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<html>
<head>
<title>三里屯SOHO商盟</title>
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<meta name="viewport" content="width=device-width, initial-scale=1.0, minimum-scale=1.0, maximum-scale=1.0, user-scalable=no"/>
<meta name="apple-mobile-web-app-status-bar-style" content="black"/>
<meta name="apple-mobile-web-app-title" content=""/>
<meta name="apple-touch-fullscreen" content="YES" />
<meta name="apple-mobile-web-app-capable" content="yes" />
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<meta name="HandheldFriendly" content="true" />
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<link rel="apple-touch-icon-precomposed" sizes="144x144" href="" />
<link href="assets/css/reset.css" rel="stylesheet" type="text/css">
<link href="assets/css/base.css" rel="stylesheet" type="text/css">
<!--feature-->
<link href="assets/css/index.css" rel="stylesheet" type="text/css">
<style type="text/css">
</style>
</head>
<body>
<section class="doc doc--bg2" style="width: 400px;height: 400px;margin: 0 auto;border-radius: 400px;position: relative;border:1px#efefef solid;overflow: hidden;">
<canvas id="canvas" style="position:absolute;top:0px;left:0px;z-index:1;"></canvas>
</section>
<script type="text/javascript">
var canvas = document.getElementById('canvas');
var ctx = canvas.getContext('2d');
canvas.width = canvas.parentNode.offsetWidth;
canvas.height = canvas.parentNode.offsetHeight;
//如果浏览器支持requestAnimFrame则使用requestAnimFrame否则使用setTimeout
window.requestAnimFrame = (function(){
return window.requestAnimationFrame ||
window.webkitRequestAnimationFrame ||
window.mozRequestAnimationFrame ||
function( callback ){
window.setTimeout(callback, 1000 / 60);
};
})();
//初始角度为0
var step = 0;
//定义三条不同波浪的颜色
var lines = ["rgba(0,222,255, 0.2)",
"rgba(157,192,249, 0.2)",
"rgba(0,168,255, 0.2)"];
function loop(){
ctx.clearRect(0,0,canvas.width,canvas.height);
step++;
//画3个不同颜色的矩形
for(var j = lines.length - 1; j >= 0; j--) {
ctx.fillStyle = lines[j];
//每个矩形的角度都不同，每个之间相差45度
var angle = (step+j*45)*Math.PI/180;
var deltaHeight = Math.sin(angle) * 50;
var deltaHeightRight = Math.cos(angle) * 50;
ctx.beginPath();
ctx.moveTo(0, canvas.height/2+deltaHeight);
ctx.bezierCurveTo(canvas.width /2, canvas.height/2+deltaHeight-50, canvas.width / 2, canvas.height/2+deltaHeightRight-50, canvas.width, canvas.height/2+deltaHeightRight);
ctx.lineTo(canvas.width, canvas.height);
ctx.lineTo(0, canvas.height);
ctx.lineTo(0, canvas.height/2+deltaHeight);
ctx.closePath();
ctx.fill();
}
requestAnimFrame(loop);
}
loop();
</script>
</body>
</html>
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