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<!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>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>html5 canvas贝塞尔曲线篇</title>
<script src="js/modernizr.js"></script>
</head>
<body>
<h1>html5 canvas贝塞尔曲线篇</h1>
<script type="text/javascript">
window.addEventListener(‘load‘,eventWindowLoaded,false);
function eventWindowLoaded(){
canvasApp();
}
function canvasSupport(){
return Modernizr.canvas;
}
function canvasApp(){
if(!canvasSupport()){
return;
}else{
var theCanvas = document.getElementById(‘canvas‘)
var context = theCanvas.getContext("2d")
}
drawScreen();
function drawScreen(){
//颜色粉色，线宽10,
context.beginPath();
context.strokeStyle="red";
context.lineWidth=2;
context.moveTo(0,0); //从0,0开始
//context.quadraticCurveTo(cpx,cpy,x,y);
context.quadraticCurveTo(200,50,0,100); //0,100结束，创建弧线的点位于（200,25）
context.stroke();
context.closePath();
}
}
</script>
<canvas id="canvas" width="500" height="500">
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</canvas>
</body>
</html>
//context.quadraticCurveTo(cpx,cpy,x,y);
说明在代码内有注释哦
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原文地址：http://www.cnblogs.com/LoveOrHate/p/4390249.html
