html5 canvas从圆开始

<!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从圆开始</title>

<script src="js/modernizr.js"></script>

</head>

<body>

<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="pink";

		 context.lineWidth=10;

		 context.arc(100,100,20,(Math.PI/180)*0,(Math.PI/180)*360,false);

		 //100,100圆心的位置

		 //20半径

		 //开始喝结束的弧度制从0-360

		 //1弧度 =  π/180°弧度不是角度哦

		 //true和false对象弧线方向

		 context.stroke();

		 context.closePath();

		 context.beginPath();

		 context.arc(200,100,20,(Math.PI/180)*0,(Math.PI/180)*90,false);

		 context.stroke();

		 context.closePath();

		 context.beginPath();

		 context.arc(300,100,20,(Math.PI/180)*0,(Math.PI/180)*90,true);

		 context.stroke();

		 context.closePath();

   }

}

</script>

<canvas id="canvas" width="500" height="500">

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</canvas>

</body>

</html>
巴特西

html5 canvas从圆开始

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