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酷炫Html5旋转代码【转】

2024-04-27 14:27:26
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酷炫Html5旋转代码【转】
<!DOCTYPE html><html>  <head>    <meta charset='utf-8' />    <!-- js引用包 -->    <script src='http://libs.baidu.com/jquery/1.9.0/jquery.min.js'></script><style>> body {    margin: 0;    overflow: hidden}div {    padding: 1px 5px;    background: #333;    position: absolute;    z - index: 2;    color: #555;    font - family: arial}a {    color: #ccf}a: hover {    color: red}</style> <script>window.onload = function() {    C = Math.cos;    S = Math.sin;    U = 0;    w = window;    j = document;    d = j.getElementById("kele" + "yi_com");    c = d.getContext("2d");    W = d.width = w.innerWidth;    H = d.height = w.innerHeight;    c.fillRect(0, 0, W, H);    c.globalCompositeOperation = "lighter";    c.lineWidth = 0.2;    c.lineCap = "round";    var bool = 0,    t = 0;    d.onmousemove = function(e) {        if (window.T) {            if (D == 9) {                D = Math.random() * 15;                f(1);            }            clearTimeout(T);        }        X = e.pageX;        Y = e.pageY;        a = 0;        b = 0;        A = X,        B = Y;        R = (e.pageX / W * 999 >> 0) / 999;        r = (e.pageY / H * 999 >> 0) / 999;        U = e.pageX / H * 360 >> 0;        D = 9;        g = 360 * Math.PI / 180;        T = setInterval(f = function(e) {            c.save();            c.globalCompositeOperation = "source-over";            if (e != 1) {                c.fillStyle = "rgba(0,0,0,0.02)";                c.fillRect(0, 0, W, H);            }            c.restore();            i = 25;            while (i--) {                c.beginPath();                if (D > 450 || bool) {                    if (!bool) {                        bool = 1;                    }                    if (D < 0.1) {                        bool = 0;                    }                    t -= g;                    D -= 0.1;                }                if (!bool) {                    t += g;                    D += 0.1;                }                q = (R / r - 1) * t;                x = (R - r) * C(t) + D * C(q) + (A + (X - A) * (i / 25)) + (r - R);                y = (R - r) * S(t) - D * S(q) + (B + (Y - B) * (i / 25));                if (a) {                    c.moveTo(a, b);                    c.lineTo(x, y)                }                c.strokeStyle = "hsla(" + (U % 360) + ",100%,50%,0.75)";                c.stroke();                a = x;                b = y;            }            U -= 0.5;            A = X;            B = Y;        },        16);    }    j.onkeydown = function(e) {        a = b = 0;        R += 0.05    }    d.onmousemove({        pageX: 300,        pageY: 290    })}</script></head>  <body>    <div id="text"></div>      <canvas id="keleyi_com"></canvas>      </body></html>


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