3D 球状标签云的效果想必很多朋友在浏览网页时都有见到过吧,看起来提复杂的,其实实现起来挺容易的,感兴趣的朋友可以了解下本文
Javascript 是一种由 Netscape 的 LiveScript 发展而来的原型化继承的基于对象的动态类型的区分大小写的客户端脚本语言,主要目的是为了解决服务器端语言,比如 Perl,遗留的速度问题,为客户提供更流畅的浏览效果。
Javascript 代码段
- var radius = 120; //旋转半径;
- 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);
- }
CSS 代码段
- body {
- background: #000 url(index.png) no - repeat center 230px;
- }#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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