如何用chart.js制作长尾词趋势折线图？

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Chart.js 是一个开源的图表库，用于在网页上创建交互式图表。版本：1.0.1-beta.4。版权：Nick Downie。许可证：MIT。详情请访问 http://chartjs.org/。

chart.js

/*! * Chart.js * chartjs.org/ * Version: 1.0.1-beta.4 * * Copyright 2014 Nick Downie * Released under the MIT license * 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 width = this.width = context.canvas.width; var 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, // 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 = 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)){ return num.toString().split(".")[1].length; } 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 //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 seperation 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 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 (labelTemplateString){ 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 //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 - 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; // TODO = check cross browser stuff with this. return container.clientWidth; }, getMaximumHeight = helpers.getMaximumHeight = function(domNode){ var container = domNode.parentNode; // TODO = check cross browser stuff with this. return container.clientHeight; }, 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 helpers.cancelAnimFrame.call(root, this.animationFrame); 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){ helpers.animationLoop( this.draw, this.options.animationSteps, this.options.animationEasing, this.options.onAnimationProgress, this.options.onAnimationComplete, this ); } 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); 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 (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 }).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 }).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.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 = 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; 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 //The three is to buffer form the very 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(){ 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) : 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 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.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 + 10) ? firstWidth/2 : this.yLabelWidth + 10; 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 + 8){ 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/(this.valuesCount - ((this.offsetGridLines) ? 0 : 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); ctx.textAlign = "right"; ctx.textBaseline = "middle"; if (this.showLabels){ ctx.fillText(labelString,xStart - 10,yLabelCenter); } 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); 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); 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; } 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: gist.github.com/nnnick/696cc9c55f4b0beb8fe9 * * Reaction: 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 * * 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 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 = 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); } } } } }); // 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); (function(){ "use strict"; var root = this, Chart = root.Chart, helpers = Chart.helpers; var defaultConfig = { //Boolean - Whether the scale should start at zero, or an order of magnitude down from the lowest value scaleBeginAtZero : true, //Boolean - Whether grid lines are shown across the chart scaleShowGridLines : true, //String - Colour of the grid lines scaleGridLineColor : "rgba(0,0,0,.05)", //Number - Width of the grid lines scaleGridLineWidth : 1, //Boolean - If there is a stroke on each bar barShowStroke : true, //Number - Pixel width of the bar stroke barStrokeWidth : 2, //Number - Spacing between each of the X value sets barValueSpacing : 5, //Number - Spacing between data sets within X values barDatasetSpacing : 1, //String - A legend template legendTemplate : "

-legend\"><% for (var i=0; i
• \"><%if(datasets[i].label){%><%=datasets[i].label%><%}%>
<%}%>

" }; Chart.Type.extend({ name: "Bar", defaults : defaultConfig, initialize: function(data){ //Expose options as a scope variable here so we can access it in the ScaleClass var options = this.options; this.ScaleClass = Chart.Scale.extend({ offsetGridLines : true, calculateBarX : function(datasetCount, datasetIndex, barIndex){ //Reusable method for calculating the xPosition of a given bar based on datasetIndex & width of the bar var xWidth = this.calculateBaseWidth(), xAbsolute = this.calculateX(barIndex) - (xWidth/2), barWidth = this.calculateBarWidth(datasetCount); return xAbsolute + (barWidth * datasetIndex) + (datasetIndex * options.barDatasetSpacing) + barWidth/2; }, calculateBaseWidth : function(){ return (this.calculateX(1) - this.calculateX(0)) - (2*options.barValueSpacing); }, calculateBarWidth : function(datasetCount){ //The padding between datasets is to the right of each bar, providing that there are more than 1 dataset var baseWidth = this.calculateBaseWidth() - ((datasetCount - 1) * options.barDatasetSpacing); return (baseWidth / datasetCount); } }); this.datasets = []; //Set up tooltip events on the chart if (this.options.showTooltips){ helpers.bindEvents(this, this.options.tooltipEvents, function(evt){ var activeBars = (evt.type !== 'mouseout') ? this.getBarsAtEvent(evt) : []; this.eachBars(function(bar){ bar.restore(['fillColor', 'strokeColor']); }); helpers.each(activeBars, function(activeBar){ activeBar.fillColor = activeBar.highlightFill; activeBar.strokeColor = activeBar.highlightStroke; }); this.showTooltip(activeBars); }); } //Declare the extension of the default point, to cater for the options passed in to the constructor this.BarClass = Chart.Rectangle.extend({ strokeWidth : this.options.barStrokeWidth, showStroke : this.options.barShowStroke, ctx : this.chart.ctx }); //Iterate through each of the datasets, and build this into a property of the chart helpers.each(data.datasets,function(dataset,datasetIndex){ var datasetObject = { label : dataset.label || null, fillColor : dataset.fillColor, strokeColor : dataset.strokeColor, bars : [] }; this.datasets.push(datasetObject); helpers.each(dataset.data,function(dataPoint,index){ //Add a new point for each piece of data, passing any required data to draw. datasetObject.bars.push(new this.BarClass({ value : dataPoint, label : data.labels[index], datasetLabel: dataset.label, strokeColor : dataset.strokeColor, fillColor : dataset.fillColor, highlightFill : dataset.highlightFill || dataset.fillColor, highlightStroke : dataset.highlightStroke || dataset.strokeColor })); },this); },this); this.buildScale(data.labels); this.BarClass.prototype.base = this.scale.endPoint; this.eachBars(function(bar, index, datasetIndex){ helpers.extend(bar, { width : this.scale.calculateBarWidth(this.datasets.length), x: this.scale.calculateBarX(this.datasets.length, datasetIndex, index), y: this.scale.endPoint }); bar.save(); }, this); this.render(); }, update : function(){ this.scale.update(); // Reset any highlight colours before updating. helpers.each(this.activeElements, function(activeElement){ activeElement.restore(['fillColor', 'strokeColor']); }); this.eachBars(function(bar){ bar.save(); }); this.render(); }, eachBars : function(callback){ helpers.each(this.datasets,function(dataset, datasetIndex){ helpers.each(dataset.bars, callback, this, datasetIndex); },this); }, getBarsAtEvent : function(e){ var barsArray = [], eventPosition = helpers.getRelativePosition(e), datasetIterator = function(dataset){ barsArray.push(dataset.bars[barIndex]); }, barIndex; for (var datasetIndex = 0; datasetIndex < this.datasets.length; datasetIndex++) { for (barIndex = 0; barIndex < this.datasets[datasetIndex].bars.length; barIndex++) { if (this.datasets[datasetIndex].bars[barIndex].inRange(eventPosition.x,eventPosition.y)){ helpers.each(this.datasets, datasetIterator); return barsArray; } } } return barsArray; }, buildScale : function(labels){ var self = this; var dataTotal = function(){ var values = []; self.eachBars(function(bar){ values.push(bar.value); }); return values; }; var scaleOptions = { templateString : this.options.scaleLabel, height : this.chart.height, width : this.chart.width, ctx : this.chart.ctx, textColor : this.options.scaleFontColor, fontSize : this.options.scaleFontSize, fontStyle : this.options.scaleFontStyle, fontFamily : this.options.scaleFontFamily, valuesCount : labels.length, beginAtZero : this.options.scaleBeginAtZero, integersOnly : this.options.scaleIntegersOnly, calculateYRange: function(currentHeight){ var updatedRanges = helpers.calculateScaleRange( dataTotal(), currentHeight, this.fontSize, this.beginAtZero, this.integersOnly ); helpers.extend(this, updatedRanges); }, xLabels : labels, font : helpers.fontString(this.options.scaleFontSize, this.options.scaleFontStyle, this.options.scaleFontFamily), lineWidth : this.options.scaleLineWidth, lineColor : this.options.scaleLineColor, gridLineWidth : (this.options.scaleShowGridLines) ? this.options.scaleGridLineWidth : 0, gridLineColor : (this.options.scaleShowGridLines) ? this.options.scaleGridLineColor : "rgba(0,0,0,0)", padding : (this.options.showScale) ? 0 : (this.options.barShowStroke) ? this.options.barStrokeWidth : 0, showLabels : this.options.scaleShowLabels, display : this.options.showScale }; if (this.options.scaleOverride){ helpers.extend(scaleOptions, { calculateYRange: helpers.noop, steps: this.options.scaleSteps, stepValue: this.options.scaleStepWidth, min: this.options.scaleStartValue, max: this.options.scaleStartValue + (this.options.scaleSteps * this.options.scaleStepWidth) }); } this.scale = new this.ScaleClass(scaleOptions); }, addData : function(valuesArray,label){ //Map the values array for each of the datasets helpers.each(valuesArray,function(value,datasetIndex){ //Add a new point for each piece of data, passing any required data to draw. this.datasets[datasetIndex].bars.push(new this.BarClass({ value : value, label : label, x: this.scale.calculateBarX(this.datasets.length, datasetIndex, this.scale.valuesCount+1), y: this.scale.endPoint, width : this.scale.calculateBarWidth(this.datasets.length), base : this.scale.endPoint, strokeColor : this.datasets[datasetIndex].strokeColor, fillColor : this.datasets[datasetIndex].fillColor })); },this); this.scale.addXLabel(label); //Then re-render the chart. this.update(); }, removeData : function(){ this.scale.removeXLabel(); //Then re-render the chart. helpers.each(this.datasets,function(dataset){ dataset.bars.shift(); },this); this.update(); }, reflow : function(){ helpers.extend(this.BarClass.prototype,{ y: this.scale.endPoint, base : this.scale.endPoint }); var newScaleProps = helpers.extend({ height : this.chart.height, width : this.chart.width }); this.scale.update(newScaleProps); }, draw : function(ease){ var easingDecimal = ease || 1; this.clear(); var ctx = this.chart.ctx; this.scale.draw(easingDecimal); //Draw all the bars for each dataset helpers.each(this.datasets,function(dataset,datasetIndex){ helpers.each(dataset.bars,function(bar,index){ if (bar.hasValue()){ bar.base = this.scale.endPoint; //Transition then draw bar.transition({ x : this.scale.calculateBarX(this.datasets.length, datasetIndex, index), y : this.scale.calculateY(bar.value), width : this.scale.calculateBarWidth(this.datasets.length) }, easingDecimal).draw(); } },this); },this); } }); }).call(this); (function(){ "use strict"; var root = this, Chart = root.Chart, //Cache a local reference to Chart.helpers helpers = Chart.helpers; var defaultConfig = { //Boolean - Whether we should show a stroke on each segment segmentShowStroke : true, //String - The colour of each segment stroke segmentStrokeColor : "#fff", //Number - The width of each segment stroke segmentStrokeWidth : 2, //The percentage of the chart that we cut out of the middle. percentageInnerCutout : 50, //Number - Amount of animation steps animationSteps : 100, //String - Animation easing effect animationEasing : "easeOutBounce", //Boolean - Whether we animate the rotation of the Doughnut animateRotate : true, //Boolean - Whether we animate scaling the Doughnut from the centre animateScale : false, //String - A legend template legendTemplate : "

-legend\"><% for (var i=0; i
• \"><%if(segments[i].label){%><%=segments[i].label%><%}%>
<%}%>

" }; Chart.Type.extend({ //Passing in a name registers this chart in the Chart namespace name: "Doughnut", //Providing a defaults will also register the deafults in the chart namespace defaults : defaultConfig, //Initialize is fired when the chart is initialized - Data is passed in as a parameter //Config is automatically merged by the core of Chart.js, and is available at this.options initialize: function(data){ //Declare segments as a static property to prevent inheriting across the Chart type prototype this.segments = []; this.outerRadius = (helpers.min([this.chart.width,this.chart.height]) - this.options.segmentStrokeWidth/2)/2; this.SegmentArc = Chart.Arc.extend({ ctx : this.chart.ctx, x : this.chart.width/2, y : this.chart.height/2 }); //Set up tooltip events on the chart if (this.options.showTooltips){ helpers.bindEvents(this, this.options.tooltipEvents, function(evt){ var activeSegments = (evt.type !== 'mouseout') ? this.getSegmentsAtEvent(evt) : []; helpers.each(this.segments,function(segment){ segment.restore(["fillColor"]); }); helpers.each(activeSegments,function(activeSegment){ activeSegment.fillColor = activeSegment.highlightColor; }); this.showTooltip(activeSegments); }); } this.calculateTotal(data); helpers.each(data,function(datapoint, index){ this.addData(datapoint, index, true); },this); this.render(); }, getSegmentsAtEvent : function(e){ var segmentsArray = []; var location = helpers.getRelativePosition(e); helpers.each(this.segments,function(segment){ if (segment.inRange(location.x,location.y)) segmentsArray.push(segment); },this); return segmentsArray; }, addData : function(segment, atIndex, silent){ var index = atIndex || this.segments.length; this.segments.splice(index, 0, new this.SegmentArc({ value : segment.value, outerRadius : (this.options.animateScale) ? 0 : this.outerRadius, innerRadius : (this.options.animateScale) ? 0 : (this.outerRadius/100) * this.options.percentageInnerCutout, fillColor : segment.color, highlightColor : segment.highlight || segment.color, showStroke : this.options.segmentShowStroke, strokeWidth : this.options.segmentStrokeWidth, strokeColor : this.options.segmentStrokeColor, startAngle : Math.PI * 1.5, circumference : (this.options.animateRotate) ? 0 : this.calculateCircumference(segment.value), label : segment.label })); if (!silent){ this.reflow(); this.update(); } }, calculateCircumference : function(value){ return (Math.PI*2)*(value / this.total); }, calculateTotal : function(data){ this.total = 0; helpers.each(data,function(segment){ this.total += segment.value; },this); }, update : function(){ this.calculateTotal(this.segments); // Reset any highlight colours before updating. helpers.each(this.activeElements, function(activeElement){ activeElement.restore(['fillColor']); }); helpers.each(this.segments,function(segment){ segment.save(); }); this.render(); }, removeData: function(atIndex){ var indexToDelete = (helpers.isNumber(atIndex)) ? atIndex : this.segments.length-1; this.segments.splice(indexToDelete, 1); this.reflow(); this.update(); }, reflow : function(){ helpers.extend(this.SegmentArc.prototype,{ x : this.chart.width/2, y : this.chart.height/2 }); this.outerRadius = (helpers.min([this.chart.width,this.chart.height]) - this.options.segmentStrokeWidth/2)/2; helpers.each(this.segments, function(segment){ segment.update({ outerRadius : this.outerRadius, innerRadius : (this.outerRadius/100) * this.options.percentageInnerCutout }); }, this); }, draw : function(easeDecimal){ var animDecimal = (easeDecimal) ? easeDecimal : 1; this.clear(); helpers.each(this.segments,function(segment,index){ segment.transition({ circumference : this.calculateCircumference(segment.value), outerRadius : this.outerRadius, innerRadius : (this.outerRadius/100) * this.options.percentageInnerCutout },animDecimal); segment.endAngle = segment.startAngle + segment.circumference; segment.draw(); if (index === 0){ segment.startAngle = Math.PI * 1.5; } //Check to see if it's the last segment, if not get the next and update the start angle if (index < this.segments.length-1){ this.segments[index+1].startAngle = segment.endAngle; } },this); } }); Chart.types.Doughnut.extend({ name : "Pie", defaults : helpers.merge(defaultConfig,{percentageInnerCutout : 0}) }); }).call(this); (function(){ "use strict"; var root = this, Chart = root.Chart, helpers = Chart.helpers; var defaultConfig = { ///Boolean - Whether grid lines are shown across the chart scaleShowGridLines : true, //String - Colour of the grid lines scaleGridLineColor : "rgba(0,0,0,.05)", //Number - Width of the grid lines scaleGridLineWidth : 1, //Boolean - Whether the line is curved between points bezierCurve : true, //Number - Tension of the bezier curve between points bezierCurveTension : 0.4, //Boolean - Whether to show a dot for each point pointDot : true, //Number - Radius of each point dot in pixels pointDotRadius : 4, //Number - Pixel width of point dot stroke pointDotStrokeWidth : 1, //Number - amount extra to add to the radius to cater for hit detection outside the drawn point pointHitDetectionRadius : 20, //Boolean - Whether to show a stroke for datasets datasetStroke : true, //Number - Pixel width of dataset stroke datasetStrokeWidth : 2, //Boolean - Whether to fill the dataset with a colour datasetFill : true, //String - A legend template legendTemplate : "

-legend\"><% for (var i=0; i
• \"><%if(datasets[i].label){%><%=datasets[i].label%><%}%>
<%}%>

" }; Chart.Type.extend({ name: "Line", defaults : defaultConfig, initialize: function(data){ //Declare the extension of the default point, to cater for the options passed in to the constructor this.PointClass = Chart.Point.extend({ strokeWidth : this.options.pointDotStrokeWidth, radius : this.options.pointDotRadius, display: this.options.pointDot, hitDetectionRadius : this.options.pointHitDetectionRadius, ctx : this.chart.ctx, inRange : function(mouseX){ return (Math.pow(mouseX-this.x, 2) < Math.pow(this.radius + this.hitDetectionRadius,2)); } }); this.datasets = []; //Set up tooltip events on the chart if (this.options.showTooltips){ helpers.bindEvents(this, this.options.tooltipEvents, function(evt){ var activePoints = (evt.type !== 'mouseout') ? this.getPointsAtEvent(evt) : []; this.eachPoints(function(point){ point.restore(['fillColor', 'strokeColor']); }); helpers.each(activePoints, function(activePoint){ activePoint.fillColor = activePoint.highlightFill; activePoint.strokeColor = activePoint.highlightStroke; }); this.showTooltip(activePoints); }); } //Iterate through each of the datasets, and build this into a property of the chart helpers.each(data.datasets,function(dataset){ var datasetObject = { label : dataset.label || null, fillColor : dataset.fillColor, strokeColor : dataset.strokeColor, pointColor : dataset.pointColor, pointStrokeColor : dataset.pointStrokeColor, points : [] }; this.datasets.push(datasetObject); helpers.each(dataset.data,function(dataPoint,index){ //Add a new point for each piece of data, passing any required data to draw. datasetObject.points.push(new this.PointClass({ value : dataPoint, label : data.labels[index], datasetLabel: dataset.label, strokeColor : dataset.pointStrokeColor, fillColor : dataset.pointColor, highlightFill : dataset.pointHighlightFill || dataset.pointColor, highlightStroke : dataset.pointHighlightStroke || dataset.pointStrokeColor })); },this); this.buildScale(data.labels); this.eachPoints(function(point, index){ helpers.extend(point, { x: this.scale.calculateX(index), y: this.scale.endPoint }); point.save(); }, this); },this); this.render(); }, update : function(){ this.scale.update(); // Reset any highlight colours before updating. helpers.each(this.activeElements, function(activeElement){ activeElement.restore(['fillColor', 'strokeColor']); }); this.eachPoints(function(point){ point.save(); }); this.render(); }, eachPoints : function(callback){ helpers.each(this.datasets,function(dataset){ helpers.each(dataset.points,callback,this); },this); }, getPointsAtEvent : function(e){ var pointsArray = [], eventPosition = helpers.getRelativePosition(e); helpers.each(this.datasets,function(dataset){ helpers.each(dataset.points,function(point){ if (point.inRange(eventPosition.x,eventPosition.y)) pointsArray.push(point); }); },this); return pointsArray; }, buildScale : function(labels){ var self = this; var dataTotal = function(){ var values = []; self.eachPoints(function(point){ values.push(point.value); }); return values; }; var scaleOptions = { templateString : this.options.scaleLabel, height : this.chart.height, width : this.chart.width, ctx : this.chart.ctx, textColor : this.options.scaleFontColor, fontSize : this.options.scaleFontSize, fontStyle : this.options.scaleFontStyle, fontFamily : this.options.scaleFontFamily, valuesCount : labels.length, beginAtZero : this.options.scaleBeginAtZero, integersOnly : this.options.scaleIntegersOnly, calculateYRange : function(currentHeight){ var updatedRanges = helpers.calculateScaleRange( dataTotal(), currentHeight, this.fontSize, this.beginAtZero, this.integersOnly ); helpers.extend(this, updatedRanges); }, xLabels : labels, font : helpers.fontString(this.options.scaleFontSize, this.options.scaleFontStyle, this.options.scaleFontFamily), lineWidth : this.options.scaleLineWidth, lineColor : this.options.scaleLineColor, gridLineWidth : (this.options.scaleShowGridLines) ? this.options.scaleGridLineWidth : 0, gridLineColor : (this.options.scaleShowGridLines) ? this.options.scaleGridLineColor : "rgba(0,0,0,0)", padding: (this.options.showScale) ? 0 : this.options.pointDotRadius + this.options.pointDotStrokeWidth, showLabels : this.options.scaleShowLabels, display : this.options.showScale }; if (this.options.scaleOverride){ helpers.extend(scaleOptions, { calculateYRange: helpers.noop, steps: this.options.scaleSteps, stepValue: this.options.scaleStepWidth, min: this.options.scaleStartValue, max: this.options.scaleStartValue + (this.options.scaleSteps * this.options.scaleStepWidth) }); } this.scale = new Chart.Scale(scaleOptions); }, addData : function(valuesArray,label){ //Map the values array for each of the datasets helpers.each(valuesArray,function(value,datasetIndex){ //Add a new point for each piece of data, passing any required data to draw. this.datasets[datasetIndex].points.push(new this.PointClass({ value : value, label : label, x: this.scale.calculateX(this.scale.valuesCount+1), y: this.scale.endPoint, strokeColor : this.datasets[datasetIndex].pointStrokeColor, fillColor : this.datasets[datasetIndex].pointColor })); },this); this.scale.addXLabel(label); //Then re-render the chart. this.update(); }, removeData : function(){ this.scale.removeXLabel(); //Then re-render the chart. helpers.each(this.datasets,function(dataset){ dataset.points.shift(); },this); this.update(); }, reflow : function(){ var newScaleProps = helpers.extend({ height : this.chart.height, width : this.chart.width }); this.scale.update(newScaleProps); }, draw : function(ease){ var easingDecimal = ease || 1; this.clear(); var ctx = this.chart.ctx; // Some helper methods for getting the next/prev points var hasValue = function(item){ return item.value !== null; }, nextPoint = function(point, collection, index){ return helpers.findNextWhere(collection, hasValue, index) || point; }, previousPoint = function(point, collection, index){ return helpers.findPreviousWhere(collection, hasValue, index) || point; }; this.scale.draw(easingDecimal); helpers.each(this.datasets,function(dataset){ var pointsWithValues = helpers.where(dataset.points, hasValue); //Transition each point first so that the line and point drawing isn't out of sync //We can use this extra loop to calculate the control points of this dataset also in this loop helpers.each(dataset.points, function(point, index){ if (point.hasValue()){ point.transition({ y : this.scale.calculateY(point.value), x : this.scale.calculateX(index) }, easingDecimal); } },this); // Control points need to be calculated in a seperate loop, because we need to know the current x/y of the point // This would cause issues when there is no animation, because the y of the next point would be 0, so beziers would be skewed if (this.options.bezierCurve){ helpers.each(pointsWithValues, function(point, index){ var tension = (index > 0 && index < pointsWithValues.length - 1) ? this.options.bezierCurveTension : 0; point.controlPoints = helpers.splineCurve( previousPoint(point, pointsWithValues, index), point, nextPoint(point, pointsWithValues, index), tension ); // Prevent the bezier going outside of the bounds of the graph // Cap puter bezier handles to the upper/lower scale bounds if (point.controlPoints.outer.y > this.scale.endPoint){ point.controlPoints.outer.y = this.scale.endPoint; } else if (point.controlPoints.outer.y < this.scale.startPoint){ point.controlPoints.outer.y = this.scale.startPoint; } // Cap inner bezier handles to the upper/lower scale bounds if (point.controlPoints.inner.y > this.scale.endPoint){ point.controlPoints.inner.y = this.scale.endPoint; } else if (point.controlPoints.inner.y < this.scale.startPoint){ point.controlPoints.inner.y = this.scale.startPoint; } },this); } //Draw the line between all the points ctx.lineWidth = this.options.datasetStrokeWidth; ctx.strokeStyle = dataset.strokeColor; ctx.beginPath(); helpers.each(pointsWithValues, function(point, index){ if (index === 0){ ctx.moveTo(point.x, point.y); } else{ if(this.options.bezierCurve){ var previous = previousPoint(point, pointsWithValues, index); ctx.bezierCurveTo( previous.controlPoints.outer.x, previous.controlPoints.outer.y, point.controlPoints.inner.x, point.controlPoints.inner.y, point.x, point.y ); } else{ ctx.lineTo(point.x,point.y); } } }, this); ctx.stroke(); if (this.options.datasetFill && pointsWithValues.length > 0){ //Round off the line by going to the base of the chart, back to the start, then fill. ctx.lineTo(pointsWithValues[pointsWithValues.length - 1].x, this.scale.endPoint); ctx.lineTo(pointsWithValues[0].x, this.scale.endPoint); ctx.fillStyle = dataset.fillColor; ctx.closePath(); ctx.fill(); } //Now draw the points over the line //A little inefficient double looping, but better than the line //lagging behind the point positions helpers.each(pointsWithValues,function(point){ point.draw(); }); },this); } }); }).call(this); (function(){ "use strict"; var root = this, Chart = root.Chart, //Cache a local reference to Chart.helpers helpers = Chart.helpers; var defaultConfig = { //Boolean - Show a backdrop to the scale label scaleShowLabelBackdrop : true, //String - The colour of the label backdrop scaleBackdropColor : "rgba(255,255,255,0.75)", // Boolean - Whether the scale should begin at zero scaleBeginAtZero : true, //Number - The backdrop padding above & below the label in pixels scaleBackdropPaddingY : 2, //Number - The backdrop padding to the side of the label in pixels scaleBackdropPaddingX : 2, //Boolean - Show line for each value in the scale scaleShowLine : true, //Boolean - Stroke a line around each segment in the chart segmentShowStroke : true, //String - The colour of the stroke on each segement. segmentStrokeColor : "#fff", //Number - The width of the stroke value in pixels segmentStrokeWidth : 2, //Number - Amount of animation steps animationSteps : 100, //String - Animation easing effect. animationEasing : "easeOutBounce", //Boolean - Whether to animate the rotation of the chart animateRotate : true, //Boolean - Whether to animate scaling the chart from the centre animateScale : false, //String - A legend template legendTemplate : "

-legend\"><% for (var i=0; i
• \"><%if(segments[i].label){%><%=segments[i].label%><%}%>
<%}%>

" }; Chart.Type.extend({ //Passing in a name registers this chart in the Chart namespace name: "PolarArea", //Providing a defaults will also register the deafults in the chart namespace defaults : defaultConfig, //Initialize is fired when the chart is initialized - Data is passed in as a parameter //Config is automatically merged by the core of Chart.js, and is available at this.options initialize: function(data){ this.segments = []; //Declare segment class as a chart instance specific class, so it can share props for this instance this.SegmentArc = Chart.Arc.extend({ showStroke : this.options.segmentShowStroke, strokeWidth : this.options.segmentStrokeWidth, strokeColor : this.options.segmentStrokeColor, ctx : this.chart.ctx, innerRadius : 0, x : this.chart.width/2, y : this.chart.height/2 }); this.scale = new Chart.RadialScale({ display: this.options.showScale, fontStyle: this.options.scaleFontStyle, fontSize: this.options.scaleFontSize, fontFamily: this.options.scaleFontFamily, fontColor: this.options.scaleFontColor, showLabels: this.options.scaleShowLabels, showLabelBackdrop: this.options.scaleShowLabelBackdrop, backdropColor: this.options.scaleBackdropColor, backdropPaddingY : this.options.scaleBackdropPaddingY, backdropPaddingX: this.options.scaleBackdropPaddingX, lineWidth: (this.options.scaleShowLine) ? this.options.scaleLineWidth : 0, lineColor: this.options.scaleLineColor, lineArc: true, width: this.chart.width, height: this.chart.height, xCenter: this.chart.width/2, yCenter: this.chart.height/2, ctx : this.chart.ctx, templateString: this.options.scaleLabel, valuesCount: data.length }); this.updateScaleRange(data); this.scale.update(); helpers.each(data,function(segment,index){ this.addData(segment,index,true); },this); //Set up tooltip events on the chart if (this.options.showTooltips){ helpers.bindEvents(this, this.options.tooltipEvents, function(evt){ var activeSegments = (evt.type !== 'mouseout') ? this.getSegmentsAtEvent(evt) : []; helpers.each(this.segments,function(segment){ segment.restore(["fillColor"]); }); helpers.each(activeSegments,function(activeSegment){ activeSegment.fillColor = activeSegment.highlightColor; }); this.showTooltip(activeSegments); }); } this.render(); }, getSegmentsAtEvent : function(e){ var segmentsArray = []; var location = helpers.getRelativePosition(e); helpers.each(this.segments,function(segment){ if (segment.inRange(location.x,location.y)) segmentsArray.push(segment); },this); return segmentsArray; }, addData : function(segment, atIndex, silent){ var index = atIndex || this.segments.length; this.segments.splice(index, 0, new this.SegmentArc({ fillColor: segment.color, highlightColor: segment.highlight || segment.color, label: segment.label, value: segment.value, outerRadius: (this.options.animateScale) ? 0 : this.scale.calculateCenterOffset(segment.value), circumference: (this.options.animateRotate) ? 0 : this.scale.getCircumference(), startAngle: Math.PI * 1.5 })); if (!silent){ this.reflow(); this.update(); } }, removeData: function(atIndex){ var indexToDelete = (helpers.isNumber(atIndex)) ? atIndex : this.segments.length-1; this.segments.splice(indexToDelete, 1); this.reflow(); this.update(); }, calculateTotal: function(data){ this.total = 0; helpers.each(data,function(segment){ this.total += segment.value; },this); this.scale.valuesCount = this.segments.length; }, updateScaleRange: function(datapoints){ var valuesArray = []; helpers.each(datapoints,function(segment){ valuesArray.push(segment.value); }); var scaleSizes = (this.options.scaleOverride) ? { steps: this.options.scaleSteps, stepValue: this.options.scaleStepWidth, min: this.options.scaleStartValue, max: this.options.scaleStartValue + (this.options.scaleSteps * this.options.scaleStepWidth) } : helpers.calculateScaleRange( valuesArray, helpers.min([this.chart.width, this.chart.height])/2, this.options.scaleFontSize, this.options.scaleBeginAtZero, this.options.scaleIntegersOnly ); helpers.extend( this.scale, scaleSizes, { size: helpers.min([this.chart.width, this.chart.height]), xCenter: this.chart.width/2, yCenter: this.chart.height/2 } ); }, update : function(){ this.calculateTotal(this.segments); helpers.each(this.segments,function(segment){ segment.save(); }); this.render(); }, reflow : function(){ helpers.extend(this.SegmentArc.prototype,{ x : this.chart.width/2, y : this.chart.height/2 }); this.updateScaleRange(this.segments); this.scale.update(); helpers.extend(this.scale,{ xCenter: this.chart.width/2, yCenter: this.chart.height/2 }); helpers.each(this.segments, function(segment){ segment.update({ outerRadius : this.scale.calculateCenterOffset(segment.value) }); }, this); }, draw : function(ease){ var easingDecimal = ease || 1; //Clear & draw the canvas this.clear(); helpers.each(this.segments,function(segment, index){ segment.transition({ circumference : this.scale.getCircumference(), outerRadius : this.scale.calculateCenterOffset(segment.value) },easingDecimal); segment.endAngle = segment.startAngle + segment.circumference; // If we've removed the first segment we need to set the first one to // start at the top. if (index === 0){ segment.startAngle = Math.PI * 1.5; } //Check to see if it's the last segment, if not get the next and update the start angle if (index < this.segments.length - 1){ this.segments[index+1].startAngle = segment.endAngle; } segment.draw(); }, this); this.scale.draw(); } }); }).call(this); (function(){ "use strict"; var root = this, Chart = root.Chart, helpers = Chart.helpers; Chart.Type.extend({ name: "Radar", defaults:{ //Boolean - Whether to show lines for each scale point scaleShowLine : true, //Boolean - Whether we show the angle lines out of the radar angleShowLineOut : true, //Boolean - Whether to show labels on the scale scaleShowLabels : false, // Boolean - Whether the scale should begin at zero scaleBeginAtZero : true, //String - Colour of the angle line angleLineColor : "rgba(0,0,0,.1)", //Number - Pixel width of the angle line angleLineWidth : 1, //String - Point label font declaration pointLabelFontFamily : "'Arial'", //String - Point label font weight pointLabelFontStyle : "normal", //Number - Point label font size in pixels pointLabelFontSize : 10, //String - Point label font colour pointLabelFontColor : "#666", //Boolean - Whether to show a dot for each point pointDot : true, //Number - Radius of each point dot in pixels pointDotRadius : 3, //Number - Pixel width of point dot stroke pointDotStrokeWidth : 1, //Number - amount extra to add to the radius to cater for hit detection outside the drawn point pointHitDetectionRadius : 20, //Boolean - Whether to show a stroke for datasets datasetStroke : true, //Number - Pixel width of dataset stroke datasetStrokeWidth : 2, //Boolean - Whether to fill the dataset with a colour datasetFill : true, //String - A legend template legendTemplate : "

-legend\"><% for (var i=0; i
• \"><%if(datasets[i].label){%><%=datasets[i].label%><%}%>
<%}%>

" }, initialize: function(data){ this.PointClass = Chart.Point.extend({ strokeWidth : this.options.pointDotStrokeWidth, radius : this.options.pointDotRadius, display: this.options.pointDot, hitDetectionRadius : this.options.pointHitDetectionRadius, ctx : this.chart.ctx }); this.datasets = []; this.buildScale(data); //Set up tooltip events on the chart if (this.options.showTooltips){ helpers.bindEvents(this, this.options.tooltipEvents, function(evt){ var activePointsCollection = (evt.type !== 'mouseout') ? this.getPointsAtEvent(evt) : []; this.eachPoints(function(point){ point.restore(['fillColor', 'strokeColor']); }); helpers.each(activePointsCollection, function(activePoint){ activePoint.fillColor = activePoint.highlightFill; activePoint.strokeColor = activePoint.highlightStroke; }); this.showTooltip(activePointsCollection); }); } //Iterate through each of the datasets, and build this into a property of the chart helpers.each(data.datasets,function(dataset){ var datasetObject = { label: dataset.label || null, fillColor : dataset.fillColor, strokeColor : dataset.strokeColor, pointColor : dataset.pointColor, pointStrokeColor : dataset.pointStrokeColor, points : [] }; this.datasets.push(datasetObject); helpers.each(dataset.data,function(dataPoint,index){ //Add a new point for each piece of data, passing any required data to draw. var pointPosition; if (!this.scale.animation){ pointPosition = this.scale.getPointPosition(index, this.scale.calculateCenterOffset(dataPoint)); } datasetObject.points.push(new this.PointClass({ value : dataPoint, label : data.labels[index], datasetLabel: dataset.label, x: (this.options.animation) ? this.scale.xCenter : pointPosition.x, y: (this.options.animation) ? this.scale.yCenter : pointPosition.y, strokeColor : dataset.pointStrokeColor, fillColor : dataset.pointColor, highlightFill : dataset.pointHighlightFill || dataset.pointColor, highlightStroke : dataset.pointHighlightStroke || dataset.pointStrokeColor })); },this); },this); this.render(); }, eachPoints : function(callback){ helpers.each(this.datasets,function(dataset){ helpers.each(dataset.points,callback,this); },this); }, getPointsAtEvent : function(evt){ var mousePosition = helpers.getRelativePosition(evt), fromCenter = helpers.getAngleFromPoint({ x: this.scale.xCenter, y: this.scale.yCenter }, mousePosition); var anglePerIndex = (Math.PI * 2) /this.scale.valuesCount, pointIndex = Math.round((fromCenter.angle - Math.PI * 1.5) / anglePerIndex), activePointsCollection = []; // If we're at the top, make the pointIndex 0 to get the first of the array. if (pointIndex >= this.scale.valuesCount || pointIndex < 0){ pointIndex = 0; } if (fromCenter.distance <= this.scale.drawingArea){ helpers.each(this.datasets, function(dataset){ activePointsCollection.push(dataset.points[pointIndex]); }); } return activePointsCollection; }, buildScale : function(data){ this.scale = new Chart.RadialScale({ display: this.options.showScale, fontStyle: this.options.scaleFontStyle, fontSize: this.options.scaleFontSize, fontFamily: this.options.scaleFontFamily, fontColor: this.options.scaleFontColor, showLabels: this.options.scaleShowLabels, showLabelBackdrop: this.options.scaleShowLabelBackdrop, backdropColor: this.options.scaleBackdropColor, backdropPaddingY : this.options.scaleBackdropPaddingY, backdropPaddingX: this.options.scaleBackdropPaddingX, lineWidth: (this.options.scaleShowLine) ? this.options.scaleLineWidth : 0, lineColor: this.options.scaleLineColor, angleLineColor : this.options.angleLineColor, angleLineWidth : (this.options.angleShowLineOut) ? this.options.angleLineWidth : 0, // Point labels at the edge of each line pointLabelFontColor : this.options.pointLabelFontColor, pointLabelFontSize : this.options.pointLabelFontSize, pointLabelFontFamily : this.options.pointLabelFontFamily, pointLabelFontStyle : this.options.pointLabelFontStyle, height : this.chart.height, width: this.chart.width, xCenter: this.chart.width/2, yCenter: this.chart.height/2, ctx : this.chart.ctx, templateString: this.options.scaleLabel, labels: data.labels, valuesCount: data.datasets[0].data.length }); this.scale.setScaleSize(); this.updateScaleRange(data.datasets); this.scale.buildYLabels(); }, updateScaleRange: function(datasets){ var valuesArray = (function(){ var totalDataArray = []; helpers.each(datasets,function(dataset){ if (dataset.data){ totalDataArray = totalDataArray.concat(dataset.data); } else { helpers.each(dataset.points, function(point){ totalDataArray.push(point.value); }); } }); return totalDataArray; })(); var scaleSizes = (this.options.scaleOverride) ? { steps: this.options.scaleSteps, stepValue: this.options.scaleStepWidth, min: this.options.scaleStartValue, max: this.options.scaleStartValue + (this.options.scaleSteps * this.options.scaleStepWidth) } : helpers.calculateScaleRange( valuesArray, helpers.min([this.chart.width, this.chart.height])/2, this.options.scaleFontSize, this.options.scaleBeginAtZero, this.options.scaleIntegersOnly ); helpers.extend( this.scale, scaleSizes ); }, addData : function(valuesArray,label){ //Map the values array for each of the datasets this.scale.valuesCount++; helpers.each(valuesArray,function(value,datasetIndex){ var pointPosition = this.scale.getPointPosition(this.scale.valuesCount, this.scale.calculateCenterOffset(value)); this.datasets[datasetIndex].points.push(new this.PointClass({ value : value, label : label, x: pointPosition.x, y: pointPosition.y, strokeColor : this.datasets[datasetIndex].pointStrokeColor, fillColor : this.datasets[datasetIndex].pointColor })); },this); this.scale.labels.push(label); this.reflow(); this.update(); }, removeData : function(){ this.scale.valuesCount--; this.scale.labels.shift(); helpers.each(this.datasets,function(dataset){ dataset.points.shift(); },this); this.reflow(); this.update(); }, update : function(){ this.eachPoints(function(point){ point.save(); }); this.reflow(); this.render(); }, reflow: function(){ helpers.extend(this.scale, { width : this.chart.width, height: this.chart.height, size : helpers.min([this.chart.width, this.chart.height]), xCenter: this.chart.width/2, yCenter: this.chart.height/2 }); this.updateScaleRange(this.datasets); this.scale.setScaleSize(); this.scale.buildYLabels(); }, draw : function(ease){ var easeDecimal = ease || 1, ctx = this.chart.ctx; this.clear(); this.scale.draw(); helpers.each(this.datasets,function(dataset){ //Transition each point first so that the line and point drawing isn't out of sync helpers.each(dataset.points,function(point,index){ if (point.hasValue()){ point.transition(this.scale.getPointPosition(index, this.scale.calculateCenterOffset(point.value)), easeDecimal); } },this); //Draw the line between all the points ctx.lineWidth = this.options.datasetStrokeWidth; ctx.strokeStyle = dataset.strokeColor; ctx.beginPath(); helpers.each(dataset.points,function(point,index){ if (index === 0){ ctx.moveTo(point.x,point.y); } else{ ctx.lineTo(point.x,point.y); } },this); ctx.closePath(); ctx.stroke(); ctx.fillStyle = dataset.fillColor; ctx.fill(); //Now draw the points over the line //A little inefficient double looping, but better than the line //lagging behind the point positions helpers.each(dataset.points,function(point){ if (point.hasValue()){ point.draw(); } }); },this); } }); }).call(this);