第25章 canvas绘制圆形
html
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title></title>
<script type="text/javascript" src="25.js"></script>
<style type="text/css">
body{ margin:0; padding:0;}
</style>
</head>
<body onLoad="draw('canvas')">
<canvas id="canvas" width='400' height="300"></canvas>
</body>
</html>js
// JavaScript Document
function draw(id){
var context = document.getElementById(id).getContext('2d');
context.beginPath();
context.strokeStyle = "rgb(0,0,0)";
context.arc(100,100,100,0,2*Math.PI,true);
context.closePath();
context.fillStyle = 'rgb(200,0,200)';
context.fill();
context.beginPath();
context.arc(50,75,25,0,2*Math.PI,true);
context.fillStyle = 'rgb(0,0,0)';
context.fill();
context.beginPath();
context.arc(150,75,25,0,2*Math.PI,true);
context.fillStyle = 'rgb(0,0,0)';
context.fill();
context.beginPath();
context.arc(150,75,25,0,2*Math.PI,true);
context.fillStyle = 'rgb(0,0,0)';
context.fill();
context.beginPath();
context.arc(100,125,10,0,2*Math.PI,true);
context.fillStyle = 'rgb(0,0,0)';
context.fill();
context.beginPath();
context.strokeStyle = "rgb(0,0,0)";
context.lineWidth = 5;
context.arc(100,150,25,Math.PI/6,5*Math.PI/6,false);
context.stroke();
}效果图：
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