I had a look around today for a handy pie chart that I could quickly drop into a new web app I'm working on and it seems there's a lot of bloated solutions out there. I like to keep things short and sweet so I found this one online and edited it to make it a bit more user friendly. Enjoy!
Please see right hand pane before copying my code >>
//ADD THIS BETWEEN YOUR HEAD TAGS OR TO AN EXTERNAL JS FILE:
var pieProps = new Object()
function pieChart(canvas, radius, percentages, n, colors) {
var canvas = document.getElementById(canvas)
var a = pieProps.a = canvas.getContext("2d");
pieProps.colors = colors
pieProps.i = 0
canvas.width = 3.5*radius;
canvas.height = 2.5*radius;
x = y = canvas.height/2;
a.font = "bold 12px Arial";
var u = 0;
var v = 0;
for (i=0;i < percentages.length;i++) {
v += percentages[i];
W(i)(x,y,radius,u,v);
u = v;
a.fillText(n[i], x+radius+10, y-radius/2+i*18);
}
}
function W(x,y,r,u,v) {
var a = pieProps.a
if(r) {
a.beginPath();
a.moveTo(x,y);
a.arc(x, y , r, (u||0)/50*Math.PI, (v||7)/50*Math.PI, 0);
a.lineTo(x,y);
a.fill();
} else {
a.fillStyle = '#'+pieProps.colors[pieProps.i++];
}
return W;
}
//ADD THIS TO YOUR PAGE SOMEWHERE:
<canvas id="c"> Your browser does not support the canvas element. </canvas>
//EXAMPLE USAGE:
<body onload="pieChart('c', 100, [70,25,15], ['Carbs','Protein','Fat'], ['CCCCCC','FFBF43','FF850D'])">
This code is adapted from http://reubencrane.com/canvas_pie.html
11 comments:
Nice adaptation, glad I could help!
Great example. useful information. I am learn for Jquery script on
Nice coding. http://www.dreamdestinations.in/
nice things ..a great example
If anyone want learn more about Cakephp image behavior...This is the nice blog to read...
cakephplogics.blogspot.com
nice things ..a great example
If anyone want learn more about Cakephp image behavior...This is the nice blog to read...
http://cakephplogics.blogspot.com
Thank you for sharing. Good code. I have found an interesting chart http://www.pptstar.com/diagrams/pie-charts/, but do not know how I can use them. I want to try to make such chart on your example.
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