chart.js /*! * Chart.js * http://chartjs.org/ * Version: 1.0.1-beta.4 * * Copyright 2014 Nick Downie * Released under the MIT license * https://github.com/nnnick/Chart.js/blob/master/LICENSE.md */(function(){"use strict";//Declare root vari
/*!
* Chart.js
* http://chartjs.org/
* Version: 1.0.1-beta.4
*
* Copyright 2014 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 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
//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 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 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 (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
//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;
// 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: 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
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);