不到200行代码实现一个不断旋转的椭圆动画效果
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不到200行代码实现一个不断旋转的椭圆动画效果
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源代碼：
<html><head><script src="jQuery/jscex.jscexRequire.min.js" type="text/javascript"></script></head><body><style type="text/css">input.css3btn{background: -moz-linear-gradient(270deg, #d2ebf8, #0c8ab5);background: -webkit-linear-gradient(top, #d2ebf8, #0c8ab5);background: -o-linear-gradient(top, #d2ebf8, #0c8ab5);filter: progid:DXImageTransform.Microsoft.Gradient(GradientType=0, StartColorStr='#000099CC', EndColorStr='#FF0087B4');border-top: 1px solid #38538c;border-right: 1px solid #1f2d4d;border-bottom: 1px solid #151e33;border-left: 1px solid #1f2d4d;border-radius: 4px;box-shadow: inset 0 1px 10px 1px #5c8bee, 0px 1px 0 #1d2c4d, 0 2px 0px #1f3053, 0 4px 4px 1px #111111;color: #f0f0f0;font: bold 20px "helvetica neue" , helvetica, arial, sans-serif;padding: 10px 0 10px 0;text-align: center;text-shadow: 0px -1px 1px #1e2d4d;width: 150px;background-clip: padding-box;}input.css3btn:hover{box-shadow: inset 0 0px 20px 1px #87adff, 0px 1px 0 #1d2c4d, 0 3px 0px #1f3053, 0 4px 4px 1px #111111;cursor: pointer;}input.css3btn:active{box-shadow: inset 0 1px 10px 1px #5c8bee, 0 1px 0 #1d2c4d, 0 2px 0 #1f3053, 0 4px 3px 0 #111111;margin-top: 1px;}</style><canvas id="myCanvas2" width="350" height="350" style="border: solid 15px #222; background-color: #111; color: #CCC;">Your browser does not support the canvas element.</canvas><script>var canvas;var ctx;var px = 0;var py = 0;function init() {canvas = document.getElementById("myCanvas2");ctx = canvas.getContext("2d");ctx.strokeStyle = "#fff";ctx.translate(70, 70);}init();var i = 0;function drawEllipse(x, y, w, h) {ctx.clearRect(-canvas.width, -canvas.height, 2 * canvas.width, 2 * canvas.height);var k = 0.5522848;var ox = (w / 2) * k;var oy = (h / 2) * k;var xe = x + w;var ye = y + h;var xm = x + w / 2;var ym = y + h / 2;ctx.beginPath();ctx.moveTo(x, ym);ctx.bezierCurveTo(x, ym - oy, xm - ox, y, xm, y);ctx.bezierCurveTo(xm + ox, y, xe, ym - oy, xe, ym);ctx.bezierCurveTo(xe, ym + oy, xm + ox, ye, xm, ye);ctx.bezierCurveTo(xm - ox, ye, x, ym + oy, x, ym);ctx.stroke();ctx.translate(x + 70, y + 100);px = -70;py = -100;ctx.rotate(10 * Math.PI * 2 / 360);}var ct;var drawAsync = eval(Jscex.compile("async", function (ct) {while (true) {drawEllipse(px, py, 140, 200)$await(Jscex.Async.sleep(200, ct));}}))function Button1_onclick() {ct.cancel();}function Button2_onclick() {ct = new Jscex.Async.CancellationToken();drawAsync(ct).start();}</script><br /><input id="Button2" class="css3btn" type="button" value="run" onclick="return Button2_onclick()" /><input id="Button1" class="css3btn" type="button" value="stop" onclick="return Button1_onclick()" /></body></html>效果：
點stop可以停止旋轉的動畫效果：
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