DDR爱好者之家

深入解析JS实现3D标签云的原理与方法
站长资源 2025/10/26 佚名
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DDR爱好者之家 Design By 杰米

本文实例讲述了深入解析JS实现3D标签云的原理与方法。分享给大家供大家参考，具体如下：

最近开始用canvas搞3D了，搞得也是简单的东西，就是球体转圈。做出来后，突然想起以前看过的3D标签云，在以前觉得真心狂拽酷炫叼啊，当时也确实不知道怎么在平面上模拟3D，所以也就没去搞了。现在刚好用了canvas搞3D，也发现，好像3D标签云也差不多，然后就写了一下。

具体怎么做呢，先说一下原理，3D标签云就是做一个球面，然后再球面上取均匀分布的点，把点坐标赋给标签，再根据抽象出来的Z轴大小来改变标签的字体大小，透明度，做出立体感觉，然后球体就做好了。关键代码就下面这几句：

function innit(){
  for(var i=0;i<tagEle.length;i++){
    var a , b;
    var k = -1+(2*(i+1)-1)/tagEle.length;
    var a = Math.acos(k);
    var b = a*Math.sqrt(tagEle.length*Math.PI);
    // var a = Math.random()*2*Math.PI;
    // var b = Math.random()*2*Math.PI;
    var x = RADIUS * Math.sin(a) * Math.cos(b);
    var y = RADIUS * Math.sin(a) * Math.sin(b); 
    var z = RADIUS * Math.cos(a);
    var t = new tag(tagEle[i] , x , y , z);
    tagEle[i].style.color = "rgb("+parseInt(Math.random()*255)+","+parseInt(Math.random()*255)+","+parseInt(Math.random()*255)+")";
    tags.push(t);
    t.move();
  }
}

上面的代码是用于生成球面上的点的x,y,z轴的坐标。用到的就是简单的球面方程：已知半径r和球心，一般为了方便，我们都以坐标轴原点为球心，有下面三个方程

　x=r*sinθ*cosΦ   y=r*sinθ*sinΦ   z=r*cosθ;

也就是说，我们可以对θ和Φ取随机数，来获得圆上的随机点坐标。但仅此还不够，因为如果要做3D标签云，一个很重要点的就是平均分布。如果单纯的取随机坐标，会导致一些标签重叠，相对来说就没那么美观了。所以我们引入第二个公式：

θ = arccos( ((2*num)-1)/all - 1);
Φ = θ*sqrt(all * π);

num是当前第几个点，all则是点的总数。这个公式的是我在别人的代码里找到的，我也不懂原理。不过确实好用。

有了上面两个公式以后，我们就可以获得球面上所需要的平均分布的点。然后再对每个标签进行操作：

var scale = fallLength/(fallLength-this.z);
var alpha = (this.z+RADIUS)/(2*RADIUS);
this.ele.style.fontSize = 15 * scale + "px";
this.ele.style.opacity = alpha+0.5;
this.ele.style.filter = "alpha(opacity = "+(alpha+0.5)*100+")";
this.ele.style.zIndex = parseInt(scale*100);
this.ele.style.left = this.x + CX - this.ele.offsetWidth/2 +"px";
this.ele.style.top = this.y + CY - this.ele.offsetHeight/2 +"px";

fallLength是焦距，也就是一个常量，scale和alpha都是要根据z轴来调整的比例。后面的属性操作就比较简单了，调整一下字体大小，透明度，以及元素位置，球体就做出来了，效果如下（忽略字的内容，乱写的）：

深入解析JS实现3D标签云的原理与方法

球体做出来了，是时候让其动起来了。这时就引入第三个公式了，矩阵旋转算法:

深入解析JS实现3D标签云的原理与方法

还可以直接戳 计算机图形学3D变换；

然后，我们就可以写出两个函数，一个是绕X轴旋转，一个是绕Y轴旋转。

function rotateX(){
  var cos = Math.cos(angleX);
  var sin = Math.sin(angleX);
  tags.forEach(function(){
    var y1 = this.y * cos - this.z * sin;
    var z1 = this.z * cos + this.y * sin;
    this.y = y1;
    this.z = z1;
  })
  
}
function rotateY(){
  var cos = Math.cos(angleY);
  var sin = Math.sin(angleY);
  tags.forEach(function(){
    var x1 = this.x * cos - this.z * sin;
    var z1 = this.z * cos + this.x * sin;
    this.x = x1;
    this.z = z1;
  })
}

然后就可以通过控制angleX和angleY两个角度的值来控制标签云的旋转方向以及旋转速度，角度的正负值控制旋转方向，大小控制旋转速度。

接下来就可以用鼠标事件来控制了：

if("addEventListener" in window){
  paper.addEventListener("mousemove" , function(event){
    var x = event.clientX - EX - CX;
    var y = event.clientY - EY - CY;
    // angleY = -x* (Math.sqrt(Math.pow(x , 2) + Math.pow(y , 2)) > RADIUS/4 "onmousemove" , function(event){
    var x = event.clientX - EX - CX;
    var y = event.clientY - EY - CY;
    angleY = x*0.0001;
    angleX = y*0.0001;
  });
}

当这个也写好后，3D标签云就算完工了，完成效果就直接看DEMO吧：3D标签云；

下面贴出标签云的所有代码，其实都可以通过控制台看代码，不过还是贴一下吧：（本人技术不是很好，代码写的不好请见谅）

<!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" xml:lang="en">
<head>
  <meta http-equiv="Content-Type" content="text/html;charset=UTF-8">
  <style>
    .tagBall{
      width: 800px;
      height: 800px;
      margin:50px auto;
      position: relative;
    }
    .tag{
      display: block;
      position: absolute;
      left: 0px;
      top: 0px;
      color: #000;
      text-decoration: none;
      font-size: 15px;
      font-family: "微软雅黑";
      font-weight: bold;
    }
    .tag:hover{border:1px solid #666;}
  </style>
  <title>3D标签</title>
</head>
<body>
  <div class="tagBall">
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    <a class="tag" target="_blank" href="http://2.axescanvas.sinaapp.com/LoveDemo/secondLove.html" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >我喜欢你</a>
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    <a class="tag" target="_blank" href="http://2.axescanvas.sinaapp.com/LoveDemo/secondLove.html" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >我喜欢你</a>
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    <a class="tag" target="_blank" href="http://2.axescanvas.sinaapp.com/LoveDemo/secondLove.html" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >我喜欢你</a>
    <a class="tag" target="_blank" href="http://2.axescanvas.sinaapp.com/LoveDemo/secondLove.html" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >某某某</a>
    <a class="tag" target="_blank" href="http://2.axescanvas.sinaapp.com/LoveDemo/secondLove.html" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >我喜欢你</a>
    <a class="tag" target="_blank" href="http://2.axescanvas.sinaapp.com/LoveDemo/secondLove.html" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >某某某</a>
    <a class="tag" target="_blank" href="http://2.axescanvas.sinaapp.com/LoveDemo/secondLove.html" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >我喜欢你</a>
    <a class="tag" target="_blank" href="http://2.axescanvas.sinaapp.com/LoveDemo/secondLove.html" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >我喜欢你</a>
    <a class="tag" target="_blank" href="http://2.axescanvas.sinaapp.com/LoveDemo/secondLove.html" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >某某某</a>
    <a class="tag" target="_blank" href="http://2.axescanvas.sinaapp.com/LoveDemo/secondLove.html" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >我喜欢你</a>
  </div>
  <script>
    var tagEle = "querySelectorAll" in document ".tag") : getClass("tag"),
      paper = "querySelectorAll" in document ".tagBall") : getClass("tagBall")[0];
      RADIUS =300,
      fallLength = 500,
      tags=[],
      angleX = Math.PI/500,
      angleY = Math.PI/500,
      CX = paper.offsetWidth/2,
      CY = paper.offsetHeight/2,
      EX = paper.offsetLeft + document.body.scrollLeft + document.documentElement.scrollLeft,
      EY = paper.offsetTop + document.body.scrollTop + document.documentElement.scrollTop;
    function getClass(className){
      var ele = document.getElementsByTagName("*");
      var classEle = [];
      for(var i=0;i<ele.length;i++){
        var cn = ele[i].className;
        if(cn === className){
          classEle.push(ele[i]);
        }
      }
      return classEle;
    }
    function innit(){
      for(var i=0;i<tagEle.length;i++){
        var a , b;
        var k = (2*(i+1)-1)/tagEle.length - 1;
        var a = Math.acos(k);
        var b = a*Math.sqrt(tagEle.length*Math.PI);
        // var a = Math.random()*2*Math.PI;
        // var b = Math.random()*2*Math.PI;
        var x = RADIUS * Math.sin(a) * Math.cos(b);
        var y = RADIUS * Math.sin(a) * Math.sin(b); 
        var z = RADIUS * Math.cos(a);
        var t = new tag(tagEle[i] , x , y , z);
        tagEle[i].style.color = "rgb("+parseInt(Math.random()*255)+","+parseInt(Math.random()*255)+","+parseInt(Math.random()*255)+")";
        tags.push(t);
        t.move();
      }
    }
    Array.prototype.forEach = function(callback){
      for(var i=0;i<this.length;i++){
        callback.call(this[i]);
      }
    }
    function animate(){
      setInterval(function(){
        rotateX();
        rotateY();
        tags.forEach(function(){
          this.move();
        })
      } , 17)
    }
    if("addEventListener" in window){
      paper.addEventListener("mousemove" , function(event){
        var x = event.clientX - EX - CX;
        var y = event.clientY - EY - CY;
        // angleY = -x* (Math.sqrt(Math.pow(x , 2) + Math.pow(y , 2)) > RADIUS/4 "onmousemove" , function(event){
        var x = event.clientX - EX - CX;
        var y = event.clientY - EY - CY;
        angleY = x*0.0001;
        angleX = y*0.0001;
      });
    }
    function rotateX(){
      var cos = Math.cos(angleX);
      var sin = Math.sin(angleX);
      tags.forEach(function(){
        var y1 = this.y * cos - this.z * sin;
        var z1 = this.z * cos + this.y * sin;
        this.y = y1;
        this.z = z1;
      })
    }
    function rotateY(){
      var cos = Math.cos(angleY);
      var sin = Math.sin(angleY);
      tags.forEach(function(){
        var x1 = this.x * cos - this.z * sin;
        var z1 = this.z * cos + this.x * sin;
        this.x = x1;
        this.z = z1;
      })
    }
    var tag = function(ele , x , y , z){
      this.ele = ele;
      this.x = x;
      this.y = y;
      this.z = z;
    }
    tag.prototype = {
      move:function(){
        var scale = fallLength/(fallLength-this.z);
        var alpha = (this.z+RADIUS)/(2*RADIUS);
        this.ele.style.fontSize = 15 * scale + "px";
        this.ele.style.opacity = alpha+0.5;
        this.ele.style.filter = "alpha(opacity = "+(alpha+0.5)*100+")";
        this.ele.style.zIndex = parseInt(scale*100);
        this.ele.style.left = this.x + CX - this.ele.offsetWidth/2 +"px";
        this.ele.style.top = this.y + CY - this.ele.offsetHeight/2 +"px";
      }
    }
    innit();
    animate();
  </script>
</body>
</html>

或者直接看github源码：

https://github.com/whxaxes/canvas-test/blob/gh-pages/src/3D-demo/3Dtag.html

更多关于JavaScript相关内容感兴趣的读者可查看本站专题：《JavaScript切换特效与技巧总结》、《JavaScript查找算法技巧总结》、《JavaScript动画特效与技巧汇总》、《JavaScript错误与调试技巧总结》、《JavaScript数据结构与算法技巧总结》及《JavaScript数学运算用法总结》

希望本文所述对大家JavaScript程序设计有所帮助。

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