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Javascript实现3D标签云的效果

效果原理(球坐标系): r∈[0,+∞), φ∈[0, 2π], θ∈[0, π] . r = 常数,即以原点为心的球面; θ= 常数,即以原点为顶点、z轴为轴的圆锥面; φ= 常数,即过z轴的半平面。
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('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();
        
        //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);
}
html
<div id="div1">
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 css
#div1 {position:relative; width:450px; height:450px; margin: 20px auto 0; }
#div1 a {position:absolute; top:0px; left:0px; font-family: Microsoft YaHei; color:#fff; font-weight:bold; text-decoration:none; padding: 3px 6px; }
#div1 a:hover {border: 1px solid #eee; background: #000; }
#div1 .blue {color:blue;}
#div1 .red {color:red;}
#div1 .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; }


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