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File: bootstrap/chartjs/src/Chart.Core.js

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File: bootstrap/chartjs/src/Chart.Core.js
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/*! * 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);