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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>创建阴影</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(){ context.fillStyle = ‘#ff0000‘; context.shadowOffsetX=4; context.shadowOffsetY=4; context.shadowColor=‘#000‘; context.shadowBlur=‘4‘; context.fillRect(10,10,100,100); //正值为底部和右侧创建阴影 看上面那段 //负值为左侧和上面创建阴影 看下面那段 context.shadowOffsetX=-4; context.shadowOffsetY=-4; context.shadowColor=‘#000‘; context.shadowBlur=‘4‘; context.fillRect(150,10,100,100); //难道你认为他只能给方的加吗,错了啦,下面那个圆也可以,连贝塞尔曲线也可以(玩惯PS工具了,习惯叫钢笔路径了) context.shadowOffsetX=10; context.shadowOffsetY=10; context.shadowColor=‘rgb(100,100,100)‘; context.shadowBlur=‘8‘; context.arc(200,300,100,(Math.PI/180)*0,(Math.PI/180)*360,false); context.fill(); } } </script> <canvas id="canvas" width="500" height="500"> 你的浏览器无法使用canvas 如有疑问加QQ:1035417613;小白童鞋;你的支持是我最大的快乐!! </canvas> </body> </html>
shadowOffsetX,shadowOffsetY,控制阴影的位置
shadowBlur控制阴影的模糊程度
shadowColor控制阴影的颜色
类似css3的这个属性box-shadow
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原文地址:http://www.cnblogs.com/LoveOrHate/p/4442497.html