className="vis timeline rootpanel "+n.orientation;var r=n.className;return r&&A.addClassName(s,A.option.asString(r)),t+=e(s.style,"top",i(n.top,"0px")),t+=e(s.style,"left",i(n.left,"0px")),t+=e(s.style,"width",i(n.width,"100%")),t+=e(s.style,"height",i(n.height,"100%")),this._updateEventEmitters(),this._updateWatch(),t>0},f.prototype.reflow=function(){var t=0,e=A.updateProperty,i=this.frame;return i?(t+=e(this,"top",i.offsetTop),t+=e(this,"left",i.offsetLeft),t+=e(this,"width",i.offsetWidth),t+=e(this,"height",i.offsetHeight)):t+=1,t>0},f.prototype._updateWatch=function(){var t=this.getOption("autoResize");t?this._watch():this._unwatch()},f.prototype._watch=function(){var t=this;this._unwatch();var e=function(){var e=t.getOption("autoResize");return e?(t.frame&&(t.frame.clientWidth!=t.width||t.frame.clientHeight!=t.height)&&t.requestReflow(),void 0):(t._unwatch(),void 0)};A.addEventListener(window,"resize",e),this.watchTimer=setInterval(e,1e3)},f.prototype._unwatch=function(){this.watchTimer&&(clearInterval(this.watchTimer),this.watchTimer=void 0)},f.prototype.on=function(t,e){var i=this.listeners[t];i||(i=[],this.listeners[t]=i),i.push(e),this._updateEventEmitters()},f.prototype._updateEventEmitters=function(){if(this.listeners){var t=this;A.forEach(this.listeners,function(e,i){if(t.emitters||(t.emitters={}),!(i in t.emitters)){var n=t.frame;if(n){var s=function(t){e.forEach(function(e){e(t)})};t.emitters[i]=s,t.hammer||(t.hammer=L(n,{prevent_default:!0})),t.hammer.on(i,s)}}})}},m.prototype=new l,m.prototype.setOptions=l.prototype.setOptions,m.prototype.setRange=function(t){if(!(t instanceof h||t&&t.start&&t.end))throw new TypeError("Range must be an instance of Range, or an object containing start and end.");this.range=t},m.prototype.toTime=function(t){var e=this.conversion;return new Date(t/e.scale+e.offset)},m.prototype.toScreen=function(t){var e=this.conversion;return(t.valueOf()-e.offset)*e.scale},m.prototype.repaint=function(){var t=0,e=A.updateProperty,i=A.option.asSize,n=this.options,s=this.getOption("orientation"),r=this.props,o=this.step,a=this.frame;if(a||(a=document.createElement("div"),this.frame=a,t+=1),a.className="axis",!a.parentNode){if(!this.parent)throw new Error("Cannot repaint time axis: no parent attached");var h=this.parent.getContainer();if(!h)throw new Error("Cannot repaint time axis: parent has no container element");h.appendChild(a),t+=1}var d=a.parentNode;if(d){var c=a.nextSibling;d.removeChild(a);var u="bottom"==s&&this.props.parentHeight&&this.height?this.props.parentHeight-this.height+"px":"0px";if(t+=e(a.style,"top",i(n.top,u)),t+=e(a.style,"left",i(n.left,"0px")),t+=e(a.style,"width",i(n.width,"100%")),t+=e(a.style,"height",i(n.height,this.height+"px")),this._repaintMeasureChars(),this.step){this._repaintStart(),o.first();for(var l=void 0,p=0;o.hasNext()&&1e3>p;){p++;var f=o.getCurrent(),m=this.toScreen(f),g=o.isMajor();this.getOption("showMinorLabels")&&this._repaintMinorText(m,o.getLabelMinor()),g&&this.getOption("showMajorLabels")?(m>0&&(void 0==l&&(l=m),this._repaintMajorText(m,o.getLabelMajor())),this._repaintMajorLine(m)):this._repaintMinorLine(m),o.next()}if(this.getOption("showMajorLabels")){var v=this.toTime(0),y=o.getLabelMajor(v),w=y.length*(r.majorCharWidth||10)+10;(void 0==l||l>w)&&this._repaintMajorText(0,y)}this._repaintEnd()}this._repaintLine(),c?d.insertBefore(a,c):d.appendChild(a)}return t>0},m.prototype._repaintStart=function(){var t=this.dom,e=t.redundant;e.majorLines=t.majorLines,e.majorTexts=t.majorTexts,e.minorLines=t.minorLines,e.minorTexts=t.minorTexts,t.majorLines=[],t.majorTexts=[],t.minorLines=[],t.minorTexts=[]},m.prototype._repaintEnd=function(){A.forEach(this.dom.redundant,function(t){for(;t.length;){var e=t.pop();e&&e.parentNode&&e.parentNode.removeChild(e)}})},m.prototype._repaintMinorText=function(t,e){var i=this.dom.redundant.minorTexts.shift();if(!i){var n=document.createTextNode("");i=document.createElement("div"),i.appendChild(n),i.className="text minor",this.frame.appendChild(i)}this.dom.minorTexts.push(i),i.childNodes[0].nodeValue=e,i.style.left=t+"px",i.style.top=this.props.minorLabelTop+"px"},m.prototype._repaintMajorText=function(t,e){var i=this.dom.redundant.majorTexts.shift();if(!i){var n=document.createTextNode(e);i=document.createElement("div"),i.className="text major",i.appendChild(n),this.frame.appendChild(i)}this.dom.majorTexts.push(i),i.childNodes[0].nodeValue=e,i.style.top=this.props.majorLabelTop+"px",i.style.left=t+"px"},m.prototype._repaintMinorLine=function(t){var e=this.dom.redundant.minorLines.shift();e||(e=document.createElement("div"),e.className="grid vertical minor",this.frame.appendChild(e)),this.dom.minorLines.push(e);var i=this.props;e.style.top=i.minorLineTop+"px",e.style.height=i.minorLineHeight+"px",e.style.left=t-i.minorLineWidth/2+"px"},m.prototype._repaintMajorLine=function(t){var e=this.dom.redundant.majorLines.shift();e||(e=document.createElement("DIV"),e.className="grid vertical major",this.frame.appendChild(e)),this.dom.majorLines.push(e);var i=this.props;e.style.top=i.majorLineTop+"px",e.style.left=t-i.majorLineWidth/2+"px",e.style.height=i.majorLineHeight+"px"},m.prototype._repaintLine=function(){{var t=this.dom.line,e=this.frame;this.options}this.getOption("showMinorLabels")||this.getOption("showMajorLabels")?(t?(e.removeChild(t),e.appendChild(t)):(t=document.createElement("div"),t.className="grid horizontal major",e.appendChild(t),this.dom.line=t),t.style.top=this.props.lineTop+"px"):t&&t.parentElement&&(e.removeChild(t.line),delete this.dom.line)},m.prototype._repaintMeasureChars=function(){var t,e=this.dom;if(!e.measureCharMinor){t=document.createTextNode("0");var i=document.createElement("DIV");i.className="text minor measure",i.appendChild(t),this.frame.appendChild(i),e.measureCharMinor=i}if(!e.measureCharMajor){t=document.createTextNode("0");var n=document.createElement("DIV");n.className="text major measure",n.appendChild(t),this.frame.appendChild(n),e.measureCharMajor=n}},m.prototype.reflow=function(){var t=0,e=A.updateProperty,i=this.frame,n=this.range;if(!n)throw new Error("Cannot repaint time axis: no range configured");if(i){t+=e(this,"top",i.offsetTop),t+=e(this,"left",i.offsetLeft);var s=this.props,r=this.getOption("showMinorLabels"),o=this.getOption("showMajorLabels"),a=this.dom.measureCharMinor,h=this.dom.measureCharMajor;a&&(s.minorCharHeight=a.clientHeight,s.minorCharWidth=a.clientWidth),h&&(s.majorCharHeight=h.clientHeight,s.majorCharWidth=h.clientWidth);var d=i.parentNode?i.parentNode.offsetHeight:0;switch(d!=s.parentHeight&&(s.parentHeight=d,t+=1),this.getOption("orientation")){case"bottom":s.minorLabelHeight=r?s.minorCharHeight:0,s.majorLabelHeight=o?s.majorCharHeight:0,s.minorLabelTop=0,s.majorLabelTop=s.minorLabelTop+s.minorLabelHeight,s.minorLineTop=-this.top,s.minorLineHeight=Math.max(this.top+s.majorLabelHeight,0),s.minorLineWidth=1,s.majorLineTop=-this.top,s.majorLineHeight=Math.max(this.top+s.minorLabelHeight+s.majorLabelHeight,0),s.majorLineWidth=1,s.lineTop=0;break;case"top":s.minorLabelHeight=r?s.minorCharHeight:0,s.majorLabelHeight=o?s.majorCharHeight:0,s.majorLabelTop=0,s.minorLabelTop=s.majorLabelTop+s.majorLabelHeight,s.minorLineTop=s.minorLabelTop,s.minorLineHeight=Math.max(d-s.majorLabelHeight-this.top),s.minorLineWidth=1,s.majorLineTop=0,s.majorLineHeight=Math.max(d-this.top),s.majorLineWidth=1,s.lineTop=s.majorLabelHeight+s.minorLabelHeight;break;default:throw new Error('Unkown orientation "'+this.getOption("orientation")+'"')}var c=s.minorLabelHeight+s.majorLabelHeight;t+=e(this,"width",i.offsetWidth),t+=e(this,"height",c),this._updateConversion();var u=A.convert(n.start,"Number"),l=A.convert(n.end,"Number"),p=this.toTime(5*(s.minorCharWidth||10)).valueOf()-this.toTime(0).valueOf();this.step=new TimeStep(new Date(u),new Date(l),p),t+=e(s.range,"start",u),t+=e(s.range,"end",l),t+=e(s.range,"minimumStep",p.valueOf())}return t>0},m.prototype._updateConversion=function(){var t=this.range;if(!t)throw new Error("No range configured");this.conversion=t.conversion?t.conversion(this.width):h.conversion(t.start,t.end,this.width)},g.prototype=new l,g.prototype.setOptions=l.prototype.setOptions,g.prototype.getContainer=function(){return this.frame},g.prototype.repaint=function(){var t=this.frame,e=this.parent,i=e.parent.getContainer();if(!e)throw new Error("Cannot repaint bar: no parent attached");if(!i)throw new Error("Cannot repaint bar: parent has no container element");if(!this.getOption("showCurrentTime"))return t&&(i.removeChild(t),delete this.frame),void 0;t||(t=document.createElement("div"),t.className="currenttime",t.style.position="absolute",t.style.top="0px",t.style.height="100%",i.appendChild(t),this.frame=t),e.conversion||e._updateConversion();var n=new Date,s=e.toScreen(n);t.style.left=s+"px",t.title="Current time: "+n,void 0!==this.currentTimeTimer&&(clearTimeout(this.currentTimeTimer),delete this.currentTimeTimer);var r=this,o=1/e.conversion.scale/2;return 30>o&&(o=30),this.currentTimeTimer=setTimeout(function(){r.repaint()},o),!1},v.prototype=new l,v.prototype.setOptions=l.prototype.setOptions,v.prototype.getContainer=function(){return this.frame},v.prototype.repaint=function(){var t=this.frame,e=this.parent,i=e.parent.getContainer();if(!e)throw new Error("Cannot repaint bar: no parent attached");if(!i)throw new Error("Cannot repaint bar: parent has no container element");if(!this.getOption("showCustomTime"))return t&&(i.removeChild(t),delete this.frame),void 0;if(!t){t=document.createElement("div"),t.className="customtime",t.style.position="absolute",t.style.top="0px",t.style.height="100%",i.appendChild(t);var n=document.createElement("div");n.style.position="relative",n.style.top="0px",n.style.left="-10px",n.style.height="100%",n.style.width="20px",t.appendChild(n),this.frame=t,this.subscribe(this,"movetime")}e.conversion||e._updateConversion();var s=e.toScreen(this.customTime);return t.style.left=s+"px",t.title="Time: "+this.customTime,!1},v.prototype._setCustomTime=function(t){this.customTime=new Date(t.valueOf()),this.repaint()},v.prototype._getCustomTime=function(){return new Date(this.customTime.valueOf())},v.prototype.subscribe=function(t,e){var i=this,n={component:t,event:e,callback:function(t){i._onMouseDown(t,n)},params:{}};t.on("mousedown",n.callback),i.listeners.push(n)},v.prototype.on=function(t,e){var i=this.frame;if(!i)throw new Error("Cannot add event listener: no parent attached");Y.addListener(this,t,e),A.addEventListener(i,t,e)},v.prototype._onMouseDown=function(t,e){t=t||window.event;var i=e.params,n=t.which?1==t.which:1==t.button;if(n){i.mouseX=A.getPageX(t),i.moved=!1,i.customTime=this.customTime;var s=this;i.onMouseMove||(i.onMouseMove=function(t){s._onMouseMove(t,e)},A.addEventListener(document,"mousemove",i.onMouseMove)),i.onMouseUp||(i.onMouseUp=function(t){s._onMouseUp(t,e)},A.addEventListener(document,"mouseup",i.onMouseUp)),A.stopPropagation(t),A.preventDefault(t)}},v.prototype._onMouseMove=function(t,e){t=t||window.event;var i=e.params,n=this.parent,s=A.getPageX(t);void 0===i.mouseX&&(i.mouseX=s);var r=s-i.mouseX;Math.abs(r)>=1&&(i.moved=!0);var o=n.toScreen(i.customTime),a=o+r,h=n.toTime(a);this._setCustomTime(h),Y.trigger(this,"timechange",{customTime:this.customTime}),A.preventDefault(t)},v.prototype._onMouseUp=function(t,e){t=t||window.event;var i=e.params;i.onMouseMove&&(A.removeEventListener(document,"mousemove",i.onMouseMove),i.onMouseMove=null),i.onMouseUp&&(A.removeEventListener(document,"mouseup",i.onMouseUp),i.onMouseUp=null),i.moved&&Y.trigger(this,"timechanged",{customTime:this.customTime})},y.prototype=new p,y.types={box:_,range:E,rangeoverflow:T,point:b},y.prototype.setOptions=l.prototype.setOptions,y.prototype.setRange=function(t){if(!(t instanceof h||t&&t.start&&t.end))throw new TypeError("Range must be an instance of Range, or an object containing start and end.");this.range=t},y.prototype.repaint=function(){var t=0,e=A.updateProperty,i=A.option.asSize,n=this.options,s=this.getOption("orientation"),r=this.defaultOptions,o=this.frame;if(!o){o=document.createElement("div"),o.className="itemset";var a=n.className;a&&A.addClassName(o,A.option.asString(a));var h=document.createElement("div");h.className="background",o.appendChild(h),this.dom.background=h;var d=document.createElement("div");d.className="foreground",o.appendChild(d),this.dom.foreground=d;var c=document.createElement("div");c.className="itemset-axis",this.dom.axis=c,this.frame=o,t+=1}if(!this.parent)throw new Error("Cannot repaint itemset: no parent attached");var u=this.parent.getContainer();if(!u)throw new Error("Cannot repaint itemset: parent has no container element");o.parentNode||(u.appendChild(o),t+=1),this.dom.axis.parentNode||(u.appendChild(this.dom.axis),t+=1),t+=e(o.style,"left",i(n.left,"0px")),t+=e(o.style,"top",i(n.top,"0px")),t+=e(o.style,"width",i(n.width,"100%")),t+=e(o.style,"height",i(n.height,this.height+"px")),t+=e(this.dom.axis.style,"left",i(n.left,"0px")),t+=e(this.dom.axis.style,"width",i(n.width,"100%")),t+="bottom"==s?e(this.dom.axis.style,"top",this.height+this.top+"px"):e(this.dom.axis.style,"top",this.top+"px"),this._updateConversion();var l=this,p=this.queue,f=this.itemsData,m=this.items,g={};return Object.keys(p).forEach(function(e){var i=p[e],s=m[e];switch(i){case"add":case"update":var o=f&&f.get(e,g);if(o){var a=o.type||o.start&&o.end&&"range"||n.type||"box",h=y.types[a];if(s&&(h&&s instanceof h?(s.data=o,t++):(t+=s.hide(),s=null)),!s){if(!h)throw new TypeError('Unknown item type "'+a+'"');s=new h(l,o,n,r),t++}s.repaint(),m[e]=s}delete p[e];break;case"remove":s&&(t+=s.hide()),delete m[e],delete p[e];break;default:console.log('Error: unknown action "'+i+'"')}}),A.forEach(this.items,function(e){e.visible?(t+=e.show(),e.reposition()):t+=e.hide()}),t>0},y.prototype.getForeground=function(){return this.dom.foreground},y.prototype.getBackground=function(){return this.dom.background},y.prototype.getAxis=function(){return this.dom.axis},y.prototype.reflow=function(){var t=0,e=this.options,i=e.margin&&e.margin.axis||this.defaultOptions.margin.axis,n=e.margin&&e.margin.item||this.defaultOptions.margin.item,s=A.updateProperty,r=A.option.asNumber,o=A.option.asSize,a=this.frame;if(a){this._updateConversion(),A.forEach(this.items,function(e){t+=e.reflow()}),this.stack.update();var h,d=r(e.maxHeight),c=null!=o(e.height);if(c)h=a.offsetHeight;else{var u=this.stack.ordered;if(u.length){var l=u[0].top,p=u[0].top+u[0].height;A.forEach(u,function(t){l=Math.min(l,t.top),p=Math.max(p,t.top+t.height)}),h=p-l+i+n}else h=i+n}null!=d&&(h=Math.min(h,d)),t+=s(this,"height",h),t+=s(this,"top",a.offsetTop),t+=s(this,"left",a.offsetLeft),t+=s(this,"width",a.offsetWidth)}else t+=1;return t>0},y.prototype.hide=function(){var t=!1;return this.frame&&this.frame.parentNode&&(this.frame.parentNode.removeChild(this.frame),t=!0),this.dom.axis&&this.dom.axis.parentNode&&(this.dom.axis.parentNode.removeChild(this.dom.axis),t=!0),t},y.prototype.setItems=function(t){var e,i=this,n=this.itemsData;if(t){if(!(t instanceof r||t instanceof o))throw new TypeError("Data must be an instance of DataSet");this.itemsData=t}else this.itemsData=null;if(n&&(A.forEach(this.listeners,function(t,e){n.unsubscribe(e,t)}),e=n.getIds(),this._onRemove(e)),this.itemsData){var s=this.id;A.forEach(this.listeners,function(t,e){i.itemsData.subscribe(e,t,s)}),e=this.itemsData.getIds(),this._onAdd(e)}},y.prototype.getItems=function(){return this.itemsData},y.prototype._onUpdate=function(t){this._toQueue("update",t)},y.prototype._onAdd=function(t){this._toQueue("add",t)},y.prototype._onRemove=function(t){this._toQueue("remove",t)},y.prototype._toQueue=function(t,e){var i=this.queue;e.forEach(function(e){i[e]=t}),this.controller&&this.requestRepaint()},y.prototype._updateConversion=function(){var t=this.range;if(!t)throw new Error("No range configured");this.conversion=t.conversion?t.conversion(this.width):h.conversion(t.start,t.end,this.width)},y.prototype.toTime=function(t){var e=this.conversion;return new Date(t/e.scale+e.offset)},y.prototype.toScreen=function(t){var e=this.conversion;return(t.valueOf()-e.offset)*e.scale},w.prototype.select=function(){this.selected=!0},w.prototype.unselect=function(){this.selected=!1},w.prototype.show=function(){return!1},w.prototype.hide=function(){return!1},w.prototype.repaint=function(){return!1},w.prototype.reflow=function(){return!1},w.prototype.getWidth=function(){return this.width},_.prototype=new w(null,null),_.prototype.select=function(){this.selected=!0},_.prototype.unselect=function(){this.selected=!1},_.prototype.repaint=function(){var t=!1,e=this.dom;if(e||(this._create(),e=this.dom,t=!0),e){if(!this.parent)throw new Error("Cannot repaint item: no parent attached");if(!e.box.parentNode){var i=this.parent.getForeground();if(!i)throw new Error("Cannot repaint time axis: parent has no foreground container element");i.appendChild(e.box),t=!0}if(!e.line.parentNode){var n=this.parent.getBackground();if(!n)throw new Error("Cannot repaint time axis: parent has no background container element");n.appendChild(e.line),t=!0}if(!e.dot.parentNode){var s=this.parent.getAxis();if(!n)throw new Error("Cannot repaint time axis: parent has no axis container element");s.appendChild(e.dot),t=!0}if(this.data.content!=this.content){if(this.content=this.data.content,this.content instanceof Element)e.content.innerHTML="",e.content.appendChild(this.content);else{if(void 0==this.data.content)throw new Error('Property "content" missing in item '+this.data.id);e.content.innerHTML=this.content}t=!0}var r=(this.data.className?" "+this.data.className:"")+(this.selected?" selected":"");this.className!=r&&(this.className=r,e.box.className="item box"+r,e.line.className="item line"+r,e.dot.className="item dot"+r,t=!0)}return t},_.prototype.show=function(){return this.dom&&this.dom.box.parentNode?!1:this.repaint()
+},_.prototype.hide=function(){var t=!1,e=this.dom;return e&&(e.box.parentNode&&(e.box.parentNode.removeChild(e.box),t=!0),e.line.parentNode&&e.line.parentNode.removeChild(e.line),e.dot.parentNode&&e.dot.parentNode.removeChild(e.dot)),t},_.prototype.reflow=function(){var t,e,i,n,s,r,o,a,h,d,c,u,l=0;if(void 0==this.data.start)throw new Error('Property "start" missing in item '+this.data.id);if(c=this.data,u=this.parent&&this.parent.range,c&&u){var p=u.end-u.start;this.visible=c.start>u.start-p&&c.start<u.end+p}else this.visible=!1;if(this.visible)if(e=this.dom)if(t=A.updateProperty,i=this.props,n=this.options,r=this.parent.toScreen(this.data.start),o=n.align||this.defaultOptions.align,s=n.margin&&n.margin.axis||this.defaultOptions.margin.axis,a=n.orientation||this.defaultOptions.orientation,l+=t(i.dot,"height",e.dot.offsetHeight),l+=t(i.dot,"width",e.dot.offsetWidth),l+=t(i.line,"width",e.line.offsetWidth),l+=t(i.line,"height",e.line.offsetHeight),l+=t(i.line,"top",e.line.offsetTop),l+=t(this,"width",e.box.offsetWidth),l+=t(this,"height",e.box.offsetHeight),d="right"==o?r-this.width:"left"==o?r:r-this.width/2,l+=t(this,"left",d),l+=t(i.line,"left",r-i.line.width/2),l+=t(i.dot,"left",r-i.dot.width/2),l+=t(i.dot,"top",-i.dot.height/2),"top"==a)h=s,l+=t(this,"top",h);else{var f=this.parent.height;h=f-this.height-s,l+=t(this,"top",h)}else l+=1;return l>0},_.prototype._create=function(){var t=this.dom;t||(this.dom=t={},t.box=document.createElement("DIV"),t.content=document.createElement("DIV"),t.content.className="content",t.box.appendChild(t.content),t.line=document.createElement("DIV"),t.line.className="line",t.dot=document.createElement("DIV"),t.dot.className="dot")},_.prototype.reposition=function(){var t=this.dom,e=this.props,i=this.options.orientation||this.defaultOptions.orientation;if(t){var n=t.box,s=t.line,r=t.dot;n.style.left=this.left+"px",n.style.top=this.top+"px",s.style.left=e.line.left+"px","top"==i?(s.style.top="0px",s.style.height=this.top+"px"):(s.style.top=this.top+this.height+"px",s.style.height=Math.max(this.parent.height-this.top-this.height+this.props.dot.height/2,0)+"px"),r.style.left=e.dot.left+"px",r.style.top=e.dot.top+"px"}},b.prototype=new w(null,null),b.prototype.select=function(){this.selected=!0},b.prototype.unselect=function(){this.selected=!1},b.prototype.repaint=function(){var t=!1,e=this.dom;if(e||(this._create(),e=this.dom,t=!0),e){if(!this.parent)throw new Error("Cannot repaint item: no parent attached");var i=this.parent.getForeground();if(!i)throw new Error("Cannot repaint time axis: parent has no foreground container element");if(e.point.parentNode||(i.appendChild(e.point),i.appendChild(e.point),t=!0),this.data.content!=this.content){if(this.content=this.data.content,this.content instanceof Element)e.content.innerHTML="",e.content.appendChild(this.content);else{if(void 0==this.data.content)throw new Error('Property "content" missing in item '+this.data.id);e.content.innerHTML=this.content}t=!0}var n=(this.data.className?" "+this.data.className:"")+(this.selected?" selected":"");this.className!=n&&(this.className=n,e.point.className="item point"+n,t=!0)}return t},b.prototype.show=function(){return this.dom&&this.dom.point.parentNode?!1:this.repaint()},b.prototype.hide=function(){var t=!1,e=this.dom;return e&&e.point.parentNode&&(e.point.parentNode.removeChild(e.point),t=!0),t},b.prototype.reflow=function(){var t,e,i,n,s,r,o,a,h,d,c=0;if(void 0==this.data.start)throw new Error('Property "start" missing in item '+this.data.id);if(h=this.data,d=this.parent&&this.parent.range,h&&d){var u=d.end-d.start;this.visible=h.start>d.start-u&&h.start<d.end}else this.visible=!1;if(this.visible)if(e=this.dom){if(t=A.updateProperty,i=this.props,n=this.options,r=n.orientation||this.defaultOptions.orientation,s=n.margin&&n.margin.axis||this.defaultOptions.margin.axis,o=this.parent.toScreen(this.data.start),c+=t(this,"width",e.point.offsetWidth),c+=t(this,"height",e.point.offsetHeight),c+=t(i.dot,"width",e.dot.offsetWidth),c+=t(i.dot,"height",e.dot.offsetHeight),c+=t(i.content,"height",e.content.offsetHeight),"top"==r)a=s;else{var l=this.parent.height;a=Math.max(l-this.height-s,0)}c+=t(this,"top",a),c+=t(this,"left",o-i.dot.width/2),c+=t(i.content,"marginLeft",1.5*i.dot.width),c+=t(i.dot,"top",(this.height-i.dot.height)/2)}else c+=1;return c>0},b.prototype._create=function(){var t=this.dom;t||(this.dom=t={},t.point=document.createElement("div"),t.content=document.createElement("div"),t.content.className="content",t.point.appendChild(t.content),t.dot=document.createElement("div"),t.dot.className="dot",t.point.appendChild(t.dot))},b.prototype.reposition=function(){var t=this.dom,e=this.props;t&&(t.point.style.top=this.top+"px",t.point.style.left=this.left+"px",t.content.style.marginLeft=e.content.marginLeft+"px",t.dot.style.top=e.dot.top+"px")},E.prototype=new w(null,null),E.prototype.select=function(){this.selected=!0},E.prototype.unselect=function(){this.selected=!1},E.prototype.repaint=function(){var t=!1,e=this.dom;if(e||(this._create(),e=this.dom,t=!0),e){if(!this.parent)throw new Error("Cannot repaint item: no parent attached");var i=this.parent.getForeground();if(!i)throw new Error("Cannot repaint time axis: parent has no foreground container element");if(e.box.parentNode||(i.appendChild(e.box),t=!0),this.data.content!=this.content){if(this.content=this.data.content,this.content instanceof Element)e.content.innerHTML="",e.content.appendChild(this.content);else{if(void 0==this.data.content)throw new Error('Property "content" missing in item '+this.data.id);e.content.innerHTML=this.content}t=!0}var n=this.data.className?" "+this.data.className:"";this.className!=n&&(this.className=n,e.box.className="item range"+n,t=!0)}return t},E.prototype.show=function(){return this.dom&&this.dom.box.parentNode?!1:this.repaint()},E.prototype.hide=function(){var t=!1,e=this.dom;return e&&e.box.parentNode&&(e.box.parentNode.removeChild(e.box),t=!0),t},E.prototype.reflow=function(){var t,e,i,n,s,r,o,a,h,d,c,u,l,p,f,m,g=0;if(void 0==this.data.start)throw new Error('Property "start" missing in item '+this.data.id);if(void 0==this.data.end)throw new Error('Property "end" missing in item '+this.data.id);return h=this.data,d=this.parent&&this.parent.range,this.visible=h&&d?h.start<d.end&&h.end>d.start:!1,this.visible&&(t=this.dom,t?(e=this.props,i=this.options,r=this.parent,o=r.toScreen(this.data.start),a=r.toScreen(this.data.end),c=A.updateProperty,u=t.box,l=r.width,f=i.orientation||this.defaultOptions.orientation,n=i.margin&&i.margin.axis||this.defaultOptions.margin.axis,s=i.padding||this.defaultOptions.padding,g+=c(e.content,"width",t.content.offsetWidth),g+=c(this,"height",u.offsetHeight),-l>o&&(o=-l),a>2*l&&(a=2*l),p=0>o?Math.min(-o,a-o-e.content.width-2*s):0,g+=c(e.content,"left",p),"top"==f?(m=n,g+=c(this,"top",m)):(m=r.height-this.height-n,g+=c(this,"top",m)),g+=c(this,"left",o),g+=c(this,"width",Math.max(a-o,1))):g+=1),g>0},E.prototype._create=function(){var t=this.dom;t||(this.dom=t={},t.box=document.createElement("div"),t.content=document.createElement("div"),t.content.className="content",t.box.appendChild(t.content))},E.prototype.reposition=function(){var t=this.dom,e=this.props;t&&(t.box.style.top=this.top+"px",t.box.style.left=this.left+"px",t.box.style.width=this.width+"px",t.content.style.left=e.content.left+"px")},T.prototype=new E(null,null),T.prototype.repaint=function(){var t=!1,e=this.dom;if(e||(this._create(),e=this.dom,t=!0),e){if(!this.parent)throw new Error("Cannot repaint item: no parent attached");var i=this.parent.getForeground();if(!i)throw new Error("Cannot repaint time axis: parent has no foreground container element");if(e.box.parentNode||(i.appendChild(e.box),t=!0),this.data.content!=this.content){if(this.content=this.data.content,this.content instanceof Element)e.content.innerHTML="",e.content.appendChild(this.content);else{if(void 0==this.data.content)throw new Error('Property "content" missing in item '+this.data.id);e.content.innerHTML=this.content}t=!0}var n=this.data.className?" "+this.data.className:"";this.className!=n&&(this.className=n,e.box.className="item rangeoverflow"+n,t=!0)}return t},T.prototype.getWidth=function(){return void 0!==this.props.content&&this.width<this.props.content.width?this.props.content.width:this.width},S.prototype=new l,S.prototype.setOptions=l.prototype.setOptions,S.prototype.getContainer=function(){return this.parent.getContainer()},S.prototype.setItems=function(t){if(this.itemset&&(this.itemset.hide(),this.itemset.setItems(),this.parent.controller.remove(this.itemset),this.itemset=null),t){var e=this.groupId,i=Object.create(this.options);this.itemset=new y(this,null,i),this.itemset.setRange(this.parent.range),this.view=new o(t,{filter:function(t){return t.group==e}}),this.itemset.setItems(this.view),this.parent.controller.add(this.itemset)}},S.prototype.repaint=function(){return!1},S.prototype.reflow=function(){var t=0,e=A.updateProperty;if(t+=e(this,"top",this.itemset?this.itemset.top:0),t+=e(this,"height",this.itemset?this.itemset.height:0),this.label){var i=this.label.firstChild;t+=e(this.props.label,"width",i.clientWidth),t+=e(this.props.label,"height",i.clientHeight)}else t+=e(this.props.label,"width",0),t+=e(this.props.label,"height",0);return t>0},x.prototype=new p,x.prototype.setOptions=l.prototype.setOptions,x.prototype.setRange=function(){},x.prototype.setItems=function(t){this.itemsData=t;for(var e in this.groups)if(this.groups.hasOwnProperty(e)){var i=this.groups[e];i.setItems(t)}},x.prototype.getItems=function(){return this.itemsData},x.prototype.setRange=function(t){this.range=t},x.prototype.setGroups=function(t){var e,i=this;if(this.groupsData&&(A.forEach(this.listeners,function(t,e){i.groupsData.unsubscribe(e,t)}),e=this.groupsData.getIds(),this._onRemove(e)),t?t instanceof r?this.groupsData=t:(this.groupsData=new r({convert:{start:"Date",end:"Date"}}),this.groupsData.add(t)):this.groupsData=null,this.groupsData){var n=this.id;A.forEach(this.listeners,function(t,e){i.groupsData.subscribe(e,t,n)}),e=this.groupsData.getIds(),this._onAdd(e)}},x.prototype.getGroups=function(){return this.groupsData},x.prototype.repaint=function(){var t,e,i,n,s=0,r=A.updateProperty,o=A.option.asSize,a=A.option.asElement,h=this.options,d=this.dom.frame,c=this.dom.labels,u=this.dom.labelSet;if(!this.parent)throw new Error("Cannot repaint groupset: no parent attached");var l=this.parent.getContainer();if(!l)throw new Error("Cannot repaint groupset: parent has no container element");if(!d){d=document.createElement("div"),d.className="groupset",this.dom.frame=d;var p=h.className;p&&A.addClassName(d,A.option.asString(p)),s+=1}d.parentNode||(l.appendChild(d),s+=1);var f=a(h.labelContainer);if(!f)throw new Error('Cannot repaint groupset: option "labelContainer" not defined');c||(c=document.createElement("div"),c.className="labels",this.dom.labels=c),u||(u=document.createElement("div"),u.className="label-set",c.appendChild(u),this.dom.labelSet=u),c.parentNode&&c.parentNode==f||(c.parentNode&&c.parentNode.removeChild(c.parentNode),f.appendChild(c)),s+=r(d.style,"height",o(h.height,this.height+"px")),s+=r(d.style,"top",o(h.top,"0px")),s+=r(d.style,"left",o(h.left,"0px")),s+=r(d.style,"width",o(h.width,"100%")),s+=r(u.style,"top",o(h.top,"0px")),s+=r(u.style,"height",o(h.height,this.height+"px"));var m=this,g=this.queue,v=this.groups,y=this.groupsData,w=Object.keys(g);if(w.length){w.forEach(function(t){var e=g[t],i=v[t];switch(e){case"add":case"update":if(!i){var n=Object.create(m.options);A.extend(n,{height:null,maxHeight:null}),i=new S(m,t,n),i.setItems(m.itemsData),v[t]=i,m.controller.add(i)}i.data=y.get(t),delete g[t];break;case"remove":i&&(i.setItems(),delete v[t],m.controller.remove(i)),delete g[t];break;default:console.log('Error: unknown action "'+e+'"')}});var _=this.groupsData.getIds({order:this.options.groupOrder});for(t=0;t<_.length;t++)!function(t,e){var i=0;e&&(i=function(){return e.top+e.height}),t.setOptions({top:i})}(v[_[t]],v[_[t-1]]);for(;u.firstChild;)u.removeChild(u.firstChild);for(t=0;t<_.length;t++)e=_[t],n=this._createLabel(e),u.appendChild(n);s++}for(e in v)v.hasOwnProperty(e)&&(i=v[e],n=i.label,n&&(n.style.top=i.top+"px",n.style.height=i.height+"px"));return s>0},x.prototype._createLabel=function(t){var e=this.groups[t],i=document.createElement("div");i.className="label";var n=document.createElement("div");n.className="inner",i.appendChild(n);var s=e.data&&e.data.content;s instanceof Element?n.appendChild(s):void 0!=s&&(n.innerHTML=s);var r=e.data&&e.data.className;return r&&A.addClassName(i,r),e.label=i,i},x.prototype.getContainer=function(){return this.dom.frame},x.prototype.getLabelsWidth=function(){return this.props.labels.width},x.prototype.reflow=function(){var t,e,i=0,n=this.options,s=A.updateProperty,r=A.option.asNumber,o=A.option.asSize,a=this.dom.frame;if(a){var h,d=r(n.maxHeight),c=null!=o(n.height);if(c)h=a.offsetHeight;else{h=0;for(t in this.groups)this.groups.hasOwnProperty(t)&&(e=this.groups[t],h+=e.height)}null!=d&&(h=Math.min(h,d)),i+=s(this,"height",h),i+=s(this,"top",a.offsetTop),i+=s(this,"left",a.offsetLeft),i+=s(this,"width",a.offsetWidth)}var u=0;for(t in this.groups)if(this.groups.hasOwnProperty(t)){e=this.groups[t];var l=e.props&&e.props.label&&e.props.label.width||0;u=Math.max(u,l)}return i+=s(this.props.labels,"width",u),i>0},x.prototype.hide=function(){return this.dom.frame&&this.dom.frame.parentNode?(this.dom.frame.parentNode.removeChild(this.dom.frame),!0):!1},x.prototype.show=function(){return this.dom.frame&&this.dom.frame.parentNode?!1:this.repaint()},x.prototype._onUpdate=function(t){this._toQueue(t,"update")},x.prototype._onAdd=function(t){this._toQueue(t,"add")},x.prototype._onRemove=function(t){this._toQueue(t,"remove")},x.prototype._toQueue=function(t,e){var i=this.queue;t.forEach(function(t){i[t]=e}),this.controller&&this.requestRepaint()},D.prototype.setOptions=function(t){A.extend(this.options,t),this.range.setRange(),this.controller.reflow(),this.controller.repaint()},D.prototype.setCustomTime=function(t){this.customtime._setCustomTime(t)},D.prototype.getCustomTime=function(){return new Date(this.customtime.customTime.valueOf())},D.prototype.setItems=function(t){var e,i=null==this.itemsData;if(t?t instanceof r&&(e=t):e=null,t instanceof r||(e=new r({convert:{start:"Date",end:"Date"}}),e.add(t)),this.itemsData=e,this.content.setItems(e),i&&(void 0==this.options.start||void 0==this.options.end)){var n=this.getItemRange(),s=n.min,o=n.max;if(null!=s&&null!=o){var a=o.valueOf()-s.valueOf();0>=a&&(a=864e5),s=new Date(s.valueOf()-.05*a),o=new Date(o.valueOf()+.05*a)}void 0!=this.options.start&&(s=A.convert(this.options.start,"Date")),void 0!=this.options.end&&(o=A.convert(this.options.end,"Date")),(null!=s||null!=o)&&this.range.setRange(s,o)}},D.prototype.setGroups=function(t){var e=this;this.groupsData=t;var i=this.groupsData?x:y;if(!(this.content instanceof i)){this.content&&(this.content.hide(),this.content.setItems&&this.content.setItems(),this.content.setGroups&&this.content.setGroups(),this.controller.remove(this.content));var n=Object.create(this.options);A.extend(n,{top:function(){return"top"==e.options.orientation?e.timeaxis.height:e.itemPanel.height-e.timeaxis.height-e.content.height},left:null,width:"100%",height:function(){return e.options.height?e.itemPanel.height-e.timeaxis.height:null},maxHeight:function(){if(e.options.maxHeight){if(!A.isNumber(e.options.maxHeight))throw new TypeError("Number expected for property maxHeight");return e.options.maxHeight-e.timeaxis.height}return null},labelContainer:function(){return e.labelPanel.getContainer()}}),this.content=new i(this.itemPanel,[this.timeaxis],n),this.content.setRange&&this.content.setRange(this.range),this.content.setItems&&this.content.setItems(this.itemsData),this.content.setGroups&&this.content.setGroups(this.groupsData),this.controller.add(this.content)}},D.prototype.getItemRange=function(){var t=this.itemsData,e=null,i=null;if(t){var n=t.min("start");e=n?n.start.valueOf():null;var s=t.max("start");s&&(i=s.start.valueOf());var r=t.max("end");r&&(i=null==i?r.end.valueOf():Math.max(i,r.end.valueOf()))}return{min:null!=e?new Date(e):null,max:null!=i?new Date(i):null}},function(t){function e(t){return D=t,l()}function i(){M=0,C=D.charAt(0)}function n(){M++,C=D.charAt(M)}function s(){return D.charAt(M+1)}function r(t){return L.test(t)}function o(t,e){if(t||(t={}),e)for(var i in e)e.hasOwnProperty(i)&&(t[i]=e[i]);return t}function a(t,e,i){for(var n=e.split("."),s=t;n.length;){var r=n.shift();n.length?(s[r]||(s[r]={}),s=s[r]):s[r]=i}}function h(t,e){for(var i,n,s=null,r=[t],a=t;a.parent;)r.push(a.parent),a=a.parent;if(a.nodes)for(i=0,n=a.nodes.length;n>i;i++)if(e.id===a.nodes[i].id){s=a.nodes[i];break}for(s||(s={id:e.id},t.node&&(s.attr=o(s.attr,t.node))),i=r.length-1;i>=0;i--){var h=r[i];h.nodes||(h.nodes=[]),-1==h.nodes.indexOf(s)&&h.nodes.push(s)}e.attr&&(s.attr=o(s.attr,e.attr))}function d(t,e){if(t.edges||(t.edges=[]),t.edges.push(e),t.edge){var i=o({},t.edge);e.attr=o(i,e.attr)}}function c(t,e,i,n,s){var r={from:e,to:i,type:n};return t.edge&&(r.attr=o({},t.edge)),r.attr=o(r.attr||{},s),r}function u(){for(N=S.NULL,O="";" "==C||"	"==C||"\n"==C||"\r"==C;)n();do{var t=!1;if("#"==C){for(var e=M-1;" "==D.charAt(e)||"	"==D.charAt(e);)e--;if("\n"==D.charAt(e)||""==D.charAt(e)){for(;""!=C&&"\n"!=C;)n();t=!0}}if("/"==C&&"/"==s()){for(;""!=C&&"\n"!=C;)n();t=!0}if("/"==C&&"*"==s()){for(;""!=C;){if("*"==C&&"/"==s()){n(),n();break}n()}t=!0}for(;" "==C||"	"==C||"\n"==C||"\r"==C;)n()}while(t);if(""==C)return N=S.DELIMITER,void 0;var i=C+s();if(x[i])return N=S.DELIMITER,O=i,n(),n(),void 0;if(x[C])return N=S.DELIMITER,O=C,n(),void 0;if(r(C)||"-"==C){for(O+=C,n();r(C);)O+=C,n();return"false"==O?O=!1:"true"==O?O=!0:isNaN(Number(O))||(O=Number(O)),N=S.IDENTIFIER,void 0}if('"'==C){for(n();""!=C&&('"'!=C||'"'==C&&'"'==s());)O+=C,'"'==C&&n(),n();if('"'!=C)throw _('End of string " expected');return n(),N=S.IDENTIFIER,void 0}for(N=S.UNKNOWN;""!=C;)O+=C,n();throw new SyntaxError('Syntax error in part "'+b(O,30)+'"')}function l(){var t={};if(i(),u(),"strict"==O&&(t.strict=!0,u()),("graph"==O||"digraph"==O)&&(t.type=O,u()),N==S.IDENTIFIER&&(t.id=O,u()),"{"!=O)throw _("Angle bracket { expected");if(u(),p(t),"}"!=O)throw _("Angle bracket } expected");if(u(),""!==O)throw _("End of file expected");return u(),delete t.node,delete t.edge,delete t.graph,t}function p(t){for(;""!==O&&"}"!=O;)f(t),";"==O&&u()}function f(t){var e=m(t);if(e)return y(t,e),void 0;var i=g(t);if(!i){if(N!=S.IDENTIFIER)throw _("Identifier expected");var n=O;if(u(),"="==O){if(u(),N!=S.IDENTIFIER)throw _("Identifier expected");t[n]=O,u()}else v(t,n)}}function m(t){var e=null;if("subgraph"==O&&(e={},e.type="subgraph",u(),N==S.IDENTIFIER&&(e.id=O,u())),"{"==O){if(u(),e||(e={}),e.parent=t,e.node=t.node,e.edge=t.edge,e.graph=t.graph,p(e),"}"!=O)throw _("Angle bracket } expected");u(),delete e.node,delete e.edge,delete e.graph,delete e.parent,t.subgraphs||(t.subgraphs=[]),t.subgraphs.push(e)}return e}function g(t){return"node"==O?(u(),t.node=w(),"node"):"edge"==O?(u(),t.edge=w(),"edge"):"graph"==O?(u(),t.graph=w(),"graph"):null}function v(t,e){var i={id:e},n=w();n&&(i.attr=n),h(t,i),y(t,e)}function y(t,e){for(;"->"==O||"--"==O;){var i,n=O;u();var s=m(t);if(s)i=s;else{if(N!=S.IDENTIFIER)throw _("Identifier or subgraph expected");i=O,h(t,{id:i}),u()}var r=w(),o=c(t,e,i,n,r);d(t,o),e=i}}function w(){for(var t=null;"["==O;){for(u(),t={};""!==O&&"]"!=O;){if(N!=S.IDENTIFIER)throw _("Attribute name expected");var e=O;if(u(),"="!=O)throw _("Equal sign = expected");if(u(),N!=S.IDENTIFIER)throw _("Attribute value expected");var i=O;a(t,e,i),u(),","==O&&u()}if("]"!=O)throw _("Bracket ] expected");u()}return t}function _(t){return new SyntaxError(t+', got "'+b(O,30)+'" (char '+M+")")}function b(t,e){return t.length<=e?t:t.substr(0,27)+"..."}function E(t,e,i){t instanceof Array?t.forEach(function(t){e instanceof Array?e.forEach(function(e){i(t,e)}):i(t,e)}):e instanceof Array?e.forEach(function(e){i(t,e)}):i(t,e)}function T(t){function i(t){var e={from:t.from,to:t.to};return o(e,t.attr),e.style="->"==t.type?"arrow":"line",e}var n=e(t),s={nodes:[],edges:[],options:{}};return n.nodes&&n.nodes.forEach(function(t){var e={id:t.id,label:String(t.label||t.id)};o(e,t.attr),e.image&&(e.shape="image"),s.nodes.push(e)}),n.edges&&n.edges.forEach(function(t){var e,n;e=t.from instanceof Object?t.from.nodes:{id:t.from},n=t.to instanceof Object?t.to.nodes:{id:t.to},t.from instanceof Object&&t.from.edges&&t.from.edges.forEach(function(t){var e=i(t);s.edges.push(e)}),E(e,n,function(e,n){var r=c(s,e.id,n.id,t.type,t.attr),o=i(r);s.edges.push(o)}),t.to instanceof Object&&t.to.edges&&t.to.edges.forEach(function(t){var e=i(t);s.edges.push(e)})}),n.attr&&(s.options=n.attr),s}var S={NULL:0,DELIMITER:1,IDENTIFIER:2,UNKNOWN:3},x={"{":!0,"}":!0,"[":!0,"]":!0,";":!0,"=":!0,",":!0,"->":!0,"--":!0},D="",M=0,C="",O="",N=S.NULL,L=/[a-zA-Z_0-9.:#]/;t.parseDOT=e,t.DOTToGraph=T}("undefined"!=typeof A?A:n),"undefined"!=typeof CanvasRenderingContext2D&&(CanvasRenderingContext2D.prototype.circle=function(t,e,i){this.beginPath(),this.arc(t,e,i,0,2*Math.PI,!1)},CanvasRenderingContext2D.prototype.square=function(t,e,i){this.beginPath(),this.rect(t-i,e-i,2*i,2*i)},CanvasRenderingContext2D.prototype.triangle=function(t,e,i){this.beginPath();var n=2*i,s=n/2,r=Math.sqrt(3)/6*n,o=Math.sqrt(n*n-s*s);this.moveTo(t,e-(o-r)),this.lineTo(t+s,e+r),this.lineTo(t-s,e+r),this.lineTo(t,e-(o-r)),this.closePath()},CanvasRenderingContext2D.prototype.triangleDown=function(t,e,i){this.beginPath();var n=2*i,s=n/2,r=Math.sqrt(3)/6*n,o=Math.sqrt(n*n-s*s);this.moveTo(t,e+(o-r)),this.lineTo(t+s,e-r),this.lineTo(t-s,e-r),this.lineTo(t,e+(o-r)),this.closePath()},CanvasRenderingContext2D.prototype.star=function(t,e,i){this.beginPath();for(var n=0;10>n;n++){var s=n%2===0?1.3*i:.5*i;this.lineTo(t+s*Math.sin(2*n*Math.PI/10),e-s*Math.cos(2*n*Math.PI/10))}this.closePath()},CanvasRenderingContext2D.prototype.roundRect=function(t,e,i,n,s){var r=Math.PI/180;0>i-2*s&&(s=i/2),0>n-2*s&&(s=n/2),this.beginPath(),this.moveTo(t+s,e),this.lineTo(t+i-s,e),this.arc(t+i-s,e+s,s,270*r,360*r,!1),this.lineTo(t+i,e+n-s),this.arc(t+i-s,e+n-s,s,0,90*r,!1),this.lineTo(t+s,e+n),this.arc(t+s,e+n-s,s,90*r,180*r,!1),this.lineTo(t,e+s),this.arc(t+s,e+s,s,180*r,270*r,!1)},CanvasRenderingContext2D.prototype.ellipse=function(t,e,i,n){var s=.5522848,r=i/2*s,o=n/2*s,a=t+i,h=e+n,d=t+i/2,c=e+n/2;this.beginPath(),this.moveTo(t,c),this.bezierCurveTo(t,c-o,d-r,e,d,e),this.bezierCurveTo(d+r,e,a,c-o,a,c),this.bezierCurveTo(a,c+o,d+r,h,d,h),this.bezierCurveTo(d-r,h,t,c+o,t,c)},CanvasRenderingContext2D.prototype.database=function(t,e,i,n){var s=1/3,r=i,o=n*s,a=.5522848,h=r/2*a,d=o/2*a,c=t+r,u=e+o,l=t+r/2,p=e+o/2,f=e+(n-o/2),m=e+n;this.beginPath(),this.moveTo(c,p),this.bezierCurveTo(c,p+d,l+h,u,l,u),this.bezierCurveTo(l-h,u,t,p+d,t,p),this.bezierCurveTo(t,p-d,l-h,e,l,e),this.bezierCurveTo(l+h,e,c,p-d,c,p),this.lineTo(c,f),this.bezierCurveTo(c,f+d,l+h,m,l,m),this.bezierCurveTo(l-h,m,t,f+d,t,f),this.lineTo(t,p)},CanvasRenderingContext2D.prototype.arrow=function(t,e,i,n){var s=t-n*Math.cos(i),r=e-n*Math.sin(i),o=t-.9*n*Math.cos(i),a=e-.9*n*Math.sin(i),h=s+n/3*Math.cos(i+.5*Math.PI),d=r+n/3*Math.sin(i+.5*Math.PI),c=s+n/3*Math.cos(i-.5*Math.PI),u=r+n/3*Math.sin(i-.5*Math.PI);this.beginPath(),this.moveTo(t,e),this.lineTo(h,d),this.lineTo(o,a),this.lineTo(c,u),this.closePath()},CanvasRenderingContext2D.prototype.dashedLine=function(t,e,i,n,s){s||(s=[10,5]),0==l&&(l=.001);var r=s.length;this.moveTo(t,e);for(var o=i-t,a=n-e,h=a/o,d=Math.sqrt(o*o+a*a),c=0,u=!0;d>=.1;){var l=s[c++%r];l>d&&(l=d);var p=Math.sqrt(l*l/(1+h*h));0>o&&(p=-p),t+=p,e+=h*p,this[u?"lineTo":"moveTo"](t,e),d-=l,u=!u}}),M.prototype.attachEdge=function(t){-1==this.edges.indexOf(t)&&this.edges.push(t),this._updateMass()},M.prototype.detachEdge=function(t){var e=this.edges.indexOf(t);-1!=e&&this.edges.splice(e,1),this._updateMass()},M.prototype._updateMass=function(){this.mass=50+20*this.edges.length},M.prototype.setProperties=function(t,e){if(t){if(void 0!=t.id&&(this.id=t.id),void 0!=t.label&&(this.label=t.label),void 0!=t.title&&(this.title=t.title),void 0!=t.group&&(this.group=t.group),void 0!=t.x&&(this.x=t.x),void 0!=t.y&&(this.y=t.y),void 0!=t.value&&(this.value=t.value),void 0===this.id)throw"Node must have an id";if(this.group){var i=this.grouplist.get(this.group);for(var n in i)i.hasOwnProperty(n)&&(this[n]=i[n])}if(void 0!=t.shape&&(this.shape=t.shape),void 0!=t.image&&(this.image=t.image),void 0!=t.radius&&(this.radius=t.radius),void 0!=t.color&&(this.color=M.parseColor(t.color)),void 0!=t.fontColor&&(this.fontColor=t.fontColor),void 0!=t.fontSize&&(this.fontSize=t.fontSize),void 0!=t.fontFace&&(this.fontFace=t.fontFace),void 0!=this.image){if(!this.imagelist)throw"No imagelist provided";this.imageObj=this.imagelist.load(this.image)}switch(this.xFixed=this.xFixed||void 0!=t.x,this.yFixed=this.yFixed||void 0!=t.y,this.radiusFixed=this.radiusFixed||void 0!=t.radius,"image"==this.shape&&(this.radiusMin=e.nodes.widthMin,this.radiusMax=e.nodes.widthMax),this.shape){case"database":this.draw=this._drawDatabase,this.resize=this._resizeDatabase;break;case"box":this.draw=this._drawBox,this.resize=this._resizeBox;break;case"circle":this.draw=this._drawCircle,this.resize=this._resizeCircle;break;case"ellipse":this.draw=this._drawEllipse,this.resize=this._resizeEllipse;break;case"image":this.draw=this._drawImage,this.resize=this._resizeImage;break;case"text":this.draw=this._drawText,this.resize=this._resizeText;break;case"dot":this.draw=this._drawDot,this.resize=this._resizeShape;break;case"square":this.draw=this._drawSquare,this.resize=this._resizeShape;break;case"triangle":this.draw=this._drawTriangle,this.resize=this._resizeShape;break;case"triangleDown":this.draw=this._drawTriangleDown,this.resize=this._resizeShape;break;case"star":this.draw=this._drawStar,this.resize=this._resizeShape;break;default:this.draw=this._drawEllipse,this.resize=this._resizeEllipse}this._reset()}},M.parseColor=function(t){var e;return A.isString(t)?e={border:t,background:t,highlight:{border:t,background:t}}:(e={},e.background=t.background||"white",e.border=t.border||e.background,A.isString(t.highlight)?e.highlight={border:t.highlight,background:t.highlight}:(e.highlight={},e.highlight.background=t.highlight&&t.highlight.background||e.background,e.highlight.border=t.highlight&&t.highlight.border||e.border)),e},M.prototype.select=function(){this.selected=!0,this._reset()},M.prototype.unselect=function(){this.selected=!1,this._reset()},M.prototype._reset=function(){this.width=void 0,this.height=void 0},M.prototype.getTitle=function(){return this.title},M.prototype.distanceToBorder=function(t,e){var i=1;switch(this.width||this.resize(t),this.shape){case"circle":case"dot":return this.radius+i;case"ellipse":var n=this.width/2,s=this.height/2,r=Math.sin(e)*n,o=Math.cos(e)*s;return n*s/Math.sqrt(r*r+o*o);case"box":case"image":case"text":default:return this.width?Math.min(Math.abs(this.width/2/Math.cos(e)),Math.abs(this.height/2/Math.sin(e)))+i:0}},M.prototype._setForce=function(t,e){this.fx=t,this.fy=e},M.prototype._addForce=function(t,e){this.fx+=t,this.fy+=e},M.prototype.discreteStep=function(t){if(!this.xFixed){var e=-this.damping*this.vx,i=(this.fx+e)/this.mass;this.vx+=i/t,this.x+=this.vx/t}if(!this.yFixed){var n=-this.damping*this.vy,s=(this.fy+n)/this.mass;this.vy+=s/t,this.y+=this.vy/t}},M.prototype.isFixed=function(){return this.xFixed&&this.yFixed},M.prototype.isMoving=function(t){return Math.abs(this.vx)>t||Math.abs(this.vy)>t||!this.xFixed&&Math.abs(this.fx)>this.minForce||!this.yFixed&&Math.abs(this.fy)>this.minForce},M.prototype.isSelected=function(){return this.selected},M.prototype.getValue=function(){return this.value},M.prototype.getDistance=function(t,e){var i=this.x-t,n=this.y-e;return Math.sqrt(i*i+n*n)},M.prototype.setValueRange=function(t,e){if(!this.radiusFixed&&void 0!==this.value)if(e==t)this.radius=(this.radiusMin+this.radiusMax)/2;else{var i=(this.radiusMax-this.radiusMin)/(e-t);this.radius=(this.value-t)*i+this.radiusMin}},M.prototype.draw=function(){throw"Draw method not initialized for node"},M.prototype.resize=function(){throw"Resize method not initialized for node"},M.prototype.isOverlappingWith=function(t){return this.left<t.right&&this.left+this.width>t.left&&this.top<t.bottom&&this.top+this.height>t.top},M.prototype._resizeImage=function(){if(!this.width){var t,e;if(this.value){var i=this.imageObj.height/this.imageObj.width;t=this.radius||this.imageObj.width,e=this.radius*i||this.imageObj.height}else t=this.imageObj.width,e=this.imageObj.height;this.width=t,this.height=e}},M.prototype._drawImage=function(t){this._resizeImage(t),this.left=this.x-this.width/2,this.top=this.y-this.height/2;var e;this.imageObj?(t.drawImage(this.imageObj,this.left,this.top,this.width,this.height),e=this.y+this.height/2):e=this.y,this._label(t,this.label,this.x,e,void 0,"top")},M.prototype._resizeBox=function(t){if(!this.width){var e=5,i=this.getTextSize(t);this.width=i.width+2*e,this.height=i.height+2*e}},M.prototype._drawBox=function(t){this._resizeBox(t),this.left=this.x-this.width/2,this.top=this.y-this.height/2,t.strokeStyle=this.selected?this.color.highlight.border:this.color.border,t.fillStyle=this.selected?this.color.highlight.background:this.color.background,t.lineWidth=this.selected?2:1,t.roundRect(this.left,this.top,this.width,this.height,this.radius),t.fill(),t.stroke(),this._label(t,this.label,this.x,this.y)},M.prototype._resizeDatabase=function(t){if(!this.width){var e=5,i=this.getTextSize(t),n=i.width+2*e;this.width=n,this.height=n}},M.prototype._drawDatabase=function(t){this._resizeDatabase(t),this.left=this.x-this.width/2,this.top=this.y-this.height/2,t.strokeStyle=this.selected?this.color.highlight.border:this.color.border,t.fillStyle=this.selected?this.color.highlight.background:this.color.background,t.lineWidth=this.selected?2:1,t.database(this.x-this.width/2,this.y-.5*this.height,this.width,this.height),t.fill(),t.stroke(),this._label(t,this.label,this.x,this.y)},M.prototype._resizeCircle=function(t){if(!this.width){var e=5,i=this.getTextSize(t),n=Math.max(i.width,i.height)+2*e;this.radius=n/2,this.width=n,this.height=n}},M.prototype._drawCircle=function(t){this._resizeCircle(t),this.left=this.x-this.width/2,this.top=this.y-this.height/2,t.strokeStyle=this.selected?this.color.highlight.border:this.color.border,t.fillStyle=this.selected?this.color.highlight.background:this.color.background,t.lineWidth=this.selected?2:1,t.circle(this.x,this.y,this.radius),t.fill(),t.stroke(),this._label(t,this.label,this.x,this.y)},M.prototype._resizeEllipse=function(t){if(!this.width){var e=this.getTextSize(t);this.width=1.5*e.width,this.height=2*e.height,this.width<this.height&&(this.width=this.height)}},M.prototype._drawEllipse=function(t){this._resizeEllipse(t),this.left=this.x-this.width/2,this.top=this.y-this.height/2,t.strokeStyle=this.selected?this.color.highlight.border:this.color.border,t.fillStyle=this.selected?this.color.highlight.background:this.color.background,t.lineWidth=this.selected?2:1,t.ellipse(this.left,this.top,this.width,this.height),t.fill(),t.stroke(),this._label(t,this.label,this.x,this.y)},M.prototype._drawDot=function(t){this._drawShape(t,"circle")},M.prototype._drawTriangle=function(t){this._drawShape(t,"triangle")},M.prototype._drawTriangleDown=function(t){this._drawShape(t,"triangleDown")},M.prototype._drawSquare=function(t){this._drawShape(t,"square")},M.prototype._drawStar=function(t){this._drawShape(t,"star")},M.prototype._resizeShape=function(){if(!this.width){var t=2*this.radius;this.width=t,this.height=t}},M.prototype._drawShape=function(t,e){this._resizeShape(t),this.left=this.x-this.width/2,this.top=this.y-this.height/2,t.strokeStyle=this.selected?this.color.highlight.border:this.color.border,t.fillStyle=this.selected?this.color.highlight.background:this.color.background,t.lineWidth=this.selected?2:1,t[e](this.x,this.y,this.radius),t.fill(),t.stroke(),this.label&&this._label(t,this.label,this.x,this.y+this.height/2,void 0,"top")
+},M.prototype._resizeText=function(t){if(!this.width){var e=5,i=this.getTextSize(t);this.width=i.width+2*e,this.height=i.height+2*e}},M.prototype._drawText=function(t){this._resizeText(t),this.left=this.x-this.width/2,this.top=this.y-this.height/2,this._label(t,this.label,this.x,this.y)},M.prototype._label=function(t,e,i,n,s,r){if(e){t.font=(this.selected?"bold ":"")+this.fontSize+"px "+this.fontFace,t.fillStyle=this.fontColor||"black",t.textAlign=s||"center",t.textBaseline=r||"middle";for(var o=e.split("\n"),a=o.length,h=this.fontSize+4,d=n+(1-a)/2*h,c=0;a>c;c++)t.fillText(o[c],i,d),d+=h}},M.prototype.getTextSize=function(t){if(void 0!=this.label){t.font=(this.selected?"bold ":"")+this.fontSize+"px "+this.fontFace;for(var e=this.label.split("\n"),i=(this.fontSize+4)*e.length,n=0,s=0,r=e.length;r>s;s++)n=Math.max(n,t.measureText(e[s]).width);return{width:n,height:i}}return{width:0,height:0}},C.prototype.setProperties=function(t,e){if(t)switch(void 0!=t.from&&(this.fromId=t.from),void 0!=t.to&&(this.toId=t.to),void 0!=t.id&&(this.id=t.id),void 0!=t.style&&(this.style=t.style),void 0!=t.label&&(this.label=t.label),this.label&&(this.fontSize=e.edges.fontSize,this.fontFace=e.edges.fontFace,this.fontColor=e.edges.fontColor,void 0!=t.fontColor&&(this.fontColor=t.fontColor),void 0!=t.fontSize&&(this.fontSize=t.fontSize),void 0!=t.fontFace&&(this.fontFace=t.fontFace)),void 0!=t.title&&(this.title=t.title),void 0!=t.width&&(this.width=t.width),void 0!=t.value&&(this.value=t.value),void 0!=t.length&&(this.length=t.length),t.dash&&(void 0!=t.dash.length&&(this.dash.length=t.dash.length),void 0!=t.dash.gap&&(this.dash.gap=t.dash.gap),void 0!=t.dash.altLength&&(this.dash.altLength=t.dash.altLength)),void 0!=t.color&&(this.color=t.color),this.connect(),this.widthFixed=this.widthFixed||void 0!=t.width,this.lengthFixed=this.lengthFixed||void 0!=t.length,this.stiffness=1/this.length,this.style){case"line":this.draw=this._drawLine;break;case"arrow":this.draw=this._drawArrow;break;case"arrow-center":this.draw=this._drawArrowCenter;break;case"dash-line":this.draw=this._drawDashLine;break;default:this.draw=this._drawLine}},C.prototype.connect=function(){this.disconnect(),this.from=this.graph.nodes[this.fromId]||null,this.to=this.graph.nodes[this.toId]||null,this.connected=this.from&&this.to,this.connected?(this.from.attachEdge(this),this.to.attachEdge(this)):(this.from&&this.from.detachEdge(this),this.to&&this.to.detachEdge(this))},C.prototype.disconnect=function(){this.from&&(this.from.detachEdge(this),this.from=null),this.to&&(this.to.detachEdge(this),this.to=null),this.connected=!1},C.prototype.getTitle=function(){return this.title},C.prototype.getValue=function(){return this.value},C.prototype.setValueRange=function(t,e){if(!this.widthFixed&&void 0!==this.value){var i=(this.widthMax-this.widthMin)/(e-t);this.width=(this.value-t)*i+this.widthMin}},C.prototype.draw=function(){throw"Method draw not initialized in edge"},C.prototype.isOverlappingWith=function(t){var e=10,i=this.from.x,n=this.from.y,s=this.to.x,r=this.to.y,o=t.left,a=t.top,h=C._dist(i,n,s,r,o,a);return e>h},C.prototype._drawLine=function(t){t.strokeStyle=this.color,t.lineWidth=this._getLineWidth();var e;if(this.from!=this.to)this._line(t),this.label&&(e=this._pointOnLine(.5),this._label(t,this.label,e.x,e.y));else{var i,n,s=this.length/4,r=this.from;r.width||r.resize(t),r.width>r.height?(i=r.x+r.width/2,n=r.y-s):(i=r.x+s,n=r.y-r.height/2),this._circle(t,i,n,s),e=this._pointOnCircle(i,n,s,.5),this._label(t,this.label,e.x,e.y)}},C.prototype._getLineWidth=function(){return this.from.selected||this.to.selected?Math.min(2*this.width,this.widthMax):this.width},C.prototype._line=function(t){t.beginPath(),t.moveTo(this.from.x,this.from.y),t.lineTo(this.to.x,this.to.y),t.stroke()},C.prototype._circle=function(t,e,i,n){t.beginPath(),t.arc(e,i,n,0,2*Math.PI,!1),t.stroke()},C.prototype._label=function(t,e,i,n){if(e){t.font=(this.from.selected||this.to.selected?"bold ":"")+this.fontSize+"px "+this.fontFace,t.fillStyle="white";var s=t.measureText(e).width,r=this.fontSize,o=i-s/2,a=n-r/2;t.fillRect(o,a,s,r),t.fillStyle=this.fontColor||"black",t.textAlign="left",t.textBaseline="top",t.fillText(e,o,a)}},C.prototype._drawDashLine=function(t){if(t.strokeStyle=this.color,t.lineWidth=this._getLineWidth(),t.beginPath(),t.lineCap="round",void 0!=this.dash.altLength?t.dashedLine(this.from.x,this.from.y,this.to.x,this.to.y,[this.dash.length,this.dash.gap,this.dash.altLength,this.dash.gap]):void 0!=this.dash.length&&void 0!=this.dash.gap?t.dashedLine(this.from.x,this.from.y,this.to.x,this.to.y,[this.dash.length,this.dash.gap]):(t.moveTo(this.from.x,this.from.y),t.lineTo(this.to.x,this.to.y)),t.stroke(),this.label){var e=this._pointOnLine(.5);this._label(t,this.label,e.x,e.y)}},C.prototype._pointOnLine=function(t){return{x:(1-t)*this.from.x+t*this.to.x,y:(1-t)*this.from.y+t*this.to.y}},C.prototype._pointOnCircle=function(t,e,i,n){var s=2*(n-3/8)*Math.PI;return{x:t+i*Math.cos(s),y:e-i*Math.sin(s)}},C.prototype._drawArrowCenter=function(t){var e;if(t.strokeStyle=this.color,t.fillStyle=this.color,t.lineWidth=this._getLineWidth(),this.from!=this.to){this._line(t);var i=Math.atan2(this.to.y-this.from.y,this.to.x-this.from.x),n=10+5*this.width;e=this._pointOnLine(.5),t.arrow(e.x,e.y,i,n),t.fill(),t.stroke(),this.label&&(e=this._pointOnLine(.5),this._label(t,this.label,e.x,e.y))}else{var s,r,o=this.length/4,a=this.from;a.width||a.resize(t),a.width>a.height?(s=a.x+a.width/2,r=a.y-o):(s=a.x+o,r=a.y-a.height/2),this._circle(t,s,r,o);var i=.2*Math.PI,n=10+5*this.width;e=this._pointOnCircle(s,r,o,.5),t.arrow(e.x,e.y,i,n),t.fill(),t.stroke(),this.label&&(e=this._pointOnCircle(s,r,o,.5),this._label(t,this.label,e.x,e.y))}},C.prototype._drawArrow=function(t){t.strokeStyle=this.color,t.fillStyle=this.color,t.lineWidth=this._getLineWidth();var e,i;if(this.from!=this.to){e=Math.atan2(this.to.y-this.from.y,this.to.x-this.from.x);var n=this.to.x-this.from.x,s=this.to.y-this.from.y,r=Math.sqrt(n*n+s*s),o=this.from.distanceToBorder(t,e+Math.PI),a=(r-o)/r,h=a*this.from.x+(1-a)*this.to.x,d=a*this.from.y+(1-a)*this.to.y,c=this.to.distanceToBorder(t,e),u=(r-c)/r,l=(1-u)*this.from.x+u*this.to.x,p=(1-u)*this.from.y+u*this.to.y;if(t.beginPath(),t.moveTo(h,d),t.lineTo(l,p),t.stroke(),i=10+5*this.width,t.arrow(l,p,e,i),t.fill(),t.stroke(),this.label){var f=this._pointOnLine(.5);this._label(t,this.label,f.x,f.y)}}else{var m,g,v,y=this.from,w=this.length/4;y.width||y.resize(t),y.width>y.height?(m=y.x+y.width/2,g=y.y-w,v={x:m,y:y.y,angle:.9*Math.PI}):(m=y.x+w,g=y.y-y.height/2,v={x:y.x,y:g,angle:.6*Math.PI}),t.beginPath(),t.arc(m,g,w,0,2*Math.PI,!1),t.stroke(),i=10+5*this.width,t.arrow(v.x,v.y,v.angle,i),t.fill(),t.stroke(),this.label&&(f=this._pointOnCircle(m,g,w,.5),this._label(t,this.label,f.x,f.y))}},C._dist=function(t,e,i,n,s,r){var o=i-t,a=n-e,h=o*o+a*a,d=((s-t)*o+(r-e)*a)/h;d>1?d=1:0>d&&(d=0);var c=t+d*o,u=e+d*a,l=c-s,p=u-r;return Math.sqrt(l*l+p*p)},O.prototype.setPosition=function(t,e){this.x=parseInt(t),this.y=parseInt(e)},O.prototype.setText=function(t){this.frame.innerHTML=t},O.prototype.show=function(t){if(void 0===t&&(t=!0),t){var e=this.frame.clientHeight,i=this.frame.clientWidth,n=this.frame.parentNode.clientHeight,s=this.frame.parentNode.clientWidth,r=this.y-e;r+e+this.padding>n&&(r=n-e-this.padding),r<this.padding&&(r=this.padding);var o=this.x;o+i+this.padding>s&&(o=s-i-this.padding),o<this.padding&&(o=this.padding),this.frame.style.left=o+"px",this.frame.style.top=r+"px",this.frame.style.visibility="visible"}else this.hide()},O.prototype.hide=function(){this.frame.style.visibility="hidden"},Groups=function(){this.clear(),this.defaultIndex=0},Groups.DEFAULT=[{border:"#2B7CE9",background:"#97C2FC",highlight:{border:"#2B7CE9",background:"#D2E5FF"}},{border:"#FFA500",background:"#FFFF00",highlight:{border:"#FFA500",background:"#FFFFA3"}},{border:"#FA0A10",background:"#FB7E81",highlight:{border:"#FA0A10",background:"#FFAFB1"}},{border:"#41A906",background:"#7BE141",highlight:{border:"#41A906",background:"#A1EC76"}},{border:"#E129F0",background:"#EB7DF4",highlight:{border:"#E129F0",background:"#F0B3F5"}},{border:"#7C29F0",background:"#AD85E4",highlight:{border:"#7C29F0",background:"#D3BDF0"}},{border:"#C37F00",background:"#FFA807",highlight:{border:"#C37F00",background:"#FFCA66"}},{border:"#4220FB",background:"#6E6EFD",highlight:{border:"#4220FB",background:"#9B9BFD"}},{border:"#FD5A77",background:"#FFC0CB",highlight:{border:"#FD5A77",background:"#FFD1D9"}},{border:"#4AD63A",background:"#C2FABC",highlight:{border:"#4AD63A",background:"#E6FFE3"}}],Groups.prototype.clear=function(){this.groups={},this.groups.length=function(){var t=0;for(var e in this)this.hasOwnProperty(e)&&t++;return t}},Groups.prototype.get=function(t){var e=this.groups[t];if(void 0==e){var i=this.defaultIndex%Groups.DEFAULT.length;this.defaultIndex++,e={},e.color=Groups.DEFAULT[i],this.groups[t]=e}return e},Groups.prototype.add=function(t,e){return this.groups[t]=e,e.color&&(e.color=M.parseColor(e.color)),e},Images=function(){this.images={},this.callback=void 0},Images.prototype.setOnloadCallback=function(t){this.callback=t},Images.prototype.load=function(t){var e=this.images[t];if(void 0==e){var i=this;e=new Image,this.images[t]=e,e.onload=function(){i.callback&&i.callback(this)},e.src=t}return e},N.prototype.setData=function(t){if(t&&t.dot&&(t.nodes||t.edges))throw new SyntaxError('Data must contain either parameter "dot" or  parameter pair "nodes" and "edges", but not both.');if(this.setOptions(t&&t.options),t&&t.dot){if(t&&t.dot){var e=R.util.DOTToGraph(t.dot);return this.setData(e),void 0}}else this._setNodes(t&&t.nodes),this._setEdges(t&&t.edges);this.stabilize&&this._doStabilize(),this.start()},N.prototype.setOptions=function(t){if(t){if(void 0!=t.width&&(this.width=t.width),void 0!=t.height&&(this.height=t.height),void 0!=t.stabilize&&(this.stabilize=t.stabilize),void 0!=t.selectable&&(this.selectable=t.selectable),t.edges){for(var e in t.edges)t.edges.hasOwnProperty(e)&&(this.constants.edges[e]=t.edges[e]);void 0!=t.edges.length&&t.nodes&&void 0==t.nodes.distance&&(this.constants.edges.length=t.edges.length,this.constants.nodes.distance=1.25*t.edges.length),t.edges.fontColor||(this.constants.edges.fontColor=t.edges.color),t.edges.dash&&(void 0!=t.edges.dash.length&&(this.constants.edges.dash.length=t.edges.dash.length),void 0!=t.edges.dash.gap&&(this.constants.edges.dash.gap=t.edges.dash.gap),void 0!=t.edges.dash.altLength&&(this.constants.edges.dash.altLength=t.edges.dash.altLength))}if(t.nodes){for(e in t.nodes)t.nodes.hasOwnProperty(e)&&(this.constants.nodes[e]=t.nodes[e]);t.nodes.color&&(this.constants.nodes.color=M.parseColor(t.nodes.color))}if(t.groups)for(var i in t.groups)if(t.groups.hasOwnProperty(i)){var n=t.groups[i];this.groups.add(i,n)}}this.setSize(this.width,this.height),this._setTranslation(this.frame.clientWidth/2,this.frame.clientHeight/2),this._setScale(1)},N.prototype._trigger=function(t,e){Y.trigger(this,t,e)},N.prototype._create=function(){for(;this.containerElement.hasChildNodes();)this.containerElement.removeChild(this.containerElement.firstChild);if(this.frame=document.createElement("div"),this.frame.className="graph-frame",this.frame.style.position="relative",this.frame.style.overflow="hidden",this.frame.canvas=document.createElement("canvas"),this.frame.canvas.style.position="relative",this.frame.appendChild(this.frame.canvas),!this.frame.canvas.getContext){var t=document.createElement("DIV");t.style.color="red",t.style.fontWeight="bold",t.style.padding="10px",t.innerHTML="Error: your browser does not support HTML canvas",this.frame.canvas.appendChild(t)}var e=this;this.drag={},this.pinch={},this.hammer=L(this.frame.canvas,{prevent_default:!0}),this.hammer.on("tap",e._onTap.bind(e)),this.hammer.on("hold",e._onHold.bind(e)),this.hammer.on("pinch",e._onPinch.bind(e)),this.hammer.on("touch",e._onTouch.bind(e)),this.hammer.on("dragstart",e._onDragStart.bind(e)),this.hammer.on("drag",e._onDrag.bind(e)),this.hammer.on("dragend",e._onDragEnd.bind(e)),this.hammer.on("mousewheel",e._onMouseWheel.bind(e)),this.hammer.on("DOMMouseScroll",e._onMouseWheel.bind(e)),this.hammer.on("mousemove",e._onMouseMoveTitle.bind(e)),this.containerElement.appendChild(this.frame)},N.prototype._getNodeAt=function(t){var e=this._canvasToX(t.x),i=this._canvasToY(t.y),n={left:e,top:i,right:e,bottom:i},s=this._getNodesOverlappingWith(n);return s.length>0?s[s.length-1]:null},N.prototype._getPointer=function(t){return{x:t.pageX-R.util.getAbsoluteLeft(this.frame.canvas),y:t.pageY-R.util.getAbsoluteTop(this.frame.canvas)}},N.prototype._onTouch=function(t){this.drag.pointer=this._getPointer(t.gesture.touches[0]),this.drag.pinched=!1,this.pinch.scale=this._getScale()},N.prototype._onDragStart=function(){var t=this.drag;t.selection=[],t.translation=this._getTranslation(),t.nodeId=this._getNodeAt(t.pointer);var e=this.nodes[t.nodeId];if(e){e.isSelected()||this._selectNodes([t.nodeId]);var i=this;this.selection.forEach(function(e){var n=i.nodes[e];if(n){var s={id:e,node:n,x:n.x,y:n.y,xFixed:n.xFixed,yFixed:n.yFixed};n.xFixed=!0,n.yFixed=!0,t.selection.push(s)}})}},N.prototype._onDrag=function(t){if(!this.drag.pinched){var e=this._getPointer(t.gesture.touches[0]),i=this,n=this.drag,s=n.selection;if(s&&s.length){var r=e.x-n.pointer.x,o=e.y-n.pointer.y;s.forEach(function(t){var e=t.node;t.xFixed||(e.x=i._canvasToX(i._xToCanvas(t.x)+r)),t.yFixed||(e.y=i._canvasToY(i._yToCanvas(t.y)+o))}),this.moving||(this.moving=!0,this.start())}else{var a=e.x-this.drag.pointer.x,h=e.y-this.drag.pointer.y;this._setTranslation(this.drag.translation.x+a,this.drag.translation.y+h),this._redraw(),this.moved=!0}}},N.prototype._onDragEnd=function(){var t=this.drag.selection;t&&t.forEach(function(t){t.node.xFixed=t.xFixed,t.node.yFixed=t.yFixed})},N.prototype._onTap=function(t){var e=this._getPointer(t.gesture.touches[0]),i=this._getNodeAt(e),n=this.nodes[i];n?(this._selectNodes([i]),this.moving||this._redraw()):(this._unselectNodes(),this._redraw())},N.prototype._onHold=function(t){var e=this._getPointer(t.gesture.touches[0]),i=this._getNodeAt(e),n=this.nodes[i];if(n){if(n.isSelected())this._unselectNodes([i]);else{var s=!0;this._selectNodes([i],s)}this.moving||this._redraw()}},N.prototype._onPinch=function(t){var e=this._getPointer(t.gesture.center);this.drag.pinched=!0,"scale"in this.pinch||(this.pinch.scale=1);var i=this.pinch.scale*t.gesture.scale;this._zoom(i,e)},N.prototype._zoom=function(t,e){var i=this._getScale();.01>t&&(t=.01),t>10&&(t=10);var n=this._getTranslation(),s=t/i,r=(1-s)*e.x+n.x*s,o=(1-s)*e.y+n.y*s;return this._setScale(t),this._setTranslation(r,o),this._redraw(),t},N.prototype._onMouseWheel=function(t){var e=0;if(t.wheelDelta?e=t.wheelDelta/120:t.detail&&(e=-t.detail/3),e){"mouswheelScale"in this.pinch||(this.pinch.mouswheelScale=1);var i=this.pinch.mouswheelScale,n=e/10;0>e&&(n/=1-n),i*=1+n;var s=A.fakeGesture(this,t),r=this._getPointer(s.center);i=this._zoom(i,r),this.pinch.mouswheelScale=i}t.preventDefault()},N.prototype._onMouseMoveTitle=function(t){var e=A.fakeGesture(this,t),i=this._getPointer(e.center);this.popupNode&&this._checkHidePopup(i);var n=this,s=function(){n._checkShowPopup(i)};this.popupTimer&&clearInterval(this.popupTimer),this.leftButtonDown||(this.popupTimer=setTimeout(s,300))},N.prototype._checkShowPopup=function(t){var e,i={left:this._canvasToX(t.x),top:this._canvasToY(t.y),right:this._canvasToX(t.x),bottom:this._canvasToY(t.y)},n=this.popupNode;if(void 0==this.popupNode){var s=this.nodes;for(e in s)if(s.hasOwnProperty(e)){var r=s[e];if(void 0!=r.getTitle()&&r.isOverlappingWith(i)){this.popupNode=r;break}}}if(void 0==this.popupNode){var o=this.edges;for(e in o)if(o.hasOwnProperty(e)){var a=o[e];if(a.connected&&void 0!=a.getTitle()&&a.isOverlappingWith(i)){this.popupNode=a;break}}}if(this.popupNode){if(this.popupNode!=n){var h=this;h.popup||(h.popup=new O(h.frame)),h.popup.setPosition(t.x-3,t.y-3),h.popup.setText(h.popupNode.getTitle()),h.popup.show()}}else this.popup&&this.popup.hide()},N.prototype._checkHidePopup=function(t){this.popupNode&&this._getNodeAt(t)||(this.popupNode=void 0,this.popup&&this.popup.hide())},N.prototype._unselectNodes=function(t,e){var i,n,s,r=!1;if(t)for(i=0,n=t.length;n>i;i++){s=t[i],this.nodes[s].unselect();for(var o=0;o<this.selection.length;)this.selection[o]==s?(this.selection.splice(o,1),r=!0):o++}else if(this.selection&&this.selection.length){for(i=0,n=this.selection.length;n>i;i++)s=this.selection[i],this.nodes[s].unselect(),r=!0;this.selection=[]}return!r||1!=e&&void 0!=e||this._trigger("select"),r},N.prototype._selectNodes=function(t,e){var i,n,s=!1,r=!0;if(t.length!=this.selection.length)r=!1;else for(i=0,n=Math.min(t.length,this.selection.length);n>i;i++)if(t[i]!=this.selection[i]){r=!1;break}if(r)return s;if(void 0==e||0==e){var o=!1;s=this._unselectNodes(void 0,o)}for(i=0,n=t.length;n>i;i++){var a=t[i],h=-1!=this.selection.indexOf(a);h||(this.nodes[a].select(),this.selection.push(a),s=!0)}return s&&this._trigger("select"),s},N.prototype._getNodesOverlappingWith=function(t){var e=this.nodes,i=[];for(var n in e)e.hasOwnProperty(n)&&e[n].isOverlappingWith(t)&&i.push(n);return i},N.prototype.getSelection=function(){return this.selection.concat([])},N.prototype.setSelection=function(t){var e,i,n;if(!t||void 0==t.length)throw"Selection must be an array with ids";for(e=0,i=this.selection.length;i>e;e++)n=this.selection[e],this.nodes[n].unselect();for(this.selection=[],e=0,i=t.length;i>e;e++){n=t[e];var s=this.nodes[n];if(!s)throw new RangeError('Node with id "'+n+'" not found');s.select(),this.selection.push(n)}this.redraw()},N.prototype._updateSelection=function(){for(var t=0;t<this.selection.length;){var e=this.selection[t];this.nodes[e]?t++:this.selection.splice(t,1)}},N.prototype._getConnectionCount=function(t){function e(t){for(var e=[],i=0,n=t.length;n>i;i++)for(var s=t[i],r=s.edges,o=0,a=r.length;a>o;o++){var h=r[o],d=null;h.from==s?d=h.to:h.to==s&&(d=h.from);var c,u;if(d)for(c=0,u=t.length;u>c;c++)if(t[c]==d){d=null;break}if(d)for(c=0,u=e.length;u>c;c++)if(e[c]==d){d=null;break}d&&e.push(d)}return e}void 0==t&&(t=1);var i=[],n=this.nodes;for(var s in n)if(n.hasOwnProperty(s)){for(var r=[n[s]],o=0;t>o;o++)r=r.concat(e(r));i.push(r)}for(var a=[],h=0,d=i.length;d>h;h++)a.push(i[h].length);return a},N.prototype.setSize=function(t,e){this.frame.style.width=t,this.frame.style.height=e,this.frame.canvas.style.width="100%",this.frame.canvas.style.height="100%",this.frame.canvas.width=this.frame.canvas.clientWidth,this.frame.canvas.height=this.frame.canvas.clientHeight},N.prototype._setNodes=function(t){var e=this.nodesData;if(t instanceof r||t instanceof o)this.nodesData=t;else if(t instanceof Array)this.nodesData=new r,this.nodesData.add(t);else{if(t)throw new TypeError("Array or DataSet expected");this.nodesData=new r}if(e&&A.forEach(this.nodesListeners,function(t,i){e.unsubscribe(i,t)}),this.nodes={},this.nodesData){var i=this;A.forEach(this.nodesListeners,function(t,e){i.nodesData.subscribe(e,t)});var n=this.nodesData.getIds();this._addNodes(n)}this._updateSelection()},N.prototype._addNodes=function(t){for(var e,i=0,n=t.length;n>i;i++){e=t[i];var s=this.nodesData.get(e),r=new M(s,this.images,this.groups,this.constants);if(this.nodes[e]=r,!r.isFixed()){var o=2*this.constants.edges.length,a=t.length,h=2*Math.PI*(i/a);r.x=o*Math.cos(h),r.y=o*Math.sin(h),this.moving=!0}}this._reconnectEdges(),this._updateValueRange(this.nodes)},N.prototype._updateNodes=function(t){for(var e=this.nodes,i=this.nodesData,n=0,s=t.length;s>n;n++){var r=t[n],o=e[r],a=i.get(r);o?o.setProperties(a,this.constants):(o=new M(properties,this.images,this.groups,this.constants),e[r]=o,o.isFixed()||(this.moving=!0))}this._reconnectEdges(),this._updateValueRange(e)},N.prototype._removeNodes=function(t){for(var e=this.nodes,i=0,n=t.length;n>i;i++){var s=t[i];delete e[s]}this._reconnectEdges(),this._updateSelection(),this._updateValueRange(e)},N.prototype._setEdges=function(t){var e=this.edgesData;if(t instanceof r||t instanceof o)this.edgesData=t;else if(t instanceof Array)this.edgesData=new r,this.edgesData.add(t);else{if(t)throw new TypeError("Array or DataSet expected");this.edgesData=new r}if(e&&A.forEach(this.edgesListeners,function(t,i){e.unsubscribe(i,t)}),this.edges={},this.edgesData){var i=this;A.forEach(this.edgesListeners,function(t,e){i.edgesData.subscribe(e,t)});var n=this.edgesData.getIds();this._addEdges(n)}this._reconnectEdges()},N.prototype._addEdges=function(t){for(var e=this.edges,i=this.edgesData,n=0,s=t.length;s>n;n++){var r=t[n],o=e[r];o&&o.disconnect();var a=i.get(r);e[r]=new C(a,this,this.constants)}this.moving=!0,this._updateValueRange(e)},N.prototype._updateEdges=function(t){for(var e=this.edges,i=this.edgesData,n=0,s=t.length;s>n;n++){var r=t[n],o=i.get(r),a=e[r];a?(a.disconnect(),a.setProperties(o,this.constants),a.connect()):(a=new C(o,this,this.constants),this.edges[r]=a)}this.moving=!0,this._updateValueRange(e)},N.prototype._removeEdges=function(t){for(var e=this.edges,i=0,n=t.length;n>i;i++){var s=t[i],r=e[s];r&&(r.disconnect(),delete e[s])}this.moving=!0,this._updateValueRange(e)},N.prototype._reconnectEdges=function(){var t,e=this.nodes,i=this.edges;for(t in e)e.hasOwnProperty(t)&&(e[t].edges=[]);for(t in i)if(i.hasOwnProperty(t)){var n=i[t];n.from=null,n.to=null,n.connect()}},N.prototype._updateValueRange=function(t){var e,i=void 0,n=void 0;for(e in t)if(t.hasOwnProperty(e)){var s=t[e].getValue();void 0!==s&&(i=void 0===i?s:Math.min(s,i),n=void 0===n?s:Math.max(s,n))}if(void 0!==i&&void 0!==n)for(e in t)t.hasOwnProperty(e)&&t[e].setValueRange(i,n)},N.prototype.redraw=function(){this.setSize(this.width,this.height),this._redraw()},N.prototype._redraw=function(){var t=this.frame.canvas.getContext("2d"),e=this.frame.canvas.width,i=this.frame.canvas.height;t.clearRect(0,0,e,i),t.save(),t.translate(this.translation.x,this.translation.y),t.scale(this.scale,this.scale),this._drawEdges(t),this._drawNodes(t),t.restore()},N.prototype._setTranslation=function(t,e){void 0===this.translation&&(this.translation={x:0,y:0}),void 0!==t&&(this.translation.x=t),void 0!==e&&(this.translation.y=e)},N.prototype._getTranslation=function(){return{x:this.translation.x,y:this.translation.y}},N.prototype._setScale=function(t){this.scale=t},N.prototype._getScale=function(){return this.scale},N.prototype._canvasToX=function(t){return(t-this.translation.x)/this.scale},N.prototype._xToCanvas=function(t){return t*this.scale+this.translation.x},N.prototype._canvasToY=function(t){return(t-this.translation.y)/this.scale},N.prototype._yToCanvas=function(t){return t*this.scale+this.translation.y},N.prototype._drawNodes=function(t){var e=this.nodes,i=[];for(var n in e)e.hasOwnProperty(n)&&(e[n].isSelected()?i.push(n):e[n].draw(t));for(var s=0,r=i.length;r>s;s++)e[i[s]].draw(t)},N.prototype._drawEdges=function(t){var e=this.edges;for(var i in e)if(e.hasOwnProperty(i)){var n=e[i];n.connected&&e[i].draw(t)}},N.prototype._doStabilize=function(){for(var t=(new Date,0),e=this.constants.minVelocity,i=!1;!i&&t<this.constants.maxIterations;)this._calculateForces(),this._discreteStepNodes(),i=!this._isMoving(e),t++;new Date},N.prototype._calculateForces=function(){var t,e,i,n,s,r,o,a,h,d,c,u=this.nodes,l=this.edges,p=.01,f=this.frame.canvas.clientWidth/2,m=this.frame.canvas.clientHeight/2;for(t in u)if(u.hasOwnProperty(t)){var g=u[t];e=f-g.x,i=m-g.y,n=Math.atan2(i,e),r=Math.cos(n)*p,o=Math.sin(n)*p,g._setForce(r,o)}var v=this.constants.nodes.distance,y=10;for(var w in u)if(u.hasOwnProperty(w)){var _=u[w];for(var b in u)if(u.hasOwnProperty(b)){var E=u[b];e=E.x-_.x,i=E.y-_.y,s=Math.sqrt(e*e+i*i),n=Math.atan2(i,e),a=1/(1+Math.exp((s/v-1)*y)),r=Math.cos(n)*a,o=Math.sin(n)*a,_._addForce(-r,-o),E._addForce(r,o)}}for(t in l)if(l.hasOwnProperty(t)){var T=l[t];T.connected&&(e=T.to.x-T.from.x,i=T.to.y-T.from.y,c=T.length,d=Math.sqrt(e*e+i*i),n=Math.atan2(i,e),h=T.stiffness*(c-d),r=Math.cos(n)*h,o=Math.sin(n)*h,T.from._addForce(-r,-o),T.to._addForce(r,o))}},N.prototype._isMoving=function(t){var e=this.nodes;for(var i in e)if(e.hasOwnProperty(i)&&e[i].isMoving(t))return!0;return!1},N.prototype._discreteStepNodes=function(){var t=this.refreshRate/1e3,e=this.nodes;for(var i in e)e.hasOwnProperty(i)&&e[i].discreteStep(t)},N.prototype.start=function(){if(this.moving){this._calculateForces(),this._discreteStepNodes();var t=this.constants.minVelocity;this.moving=this._isMoving(t)}if(this.moving){if(!this.timer){var e=this;this.timer=window.setTimeout(function(){e.timer=void 0,e.start(),e._redraw()},this.refreshRate)}}else this._redraw()},N.prototype.stop=function(){this.timer&&(window.clearInterval(this.timer),this.timer=void 0)};var R={util:A,events:Y,Controller:u,DataSet:r,DataView:o,Range:h,Stack:a,TimeStep:TimeStep,EventBus:s,components:{items:{Item:w,ItemBox:_,ItemPoint:b,ItemRange:E},Component:l,Panel:p,RootPanel:f,ItemSet:y,TimeAxis:m},graph:{Node:M,Edge:C,Popup:O,Groups:Groups,Images:Images},Timeline:D,Graph:N};"undefined"!=typeof n&&(n=R),"undefined"!=typeof i&&"undefined"!=typeof i.exports&&(i.exports=R),"function"==typeof t&&t(function(){return R}),"undefined"!=typeof window&&(window.vis=R)},{hammerjs:2,moment:3}],2:[function(t,e){!function(t,i){"use strict";function n(){if(!s.READY){s.event.determineEventTypes();for(var t in s.gestures)s.gestures.hasOwnProperty(t)&&s.detection.register(s.gestures[t]);s.event.onTouch(s.DOCUMENT,s.EVENT_MOVE,s.detection.detect),s.event.onTouch(s.DOCUMENT,s.EVENT_END,s.detection.detect),s.READY=!0}}var s=function(t,e){return new s.Instance(t,e||{})};s.defaults={stop_browser_behavior:{userSelect:"none",touchAction:"none",touchCallout:"none",contentZooming:"none",userDrag:"none",tapHighlightColor:"rgba(0,0,0,0)"}},s.HAS_POINTEREVENTS=navigator.pointerEnabled||navigator.msPointerEnabled,s.HAS_TOUCHEVENTS="ontouchstart"in t,s.MOBILE_REGEX=/mobile|tablet|ip(ad|hone|od)|android/i,s.NO_MOUSEEVENTS=s.HAS_TOUCHEVENTS&&navigator.userAgent.match(s.MOBILE_REGEX),s.EVENT_TYPES={},s.DIRECTION_DOWN="down",s.DIRECTION_LEFT="left",s.DIRECTION_UP="up",s.DIRECTION_RIGHT="right",s.POINTER_MOUSE="mouse",s.POINTER_TOUCH="touch",s.POINTER_PEN="pen",s.EVENT_START="start",s.EVENT_MOVE="move",s.EVENT_END="end",s.DOCUMENT=document,s.plugins={},s.READY=!1,s.Instance=function(t,e){var i=this;return n(),this.element=t,this.enabled=!0,this.options=s.utils.extend(s.utils.extend({},s.defaults),e||{}),this.options.stop_browser_behavior&&s.utils.stopDefaultBrowserBehavior(this.element,this.options.stop_browser_behavior),s.event.onTouch(t,s.EVENT_START,function(t){i.enabled&&s.detection.startDetect(i,t)}),this},s.Instance.prototype={on:function(t,e){for(var i=t.split(" "),n=0;n<i.length;n++)this.element.addEventListener(i[n],e,!1);return this},off:function(t,e){for(var i=t.split(" "),n=0;n<i.length;n++)this.element.removeEventListener(i[n],e,!1);return this},trigger:function(t,e){var i=s.DOCUMENT.createEvent("Event");i.initEvent(t,!0,!0),i.gesture=e;var n=this.element;return s.utils.hasParent(e.target,n)&&(n=e.target),n.dispatchEvent(i),this},enable:function(t){return this.enabled=t,this}};var r=null,o=!1,a=!1;s.event={bindDom:function(t,e,i){for(var n=e.split(" "),s=0;s<n.length;s++)t.addEventListener(n[s],i,!1)},onTouch:function(t,e,i){var n=this;this.bindDom(t,s.EVENT_TYPES[e],function(h){var d=h.type.toLowerCase();if(!d.match(/mouse/)||!a){(d.match(/touch/)||d.match(/pointerdown/)||d.match(/mouse/)&&1===h.which)&&(o=!0),d.match(/touch|pointer/)&&(a=!0);var c=0;o&&(s.HAS_POINTEREVENTS&&e!=s.EVENT_END?c=s.PointerEvent.updatePointer(e,h):d.match(/touch/)?c=h.touches.length:a||(c=d.match(/up/)?0:1),c>0&&e==s.EVENT_END?e=s.EVENT_MOVE:c||(e=s.EVENT_END),c||null===r?r=h:h=r,i.call(s.detection,n.collectEventData(t,e,h)),s.HAS_POINTEREVENTS&&e==s.EVENT_END&&(c=s.PointerEvent.updatePointer(e,h))),c||(r=null,o=!1,a=!1,s.PointerEvent.reset())}})},determineEventTypes:function(){var t;t=s.HAS_POINTEREVENTS?s.PointerEvent.getEvents():s.NO_MOUSEEVENTS?["touchstart","touchmove","touchend touchcancel"]:["touchstart mousedown","touchmove mousemove","touchend touchcancel mouseup"],s.EVENT_TYPES[s.EVENT_START]=t[0],s.EVENT_TYPES[s.EVENT_MOVE]=t[1],s.EVENT_TYPES[s.EVENT_END]=t[2]},getTouchList:function(t){return s.HAS_POINTEREVENTS?s.PointerEvent.getTouchList():t.touches?t.touches:[{identifier:1,pageX:t.pageX,pageY:t.pageY,target:t.target}]},collectEventData:function(t,e,i){var n=this.getTouchList(i,e),r=s.POINTER_TOUCH;return(i.type.match(/mouse/)||s.PointerEvent.matchType(s.POINTER_MOUSE,i))&&(r=s.POINTER_MOUSE),{center:s.utils.getCenter(n),timeStamp:(new Date).getTime(),target:i.target,touches:n,eventType:e,pointerType:r,srcEvent:i,preventDefault:function(){this.srcEvent.preventManipulation&&this.srcEvent.preventManipulation(),this.srcEvent.preventDefault&&this.srcEvent.preventDefault()},stopPropagation:function(){this.srcEvent.stopPropagation()},stopDetect:function(){return s.detection.stopDetect()}}}},s.PointerEvent={pointers:{},getTouchList:function(){var t=this,e=[];return Object.keys(t.pointers).sort().forEach(function(i){e.push(t.pointers[i])}),e},updatePointer:function(t,e){return t==s.EVENT_END?this.pointers={}:(e.identifier=e.pointerId,this.pointers[e.pointerId]=e),Object.keys(this.pointers).length},matchType:function(t,e){if(!e.pointerType)return!1;var i={};return i[s.POINTER_MOUSE]=e.pointerType==e.MSPOINTER_TYPE_MOUSE||e.pointerType==s.POINTER_MOUSE,i[s.POINTER_TOUCH]=e.pointerType==e.MSPOINTER_TYPE_TOUCH||e.pointerType==s.POINTER_TOUCH,i[s.POINTER_PEN]=e.pointerType==e.MSPOINTER_TYPE_PEN||e.pointerType==s.POINTER_PEN,i[t]},getEvents:function(){return["pointerdown MSPointerDown","pointermove MSPointerMove","pointerup pointercancel MSPointerUp MSPointerCancel"]},reset:function(){this.pointers={}}},s.utils={extend:function(t,e,n){for(var s in e)t[s]!==i&&n||(t[s]=e[s]);return t},hasParent:function(t,e){for(;t;){if(t==e)return!0;t=t.parentNode}return!1},getCenter:function(t){for(var e=[],i=[],n=0,s=t.length;s>n;n++)e.push(t[n].pageX),i.push(t[n].pageY);return{pageX:(Math.min.apply(Math,e)+Math.max.apply(Math,e))/2,pageY:(Math.min.apply(Math,i)+Math.max.apply(Math,i))/2}},getVelocity:function(t,e,i){return{x:Math.abs(e/t)||0,y:Math.abs(i/t)||0}},getAngle:function(t,e){var i=e.pageY-t.pageY,n=e.pageX-t.pageX;return 180*Math.atan2(i,n)/Math.PI},getDirection:function(t,e){var i=Math.abs(t.pageX-e.pageX),n=Math.abs(t.pageY-e.pageY);return i>=n?t.pageX-e.pageX>0?s.DIRECTION_LEFT:s.DIRECTION_RIGHT:t.pageY-e.pageY>0?s.DIRECTION_UP:s.DIRECTION_DOWN},getDistance:function(t,e){var i=e.pageX-t.pageX,n=e.pageY-t.pageY;return Math.sqrt(i*i+n*n)},getScale:function(t,e){return t.length>=2&&e.length>=2?this.getDistance(e[0],e[1])/this.getDistance(t[0],t[1]):1},getRotation:function(t,e){return t.length>=2&&e.length>=2?this.getAngle(e[1],e[0])-this.getAngle(t[1],t[0]):0},isVertical:function(t){return t==s.DIRECTION_UP||t==s.DIRECTION_DOWN},stopDefaultBrowserBehavior:function(t,e){var i,n=["webkit","khtml","moz","ms","o",""];if(e&&t.style){for(var s=0;s<n.length;s++)for(var r in e)e.hasOwnProperty(r)&&(i=r,n[s]&&(i=n[s]+i.substring(0,1).toUpperCase()+i.substring(1)),t.style[i]=e[r]);"none"==e.userSelect&&(t.onselectstart=function(){return!1})}}},s.detection={gestures:[],current:null,previous:null,stopped:!1,startDetect:function(t,e){this.current||(this.stopped=!1,this.current={inst:t,startEvent:s.utils.extend({},e),lastEvent:!1,name:""},this.detect(e))},detect:function(t){if(this.current&&!this.stopped){t=this.extendEventData(t);for(var e=this.current.inst.options,i=0,n=this.gestures.length;n>i;i++){var r=this.gestures[i];if(!this.stopped&&e[r.name]!==!1&&r.handler.call(r,t,this.current.inst)===!1){this.stopDetect();break}}return this.current&&(this.current.lastEvent=t),t.eventType==s.EVENT_END&&!t.touches.length-1&&this.stopDetect(),t}},stopDetect:function(){this.previous=s.utils.extend({},this.current),this.current=null,this.stopped=!0},extendEventData:function(t){var e=this.current.startEvent;
+if(e&&(t.touches.length!=e.touches.length||t.touches===e.touches)){e.touches=[];for(var i=0,n=t.touches.length;n>i;i++)e.touches.push(s.utils.extend({},t.touches[i]))}var r=t.timeStamp-e.timeStamp,o=t.center.pageX-e.center.pageX,a=t.center.pageY-e.center.pageY,h=s.utils.getVelocity(r,o,a);return s.utils.extend(t,{deltaTime:r,deltaX:o,deltaY:a,velocityX:h.x,velocityY:h.y,distance:s.utils.getDistance(e.center,t.center),angle:s.utils.getAngle(e.center,t.center),direction:s.utils.getDirection(e.center,t.center),scale:s.utils.getScale(e.touches,t.touches),rotation:s.utils.getRotation(e.touches,t.touches),startEvent:e}),t},register:function(t){var e=t.defaults||{};return e[t.name]===i&&(e[t.name]=!0),s.utils.extend(s.defaults,e,!0),t.index=t.index||1e3,this.gestures.push(t),this.gestures.sort(function(t,e){return t.index<e.index?-1:t.index>e.index?1:0}),this.gestures}},s.gestures=s.gestures||{},s.gestures.Hold={name:"hold",index:10,defaults:{hold_timeout:500,hold_threshold:1},timer:null,handler:function(t,e){switch(t.eventType){case s.EVENT_START:clearTimeout(this.timer),s.detection.current.name=this.name,this.timer=setTimeout(function(){"hold"==s.detection.current.name&&e.trigger("hold",t)},e.options.hold_timeout);break;case s.EVENT_MOVE:t.distance>e.options.hold_threshold&&clearTimeout(this.timer);break;case s.EVENT_END:clearTimeout(this.timer)}}},s.gestures.Tap={name:"tap",index:100,defaults:{tap_max_touchtime:250,tap_max_distance:10,tap_always:!0,doubletap_distance:20,doubletap_interval:300},handler:function(t,e){if(t.eventType==s.EVENT_END){var i=s.detection.previous,n=!1;if(t.deltaTime>e.options.tap_max_touchtime||t.distance>e.options.tap_max_distance)return;i&&"tap"==i.name&&t.timeStamp-i.lastEvent.timeStamp<e.options.doubletap_interval&&t.distance<e.options.doubletap_distance&&(e.trigger("doubletap",t),n=!0),(!n||e.options.tap_always)&&(s.detection.current.name="tap",e.trigger(s.detection.current.name,t))}}},s.gestures.Swipe={name:"swipe",index:40,defaults:{swipe_max_touches:1,swipe_velocity:.7},handler:function(t,e){if(t.eventType==s.EVENT_END){if(e.options.swipe_max_touches>0&&t.touches.length>e.options.swipe_max_touches)return;(t.velocityX>e.options.swipe_velocity||t.velocityY>e.options.swipe_velocity)&&(e.trigger(this.name,t),e.trigger(this.name+t.direction,t))}}},s.gestures.Drag={name:"drag",index:50,defaults:{drag_min_distance:10,drag_max_touches:1,drag_block_horizontal:!1,drag_block_vertical:!1,drag_lock_to_axis:!1,drag_lock_min_distance:25},triggered:!1,handler:function(t,e){if(s.detection.current.name!=this.name&&this.triggered)return e.trigger(this.name+"end",t),this.triggered=!1,void 0;if(!(e.options.drag_max_touches>0&&t.touches.length>e.options.drag_max_touches))switch(t.eventType){case s.EVENT_START:this.triggered=!1;break;case s.EVENT_MOVE:if(t.distance<e.options.drag_min_distance&&s.detection.current.name!=this.name)return;s.detection.current.name=this.name,(s.detection.current.lastEvent.drag_locked_to_axis||e.options.drag_lock_to_axis&&e.options.drag_lock_min_distance<=t.distance)&&(t.drag_locked_to_axis=!0);var i=s.detection.current.lastEvent.direction;t.drag_locked_to_axis&&i!==t.direction&&(t.direction=s.utils.isVertical(i)?t.deltaY<0?s.DIRECTION_UP:s.DIRECTION_DOWN:t.deltaX<0?s.DIRECTION_LEFT:s.DIRECTION_RIGHT),this.triggered||(e.trigger(this.name+"start",t),this.triggered=!0),e.trigger(this.name,t),e.trigger(this.name+t.direction,t),(e.options.drag_block_vertical&&s.utils.isVertical(t.direction)||e.options.drag_block_horizontal&&!s.utils.isVertical(t.direction))&&t.preventDefault();break;case 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diff --git a/docs/graph.html b/docs/graph.html
index 9d298eb1..2c679bc1 100644
--- a/docs/graph.html
+++ b/docs/graph.html
@@ -118,7 +118,7 @@
 </p>
 
 <pre class="prettyprint lang-html">
-&lt;script type="text/javascript" src="vis/vis.js"&gt;&lt;/script&gt;
+&lt;script type="text/javascript" src="vis/dist/vis.js"&gt;&lt;/script&gt;
 </pre>
 
 
