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/*!
* Chart.js
* http://chartjs.org/
* Version: {{ version }}
*
* Copyright 2015 Nick Downie
* Released under the MIT license
* https://github.com/nnnick/Chart.js/blob/master/LICENSE.md
*/
(function(){
"use strict";
//Declare root variable - window in the browser, global on the server
var root = this,
previous = root.Chart;
//Occupy the global variable of Chart, and create a simple base class
var Chart = function(context){
var chart = this;
this.canvas = context.canvas;
this.ctx = context;
//Variables global to the chart
var computeDimension = function(element,dimension)
{
if (element['offset'+dimension])
{
return element['offset'+dimension];
}
else
{
return document.defaultView.getComputedStyle(element).getPropertyValue(dimension);
}
}
var width = this.width = computeDimension(context.canvas,'Width');
var height = this.height = computeDimension(context.canvas,'Height');
// Firefox requires this to work correctly
context.canvas.width = width;
context.canvas.height = height;
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,
// Boolean - Determines whether to draw built-in tooltip or call custom tooltip function
customTooltips: false,
// Array - Array of string names to attach tooltip events
tooltipEvents: ["mousemove", "touchstart", "touchmove", "mouseout"],
// String - Tooltip background colour
tooltipFillColor: "rgba(0,0,0,0.8)",
// String - Tooltip label font declaration for the scale label
tooltipFontFamily: "'Helvetica Neue', 'Helvetica', 'Arial', sans-serif",
// Number - Tooltip label font size in pixels
tooltipFontSize: 14,
// String - Tooltip font weight style
tooltipFontStyle: "normal",
// String - Tooltip label font colour
tooltipFontColor: "#fff",
// String - Tooltip title font declaration for the scale label
tooltipTitleFontFamily: "'Helvetica Neue', 'Helvetica', 'Arial', sans-serif",
// Number - Tooltip title font size in pixels
tooltipTitleFontSize: 14,
// String - Tooltip title font weight style
tooltipTitleFontStyle: "bold",
// String - Tooltip title font colour
tooltipTitleFontColor: "#fff",
// Number - pixel width of padding around tooltip text
tooltipYPadding: 6,
// Number - pixel width of padding around tooltip text
tooltipXPadding: 6,
// Number - Size of the caret on the tooltip
tooltipCaretSize: 8,
// Number - Pixel radius of the tooltip border
tooltipCornerRadius: 6,
// Number - Pixel offset from point x to tooltip edge
tooltipXOffset: 10,
// String - Template string for single tooltips
tooltipTemplate: "<%if (label){%><%=label%>: <%}%><%= value %>",
// String - Template string for single tooltips
multiTooltipTemplate: "<%= value %>",
// String - Colour behind the legend colour block
multiTooltipKeyBackground: '#fff',
// Function - Will fire on animation progression.
onAnimationProgress: function(){},
// Function - Will fire on animation completion.
onAnimationComplete: function(){}
}
};
//Create a dictionary of chart types, to allow for extension of existing types
Chart.types = {};
//Global Chart helpers object for utility methods and classes
var helpers = Chart.helpers = {};
//-- Basic js utility methods
var each = helpers.each = function(loopable,callback,self){
var additionalArgs = Array.prototype.slice.call(arguments, 3);
// Check to see if null or undefined firstly.
if (loopable){
if (loopable.length === +loopable.length){
var i;
for (i=0; i<loopable.length; i++){
callback.apply(self,[loopable[i], i].concat(additionalArgs));
}
}
else{
for (var item in loopable){
callback.apply(self,[loopable[item],item].concat(additionalArgs));
}
}
}
},
clone = helpers.clone = function(obj){
var objClone = {};
each(obj,function(value,key){
if (obj.hasOwnProperty(key)) objClone[key] = value;
});
return objClone;
},
extend = helpers.extend = function(base){
each(Array.prototype.slice.call(arguments,1), function(extensionObject) {
each(extensionObject,function(value,key){
if (extensionObject.hasOwnProperty(key)) base[key] = value;
});
});
return base;
},
merge = helpers.merge = function(base,master){
//Merge properties in left object over to a shallow clone of object right.
var args = Array.prototype.slice.call(arguments,0);
args.unshift({});
return extend.apply(null, args);
},
indexOf = helpers.indexOf = function(arrayToSearch, item){
if (Array.prototype.indexOf) {
return arrayToSearch.indexOf(item);
}
else{
for (var i = 0; i < arrayToSearch.length; i++) {
if (arrayToSearch[i] === item) return i;
}
return -1;
}
},
where = helpers.where = function(collection, filterCallback){
var filtered = [];
helpers.each(collection, function(item){
if (filterCallback(item)){
filtered.push(item);
}
});
return filtered;
},
findNextWhere = helpers.findNextWhere = function(arrayToSearch, filterCallback, startIndex){
// Default to start of the array
if (!startIndex){
startIndex = -1;
}
for (var i = startIndex + 1; i < arrayToSearch.length; i++) {
var currentItem = arrayToSearch[i];
if (filterCallback(currentItem)){
return currentItem;
}
}
},
findPreviousWhere = helpers.findPreviousWhere = function(arrayToSearch, filterCallback, startIndex){
// Default to end of the array
if (!startIndex){
startIndex = arrayToSearch.length;
}
for (var i = startIndex - 1; i >= 0; i--) {
var currentItem = arrayToSearch[i];
if (filterCallback(currentItem)){
return currentItem;
}
}
},
inherits = helpers.inherits = function(extensions){
//Basic javascript inheritance based on the model created in Backbone.js
var parent = this;
var ChartElement = (extensions && extensions.hasOwnProperty("constructor")) ? extensions.constructor : function(){ return parent.apply(this, arguments); };
var Surrogate = function(){ this.constructor = ChartElement;};
Surrogate.prototype = parent.prototype;
ChartElement.prototype = new Surrogate();
ChartElement.extend = inherits;
if (extensions) extend(ChartElement.prototype, extensions);
ChartElement.__super__ = parent.prototype;
return ChartElement;
},
noop = helpers.noop = function(){},
uid = helpers.uid = (function(){
var id=0;
return function(){
return "chart-" + id++;
};
})(),
warn = helpers.warn = function(str){
//Method for warning of errors
if (window.console && typeof window.console.warn == "function") console.warn(str);
},
amd = helpers.amd = (typeof define == 'function' && define.amd),
//-- Math methods
isNumber = helpers.isNumber = function(n){
return !isNaN(parseFloat(n)) && isFinite(n);
},
max = helpers.max = function(array){
return Math.max.apply( Math, array );
},
min = helpers.min = function(array){
return Math.min.apply( Math, array );
},
cap = helpers.cap = function(valueToCap,maxValue,minValue){
if(isNumber(maxValue)) {
if( valueToCap > maxValue ) {
return maxValue;
}
}
else if(isNumber(minValue)){
if ( valueToCap < minValue ){
return minValue;
}
}
return valueToCap;
},
getDecimalPlaces = helpers.getDecimalPlaces = function(num){
if (num%1!==0 && isNumber(num)){
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
cancelAnimFrame(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);
var canvas = this.chart.canvas;
// Reset canvas height/width attributes starts a fresh with the canvas context
canvas.width = this.chart.width;
canvas.height = this.chart.height;
// < IE9 doesn't support removeProperty
if (canvas.style.removeProperty) {
canvas.style.removeProperty('width');
canvas.style.removeProperty('height');
} else {
canvas.style.removeAttribute('width');
canvas.style.removeAttribute('height');
}
delete Chart.instances[this.id];
},
showTooltip : function(ChartElements, forceRedraw){
// Only redraw the chart if we've actually changed what we're hovering on.
if (typeof this.activeElements === 'undefined') this.activeElements = [];
var isChanged = (function(Elements){
var changed = false;
if (Elements.length !== this.activeElements.length){
changed = true;
return changed;
}
each(Elements, function(element, index){
if (element !== this.activeElements[index]){
changed = true;
}
}, this);
return changed;
}).call(this, ChartElements);
if (!isChanged && !forceRedraw){
return;
}
else{
this.activeElements = ChartElements;
}
this.draw();
if(this.options.customTooltips){
this.options.customTooltips(false);
}
if (ChartElements.length > 0){
// If we have multiple datasets, show a MultiTooltip for all of the data points at that index
if (this.datasets && this.datasets.length > 1) {
var dataArray,
dataIndex;
for (var i = this.datasets.length - 1; i >= 0; i--) {
dataArray = this.datasets[i].points || this.datasets[i].bars || this.datasets[i].segments;
dataIndex = indexOf(dataArray, ChartElements[0]);
if (dataIndex !== -1){
break;
}
}
var tooltipLabels = [],
tooltipColors = [],
medianPosition = (function(index) {
// Get all the points at that particular index
var Elements = [],
dataCollection,
xPositions = [],
yPositions = [],
xMax,
yMax,
xMin,
yMin;
helpers.each(this.datasets, function(dataset){
dataCollection = dataset.points || dataset.bars || dataset.segments;
if (dataCollection[dataIndex] && dataCollection[dataIndex].hasValue()){
Elements.push(dataCollection[dataIndex]);
}
});
helpers.each(Elements, function(element) {
xPositions.push(element.x);
yPositions.push(element.y);
//Include any colour information about the element
tooltipLabels.push(helpers.template(this.options.multiTooltipTemplate, element));
tooltipColors.push({
fill: element._saved.fillColor || element.fillColor,
stroke: element._saved.strokeColor || element.strokeColor
});
}, this);
yMin = min(yPositions);
yMax = max(yPositions);
xMin = min(xPositions);
xMax = max(xPositions);
return {
x: (xMin > this.chart.width/2) ? xMin : xMax,
y: (yMin + yMax)/2
};
}).call(this, dataIndex);
new Chart.MultiTooltip({
x: medianPosition.x,
y: medianPosition.y,
xPadding: this.options.tooltipXPadding,
yPadding: this.options.tooltipYPadding,
xOffset: this.options.tooltipXOffset,
fillColor: this.options.tooltipFillColor,
textColor: this.options.tooltipFontColor,
fontFamily: this.options.tooltipFontFamily,
fontStyle: this.options.tooltipFontStyle,
fontSize: this.options.tooltipFontSize,
titleTextColor: this.options.tooltipTitleFontColor,
titleFontFamily: this.options.tooltipTitleFontFamily,
titleFontStyle: this.options.tooltipTitleFontStyle,
titleFontSize: this.options.tooltipTitleFontSize,
cornerRadius: this.options.tooltipCornerRadius,
labels: tooltipLabels,
legendColors: tooltipColors,
legendColorBackground : this.options.multiTooltipKeyBackground,
title: ChartElements[0].label,
chart: this.chart,
ctx: this.chart.ctx,
custom: this.options.customTooltips
}).draw();
} else {
each(ChartElements, function(Element) {
var tooltipPosition = Element.tooltipPosition();
new Chart.Tooltip({
x: Math.round(tooltipPosition.x),
y: Math.round(tooltipPosition.y),
xPadding: this.options.tooltipXPadding,
yPadding: this.options.tooltipYPadding,
fillColor: this.options.tooltipFillColor,
textColor: this.options.tooltipFontColor,
fontFamily: this.options.tooltipFontFamily,
fontStyle: this.options.tooltipFontStyle,
fontSize: this.options.tooltipFontSize,
caretHeight: this.options.tooltipCaretSize,
cornerRadius: this.options.tooltipCornerRadius,
text: template(this.options.tooltipTemplate, Element),
chart: this.chart,
custom: this.options.customTooltips
}).draw();
}, this);
}
}
return this;
},
toBase64Image : function(){
return this.chart.canvas.toDataURL.apply(this.chart.canvas, arguments);
}
});
Chart.Type.extend = function(extensions){
var parent = this;
var ChartType = function(){
return parent.apply(this,arguments);
};
//Copy the prototype object of the this class
ChartType.prototype = clone(parent.prototype);
//Now overwrite some of the properties in the base class with the new extensions
extend(ChartType.prototype, extensions);
ChartType.extend = Chart.Type.extend;
if (extensions.name || parent.prototype.name){
var chartName = extensions.name || parent.prototype.name;
//Assign any potential default values of the new chart type
//If none are defined, we'll use a clone of the chart type this is being extended from.
//I.e. if we extend a line chart, we'll use the defaults from the line chart if our new chart
//doesn't define some defaults of their own.
var baseDefaults = (Chart.defaults[parent.prototype.name]) ? clone(Chart.defaults[parent.prototype.name]) : {};
Chart.defaults[chartName] = extend(baseDefaults,extensions.defaults);
Chart.types[chartName] = ChartType;
//Register this new chart type in the Chart prototype
Chart.prototype[chartName] = function(data,options){
var config = merge(Chart.defaults.global, Chart.defaults[chartName], options || {});
return new ChartType(data,config,this);
};
} else{
warn("Name not provided for this chart, so it hasn't been registered");
}
return parent;
};
Chart.Element = function(configuration){
extend(this,configuration);
this.initialize.apply(this,arguments);
this.save();
};
extend(Chart.Element.prototype,{
initialize : function(){},
restore : function(props){
if (!props){
extend(this,this._saved);
} else {
each(props,function(key){
this[key] = this._saved[key];
},this);
}
return this;
},
save : function(){
this._saved = clone(this);
delete this._saved._saved;
return this;
},
update : function(newProps){
each(newProps,function(value,key){
this._saved[key] = this[key];
this[key] = value;
},this);
return this;
},
transition : function(props,ease){
each(props,function(value,key){
this[key] = ((value - this._saved[key]) * ease) + this._saved[key];
},this);
return this;
},
tooltipPosition : function(){
return {
x : this.x,
y : this.y
};
},
hasValue: function(){
return isNumber(this.value);
}
});
Chart.Element.extend = inherits;
Chart.Point = Chart.Element.extend({
display: true,
inRange: function(chartX,chartY){
var hitDetectionRange = this.hitDetectionRadius + this.radius;
return ((Math.pow(chartX-this.x, 2)+Math.pow(chartY-this.y, 2)) < Math.pow(hitDetectionRange,2));
},
draw : function(){
if (this.display){
var ctx = this.ctx;
ctx.beginPath();
ctx.arc(this.x, this.y, this.radius, 0, Math.PI*2);
ctx.closePath();
ctx.strokeStyle = this.strokeColor;
ctx.lineWidth = this.strokeWidth;
ctx.fillStyle = this.fillColor;
ctx.fill();
ctx.stroke();
}
//Quick debug for bezier curve splining
//Highlights control points and the line between them.
//Handy for dev - stripped in the min version.
// ctx.save();
// ctx.fillStyle = "black";
// ctx.strokeStyle = "black"
// ctx.beginPath();
// ctx.arc(this.controlPoints.inner.x,this.controlPoints.inner.y, 2, 0, Math.PI*2);
// ctx.fill();
// ctx.beginPath();
// ctx.arc(this.controlPoints.outer.x,this.controlPoints.outer.y, 2, 0, Math.PI*2);
// ctx.fill();
// ctx.moveTo(this.controlPoints.inner.x,this.controlPoints.inner.y);
// ctx.lineTo(this.x, this.y);
// ctx.lineTo(this.controlPoints.outer.x,this.controlPoints.outer.y);
// ctx.stroke();
// ctx.restore();
}
});
Chart.Arc = Chart.Element.extend({
inRange : function(chartX,chartY){
var pointRelativePosition = helpers.getAngleFromPoint(this, {
x: chartX,
y: chartY
});
//Check if within the range of the open/close angle
var betweenAngles = (pointRelativePosition.angle >= this.startAngle && pointRelativePosition.angle <= this.endAngle),
withinRadius = (pointRelativePosition.distance >= this.innerRadius && pointRelativePosition.distance <= this.outerRadius);
return (betweenAngles && withinRadius);
//Ensure within the outside of the arc centre, but inside arc outer
},
tooltipPosition : function(){
var centreAngle = this.startAngle + ((this.endAngle - this.startAngle) / 2),
rangeFromCentre = (this.outerRadius - this.innerRadius) / 2 + this.innerRadius;
return {
x : this.x + (Math.cos(centreAngle) * rangeFromCentre),
y : this.y + (Math.sin(centreAngle) * rangeFromCentre)
};
},
draw : function(animationPercent){
var easingDecimal = animationPercent || 1;
var ctx = this.ctx;
ctx.beginPath();
ctx.arc(this.x, this.y, this.outerRadius, this.startAngle, this.endAngle);
ctx.arc(this.x, this.y, this.innerRadius, this.endAngle, this.startAngle, true);
ctx.closePath();
ctx.strokeStyle = this.strokeColor;
ctx.lineWidth = this.strokeWidth;
ctx.fillStyle = this.fillColor;
ctx.fill();
ctx.lineJoin = 'bevel';
if (this.showStroke){
ctx.stroke();
}
}
});
Chart.Rectangle = Chart.Element.extend({
draw : function(){
var ctx = this.ctx,
halfWidth = this.width/2,
leftX = this.x - halfWidth,
rightX = this.x + halfWidth,
top = this.base - (this.base - this.y),
halfStroke = this.strokeWidth / 2;
// Canvas doesn't allow us to stroke inside the width so we can
// adjust the sizes to fit if we're setting a stroke on the line
if (this.showStroke){
leftX += halfStroke;
rightX -= halfStroke;
top += halfStroke;
}
ctx.beginPath();
ctx.fillStyle = this.fillColor;
ctx.strokeStyle = this.strokeColor;
ctx.lineWidth = this.strokeWidth;
// It'd be nice to keep this class totally generic to any rectangle
// and simply specify which border to miss out.
ctx.moveTo(leftX, this.base);
ctx.lineTo(leftX, top);
ctx.lineTo(rightX, top);
ctx.lineTo(rightX, this.base);
ctx.fill();
if (this.showStroke){
ctx.stroke();
}
},
height : function(){
return this.base - this.y;
},
inRange : function(chartX,chartY){
return (chartX >= this.x - this.width/2 && chartX <= this.x + this.width/2) && (chartY >= this.y && chartY <= this.base);
}
});
Chart.Tooltip = Chart.Element.extend({
draw : function(){
var ctx = this.chart.ctx;
ctx.font = fontString(this.fontSize,this.fontStyle,this.fontFamily);
this.xAlign = "center";
this.yAlign = "above";
//Distance between the actual element.y position and the start of the tooltip caret
var caretPadding = this.caretPadding = 2;
var tooltipWidth = ctx.measureText(this.text).width + 2*this.xPadding,
tooltipRectHeight = this.fontSize + 2*this.yPadding,
tooltipHeight = tooltipRectHeight + this.caretHeight + caretPadding;
if (this.x + tooltipWidth/2 >this.chart.width){
this.xAlign = "left";
} else if (this.x - tooltipWidth/2 < 0){
this.xAlign = "right";
}
if (this.y - tooltipHeight < 0){
this.yAlign = "below";
}
var tooltipX = this.x - tooltipWidth/2,
tooltipY = this.y - tooltipHeight;
ctx.fillStyle = this.fillColor;
// Custom Tooltips
if(this.custom){
this.custom(this);
}
else{
switch(this.yAlign)
{
case "above":
//Draw a caret above the x/y
ctx.beginPath();
ctx.moveTo(this.x,this.y - caretPadding);
ctx.lineTo(this.x + this.caretHeight, this.y - (caretPadding + this.caretHeight));
ctx.lineTo(this.x - this.caretHeight, this.y - (caretPadding + this.caretHeight));
ctx.closePath();
ctx.fill();
break;
case "below":
tooltipY = this.y + caretPadding + this.caretHeight;
//Draw a caret below the x/y
ctx.beginPath();
ctx.moveTo(this.x, this.y + caretPadding);
ctx.lineTo(this.x + this.caretHeight, this.y + caretPadding + this.caretHeight);
ctx.lineTo(this.x - this.caretHeight, this.y + caretPadding + this.caretHeight);
ctx.closePath();
ctx.fill();
break;
}
switch(this.xAlign)
{
case "left":
tooltipX = this.x - tooltipWidth + (this.cornerRadius + this.caretHeight);
break;
case "right":
tooltipX = this.x - (this.cornerRadius + this.caretHeight);
break;
}
drawRoundedRectangle(ctx,tooltipX,tooltipY,tooltipWidth,tooltipRectHeight,this.cornerRadius);
ctx.fill();
ctx.fillStyle = this.textColor;
ctx.textAlign = "center";
ctx.textBaseline = "middle";
ctx.fillText(this.text, tooltipX + tooltipWidth/2, tooltipY + tooltipRectHeight/2);
}
}
});
Chart.MultiTooltip = Chart.Element.extend({
initialize : function(){
this.font = fontString(this.fontSize,this.fontStyle,this.fontFamily);
this.titleFont = fontString(this.titleFontSize,this.titleFontStyle,this.titleFontFamily);
this.height = (this.labels.length * this.fontSize) + ((this.labels.length-1) * (this.fontSize/2)) + (this.yPadding*2) + this.titleFontSize *1.5;
this.ctx.font = this.titleFont;
var titleWidth = this.ctx.measureText(this.title).width,
//Label has a legend square as well so account for this.
labelWidth = longestText(this.ctx,this.font,this.labels) + this.fontSize + 3,
longestTextWidth = max([labelWidth,titleWidth]);
this.width = longestTextWidth + (this.xPadding*2);
var halfHeight = this.height/2;
//Check to ensure the height will fit on the canvas
if (this.y - halfHeight < 0 ){
this.y = halfHeight;
} else if (this.y + halfHeight > this.chart.height){
this.y = this.chart.height - halfHeight;
}
//Decide whether to align left or right based on position on canvas
if (this.x > this.chart.width/2){
this.x -= this.xOffset + this.width;
} else {
this.x += this.xOffset;
}
},
getLineHeight : function(index){
var baseLineHeight = this.y - (this.height/2) + this.yPadding,
afterTitleIndex = index-1;
//If the index is zero, we're getting the title
if (index === 0){
return baseLineHeight + this.titleFontSize/2;
} else{
return baseLineHeight + ((this.fontSize*1.5*afterTitleIndex) + this.fontSize/2) + this.titleFontSize * 1.5;
}
},
draw : function(){
// Custom Tooltips
if(this.custom){
this.custom(this);
}
else{
drawRoundedRectangle(this.ctx,this.x,this.y - this.height/2,this.width,this.height,this.cornerRadius);
var ctx = this.ctx;
ctx.fillStyle = this.fillColor;
ctx.fill();
ctx.closePath();
ctx.textAlign = "left";
ctx.textBaseline = "middle";
ctx.fillStyle = this.titleTextColor;
ctx.font = this.titleFont;
ctx.fillText(this.title,this.x + this.xPadding, this.getLineHeight(0));
ctx.font = this.font;
helpers.each(this.labels,function(label,index){
ctx.fillStyle = this.textColor;
ctx.fillText(label,this.x + this.xPadding + this.fontSize + 3, this.getLineHeight(index + 1));
//A bit gnarly, but clearing this rectangle breaks when using explorercanvas (clears whole canvas)
//ctx.clearRect(this.x + this.xPadding, this.getLineHeight(index + 1) - this.fontSize/2, this.fontSize, this.fontSize);
//Instead we'll make a white filled block to put the legendColour palette over.
ctx.fillStyle = this.legendColorBackground;
ctx.fillRect(this.x + this.xPadding, this.getLineHeight(index + 1) - this.fontSize/2, this.fontSize, this.fontSize);
ctx.fillStyle = this.legendColors[index].fill;
ctx.fillRect(this.x + this.xPadding, this.getLineHeight(index + 1) - this.fontSize/2, this.fontSize, this.fontSize);
},this);
}
}
});
Chart.Scale = Chart.Element.extend({
initialize : function(){
this.fit();
},
buildYLabels : function(){
this.yLabels = [];
var stepDecimalPlaces = getDecimalPlaces(this.stepValue);
for (var i=0; i<=this.steps; i++){
this.yLabels.push(template(this.templateString,{value:(this.min + (i * this.stepValue)).toFixed(stepDecimalPlaces)}));
}
this.yLabelWidth = (this.display && this.showLabels) ? longestText(this.ctx,this.font,this.yLabels) : 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/Math.max((this.valuesCount - ((this.offsetGridLines) ? 0 : 1)), 1),
valueOffset = (valueWidth * index) + this.xScalePaddingLeft;
if (this.offsetGridLines){
valueOffset += (valueWidth/2);
}
return Math.round(valueOffset);
},
update : function(newProps){
helpers.extend(this, newProps);
this.fit();
},
draw : function(){
var ctx = this.ctx,
yLabelGap = (this.endPoint - this.startPoint) / this.steps,
xStart = Math.round(this.xScalePaddingLeft);
if (this.display){
ctx.fillStyle = this.textColor;
ctx.font = this.font;
each(this.yLabels,function(labelString,index){
var yLabelCenter = this.endPoint - (yLabelGap * index),
linePositionY = Math.round(yLabelCenter),
drawHorizontalLine = this.showHorizontalLines;
ctx.textAlign = "right";
ctx.textBaseline = "middle";
if (this.showLabels){
ctx.fillText(labelString,xStart - 10,yLabelCenter);
}
// This is X axis, so draw it
if (index === 0 && !drawHorizontalLine){
drawHorizontalLine = true;
}
if (drawHorizontalLine){
ctx.beginPath();
}
if (index > 0){
// This is a grid line in the centre, so drop that
ctx.lineWidth = this.gridLineWidth;
ctx.strokeStyle = this.gridLineColor;
} else {
// This is the first line on the scale
ctx.lineWidth = this.lineWidth;
ctx.strokeStyle = this.lineColor;
}
linePositionY += helpers.aliasPixel(ctx.lineWidth);
if(drawHorizontalLine){
ctx.moveTo(xStart, linePositionY);
ctx.lineTo(this.width, linePositionY);
ctx.stroke();
ctx.closePath();
}
ctx.lineWidth = this.lineWidth;
ctx.strokeStyle = this.lineColor;
ctx.beginPath();
ctx.moveTo(xStart - 5, linePositionY);
ctx.lineTo(xStart, linePositionY);
ctx.stroke();
ctx.closePath();
},this);
each(this.xLabels,function(label,index){
var xPos = this.calculateX(index) + aliasPixel(this.lineWidth),
// Check to see if line/bar here and decide where to place the line
linePos = this.calculateX(index - (this.offsetGridLines ? 0.5 : 0)) + aliasPixel(this.lineWidth),
isRotated = (this.xLabelRotation > 0),
drawVerticalLine = this.showVerticalLines;
// This is Y axis, so draw it
if (index === 0 && !drawVerticalLine){
drawVerticalLine = true;
}
if (drawVerticalLine){
ctx.beginPath();
}
if (index > 0){
// This is a grid line in the centre, so drop that
ctx.lineWidth = this.gridLineWidth;
ctx.strokeStyle = this.gridLineColor;
} else {
// This is the first line on the scale
ctx.lineWidth = this.lineWidth;
ctx.strokeStyle = this.lineColor;
}
if (drawVerticalLine){
ctx.moveTo(linePos,this.endPoint);
ctx.lineTo(linePos,this.startPoint - 3);
ctx.stroke();
ctx.closePath();
}
ctx.lineWidth = this.lineWidth;
ctx.strokeStyle = this.lineColor;
// Small lines at the bottom of the base grid line
ctx.beginPath();
ctx.moveTo(linePos,this.endPoint);
ctx.lineTo(linePos,this.endPoint + 5);
ctx.stroke();
ctx.closePath();
ctx.save();
ctx.translate(xPos,(isRotated) ? this.endPoint + 12 : this.endPoint + 8);
ctx.rotate(toRadians(this.xLabelRotation)*-1);
ctx.font = this.font;
ctx.textAlign = (isRotated) ? "right" : "center";
ctx.textBaseline = (isRotated) ? "middle" : "top";
ctx.fillText(label, 0, 0);
ctx.restore();
},this);
}
}
});
Chart.RadialScale = Chart.Element.extend({
initialize: function(){
this.size = min([this.height, this.width]);
this.drawingArea = (this.display) ? (this.size/2) - (this.fontSize/2 + this.backdropPaddingY) : (this.size/2);
},
calculateCenterOffset: function(value){
// Take into account half font size + the yPadding of the top value
var scalingFactor = this.drawingArea / (this.max - this.min);
return (value - this.min) * scalingFactor;
},
update : function(){
if (!this.lineArc){
this.setScaleSize();
} else {
this.drawingArea = (this.display) ? (this.size/2) - (this.fontSize/2 + this.backdropPaddingY) : (this.size/2);
}
this.buildYLabels();
},
buildYLabels: function(){
this.yLabels = [];
var stepDecimalPlaces = getDecimalPlaces(this.stepValue);
for (var i=0; i<=this.steps; i++){
this.yLabels.push(template(this.templateString,{value:(this.min + (i * this.stepValue)).toFixed(stepDecimalPlaces)}));
}
},
getCircumference : function(){
return ((Math.PI*2) / this.valuesCount);
},
setScaleSize: function(){
/*
* Right, this is really confusing and there is a lot of maths going on here
* The gist of the problem is here: https://gist.github.com/nnnick/696cc9c55f4b0beb8fe9
*
* Reaction: https://dl.dropboxusercontent.com/u/34601363/toomuchscience.gif
*
* Solution:
*
* We assume the radius of the polygon is half the size of the canvas at first
* at each index we check if the text overlaps.
*
* Where it does, we store that angle and that index.
*
* After finding the largest index and angle we calculate how much we need to remove
* from the shape radius to move the point inwards by that x.
*
* We average the left and right distances to get the maximum shape radius that can fit in the box
* along with labels.
*
* Once we have that, we can find the centre point for the chart, by taking the x text protrusion
* on each side, removing that from the size, halving it and adding the left x protrusion width.
*
* This will mean we have a shape fitted to the canvas, as large as it can be with the labels
* and position it in the most space efficient manner
*
* https://dl.dropboxusercontent.com/u/34601363/yeahscience.gif
*/
// Get maximum radius of the polygon. Either half the height (minus the text width) or half the width.
// Use this to calculate the offset + change. - Make sure L/R protrusion is at least 0 to stop issues with centre points
var largestPossibleRadius = min([(this.height/2 - this.pointLabelFontSize - 5), this.width/2]),
pointPosition,
i,
textWidth,
halfTextWidth,
furthestRight = this.width,
furthestRightIndex,
furthestRightAngle,
furthestLeft = 0,
furthestLeftIndex,
furthestLeftAngle,
xProtrusionLeft,
xProtrusionRight,
radiusReductionRight,
radiusReductionLeft,
maxWidthRadius;
this.ctx.font = fontString(this.pointLabelFontSize,this.pointLabelFontStyle,this.pointLabelFontFamily);
for (i=0;i<this.valuesCount;i++){
// 5px to space the text slightly out - similar to what we do in the draw function.
pointPosition = this.getPointPosition(i, largestPossibleRadius);
textWidth = this.ctx.measureText(template(this.templateString, { value: this.labels[i] })).width + 5;
if (i === 0 || i === this.valuesCount/2){
// If we're at index zero, or exactly the middle, we're at exactly the top/bottom
// of the radar chart, so text will be aligned centrally, so we'll half it and compare
// w/left and right text sizes
halfTextWidth = textWidth/2;
if (pointPosition.x + halfTextWidth > furthestRight) {
furthestRight = pointPosition.x + halfTextWidth;
furthestRightIndex = i;
}
if (pointPosition.x - halfTextWidth < furthestLeft) {
furthestLeft = pointPosition.x - halfTextWidth;
furthestLeftIndex = i;
}
}
else if (i < this.valuesCount/2) {
// Less than half the values means we'll left align the text
if (pointPosition.x + textWidth > furthestRight) {
furthestRight = pointPosition.x + textWidth;
furthestRightIndex = i;
}
}
else if (i > this.valuesCount/2){
// More than half the values means we'll right align the text
if (pointPosition.x - textWidth < furthestLeft) {
furthestLeft = pointPosition.x - textWidth;
furthestLeftIndex = i;
}
}
}
xProtrusionLeft = furthestLeft;
xProtrusionRight = Math.ceil(furthestRight - this.width);
furthestRightAngle = this.getIndexAngle(furthestRightIndex);
furthestLeftAngle = this.getIndexAngle(furthestLeftIndex);
radiusReductionRight = xProtrusionRight / Math.sin(furthestRightAngle + Math.PI/2);
radiusReductionLeft = xProtrusionLeft / Math.sin(furthestLeftAngle + Math.PI/2);
// Ensure we actually need to reduce the size of the chart
radiusReductionRight = (isNumber(radiusReductionRight)) ? radiusReductionRight : 0;
radiusReductionLeft = (isNumber(radiusReductionLeft)) ? radiusReductionLeft : 0;
this.drawingArea = largestPossibleRadius - (radiusReductionLeft + radiusReductionRight)/2;
//this.drawingArea = min([maxWidthRadius, (this.height - (2 * (this.pointLabelFontSize + 5)))/2])
this.setCenterPoint(radiusReductionLeft, radiusReductionRight);
},
setCenterPoint: function(leftMovement, rightMovement){
var maxRight = this.width - rightMovement - this.drawingArea,
maxLeft = leftMovement + this.drawingArea;
this.xCenter = (maxLeft + maxRight)/2;
// Always vertically in the centre as the text height doesn't change
this.yCenter = (this.height/2);
},
getIndexAngle : function(index){
var angleMultiplier = (Math.PI * 2) / this.valuesCount;
// Start from the top instead of right, so remove a quarter of the circle
return index * angleMultiplier - (Math.PI/2);
},
getPointPosition : function(index, distanceFromCenter){
var thisAngle = this.getIndexAngle(index);
return {
x : (Math.cos(thisAngle) * distanceFromCenter) + this.xCenter,
y : (Math.sin(thisAngle) * distanceFromCenter) + this.yCenter
};
},
draw: function(){
if (this.display){
var ctx = this.ctx;
each(this.yLabels, function(label, index){
// Don't draw a centre value
if (index > 0){
var yCenterOffset = index * (this.drawingArea/this.steps),
yHeight = this.yCenter - yCenterOffset,
pointPosition;
// Draw circular lines around the scale
if (this.lineWidth > 0){
ctx.strokeStyle = this.lineColor;
ctx.lineWidth = this.lineWidth;
if(this.lineArc){
ctx.beginPath();
ctx.arc(this.xCenter, this.yCenter, yCenterOffset, 0, Math.PI*2);
ctx.closePath();
ctx.stroke();
} else{
ctx.beginPath();
for (var i=0;i<this.valuesCount;i++)
{
pointPosition = this.getPointPosition(i, this.calculateCenterOffset(this.min + (index * this.stepValue)));
if (i === 0){
ctx.moveTo(pointPosition.x, pointPosition.y);
} else {
ctx.lineTo(pointPosition.x, pointPosition.y);
}
}
ctx.closePath();
ctx.stroke();
}
}
if(this.showLabels){
ctx.font = fontString(this.fontSize,this.fontStyle,this.fontFamily);
if (this.showLabelBackdrop){
var labelWidth = ctx.measureText(label).width;
ctx.fillStyle = this.backdropColor;
ctx.fillRect(
this.xCenter - labelWidth/2 - this.backdropPaddingX,
yHeight - this.fontSize/2 - this.backdropPaddingY,
labelWidth + this.backdropPaddingX*2,
this.fontSize + this.backdropPaddingY*2
);
}
ctx.textAlign = 'center';
ctx.textBaseline = "middle";
ctx.fillStyle = this.fontColor;
ctx.fillText(label, this.xCenter, yHeight);
}
}
}, this);
if (!this.lineArc){
ctx.lineWidth = this.angleLineWidth;
ctx.strokeStyle = this.angleLineColor;
for (var i = this.valuesCount - 1; i >= 0; i--) {
if (this.angleLineWidth > 0){
var outerPosition = this.getPointPosition(i, this.calculateCenterOffset(this.max));
ctx.beginPath();
ctx.moveTo(this.xCenter, this.yCenter);
ctx.lineTo(outerPosition.x, outerPosition.y);
ctx.stroke();
ctx.closePath();
}
// Extra 3px out for some label spacing
var pointLabelPosition = this.getPointPosition(i, this.calculateCenterOffset(this.max) + 5);
ctx.font = fontString(this.pointLabelFontSize,this.pointLabelFontStyle,this.pointLabelFontFamily);
ctx.fillStyle = this.pointLabelFontColor;
var labelsCount = this.labels.length,
halfLabelsCount = this.labels.length/2,
quarterLabelsCount = halfLabelsCount/2,
upperHalf = (i < quarterLabelsCount || i > labelsCount - quarterLabelsCount),
exactQuarter = (i === quarterLabelsCount || i === labelsCount - quarterLabelsCount);
if (i === 0){
ctx.textAlign = 'center';
} else if(i === halfLabelsCount){
ctx.textAlign = 'center';
} else if (i < halfLabelsCount){
ctx.textAlign = 'left';
} else {
ctx.textAlign = 'right';
}
// Set the correct text baseline based on outer positioning
if (exactQuarter){
ctx.textBaseline = 'middle';
} else if (upperHalf){
ctx.textBaseline = 'bottom';
} else {
ctx.textBaseline = 'top';
}
ctx.fillText(this.labels[i], pointLabelPosition.x, pointLabelPosition.y);
}
}
}
}
});
// 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);