can we customize canvasjs donut chart to other from?
Question
How can I customize this canvasjs donut in the first image to the other one in the second image?
This is the code for the first chart :
window.onload = function() {
chart = new CanvasJS.Chart("chartContainer2", {
title: {
text: "Title",
verticalAlign: "top",
horizontalAlign: "left"
},
data: [{
type: "doughnut",
startAngle: 20,
dataPoints: [{
y: 30,
label: "one"
}, {
y: 30,
label: "tow"
}, {
y: 50,
label: " three "
}]
}]
}), chart.render()
};
1 answers
solution1
1 ACCPTED 2014-05-22 18:26:54
You will have to customize the source code to achieve the chart you desire.
CanvasJS has a Creative Commons+Attribution License for non-commercial use. But this license does not allow any modifications to the source code. So you will have to buy a commercial license. I don't have their commercial license so I can't help with your desired modifications.
Since you will have to custom modify CanvasJS anyway, it might be easier to create your own custom code ;-)
Here's some example starting code that calculates and draws the arcs for a donut chart. Adding text labels plus some lineTo connectors should be easy.
And a Demo: http://jsfiddle.net/m1erickson/UFPQz/
<!doctype html>
<html>
<head>
<link rel="stylesheet" type="text/css" media="all" href="css/reset.css" /> <!-- reset css -->
<script type="text/javascript" src="http://code.jquery.com/jquery.min.js"></script>
<style>
body{ background-color: ivory; }
canvas{border:1px solid red;}
</style>
<script>
$(function(){
var canvas=document.getElementById("canvas");
var ctx=canvas.getContext("2d");
function DonutChart(cx,cy,radius,arcWidth,values,colors){
// save incoming chart definition
this.cx=cx;
this.cy=cy,
this.radius=radius;
this.arcWidth=arcWidth
this.colors=colors;
this.arcRadians=[];
// put spacing between each arc in the chart
this.leadPadding=Math.PI/45; // 3 degrees lead padding on arcs
// parallel arrays holding starting/ending angles of each arc
this.startRadians=[];
this.endRadians=[];
// calc sum of all values
var total=0;
for(var i=0;i<values.length;i++){ total+=values[i]; }
// calc starting & ending radian angles for each arc
var PI2=Math.PI*2;
var accumRadians=0;
var starting=0;
var ending=0;
for(var i=0;i<values.length;i++){
starting=ending+this.leadPadding;
ending=starting+PI2*values[i]/total-this.leadPadding;
this.startRadians.push(starting);
this.endRadians.push(ending);
}
};
// draw all the arcs for this chart
DonutChart.prototype.drawArcs=function(){
ctx.save();
for(var i=0;i<this.startRadians.length;i++){
ctx.beginPath();
ctx.arc(this.cx,this.cy,this.radius,this.startRadians[i],this.endRadians[i]);
ctx.lineWidth=this.arcWidth;
ctx.strokeStyle=this.colors[i];
ctx.stroke();
}
ctx.restore();
}
// TEST: draw the arcs for an example donut chart
var arcs=new DonutChart(150,150,100,10,[250,360,280,250],['red','green','blue','gold']);
arcs.drawArcs();
}); // end $(function(){});
</script>
</head>
<body>
<h4>Example arcs for a donut chart</h4>
<canvas id="canvas" width=300 height=300></canvas>
</body>
</html>
The technical post webpages of this site follow the CC BY-SA 4.0 protocol. If you need to reprint, please indicate the site URL or the original address.Any question please contact:yoyou2525@163.com.