js实现鼠标感应3D效果桌面球标签云特效

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js实现鼠标感应3D效果桌面球标签云特效

2016-11-16 网页编程网 网页编程网

<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>网页特效 js实现3D球面标签云特效</title>
<style type="text/css">
body {background: #000 url(/img/20101020zzjs.png) no-repeat center 230px;}
#wwwNet {position:relative; width:450px; height:450px; margin: 20px auto 0; }
#wwwNet a {position:absolute; top:0px; left:0px; font-family: Microsoft YaHei; color:#fff; font-weight:bold; text-decoration:none; padding: 3px 6px; }
#wwwNet a:hover {border: 1px solid #eee; background: #000; }
#wwwNet .blue {color:blue;}
#wwwNet .red {color:red;}
#wwwNet .yellow {color:yellow;}
p { font: 16px Microsoft YaHei; text-align: center; color: #ba0c0c; }
p a { font-size: 14px; color: #ba0c0c; }
p a:hover { color: red; }
</style>
<script type="text/javascript">
var radius = 120;
var dtr = Math.PI/180;
var d=300;

var mcList = [];
var active = false;
var lasta = 1;
var lastb = 1;
var distr = true;
var tspeed=10;
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('wwwNet');
	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();
	//随机排序
	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);
		}
		//坐标变换
		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);
}
</script>
</head>
<body>
<div id="wwwNet">
	<a href="http://#/html/tag/%e6%a3%80%e6%b5%8b">检测</a>
	<a href="http://#/html/tag/%e5%af%86%e7%a0%81%e5%bc%ba%e5%ba%a6" class="red">密码强度</a>
	<a href="http://#/html/tag/%e9%80%89%e9%a1%b9%e5%8d%a1">选项卡</a>
	<a href="http://#/html/tag/%e5%ae%9a%e4%bd%8d">定位</a>
	<a href="http://#/html/tag/%e5%af%bc%e8%88%aa%e8%8f%9c%e5%8d%95" class="blue">导航菜单</a>
	<a href="http://#/html/tag/%e5%b7%a6%e4%be%a7">左侧</a>
	<a href="http://#/html/tag/%e5%9b%be%e7%89%87%e5%88%87%e6%8d%a2" class="red">图片切换</a>
	<a href="http://#/html/tag/%e8%84%9a%e6%9c%ac" class="yellow">脚本</a>
	<a href="http://#/html/tag/%e6%bb%9a%e5%8a%a8">滚动</a>
	<a href="http://#/html/tag/%e5%b9%bf%e5%91%8a%e4%bb%a3%e7%a0%81" class="red">广告代码</a>
	<a href="http://#/html/tag/%e5%bc%b9%e5%87%ba">弹出</a>
	<a href="http://#/html/tag/%e4%b8%8b%e6%8b%89%e8%8f%9c%e5%8d%95" class="blue">下拉菜单</a>
	<a href="http://#/html/tag/%e5%ae%9a%e6%97%b6">定时</a>
	<a href="http://#/html/tag/%e6%8c%89%e9%92%ae" class="red">按钮</a>
	<a href="http://#/html/tag/%e5%8f%98%e8%89%b2" class="blue">变色</a>
	<a href="http://#/html/tag/%e8%8e%b7%e5%8f%96">获取</a>
	<a href="http://#/html/tag/%e7%82%b9%e5%87%bb" class="blue">点击</a>
	<a href="http://#/html/tag/%e7%94%9f%e6%88%90%e5%99%a8">生成器</a>
	<a href="http://#/html/tag/%e6%8a%95%e7%a5%a8">投票</a>
	<a href="http://#/html/tag/%e6%98%9f%e6%98%9f" class="yellow">星星</a>
	<a href="http://#/html/tag/%e8%bf%90%e8%a1%8c%e4%bb%a3%e7%a0%81">运行代码</a>
</div>
</body>
</html>

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