Skip to content

Instantly share code, notes, and snippets.

@impronunciable

impronunciable/chart.js

Created June 12, 2013 05:08
Show Gist options
  • Save impronunciable/5762955 to your computer and use it in GitHub Desktop.
Save impronunciable/5762955 to your computer and use it in GitHub Desktop.
Download ZIP
Raw
chart.js
/*!
* Chart.js
* http://chartjs.org/
*
* Copyright 2013 Nick Downie
* Released under the MIT license
* https://github.com/nnnick/Chart.js/blob/master/LICENSE.md
*/
//Define the global Chart Variable as a class.
module.exports = function(context){
var chart = this;
//Easing functions adapted from Robert Penner's easing equations
//http://www.robertpenner.com/easing/
var animationOptions = {
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*.3;
if (a < Math.abs(1)) { a=1; var s=p/4; }
else var 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*.3;
if (a < Math.abs(1)) { a=1; var s=p/4; }
else var 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*(.3*1.5);
if (a < Math.abs(1)) { a=1; var s=p/4; }
else var s = p/(2*Math.PI) * Math.asin (1/a);
if (t < 1) return -.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 )*.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 - animationOptions.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 + .75);
} else if (t < (2.5/2.75)) {
return 1*(7.5625*(t-=(2.25/2.75))*t + .9375);
} else {
return 1*(7.5625*(t-=(2.625/2.75))*t + .984375);
}
},
easeInOutBounce: function (t) {
if (t < 1/2) return animationOptions.easeInBounce (t*2) * .5;
return animationOptions.easeOutBounce (t*2-1) * .5 + 1*.5;
}
};
//Variables global to the chart
var width = context.canvas.width;
var height = context.canvas.height;
/* TODO: Check this out
//High pixel density displays - multiply the size of the canvas height/width by the device pixel ratio, then scale.
if (window.devicePixelRatio) {
context.canvas.style.width = width + "px";
context.canvas.style.height = height + "px";
context.canvas.height = height * window.devicePixelRatio;
context.canvas.width = width * window.devicePixelRatio;
context.scale(window.devicePixelRatio, window.devicePixelRatio);
}
*/
this.PolarArea = function(data,options){
chart.PolarArea.defaults = {
scaleOverlay : true,
scaleOverride : false,
scaleSteps : null,
scaleStepWidth : null,
scaleStartValue : null,
scaleShowLine : true,
scaleLineColor : "rgba(0,0,0,.1)",
scaleLineWidth : 1,
scaleShowLabels : true,
scaleLabel : "<%=value%>",
scaleFontFamily : "'menlo'",
scaleFontSize : 12,
scaleFontStyle : "normal",
scaleFontColor : "#666",
scaleShowLabelBackdrop : true,
scaleBackdropColor : "rgba(255,255,255,0.75)",
scaleBackdropPaddingY : 2,
scaleBackdropPaddingX : 2,
segmentShowStroke : true,
segmentStrokeColor : "#fff",
segmentStrokeWidth : 2,
animation : true,
animationSteps : 100,
animationEasing : "easeOutBounce",
animateRotate : true,
animateScale : false,
onAnimationComplete : null
};
var config = (options)? mergeChartConfig(chart.PolarArea.defaults,options) : chart.PolarArea.defaults;
return new PolarArea(data,config,context);
};
this.Radar = function(data,options){
chart.Radar.defaults = {
scaleOverlay : false,
scaleOverride : false,
scaleSteps : null,
scaleStepWidth : null,
scaleStartValue : null,
scaleShowLine : true,
scaleLineColor : "rgba(0,0,0,.1)",
scaleLineWidth : 1,
scaleShowLabels : false,
scaleLabel : "<%=value%>",
scaleFontFamily : "'menlo'",
scaleFontSize : 12,
scaleFontStyle : "normal",
scaleFontColor : "#666",
scaleShowLabelBackdrop : true,
scaleBackdropColor : "rgba(255,255,255,0.75)",
scaleBackdropPaddingY : 2,
scaleBackdropPaddingX : 2,
angleShowLineOut : true,
angleLineColor : "rgba(0,0,0,.1)",
angleLineWidth : 1,
pointLabelFontFamily : "'menlo'",
pointLabelFontStyle : "normal",
pointLabelFontSize : 12,
pointLabelFontColor : "#666",
pointDot : true,
pointDotRadius : 3,
pointDotStrokeWidth : 1,
datasetStroke : true,
datasetStrokeWidth : 2,
datasetFill : true,
animation : true,
animationSteps : 60,
animationEasing : "easeOutQuart",
onAnimationComplete : null
};
var config = (options)? mergeChartConfig(chart.Radar.defaults,options) : chart.Radar.defaults;
return new Radar(data,config,context);
};
this.Pie = function(data,options){
chart.Pie.defaults = {
segmentShowStroke : true,
segmentStrokeColor : "#fff",
segmentStrokeWidth : 2,
animation : true,
animationSteps : 100,
animationEasing : "easeOutBounce",
animateRotate : true,
animateScale : false,
onAnimationComplete : null
};
var config = (options)? mergeChartConfig(chart.Pie.defaults,options) : chart.Pie.defaults;
return new Pie(data,config,context);
};
this.Doughnut = function(data,options){
chart.Doughnut.defaults = {
segmentShowStroke : true,
segmentStrokeColor : "#fff",
segmentStrokeWidth : 2,
percentageInnerCutout : 50,
animation : true,
animationSteps : 100,
animationEasing : "easeOutBounce",
animateRotate : true,
animateScale : false,
onAnimationComplete : null
};
var config = (options)? mergeChartConfig(chart.Doughnut.defaults,options) : chart.Doughnut.defaults;
return new Doughnut(data,config,context);
};
this.Line = function(data,options){
chart.Line.defaults = {
scaleOverlay : false,
scaleOverride : false,
scaleSteps : null,
scaleStepWidth : null,
scaleStartValue : null,
scaleLineColor : "rgba(0,0,0,.1)",
scaleLineWidth : 1,
scaleShowLabels : true,
scaleLabel : "<%=value%>",
scaleFontFamily : "'menlo'",
scaleFontSize : 12,
scaleFontStyle : "normal",
scaleFontColor : "#666",
scaleShowGridLines : true,
scaleGridLineColor : "rgba(0,0,0,.05)",
scaleGridLineWidth : 1,
bezierCurve : true,
pointDot : true,
pointDotRadius : 4,
pointDotStrokeWidth : 2,
datasetStroke : true,
datasetStrokeWidth : 2,
datasetFill : true,
animation : true,
animationSteps : 60,
animationEasing : "easeOutQuart",
onAnimationComplete : null
};
var config = (options) ? mergeChartConfig(chart.Line.defaults,options) : chart.Line.defaults;
return new Line(data,config,context);
}
this.Bar = function(data,options){
chart.Bar.defaults = {
scaleOverlay : false,
scaleOverride : false,
scaleSteps : null,
scaleStepWidth : null,
scaleStartValue : null,
scaleLineColor : "rgba(0,0,0,.1)",
scaleLineWidth : 1,
scaleShowLabels : true,
scaleLabel : "<%=value%>",
scaleFontFamily : "'menlo'",
scaleFontSize : 12,
scaleFontStyle : "normal",
scaleFontColor : "#666",
scaleShowGridLines : true,
scaleGridLineColor : "rgba(0,0,0,.05)",
scaleGridLineWidth : 1,
barShowStroke : true,
barStrokeWidth : 2,
barValueSpacing : 5,
barDatasetSpacing : 1,
animation : true,
animationSteps : 60,
animationEasing : "easeOutQuart",
onAnimationComplete : null
};
var config = (options) ? mergeChartConfig(chart.Bar.defaults,options) : chart.Bar.defaults;
return new Bar(data,config,context);
}
var clear = function(c){
c.clearRect(0, 0, width, height);
};
var PolarArea = function(data,config,ctx){
var maxSize, scaleHop, calculatedScale, labelHeight, scaleHeight, valueBounds, labelTemplateString;
calculateDrawingSizes();
valueBounds = getValueBounds();
labelTemplateString = (config.scaleShowLabels)? config.scaleLabel : null;
//Check and set the scale
if (!config.scaleOverride){
calculatedScale = calculateScale(scaleHeight,valueBounds.maxSteps,valueBounds.minSteps,valueBounds.maxValue,valueBounds.minValue,labelTemplateString);
}
else {
calculatedScale = {
steps : config.scaleSteps,
stepValue : config.scaleStepWidth,
graphMin : config.scaleStartValue,
labels : []
}
populateLabels(labelTemplateString, calculatedScale.labels,calculatedScale.steps,config.scaleStartValue,config.scaleStepWidth);
}
scaleHop = maxSize/(calculatedScale.steps);
//Wrap in an animation loop wrapper
animationLoop(config,drawScale,drawAllSegments,ctx);
function calculateDrawingSizes(){
maxSize = (Min([width,height])/2);
//Remove whatever is larger - the font size or line width.
maxSize -= Max([config.scaleFontSize*0.5,config.scaleLineWidth*0.5]);
labelHeight = config.scaleFontSize*2;
//If we're drawing the backdrop - add the Y padding to the label height and remove from drawing region.
if (config.scaleShowLabelBackdrop){
labelHeight += (2 * config.scaleBackdropPaddingY);
maxSize -= config.scaleBackdropPaddingY*1.5;
}
scaleHeight = maxSize;
//If the label height is less than 5, set it to 5 so we don't have lines on top of each other.
labelHeight = Default(labelHeight,5);
}
function drawScale(){
for (var i=0; i<calculatedScale.steps; i++){
//If the line object is there
if (config.scaleShowLine){
ctx.beginPath();
ctx.arc(width/2, height/2, scaleHop * (i + 1), 0, (Math.PI * 2), true);
ctx.strokeStyle = config.scaleLineColor;
ctx.lineWidth = config.scaleLineWidth;
ctx.stroke();
}
if (config.scaleShowLabels){
ctx.textAlign = "center";
ctx.font = config.scaleFontStyle + " " + config.scaleFontSize + "px " + config.scaleFontFamily;
var label = calculatedScale.labels[i];
//If the backdrop object is within the font object
if (config.scaleShowLabelBackdrop){
var textWidth = ctx.measureText(label).width;
ctx.fillStyle = config.scaleBackdropColor;
ctx.beginPath();
ctx.rect(
Math.round(width/2 - textWidth/2 - config.scaleBackdropPaddingX), //X
Math.round(height/2 - (scaleHop * (i + 1)) - config.scaleFontSize*0.5 - config.scaleBackdropPaddingY),//Y
Math.round(textWidth + (config.scaleBackdropPaddingX*2)), //Width
Math.round(config.scaleFontSize + (config.scaleBackdropPaddingY*2)) //Height
);
ctx.fill();
}
ctx.textBaseline = "middle";
ctx.fillStyle = config.scaleFontColor;
ctx.fillText(label,width/2,height/2 - (scaleHop * (i + 1)));
}
}
}
function drawAllSegments(animationDecimal){
var startAngle = -Math.PI/2,
angleStep = (Math.PI*2)/data.length,
scaleAnimation = 1,
rotateAnimation = 1;
if (config.animation) {
if (config.animateScale) {
scaleAnimation = animationDecimal;
}
if (config.animateRotate){
rotateAnimation = animationDecimal;
}
}
for (var i=0; i<data.length; i++){
ctx.beginPath();
ctx.arc(width/2,height/2,scaleAnimation * calculateOffset(data[i].value,calculatedScale,scaleHop),startAngle, startAngle + rotateAnimation*angleStep, false);
ctx.lineTo(width/2,height/2);
ctx.closePath();
ctx.fillStyle = data[i].color;
ctx.fill();
if(config.segmentShowStroke){
ctx.strokeStyle = config.segmentStrokeColor;
ctx.lineWidth = config.segmentStrokeWidth;
ctx.stroke();
}
startAngle += rotateAnimation*angleStep;
}
}
function getValueBounds() {
var upperValue = Number.MIN_VALUE;
var lowerValue = Number.MAX_VALUE;
for (var i=0; i<data.length; i++){
if (data[i].value > upperValue) {upperValue = data[i].value;}
if (data[i].value < lowerValue) {lowerValue = data[i].value;}
};
var maxSteps = Math.floor((scaleHeight / (labelHeight*0.66)));
var minSteps = Math.floor((scaleHeight / labelHeight*0.5));
return {
maxValue : upperValue,
minValue : lowerValue,
maxSteps : maxSteps,
minSteps : minSteps
};
}
}
var Radar = function (data,config,ctx) {
var maxSize, scaleHop, calculatedScale, labelHeight, scaleHeight, valueBounds, labelTemplateString;
//If no labels are defined set to an empty array, so referencing length for looping doesn't blow up.
if (!data.labels) data.labels = [];
calculateDrawingSizes();
var valueBounds = getValueBounds();
labelTemplateString = (config.scaleShowLabels)? config.scaleLabel : null;
//Check and set the scale
if (!config.scaleOverride){
calculatedScale = calculateScale(scaleHeight,valueBounds.maxSteps,valueBounds.minSteps,valueBounds.maxValue,valueBounds.minValue,labelTemplateString);
}
else {
calculatedScale = {
steps : config.scaleSteps,
stepValue : config.scaleStepWidth,
graphMin : config.scaleStartValue,
labels : []
}
populateLabels(labelTemplateString, calculatedScale.labels,calculatedScale.steps,config.scaleStartValue,config.scaleStepWidth);
}
scaleHop = maxSize/(calculatedScale.steps);
animationLoop(config,drawScale,drawAllDataPoints,ctx);
//Radar specific functions.
function drawAllDataPoints(animationDecimal){
var rotationDegree = (2*Math.PI)/data.datasets[0].data.length;
ctx.save();
//translate to the centre of the canvas.
ctx.translate(width/2,height/2);
//We accept multiple data sets for radar charts, so show loop through each set
for (var i=0; i<data.datasets.length; i++){
ctx.beginPath();
ctx.moveTo(0,animationDecimal*(-1*calculateOffset(data.datasets[i].data[0],calculatedScale,scaleHop)));
for (var j=1; j<data.datasets[i].data.length; j++){
ctx.rotate(rotationDegree);
ctx.lineTo(0,animationDecimal*(-1*calculateOffset(data.datasets[i].data[j],calculatedScale,scaleHop)));
}
ctx.closePath();
ctx.fillStyle = data.datasets[i].fillColor;
ctx.strokeStyle = data.datasets[i].strokeColor;
ctx.lineWidth = config.datasetStrokeWidth;
ctx.fill();
ctx.stroke();
if (config.pointDot){
ctx.fillStyle = data.datasets[i].pointColor;
ctx.strokeStyle = data.datasets[i].pointStrokeColor;
ctx.lineWidth = config.pointDotStrokeWidth;
for (var k=0; k<data.datasets[i].data.length; k++){
ctx.rotate(rotationDegree);
ctx.beginPath();
ctx.arc(0,animationDecimal*(-1*calculateOffset(data.datasets[i].data[k],calculatedScale,scaleHop)),config.pointDotRadius,2*Math.PI,false);
ctx.fill();
ctx.stroke();
}
}
ctx.rotate(rotationDegree);
}
ctx.restore();
}
function drawScale(){
var rotationDegree = (2*Math.PI)/data.datasets[0].data.length;
ctx.save();
ctx.translate(width / 2, height / 2);
if (config.angleShowLineOut){
ctx.strokeStyle = config.angleLineColor;
ctx.lineWidth = config.angleLineWidth;
for (var h=0; h<data.datasets[0].data.length; h++){
ctx.rotate(rotationDegree);
ctx.beginPath();
ctx.moveTo(0,0);
ctx.lineTo(0,-maxSize);
ctx.stroke();
}
}
for (var i=0; i<calculatedScale.steps; i++){
ctx.beginPath();
if(config.scaleShowLine){
ctx.strokeStyle = config.scaleLineColor;
ctx.lineWidth = config.scaleLineWidth;
ctx.moveTo(0,-scaleHop * (i+1));
for (var j=0; j<data.datasets[0].data.length; j++){
ctx.rotate(rotationDegree);
ctx.lineTo(0,-scaleHop * (i+1));
}
ctx.closePath();
ctx.stroke();
}
if (config.scaleShowLabels){
ctx.textAlign = 'center';
ctx.font = config.scaleFontStyle + " " + config.scaleFontSize+"px " + config.scaleFontFamily;
ctx.textBaseline = "middle";
if (config.scaleShowLabelBackdrop){
var textWidth = ctx.measureText(calculatedScale.labels[i]).width;
ctx.fillStyle = config.scaleBackdropColor;
ctx.beginPath();
ctx.rect(
Math.round(- textWidth/2 - config.scaleBackdropPaddingX), //X
Math.round((-scaleHop * (i + 1)) - config.scaleFontSize*0.5 - config.scaleBackdropPaddingY),//Y
Math.round(textWidth + (config.scaleBackdropPaddingX*2)), //Width
Math.round(config.scaleFontSize + (config.scaleBackdropPaddingY*2)) //Height
);
ctx.fill();
}
ctx.fillStyle = config.scaleFontColor;
ctx.fillText(calculatedScale.labels[i],0,-scaleHop*(i+1));
}
}
for (var k=0; k<data.labels.length; k++){
ctx.font = config.pointLabelFontStyle + " " + config.pointLabelFontSize+"px " + config.pointLabelFontFamily;
ctx.fillStyle = config.pointLabelFontColor;
var opposite = Math.sin(rotationDegree*k) * (maxSize + config.pointLabelFontSize);
var adjacent = Math.cos(rotationDegree*k) * (maxSize + config.pointLabelFontSize);
if(rotationDegree*k == Math.PI || rotationDegree*k == 0){
ctx.textAlign = "center";
}
else if(rotationDegree*k > Math.PI){
ctx.textAlign = "right";
}
else{
ctx.textAlign = "left";
}
ctx.textBaseline = "middle";
ctx.fillText(data.labels[k],opposite,-adjacent);
}
ctx.restore();
};
function calculateDrawingSizes(){
maxSize = (Min([width,height])/2);
labelHeight = config.scaleFontSize*2;
var labelLength = 0;
for (var i=0; i<data.labels.length; i++){
ctx.font = config.pointLabelFontStyle + " " + config.pointLabelFontSize+"px " + config.pointLabelFontFamily;
var textMeasurement = ctx.measureText(data.labels[i]).width;
if(textMeasurement>labelLength) labelLength = textMeasurement;
}
//Figure out whats the largest - the height of the text or the width of what's there, and minus it from the maximum usable size.
maxSize -= Max([labelLength,((config.pointLabelFontSize/2)*1.5)]);
maxSize -= config.pointLabelFontSize;
maxSize = CapValue(maxSize, null, 0);
scaleHeight = maxSize;
//If the label height is less than 5, set it to 5 so we don't have lines on top of each other.
labelHeight = Default(labelHeight,5);
};
function getValueBounds() {
var upperValue = Number.MIN_VALUE;
var lowerValue = Number.MAX_VALUE;
for (var i=0; i<data.datasets.length; i++){
for (var j=0; j<data.datasets[i].data.length; j++){
if (data.datasets[i].data[j] > upperValue){upperValue = data.datasets[i].data[j]}
if (data.datasets[i].data[j] < lowerValue){lowerValue = data.datasets[i].data[j]}
}
}
var maxSteps = Math.floor((scaleHeight / (labelHeight*0.66)));
var minSteps = Math.floor((scaleHeight / labelHeight*0.5));
return {
maxValue : upperValue,
minValue : lowerValue,
maxSteps : maxSteps,
minSteps : minSteps
};
}
}
var Pie = function(data,config,ctx){
var segmentTotal = 0;
//In case we have a canvas that is not a square. Minus 5 pixels as padding round the edge.
var pieRadius = Min([height/2,width/2]) - 5;
for (var i=0; i<data.length; i++){
segmentTotal += data[i].value;
}
animationLoop(config,null,drawPieSegments,ctx);
function drawPieSegments (animationDecimal){
var cumulativeAngle = -Math.PI/2,
scaleAnimation = 1,
rotateAnimation = 1;
if (config.animation) {
if (config.animateScale) {
scaleAnimation = animationDecimal;
}
if (config.animateRotate){
rotateAnimation = animationDecimal;
}
}
for (var i=0; i<data.length; i++){
var segmentAngle = rotateAnimation * ((data[i].value/segmentTotal) * (Math.PI*2));
ctx.beginPath();
ctx.arc(width/2,height/2,scaleAnimation * pieRadius,cumulativeAngle,cumulativeAngle + segmentAngle);
ctx.lineTo(width/2,height/2);
ctx.closePath();
ctx.fillStyle = data[i].color;
ctx.fill();
if(config.segmentShowStroke){
ctx.lineWidth = config.segmentStrokeWidth;
ctx.strokeStyle = config.segmentStrokeColor;
ctx.stroke();
}
cumulativeAngle += segmentAngle;
}
}
}
var Doughnut = function(data,config,ctx){
var segmentTotal = 0;
//In case we have a canvas that is not a square. Minus 5 pixels as padding round the edge.
var doughnutRadius = Min([height/2,width/2]) - 5;
var cutoutRadius = doughnutRadius * (config.percentageInnerCutout/100);
for (var i=0; i<data.length; i++){
segmentTotal += data[i].value;
}
animationLoop(config,null,drawPieSegments,ctx);
function drawPieSegments (animationDecimal){
var cumulativeAngle = -Math.PI/2,
scaleAnimation = 1,
rotateAnimation = 1;
if (config.animation) {
if (config.animateScale) {
scaleAnimation = animationDecimal;
}
if (config.animateRotate){
rotateAnimation = animationDecimal;
}
}
for (var i=0; i<data.length; i++){
var segmentAngle = rotateAnimation * ((data[i].value/segmentTotal) * (Math.PI*2));
ctx.beginPath();
ctx.arc(width/2,height/2,scaleAnimation * doughnutRadius,cumulativeAngle,cumulativeAngle + segmentAngle,false);
ctx.arc(width/2,height/2,scaleAnimation * cutoutRadius,cumulativeAngle + segmentAngle,cumulativeAngle,true);
ctx.closePath();
ctx.fillStyle = data[i].color;
ctx.fill();
if(config.segmentShowStroke){
ctx.lineWidth = config.segmentStrokeWidth;
ctx.strokeStyle = config.segmentStrokeColor;
ctx.stroke();
}
cumulativeAngle += segmentAngle;
}
}
}
var Line = function(data,config,ctx){
var maxSize, scaleHop, calculatedScale, labelHeight, scaleHeight, valueBounds, labelTemplateString, valueHop,widestXLabel, xAxisLength,yAxisPosX,xAxisPosY, rotateLabels = 0;
calculateDrawingSizes();
valueBounds = getValueBounds();
//Check and set the scale
labelTemplateString = (config.scaleShowLabels)? config.scaleLabel : "";
if (!config.scaleOverride){
calculatedScale = calculateScale(scaleHeight,valueBounds.maxSteps,valueBounds.minSteps,valueBounds.maxValue,valueBounds.minValue,labelTemplateString);
}
else {
calculatedScale = {
steps : config.scaleSteps,
stepValue : config.scaleStepWidth,
graphMin : config.scaleStartValue,
labels : []
}
populateLabels(labelTemplateString, calculatedScale.labels,calculatedScale.steps,config.scaleStartValue,config.scaleStepWidth);
}
scaleHop = Math.floor(scaleHeight/calculatedScale.steps);
calculateXAxisSize();
animationLoop(config,drawScale,drawLines,ctx);
function drawLines(animPc){
for (var i=0; i<data.datasets.length; i++){
ctx.strokeStyle = data.datasets[i].strokeColor;
ctx.lineWidth = config.datasetStrokeWidth;
ctx.beginPath();
ctx.moveTo(yAxisPosX, xAxisPosY - animPc*(calculateOffset(data.datasets[i].data[0],calculatedScale,scaleHop)))
for (var j=1; j<data.datasets[i].data.length; j++){
if (config.bezierCurve){
ctx.bezierCurveTo(xPos(j-0.5),yPos(i,j-1),xPos(j-0.5),yPos(i,j),xPos(j),yPos(i,j));
}
else{
ctx.lineTo(xPos(j),yPos(i,j));
}
}
ctx.stroke();
if (config.datasetFill){
ctx.lineTo(yAxisPosX + (valueHop*(data.datasets[i].data.length-1)),xAxisPosY);
ctx.lineTo(yAxisPosX,xAxisPosY);
ctx.closePath();
ctx.fillStyle = data.datasets[i].fillColor;
ctx.fill();
}
else{
ctx.closePath();
}
if(config.pointDot){
ctx.fillStyle = data.datasets[i].pointColor;
ctx.strokeStyle = data.datasets[i].pointStrokeColor;
ctx.lineWidth = config.pointDotStrokeWidth;
for (var k=0; k<data.datasets[i].data.length; k++){
ctx.beginPath();
ctx.arc(yAxisPosX + (valueHop *k),xAxisPosY - animPc*(calculateOffset(data.datasets[i].data[k],calculatedScale,scaleHop)),config.pointDotRadius,0,Math.PI*2,true);
ctx.fill();
ctx.stroke();
}
}
}
function yPos(dataSet,iteration){
return xAxisPosY - animPc*(calculateOffset(data.datasets[dataSet].data[iteration],calculatedScale,scaleHop));
}
function xPos(iteration){
return yAxisPosX + (valueHop * iteration);
}
}
function drawScale(){
//X axis line
ctx.lineWidth = config.scaleLineWidth;
ctx.strokeStyle = config.scaleLineColor;
ctx.beginPath();
ctx.moveTo(width-widestXLabel/2+5,xAxisPosY);
ctx.lineTo(width-(widestXLabel/2)-xAxisLength-5,xAxisPosY);
ctx.stroke();
if (rotateLabels > 0){
ctx.save();
ctx.textAlign = "right";
}
else{
ctx.textAlign = "center";
}
ctx.fillStyle = config.scaleFontColor;
for (var i=0; i<data.labels.length; i++){
ctx.save();
if (rotateLabels > 0){
ctx.translate(yAxisPosX + i*valueHop,xAxisPosY + config.scaleFontSize);
ctx.rotate(-(rotateLabels * (Math.PI/180)));
ctx.fillText(data.labels[i], 0,0);
ctx.restore();
}
else{
ctx.fillText(data.labels[i], yAxisPosX + i*valueHop,xAxisPosY + config.scaleFontSize+3);
}
ctx.beginPath();
ctx.moveTo(yAxisPosX + i * valueHop, xAxisPosY+3);
//Check i isnt 0, so we dont go over the Y axis twice.
if(config.scaleShowGridLines && i>0){
ctx.lineWidth = config.scaleGridLineWidth;
ctx.strokeStyle = config.scaleGridLineColor;
ctx.lineTo(yAxisPosX + i * valueHop, 5);
}
else{
ctx.lineTo(yAxisPosX + i * valueHop, xAxisPosY+3);
}
ctx.stroke();
}
//Y axis
ctx.lineWidth = config.scaleLineWidth;
ctx.strokeStyle = config.scaleLineColor;
ctx.beginPath();
ctx.moveTo(yAxisPosX,xAxisPosY+5);
ctx.lineTo(yAxisPosX,5);
ctx.stroke();
ctx.textAlign = "right";
ctx.textBaseline = "middle";
for (var j=0; j<calculatedScale.steps; j++){
ctx.beginPath();
ctx.moveTo(yAxisPosX-3,xAxisPosY - ((j+1) * scaleHop));
if (config.scaleShowGridLines){
ctx.lineWidth = config.scaleGridLineWidth;
ctx.strokeStyle = config.scaleGridLineColor;
ctx.lineTo(yAxisPosX + xAxisLength + 5,xAxisPosY - ((j+1) * scaleHop));
}
else{
ctx.lineTo(yAxisPosX-0.5,xAxisPosY - ((j+1) * scaleHop));
}
ctx.stroke();
if (config.scaleShowLabels){
ctx.fillText(calculatedScale.labels[j],yAxisPosX-8,xAxisPosY - ((j+1) * scaleHop));
}
}
}
function calculateXAxisSize(){
var longestText = 1;
//if we are showing the labels
if (config.scaleShowLabels){
ctx.font = config.scaleFontStyle + " " + config.scaleFontSize+"px " + config.scaleFontFamily;
for (var i=0; i<calculatedScale.labels.length; i++){
var measuredText = ctx.measureText(calculatedScale.labels[i]).width;
longestText = (measuredText > longestText)? measuredText : longestText;
}
//Add a little extra padding from the y axis
longestText +=10;
}
xAxisLength = width - longestText - widestXLabel;
valueHop = Math.floor(xAxisLength/(data.labels.length-1));
yAxisPosX = width-widestXLabel/2-xAxisLength;
xAxisPosY = scaleHeight + config.scaleFontSize/2;
}
function calculateDrawingSizes(){
maxSize = height;
//Need to check the X axis first - measure the length of each text metric, and figure out if we need to rotate by 45 degrees.
ctx.font = config.scaleFontStyle + " " + config.scaleFontSize+"px " + config.scaleFontFamily;
widestXLabel = 1;
for (var i=0; i<data.labels.length; i++){
var textLength = ctx.measureText(data.labels[i]).width;
//If the text length is longer - make that equal to longest text!
widestXLabel = (textLength > widestXLabel)? textLength : widestXLabel;
}
if (width/data.labels.length < widestXLabel){
rotateLabels = 45;
if (width/data.labels.length < Math.cos(rotateLabels) * widestXLabel){
rotateLabels = 90;
maxSize -= widestXLabel;
}
else{
maxSize -= Math.sin(rotateLabels) * widestXLabel;
}
}
else{
maxSize -= config.scaleFontSize;
}
//Add a little padding between the x line and the text
maxSize -= 5;
labelHeight = config.scaleFontSize;
maxSize -= labelHeight;
//Set 5 pixels greater than the font size to allow for a little padding from the X axis.
scaleHeight = maxSize;
//Then get the area above we can safely draw on.
}
function getValueBounds() {
var upperValue = Number.MIN_VALUE;
var lowerValue = Number.MAX_VALUE;
for (var i=0; i<data.datasets.length; i++){
for (var j=0; j<data.datasets[i].data.length; j++){
if ( data.datasets[i].data[j] > upperValue) { upperValue = data.datasets[i].data[j] };
if ( data.datasets[i].data[j] < lowerValue) { lowerValue = data.datasets[i].data[j] };
}
};
var maxSteps = Math.floor((scaleHeight / (labelHeight*0.66)));
var minSteps = Math.floor((scaleHeight / labelHeight*0.5));
return {
maxValue : upperValue,
minValue : lowerValue,
maxSteps : maxSteps,
minSteps : minSteps
};
}
}
var Bar = function(data,config,ctx){
var maxSize, scaleHop, calculatedScale, labelHeight, scaleHeight, valueBounds, labelTemplateString, valueHop,widestXLabel, xAxisLength,yAxisPosX,xAxisPosY,barWidth, rotateLabels = 0;
calculateDrawingSizes();
valueBounds = getValueBounds();
//Check and set the scale
labelTemplateString = (config.scaleShowLabels)? config.scaleLabel : "";
if (!config.scaleOverride){
calculatedScale = calculateScale(scaleHeight,valueBounds.maxSteps,valueBounds.minSteps,valueBounds.maxValue,valueBounds.minValue,labelTemplateString);
}
else {
calculatedScale = {
steps : config.scaleSteps,
stepValue : config.scaleStepWidth,
graphMin : config.scaleStartValue,
labels : []
}
populateLabels(labelTemplateString, calculatedScale.labels,calculatedScale.steps,config.scaleStartValue,config.scaleStepWidth);
}
scaleHop = Math.floor(scaleHeight/calculatedScale.steps);
calculateXAxisSize();
animationLoop(config,drawScale,drawBars,ctx);
function drawBars(animPc){
ctx.lineWidth = config.barStrokeWidth;
for (var i=0; i<data.datasets.length; i++){
ctx.fillStyle = data.datasets[i].fillColor;
ctx.strokeStyle = data.datasets[i].strokeColor;
for (var j=0; j<data.datasets[i].data.length; j++){
var barOffset = yAxisPosX + config.barValueSpacing + valueHop*j + barWidth*i + config.barDatasetSpacing*i + config.barStrokeWidth*i;
ctx.beginPath();
ctx.moveTo(barOffset, xAxisPosY);
ctx.lineTo(barOffset, xAxisPosY - animPc*calculateOffset(data.datasets[i].data[j],calculatedScale,scaleHop)+(config.barStrokeWidth/2));
ctx.lineTo(barOffset + barWidth, xAxisPosY - animPc*calculateOffset(data.datasets[i].data[j],calculatedScale,scaleHop)+(config.barStrokeWidth/2));
ctx.lineTo(barOffset + barWidth, xAxisPosY);
if(config.barShowStroke){
ctx.stroke();
}
ctx.closePath();
ctx.fill();
}
}
}
function drawScale(){
//X axis line
ctx.lineWidth = config.scaleLineWidth;
ctx.strokeStyle = config.scaleLineColor;
ctx.beginPath();
ctx.moveTo(width-widestXLabel/2+5,xAxisPosY);
ctx.lineTo(width-(widestXLabel/2)-xAxisLength-5,xAxisPosY);
ctx.stroke();
if (rotateLabels > 0){
ctx.save();
ctx.textAlign = "right";
}
else{
ctx.textAlign = "center";
}
ctx.fillStyle = config.scaleFontColor;
for (var i=0; i<data.labels.length; i++){
ctx.save();
if (rotateLabels > 0){
ctx.translate(yAxisPosX + i*valueHop,xAxisPosY + config.scaleFontSize);
ctx.rotate(-(rotateLabels * (Math.PI/180)));
ctx.fillText(data.labels[i], 0,0);
ctx.restore();
}
else{
ctx.fillText(data.labels[i], yAxisPosX + i*valueHop + valueHop/2,xAxisPosY + config.scaleFontSize+3);
}
ctx.beginPath();
ctx.moveTo(yAxisPosX + (i+1) * valueHop, xAxisPosY+3);
//Check i isnt 0, so we dont go over the Y axis twice.
ctx.lineWidth = config.scaleGridLineWidth;
ctx.strokeStyle = config.scaleGridLineColor;
ctx.lineTo(yAxisPosX + (i+1) * valueHop, 5);
ctx.stroke();
}
//Y axis
ctx.lineWidth = config.scaleLineWidth;
ctx.strokeStyle = config.scaleLineColor;
ctx.beginPath();
ctx.moveTo(yAxisPosX,xAxisPosY+5);
ctx.lineTo(yAxisPosX,5);
ctx.stroke();
ctx.textAlign = "right";
ctx.textBaseline = "middle";
for (var j=0; j<calculatedScale.steps; j++){
ctx.beginPath();
ctx.moveTo(yAxisPosX-3,xAxisPosY - ((j+1) * scaleHop));
if (config.scaleShowGridLines){
ctx.lineWidth = config.scaleGridLineWidth;
ctx.strokeStyle = config.scaleGridLineColor;
ctx.lineTo(yAxisPosX + xAxisLength + 5,xAxisPosY - ((j+1) * scaleHop));
}
else{
ctx.lineTo(yAxisPosX-0.5,xAxisPosY - ((j+1) * scaleHop));
}
ctx.stroke();
if (config.scaleShowLabels){
ctx.fillText(calculatedScale.labels[j],yAxisPosX-8,xAxisPosY - ((j+1) * scaleHop));
}
}
}
function calculateXAxisSize(){
var longestText = 1;
//if we are showing the labels
if (config.scaleShowLabels){
ctx.font = config.scaleFontStyle + " " + config.scaleFontSize+"px " + config.scaleFontFamily;
for (var i=0; i<calculatedScale.labels.length; i++){
var measuredText = ctx.measureText(calculatedScale.labels[i]).width;
longestText = (measuredText > longestText)? measuredText : longestText;
}
//Add a little extra padding from the y axis
longestText +=10;
}
xAxisLength = width - longestText - widestXLabel;
valueHop = Math.floor(xAxisLength/(data.labels.length));
barWidth = (valueHop - config.scaleGridLineWidth*2 - (config.barValueSpacing*2) - (config.barDatasetSpacing*data.datasets.length-1) - ((config.barStrokeWidth/2)*data.datasets.length-1))/data.datasets.length;
yAxisPosX = width-widestXLabel/2-xAxisLength;
xAxisPosY = scaleHeight + config.scaleFontSize/2;
}
function calculateDrawingSizes(){
maxSize = height;
//Need to check the X axis first - measure the length of each text metric, and figure out if we need to rotate by 45 degrees.
ctx.font = config.scaleFontStyle + " " + config.scaleFontSize+"px " + config.scaleFontFamily;
widestXLabel = 1;
for (var i=0; i<data.labels.length; i++){
var textLength = ctx.measureText(data.labels[i]).width;
//If the text length is longer - make that equal to longest text!
widestXLabel = (textLength > widestXLabel)? textLength : widestXLabel;
}
if (width/data.labels.length < widestXLabel){
rotateLabels = 45;
if (width/data.labels.length < Math.cos(rotateLabels) * widestXLabel){
rotateLabels = 90;
maxSize -= widestXLabel;
}
else{
maxSize -= Math.sin(rotateLabels) * widestXLabel;
}
}
else{
maxSize -= config.scaleFontSize;
}
//Add a little padding between the x line and the text
maxSize -= 5;
labelHeight = config.scaleFontSize;
maxSize -= labelHeight;
//Set 5 pixels greater than the font size to allow for a little padding from the X axis.
scaleHeight = maxSize;
//Then get the area above we can safely draw on.
}
function getValueBounds() {
var upperValue = Number.MIN_VALUE;
var lowerValue = Number.MAX_VALUE;
for (var i=0; i<data.datasets.length; i++){
for (var j=0; j<data.datasets[i].data.length; j++){
if ( data.datasets[i].data[j] > upperValue) { upperValue = data.datasets[i].data[j] };
if ( data.datasets[i].data[j] < lowerValue) { lowerValue = data.datasets[i].data[j] };
}
};
var maxSteps = Math.floor((scaleHeight / (labelHeight*0.66)));
var minSteps = Math.floor((scaleHeight / labelHeight*0.5));
return {
maxValue : upperValue,
minValue : lowerValue,
maxSteps : maxSteps,
minSteps : minSteps
};
}
}
function calculateOffset(val,calculatedScale,scaleHop){
var outerValue = calculatedScale.steps * calculatedScale.stepValue;
var adjustedValue = val - calculatedScale.graphMin;
var scalingFactor = CapValue(adjustedValue/outerValue,1,0);
return (scaleHop*calculatedScale.steps) * scalingFactor;
}
function animationLoop(config,drawScale,drawData,ctx){
var animFrameAmount = (config.animation)? 1/CapValue(config.animationSteps,Number.MAX_VALUE,1) : 1,
easingFunction = animationOptions[config.animationEasing],
percentAnimComplete =(config.animation)? 0 : 1;
if (typeof drawScale !== "function") drawScale = function(){};
requestAnimFrame(animLoop);
function animateFrame(){
var easeAdjustedAnimationPercent =(config.animation)? CapValue(easingFunction(percentAnimComplete),null,0) : 1;
clear(ctx);
if(config.scaleOverlay){
drawData(easeAdjustedAnimationPercent);
drawScale();
} else {
drawScale();
drawData(easeAdjustedAnimationPercent);
}
}
function animLoop(){
//We need to check if the animation is incomplete (less than 1), or complete (1).
percentAnimComplete += animFrameAmount;
animateFrame();
context.canvas.render();
//Stop the loop continuing forever
if (percentAnimComplete <= 1){
requestAnimFrame(animLoop);
}
else{
if (typeof config.onAnimationComplete == "function") config.onAnimationComplete();
}
}
}
//Declare global functions to be called within this namespace here.
// shim layer with setTimeout fallback
var requestAnimFrame = (function(){
return function(callback) {
setTimeout(callback, 1000 / 60);
};
})();
function calculateScale(drawingHeight,maxSteps,minSteps,maxValue,minValue,labelTemplateString){
var graphMin,graphMax,graphRange,stepValue,numberOfSteps,valueRange,rangeOrderOfMagnitude,decimalNum;
valueRange = maxValue - minValue;
rangeOrderOfMagnitude = calculateOrderOfMagnitude(valueRange);
graphMin = Math.floor(minValue / (1 * Math.pow(10, rangeOrderOfMagnitude))) * Math.pow(10, rangeOrderOfMagnitude);
graphMax = Math.ceil(maxValue / (1 * Math.pow(10, rangeOrderOfMagnitude))) * Math.pow(10, rangeOrderOfMagnitude);
graphRange = graphMax - graphMin;
stepValue = Math.pow(10, rangeOrderOfMagnitude);
numberOfSteps = Math.round(graphRange / stepValue);
//Compare number of steps to the max and min for that size graph, and add in half steps if need be.
while(numberOfSteps < minSteps || numberOfSteps > maxSteps) {
if (numberOfSteps < minSteps){
stepValue /= 2;
numberOfSteps = Math.round(graphRange/stepValue);
}
else{
stepValue *=2;
numberOfSteps = Math.round(graphRange/stepValue);
}
};
var labels = [];
populateLabels(labelTemplateString, labels, numberOfSteps, graphMin, stepValue);
return {
steps : numberOfSteps,
stepValue : stepValue,
graphMin : graphMin,
labels : labels
}
function calculateOrderOfMagnitude(val){
return Math.floor(Math.log(val) / Math.LN10);
}
}
//Populate an array of all the labels by interpolating the string.
function populateLabels(labelTemplateString, labels, numberOfSteps, graphMin, stepValue) {
if (labelTemplateString) {
//Fix floating point errors by setting to fixed the on the same decimal as the stepValue.
for (var i = 1; i < numberOfSteps + 1; i++) {
labels.push(tmpl(labelTemplateString, {value: (graphMin + (stepValue * i)).toFixed(getDecimalPlaces(stepValue))}));
}
}
}
//Max value from array
function Max( array ){
return Math.max.apply( Math, array );
};
//Min value from array
function Min( array ){
return Math.min.apply( Math, array );
};
//Default if undefined
function Default(userDeclared,valueIfFalse){
if(!userDeclared){
return valueIfFalse;
} else {
return userDeclared;
}
};
//Is a number function
function isNumber(n) {
return !isNaN(parseFloat(n)) && isFinite(n);
}
//Apply cap a value at a high or low number
function CapValue(valueToCap, maxValue, minValue){
if(isNumber(maxValue)) {
if( valueToCap > maxValue ) {
return maxValue;
}
}
if(isNumber(minValue)){
if ( valueToCap < minValue ){
return minValue;
}
}
return valueToCap;
}
function getDecimalPlaces (num){
var numberOfDecimalPlaces;
if (num%1!=0){
return num.toString().split(".")[1].length
}
else{
return 0;
}
}
function mergeChartConfig(defaults,userDefined){
var returnObj = {};
for (var attrname in defaults) { returnObj[attrname] = defaults[attrname]; }
for (var attrname in userDefined) { returnObj[attrname] = userDefined[attrname]; }
return returnObj;
}
//Javascript micro templating by John Resig - source at http://ejohn.org/blog/javascript-micro-templating/
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] ||
tmpl(document.getElementById(str).innerHTML) :
// 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;
};
}
Raw
line.js
var Chart = require('./chart.js')
var ac = require('ansi-canvas');
var canvas = ac({small: true});
var context = canvas.getContext('2d');
var data = {
labels : ["January","February","March","April","May","June","July"],
datasets : [
{
fillColor : "rgba(220,220,220,0.5)",
strokeColor : "rgba(220,220,220,1)",
pointColor : "rgba(220,220,220,1)",
pointStrokeColor : "#fff",
data : [65,59,90,81,56,55,40]
},
{
fillColor : "rgba(151,187,205,0.5)",
strokeColor : "rgba(151,187,205,1)",
pointColor : "rgba(151,187,205,1)",
pointStrokeColor : "#fff",
data : [28,48,40,19,96,27,100]
}
]
}
var myNewChart = new Chart(context).Line(data);
Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment