用JS实现3D球状标签云示例代码

  Matter:

  1、发现实例不足,无法悬停(有待解决)

  2、无法系统随机自动上色(有待解决)

  首先使用标签云的一家高知名度的网站---照片共享网站Flickr。标签云的设计者是交互设计师Stewart Butterfield。之后,标签云被诸如del、Technorati等网站采纳。

  首次公布的外观标签云(或至少是一个加权名单),可归结起来主要是"潜意识档案" ,在 Douglas Coupland的Microserfs( 1995 ) 。在Lester Leaps Out,威尔士诗人朗道,使用同样的逻辑加权文本,以创造一个图形文字地图来描述爵士音乐。诗中出现在他的书《Magic Fire Chevrolet》中( 1980 ) 。

  html代码段

  

复制代码 代码如下:

  <!DOCTYPE html>

  <html>

  <headers>

  <meta charset=utf-8 />

  <title>3D球状标签</title>

  <link rel="stylesheet" type="text/css" href="3Dtag_style.css" />

  <script type="text/javascript" src="3Dtag.js"></script>

  </headers>

  <body>

  <div id="div1">

  <a href="#">水果类别</a>

  <a href="#" class="red">苹果</a>

  <a href="#">香蕉</a>

  <a href="#">西瓜</a>

  <a href="#" class="blue">3Dtag</a>

  <a href="#">SEO</a>

  <a href="#">火龙果</a>

  <a href="#" class="yellow">梨</a>

  <a href="#">球状</a>

  <a href="#" class="red">CSS</a>

  <a href="#">PHP</a>

  <a href="#" class="blue">Java</a>

  <a href="#">继承</a>

  <a href="#">C#</a>

  <a href="#" class="blue">OOP</a>

  <a href="#">语言类别</a>

  <a href="#" class="blue">西红柿</a>

  <a href="#">C++</a>

  <a href="#">C</a>

  <a href="#">番茄</a>

  <a href="#">demo</a>

  </div>

  <p>3D球状tag</p>

  </body></html>

  Javascript代码段

  

复制代码 代码如下:

  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

  

复制代码 代码如下:

  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; }