--- /dev/null
+/*!
+ * Chart.js
+ * http://chartjs.org/
+ * Version: {{ version }}
+ *
+ * Copyright 2015 Nick Downie
+ * Released under the MIT license
+ * https://github.com/nnnick/Chart.js/blob/master/LICENSE.md
+ */
+
+
+(function(){
+
+ "use strict";
+
+ //Declare root variable - window in the browser, global on the server
+ var root = this,
+ previous = root.Chart;
+
+ //Occupy the global variable of Chart, and create a simple base class
+ var Chart = function(context){
+ var chart = this;
+ this.canvas = context.canvas;
+
+ this.ctx = context;
+
+ //Variables global to the chart
+ var computeDimension = function(element,dimension)
+ {
+ if (element['offset'+dimension])
+ {
+ return element['offset'+dimension];
+ }
+ else
+ {
+ return document.defaultView.getComputedStyle(element).getPropertyValue(dimension);
+ }
+ };
+
+ var width = this.width = computeDimension(context.canvas,'Width') || context.canvas.width;
+ var height = this.height = computeDimension(context.canvas,'Height') || context.canvas.height;
+
+ // Firefox requires this to work correctly
+ context.canvas.width = width;
+ context.canvas.height = height;
+
+ width = this.width = context.canvas.width;
+ height = this.height = context.canvas.height;
+ this.aspectRatio = this.width / this.height;
+ //High pixel density displays - multiply the size of the canvas height/width by the device pixel ratio, then scale.
+ helpers.retinaScale(this);
+
+ return this;
+ };
+ //Globally expose the defaults to allow for user updating/changing
+ Chart.defaults = {
+ global: {
+ // Boolean - Whether to animate the chart
+ animation: true,
+
+ // Number - Number of animation steps
+ animationSteps: 60,
+
+ // String - Animation easing effect
+ animationEasing: "easeOutQuart",
+
+ // Boolean - If we should show the scale at all
+ showScale: true,
+
+ // Boolean - If we want to override with a hard coded scale
+ scaleOverride: false,
+
+ // ** Required if scaleOverride is true **
+ // Number - The number of steps in a hard coded scale
+ scaleSteps: null,
+ // Number - The value jump in the hard coded scale
+ scaleStepWidth: null,
+ // Number - The scale starting value
+ scaleStartValue: null,
+
+ // String - Colour of the scale line
+ scaleLineColor: "rgba(0,0,0,.1)",
+
+ // Number - Pixel width of the scale line
+ scaleLineWidth: 1,
+
+ // Boolean - Whether to show labels on the scale
+ scaleShowLabels: true,
+
+ // Interpolated JS string - can access value
+ scaleLabel: "<%=value%>",
+
+ // Boolean - Whether the scale should stick to integers, and not show any floats even if drawing space is there
+ scaleIntegersOnly: true,
+
+ // Boolean - Whether the scale should start at zero, or an order of magnitude down from the lowest value
+ scaleBeginAtZero: false,
+
+ // String - Scale label font declaration for the scale label
+ scaleFontFamily: "'Helvetica Neue', 'Helvetica', 'Arial', sans-serif",
+
+ // Number - Scale label font size in pixels
+ scaleFontSize: 12,
+
+ // String - Scale label font weight style
+ scaleFontStyle: "normal",
+
+ // String - Scale label font colour
+ scaleFontColor: "#666",
+
+ // Boolean - whether or not the chart should be responsive and resize when the browser does.
+ responsive: false,
+
+ // Boolean - whether to maintain the starting aspect ratio or not when responsive, if set to false, will take up entire container
+ maintainAspectRatio: true,
+
+ // Boolean - Determines whether to draw tooltips on the canvas or not - attaches events to touchmove & mousemove
+ showTooltips: true,
+
+ // Boolean - Determines whether to draw built-in tooltip or call custom tooltip function
+ customTooltips: false,
+
+ // Array - Array of string names to attach tooltip events
+ tooltipEvents: ["mousemove", "touchstart", "touchmove", "mouseout"],
+
+ // String - Tooltip background colour
+ tooltipFillColor: "rgba(0,0,0,0.8)",
+
+ // String - Tooltip label font declaration for the scale label
+ tooltipFontFamily: "'Helvetica Neue', 'Helvetica', 'Arial', sans-serif",
+
+ // Number - Tooltip label font size in pixels
+ tooltipFontSize: 14,
+
+ // String - Tooltip font weight style
+ tooltipFontStyle: "normal",
+
+ // String - Tooltip label font colour
+ tooltipFontColor: "#fff",
+
+ // String - Tooltip title font declaration for the scale label
+ tooltipTitleFontFamily: "'Helvetica Neue', 'Helvetica', 'Arial', sans-serif",
+
+ // Number - Tooltip title font size in pixels
+ tooltipTitleFontSize: 14,
+
+ // String - Tooltip title font weight style
+ tooltipTitleFontStyle: "bold",
+
+ // String - Tooltip title font colour
+ tooltipTitleFontColor: "#fff",
+
+ // Number - pixel width of padding around tooltip text
+ tooltipYPadding: 6,
+
+ // Number - pixel width of padding around tooltip text
+ tooltipXPadding: 6,
+
+ // Number - Size of the caret on the tooltip
+ tooltipCaretSize: 8,
+
+ // Number - Pixel radius of the tooltip border
+ tooltipCornerRadius: 6,
+
+ // Number - Pixel offset from point x to tooltip edge
+ tooltipXOffset: 10,
+
+ // String - Template string for single tooltips
+ tooltipTemplate: "<%if (label){%><%=label%>: <%}%><%= value %>",
+
+ // String - Template string for single tooltips
+ multiTooltipTemplate: "<%= value %>",
+
+ // String - Colour behind the legend colour block
+ multiTooltipKeyBackground: '#fff',
+
+ // Function - Will fire on animation progression.
+ onAnimationProgress: function(){},
+
+ // Function - Will fire on animation completion.
+ onAnimationComplete: function(){}
+
+ }
+ };
+
+ //Create a dictionary of chart types, to allow for extension of existing types
+ Chart.types = {};
+
+ //Global Chart helpers object for utility methods and classes
+ var helpers = Chart.helpers = {};
+
+ //-- Basic js utility methods
+ var each = helpers.each = function(loopable,callback,self){
+ var additionalArgs = Array.prototype.slice.call(arguments, 3);
+ // Check to see if null or undefined firstly.
+ if (loopable){
+ if (loopable.length === +loopable.length){
+ var i;
+ for (i=0; i<loopable.length; i++){
+ callback.apply(self,[loopable[i], i].concat(additionalArgs));
+ }
+ }
+ else{
+ for (var item in loopable){
+ callback.apply(self,[loopable[item],item].concat(additionalArgs));
+ }
+ }
+ }
+ },
+ clone = helpers.clone = function(obj){
+ var objClone = {};
+ each(obj,function(value,key){
+ if (obj.hasOwnProperty(key)){
+ objClone[key] = value;
+ }
+ });
+ return objClone;
+ },
+ extend = helpers.extend = function(base){
+ each(Array.prototype.slice.call(arguments,1), function(extensionObject) {
+ each(extensionObject,function(value,key){
+ if (extensionObject.hasOwnProperty(key)){
+ base[key] = value;
+ }
+ });
+ });
+ return base;
+ },
+ merge = helpers.merge = function(base,master){
+ //Merge properties in left object over to a shallow clone of object right.
+ var args = Array.prototype.slice.call(arguments,0);
+ args.unshift({});
+ return extend.apply(null, args);
+ },
+ indexOf = helpers.indexOf = function(arrayToSearch, item){
+ if (Array.prototype.indexOf) {
+ return arrayToSearch.indexOf(item);
+ }
+ else{
+ for (var i = 0; i < arrayToSearch.length; i++) {
+ if (arrayToSearch[i] === item) return i;
+ }
+ return -1;
+ }
+ },
+ where = helpers.where = function(collection, filterCallback){
+ var filtered = [];
+
+ helpers.each(collection, function(item){
+ if (filterCallback(item)){
+ filtered.push(item);
+ }
+ });
+
+ return filtered;
+ },
+ findNextWhere = helpers.findNextWhere = function(arrayToSearch, filterCallback, startIndex){
+ // Default to start of the array
+ if (!startIndex){
+ startIndex = -1;
+ }
+ for (var i = startIndex + 1; i < arrayToSearch.length; i++) {
+ var currentItem = arrayToSearch[i];
+ if (filterCallback(currentItem)){
+ return currentItem;
+ }
+ }
+ },
+ findPreviousWhere = helpers.findPreviousWhere = function(arrayToSearch, filterCallback, startIndex){
+ // Default to end of the array
+ if (!startIndex){
+ startIndex = arrayToSearch.length;
+ }
+ for (var i = startIndex - 1; i >= 0; i--) {
+ var currentItem = arrayToSearch[i];
+ if (filterCallback(currentItem)){
+ return currentItem;
+ }
+ }
+ },
+ inherits = helpers.inherits = function(extensions){
+ //Basic javascript inheritance based on the model created in Backbone.js
+ var parent = this;
+ var ChartElement = (extensions && extensions.hasOwnProperty("constructor")) ? extensions.constructor : function(){ return parent.apply(this, arguments); };
+
+ var Surrogate = function(){ this.constructor = ChartElement;};
+ Surrogate.prototype = parent.prototype;
+ ChartElement.prototype = new Surrogate();
+
+ ChartElement.extend = inherits;
+
+ if (extensions) extend(ChartElement.prototype, extensions);
+
+ ChartElement.__super__ = parent.prototype;
+
+ return ChartElement;
+ },
+ noop = helpers.noop = function(){},
+ uid = helpers.uid = (function(){
+ var id=0;
+ return function(){
+ return "chart-" + id++;
+ };
+ })(),
+ warn = helpers.warn = function(str){
+ //Method for warning of errors
+ if (window.console && typeof window.console.warn === "function") console.warn(str);
+ },
+ amd = helpers.amd = (typeof define === 'function' && define.amd),
+ //-- Math methods
+ isNumber = helpers.isNumber = function(n){
+ return !isNaN(parseFloat(n)) && isFinite(n);
+ },
+ max = helpers.max = function(array){
+ return Math.max.apply( Math, array );
+ },
+ min = helpers.min = function(array){
+ return Math.min.apply( Math, array );
+ },
+ cap = helpers.cap = function(valueToCap,maxValue,minValue){
+ if(isNumber(maxValue)) {
+ if( valueToCap > maxValue ) {
+ return maxValue;
+ }
+ }
+ else if(isNumber(minValue)){
+ if ( valueToCap < minValue ){
+ return minValue;
+ }
+ }
+ return valueToCap;
+ },
+ getDecimalPlaces = helpers.getDecimalPlaces = function(num){
+ if (num%1!==0 && isNumber(num)){
+ var s = num.toString();
+ if(s.indexOf("e-") < 0){
+ // no exponent, e.g. 0.01
+ return s.split(".")[1].length;
+ }
+ else if(s.indexOf(".") < 0) {
+ // no decimal point, e.g. 1e-9
+ return parseInt(s.split("e-")[1]);
+ }
+ else {
+ // exponent and decimal point, e.g. 1.23e-9
+ var parts = s.split(".")[1].split("e-");
+ return parts[0].length + parseInt(parts[1]);
+ }
+ }
+ else {
+ return 0;
+ }
+ },
+ toRadians = helpers.radians = function(degrees){
+ return degrees * (Math.PI/180);
+ },
+ // Gets the angle from vertical upright to the point about a centre.
+ getAngleFromPoint = helpers.getAngleFromPoint = function(centrePoint, anglePoint){
+ var distanceFromXCenter = anglePoint.x - centrePoint.x,
+ distanceFromYCenter = anglePoint.y - centrePoint.y,
+ radialDistanceFromCenter = Math.sqrt( distanceFromXCenter * distanceFromXCenter + distanceFromYCenter * distanceFromYCenter);
+
+
+ var angle = Math.PI * 2 + Math.atan2(distanceFromYCenter, distanceFromXCenter);
+
+ //If the segment is in the top left quadrant, we need to add another rotation to the angle
+ if (distanceFromXCenter < 0 && distanceFromYCenter < 0){
+ angle += Math.PI*2;
+ }
+
+ return {
+ angle: angle,
+ distance: radialDistanceFromCenter
+ };
+ },
+ aliasPixel = helpers.aliasPixel = function(pixelWidth){
+ return (pixelWidth % 2 === 0) ? 0 : 0.5;
+ },
+ splineCurve = helpers.splineCurve = function(FirstPoint,MiddlePoint,AfterPoint,t){
+ //Props to Rob Spencer at scaled innovation for his post on splining between points
+ //http://scaledinnovation.com/analytics/splines/aboutSplines.html
+ var d01=Math.sqrt(Math.pow(MiddlePoint.x-FirstPoint.x,2)+Math.pow(MiddlePoint.y-FirstPoint.y,2)),
+ d12=Math.sqrt(Math.pow(AfterPoint.x-MiddlePoint.x,2)+Math.pow(AfterPoint.y-MiddlePoint.y,2)),
+ fa=t*d01/(d01+d12),// scaling factor for triangle Ta
+ fb=t*d12/(d01+d12);
+ return {
+ inner : {
+ x : MiddlePoint.x-fa*(AfterPoint.x-FirstPoint.x),
+ y : MiddlePoint.y-fa*(AfterPoint.y-FirstPoint.y)
+ },
+ outer : {
+ x: MiddlePoint.x+fb*(AfterPoint.x-FirstPoint.x),
+ y : MiddlePoint.y+fb*(AfterPoint.y-FirstPoint.y)
+ }
+ };
+ },
+ calculateOrderOfMagnitude = helpers.calculateOrderOfMagnitude = function(val){
+ return Math.floor(Math.log(val) / Math.LN10);
+ },
+ calculateScaleRange = helpers.calculateScaleRange = function(valuesArray, drawingSize, textSize, startFromZero, integersOnly){
+
+ //Set a minimum step of two - a point at the top of the graph, and a point at the base
+ var minSteps = 2,
+ maxSteps = Math.floor(drawingSize/(textSize * 1.5)),
+ skipFitting = (minSteps >= maxSteps);
+
+ var maxValue = max(valuesArray),
+ minValue = min(valuesArray);
+
+ // We need some degree of separation here to calculate the scales if all the values are the same
+ // Adding/minusing 0.5 will give us a range of 1.
+ if (maxValue === minValue){
+ maxValue += 0.5;
+ // So we don't end up with a graph with a negative start value if we've said always start from zero
+ if (minValue >= 0.5 && !startFromZero){
+ minValue -= 0.5;
+ }
+ else{
+ // Make up a whole number above the values
+ maxValue += 0.5;
+ }
+ }
+
+ var valueRange = Math.abs(maxValue - minValue),
+ rangeOrderOfMagnitude = calculateOrderOfMagnitude(valueRange),
+ graphMax = Math.ceil(maxValue / (1 * Math.pow(10, rangeOrderOfMagnitude))) * Math.pow(10, rangeOrderOfMagnitude),
+ graphMin = (startFromZero) ? 0 : Math.floor(minValue / (1 * Math.pow(10, rangeOrderOfMagnitude))) * Math.pow(10, rangeOrderOfMagnitude),
+ graphRange = graphMax - graphMin,
+ stepValue = Math.pow(10, rangeOrderOfMagnitude),
+ numberOfSteps = Math.round(graphRange / stepValue);
+
+ //If we have more space on the graph we'll use it to give more definition to the data
+ while((numberOfSteps > maxSteps || (numberOfSteps * 2) < maxSteps) && !skipFitting) {
+ if(numberOfSteps > maxSteps){
+ stepValue *=2;
+ numberOfSteps = Math.round(graphRange/stepValue);
+ // Don't ever deal with a decimal number of steps - cancel fitting and just use the minimum number of steps.
+ if (numberOfSteps % 1 !== 0){
+ skipFitting = true;
+ }
+ }
+ //We can fit in double the amount of scale points on the scale
+ else{
+ //If user has declared ints only, and the step value isn't a decimal
+ if (integersOnly && rangeOrderOfMagnitude >= 0){
+ //If the user has said integers only, we need to check that making the scale more granular wouldn't make it a float
+ if(stepValue/2 % 1 === 0){
+ stepValue /=2;
+ numberOfSteps = Math.round(graphRange/stepValue);
+ }
+ //If it would make it a float break out of the loop
+ else{
+ break;
+ }
+ }
+ //If the scale doesn't have to be an int, make the scale more granular anyway.
+ else{
+ stepValue /=2;
+ numberOfSteps = Math.round(graphRange/stepValue);
+ }
+
+ }
+ }
+
+ if (skipFitting){
+ numberOfSteps = minSteps;
+ stepValue = graphRange / numberOfSteps;
+ }
+
+ return {
+ steps : numberOfSteps,
+ stepValue : stepValue,
+ min : graphMin,
+ max : graphMin + (numberOfSteps * stepValue)
+ };
+
+ },
+ /* jshint ignore:start */
+ // Blows up jshint errors based on the new Function constructor
+ //Templating methods
+ //Javascript micro templating by John Resig - source at http://ejohn.org/blog/javascript-micro-templating/
+ template = helpers.template = function(templateString, valuesObject){
+
+ // If templateString is function rather than string-template - call the function for valuesObject
+
+ if(templateString instanceof Function){
+ return templateString(valuesObject);
+ }
+
+ var cache = {};
+ function tmpl(str, data){
+ // Figure out if we're getting a template, or if we need to
+ // load the template - and be sure to cache the result.
+ var fn = !/\W/.test(str) ?
+ cache[str] = cache[str] :
+
+ // Generate a reusable function that will serve as a template
+ // generator (and which will be cached).
+ new Function("obj",
+ "var p=[],print=function(){p.push.apply(p,arguments);};" +
+
+ // Introduce the data as local variables using with(){}
+ "with(obj){p.push('" +
+
+ // Convert the template into pure JavaScript
+ str
+ .replace(/[\r\t\n]/g, " ")
+ .split("<%").join("\t")
+ .replace(/((^|%>)[^\t]*)'/g, "$1\r")
+ .replace(/\t=(.*?)%>/g, "',$1,'")
+ .split("\t").join("');")
+ .split("%>").join("p.push('")
+ .split("\r").join("\\'") +
+ "');}return p.join('');"
+ );
+
+ // Provide some basic currying to the user
+ return data ? fn( data ) : fn;
+ }
+ return tmpl(templateString,valuesObject);
+ },
+ /* jshint ignore:end */
+ generateLabels = helpers.generateLabels = function(templateString,numberOfSteps,graphMin,stepValue){
+ var labelsArray = new Array(numberOfSteps);
+ if (templateString){
+ each(labelsArray,function(val,index){
+ 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();
+ };
+
+
+ //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(data,options,chart){
+ this.options = options;
+ this.chart = chart;
+ 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 (options.responsive){
+ this.resize();
+ }
+ this.initialize.call(this,data);
+ };
+
+ //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(callback){
+ 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);
+
+ if (typeof callback === "function"){
+ callback.apply(this, Array.prototype.slice.call(arguments, 1));
+ }
+ return this;
+ },
+ reflow : noop,
+ render : function(reflow){
+ if (reflow){
+ this.reflow();
+ }
+
+ if (this.options.animation && !reflow){
+ var animation = new Chart.Animation();
+ animation.numSteps = this.options.animationSteps;
+ animation.easing = this.options.animationEasing;
+
+ // 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);
+ }
+ else{
+ this.draw();
+ this.options.onAnimationComplete.call(this);
+ }
+ return this;
+ },
+ 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];
+ },
+ showTooltip : function(ChartElements, forceRedraw){
+ // Only redraw the chart if we've actually changed what we're hovering on.
+ if (typeof this.activeElements === 'undefined') this.activeElements = [];
+
+ var isChanged = (function(Elements){
+ var changed = false;
+
+ if (Elements.length !== this.activeElements.length){
+ changed = true;
+ return changed;
+ }
+
+ each(Elements, function(element, index){
+ if (element !== this.activeElements[index]){
+ changed = true;
+ }
+ }, this);
+ return changed;
+ }).call(this, ChartElements);
+
+ if (!isChanged && !forceRedraw){
+ return;
+ }
+ else{
+ this.activeElements = ChartElements;
+ }
+ this.draw();
+ if(this.options.customTooltips){
+ this.options.customTooltips(false);
+ }
+ if (ChartElements.length > 0){
+ // If we have multiple datasets, show a MultiTooltip for all of the data points at that index
+ if (this.datasets && this.datasets.length > 1) {
+ var dataArray,
+ dataIndex;
+
+ for (var i = this.datasets.length - 1; i >= 0; i--) {
+ dataArray = this.datasets[i].points || this.datasets[i].bars || this.datasets[i].segments;
+ dataIndex = indexOf(dataArray, ChartElements[0]);
+ if (dataIndex !== -1){
+ break;
+ }
+ }
+ var tooltipLabels = [],
+ tooltipColors = [],
+ medianPosition = (function(index) {
+
+ // Get all the points at that particular index
+ var Elements = [],
+ dataCollection,
+ xPositions = [],
+ yPositions = [],
+ xMax,
+ yMax,
+ xMin,
+ yMin;
+ helpers.each(this.datasets, function(dataset){
+ dataCollection = dataset.points || dataset.bars || dataset.segments;
+ if (dataCollection[dataIndex] && dataCollection[dataIndex].hasValue()){
+ Elements.push(dataCollection[dataIndex]);
+ }
+ });
+
+ helpers.each(Elements, function(element) {
+ xPositions.push(element.x);
+ yPositions.push(element.y);
+
+
+ //Include any colour information about the element
+ tooltipLabels.push(helpers.template(this.options.multiTooltipTemplate, element));
+ tooltipColors.push({
+ fill: element._saved.fillColor || element.fillColor,
+ stroke: element._saved.strokeColor || element.strokeColor
+ });
+
+ }, this);
+
+ yMin = min(yPositions);
+ yMax = max(yPositions);
+
+ xMin = min(xPositions);
+ xMax = max(xPositions);
+
+ return {
+ x: (xMin > this.chart.width/2) ? xMin : xMax,
+ y: (yMin + yMax)/2
+ };
+ }).call(this, dataIndex);
+
+ new Chart.MultiTooltip({
+ x: medianPosition.x,
+ y: medianPosition.y,
+ xPadding: this.options.tooltipXPadding,
+ yPadding: this.options.tooltipYPadding,
+ xOffset: this.options.tooltipXOffset,
+ fillColor: this.options.tooltipFillColor,
+ textColor: this.options.tooltipFontColor,
+ fontFamily: this.options.tooltipFontFamily,
+ fontStyle: this.options.tooltipFontStyle,
+ fontSize: this.options.tooltipFontSize,
+ titleTextColor: this.options.tooltipTitleFontColor,
+ titleFontFamily: this.options.tooltipTitleFontFamily,
+ titleFontStyle: this.options.tooltipTitleFontStyle,
+ titleFontSize: this.options.tooltipTitleFontSize,
+ cornerRadius: this.options.tooltipCornerRadius,
+ labels: tooltipLabels,
+ legendColors: tooltipColors,
+ legendColorBackground : this.options.multiTooltipKeyBackground,
+ title: ChartElements[0].label,
+ chart: this.chart,
+ ctx: this.chart.ctx,
+ custom: this.options.customTooltips
+ }).draw();
+
+ } else {
+ each(ChartElements, function(Element) {
+ var tooltipPosition = Element.tooltipPosition();
+ new Chart.Tooltip({
+ x: Math.round(tooltipPosition.x),
+ y: Math.round(tooltipPosition.y),
+ xPadding: this.options.tooltipXPadding,
+ yPadding: this.options.tooltipYPadding,
+ fillColor: this.options.tooltipFillColor,
+ textColor: this.options.tooltipFontColor,
+ fontFamily: this.options.tooltipFontFamily,
+ fontStyle: this.options.tooltipFontStyle,
+ fontSize: this.options.tooltipFontSize,
+ caretHeight: this.options.tooltipCaretSize,
+ cornerRadius: this.options.tooltipCornerRadius,
+ text: template(this.options.tooltipTemplate, Element),
+ chart: this.chart,
+ custom: this.options.customTooltips
+ }).draw();
+ }, this);
+ }
+ }
+ return this;
+ },
+ 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] = extend(baseDefaults,extensions.defaults);
+
+ Chart.types[chartName] = ChartType;
+
+ //Register this new chart type in the Chart prototype
+ Chart.prototype[chartName] = function(data,options){
+ var config = merge(Chart.defaults.global, Chart.defaults[chartName], options || {});
+ return new ChartType(data,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);
+ this.save();
+ };
+ extend(Chart.Element.prototype,{
+ initialize : function(){},
+ restore : function(props){
+ if (!props){
+ extend(this,this._saved);
+ } else {
+ each(props,function(key){
+ this[key] = this._saved[key];
+ },this);
+ }
+ return this;
+ },
+ save : function(){
+ this._saved = clone(this);
+ delete this._saved._saved;
+ return this;
+ },
+ update : function(newProps){
+ each(newProps,function(value,key){
+ this._saved[key] = this[key];
+ this[key] = value;
+ },this);
+ return this;
+ },
+ transition : function(props,ease){
+ each(props,function(value,key){
+ this[key] = ((value - this._saved[key]) * ease) + this._saved[key];
+ },this);
+ return this;
+ },
+ tooltipPosition : function(){
+ return {
+ x : this.x,
+ y : this.y
+ };
+ },
+ hasValue: function(){
+ return isNumber(this.value);
+ }
+ });
+
+ Chart.Element.extend = inherits;
+
+
+ Chart.Point = Chart.Element.extend({
+ display: true,
+ inRange: function(chartX,chartY){
+ var hitDetectionRange = this.hitDetectionRadius + this.radius;
+ return ((Math.pow(chartX-this.x, 2)+Math.pow(chartY-this.y, 2)) < Math.pow(hitDetectionRange,2));
+ },
+ draw : function(){
+ if (this.display){
+ var ctx = this.ctx;
+ ctx.beginPath();
+
+ ctx.arc(this.x, this.y, this.radius, 0, Math.PI*2);
+ ctx.closePath();
+
+ ctx.strokeStyle = this.strokeColor;
+ ctx.lineWidth = this.strokeWidth;
+
+ ctx.fillStyle = this.fillColor;
+
+ ctx.fill();
+ ctx.stroke();
+ }
+
+
+ //Quick debug for bezier curve splining
+ //Highlights control points and the line between them.
+ //Handy for dev - stripped in the min version.
+
+ // ctx.save();
+ // ctx.fillStyle = "black";
+ // ctx.strokeStyle = "black"
+ // ctx.beginPath();
+ // ctx.arc(this.controlPoints.inner.x,this.controlPoints.inner.y, 2, 0, Math.PI*2);
+ // ctx.fill();
+
+ // ctx.beginPath();
+ // ctx.arc(this.controlPoints.outer.x,this.controlPoints.outer.y, 2, 0, Math.PI*2);
+ // ctx.fill();
+
+ // ctx.moveTo(this.controlPoints.inner.x,this.controlPoints.inner.y);
+ // ctx.lineTo(this.x, this.y);
+ // ctx.lineTo(this.controlPoints.outer.x,this.controlPoints.outer.y);
+ // ctx.stroke();
+
+ // ctx.restore();
+
+
+
+ }
+ });
+
+ Chart.Arc = Chart.Element.extend({
+ inRange : function(chartX,chartY){
+
+ var pointRelativePosition = helpers.getAngleFromPoint(this, {
+ x: chartX,
+ y: chartY
+ });
+
+ //Check if within the range of the open/close angle
+ var betweenAngles = (pointRelativePosition.angle >= this.startAngle && pointRelativePosition.angle <= this.endAngle),
+ withinRadius = (pointRelativePosition.distance >= this.innerRadius && pointRelativePosition.distance <= this.outerRadius);
+
+ return (betweenAngles && withinRadius);
+ //Ensure within the outside of the arc centre, but inside arc outer
+ },
+ tooltipPosition : function(){
+ var centreAngle = this.startAngle + ((this.endAngle - this.startAngle) / 2),
+ rangeFromCentre = (this.outerRadius - this.innerRadius) / 2 + this.innerRadius;
+ return {
+ x : this.x + (Math.cos(centreAngle) * rangeFromCentre),
+ y : this.y + (Math.sin(centreAngle) * rangeFromCentre)
+ };
+ },
+ draw : function(animationPercent){
+
+ var easingDecimal = animationPercent || 1;
+
+ var ctx = this.ctx;
+
+ ctx.beginPath();
+
+ ctx.arc(this.x, this.y, this.outerRadius, this.startAngle, this.endAngle);
+
+ ctx.arc(this.x, this.y, this.innerRadius, this.endAngle, this.startAngle, true);
+
+ ctx.closePath();
+ ctx.strokeStyle = this.strokeColor;
+ ctx.lineWidth = this.strokeWidth;
+
+ ctx.fillStyle = this.fillColor;
+
+ ctx.fill();
+ ctx.lineJoin = 'bevel';
+
+ if (this.showStroke){
+ ctx.stroke();
+ }
+ }
+ });
+
+ Chart.Rectangle = Chart.Element.extend({
+ draw : function(){
+ var ctx = this.ctx,
+ halfWidth = this.width/2,
+ leftX = this.x - halfWidth,
+ rightX = this.x + halfWidth,
+ top = this.base - (this.base - this.y),
+ halfStroke = this.strokeWidth / 2;
+
+ // Canvas doesn't allow us to stroke inside the width so we can
+ // adjust the sizes to fit if we're setting a stroke on the line
+ if (this.showStroke){
+ leftX += halfStroke;
+ rightX -= halfStroke;
+ top += halfStroke;
+ }
+
+ ctx.beginPath();
+
+ ctx.fillStyle = this.fillColor;
+ ctx.strokeStyle = this.strokeColor;
+ ctx.lineWidth = this.strokeWidth;
+
+ // It'd be nice to keep this class totally generic to any rectangle
+ // and simply specify which border to miss out.
+ ctx.moveTo(leftX, this.base);
+ ctx.lineTo(leftX, top);
+ ctx.lineTo(rightX, top);
+ ctx.lineTo(rightX, this.base);
+ ctx.fill();
+ if (this.showStroke){
+ ctx.stroke();
+ }
+ },
+ height : function(){
+ return this.base - this.y;
+ },
+ inRange : function(chartX,chartY){
+ return (chartX >= this.x - this.width/2 && chartX <= this.x + this.width/2) && (chartY >= this.y && chartY <= this.base);
+ }
+ });
+
+ Chart.Animation = Chart.Element.extend({
+ currentStep: null, // the current animation step
+ numSteps: 60, // default number of steps
+ easing: "", // the easing to use for this animation
+ render: null, // render function used by the animation service
+
+ onAnimationProgress: null, // user specified callback to fire on each step of the animation
+ onAnimationComplete: null, // user specified callback to fire when the animation finishes
+ });
+
+ Chart.Tooltip = Chart.Element.extend({
+ draw : function(){
+
+ var ctx = this.chart.ctx;
+
+ ctx.font = fontString(this.fontSize,this.fontStyle,this.fontFamily);
+
+ this.xAlign = "center";
+ this.yAlign = "above";
+
+ //Distance between the actual element.y position and the start of the tooltip caret
+ var caretPadding = this.caretPadding = 2;
+
+ var tooltipWidth = ctx.measureText(this.text).width + 2*this.xPadding,
+ tooltipRectHeight = this.fontSize + 2*this.yPadding,
+ tooltipHeight = tooltipRectHeight + this.caretHeight + caretPadding;
+
+ if (this.x + tooltipWidth/2 >this.chart.width){
+ this.xAlign = "left";
+ } else if (this.x - tooltipWidth/2 < 0){
+ this.xAlign = "right";
+ }
+
+ if (this.y - tooltipHeight < 0){
+ this.yAlign = "below";
+ }
+
+
+ var tooltipX = this.x - tooltipWidth/2,
+ tooltipY = this.y - tooltipHeight;
+
+ ctx.fillStyle = this.fillColor;
+
+ // Custom Tooltips
+ if(this.custom){
+ this.custom(this);
+ }
+ else{
+ switch(this.yAlign)
+ {
+ case "above":
+ //Draw a caret above the x/y
+ ctx.beginPath();
+ ctx.moveTo(this.x,this.y - caretPadding);
+ ctx.lineTo(this.x + this.caretHeight, this.y - (caretPadding + this.caretHeight));
+ ctx.lineTo(this.x - this.caretHeight, this.y - (caretPadding + this.caretHeight));
+ ctx.closePath();
+ ctx.fill();
+ break;
+ case "below":
+ tooltipY = this.y + caretPadding + this.caretHeight;
+ //Draw a caret below the x/y
+ ctx.beginPath();
+ ctx.moveTo(this.x, this.y + caretPadding);
+ ctx.lineTo(this.x + this.caretHeight, this.y + caretPadding + this.caretHeight);
+ ctx.lineTo(this.x - this.caretHeight, this.y + caretPadding + this.caretHeight);
+ ctx.closePath();
+ ctx.fill();
+ break;
+ }
+
+ switch(this.xAlign)
+ {
+ case "left":
+ tooltipX = this.x - tooltipWidth + (this.cornerRadius + this.caretHeight);
+ break;
+ case "right":
+ tooltipX = this.x - (this.cornerRadius + this.caretHeight);
+ break;
+ }
+
+ drawRoundedRectangle(ctx,tooltipX,tooltipY,tooltipWidth,tooltipRectHeight,this.cornerRadius);
+
+ ctx.fill();
+
+ ctx.fillStyle = this.textColor;
+ ctx.textAlign = "center";
+ ctx.textBaseline = "middle";
+ ctx.fillText(this.text, tooltipX + tooltipWidth/2, tooltipY + tooltipRectHeight/2);
+ }
+ }
+ });
+
+ Chart.MultiTooltip = Chart.Element.extend({
+ initialize : function(){
+ this.font = fontString(this.fontSize,this.fontStyle,this.fontFamily);
+
+ this.titleFont = fontString(this.titleFontSize,this.titleFontStyle,this.titleFontFamily);
+
+ this.height = (this.labels.length * this.fontSize) + ((this.labels.length-1) * (this.fontSize/2)) + (this.yPadding*2) + this.titleFontSize *1.5;
+
+ this.ctx.font = this.titleFont;
+
+ var titleWidth = this.ctx.measureText(this.title).width,
+ //Label has a legend square as well so account for this.
+ labelWidth = longestText(this.ctx,this.font,this.labels) + this.fontSize + 3,
+ longestTextWidth = max([labelWidth,titleWidth]);
+
+ this.width = longestTextWidth + (this.xPadding*2);
+
+
+ var halfHeight = this.height/2;
+
+ //Check to ensure the height will fit on the canvas
+ if (this.y - halfHeight < 0 ){
+ this.y = halfHeight;
+ } else if (this.y + halfHeight > this.chart.height){
+ this.y = this.chart.height - halfHeight;
+ }
+
+ //Decide whether to align left or right based on position on canvas
+ if (this.x > this.chart.width/2){
+ this.x -= this.xOffset + this.width;
+ } else {
+ this.x += this.xOffset;
+ }
+
+
+ },
+ getLineHeight : function(index){
+ var baseLineHeight = this.y - (this.height/2) + this.yPadding,
+ afterTitleIndex = index-1;
+
+ //If the index is zero, we're getting the title
+ if (index === 0){
+ return baseLineHeight + this.titleFontSize/2;
+ } else{
+ return baseLineHeight + ((this.fontSize*1.5*afterTitleIndex) + this.fontSize/2) + this.titleFontSize * 1.5;
+ }
+
+ },
+ draw : function(){
+ // Custom Tooltips
+ if(this.custom){
+ this.custom(this);
+ }
+ else{
+ drawRoundedRectangle(this.ctx,this.x,this.y - this.height/2,this.width,this.height,this.cornerRadius);
+ var ctx = this.ctx;
+ ctx.fillStyle = this.fillColor;
+ ctx.fill();
+ ctx.closePath();
+
+ ctx.textAlign = "left";
+ ctx.textBaseline = "middle";
+ ctx.fillStyle = this.titleTextColor;
+ ctx.font = this.titleFont;
+
+ ctx.fillText(this.title,this.x + this.xPadding, this.getLineHeight(0));
+
+ ctx.font = this.font;
+ helpers.each(this.labels,function(label,index){
+ ctx.fillStyle = this.textColor;
+ ctx.fillText(label,this.x + this.xPadding + this.fontSize + 3, this.getLineHeight(index + 1));
+
+ //A bit gnarly, but clearing this rectangle breaks when using explorercanvas (clears whole canvas)
+ //ctx.clearRect(this.x + this.xPadding, this.getLineHeight(index + 1) - this.fontSize/2, this.fontSize, this.fontSize);
+ //Instead we'll make a white filled block to put the legendColour palette over.
+
+ ctx.fillStyle = this.legendColorBackground;
+ ctx.fillRect(this.x + this.xPadding, this.getLineHeight(index + 1) - this.fontSize/2, this.fontSize, this.fontSize);
+
+ ctx.fillStyle = this.legendColors[index].fill;
+ ctx.fillRect(this.x + this.xPadding, this.getLineHeight(index + 1) - this.fontSize/2, this.fontSize, this.fontSize);
+
+
+ },this);
+ }
+ }
+ });
+
+ Chart.Scale = Chart.Element.extend({
+ initialize : function(){
+ this.fit();
+ },
+ buildYLabels : function(){
+ this.yLabels = [];
+
+ var stepDecimalPlaces = getDecimalPlaces(this.stepValue);
+
+ for (var i=0; i<=this.steps; i++){
+ this.yLabels.push(template(this.templateString,{value:(this.min + (i * this.stepValue)).toFixed(stepDecimalPlaces)}));
+ }
+ this.yLabelWidth = (this.display && this.showLabels) ? longestText(this.ctx,this.font,this.yLabels) + 10 : 0;
+ },
+ addXLabel : function(label){
+ this.xLabels.push(label);
+ this.valuesCount++;
+ this.fit();
+ },
+ removeXLabel : function(){
+ this.xLabels.shift();
+ this.valuesCount--;
+ this.fit();
+ },
+ // Fitting loop to rotate x Labels and figure out what fits there, and also calculate how many Y steps to use
+ fit: function(){
+ // First we need the width of the yLabels, assuming the xLabels aren't rotated
+
+ // To do that we need the base line at the top and base of the chart, assuming there is no x label rotation
+ this.startPoint = (this.display) ? this.fontSize : 0;
+ this.endPoint = (this.display) ? this.height - (this.fontSize * 1.5) - 5 : this.height; // -5 to pad labels
+
+ // Apply padding settings to the start and end point.
+ this.startPoint += this.padding;
+ this.endPoint -= this.padding;
+
+ // Cache the starting endpoint, excluding the space for x labels
+ var cachedEndPoint = this.endPoint;
+
+ // Cache the starting height, so can determine if we need to recalculate the scale yAxis
+ var cachedHeight = this.endPoint - this.startPoint,
+ cachedYLabelWidth;
+
+ // Build the current yLabels so we have an idea of what size they'll be to start
+ /*
+ * This sets what is returned from calculateScaleRange as static properties of this class:
+ *
+ this.steps;
+ this.stepValue;
+ this.min;
+ this.max;
+ *
+ */
+ this.calculateYRange(cachedHeight);
+
+ // With these properties set we can now build the array of yLabels
+ // and also the width of the largest yLabel
+ this.buildYLabels();
+
+ this.calculateXLabelRotation();
+
+ while((cachedHeight > this.endPoint - this.startPoint)){
+ cachedHeight = this.endPoint - this.startPoint;
+ cachedYLabelWidth = this.yLabelWidth;
+
+ this.calculateYRange(cachedHeight);
+ this.buildYLabels();
+
+ // Only go through the xLabel loop again if the yLabel width has changed
+ if (cachedYLabelWidth < this.yLabelWidth){
+ this.endPoint = cachedEndPoint;
+ this.calculateXLabelRotation();
+ }
+ }
+
+ },
+ calculateXLabelRotation : function(){
+ //Get the width of each grid by calculating the difference
+ //between x offsets between 0 and 1.
+
+ this.ctx.font = this.font;
+
+ var firstWidth = this.ctx.measureText(this.xLabels[0]).width,
+ lastWidth = this.ctx.measureText(this.xLabels[this.xLabels.length - 1]).width,
+ firstRotated,
+ lastRotated;
+
+
+ this.xScalePaddingRight = lastWidth/2 + 3;
+ this.xScalePaddingLeft = (firstWidth/2 > this.yLabelWidth) ? firstWidth/2 : this.yLabelWidth;
+
+ this.xLabelRotation = 0;
+ if (this.display){
+ var originalLabelWidth = longestText(this.ctx,this.font,this.xLabels),
+ cosRotation,
+ firstRotatedWidth;
+ this.xLabelWidth = originalLabelWidth;
+ //Allow 3 pixels x2 padding either side for label readability
+ var xGridWidth = Math.floor(this.calculateX(1) - this.calculateX(0)) - 6;
+
+ //Max label rotate should be 90 - also act as a loop counter
+ while ((this.xLabelWidth > xGridWidth && this.xLabelRotation === 0) || (this.xLabelWidth > xGridWidth && this.xLabelRotation <= 90 && this.xLabelRotation > 0)){
+ cosRotation = Math.cos(toRadians(this.xLabelRotation));
+
+ firstRotated = cosRotation * firstWidth;
+ lastRotated = cosRotation * lastWidth;
+
+ // We're right aligning the text now.
+ if (firstRotated + this.fontSize / 2 > this.yLabelWidth){
+ this.xScalePaddingLeft = firstRotated + this.fontSize / 2;
+ }
+ this.xScalePaddingRight = this.fontSize/2;
+
+
+ this.xLabelRotation++;
+ this.xLabelWidth = cosRotation * originalLabelWidth;
+
+ }
+ if (this.xLabelRotation > 0){
+ this.endPoint -= Math.sin(toRadians(this.xLabelRotation))*originalLabelWidth + 3;
+ }
+ }
+ else{
+ this.xLabelWidth = 0;
+ this.xScalePaddingRight = this.padding;
+ this.xScalePaddingLeft = this.padding;
+ }
+
+ },
+ // Needs to be overidden in each Chart type
+ // Otherwise we need to pass all the data into the scale class
+ calculateYRange: noop,
+ drawingArea: function(){
+ return this.startPoint - this.endPoint;
+ },
+ calculateY : function(value){
+ var scalingFactor = this.drawingArea() / (this.min - this.max);
+ return this.endPoint - (scalingFactor * (value - this.min));
+ },
+ calculateX : function(index){
+ var isRotated = (this.xLabelRotation > 0),
+ // innerWidth = (this.offsetGridLines) ? this.width - offsetLeft - this.padding : this.width - (offsetLeft + halfLabelWidth * 2) - this.padding,
+ innerWidth = this.width - (this.xScalePaddingLeft + this.xScalePaddingRight),
+ valueWidth = innerWidth/Math.max((this.valuesCount - ((this.offsetGridLines) ? 0 : 1)), 1),
+ valueOffset = (valueWidth * index) + this.xScalePaddingLeft;
+
+ if (this.offsetGridLines){
+ valueOffset += (valueWidth/2);
+ }
+
+ return Math.round(valueOffset);
+ },
+ update : function(newProps){
+ helpers.extend(this, newProps);
+ this.fit();
+ },
+ draw : function(){
+ var ctx = this.ctx,
+ yLabelGap = (this.endPoint - this.startPoint) / this.steps,
+ xStart = Math.round(this.xScalePaddingLeft);
+ if (this.display){
+ ctx.fillStyle = this.textColor;
+ ctx.font = this.font;
+ each(this.yLabels,function(labelString,index){
+ var yLabelCenter = this.endPoint - (yLabelGap * index),
+ linePositionY = Math.round(yLabelCenter),
+ drawHorizontalLine = this.showHorizontalLines;
+
+ ctx.textAlign = "right";
+ ctx.textBaseline = "middle";
+ if (this.showLabels){
+ ctx.fillText(labelString,xStart - 10,yLabelCenter);
+ }
+
+ // This is X axis, so draw it
+ if (index === 0 && !drawHorizontalLine){
+ drawHorizontalLine = true;
+ }
+
+ if (drawHorizontalLine){
+ ctx.beginPath();
+ }
+
+ if (index > 0){
+ // This is a grid line in the centre, so drop that
+ ctx.lineWidth = this.gridLineWidth;
+ ctx.strokeStyle = this.gridLineColor;
+ } else {
+ // This is the first line on the scale
+ ctx.lineWidth = this.lineWidth;
+ ctx.strokeStyle = this.lineColor;
+ }
+
+ linePositionY += helpers.aliasPixel(ctx.lineWidth);
+
+ if(drawHorizontalLine){
+ ctx.moveTo(xStart, linePositionY);
+ ctx.lineTo(this.width, linePositionY);
+ ctx.stroke();
+ ctx.closePath();
+ }
+
+ ctx.lineWidth = this.lineWidth;
+ ctx.strokeStyle = this.lineColor;
+ ctx.beginPath();
+ ctx.moveTo(xStart - 5, linePositionY);
+ ctx.lineTo(xStart, linePositionY);
+ ctx.stroke();
+ ctx.closePath();
+
+ },this);
+
+ each(this.xLabels,function(label,index){
+ var xPos = this.calculateX(index) + aliasPixel(this.lineWidth),
+ // Check to see if line/bar here and decide where to place the line
+ linePos = this.calculateX(index - (this.offsetGridLines ? 0.5 : 0)) + aliasPixel(this.lineWidth),
+ isRotated = (this.xLabelRotation > 0),
+ drawVerticalLine = this.showVerticalLines;
+
+ // This is Y axis, so draw it
+ if (index === 0 && !drawVerticalLine){
+ drawVerticalLine = true;
+ }
+
+ if (drawVerticalLine){
+ ctx.beginPath();
+ }
+
+ if (index > 0){
+ // This is a grid line in the centre, so drop that
+ ctx.lineWidth = this.gridLineWidth;
+ ctx.strokeStyle = this.gridLineColor;
+ } else {
+ // This is the first line on the scale
+ ctx.lineWidth = this.lineWidth;
+ ctx.strokeStyle = this.lineColor;
+ }
+
+ if (drawVerticalLine){
+ ctx.moveTo(linePos,this.endPoint);
+ ctx.lineTo(linePos,this.startPoint - 3);
+ ctx.stroke();
+ ctx.closePath();
+ }
+
+
+ ctx.lineWidth = this.lineWidth;
+ ctx.strokeStyle = this.lineColor;
+
+
+ // Small lines at the bottom of the base grid line
+ ctx.beginPath();
+ ctx.moveTo(linePos,this.endPoint);
+ ctx.lineTo(linePos,this.endPoint + 5);
+ ctx.stroke();
+ ctx.closePath();
+
+ ctx.save();
+ ctx.translate(xPos,(isRotated) ? this.endPoint + 12 : this.endPoint + 8);
+ ctx.rotate(toRadians(this.xLabelRotation)*-1);
+ ctx.font = this.font;
+ ctx.textAlign = (isRotated) ? "right" : "center";
+ ctx.textBaseline = (isRotated) ? "middle" : "top";
+ ctx.fillText(label, 0, 0);
+ ctx.restore();
+ },this);
+
+ }
+ }
+
+ });
+
+ Chart.RadialScale = Chart.Element.extend({
+ initialize: function(){
+ this.size = min([this.height, this.width]);
+ this.drawingArea = (this.display) ? (this.size/2) - (this.fontSize/2 + this.backdropPaddingY) : (this.size/2);
+ },
+ calculateCenterOffset: function(value){
+ // Take into account half font size + the yPadding of the top value
+ var scalingFactor = this.drawingArea / (this.max - this.min);
+
+ return (value - this.min) * scalingFactor;
+ },
+ update : function(){
+ if (!this.lineArc){
+ this.setScaleSize();
+ } else {
+ this.drawingArea = (this.display) ? (this.size/2) - (this.fontSize/2 + this.backdropPaddingY) : (this.size/2);
+ }
+ this.buildYLabels();
+ },
+ buildYLabels: function(){
+ this.yLabels = [];
+
+ var stepDecimalPlaces = getDecimalPlaces(this.stepValue);
+
+ for (var i=0; i<=this.steps; i++){
+ this.yLabels.push(template(this.templateString,{value:(this.min + (i * this.stepValue)).toFixed(stepDecimalPlaces)}));
+ }
+ },
+ getCircumference : function(){
+ return ((Math.PI*2) / this.valuesCount);
+ },
+ setScaleSize: function(){
+ /*
+ * Right, this is really confusing and there is a lot of maths going on here
+ * The gist of the problem is here: https://gist.github.com/nnnick/696cc9c55f4b0beb8fe9
+ *
+ * Reaction: https://dl.dropboxusercontent.com/u/34601363/toomuchscience.gif
+ *
+ * Solution:
+ *
+ * We assume the radius of the polygon is half the size of the canvas at first
+ * at each index we check if the text overlaps.
+ *
+ * Where it does, we store that angle and that index.
+ *
+ * After finding the largest index and angle we calculate how much we need to remove
+ * from the shape radius to move the point inwards by that x.
+ *
+ * We average the left and right distances to get the maximum shape radius that can fit in the box
+ * along with labels.
+ *
+ * Once we have that, we can find the centre point for the chart, by taking the x text protrusion
+ * on each side, removing that from the size, halving it and adding the left x protrusion width.
+ *
+ * This will mean we have a shape fitted to the canvas, as large as it can be with the labels
+ * and position it in the most space efficient manner
+ *
+ * https://dl.dropboxusercontent.com/u/34601363/yeahscience.gif
+ */
+
+
+ // Get maximum radius of the polygon. Either half the height (minus the text width) or half the width.
+ // Use this to calculate the offset + change. - Make sure L/R protrusion is at least 0 to stop issues with centre points
+ var largestPossibleRadius = min([(this.height/2 - this.pointLabelFontSize - 5), this.width/2]),
+ pointPosition,
+ i,
+ textWidth,
+ halfTextWidth,
+ furthestRight = this.width,
+ furthestRightIndex,
+ furthestRightAngle,
+ furthestLeft = 0,
+ furthestLeftIndex,
+ furthestLeftAngle,
+ xProtrusionLeft,
+ xProtrusionRight,
+ radiusReductionRight,
+ radiusReductionLeft,
+ maxWidthRadius;
+ this.ctx.font = fontString(this.pointLabelFontSize,this.pointLabelFontStyle,this.pointLabelFontFamily);
+ for (i=0;i<this.valuesCount;i++){
+ // 5px to space the text slightly out - similar to what we do in the draw function.
+ pointPosition = this.getPointPosition(i, largestPossibleRadius);
+ textWidth = this.ctx.measureText(template(this.templateString, { value: this.labels[i] })).width + 5;
+ if (i === 0 || i === this.valuesCount/2){
+ // If we're at index zero, or exactly the middle, we're at exactly the top/bottom
+ // of the radar chart, so text will be aligned centrally, so we'll half it and compare
+ // w/left and right text sizes
+ halfTextWidth = textWidth/2;
+ if (pointPosition.x + halfTextWidth > furthestRight) {
+ furthestRight = pointPosition.x + halfTextWidth;
+ furthestRightIndex = i;
+ }
+ if (pointPosition.x - halfTextWidth < furthestLeft) {
+ furthestLeft = pointPosition.x - halfTextWidth;
+ furthestLeftIndex = i;
+ }
+ }
+ else if (i < this.valuesCount/2) {
+ // Less than half the values means we'll left align the text
+ if (pointPosition.x + textWidth > furthestRight) {
+ furthestRight = pointPosition.x + textWidth;
+ furthestRightIndex = i;
+ }
+ }
+ else if (i > this.valuesCount/2){
+ // More than half the values means we'll right align the text
+ if (pointPosition.x - textWidth < furthestLeft) {
+ furthestLeft = pointPosition.x - textWidth;
+ furthestLeftIndex = i;
+ }
+ }
+ }
+
+ xProtrusionLeft = furthestLeft;
+
+ xProtrusionRight = Math.ceil(furthestRight - this.width);
+
+ furthestRightAngle = this.getIndexAngle(furthestRightIndex);
+
+ furthestLeftAngle = this.getIndexAngle(furthestLeftIndex);
+
+ radiusReductionRight = xProtrusionRight / Math.sin(furthestRightAngle + Math.PI/2);
+
+ radiusReductionLeft = xProtrusionLeft / Math.sin(furthestLeftAngle + Math.PI/2);
+
+ // Ensure we actually need to reduce the size of the chart
+ radiusReductionRight = (isNumber(radiusReductionRight)) ? radiusReductionRight : 0;
+ radiusReductionLeft = (isNumber(radiusReductionLeft)) ? radiusReductionLeft : 0;
+
+ this.drawingArea = largestPossibleRadius - (radiusReductionLeft + radiusReductionRight)/2;
+
+ //this.drawingArea = min([maxWidthRadius, (this.height - (2 * (this.pointLabelFontSize + 5)))/2])
+ this.setCenterPoint(radiusReductionLeft, radiusReductionRight);
+
+ },
+ setCenterPoint: function(leftMovement, rightMovement){
+
+ var maxRight = this.width - rightMovement - this.drawingArea,
+ maxLeft = leftMovement + this.drawingArea;
+
+ this.xCenter = (maxLeft + maxRight)/2;
+ // Always vertically in the centre as the text height doesn't change
+ this.yCenter = (this.height/2);
+ },
+
+ getIndexAngle : function(index){
+ var angleMultiplier = (Math.PI * 2) / this.valuesCount;
+ // Start from the top instead of right, so remove a quarter of the circle
+
+ return index * angleMultiplier - (Math.PI/2);
+ },
+ getPointPosition : function(index, distanceFromCenter){
+ var thisAngle = this.getIndexAngle(index);
+ return {
+ x : (Math.cos(thisAngle) * distanceFromCenter) + this.xCenter,
+ y : (Math.sin(thisAngle) * distanceFromCenter) + this.yCenter
+ };
+ },
+ draw: function(){
+ if (this.display){
+ var ctx = this.ctx;
+ each(this.yLabels, function(label, index){
+ // Don't draw a centre value
+ if (index > 0){
+ var yCenterOffset = index * (this.drawingArea/this.steps),
+ yHeight = this.yCenter - yCenterOffset,
+ pointPosition;
+
+ // Draw circular lines around the scale
+ if (this.lineWidth > 0){
+ ctx.strokeStyle = this.lineColor;
+ ctx.lineWidth = this.lineWidth;
+
+ if(this.lineArc){
+ ctx.beginPath();
+ ctx.arc(this.xCenter, this.yCenter, yCenterOffset, 0, Math.PI*2);
+ ctx.closePath();
+ ctx.stroke();
+ } else{
+ ctx.beginPath();
+ for (var i=0;i<this.valuesCount;i++)
+ {
+ pointPosition = this.getPointPosition(i, this.calculateCenterOffset(this.min + (index * this.stepValue)));
+ if (i === 0){
+ ctx.moveTo(pointPosition.x, pointPosition.y);
+ } else {
+ ctx.lineTo(pointPosition.x, pointPosition.y);
+ }
+ }
+ ctx.closePath();
+ ctx.stroke();
+ }
+ }
+ if(this.showLabels){
+ ctx.font = fontString(this.fontSize,this.fontStyle,this.fontFamily);
+ if (this.showLabelBackdrop){
+ var labelWidth = ctx.measureText(label).width;
+ ctx.fillStyle = this.backdropColor;
+ ctx.fillRect(
+ this.xCenter - labelWidth/2 - this.backdropPaddingX,
+ yHeight - this.fontSize/2 - this.backdropPaddingY,
+ labelWidth + this.backdropPaddingX*2,
+ this.fontSize + this.backdropPaddingY*2
+ );
+ }
+ ctx.textAlign = 'center';
+ ctx.textBaseline = "middle";
+ ctx.fillStyle = this.fontColor;
+ ctx.fillText(label, this.xCenter, yHeight);
+ }
+ }
+ }, this);
+
+ if (!this.lineArc){
+ ctx.lineWidth = this.angleLineWidth;
+ ctx.strokeStyle = this.angleLineColor;
+ for (var i = this.valuesCount - 1; i >= 0; i--) {
+ if (this.angleLineWidth > 0){
+ var outerPosition = this.getPointPosition(i, this.calculateCenterOffset(this.max));
+ ctx.beginPath();
+ ctx.moveTo(this.xCenter, this.yCenter);
+ ctx.lineTo(outerPosition.x, outerPosition.y);
+ ctx.stroke();
+ ctx.closePath();
+ }
+ // Extra 3px out for some label spacing
+ var pointLabelPosition = this.getPointPosition(i, this.calculateCenterOffset(this.max) + 5);
+ ctx.font = fontString(this.pointLabelFontSize,this.pointLabelFontStyle,this.pointLabelFontFamily);
+ ctx.fillStyle = this.pointLabelFontColor;
+
+ var labelsCount = this.labels.length,
+ halfLabelsCount = this.labels.length/2,
+ quarterLabelsCount = halfLabelsCount/2,
+ upperHalf = (i < quarterLabelsCount || i > labelsCount - quarterLabelsCount),
+ exactQuarter = (i === quarterLabelsCount || i === labelsCount - quarterLabelsCount);
+ if (i === 0){
+ ctx.textAlign = 'center';
+ } else if(i === halfLabelsCount){
+ ctx.textAlign = 'center';
+ } else if (i < halfLabelsCount){
+ ctx.textAlign = 'left';
+ } else {
+ ctx.textAlign = 'right';
+ }
+
+ // Set the correct text baseline based on outer positioning
+ if (exactQuarter){
+ ctx.textBaseline = 'middle';
+ } else if (upperHalf){
+ ctx.textBaseline = 'bottom';
+ } else {
+ ctx.textBaseline = 'top';
+ }
+
+ ctx.fillText(this.labels[i], pointLabelPosition.x, pointLabelPosition.y);
+ }
+ }
+ }
+ }
+ });
+
+ Chart.animationService = {
+ frameDuration: 17,
+ animations: [],
+ dropFrames: 0,
+ addAnimation: function(chartInstance, animationObject) {
+ for (var index = 0; index < this.animations.length; ++ index){
+ if (this.animations[index].chartInstance === chartInstance){
+ // replacing an in progress animation
+ this.animations[index].animationObject = animationObject;
+ return;
+ }
+ }
+
+ this.animations.push({
+ chartInstance: chartInstance,
+ animationObject: animationObject
+ });
+
+ // If there are no animations queued, manually kickstart a digest, for lack of a better word
+ if (this.animations.length == 1) {
+ helpers.requestAnimFrame.call(window, this.digestWrapper);
+ }
+ },
+ // Cancel the animation for a given chart instance
+ cancelAnimation: function(chartInstance) {
+ var index = helpers.findNextWhere(this.animations, function(animationWrapper) {
+ return animationWrapper.chartInstance === chartInstance;
+ });
+
+ if (index)
+ {
+ this.animations.splice(index, 1);
+ }
+ },
+ // calls startDigest with the proper context
+ digestWrapper: function() {
+ Chart.animationService.startDigest.call(Chart.animationService);
+ },
+ startDigest: function() {
+
+ var startTime = Date.now();
+ var framesToDrop = 0;
+
+ if(this.dropFrames > 1){
+ framesToDrop = Math.floor(this.dropFrames);
+ this.dropFrames -= framesToDrop;
+ }
+
+ for (var i = 0; i < this.animations.length; i++) {
+
+ if (this.animations[i].animationObject.currentStep === null){
+ this.animations[i].animationObject.currentStep = 0;
+ }
+
+ this.animations[i].animationObject.currentStep += 1 + framesToDrop;
+ if(this.animations[i].animationObject.currentStep > this.animations[i].animationObject.numSteps){
+ this.animations[i].animationObject.currentStep = this.animations[i].animationObject.numSteps;
+ }
+
+ this.animations[i].animationObject.render(this.animations[i].chartInstance, this.animations[i].animationObject);
+
+ if (this.animations[i].animationObject.currentStep == this.animations[i].animationObject.numSteps){
+ // executed the last frame. Remove the animation.
+ this.animations.splice(i, 1);
+ // Keep the index in place to offset the splice
+ i--;
+ }
+ }
+
+ var endTime = Date.now();
+ var delay = endTime - startTime - this.frameDuration;
+ var frameDelay = delay / this.frameDuration;
+
+ if(frameDelay > 1){
+ this.dropFrames += frameDelay;
+ }
+
+ // Do we have more stuff to animate?
+ if (this.animations.length > 0){
+ helpers.requestAnimFrame.call(window, this.digestWrapper);
+ }
+ }
+ };
+
+ // 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.render, true);
+ }
+ });
+ }, 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);
projects / soho-sigint.git / blobdiff