用html5的canvas畫布繪制貝塞爾曲線完整代碼

2024-08-26 00:16:37

字體：大中小

供稿：網(wǎng)友

點評：html5的canvas很強大利用其畫布可輕松繪制貝塞爾曲線，為大家以后使用方便，特于此分享實現(xiàn)代碼，有此需求的朋友可以參考下

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完整代碼：

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代碼如下:

<!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畫布繪制貝塞爾曲線</title>
</head>
<body>
<div>
<a target="_blank">原文</a></div>
<canvas></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;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>