html5画布旋转效果示例
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2023-12-09 15:00:21
本文介绍了JS和html5实现画布旋转效果示例,大家参考使用吧... 14-01-27...
keleyi.htm的代码如下:
复制代码
代码如下:<!doctype html>
<html>
<head>
<title>html旋转画布</title>
<script type="text/javascript" src="/jquery-1.10.2.min.js"></script>
<script type="text/javascript" src="jb51.js"></script>
</head>
<body>
<canvas id="jb51"></canvas>
</body>
</html>
jb51.js的代码如下:
复制代码
代码如下:/*
* 功能:画布旋转
*/
(function(){
var canvas=null,
context=null,
angle=0;
function resetcanvas(){
canvas=document.getelementbyid("jb51");
canvas.width=window.innerwidth;
canvas.height=window.innerheight;
context=canvas.getcontext("2d");
}
function animate(){
context.save();
try{
//清除画布
context.clearrect(0, 0, canvas.width, canvas.height);
//设置原点
context.translate(canvas.width * 0.5, canvas.height * 0.5);
//旋转角度
context.rotate(angle);
//设置填充颜色
context.fillstyle = "#ff0000";
//绘制矩形
context.fillrect(-30, -30, 60, 60);
angle += 0.05 * math.pi;
}
finally{
context.restore();
}
}
$(window).bind("resize",resetcanvas).bind("reorient",resetcanvas);
$(document).ready(function(){
window.scrollto(0,1);
resetcanvas();
setinterval(animate,40);
});
})();