用html5的canvas画布绘制贝塞尔曲线完整代码

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查看效果：http://keleyi.com/keleyi/phtml/html5/7.htm
完整代码：

代码如下：

!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"
html xmlns="http://www.w3.org/1999/xhtml"
head
title用html5的canvas画布绘制贝塞尔曲线/title
/head
body
div
a href="http://keleyi.com/a/bjac/j77m9131.htm" target="_blank"原文/a/div
canvas id="keleyi_com" height="300" width="400"/canvas
script type="text/javascript"
function draw(id)
{
var canvas=document.getElementById(id);
if(canvas==null)
return false;
var context=canvas.getContext('2d');
context.fillStyle="#eeeeff";
context.fillRect(0,0,400,300);
var n=0;
var dx=150;
var dy=150;
var s=100;
context.beginPath();
context.globalCompositeOperation='and';
context.fillStyle='rgb(100,255,100)';
context.strokeStyle='rgb(0,0,100)';
var x=Math.sin(0);
var y=Math.cos(0);
var dig=Math.PI/15*11;
for(var i=0;i30;i++)
{
var x=Math.sin(i*dig);
var y=Math.cos(i*dig);
context.bezierCurveTo(dx+x*s,dy+y*s-100,dx+x*s+100,dy+y*s,dx+x*s,dy+y*s);
}
context.closePath();
context.fill();
context.stroke();
}
draw("keleyi_com");
/script
/body
/html