js模拟3D场景效果

　　这几个demo上星期平安夜做的，感觉效果不错，就放在出来，分享给大家。

　　要在二维空间模拟出三维的效果，就需要把三维的坐标转换成二维坐标。一个最基本依据是：东西越远，看到大小就越小，坐标越往消失点靠拢。

　　透视公式：

　　 scale = fl / (fl + z);

　　 scale是大小的比例值，0.0到1.0之间，fl是观察点到成像面的距离，通常这个值是固定，z就是物件的三维空间中的z轴。

　　在写这些代码之前，我喜欢用面向对象来描述我写的这些东西，比如我需要一个场景，场景是个空间，空间内是可以容纳各种物件的，物件是个对象，物件是是x,y,z三个维度的，场景可以插入任意多的物件，物件就会以它的坐标值，显示在场景的特定位置，由场景来负责物件的显示位置。

　　一些demo，请使用鼠标移动及滚轮来控制。

效果1

<!doctype html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
<title>伪3d透视效果</title>
<style>
html,body{ padding:0px; margin:0px; height:100%; width:100%;overflow:hidden;}
#box{ background:#ccc; height:100%; border:1px solid #ccc;position:relative; overflow:hidden;}
#debug{ width:200px; background:#fff; border:1px solid #ccc; position:absolute; left:10px; top:0px;}
</style>
</head>
<body>
<div id="box">
</div>
<div id="debug"></div>
  <script>
              void function(window){
                  var document = window.document;
                  var debug = document.getElementById('debug');
                  function ObjtoStr(obj){
                      var arr = [];
                      for(var i in obj){
                          if(isNaN(obj[i])) continue;
                          arr.push(i + ':' + obj[i]);
                      }
                      return arr.join('; ');
                  }
                  function getElementOffset(element){
                      var left = 0, top = 0;
                          do{
                              left += element.offsetLeft;
                              top += element.offsetTop;
                          }while(element = element.offsetParent);
                          return {
                              left:left,
                              top:top
                          };
                  }
                  function getMouseOffset(event){
                      return {
                          x:(event.pageX || event.clientX + document.body.scrollLeft - document.body.clientLeft),
                          y:(event.pageY || event.clientY + document.body.scrollTop - document.body.clientTop)
                      };
                  }
                  function addEventListener(element,type,fun){
                      if(element.addEventListener){
                          element.addEventListener(type,function(event){
                              fun(event);
                          },false);
                      }else{
                          element.attachEvent('on'+type,function(){
                              fun(window.event);
                          });
                      }
                  }
                  function extend(subClass,supClass){
                      var fun = function(){},
                          prototype = subClass.prototype;
                      fun.prototype = supClass.prototype;
                      subClass.prototype = new fun();
                      for(var i in prototype){
                          subClass.prototype[i] = prototype[i];
                      }
                      subClass.$supClass = supClass;
                      subClass.prototype.$supClass = function(){
                          var supClass = arguments.callee.caller.$supClass;
                          if(typeof supClass == 'function'){
                               supClass.apply(this,arguments);
                               this.$supClass = supClass;
                          }
                      };
                      subClass.prototype.constructor = subClass;
                      return subClass;
                  }
                  /**
                   * WH类，高宽
                   */
                  function WH(w,h){
                      this.w = w;
                      this.h = h;
                  }
                  WH.prototype = {
                      clone:function(){
                          return new WH(this.w,this.h);
                      }
                  };
                  /**
                   * xyz坐标类
                   * 
                   */
                  function XYZ(x,y,z){
                      this.x = x;
                      this.y = y;
                      this.z = z;
                  }
                  XYZ.prototype = {
                      clone:function(){
                          return new XYZ(this.x,this.y,this.z);
                      }
                  };
                  /**
                   * 场景类
                   */
                  function Scene(options){
                      //属性
                      //dom
                      this.element = null;
                      //场景距离
                      this.fl = 500;
                      this.wh = null;
                      //基准z轴
                      this.baseZ = 0;
                      //中心消失点坐标
                      this.cX = 0;
                      this.cY = 0;
                      //中心消失点便宜
                      this.cXl = 0;
                      this.cYl = 0;
                      //偏移系数
                      this.ce = 1;
                      this.ThingList = [];
                      this.setOption(options);
                      this.init();
                  }
                  Scene.prototype = {
                      setOption:function(options){
                          for(var i in options){
                              switch(i){
                                  case 'element':
                                      this[i] = typeof options[i] == 'string' ? document.getElementById(options[i]) : options[i];
                                      break;
                              }
                          }
                      },
                      init:function(){
                          if(!this.element) throw new Error(90,'not box');
                          this.wh = new WH(this.element.clientWidth,this.element.clientHeight);
                          this.bindEvent();
                      },
                      addThing:function(/* Thing */ thing){
                          this.ThingList.push(thing);
                          this.calcPosition(thing);
                          this.element.appendChild(thing.getElement(this));
                      },
                      //计算位置及大小
                      calcPosition:function(/*Thing*/ thing){
                          this.cX = this.element.clientWidth/2;
                          this.cY = this.element.clientHeight/2;
                          scale = this.fl/(this.fl + thing.xyz.z+this.baseZ);
                          if(scale <= 0){
                              thing.element.style.display = 'none';
                              return ;
                          }else{
                              thing.element.style.display = '';
                          }
                          thing.element.style.width = thing.wh.w * scale + 'px';
                          thing.element.style.height = thing.wh.h * scale + 'px';
                          thing.element.style.top = (this.cY + ((thing.xyz.y+this.cYl-this.cY) * scale)) + 'px';
                          thing.element.style.left = (this.cX + ((thing.xyz.x+this.cXl-this.cX) * scale)) + 'px';
                          thing.element.style.zIndex = Math.round(scale*1000);
                          if(thing.isOpacity){
                              thing.element.style.opacity = Math.min(scale*4.5,1); 
                              thing.element.style.filter = 'alpha(opacity='+(Math.min(scale*4.5,1) * 100)+')';
                          }
                      },
                      bindEvent:function(){
                          var self = this;
                          addEventListener(this.element,'mousemove',function(event){
                              self.onMouseMove(event);
                          });
                          var mousewheel = navigator.userAgent.indexOf('Firefox') > 0 ? 'DOMMouseScroll' : 'mousewheel';
                          addEventListener(this.element,mousewheel,function(event){
                              self.onMouseWheel(event);
                          });
                      },
                      //在场景内移动事件
                      onMouseMove:function(event){
                          //场景的页面坐标
                          var po = getElementOffset(this.element);
                          //鼠标光标的页面坐标
                          var ev = getMouseOffset(event);
                          //场景内坐标
                          var x = ev.x-po.left;
                          var y = ev.y-po.top;
                          //中间消失点的坐标偏移差
                          this.cXl = (this.element.clientWidth/2 - x) * this.ce;
                          this.cYl = (this.element.clientHeight/2 - y) * this.ce;
                          this.reDraw();
                      },
                      onMouseWheel:function(event){
                          var code = event.wheelDelta || -event.detail;
                          if(code > 0){
                              this.baseZ -= 200;
                          }else{
                              this.baseZ += 200;
                          }
                          this.reDraw();
                      },
                      reDraw:function(){
                          for(var i=0 ; i<this.ThingList.length;i++){
                              this.calcPosition(this.ThingList[i]);
                          }
                      }
                  };
                  /**
                   * 物件抽象类
                   */
                  function Thing(options){
                      this.scene = null;
                      this.wh = new WH(10,10);
                      this.xyz = new XYZ(10,10,0);
                      this.element = null;
                      this.isOpacity = true;
                      this.setOption(options);
                      this.init();
                  }
                  Thing.prototype = {
                      setOption:function(options){
                          for(var i in options){
                              switch(i){
                                  case 'wh':
                                  case 'xyz':
                                  case 'isOpacity':
                                      this[i] = options[i];
                                      break;
                                  default:
                                      break;
                              }
                          }
                      },
                      init:function(){
                          this.element = this.draw();
                          this.element.style.position = 'absolute';
                          this.element.style.width = this.wh.w + 'px';
                          this.element.style.height = this.wh.h + 'px';
                      },
                      draw:function(){
                          throw new Error(998,'method do not realize!');
                      },
                      getElement:function(/*Scene*/ scene){
                          this.scene = scene;
                          return this.element;
                      }
                  };
                  function Diam(options){
                      this.$supClass(options);
                  }
                  Diam.prototype = {
                      draw:function(){
                          var img = document.createElement('img');
                          loadimg = img.cloneNode(true);
                          loadimg.onload = function(){
                              self.wh = new WH(this.width,this.height);
                          }
                          img.src = [
                              'http://img18.wal8.com/img18/227468_20111230225028/p16i7nbc3s3bt1dt3naj1p3r1u2e7.jpg',
                              'http://img18.wal8.com/img18/227468_20111230225028/p16i7nbc3sverp2e1j9l8rddbv6.jpg',
                              'http://img18.wal8.com/img18/227468_20111230225028/p16i7nbc3sr3a15f2hd6trl1v632.jpg',
                              'http://img18.wal8.com/img18/227468_20111230225028/p16i7nbc3s4e02mb3j01susuve5.jpg',
                              'http://img18.wal8.com/img18/227468_20111230225028/p16i7nbc3sq8lo6puh5su1m4d4.jpg',
                              'http://img18.wal8.com/img18/227468_20111230225028/p16i7nbc3s15nd1nrf1r8018un7jv3.jpg',
                              'http://img18.wal8.com/img18/227468_20111230225028/p16i7nbc3r2frhoe13gr1k6c11tp1.jpg'
                          ][Math.round(Math.random()*6)];
                          return img;
                      }
                  };
                  extend(Diam,Thing);
                  function Sky(options){
                      this.$supClass(options);
                  }
                  Sky.prototype = {
                      draw:function(){
                          var img = document.createElement('img');
                          img.src = [
                              'http://img18.wal8.com/img18/227468_20111230225028/p16i7ncbsv12991dii1fjbif4esn4.jpg',
                              'http://img18.wal8.com/img18/227468_20111230225028/p16i7ncbsv1652hgn13us1ob410423.jpg',
                              'http://img18.wal8.com/img18/227468_20111230225028/p16i7ncbsv15i55d0meuru3obr2.jpg',
                              'http://img18.wal8.com/img18/227468_20111230225028/p16i7ncbsvq3o143n1gdamcn13i21.jpg'
                          ][Math.round(Math.random()*3)];
                          return img;
                      }
                  };
                  extend(Sky,Thing);
                  var scene = new Scene({
                      'element':'box'
                  });
                  for(var i= 0 ; i < 50 ;i++){
                      scene.addThing(new Diam({
                          wh:new WH(100,100),
                          xyz:new XYZ(Math.random() * document.body.clientWidth,Math.random() *document.body.clientHeight,Math.random() *8000)
                      }));
                  }
                  scene.addThing(new Sky({
                          wh:new WH(160000,120000),
                          xyz:new XYZ(-80000,-60000,54000),
                          isOpacity:false
                      }));
              }(window);
          </script></body>
</html>

效果2

效果3

效果4

<!doctype html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
<title>伪3d透视效果</title>
<style>
html,body{ padding:0px; margin:0px; height:100%; width:100%;overflow:hidden;}
#box{ background:#ccc; height:100%; border:1px solid #ccc;position:relative; overflow:hidden;}
#debug{ width:200px; background:#fff; border:1px solid #ccc; position:absolute; left:10px; top:0px;}
</style>
</head>
<body>
<div id="box">
</div>
<div id="debug"></div>
  <script>
             void function(window){
                 var document = window.document;
                 var debug = document.getElementById('debug');
                 function ObjtoStr(obj){
                     var arr = [];
                     for(var i in obj){
                         if(isNaN(obj[i])) continue;
                         arr.push(i + ':' + obj[i]);
                     }
                     return arr.join('; ');
                 }
                 function getElementOffset(element){
                     var left = 0, top = 0;
                         do{
                             left += element.offsetLeft;
                             top += element.offsetTop;
                         }while(element = element.offsetParent);
                         return {
                             left:left,
                             top:top
                         };
                 }
                 function getMouseOffset(event){
                     return {
                         x:(event.pageX || event.clientX + document.body.scrollLeft - document.body.clientLeft),
                         y:(event.pageY || event.clientY + document.body.scrollTop - document.body.clientTop)
                     };
                 }
                 function addEventListener(element,type,fun){
                     if(element.addEventListener){
                         element.addEventListener(type,function(event){
                             fun(event);
                         },false);
                     }else{
                         element.attachEvent('on'+type,function(){
                             fun(window.event);
                         });
                     }
                 }
                 function extend(subClass,supClass){
                     var fun = function(){},
                         prototype = subClass.prototype;
                     fun.prototype = supClass.prototype;
                     subClass.prototype = new fun();
                     for(var i in prototype){
                         subClass.prototype[i] = prototype[i];
                     }
                     subClass.$supClass = supClass;
                     subClass.prototype.$supClass = function(){
                         var supClass = arguments.callee.caller.$supClass;
                         if(typeof supClass == 'function'){
                              supClass.apply(this,arguments);
                              this.$supClass = supClass;
                         }
                     };
                     subClass.prototype.constructor = subClass;
                     return subClass;
                 }
                 /**
                  * WH类，高宽
                  */
                 function WH(w,h){
                     this.w = w;
                     this.h = h;
                 }
                 WH.prototype = {
                     clone:function(){
                         return new WH(this.w,this.h);
                     }
                 };
                 /**
                  * xyz坐标类
                  * 
                  */
                 function XYZ(x,y,z){
                     this.x = x;
                     this.y = y;
                     this.z = z;
                 }
                 XYZ.prototype = {
                     clone:function(){
                         return new XYZ(this.x,this.y,this.z);
                     }
                 };
                 /**
                  * 场景类
                  */
                 function Scene(options){
                     //属性
                     //dom
                     this.element = null;
                     //场景距离
                     this.fl = 500;
                     this.wh = null;
                     //基准z轴
                     this.baseZ = 0;
                     //中心消失点坐标
                     this.cX = 0;
                     this.cY = 0;
                     //中心消失点便宜
                     this.cXl = 0;
                     this.cYl = 0;
                     //偏移系数
                     this.ce = 9;
                     this.ThingList = [];
                     this.setOption(options);
                     this.init();
                 }
                 Scene.prototype = {
                     setOption:function(options){
                         for(var i in options){
                             switch(i){
                                 case 'element':
                                     this[i] = typeof options[i] == 'string' ? document.getElementById(options[i]) : options[i];
                                     break;
                             }
                         }
                     },
                     init:function(){
                         if(!this.element) throw new Error(90,'not box');
                         this.wh = new WH(this.element.clientWidth,this.element.clientHeight);
                         this.bindEvent();
                     },
                     addThing:function(/* Thing */ thing){
                         this.ThingList.push(thing);
                         this.calcPosition(thing);
                         this.element.appendChild(thing.getElement(this));
                     },
                     //计算位置及大小
                     calcPosition:function(/*Thing*/ thing){
                         this.cX = this.element.clientWidth/2;
                         this.cY = this.element.clientHeight/2;
                         scale = this.fl/(this.fl + thing.xyz.z+this.baseZ);
                         if(scale <= 0){
                             thing.element.style.display = 'none';
                             return ;
                         }else{
                             thing.element.style.display = '';
                         }
                         thing.element.style.width = thing.wh.w * scale + 'px';
                         thing.element.style.height = thing.wh.h * scale + 'px';
                         thing.element.style.top = (this.cY + ((thing.xyz.y+this.cYl-this.cY) * scale)) + 'px';
                         thing.element.style.left = (this.cX + ((thing.xyz.x+this.cXl-this.cX) * scale)) + 'px';
                         thing.element.style.zIndex = Math.round(scale*1000);
                         if(thing.isOpacity){
                             thing.element.style.opacity = Math.min(scale*4.5,1); 
                             thing.element.style.filter = 'alpha(opacity='+(Math.min(scale*4.5,1) * 100)+')';
                         }
                     },
                     bindEvent:function(){
                         var self = this;
                         addEventListener(this.element,'mousemove',function(event){
                             self.onMouseMove(event);
                         });
                         var mousewheel = navigator.userAgent.indexOf('Firefox') > 0 ? 'DOMMouseScroll' : 'mousewheel';
                         addEventListener(this.element,mousewheel,function(event){
                             self.onMouseWheel(event);
                         });
                     },
                     //在场景内移动事件
                     onMouseMove:function(event){
                         //场景的页面坐标
                         var po = getElementOffset(this.element);
                         //鼠标光标的页面坐标
                         var ev = getMouseOffset(event);
                         //场景内坐标
                         var x = ev.x-po.left;
                         var y = ev.y-po.top;
                         //中间消失点的坐标偏移差
                         this.cXl = (this.element.clientWidth/2 - x) * this.ce;
                         this.cYl = (this.element.clientHeight/2 - y) * this.ce;
                         this.reDraw();
                     },
                     onMouseWheel:function(event){
                         var code = event.wheelDelta || -event.detail;
                         if(code > 0){
                             this.baseZ -= 200;
                         }else{
                             this.baseZ += 200;
                         }
                         this.reDraw();
                     },
                     reDraw:function(){
                         for(var i=0 ; i<this.ThingList.length;i++){
                             this.calcPosition(this.ThingList[i]);
                         }
                     }
                 };
                 /**
                  * 物件抽象类
                  */
                 function Thing(options){
                     this.scene = null;
                     this.wh = new WH(10,10);
                     this.xyz = new XYZ(10,10,0);
                     this.element = null;
                     this.isstats = false;
                     this.isOpacity = true;
                     this.setOption(options);
                     this.init();
                 }
                 Thing.prototype = {
                     setOption:function(options){
                         for(var i in options){
                             switch(i){
                                 case 'wh':
                                 case 'xyz':
                                 case 'isOpacity':
                                     this[i] = options[i];
                                     break;
                                 default:
                                     break;
                             }
                         }
                     },
                     init:function(){
                         this.element = this.draw();
                         this.element.style.position = 'absolute';
                         this.element.style.width = this.wh.w + 'px';
                         this.element.style.height = this.wh.h + 'px';
                     },
                     draw:function(){
                         throw new Error(998,'method do not realize!');
                     },
                     getElement:function(/*Scene*/ scene){
                         this.scene = scene;
                         return this.element;
                     }
                 };
                 function Diam(options){
                     this.$supClass(options);
                 }
                 Diam.prototype = {
                     draw:function(){
                         var img = document.createElement('img');
                         loadimg = img.cloneNode(true);
                         loadimg.onload = function(){
                             self.wh = new WH(this.width,this.height);
                         }
                         img.src = [
                             'http://img18.wal8.com/img18/227468_20111230225028/p16i7nbc3s3bt1dt3naj1p3r1u2e7.jpg',
                             'http://img18.wal8.com/img18/227468_20111230225028/p16i7nbc3sverp2e1j9l8rddbv6.jpg',
                             'http://img18.wal8.com/img18/227468_20111230225028/p16i7nbc3sr3a15f2hd6trl1v632.jpg',
                             'http://img18.wal8.com/img18/227468_20111230225028/p16i7nbc3s4e02mb3j01susuve5.jpg',
                             'http://img18.wal8.com/img18/227468_20111230225028/p16i7nbc3sq8lo6puh5su1m4d4.jpg',
                             'http://img18.wal8.com/img18/227468_20111230225028/p16i7nbc3s15nd1nrf1r8018un7jv3.jpg',
                             'http://img18.wal8.com/img18/227468_20111230225028/p16i7nbc3r2frhoe13gr1k6c11tp1.jpg'
                         ][Math.round(Math.random()*6)];
                         return img;
                     }
                 };
                 extend(Diam,Thing);
                 function Sky(options){
                     this.$supClass(options);
                 }
                 Sky.prototype = {
                     draw:function(){
                         var img = document.createElement('img');
                         img.src = [
                             'http://img18.wal8.com/img18/227468_20111230225028/p16i7ncbsv12991dii1fjbif4esn4.jpg',
                             'http://img18.wal8.com/img18/227468_20111230225028/p16i7ncbsv1652hgn13us1ob410423.jpg',
                             'http://img18.wal8.com/img18/227468_20111230225028/p16i7ncbsv15i55d0meuru3obr2.jpg',
                             'http://img18.wal8.com/img18/227468_20111230225028/p16i7ncbsvq3o143n1gdamcn13i21.jpg'
                         ][Math.round(Math.random()*3)];
                         return img;
                     }
                 };
                 extend(Sky,Thing);
                 var scene = new Scene({
                     'element':'box'
                 });
                 for(var i= 20,x,z ; i < 40 ;i++){
                     x = (Math.sin(Math.PI*2*(i/50)) * 1000)+500;
                     y = (Math.cos(Math.PI*2*(i/50)) * 1000)+500;
                     scene.addThing(new Diam({
                         wh:new WH(100,100),
                         xyz:new XYZ(x,y,3000)
                     }));
                 }
                 for(var i=11,x,z ; i < 31 ;i++){
                     x = (Math.sin(Math.PI*2*(i/50)) * 1000)+1680;
                     y = (Math.cos(Math.PI*2*(i/50)) * 1000)+500;
                     scene.addThing(new Diam({
                         wh:new WH(100,100),
                         xyz:new XYZ(x,y,3000)
                     }));
                 }
                 for(var i=9,x,z ; i < 40 ;i++){
                     x = i*50 -890;
                     y = i*60 + 200;
                     scene.addThing(new Diam({
                         wh:new WH(100,100),
                         xyz:new XYZ(x,y,3000)
                     }));
                 }
                 for(var i=9,x,z ; i < 40 ;i++){
                     x = i*-50 +3090;
                     y = i*60 + 200;
                     scene.addThing(new Diam({
                         wh:new WH(100,100),
                         xyz:new XYZ(x,y,3000)
                     }));
                 }
                 for(var i= 20,x,z ; i < 40 ;i++){
                     x = (Math.sin(Math.PI*2*(i/50)) * 1000)+500;
                     y = (Math.cos(Math.PI*2*(i/50)) * 1000)+500;
                     scene.addThing(new Diam({
                         wh:new WH(100,100),
                         xyz:new XYZ(x,y,5000)
                     }));
                 }
                 for(var i=11,x,z ; i < 31 ;i++){
                     x = (Math.sin(Math.PI*2*(i/50)) * 1000)+1680;
                     y = (Math.cos(Math.PI*2*(i/50)) * 1000)+500;
                     scene.addThing(new Diam({
                         wh:new WH(100,100),
                         xyz:new XYZ(x,y,5000)
                     }));
                 }
                 for(var i=9,x,z ; i < 40 ;i++){
                     x = i*50 -890;
                     y = i*60 + 200;
                     scene.addThing(new Diam({
                         wh:new WH(100,100),
                         xyz:new XYZ(x,y,5000)
                     }));
                 }
                 for(var i=9,x,z ; i < 40 ;i++){
                     x = i*-50 +3090;
                     y = i*60 + 200;
                     scene.addThing(new Diam({
                         wh:new WH(100,100),
                         xyz:new XYZ(x,y,5000)
                     }));
                 }
                 scene.addThing(new Sky({
                         wh:new WH(160000,120000),
                         xyz:new XYZ(-80000,-60000,54000),
                         isOpacity:false
                     }));
                 /*
                 for(var i= 0,x,z ; i < 50 ;i++){
                     x = (Math.sin(Math.PI*2*(i/50)) * 1000)+500;
                     z = (Math.cos(Math.PI*2*(i/50)) * 1000)+3000;
                     scene.addThing(new Diam({
                         wh:new WH(100,100),
                         xyz:new XYZ(x,document.body.clientHeight/2+200,z)
                     }));
                 }*/
             }(window);
         </script></body>
</html>

posted @ 2011-12-31 00:15 OD 阅读(7844) 评论(24) 编辑收藏举报

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