- Added animation and camera controls by the method .moveTo()

- Added new event that fires when the animation is finished.
- Added new example showing the new features of animation.

HISTORY.md

@@ -15,6 +15,9 @@ http://visjs.org
 - Implemented support for broken image fallback. Thanks @sfairgrieve.
 - Added multiline labels to edges as they are implemented in nodes. Updated 
   multiline example to show this.
+- Added animation and camera controls by the method .moveTo()
+- Added new event that fires when the animation is finished.
+- Added new example showing the new features of animation.
 
 ### Timeline
 

docs/network.html

@@ -2146,10 +2146,20 @@ var options: {
     </td>
   </tr>
   <tr>
-    <td>focusOnNode(nodeId, [zoomLevel])</td>
+    <td>focusOnNode(nodeId, [options])</td>
     <td>none</td>
-    <td>This function will move the view to center on the specified node. An optional zoomLevel can be passed where 1.0 is 100&#37;, between 0.0 and 1.0 is zooming out and > 1.0 is zooming in. Generally, close to 1.0 is sufficient.
-      If this argument is not passed the view will only move, not zoom.
+    <td>This function will move the view to center on the specified node. An optional options object can submitted where you can define the animation properties. <br />
+        The options that can be defined are:<br />
+        <b><code>scale:Number</code></b><br /> - to zoom to that scale,<br />
+        <b><code>offset:{x:Number, y:Number}</code></b><br /> - to offset the position from the center of the canvas (in DOM units),<br />
+        <b><code>animation: Object || Boolean</code></b><br /> - to define the specifics of the animation. True is animated with default settings, false is not animated.<br />
+        <br />
+        The animation object can consist of:<br />
+        <b><code>duration: Number</code></b><br /> - the duration of the animation in milliseconds,<br />
+        <b><code>easingFunction: String</code></b><br /> - the easing function of the animation, available are:<br />
+        <code>linear, easeInQuad, easeOutQuad, easeInOutQuad, easeInCubic, easeOutCubic, easeInOutCubic,
+            easeInQuart, easeOutQuart, easeInOutQuart,
+            easeInQuint, easeOutQuint, easeInOutQuint </code> <br /><br />
     </td>
   </tr>
   <tr>
@@ -2171,7 +2181,27 @@ var options: {
     <td>This function converts canvas coordinates to coordinates on the DOM. Input and output are in the form of {x:xpos,y:ypos}. The DOM values are relative to the network container.
     </td>
   </tr>
-  <tr>
+    <tr>
+        <td>moveTo(options)</td>
+        <td>object</td>
+        <td>This function allows you to programmatically move the view. The options that can be defined are:<br />
+            <b><code>position:{x:Number, y:Number}</code></b><br /> - to move to that position (in canvas units), <br />
+            <b><code>scale:Number</code></b><br /> - to zoom to that scale,<br />
+            <b><code>offset:{x:Number, y:Number}</code></b><br /> - to offset the position from the center of the canvas (in DOM units),<br />
+            <b><code>animation: Object || Boolean</code></b><br /> - to define the specifics of the animation.<br />
+            <br />
+            The animation object can consist of:<br />
+            <b><code>duration: Number</code></b><br /> - the duration of the animation in milliseconds,<br />
+            <b><code>easingFunction: String</code></b><br /> - the easing function of the animation, available are:<br />
+            <code>linear, easeInQuad, easeOutQuad, easeInOutQuad, easeInCubic, easeOutCubic, easeInOutCubic,
+            easeInQuart, easeOutQuart, easeInOutQuart,
+            easeInQuint, easeOutQuint, easeInOutQuint </code> <br /><br />
+
+            <i>You will have to define at least a scale or a position. Otherwise, there is nothing to move to.</i>
+        </td>
+    </tr>
+
+    <tr>
     <td>on(event, callback)</td>
     <td>none</td>
     <td>Create an event listener. The callback function is invoked every time the event is triggered. Avialable events: <code>select</code>. The callback function is invoked as <code>callback(properties)</code>, where <code>properties</code> is an object containing event specific properties. See section <a href="#Events">Events</a> for more information.</td>
@@ -2248,9 +2278,18 @@ var options: {
   </tr>
 
   <tr>
-    <td>zoomExtent()</td>
+    <td>zoomExtent([options])</td>
     <td>none</td>
-    <td>Scales the network so all the nodes are in center view.</td>
+    <td>Scales the network so all the nodes are in center view. Optionally you can supply options for animation. These
+    options can just be a boolean. When true, the zoom is animated, when false there is no animation.
+        Alternatively, you can supply an object.
+        <br /><br /> The object can consist of:<br />
+        <b><code>duration: Number</code></b><br /> - the duration of the animation in milliseconds,<br />
+        <b><code>easingFunction: String</code></b><br /> - the easing function of the animation, available are:<br />
+        <code>linear, easeInQuad, easeOutQuad, easeInOutQuad, easeInCubic, easeOutCubic, easeInOutCubic,
+            easeInQuart, easeOutQuart, easeInOutQuart,
+            easeInQuint, easeOutQuint, easeInOutQuint </code>
+    </td>
   </tr>
 
 </table>
@@ -2301,6 +2340,14 @@ network.off('select', onSelect);
     <th>Properties</th>
   </tr>
 
+  <tr>
+      <td>animationFinished</td>
+      <td>Fired after an animation is finished.
+      </td>
+      <td>
+          none
+      </td>
+  </tr>
   <tr>
     <td>select</td>
     <td>Fired after the user selects or deselects a node by clicking it.

examples/network/33_animation.html

@@ -0,0 +1,314 @@
+<!doctype html>
+<html>
+<head>
+  <title>Network | Animation</title>
+
+  <style type="text/css">
+    body {
+      font: 10pt sans;
+    }
+    #mynetwork {
+        width: 600px;
+        height: 600px;
+      border: 1px solid lightgray;
+    }
+
+      div.left {
+          position:relative;
+          float:left;
+          width:300px;
+          border: 1px #c7c7c7 solid;
+          height:590px;
+          padding:5px;
+      }
+
+      div.right {
+          padding-left:10px;
+          float:left;
+          width:600px;
+      }
+
+      div.bottom {
+          position:absolute;
+          bottom:5px;
+      }
+  </style>
+
+  <script type="text/javascript" src="../../dist/vis.js"></script>
+  <link href="../../dist/vis.css" rel="stylesheet" type="text/css" />
+
+  <script type="text/javascript">
+    var nodes = null;
+    var edges = null;
+    var network = null;
+
+    var doButton, focusButton, showButton;
+    var statusUpdateSpan;
+    var finishMessage = "";
+
+
+    function draw() {
+      statusUpdateSpan = document.getElementById("statusUpdate");
+      doButton = document.getElementById("btnDo");
+      focusButton = document.getElementById("btnFocus");
+      showButton = document.getElementById("btnShow");
+      nodes = [];
+      edges = [];
+      var connectionCount = [];
+
+      // randomly create some nodes and edges
+      var nodeCount = 25;
+      for (var i = 0; i < nodeCount; i++) {
+        nodes.push({
+          id: i,
+          label: String(i)
+        });
+
+        connectionCount[i] = 0;
+
+        // create edges in a scale-free-network way
+        if (i == 1) {
+          var from = i;
+          var to = 0;
+          edges.push({
+            from: from,
+            to: to
+          });
+          connectionCount[from]++;
+          connectionCount[to]++;
+        }
+        else if (i > 1) {
+          var conn = edges.length * 2;
+          var rand = Math.floor(Math.random() * conn);
+          var cum = 0;
+          var j = 0;
+          while (j < connectionCount.length && cum < rand) {
+            cum += connectionCount[j];
+            j++;
+          }
+
+
+          var from = i;
+          var to = j;
+          edges.push({
+            from: from,
+            to: to
+          });
+          connectionCount[from]++;
+          connectionCount[to]++;
+        }
+      }
+
+      // create a network
+      var container = document.getElementById('mynetwork');
+      var data = {
+        nodes: nodes,
+        edges: edges
+      };
+      var options = {};
+      network = new vis.Network(container, data, options);
+
+      // add event listeners
+      network.on('select', function(params) {
+        document.getElementById('selection').innerHTML = 'Selection: ' + params.nodes;
+      });
+      network.on('stabilized', function (params) {
+          document.getElementById('stabilization').innerHTML = 'Stabilization took ' + params.iterations + ' iterations.';
+      });
+      network.on("animationFinished", function() {
+          statusUpdateSpan.innerHTML = finishMessage;
+      })
+
+    }
+
+    function zoomExtentAnimated() {
+        var offsetx = parseInt(document.getElementById("offsetx").value);
+        var offsety = parseInt(document.getElementById("offsety").value);
+        var duration = parseInt(document.getElementById("duration").value);
+        var easingFunction = document.getElementById("easingFunction").value;
+
+        var options = {offset: {x:offsetx,y:offsety},
+            duration: duration,
+            easingFunction: easingFunction
+        }
+        statusUpdateSpan.innerHTML = "Doing ZoomExtent() Animation.";
+        finishMessage = "Animation finished."
+        network.zoomExtent(options);
+    }
+
+    function doDefaultAnimation() {
+        var offsetx = parseInt(document.getElementById("offsetx").value);
+        var offsety = parseInt(document.getElementById("offsety").value);
+        var scale = parseFloat(document.getElementById("scale").value);
+        var positionx = parseInt(document.getElementById("positionx").value);
+        var positiony = parseInt(document.getElementById("positiony").value);
+        var easingFunction = document.getElementById("easingFunction").value;
+
+        var options = {
+            position: {x:positionx,y:positiony},
+            scale: scale,
+            offset: {x:offsetx,y:offsety},
+            animation: true // default duration is 1000ms and default easingFunction is easeInOutQuad.
+        }
+        statusUpdateSpan.innerHTML = "Doing Animation.";
+        finishMessage = "Animation finished."
+        network.moveTo(options);
+    }
+
+    function doAnimation() {
+        var offsetx = parseInt(document.getElementById("offsetx").value);
+        var offsety = parseInt(document.getElementById("offsety").value);
+        var duration = parseInt(document.getElementById("duration").value);
+        var scale = parseFloat(document.getElementById("scale").value);
+        var positionx = parseInt(document.getElementById("positionx").value);
+        var positiony = parseInt(document.getElementById("positiony").value);
+        var easingFunction = document.getElementById("easingFunction").value;
+
+        var options = {
+            position: {x:positionx,y:positiony},
+            scale: scale,
+            offset: {x:offsetx,y:offsety},
+            animation: {
+                duration: duration,
+                easingFunction: easingFunction
+            }
+        }
+        statusUpdateSpan.innerHTML = "Doing Animation.";
+        finishMessage = "Animation finished."
+        network.moveTo(options);
+    }
+
+    function focusRandom() {
+        var nodeId = Math.floor(Math.random() * 25);
+        var offsetx = parseInt(document.getElementById("offsetx").value);
+        var offsety = parseInt(document.getElementById("offsety").value);
+        var duration = parseInt(document.getElementById("duration").value);
+        var scale = parseFloat(document.getElementById("scale").value);
+        var easingFunction = document.getElementById("easingFunction").value;
+
+        var options = {
+            // position: {x:positionx,y:positiony}, // this is not relevant when focusing on nodes
+            scale: scale,
+            offset: {x:offsetx,y:offsety},
+            animation: {
+                duration: duration,
+                easingFunction: easingFunction
+            }
+        }
+        statusUpdateSpan.innerHTML = "Focusing on node: " + nodeId;
+        finishMessage = "Node: " + nodeId + " in focus.";
+        network.focusOnNode(nodeId, options);
+    }
+
+
+    var showInterval = false;
+    var showPhase = 1;
+    function startShow() {
+        if (showInterval !== false) {
+            showInterval = false;
+            showButton.value = "Start a show!";
+            network.zoomExtent();
+        }
+        else {
+            showButton.value = "Stop the show!";
+            var duration = parseInt(document.getElementById("duration").value);
+            focusRandom();
+            window.setTimeout(doTheShow, duration);
+            showInterval = true;
+        }
+    }
+
+    function doTheShow() {
+        if (showInterval == true) {
+            var duration = parseInt(document.getElementById("duration").value);
+            if (showPhase == 0) {
+                focusRandom();
+                showPhase = 1;
+            }
+            else {
+                zoomExtentAnimated();
+                showPhase = 0;
+            }
+            window.setTimeout(doTheShow, duration);
+        }
+    }
+  </script>
+</head>
+
+<body onload="draw();">
+<h2>Camera animations</h2>
+<div style="width:700px; font-size:14px;">
+    You can move the view around programmatically using the .moveTo(options) function. The options supplied to this function can
+    also be (partially) supplied to the zoomExtent() function
+</div>
+<pre>
+var moveToOptions = {
+    position: {x:x, y:x},    // position to animate to (Numbers)
+    scale: 1.0,              // scale to animate to  (Number)
+    offset: {x:x, y:y},      // offset from the center in DOM pixels (Numbers)
+    animation: {             // animation object, can also be Boolean
+      duration: 1000,                 // animation duration in milliseconds (Number)
+      easingFunction: "easeInOutQuad" // Animation easing function, available are:
+    }                                   // linear, easeInQuad, easeOutQuad, easeInOutQuad,
+}                                       // easeInCubic, easeOutCubic, easeInOutCubic,
+                                        // easeInQuart, easeOutQuart, easeInOutQuart,
+                                        // easeInQuint, easeOutQuint, easeInOutQuint
+</pre>
+<div class="left">
+    <table>
+        <tr>
+            <td>position x</td><td><input type="text" value="300" id="positionx" style="width:170px;"></td>
+        </tr>
+        <tr>
+            <td>position y</td><td><input type="text" value="300" id="positiony" style="width:170px;"></td>
+        </tr>
+        <tr>
+            <td>scale</td><td><input type="text" value="1.0" id="scale" style="width:170px;"></td>
+        </tr>
+        <tr>
+            <td>offset x</td><td><input type="text" value="0" id="offsetx" style="width:170px;"> px</td>
+        </tr>
+        <tr>
+            <td>offset y</td><td><input type="text" value="0" id="offsety" style="width:170px;"> px</td>
+        </tr>
+        <tr>
+            <td>duration</td><td><input type="text" value="2500" id="duration" style="width:170px;"> ms</td>
+        </tr>
+        <tr>
+            <td>easingFunction</td><td>
+            <select id="easingFunction" style="width:174px;">
+                <option value="linear">linear</option>
+                <option value="easeInQuad">easeInQuad</option>
+                <option value="easeOutQuad">easeOutQuad</option>
+                <option value="easeInOutQuad" selected="selected">easeInOutQuad</option>
+                <option value="easeInCubic">easeInCubic</option>
+                <option value="easeOutCubic">easeOutCubic</option>
+                <option value="easeInOutCubic">easeInOutCubic</option>
+                <option value="easeInQuart">easeInQuart</option>
+                <option value="easeOutQuart">easeOutQuart</option>
+                <option value="easeInOutQuart">easeInOutQuart</option>
+                <option value="easeInQuint">easeInQuint</option>
+                <option value="easeOutQuint">easeOutQuint</option>
+                <option value="easeInOutQuint">easeInOutQuint</option>
+            </select>
+        </td>
+        </tr>
+    </table>
+    <div class="bottom">
+        <span id="statusUpdate"></span><br />
+        Examples:
+        <input type="button" onclick="doAnimation();" value="Animate with above settings." style="width:300px;" id="btnDo"> <br/>
+        <input type="button" onclick="doDefaultAnimation();" value="Animate with default settings." style="width:300px;" id="btnDoDefault"> <br/>
+        <input type="button" onclick="zoomExtentAnimated();" value="Animated ZoomExtent()." style="width:300px;" id="btnZoom"> <br/>
+        <input type="button" onclick="focusRandom();" value="Focus on random node." style="width:300px;" id="btnFocus"><br/>
+        <input type="button" onclick="startShow();" value="Start a show!" style="width:300px;" id="btnShow"><br/>
+    </div>
+</div>
+<div class="right">
+<div id="mynetwork"></div>
+
+<p id="selection"></p>
+<p id="stabilization"></p>
+</div>
+</body>
+</html>

examples/network/index.html

@@ -43,6 +43,8 @@
   <p><a href="29_neighbourhood_highlight.html">29_neighbourhood_highlight.html</a></p>
   <p><a href="30_importing_from_gephi.html">30_importing_from_gephi.html</a></p>
   <p><a href="31_localization.html">31_localization.html</a></p>
+  <p><a href="32_hierarchicaLayoutMethods.html">32_hierarchicaLayoutMethods.html</a></p>
+  <p><a href="33_animation.html">33_animation.html</a></p>
   <p><a href="graphviz/graphviz_gallery.html">graphviz_gallery.html</a></p>
 
 </div>

lib/network/Network.js

@@ -219,6 +219,15 @@ function Network (container, data, options) {
   this.hoverObj = {nodes:{},edges:{}};
   this.controlNodesActive = false;
 
+  // animation properties
+  this.animationSpeed = 1/this.renderRefreshRate;
+  this.animationEasingFunction = "easeInOutQuint";
+  this.easingTime = 0;
+  this.sourceScale = 0;
+  this.targetScale = 0;
+  this.sourceTranslation = 0;
+  this.targetTranslation = 0;
+
   // Node variables
   var network = this;
   this.groups = new Groups(); // object with groups
@@ -246,6 +255,66 @@ function Network (container, data, options) {
   // load the selection system. (mandatory, required by Network)
   this._loadHierarchySystem();
 
+  /*
+   * Easing Functions - inspired from http://gizma.com/easing/
+   * only considering the t value for the range [0, 1] => [0, 1]
+   * https://gist.github.com/gre/1650294
+   */
+  this.easingFunctions = {
+    // no easing, no acceleration
+    linear: function (t) {
+      return t
+    },
+    // accelerating from zero velocity
+    easeInQuad: function (t) {
+      return t * t
+    },
+    // decelerating to zero velocity
+    easeOutQuad: function (t) {
+      return t * (2 - t)
+    },
+    // acceleration until halfway, then deceleration
+    easeInOutQuad: function (t) {
+      return t < .5 ? 2 * t * t : -1 + (4 - 2 * t) * t
+    },
+    // accelerating from zero velocity
+    easeInCubic: function (t) {
+      return t * t * t
+    },
+    // decelerating to zero velocity
+    easeOutCubic: function (t) {
+      return (--t) * t * t + 1
+    },
+    // acceleration until halfway, then deceleration
+    easeInOutCubic: function (t) {
+      return t < .5 ? 4 * t * t * t : (t - 1) * (2 * t - 2) * (2 * t - 2) + 1
+    },
+    // accelerating from zero velocity
+    easeInQuart: function (t) {
+      return t * t * t * t
+    },
+    // decelerating to zero velocity
+    easeOutQuart: function (t) {
+      return 1 - (--t) * t * t * t
+    },
+    // acceleration until halfway, then deceleration
+    easeInOutQuart: function (t) {
+      return t < .5 ? 8 * t * t * t * t : 1 - 8 * (--t) * t * t * t
+    },
+    // accelerating from zero velocity
+    easeInQuint: function (t) {
+      return t * t * t * t * t
+    },
+    // decelerating to zero velocity
+    easeOutQuint: function (t) {
+      return 1 + (--t) * t * t * t * t
+    },
+    // acceleration until halfway, then deceleration
+    easeInOutQuint: function (t) {
+      return t < .5 ? 16 * t * t * t * t * t : 1 + 16 * (--t) * t * t * t * t
+    }
+  };
+
   // apply options
   this._setTranslation(this.frame.clientWidth / 2, this.frame.clientHeight / 2);
   this._setScale(1);
@@ -321,7 +390,7 @@ function Network (container, data, options) {
   else {
     // zoom so all data will fit on the screen, if clustering is enabled, we do not want start to be called here.
     if (this.constants.stabilize == false) {
-      this.zoomExtent(true,this.constants.clustering.enabled);
+      this.zoomExtent(undefined, true,this.constants.clustering.enabled);
     }
   }
 
@@ -396,7 +465,7 @@ Network.prototype._findCenter = function(range) {
  *
  * @param {object} range = {minX: minX, maxX: maxX, minY: minY, maxY: maxY};
  */
-Network.prototype._centerNetwork = function(range) {
+Network.prototype._getNetworkCenter = function(range) {
   var center = this._findCenter(range);
 
   center.x *= this.scale;
@@ -404,7 +473,7 @@ Network.prototype._centerNetwork = function(range) {
   center.x -= 0.5 * this.frame.canvas.clientWidth;
   center.y -= 0.5 * this.frame.canvas.clientHeight;
 
-  this._setTranslation(-center.x,-center.y); // set at 0,0
+  return {x:-center.x,y:-center.y};
 };
 
 
@@ -414,15 +483,19 @@ Network.prototype._centerNetwork = function(range) {
  * @param {Boolean} [initialZoom]  | zoom based on fitted formula or range, true = fitted, default = false;
  * @param {Boolean} [disableStart] | If true, start is not called.
  */
-Network.prototype.zoomExtent = function(initialZoom, disableStart) {
+Network.prototype.zoomExtent = function(animationOptions, initialZoom, disableStart) {
   if (initialZoom === undefined) {
     initialZoom = false;
   }
   if (disableStart === undefined) {
     disableStart = false;
   }
+  if (animationOptions === undefined) {
+    animationOptions = false;
+  }
 
   var range = this._getRange();
+  var scale = this._getScale();
   var zoomLevel;
 
   if (initialZoom == true) {
@@ -466,11 +539,17 @@ Network.prototype.zoomExtent = function(initialZoom, disableStart) {
 
 
   this._setScale(zoomLevel);
-  this._centerNetwork(range);
+  var center = this._getNetworkCenter(range);
   if (disableStart == false) {
+    this._setScale(scale);
+    var options = {targetTranslation: center, scale: zoomLevel, animation: animationOptions};
+    this.moveTo(options);
     this.moving = true;
     this.start();
   }
+  else {
+    this._setTranslation(center.x,center.y);
+  }
 };
 
 
@@ -1804,9 +1883,9 @@ Network.prototype._YconvertCanvasToDOM = function(y) {
  * @returns {{x: number, y: number}}
  * @constructor
  */
-Network.prototype.canvasToDOM = function(pos) {
-  return {x:this._XconvertCanvasToDOM(pos.x),y:this._YconvertCanvasToDOM(pos.y)};
-}
+Network.prototype.canvasToDOM = function (pos) {
+  return {x: this._XconvertCanvasToDOM(pos.x), y: this._YconvertCanvasToDOM(pos.y)};
+};
 
 /**
  *
@@ -1814,9 +1893,9 @@ Network.prototype.canvasToDOM = function(pos) {
  * @returns {{x: number, y: number}}
  * @constructor
  */
-Network.prototype.DOMtoCanvas = function(pos) {
-  return {x:this._XconvertDOMtoCanvas(pos.x),y:this._YconvertDOMtoCanvas(pos.y)};
-}
+Network.prototype.DOMtoCanvas = function (pos) {
+  return {x: this._XconvertDOMtoCanvas(pos.x), y: this._YconvertDOMtoCanvas(pos.y)};
+};
 
 /**
  * Redraw all nodes
@@ -1905,7 +1984,7 @@ Network.prototype._stabilize = function() {
     this._physicsTick();
     count++;
   }
-  this.zoomExtent(false,true);
+  this.zoomExtent(undefined,false,true);
   if (this.constants.freezeForStabilization == true) {
     this._restoreFrozenNodes();
   }
@@ -2258,33 +2337,143 @@ Network.prototype.storePosition = function() {
  * Center a node in view.
  *
  * @param {Number} nodeId
- * @param {Number} [zoomLevel]
+ * @param {Number} [options]
  */
-Network.prototype.focusOnNode = function (nodeId, zoomLevel) {
+Network.prototype.focusOnNode = function (nodeId, options) {
   if (this.nodes.hasOwnProperty(nodeId)) {
-    if (zoomLevel === undefined) {
-      zoomLevel = this._getScale();
+    if (options === undefined) {
+      options = {};
     }
-    var nodePosition= {x: this.nodes[nodeId].x, y: this.nodes[nodeId].y};
+    var nodePosition = {x: this.nodes[nodeId].x, y: this.nodes[nodeId].y};
+    options.position = nodePosition;
+
+    this.moveTo(options)
+  }
+  else {
+    console.log("This nodeId cannot be found.");
+  }
+};
 
-    var requiredScale = zoomLevel;
-    this._setScale(requiredScale);
+/**
+ *
+ * @param {Object} options  |  options.offset   = {x:Number, y:Number}   // offset from the center in DOM pixels
+ *                          |  options.scale    = Number                 // scale to move to
+ *                          |  options.position = {x:Number, y:Number}   // position to move to
+ *                          |  options.animation = {duration:Number, easingFunction:String} || Boolean   // position to move to
+ */
+Network.prototype.moveTo = function (options) {
+  if (options === undefined) {
+    options = {};
+    return;
+  }
+  if (options.offset    === undefined)           {options.offset    = {x: 0, y: 0};          }
+  if (options.offset.x  === undefined)           {options.offset.x  = 0;                     }
+  if (options.offset.y  === undefined)           {options.offset.y  = 0;                     }
+  if (options.scale     === undefined)           {options.scale     = this._getScale();      }
+  if (options.position  === undefined)           {options.position  = this._getTranslation();}
+  if (options.animation === undefined)           {options.animation = {duration:0};          }
+  if (options.animation === false    )           {options.animation = {duration:0};          }
+  if (options.animation === true     )           {options.animation = {};                    }
+  if (options.animation.duration === undefined)  {options.animation.duration = 1000;         }  // default duration
+  if (options.animation.easingFunction === undefined)  {options.animation.easingFunction = "easeInOutQuad";  } // default easing function
 
-    var canvasCenter = this.DOMtoCanvas({x:0.5 * this.frame.canvas.width,y:0.5 * this.frame.canvas.height});
-    var translation = this._getTranslation();
+  this.animateView(options);
+};
 
-    var distanceFromCenter = {x:canvasCenter.x - nodePosition.x,
-                              y:canvasCenter.y - nodePosition.y};
+/**
+ *
+ * @param {Object} options  |  options.offset   = {x:Number, y:Number}   // offset from the center in DOM pixels
+ *                          |  options.time     = Number                 // animation time in milliseconds
+ *                          |  options.scale    = Number                 // scale to animate to
+ *                          |  options.position = {x:Number, y:Number}   // position to animate to
+ *                          |  options.easingFunction = String           // linear, easeInQuad, easeOutQuad, easeInOutQuad,
+ *                                                                       // easeInCubic, easeOutCubic, easeInOutCubic,
+ *                                                                       // easeInQuart, easeOutQuart, easeInOutQuart,
+ *                                                                       // easeInQuint, easeOutQuint, easeInOutQuint
+ */
+Network.prototype.animateView = function (options) {
+  if (options === undefined) {
+    options = {};
+    return;
+  }
 
-    this._setTranslation(translation.x + requiredScale * distanceFromCenter.x,
-                         translation.y + requiredScale * distanceFromCenter.y);
-    this.redraw();
+  // forcefully complete the old animation if it was still running
+  if (this.easingTime != 0) {
+    this._transitionRedraw(1); // by setting easingtime to 1, we finish the animation.
+  }
+
+  this.sourceScale = this._getScale();
+  this.sourceTranslation = this._getTranslation();
+  this.targetScale = options.scale;
+
+  // directly supplying the target translation can be useful when using internally, like with zoomExtent()
+  if (options.targetTranslation !== undefined) {
+    this.targetTranslation = options.targetTranslation;
   }
   else {
-    console.log("This nodeId cannot be found.");
+    // set the scale so the viewCenter is based on the correct zoom level. This is overridden in the transitionRedraw
+    // but at least then we'll have the target transition
+    this._setScale(this.targetScale);
+    var viewCenter = this.DOMtoCanvas({x: 0.5 * this.frame.canvas.clientWidth, y: 0.5 * this.frame.canvas.clientHeight});
+    var distanceFromCenter = { // offset from view, distance view has to change by these x and y to center the node
+      x: viewCenter.x - options.position.x,
+      y: viewCenter.y - options.position.y
+    };
+    this.targetTranslation = {
+      x: this.sourceTranslation.x + distanceFromCenter.x * this.targetScale + options.offset.x,
+      y: this.sourceTranslation.y + distanceFromCenter.y * this.targetScale + options.offset.y
+    };
+  }
+
+  // if the time is set to 0, don't do an animation
+  if (options.animation.duration == 0) {
+    this._setScale(this.targetScale);
+    this._setTranslation(this.targetTranslation.x, this.targetTranslation.y);
+    this._redraw();
+  }
+  else {
+    this.animationSpeed = 1 / (this.renderRefreshRate * options.animation.duration * 0.001) || 1 / this.renderRefreshRate;
+    this.animationEasingFunction = options.animation.easingFunction;
+    this._classicRedraw = this._redraw;
+    this._redraw = this._transitionRedraw;
+    this.moving = true;
+    this.start();
+  }
+};
+
+
+/**
+ *
+ * @param easingTime
+ * @private
+ */
+Network.prototype._transitionRedraw = function (easingTime) {
+  this.easingTime = easingTime || this.easingTime + this.animationSpeed;
+  this.easingTime += this.animationSpeed;
+
+  var progress = this.easingFunctions[this.animationEasingFunction](this.easingTime);
+
+  this._setScale(this.sourceScale + (this.targetScale - this.sourceScale) * progress);
+  this._setTranslation(
+    this.sourceTranslation.x + (this.targetTranslation.x - this.sourceTranslation.x) * progress,
+    this.sourceTranslation.y + (this.targetTranslation.y - this.sourceTranslation.y) * progress
+  );
+
+  this._classicRedraw();
+  this.moving = true;
+
+  // cleanup
+  if (this.easingTime >= 1.0) {
+    this.easingTime = 0;
+    this._redraw = this._classicRedraw;
+    this.emit("animationFinished");
   }
 };
 
+Network.prototype._classicRedraw = function () {
+  // placeholder function to be overloaded by animations;
+};
+
 /**
  * Returns true when the Timeline is active.
  * @returns {boolean}
@@ -2293,4 +2482,6 @@ Network.prototype.isActive = function () {
   return !this.activator || this.activator.active;
 };
 
+
+
 module.exports = Network;

lib/network/mixins/HierarchicalLayoutMixin.js

@@ -59,7 +59,7 @@ exports._setupHierarchicalLayout = function() {
     // if the user defined some levels but not all, alert and run without hierarchical layout
     if (undefinedLevel == true && definedLevel == true) {
       throw new Error("To use the hierarchical layout, nodes require either no predefined levels or levels have to be defined for all nodes.");
-      this.zoomExtent(true,this.constants.clustering.enabled);
+      this.zoomExtent(undefined,true,this.constants.clustering.enabled);
       if (!this.constants.clustering.enabled) {
         this.start();
       }