js关键字球状旋转效果js代码

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以下是 js关键字球状旋转效果js代码的示例演示效果:

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部分效果截图:

HTML代码(index.html):

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>js�ؼ�����״��תЧ��</title>
<link rel="stylesheet" href="css/style.css" />
<script type="text/javascript" src="js/zzsc.js"></script>
</head>
<body>
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<div id="div1">
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</div>
</body>
</html>

JS代码(zzsc.js):

var radius = 150;
	var dtr = Math.PI/180;
	var d=300;
	var mcList = [];
	var active = false;
	var lasta = 1;
	var lastb = 1;
	var distr = true;
	var tspeed=2;
	var size=250;
	var mouseX=0;
	var mouseY=0;
	var howElliptical=1;
	var aA=null;
	var oDiv=null;
	window.onload=function (){
	var i=0;
	var oTag=null;
	oDiv=document.getElementById('div1');
	aA=oDiv.getElementsByTagName('a');
	for(i=0;
	i<aA.length;
	i++){
	oTag={
}
;
	oTag.offsetWidth=aA[i].offsetWidth;
	oTag.offsetHeight=aA[i].offsetHeight;
	mcList.push(oTag);
}
sineCosine( 0,0,0 );
	positionAll();
	oDiv.onmouseover=function (){
	active=true;
}
;
	oDiv.onmouseout=function (){
	active=false;
}
;
	oDiv.onmousemove=function (ev){
	var oEvent=window.event || ev;
	mouseX=oEvent.clientX-(oDiv.offsetLeft+oDiv.offsetWidth/2);
	mouseY=oEvent.clientY-(oDiv.offsetTop+oDiv.offsetHeight/2);
	mouseX/=5;
	mouseY/=5;
}
;
	setInterval(update,30);
}
;
	function update(){
	var a;
	var b;
	if(active){
	a = (-Math.min( Math.max( -mouseY,-size ),size ) / radius ) * tspeed;
	b = (Math.min( Math.max( -mouseX,-size ),size ) / radius ) * tspeed;
}
else{
	a = lasta * 0.98;
	b = lastb * 0.98;
}
lasta=a;
	lastb=b;
	if(Math.abs(a)<=0.01 && Math.abs(b)<=0.01){
	return;
}
var c=0;
	sineCosine(a,b,c);
	for(var j=0;
	j<mcList.length;
	j++){
	var rx1=mcList[j].cx;
	var ry1=mcList[j].cy*ca+mcList[j].cz*(-sa);
	var rz1=mcList[j].cy*sa+mcList[j].cz*ca;
	var rx2=rx1*cb+rz1*sb;
	var ry2=ry1;
	var rz2=rx1*(-sb)+rz1*cb;
	var rx3=rx2*cc+ry2*(-sc);
	var ry3=rx2*sc+ry2*cc;
	var rz3=rz2;
	mcList[j].cx=rx3;
	mcList[j].cy=ry3;
	mcList[j].cz=rz3;
	per=d/(d+rz3);
	mcList[j].x=(howElliptical*rx3*per)-(howElliptical*2);
	mcList[j].y=ry3*per;
	mcList[j].scale=per;
	mcList[j].alpha=per;
	mcList[j].alpha=(mcList[j].alpha-0.6)*(10/6);
}
doPosition();
	depthSort();
}
function depthSort(){
	var i=0;
	var aTmp=[];
	for(i=0;
	i<aA.length;
	i++){
	aTmp.push(aA[i]);
}
aTmp.sort(function (vItem1,vItem2){
	if(vItem1.cz>vItem2.cz){
	return -1;
}
else if(vItem1.cz<vItem2.cz){
	return 1;
}
else{
	return 0;
}
}
);
	for(i=0;
	i<aTmp.length;
	i++){
	aTmp[i].style.zIndex=i;
}
}
function positionAll(){
	var phi=0;
	var theta=0;
	var max=mcList.length;
	var i=0;
	var aTmp=[];
	var oFragment=document.createDocumentFragment();
	//�������for(i=0;
	i<aA.length;
	i++){
	aTmp.push(aA[i]);
}
aTmp.sort(function (){
	return Math.random()<0.5?1:-1;
}
);
	for(i=0;
	i<aTmp.length;
	i++){
	oFragment.appendChild(aTmp[i]);
}
oDiv.appendChild(oFragment);
	for( var i=1;
	i<max+1;
	i++){
	if( distr ){
	phi = Math.acos(-1+(2*i-1)/max);
	theta = Math.sqrt(max*Math.PI)*phi;
}
else{
	phi = Math.random()*(Math.PI);
	theta = Math.random()*(2*Math.PI);
}
//����任mcList[i-1].cx = radius * Math.cos(theta)*Math.sin(phi);
	mcList[i-1].cy = radius * Math.sin(theta)*Math.sin(phi);
	mcList[i-1].cz = radius * Math.cos(phi);
	aA[i-1].style.left=mcList[i-1].cx+oDiv.offsetWidth/2-mcList[i-1].offsetWidth/2+'px';
	aA[i-1].style.top=mcList[i-1].cy+oDiv.offsetHeight/2-mcList[i-1].offsetHeight/2+'px';
}
}
function doPosition(){
	var l=oDiv.offsetWidth/2;
	var t=oDiv.offsetHeight/2;
	for(var i=0;
	i<mcList.length;
	i++){
	aA[i].style.left=mcList[i].cx+l-mcList[i].offsetWidth/2+'px';
	aA[i].style.top=mcList[i].cy+t-mcList[i].offsetHeight/2+'px';
	aA[i].style.fontSize=Math.ceil(12*mcList[i].scale/2)+8+'px';
	aA[i].style.filter="alpha(opacity="+100*mcList[i].alpha+")";
	aA[i].style.opacity=mcList[i].alpha;
}
}
function sineCosine( a,b,c){
	sa = Math.sin(a * dtr);
	ca = Math.cos(a * dtr);
	sb = Math.sin(b * dtr);
	cb = Math.cos(b * dtr);
	sc = Math.sin(c * dtr);
	cc = Math.cos(c * dtr);
}

CSS代码(style.css):

body{background:#09c;}
#div1{height:400px;width:450px;position:relative;margin:10px auto;}
#div1 a{position:absolute;top:0px;left:0px;color:#fff;font-weight:bold;padding:3px 6px;}
#div1 a:hover{border:1px solid #eee;background:#000;border-radius:5px;}

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