vis.js is a dynamic, browser-based visualization library
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var util = require('../../util');
var DOMutil = require('../../DOMutil');
var Component = require('./Component');
var DataStep = require('../DataStep');
/**
* A horizontal time axis
* @param {Object} [options] See DataAxis.setOptions for the available
* options.
* @constructor DataAxis
* @extends Component
* @param body
*/
function DataAxis (body, options, svg) {
this.id = util.randomUUID();
this.body = body;
this.defaultOptions = {
orientation: 'left', // supported: 'left', 'right'
showMinorLabels: true,
showMajorLabels: true,
icons: true,
majorLinesOffset: 7,
minorLinesOffset: 4,
labelOffsetX: 10,
labelOffsetY: 2,
iconWidth: 20,
width: '40px',
visible: true
};
this.linegraphSVG = svg;
this.props = {};
this.DOMelements = { // dynamic elements
lines: {},
labels: {}
};
this.dom = {};
this.range = {start:0, end:0};
this.options = util.extend({}, this.defaultOptions);
this.conversionFactor = 1;
this.setOptions(options);
this.width = Number(('' + this.options.width).replace("px",""));
this.minWidth = this.width;
this.height = this.linegraphSVG.offsetHeight;
this.stepPixels = 25;
this.stepPixelsForced = 25;
this.lineOffset = 0;
this.master = true;
this.svgElements = {};
this.groups = {};
this.amountOfGroups = 0;
// create the HTML DOM
this._create();
}
DataAxis.prototype = new Component();
DataAxis.prototype.addGroup = function(label, graphOptions) {
if (!this.groups.hasOwnProperty(label)) {
this.groups[label] = graphOptions;
}
this.amountOfGroups += 1;
};
DataAxis.prototype.updateGroup = function(label, graphOptions) {
this.groups[label] = graphOptions;
};
DataAxis.prototype.removeGroup = function(label) {
if (this.groups.hasOwnProperty(label)) {
delete this.groups[label];
this.amountOfGroups -= 1;
}
};
DataAxis.prototype.setOptions = function (options) {
if (options) {
var redraw = false;
if (this.options.orientation != options.orientation && options.orientation !== undefined) {
redraw = true;
}
var fields = [
'orientation',
'showMinorLabels',
'showMajorLabels',
'icons',
'majorLinesOffset',
'minorLinesOffset',
'labelOffsetX',
'labelOffsetY',
'iconWidth',
'width',
'visible'];
util.selectiveExtend(fields, this.options, options);
this.minWidth = Number(('' + this.options.width).replace("px",""));
if (redraw == true && this.dom.frame) {
this.hide();
this.show();
}
}
};
/**
* Create the HTML DOM for the DataAxis
*/
DataAxis.prototype._create = function() {
this.dom.frame = document.createElement('div');
this.dom.frame.style.width = this.options.width;
this.dom.frame.style.height = this.height;
this.dom.lineContainer = document.createElement('div');
this.dom.lineContainer.style.width = '100%';
this.dom.lineContainer.style.height = this.height;
// create svg element for graph drawing.
this.svg = document.createElementNS('http://www.w3.org/2000/svg',"svg");
this.svg.style.position = "absolute";
this.svg.style.top = '0px';
this.svg.style.height = '100%';
this.svg.style.width = '100%';
this.svg.style.display = "block";
this.dom.frame.appendChild(this.svg);
};
DataAxis.prototype._redrawGroupIcons = function () {
DOMutil.prepareElements(this.svgElements);
var x;
var iconWidth = this.options.iconWidth;
var iconHeight = 15;
var iconOffset = 4;
var y = iconOffset + 0.5 * iconHeight;
if (this.options.orientation == 'left') {
x = iconOffset;
}
else {
x = this.width - iconWidth - iconOffset;
}
for (var groupId in this.groups) {
if (this.groups.hasOwnProperty(groupId)) {
this.groups[groupId].drawIcon(x, y, this.svgElements, this.svg, iconWidth, iconHeight);
y += iconHeight + iconOffset;
}
}
DOMutil.cleanupElements(this.svgElements);
};
/**
* Create the HTML DOM for the DataAxis
*/
DataAxis.prototype.show = function() {
if (!this.dom.frame.parentNode) {
if (this.options.orientation == 'left') {
this.body.dom.left.appendChild(this.dom.frame);
}
else {
this.body.dom.right.appendChild(this.dom.frame);
}
}
if (!this.dom.lineContainer.parentNode) {
this.body.dom.backgroundHorizontal.appendChild(this.dom.lineContainer);
}
};
/**
* Create the HTML DOM for the DataAxis
*/
DataAxis.prototype.hide = function() {
if (this.dom.frame.parentNode) {
this.dom.frame.parentNode.removeChild(this.dom.frame);
}
if (this.dom.lineContainer.parentNode) {
this.dom.lineContainer.parentNode.removeChild(this.dom.lineContainer);
}
};
/**
* Set a range (start and end)
* @param end
* @param start
* @param end
*/
DataAxis.prototype.setRange = function (start, end) {
this.range.start = start;
this.range.end = end;
};
/**
* Repaint the component
* @return {boolean} Returns true if the component is resized
*/
DataAxis.prototype.redraw = function () {
var changeCalled = false;
if (this.amountOfGroups == 0) {
this.hide();
}
else {
this.show();
this.height = Number(this.linegraphSVG.style.height.replace("px",""));
// svg offsetheight did not work in firefox and explorer...
this.dom.lineContainer.style.height = this.height + 'px';
this.width = this.options.visible == true ? Number(('' + this.options.width).replace("px","")) : 0;
var props = this.props;
var frame = this.dom.frame;
// update classname
frame.className = 'dataaxis';
// calculate character width and height
this._calculateCharSize();
var orientation = this.options.orientation;
var showMinorLabels = this.options.showMinorLabels;
var showMajorLabels = this.options.showMajorLabels;
// determine the width and height of the elemens for the axis
props.minorLabelHeight = showMinorLabels ? props.minorCharHeight : 0;
props.majorLabelHeight = showMajorLabels ? props.majorCharHeight : 0;
props.minorLineWidth = this.body.dom.backgroundHorizontal.offsetWidth - this.lineOffset - this.width + 2 * this.options.minorLinesOffset;
props.minorLineHeight = 1;
props.majorLineWidth = this.body.dom.backgroundHorizontal.offsetWidth - this.lineOffset - this.width + 2 * this.options.majorLinesOffset;
props.majorLineHeight = 1;
// take frame offline while updating (is almost twice as fast)
if (orientation == 'left') {
frame.style.top = '0';
frame.style.left = '0';
frame.style.bottom = '';
frame.style.width = this.width + 'px';
frame.style.height = this.height + "px";
}
else { // right
frame.style.top = '';
frame.style.bottom = '0';
frame.style.left = '0';
frame.style.width = this.width + 'px';
frame.style.height = this.height + "px";
}
changeCalled = this._redrawLabels();
if (this.options.icons == true) {
this._redrawGroupIcons();
}
}
return changeCalled;
};
/**
* Repaint major and minor text labels and vertical grid lines
* @private
*/
DataAxis.prototype._redrawLabels = function () {
DOMutil.prepareElements(this.DOMelements);
var orientation = this.options['orientation'];
// calculate range and step (step such that we have space for 7 characters per label)
var minimumStep = this.master ? this.props.majorCharHeight || 10 : this.stepPixelsForced;
var step = new DataStep(this.range.start, this.range.end, minimumStep, this.dom.frame.offsetHeight);
this.step = step;
step.first();
// get the distance in pixels for a step
var stepPixels = this.dom.frame.offsetHeight / ((step.marginRange / step.step) + 1);
this.stepPixels = stepPixels;
var amountOfSteps = this.height / stepPixels;
var stepDifference = 0;
if (this.master == false) {
stepPixels = this.stepPixelsForced;
stepDifference = Math.round((this.height / stepPixels) - amountOfSteps);
for (var i = 0; i < 0.5 * stepDifference; i++) {
step.previous();
}
amountOfSteps = this.height / stepPixels;
}
this.valueAtZero = step.marginEnd;
var marginStartPos = 0;
// do not draw the first label
var max = 1;
step.next();
this.maxLabelSize = 0;
var y = 0;
while (max < Math.round(amountOfSteps)) {
y = Math.round(max * stepPixels);
marginStartPos = max * stepPixels;
var isMajor = step.isMajor();
if (this.options['showMinorLabels'] && isMajor == false || this.master == false && this.options['showMinorLabels'] == true) {
this._redrawLabel(y - 2, step.getCurrent(), orientation, 'yAxis minor', this.props.minorCharHeight);
}
if (isMajor && this.options['showMajorLabels'] && this.master == true ||
this.options['showMinorLabels'] == false && this.master == false && isMajor == true) {
if (y >= 0) {
this._redrawLabel(y - 2, step.getCurrent(), orientation, 'yAxis major', this.props.majorCharHeight);
}
this._redrawLine(y, orientation, 'grid horizontal major', this.options.majorLinesOffset, this.props.majorLineWidth);
}
else {
this._redrawLine(y, orientation, 'grid horizontal minor', this.options.minorLinesOffset, this.props.minorLineWidth);
}
step.next();
max++;
}
this.conversionFactor = marginStartPos/((amountOfSteps-1) * step.step);
var offset = this.options.icons == true ? this.options.iconWidth + this.options.labelOffsetX + 15 : this.options.labelOffsetX + 15;
// this will resize the yAxis to accomodate the labels.
if (this.maxLabelSize > (this.width - offset) && this.options.visible == true) {
this.width = this.maxLabelSize + offset;
this.options.width = this.width + "px";
DOMutil.cleanupElements(this.DOMelements);
this.redraw();
return true;
}
// this will resize the yAxis if it is too big for the labels.
else if (this.maxLabelSize < (this.width - offset) && this.options.visible == true && this.width > this.minWidth) {
this.width = Math.max(this.minWidth,this.maxLabelSize + offset);
this.options.width = this.width + "px";
DOMutil.cleanupElements(this.DOMelements);
this.redraw();
return true;
}
else {
DOMutil.cleanupElements(this.DOMelements);
return false;
}
};
/**
* Create a label for the axis at position x
* @private
* @param y
* @param text
* @param orientation
* @param className
* @param characterHeight
*/
DataAxis.prototype._redrawLabel = function (y, text, orientation, className, characterHeight) {
// reuse redundant label
var label = DOMutil.getDOMElement('div',this.DOMelements, this.dom.frame); //this.dom.redundant.labels.shift();
label.className = className;
label.innerHTML = text;
if (orientation == 'left') {
label.style.left = '-' + this.options.labelOffsetX + 'px';
label.style.textAlign = "right";
}
else {
label.style.right = '-' + this.options.labelOffsetX + 'px';
label.style.textAlign = "left";
}
label.style.top = y - 0.5 * characterHeight + this.options.labelOffsetY + 'px';
text += '';
var largestWidth = Math.max(this.props.majorCharWidth,this.props.minorCharWidth);
if (this.maxLabelSize < text.length * largestWidth) {
this.maxLabelSize = text.length * largestWidth;
}
};
/**
* Create a minor line for the axis at position y
* @param y
* @param orientation
* @param className
* @param offset
* @param width
*/
DataAxis.prototype._redrawLine = function (y, orientation, className, offset, width) {
if (this.master == true) {
var line = DOMutil.getDOMElement('div',this.DOMelements, this.dom.lineContainer);//this.dom.redundant.lines.shift();
line.className = className;
line.innerHTML = '';
if (orientation == 'left') {
line.style.left = (this.width - offset) + 'px';
}
else {
line.style.right = (this.width - offset) + 'px';
}
line.style.width = width + 'px';
line.style.top = y + 'px';
}
};
DataAxis.prototype.convertValue = function (value) {
var invertedValue = this.valueAtZero - value;
var convertedValue = invertedValue * this.conversionFactor;
return convertedValue; // the -2 is to compensate for the borders
};
/**
* Determine the size of text on the axis (both major and minor axis).
* The size is calculated only once and then cached in this.props.
* @private
*/
DataAxis.prototype._calculateCharSize = function () {
// determine the char width and height on the minor axis
if (!('minorCharHeight' in this.props)) {
var textMinor = document.createTextNode('0');
var measureCharMinor = document.createElement('DIV');
measureCharMinor.className = 'yAxis minor measure';
measureCharMinor.appendChild(textMinor);
this.dom.frame.appendChild(measureCharMinor);
this.props.minorCharHeight = measureCharMinor.clientHeight;
this.props.minorCharWidth = measureCharMinor.clientWidth;
this.dom.frame.removeChild(measureCharMinor);
}
if (!('majorCharHeight' in this.props)) {
var textMajor = document.createTextNode('0');
var measureCharMajor = document.createElement('DIV');
measureCharMajor.className = 'yAxis major measure';
measureCharMajor.appendChild(textMajor);
this.dom.frame.appendChild(measureCharMajor);
this.props.majorCharHeight = measureCharMajor.clientHeight;
this.props.majorCharWidth = measureCharMajor.clientWidth;
this.dom.frame.removeChild(measureCharMajor);
}
};
/**
* 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.
* @return {Date} snappedDate
*/
DataAxis.prototype.snap = function(date) {
return this.step.snap(date);
};
module.exports = DataAxis;