娱乐型的圆形立体翻转特效-JS特效-爱易网页

娱乐型的圆形立体翻转特效

日期：2014-05-18　浏览次数：20150 次

以下是程序代码

<!doctype html>
<html>
<head>
<title>mathematic is so beautifull!</title>
<meta name="author" content="hongru.chen" />
<style type="text/css">
html {overflow:hidden}
body, .screen {background:#000; overflow:hidden; width:100%; height:100%; position:absolute; margin:0; padding:0}
#screen {left:0; top:0; zoom:1}
#screen span {position:absolute; font-size:0; line-height:0; overflow:hidden}
</style>
  <script type="text/javascript">
var BeautifullMath = function () {
var obj = [], xm = 0, ym = 0, axe = 0, aye = 0, parts = 500, scr, txe, tye, nw, nh;
var addEvent = function (o, e, f) {
window.addEventListener ? o.addEventListener(e, f, false) : o.attachEvent('on'+e, function(){f.call(e)})
}
var resize = function () {
nw = scr.offsetWidth * .5;
nh = scr.offsetHeight * .5;
}
var init = function (n, f) {
if(!!n) parts = n;
scr = document.getElementById('screen');
addEvent(document, 'mousemove', function(e){
e = e || window.event;
xm = e.clientX;
ym = e.clientY;
});
resize();
addEvent(window, 'resize', resize);
__init(f);
setInterval(run, 16);
}
var __init = function (f) {
for (var i=0; i<parts; i++) {
var o = {};
o.p = document.createElement('span');
scr.appendChild(o.p);
var r = i/parts, j, a, b;
j = i % (parts * .5);
a = Math.floor(j)/200+(Math.floor(j/2)%10)/5* Math.PI * 2;
b = Math.acos(-0.9+(j%4)*0.6);
r = !!f?f(r):r-r*r+.5;
var sbr = Math.sin(b) * r;
o.x = Math.sin(a) * sbr;
o.y = Math.cos(a) * sbr;
o.z = Math.cos(b) * r;
obj.push(o);
o.transform = function () {
var ax = .02 * txe,
ay = .02 * tye,
cx = Math.cos(ax),
sx = Math.sin(ax),
cy = Math.cos(ay),
sy = Math.sin(ay);
//rotation
var z = this.y * sx + this.z * cx;
this.y = this.y * cx + this.z * -sx;
this.z = this.x * -sy + z * cy;
this.x = this.x * cy + z * sy;
//3d
var scale = 1 / (1 + this.z),
x = this.x * scale * nh + nw - scale * 2,
y = this.y * scale * nh + nh - scale * 2;
//set style
var p = this.p.style;
if (x >= 0 && y >=0 && x < nw * 2 && y < nh * 2) {
var c = Math.round(256 + (-this.z * 256));
p.left = Math.round(x) + 'px';
p.top = Math.round(y) + 'px';
p.width = Math.round(scale * 2) + 'px';
p.height = Math.round(scale * 2) + 'px';
p.background = 'rgb('.concat((c),',',(c),',',(1024-c),')');
p.zIndex = 200 + Math.floor(-this.z * 100);
} else p.width = "0px";
}
}
}
//run function 
var run = function () {
var se = 1 / nh;
txe = (ym - axe) * se;
tye = (xm - aye) * se;
axe += txe;
aye += tye;
/* ---- anim particles ---- */
for (var i = 0, o; o = obj[i]; i++) o.transform();
}
return {init:init}
}();
onload = function () {
BeautifullMath.init(500, function(r){
return r=.5
});
}
</script></head>
<body>
<div id="screen" class="screen"></div>
</body>
</html>

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