mirror of
https://github.com/chartjs/Chart.js.git
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1189 lines
47 KiB
JavaScript
Executable File
1189 lines
47 KiB
JavaScript
Executable File
/*!
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* Chart.js
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* http://chartjs.org/
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* Version: {{ version }}
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*
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* Copyright 2015 Nick Downie
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* Released under the MIT license
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* https://github.com/nnnick/Chart.js/blob/master/LICENSE.md
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*/
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(function() {
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"use strict";
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//Declare root variable - window in the browser, global on the server
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var root = this,
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previous = root.Chart;
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//Occupy the global variable of Chart, and create a simple base class
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var Chart = function(context) {
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var chart = this;
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this.canvas = context.canvas;
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this.ctx = context;
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//Variables global to the chart
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var computeDimension = function(element, dimension) {
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if (element['offset' + dimension]) {
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return element['offset' + dimension];
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} else {
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return document.defaultView.getComputedStyle(element).getPropertyValue(dimension);
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}
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};
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var width = this.width = computeDimension(context.canvas, 'Width') || context.canvas.width;
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var height = this.height = computeDimension(context.canvas, 'Height') || context.canvas.height;
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// Firefox requires this to work correctly
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context.canvas.width = width;
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context.canvas.height = height;
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width = this.width = context.canvas.width;
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height = this.height = context.canvas.height;
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this.aspectRatio = this.width / this.height;
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//High pixel density displays - multiply the size of the canvas height/width by the device pixel ratio, then scale.
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helpers.retinaScale(this);
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return this;
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};
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var defaultColor = 'rgba(0,0,0,0.1)';
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//Globally expose the defaults to allow for user updating/changing
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Chart.defaults = {
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global: {
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responsive: true,
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maintainAspectRatio: true,
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events: ["mousemove", "mouseout", "click", "touchstart", "touchmove", "touchend"],
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hover: {
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onHover: null,
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mode: 'single',
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animationDuration: 400,
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},
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onClick: null,
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defaultColor: defaultColor,
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// Element defaults defined in element extensions
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elements: {}
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},
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};
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//Create a dictionary of chart types, to allow for extension of existing types
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Chart.types = {};
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//Global Chart helpers object for utility methods and classes
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var helpers = Chart.helpers = {};
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//-- Basic js utility methods
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var each = helpers.each = function(loopable, callback, self) {
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var additionalArgs = Array.prototype.slice.call(arguments, 3);
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// Check to see if null or undefined firstly.
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if (loopable) {
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if (loopable.length === +loopable.length) {
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var i;
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for (i = 0; i < loopable.length; i++) {
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callback.apply(self, [loopable[i], i].concat(additionalArgs));
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}
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} else {
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for (var item in loopable) {
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callback.apply(self, [loopable[item], item].concat(additionalArgs));
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}
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}
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}
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},
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clone = helpers.clone = function(obj) {
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var objClone = {};
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each(obj, function(value, key) {
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if (obj.hasOwnProperty(key)) {
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objClone[key] = value;
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}
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});
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return objClone;
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},
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extend = helpers.extend = function(base) {
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each(Array.prototype.slice.call(arguments, 1), function(extensionObject) {
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each(extensionObject, function(value, key) {
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if (extensionObject.hasOwnProperty(key)) {
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base[key] = value;
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}
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});
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});
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return base;
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},
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merge = helpers.merge = function(base, master) {
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//Merge properties in left object over to a shallow clone of object right.
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var args = Array.prototype.slice.call(arguments, 0);
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args.unshift({});
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return extend.apply(null, args);
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},
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// Need a special merge function to chart configs since they are now grouped
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configMerge = helpers.configMerge = function(_base) {
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var base = clone(_base);
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helpers.each(Array.prototype.slice.call(arguments, 1), function(extension) {
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helpers.each(extension, function(value, key) {
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if (extension.hasOwnProperty(key)) {
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if (base.hasOwnProperty(key) && helpers.isArray(base[key]) && helpers.isArray(value)) {
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// In this case we have an array of objects replacing another array. Rather than doing a strict replace,
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// merge. This allows easy scale option merging
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var baseArray = base[key];
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helpers.each(value, function(valueObj, index) {
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if (index < baseArray.length) {
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baseArray[index] = helpers.configMerge(baseArray[index], valueObj);
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} else {
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baseArray.push(valueObj); // nothing to merge
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}
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});
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} else if (base.hasOwnProperty(key) && typeof base[key] == "object" && base[key] !== null && typeof value == "object") {
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// If we are overwriting an object with an object, do a merge of the properties.
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base[key] = helpers.configMerge(base[key], value);
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} else {
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// can just overwrite the value in this case
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base[key] = value;
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}
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}
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});
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});
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return base;
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},
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getValueAtIndexOrDefault = helpers.getValueAtIndexOrDefault = function(value, index, defaultValue) {
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if (!value) {
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return defaultValue;
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}
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if (helpers.isArray(value) && index < value.length) {
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return value[index];
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}
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return value;
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},
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indexOf = helpers.indexOf = function(arrayToSearch, item) {
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if (Array.prototype.indexOf) {
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return arrayToSearch.indexOf(item);
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} else {
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for (var i = 0; i < arrayToSearch.length; i++) {
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if (arrayToSearch[i] === item) return i;
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}
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return -1;
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}
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},
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where = helpers.where = function(collection, filterCallback) {
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var filtered = [];
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helpers.each(collection, function(item) {
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if (filterCallback(item)) {
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filtered.push(item);
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}
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});
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return filtered;
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},
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findNextWhere = helpers.findNextWhere = function(arrayToSearch, filterCallback, startIndex) {
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// Default to start of the array
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if (!startIndex) {
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startIndex = -1;
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}
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for (var i = startIndex + 1; i < arrayToSearch.length; i++) {
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var currentItem = arrayToSearch[i];
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if (filterCallback(currentItem)) {
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return currentItem;
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}
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}
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},
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findPreviousWhere = helpers.findPreviousWhere = function(arrayToSearch, filterCallback, startIndex) {
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// Default to end of the array
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if (!startIndex) {
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startIndex = arrayToSearch.length;
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}
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for (var i = startIndex - 1; i >= 0; i--) {
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var currentItem = arrayToSearch[i];
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if (filterCallback(currentItem)) {
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return currentItem;
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}
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}
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},
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inherits = helpers.inherits = function(extensions) {
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//Basic javascript inheritance based on the model created in Backbone.js
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var parent = this;
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var ChartElement = (extensions && extensions.hasOwnProperty("constructor")) ? extensions.constructor : function() {
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return parent.apply(this, arguments);
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};
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var Surrogate = function() {
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this.constructor = ChartElement;
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};
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Surrogate.prototype = parent.prototype;
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ChartElement.prototype = new Surrogate();
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ChartElement.extend = inherits;
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if (extensions) extend(ChartElement.prototype, extensions);
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ChartElement.__super__ = parent.prototype;
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return ChartElement;
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},
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noop = helpers.noop = function() {},
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uid = helpers.uid = (function() {
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var id = 0;
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return function() {
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return "chart-" + id++;
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};
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})(),
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warn = helpers.warn = function(str) {
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//Method for warning of errors
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if (window.console && typeof window.console.warn === "function") console.warn(str);
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},
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amd = helpers.amd = (typeof define === 'function' && define.amd),
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//-- Math methods
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isNumber = helpers.isNumber = function(n) {
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return !isNaN(parseFloat(n)) && isFinite(n);
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},
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max = helpers.max = function(array) {
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return Math.max.apply(Math, array);
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},
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min = helpers.min = function(array) {
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return Math.min.apply(Math, array);
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},
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sign = helpers.sign = function(x) {
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if (Math.sign) {
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return Math.sign(x);
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} else {
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x = +x; // convert to a number
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if (x === 0 || isNaN(x)) {
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return x;
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}
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return x > 0 ? 1 : -1;
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}
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},
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log10 = helpers.log10 = function(x) {
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if (Math.log10) {
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return Math.log10(x)
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} else {
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return Math.log(x) / Math.LN10;
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}
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},
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cap = helpers.cap = function(valueToCap, maxValue, minValue) {
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if (isNumber(maxValue)) {
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if (valueToCap > maxValue) {
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return maxValue;
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}
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} else if (isNumber(minValue)) {
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if (valueToCap < minValue) {
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return minValue;
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}
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}
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return valueToCap;
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},
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getDecimalPlaces = helpers.getDecimalPlaces = function(num) {
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if (num % 1 !== 0 && isNumber(num)) {
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var s = num.toString();
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if (s.indexOf("e-") < 0) {
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// no exponent, e.g. 0.01
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return s.split(".")[1].length;
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} else if (s.indexOf(".") < 0) {
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// no decimal point, e.g. 1e-9
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return parseInt(s.split("e-")[1]);
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} else {
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// exponent and decimal point, e.g. 1.23e-9
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var parts = s.split(".")[1].split("e-");
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return parts[0].length + parseInt(parts[1]);
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}
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} else {
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return 0;
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}
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},
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toRadians = helpers.toRadians = function(degrees) {
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return degrees * (Math.PI / 180);
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},
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toDegrees = helpers.toDegrees = function(radians) {
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return radians * (180 / Math.PI);
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},
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// Gets the angle from vertical upright to the point about a centre.
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getAngleFromPoint = helpers.getAngleFromPoint = function(centrePoint, anglePoint) {
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var distanceFromXCenter = anglePoint.x - centrePoint.x,
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distanceFromYCenter = anglePoint.y - centrePoint.y,
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radialDistanceFromCenter = Math.sqrt(distanceFromXCenter * distanceFromXCenter + distanceFromYCenter * distanceFromYCenter);
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var angle = Math.atan2(distanceFromYCenter, distanceFromXCenter);
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if (angle < (-0.5 * Math.PI)) {
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angle += 2.0 * Math.PI; // make sure the returned angle is in the range of (-PI/2, 3PI/2]
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}
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return {
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angle: angle,
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distance: radialDistanceFromCenter
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};
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},
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aliasPixel = helpers.aliasPixel = function(pixelWidth) {
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return (pixelWidth % 2 === 0) ? 0 : 0.5;
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},
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splineCurve = helpers.splineCurve = function(FirstPoint, MiddlePoint, AfterPoint, t) {
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//Props to Rob Spencer at scaled innovation for his post on splining between points
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//http://scaledinnovation.com/analytics/splines/aboutSplines.html
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var d01 = Math.sqrt(Math.pow(MiddlePoint.x - FirstPoint.x, 2) + Math.pow(MiddlePoint.y - FirstPoint.y, 2)),
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d12 = Math.sqrt(Math.pow(AfterPoint.x - MiddlePoint.x, 2) + Math.pow(AfterPoint.y - MiddlePoint.y, 2)),
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fa = t * d01 / (d01 + d12), // scaling factor for triangle Ta
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fb = t * d12 / (d01 + d12);
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return {
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previous: {
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x: MiddlePoint.x - fa * (AfterPoint.x - FirstPoint.x),
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y: MiddlePoint.y - fa * (AfterPoint.y - FirstPoint.y)
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},
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next: {
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x: MiddlePoint.x + fb * (AfterPoint.x - FirstPoint.x),
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y: MiddlePoint.y + fb * (AfterPoint.y - FirstPoint.y)
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}
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};
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},
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calculateOrderOfMagnitude = helpers.calculateOrderOfMagnitude = function(val) {
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return Math.floor(Math.log(val) / Math.LN10);
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},
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calculateScaleRange = helpers.calculateScaleRange = function(valuesArray, drawingSize, textSize, startFromZero, integersOnly) {
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//Set a minimum step of two - a point at the top of the graph, and a point at the base
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var minSteps = 2,
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maxSteps = Math.floor(drawingSize / (textSize * 1.5)),
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skipFitting = (minSteps >= maxSteps);
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var maxValue = max(valuesArray),
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minValue = min(valuesArray);
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// We need some degree of seperation here to calculate the scales if all the values are the same
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// Adding/minusing 0.5 will give us a range of 1.
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if (maxValue === minValue) {
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maxValue += 0.5;
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// So we don't end up with a graph with a negative start value if we've said always start from zero
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if (minValue >= 0.5 && !startFromZero) {
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minValue -= 0.5;
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} else {
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// Make up a whole number above the values
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maxValue += 0.5;
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}
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}
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var valueRange = Math.abs(maxValue - minValue),
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rangeOrderOfMagnitude = calculateOrderOfMagnitude(valueRange),
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graphMax = Math.ceil(maxValue / (1 * Math.pow(10, rangeOrderOfMagnitude))) * Math.pow(10, rangeOrderOfMagnitude),
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graphMin = (startFromZero) ? 0 : Math.floor(minValue / (1 * Math.pow(10, rangeOrderOfMagnitude))) * Math.pow(10, rangeOrderOfMagnitude),
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graphRange = graphMax - graphMin,
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stepValue = Math.pow(10, rangeOrderOfMagnitude),
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numberOfSteps = Math.round(graphRange / stepValue);
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//If we have more space on the graph we'll use it to give more definition to the data
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while ((numberOfSteps > maxSteps || (numberOfSteps * 2) < maxSteps) && !skipFitting) {
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if (numberOfSteps > maxSteps) {
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stepValue *= 2;
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numberOfSteps = Math.round(graphRange / stepValue);
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// Don't ever deal with a decimal number of steps - cancel fitting and just use the minimum number of steps.
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if (numberOfSteps % 1 !== 0) {
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skipFitting = true;
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}
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}
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//We can fit in double the amount of scale points on the scale
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else {
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//If user has declared ints only, and the step value isn't a decimal
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if (integersOnly && rangeOrderOfMagnitude >= 0) {
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//If the user has said integers only, we need to check that making the scale more granular wouldn't make it a float
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if (stepValue / 2 % 1 === 0) {
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stepValue /= 2;
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numberOfSteps = Math.round(graphRange / stepValue);
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}
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//If it would make it a float break out of the loop
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else {
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break;
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}
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}
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//If the scale doesn't have to be an int, make the scale more granular anyway.
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else {
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stepValue /= 2;
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numberOfSteps = Math.round(graphRange / stepValue);
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}
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}
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}
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if (skipFitting) {
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numberOfSteps = minSteps;
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stepValue = graphRange / numberOfSteps;
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}
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return {
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steps: numberOfSteps,
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stepValue: stepValue,
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min: graphMin,
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max: graphMin + (numberOfSteps * stepValue)
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};
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},
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// Implementation of the nice number algorithm used in determining where axis labels will go
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niceNum = helpers.niceNum = function(range, round) {
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var exponent = Math.floor(helpers.log10(range));
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var fraction = range / Math.pow(10, exponent);
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var niceFraction;
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if (round) {
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if (fraction < 1.5) {
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niceFraction = 1;
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} else if (fraction < 3) {
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niceFraction = 2;
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} else if (fraction < 7) {
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niceFraction = 5;
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} else {
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niceFraction = 10;
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}
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} else {
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if (fraction <= 1.0) {
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niceFraction = 1;
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} else if (fraction <= 2) {
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niceFraction = 2;
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} else if (fraction <= 5) {
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niceFraction = 5;
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} else {
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niceFraction = 10;
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}
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}
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return niceFraction * Math.pow(10, exponent);
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},
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/* jshint ignore:start */
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// Blows up jshint errors based on the new Function constructor
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//Templating methods
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//Javascript micro templating by John Resig - source at http://ejohn.org/blog/javascript-micro-templating/
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template = helpers.template = function(templateString, valuesObject) {
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// If templateString is function rather than string-template - call the function for valuesObject
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if (templateString instanceof Function) {
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return templateString(valuesObject);
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}
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var cache = {};
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function tmpl(str, data) {
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// Figure out if we're getting a template, or if we need to
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// load the template - and be sure to cache the result.
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var fn = !/\W/.test(str) ?
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cache[str] = cache[str] :
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// Generate a reusable function that will serve as a template
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// generator (and which will be cached).
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new Function("obj",
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"var p=[],print=function(){p.push.apply(p,arguments);};" +
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// Introduce the data as local variables using with(){}
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"with(obj){p.push('" +
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// Convert the template into pure JavaScript
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str
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.replace(/[\r\t\n]/g, " ")
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.split("<%").join("\t")
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.replace(/((^|%>)[^\t]*)'/g, "$1\r")
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.replace(/\t=(.*?)%>/g, "',$1,'")
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.split("\t").join("');")
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.split("%>").join("p.push('")
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.split("\r").join("\\'") +
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"');}return p.join('');"
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);
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// Provide some basic currying to the user
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return data ? fn(data) : fn;
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}
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return tmpl(templateString, valuesObject);
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},
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/* jshint ignore:end */
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generateLabels = helpers.generateLabels = function(templateString, numberOfSteps, graphMin, stepValue) {
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var labelsArray = new Array(numberOfSteps);
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if (templateString) {
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each(labelsArray, function(val, index) {
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labelsArray[index] = template(templateString, {
|
|
value: (graphMin + (stepValue * (index + 1)))
|
|
});
|
|
});
|
|
}
|
|
return labelsArray;
|
|
},
|
|
//--Animation methods
|
|
//Easing functions adapted from Robert Penner's easing equations
|
|
//http://www.robertpenner.com/easing/
|
|
easingEffects = helpers.easingEffects = {
|
|
linear: function(t) {
|
|
return t;
|
|
},
|
|
easeInQuad: function(t) {
|
|
return t * t;
|
|
},
|
|
easeOutQuad: function(t) {
|
|
return -1 * t * (t - 2);
|
|
},
|
|
easeInOutQuad: function(t) {
|
|
if ((t /= 1 / 2) < 1) {
|
|
return 1 / 2 * t * t;
|
|
}
|
|
return -1 / 2 * ((--t) * (t - 2) - 1);
|
|
},
|
|
easeInCubic: function(t) {
|
|
return t * t * t;
|
|
},
|
|
easeOutCubic: function(t) {
|
|
return 1 * ((t = t / 1 - 1) * t * t + 1);
|
|
},
|
|
easeInOutCubic: function(t) {
|
|
if ((t /= 1 / 2) < 1) {
|
|
return 1 / 2 * t * t * t;
|
|
}
|
|
return 1 / 2 * ((t -= 2) * t * t + 2);
|
|
},
|
|
easeInQuart: function(t) {
|
|
return t * t * t * t;
|
|
},
|
|
easeOutQuart: function(t) {
|
|
return -1 * ((t = t / 1 - 1) * t * t * t - 1);
|
|
},
|
|
easeInOutQuart: function(t) {
|
|
if ((t /= 1 / 2) < 1) {
|
|
return 1 / 2 * t * t * t * t;
|
|
}
|
|
return -1 / 2 * ((t -= 2) * t * t * t - 2);
|
|
},
|
|
easeInQuint: function(t) {
|
|
return 1 * (t /= 1) * t * t * t * t;
|
|
},
|
|
easeOutQuint: function(t) {
|
|
return 1 * ((t = t / 1 - 1) * t * t * t * t + 1);
|
|
},
|
|
easeInOutQuint: function(t) {
|
|
if ((t /= 1 / 2) < 1) {
|
|
return 1 / 2 * t * t * t * t * t;
|
|
}
|
|
return 1 / 2 * ((t -= 2) * t * t * t * t + 2);
|
|
},
|
|
easeInSine: function(t) {
|
|
return -1 * Math.cos(t / 1 * (Math.PI / 2)) + 1;
|
|
},
|
|
easeOutSine: function(t) {
|
|
return 1 * Math.sin(t / 1 * (Math.PI / 2));
|
|
},
|
|
easeInOutSine: function(t) {
|
|
return -1 / 2 * (Math.cos(Math.PI * t / 1) - 1);
|
|
},
|
|
easeInExpo: function(t) {
|
|
return (t === 0) ? 1 : 1 * Math.pow(2, 10 * (t / 1 - 1));
|
|
},
|
|
easeOutExpo: function(t) {
|
|
return (t === 1) ? 1 : 1 * (-Math.pow(2, -10 * t / 1) + 1);
|
|
},
|
|
easeInOutExpo: function(t) {
|
|
if (t === 0) {
|
|
return 0;
|
|
}
|
|
if (t === 1) {
|
|
return 1;
|
|
}
|
|
if ((t /= 1 / 2) < 1) {
|
|
return 1 / 2 * Math.pow(2, 10 * (t - 1));
|
|
}
|
|
return 1 / 2 * (-Math.pow(2, -10 * --t) + 2);
|
|
},
|
|
easeInCirc: function(t) {
|
|
if (t >= 1) {
|
|
return t;
|
|
}
|
|
return -1 * (Math.sqrt(1 - (t /= 1) * t) - 1);
|
|
},
|
|
easeOutCirc: function(t) {
|
|
return 1 * Math.sqrt(1 - (t = t / 1 - 1) * t);
|
|
},
|
|
easeInOutCirc: function(t) {
|
|
if ((t /= 1 / 2) < 1) {
|
|
return -1 / 2 * (Math.sqrt(1 - t * t) - 1);
|
|
}
|
|
return 1 / 2 * (Math.sqrt(1 - (t -= 2) * t) + 1);
|
|
},
|
|
easeInElastic: function(t) {
|
|
var s = 1.70158;
|
|
var p = 0;
|
|
var a = 1;
|
|
if (t === 0) {
|
|
return 0;
|
|
}
|
|
if ((t /= 1) == 1) {
|
|
return 1;
|
|
}
|
|
if (!p) {
|
|
p = 1 * 0.3;
|
|
}
|
|
if (a < Math.abs(1)) {
|
|
a = 1;
|
|
s = p / 4;
|
|
} else {
|
|
s = p / (2 * Math.PI) * Math.asin(1 / a);
|
|
}
|
|
return -(a * Math.pow(2, 10 * (t -= 1)) * Math.sin((t * 1 - s) * (2 * Math.PI) / p));
|
|
},
|
|
easeOutElastic: function(t) {
|
|
var s = 1.70158;
|
|
var p = 0;
|
|
var a = 1;
|
|
if (t === 0) {
|
|
return 0;
|
|
}
|
|
if ((t /= 1) == 1) {
|
|
return 1;
|
|
}
|
|
if (!p) {
|
|
p = 1 * 0.3;
|
|
}
|
|
if (a < Math.abs(1)) {
|
|
a = 1;
|
|
s = p / 4;
|
|
} else {
|
|
s = p / (2 * Math.PI) * Math.asin(1 / a);
|
|
}
|
|
return a * Math.pow(2, -10 * t) * Math.sin((t * 1 - s) * (2 * Math.PI) / p) + 1;
|
|
},
|
|
easeInOutElastic: function(t) {
|
|
var s = 1.70158;
|
|
var p = 0;
|
|
var a = 1;
|
|
if (t === 0) {
|
|
return 0;
|
|
}
|
|
if ((t /= 1 / 2) == 2) {
|
|
return 1;
|
|
}
|
|
if (!p) {
|
|
p = 1 * (0.3 * 1.5);
|
|
}
|
|
if (a < Math.abs(1)) {
|
|
a = 1;
|
|
s = p / 4;
|
|
} else {
|
|
s = p / (2 * Math.PI) * Math.asin(1 / a);
|
|
}
|
|
if (t < 1) {
|
|
return -0.5 * (a * Math.pow(2, 10 * (t -= 1)) * Math.sin((t * 1 - s) * (2 * Math.PI) / p));
|
|
}
|
|
return a * Math.pow(2, -10 * (t -= 1)) * Math.sin((t * 1 - s) * (2 * Math.PI) / p) * 0.5 + 1;
|
|
},
|
|
easeInBack: function(t) {
|
|
var s = 1.70158;
|
|
return 1 * (t /= 1) * t * ((s + 1) * t - s);
|
|
},
|
|
easeOutBack: function(t) {
|
|
var s = 1.70158;
|
|
return 1 * ((t = t / 1 - 1) * t * ((s + 1) * t + s) + 1);
|
|
},
|
|
easeInOutBack: function(t) {
|
|
var s = 1.70158;
|
|
if ((t /= 1 / 2) < 1) {
|
|
return 1 / 2 * (t * t * (((s *= (1.525)) + 1) * t - s));
|
|
}
|
|
return 1 / 2 * ((t -= 2) * t * (((s *= (1.525)) + 1) * t + s) + 2);
|
|
},
|
|
easeInBounce: function(t) {
|
|
return 1 - easingEffects.easeOutBounce(1 - t);
|
|
},
|
|
easeOutBounce: function(t) {
|
|
if ((t /= 1) < (1 / 2.75)) {
|
|
return 1 * (7.5625 * t * t);
|
|
} else if (t < (2 / 2.75)) {
|
|
return 1 * (7.5625 * (t -= (1.5 / 2.75)) * t + 0.75);
|
|
} else if (t < (2.5 / 2.75)) {
|
|
return 1 * (7.5625 * (t -= (2.25 / 2.75)) * t + 0.9375);
|
|
} else {
|
|
return 1 * (7.5625 * (t -= (2.625 / 2.75)) * t + 0.984375);
|
|
}
|
|
},
|
|
easeInOutBounce: function(t) {
|
|
if (t < 1 / 2) {
|
|
return easingEffects.easeInBounce(t * 2) * 0.5;
|
|
}
|
|
return easingEffects.easeOutBounce(t * 2 - 1) * 0.5 + 1 * 0.5;
|
|
}
|
|
},
|
|
//Request animation polyfill - http://www.paulirish.com/2011/requestanimationframe-for-smart-animating/
|
|
requestAnimFrame = helpers.requestAnimFrame = (function() {
|
|
return window.requestAnimationFrame ||
|
|
window.webkitRequestAnimationFrame ||
|
|
window.mozRequestAnimationFrame ||
|
|
window.oRequestAnimationFrame ||
|
|
window.msRequestAnimationFrame ||
|
|
function(callback) {
|
|
return window.setTimeout(callback, 1000 / 60);
|
|
};
|
|
})(),
|
|
cancelAnimFrame = helpers.cancelAnimFrame = (function() {
|
|
return window.cancelAnimationFrame ||
|
|
window.webkitCancelAnimationFrame ||
|
|
window.mozCancelAnimationFrame ||
|
|
window.oCancelAnimationFrame ||
|
|
window.msCancelAnimationFrame ||
|
|
function(callback) {
|
|
return window.clearTimeout(callback, 1000 / 60);
|
|
};
|
|
})(),
|
|
animationLoop = helpers.animationLoop = function(callback, totalSteps, easingString, onProgress, onComplete, chartInstance) {
|
|
|
|
var currentStep = 0,
|
|
easingFunction = easingEffects[easingString] || easingEffects.linear;
|
|
|
|
var animationFrame = function() {
|
|
currentStep++;
|
|
var stepDecimal = currentStep / totalSteps;
|
|
var easeDecimal = easingFunction(stepDecimal);
|
|
|
|
callback.call(chartInstance, easeDecimal, stepDecimal, currentStep);
|
|
onProgress.call(chartInstance, easeDecimal, stepDecimal);
|
|
if (currentStep < totalSteps) {
|
|
chartInstance.animationFrame = requestAnimFrame(animationFrame);
|
|
} else {
|
|
onComplete.apply(chartInstance);
|
|
}
|
|
};
|
|
requestAnimFrame(animationFrame);
|
|
},
|
|
//-- DOM methods
|
|
getRelativePosition = helpers.getRelativePosition = function(evt) {
|
|
var mouseX, mouseY;
|
|
var e = evt.originalEvent || evt,
|
|
canvas = evt.currentTarget || evt.srcElement,
|
|
boundingRect = canvas.getBoundingClientRect();
|
|
|
|
if (e.touches) {
|
|
mouseX = e.touches[0].clientX - boundingRect.left;
|
|
mouseY = e.touches[0].clientY - boundingRect.top;
|
|
|
|
} else {
|
|
mouseX = e.clientX - boundingRect.left;
|
|
mouseY = e.clientY - boundingRect.top;
|
|
}
|
|
|
|
return {
|
|
x: mouseX,
|
|
y: mouseY
|
|
};
|
|
|
|
},
|
|
addEvent = helpers.addEvent = function(node, eventType, method) {
|
|
if (node.addEventListener) {
|
|
node.addEventListener(eventType, method);
|
|
} else if (node.attachEvent) {
|
|
node.attachEvent("on" + eventType, method);
|
|
} else {
|
|
node["on" + eventType] = method;
|
|
}
|
|
},
|
|
removeEvent = helpers.removeEvent = function(node, eventType, handler) {
|
|
if (node.removeEventListener) {
|
|
node.removeEventListener(eventType, handler, false);
|
|
} else if (node.detachEvent) {
|
|
node.detachEvent("on" + eventType, handler);
|
|
} else {
|
|
node["on" + eventType] = noop;
|
|
}
|
|
},
|
|
bindEvents = helpers.bindEvents = function(chartInstance, arrayOfEvents, handler) {
|
|
// Create the events object if it's not already present
|
|
if (!chartInstance.events) chartInstance.events = {};
|
|
|
|
each(arrayOfEvents, function(eventName) {
|
|
chartInstance.events[eventName] = function() {
|
|
handler.apply(chartInstance, arguments);
|
|
};
|
|
addEvent(chartInstance.chart.canvas, eventName, chartInstance.events[eventName]);
|
|
});
|
|
},
|
|
unbindEvents = helpers.unbindEvents = function(chartInstance, arrayOfEvents) {
|
|
each(arrayOfEvents, function(handler, eventName) {
|
|
removeEvent(chartInstance.chart.canvas, eventName, handler);
|
|
});
|
|
},
|
|
getMaximumWidth = helpers.getMaximumWidth = function(domNode) {
|
|
var container = domNode.parentNode,
|
|
padding = parseInt(getStyle(container, 'padding-left')) + parseInt(getStyle(container, 'padding-right'));
|
|
// TODO = check cross browser stuff with this.
|
|
return container.clientWidth - padding;
|
|
},
|
|
getMaximumHeight = helpers.getMaximumHeight = function(domNode) {
|
|
var container = domNode.parentNode,
|
|
padding = parseInt(getStyle(container, 'padding-bottom')) + parseInt(getStyle(container, 'padding-top'));
|
|
// TODO = check cross browser stuff with this.
|
|
return container.clientHeight - padding;
|
|
},
|
|
getStyle = helpers.getStyle = function(el, property) {
|
|
return el.currentStyle ?
|
|
el.currentStyle[property] :
|
|
document.defaultView.getComputedStyle(el, null).getPropertyValue(property);
|
|
},
|
|
getMaximumSize = helpers.getMaximumSize = helpers.getMaximumWidth, // legacy support
|
|
retinaScale = helpers.retinaScale = function(chart) {
|
|
var ctx = chart.ctx,
|
|
width = chart.canvas.width,
|
|
height = chart.canvas.height;
|
|
|
|
if (window.devicePixelRatio) {
|
|
ctx.canvas.style.width = width + "px";
|
|
ctx.canvas.style.height = height + "px";
|
|
ctx.canvas.height = height * window.devicePixelRatio;
|
|
ctx.canvas.width = width * window.devicePixelRatio;
|
|
ctx.scale(window.devicePixelRatio, window.devicePixelRatio);
|
|
}
|
|
},
|
|
//-- Canvas methods
|
|
clear = helpers.clear = function(chart) {
|
|
chart.ctx.clearRect(0, 0, chart.width, chart.height);
|
|
},
|
|
fontString = helpers.fontString = function(pixelSize, fontStyle, fontFamily) {
|
|
return fontStyle + " " + pixelSize + "px " + fontFamily;
|
|
},
|
|
longestText = helpers.longestText = function(ctx, font, arrayOfStrings) {
|
|
ctx.font = font;
|
|
var longest = 0;
|
|
each(arrayOfStrings, function(string) {
|
|
var textWidth = ctx.measureText(string).width;
|
|
longest = (textWidth > longest) ? textWidth : longest;
|
|
});
|
|
return longest;
|
|
},
|
|
drawRoundedRectangle = helpers.drawRoundedRectangle = function(ctx, x, y, width, height, radius) {
|
|
ctx.beginPath();
|
|
ctx.moveTo(x + radius, y);
|
|
ctx.lineTo(x + width - radius, y);
|
|
ctx.quadraticCurveTo(x + width, y, x + width, y + radius);
|
|
ctx.lineTo(x + width, y + height - radius);
|
|
ctx.quadraticCurveTo(x + width, y + height, x + width - radius, y + height);
|
|
ctx.lineTo(x + radius, y + height);
|
|
ctx.quadraticCurveTo(x, y + height, x, y + height - radius);
|
|
ctx.lineTo(x, y + radius);
|
|
ctx.quadraticCurveTo(x, y, x + radius, y);
|
|
ctx.closePath();
|
|
},
|
|
color = helpers.color = function(color) {
|
|
if (!window.Color) {
|
|
console.log('Color.js not found!');
|
|
return color;
|
|
}
|
|
return window.Color(color);
|
|
},
|
|
isArray = helpers.isArray = function(obj) {
|
|
if (!Array.isArray) {
|
|
return Object.prototype.toString.call(arg) === '[object Array]';
|
|
}
|
|
return Array.isArray(obj);
|
|
};
|
|
|
|
//Store a reference to each instance - allowing us to globally resize chart instances on window resize.
|
|
//Destroy method on the chart will remove the instance of the chart from this reference.
|
|
Chart.instances = {};
|
|
|
|
Chart.Type = function(config, instance) {
|
|
this.data = config.data;
|
|
this.options = config.options;
|
|
this.chart = instance;
|
|
this.id = uid();
|
|
//Add the chart instance to the global namespace
|
|
Chart.instances[this.id] = this;
|
|
|
|
// Initialize is always called when a chart type is created
|
|
// By default it is a no op, but it should be extended
|
|
if (this.options.responsive) {
|
|
this.resize();
|
|
}
|
|
this.initialize.call(this);
|
|
};
|
|
|
|
//Core methods that'll be a part of every chart type
|
|
extend(Chart.Type.prototype, {
|
|
initialize: function() {
|
|
return this;
|
|
},
|
|
clear: function() {
|
|
clear(this.chart);
|
|
return this;
|
|
},
|
|
stop: function() {
|
|
// Stops any current animation loop occuring
|
|
Chart.animationService.cancelAnimation(this);
|
|
return this;
|
|
},
|
|
resize: function() {
|
|
this.stop();
|
|
var canvas = this.chart.canvas,
|
|
newWidth = getMaximumWidth(this.chart.canvas),
|
|
newHeight = this.options.maintainAspectRatio ? newWidth / this.chart.aspectRatio : getMaximumHeight(this.chart.canvas);
|
|
|
|
canvas.width = this.chart.width = newWidth;
|
|
canvas.height = this.chart.height = newHeight;
|
|
|
|
retinaScale(this.chart);
|
|
|
|
return this;
|
|
},
|
|
redraw: noop,
|
|
render: function(duration) {
|
|
|
|
if (this.options.animation.duration !== 0 || duration) {
|
|
var animation = new Chart.Animation();
|
|
animation.numSteps = (duration || this.options.animation.duration) / 16.66; //60 fps
|
|
animation.easing = this.options.animation.easing;
|
|
|
|
// render function
|
|
animation.render = function(chartInstance, animationObject) {
|
|
var easingFunction = helpers.easingEffects[animationObject.easing];
|
|
var stepDecimal = animationObject.currentStep / animationObject.numSteps;
|
|
var easeDecimal = easingFunction(stepDecimal);
|
|
|
|
chartInstance.draw(easeDecimal, stepDecimal, animationObject.currentStep);
|
|
};
|
|
|
|
// user events
|
|
animation.onAnimationProgress = this.options.onAnimationProgress;
|
|
animation.onAnimationComplete = this.options.onAnimationComplete;
|
|
|
|
Chart.animationService.addAnimation(this, animation, duration);
|
|
} else {
|
|
this.draw();
|
|
this.options.onAnimationComplete.call(this);
|
|
}
|
|
return this;
|
|
},
|
|
eachElement: function(callback) {
|
|
helpers.each(this.data.datasets, function(dataset, datasetIndex) {
|
|
helpers.each(dataset.metaData, callback, this, dataset.metaData, datasetIndex);
|
|
}, this);
|
|
},
|
|
eachValue: function(callback) {
|
|
helpers.each(this.data.datasets, function(dataset, datasetIndex) {
|
|
helpers.each(dataset.data, callback, this, datasetIndex);
|
|
}, this);
|
|
},
|
|
eachDataset: function(callback) {
|
|
helpers.each(this.data.datasets, callback, this);
|
|
},
|
|
getElementsAtEvent: function(e) {
|
|
var elementsArray = [],
|
|
eventPosition = helpers.getRelativePosition(e),
|
|
datasetIterator = function(dataset) {
|
|
elementsArray.push(dataset.metaData[elementIndex]);
|
|
},
|
|
elementIndex;
|
|
|
|
for (var datasetIndex = 0; datasetIndex < this.data.datasets.length; datasetIndex++) {
|
|
for (elementIndex = 0; elementIndex < this.data.datasets[datasetIndex].metaData.length; elementIndex++) {
|
|
if (this.data.datasets[datasetIndex].metaData[elementIndex].inGroupRange(eventPosition.x, eventPosition.y)) {
|
|
helpers.each(this.data.datasets, datasetIterator);
|
|
}
|
|
}
|
|
}
|
|
|
|
return elementsArray.length ? elementsArray : [];
|
|
},
|
|
// Get the single element that was clicked on
|
|
// @return : An object containing the dataset index and element index of the matching element. Also contains the rectangle that was drawn
|
|
getElementAtEvent: function(e) {
|
|
var element = [];
|
|
var eventPosition = helpers.getRelativePosition(e);
|
|
|
|
for (var datasetIndex = 0; datasetIndex < this.data.datasets.length; ++datasetIndex) {
|
|
for (var elementIndex = 0; elementIndex < this.data.datasets[datasetIndex].metaData.length; ++elementIndex) {
|
|
if (this.data.datasets[datasetIndex].metaData[elementIndex].inRange(eventPosition.x, eventPosition.y)) {
|
|
element.push(this.data.datasets[datasetIndex].metaData[elementIndex]);
|
|
return element;
|
|
}
|
|
}
|
|
}
|
|
|
|
return [];
|
|
},
|
|
generateLegend: function() {
|
|
return template(this.options.legendTemplate, this);
|
|
},
|
|
destroy: function() {
|
|
this.clear();
|
|
unbindEvents(this, this.events);
|
|
var canvas = this.chart.canvas;
|
|
|
|
// Reset canvas height/width attributes starts a fresh with the canvas context
|
|
canvas.width = this.chart.width;
|
|
canvas.height = this.chart.height;
|
|
|
|
// < IE9 doesn't support removeProperty
|
|
if (canvas.style.removeProperty) {
|
|
canvas.style.removeProperty('width');
|
|
canvas.style.removeProperty('height');
|
|
} else {
|
|
canvas.style.removeAttribute('width');
|
|
canvas.style.removeAttribute('height');
|
|
}
|
|
|
|
delete Chart.instances[this.id];
|
|
},
|
|
toBase64Image: function() {
|
|
return this.chart.canvas.toDataURL.apply(this.chart.canvas, arguments);
|
|
}
|
|
});
|
|
|
|
Chart.Type.extend = function(extensions) {
|
|
|
|
var parent = this;
|
|
|
|
var ChartType = function() {
|
|
return parent.apply(this, arguments);
|
|
};
|
|
|
|
//Copy the prototype object of the this class
|
|
ChartType.prototype = clone(parent.prototype);
|
|
//Now overwrite some of the properties in the base class with the new extensions
|
|
extend(ChartType.prototype, extensions);
|
|
|
|
ChartType.extend = Chart.Type.extend;
|
|
|
|
if (extensions.name || parent.prototype.name) {
|
|
|
|
var chartName = extensions.name || parent.prototype.name;
|
|
//Assign any potential default values of the new chart type
|
|
|
|
//If none are defined, we'll use a clone of the chart type this is being extended from.
|
|
//I.e. if we extend a line chart, we'll use the defaults from the line chart if our new chart
|
|
//doesn't define some defaults of their own.
|
|
|
|
var baseDefaults = (Chart.defaults[parent.prototype.name]) ? clone(Chart.defaults[parent.prototype.name]) : {};
|
|
|
|
Chart.defaults[chartName] = helpers.configMerge(baseDefaults, extensions.defaults);
|
|
|
|
Chart.types[chartName] = ChartType;
|
|
|
|
//Register this new chart type in the Chart prototype
|
|
Chart.prototype[chartName] = function(config) {
|
|
config.options = helpers.configMerge(Chart.defaults.global, Chart.defaults[chartName], config.options || {});
|
|
return new ChartType(config, this);
|
|
};
|
|
} else {
|
|
warn("Name not provided for this chart, so it hasn't been registered");
|
|
}
|
|
return parent;
|
|
};
|
|
|
|
Chart.Element = function(configuration) {
|
|
extend(this, configuration);
|
|
this.initialize.apply(this, arguments);
|
|
};
|
|
extend(Chart.Element.prototype, {
|
|
initialize: function() {},
|
|
pivot: function() {
|
|
if (!this._view) {
|
|
this._view = clone(this._model);
|
|
}
|
|
this._start = clone(this._view);
|
|
return this;
|
|
},
|
|
transition: function(ease) {
|
|
if (!this._view) {
|
|
this._view = clone(this._model);
|
|
}
|
|
if (!this._start) {
|
|
this.pivot();
|
|
}
|
|
|
|
each(this._model, function(value, key) {
|
|
|
|
if (key[0] === '_' || !this._model.hasOwnProperty(key)) {
|
|
// Only non-underscored properties
|
|
}
|
|
|
|
// Init if doesn't exist
|
|
else if (!this._view[key]) {
|
|
if (typeof value === 'number') {
|
|
this._view[key] = value * ease;
|
|
} else {
|
|
this._view[key] = value || null;
|
|
}
|
|
}
|
|
|
|
// No unnecessary computations
|
|
else if (this._model[key] === this._view[key]) {
|
|
// It's the same! Woohoo!
|
|
}
|
|
|
|
// Color transitions if possible
|
|
else if (typeof value === 'string') {
|
|
try {
|
|
var color = helpers.color(this._start[key]).mix(helpers.color(this._model[key]), ease);
|
|
this._view[key] = color.rgbString();
|
|
} catch (err) {
|
|
this._view[key] = value;
|
|
}
|
|
}
|
|
// Number transitions
|
|
else if (typeof value === 'number') {
|
|
var startVal = this._start[key] !== undefined ? this._start[key] : 0;
|
|
this._view[key] = ((this._model[key] - startVal) * ease) + startVal;
|
|
}
|
|
// Everything else
|
|
else {
|
|
this._view[key] = value;
|
|
}
|
|
|
|
}, this);
|
|
|
|
if (ease === 1) {
|
|
delete this._start;
|
|
}
|
|
return this;
|
|
},
|
|
tooltipPosition: function() {
|
|
return {
|
|
x: this._model.x,
|
|
y: this._model.y
|
|
};
|
|
},
|
|
hasValue: function() {
|
|
return isNumber(this._model.x) && isNumber(this._model.y);
|
|
}
|
|
});
|
|
|
|
Chart.Element.extend = inherits;
|
|
|
|
|
|
// Attach global event to resize each chart instance when the browser resizes
|
|
helpers.addEvent(window, "resize", (function() {
|
|
// Basic debounce of resize function so it doesn't hurt performance when resizing browser.
|
|
var timeout;
|
|
return function() {
|
|
clearTimeout(timeout);
|
|
timeout = setTimeout(function() {
|
|
each(Chart.instances, function(instance) {
|
|
// If the responsive flag is set in the chart instance config
|
|
// Cascade the resize event down to the chart.
|
|
if (instance.options.responsive) {
|
|
instance.resize();
|
|
instance.update();
|
|
instance.render();
|
|
}
|
|
});
|
|
}, 50);
|
|
};
|
|
})());
|
|
|
|
|
|
if (amd) {
|
|
define(function() {
|
|
return Chart;
|
|
});
|
|
} else if (typeof module === 'object' && module.exports) {
|
|
module.exports = Chart;
|
|
}
|
|
|
|
root.Chart = Chart;
|
|
|
|
Chart.noConflict = function() {
|
|
root.Chart = previous;
|
|
return Chart;
|
|
};
|
|
|
|
}).call(this);
|