Example of circular floating tag cloud effect implemented by JavaScript

Example of circular floating tag cloud effect implemented by JavaScript_javascript skills

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Release： 2016-05-16 15:46:55

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The example in this article describes the circular floating tag cloud effect implemented by JavaScript. Share it with everyone for your reference. The details are as follows:

The JS tag cloud effect introduced here will automatically rotate under the action of the mouse, forming a circle as a whole. There is no Div code between each tag. In the form of direct text links, as many as there are will be displayed. JavaScript will Automatically adjust the display quantity to achieve the best visual effect.

The operation effect is as shown below:

The specific code is as follows:

<!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关键字球状旋转效果</title>
<style>
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;}
</style>
<script type="text/javascript">
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();
 //随机排序
 for(i=0;i<aA.length;i++)
 {
  aTmp.push(aA[i]);
 }
 aTmp.sort
 (
  function ()
  {
   return Math.random()<0.5&#63;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>
<!-- 代码开始 --> 
<div id="div1">
<a href="#" target="_blank">起名取名</a>
<a href="#" target="_blank">宣传策划</a>
<a href="#" target="_blank">网游试玩</a>
<a href="#" target="_blank">短信表白</a>
<a href="#" target="_blank">外语翻译</a>
<a href="#" target="_blank">产品推广</a>
<a href="#" target="_blank">网络营销</a>
<a href="#" target="_blank">动漫设计</a>
<a href="#" target="_blank">招聘求职</a>
<a href="#" target="_blank">家居装修</a>
<a href="#" target="_blank">影视创作</a>
<a href="#" target="_blank">照片美化</a>
<a href="#" target="_blank">产品设计</a>
<a href="#" target="_blank">包装设计</a>
<a href="#" target="_blank">Logo设计</a>
<a href="#" target="_blank">海报设计</a>
<a href="#" target="_blank">程序开发</a>
<a href="#" target="_blank">网站开发</a>
<a href="#" target="_blank">配音配词</a>
<a href="#" target="_blank">产品推广</a>
<a href="#" target="_blank">网络营销</a>
<a href="#" target="_blank">动漫设计</a>
<a href="#" target="_blank">家居装修</a>
<a href="#" target="_blank">影视创作</a>
<a href="#" target="_blank">照片美化</a>
</div>
<!-- 代码结束 -->
<div style="text-align:center;clear:both">
<p>适用浏览器：IE8、360、FireFox、Chrome、Safari、Opera、傲游、搜狗、世界之窗. </p>
</div>
</body>
</html>

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I hope this article will be helpful to everyone’s JavaScript programming design.