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非常漂亮的立体旋转的花型特效

稿源：互联网 2022-04-02 21:40:59 点击： 2664 撤稿纠错

闲暇时做的一点自娱自乐。基本没有任何实用性，因为仅仅是上面的那点图案，浏览器已经要承担每次变换500个元素的负担。IE8以下的js引擎就已经显得相当吃力了。

以下讨论的是和旋转特效相关的非常漂亮的立体旋转的花型特效教程文章，内容是本站精心挑选整理的教程，希望对广大的网友给到帮助,下面是详细内容：

脚本代码(For Alixixi.com)如下:

<!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();
}
</script></head>
<body>
<div id="screen" class="screen"></div>
</body>
</html>

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