<!DOCTY
PE html P
ubLIC "-//W3C//DTD XHTML 1.0 Trans
ITional//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" t
arget="_blank">原文</a></div>
<canvas id="keleyi_com" h
eight="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.be
ginPath();
context.globalComposite
operation='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;i<30;
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>