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jQuery实现的分子运动小球碰撞效果

m1870164 人气:0

本文实例讲述了jQuery实现的分子运动小球碰撞效果。分享给大家供大家参考,具体如下:

先看效果图吧,因为小球是运动状态的,不好截图,这里就先大体画了一下路线,表示大体意思吧,如果想看真实的效果,自己粘贴下去运行:

小球有点小哟,嘿嘿,没有对细节进行详细的处理,如果像让它完美一点,自己处理下吧!这里是模拟的理想状态下的,没有摩擦力与组里的分子碰撞运动,高科技哟~~~~~~mu~a
代码也没有整理,如果有心的话,把它整理成面向对象形式的吧!

代码如下:

<!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>
  <title></title>
  <script src="jquery-1.7.1.min.js" type="text/javascript"></script>
  <script type="text/javascript" >
    var dim_half_past_PI = dimAngle(Math.PI / 2); // Math.PI/2的约数
    var lastAngle = dimAngle(Math.PI/8); // 发射角度(0-dimAngle(Math.PI))
    var v = 120; //飞行速度【>0】
    var lastPosition = {}; // 最后一次碰撞坐标
    var lastTime = ""; // 最后一次碰撞时间
    var lastDirection = "top"; // 开始发射方向(top,bottom,left,right)
    var horizen = 1; // 水品方向的积数
    var vertical = 1; // 竖直方向的积数
    var box = {};
    function dimAngle(angle) {
      var tempAngle = angle + "";
      return parseFloat(tempAngle.substring(0, 6));
    }
    function getWillDirection(position, box) {
      var direction = lastDirection;
      if (position.x < box.left) {
        direction = "right";
      }
      if (position.x > box.right) { 
        direction = "left"
      }
      if (position.y < box.top) {
        direction = "bottom";
      }
      if (position.y > box.bottom) {
        direction = "top";
      }
      return direction;
    }
    function getScale(direction, angle) { 
      switch(direction){
        case "top":
          vertical = -1;
          if (angle < dim_half_past_PI) {
            horizen = 1;
          }
          if (angle > dim_half_past_PI) {
            horizen = -1;
          }
          if (angle == dim_half_past_PI) {
            horizen = 0;
          }
          break;
        case "left":
          horizen = -1;
          if (angle > dim_half_past_PI) {
            vertical = 1;
          }
          if (angle < dim_half_past_PI) {
            vertical = -1;
          }
          if (angle == dim_half_past_PI) {
            vertical = 0;
          }
          break;
        case "bottom":
          vertical = 1;
          if(angle > dim_half_past_PI) {
            horizen = 1;
          }
          if(angle < dim_half_past_PI) {
            horizen = -1;
          }
          if(angle == dim_half_past_PI) {
            horizen = 0;
          }
          break;
        case "right":
          horizen = 1;
          if (angle > dim_half_past_PI) {
            vertical = -1;
          }
          if (angle < dim_half_past_PI) {
            vertical = 1;
          }
          if (angle == dim_half_past_PI) {
            vertical = 0;
          }
          break;
      }
    }
    function getOutAngle(inAngle) {
      if (inAngle == dim_half_past_PI || inAngle == 0) {
        return inAngle;
      } else {
        return dim_half_past_PI - inAngle;
      }
    }
    function setPosition(obj, position) {
      obj.css({ "left": position.x +"px", "top": position.y +"px"});
    }
    function run(obj) {
      var vx = Math.cos(lastAngle) * v;
      var vy = Math.sin(lastAngle) * v;
      var runTime = (new Date().getTime() - lastTime) / 1000;
      getScale(lastDirection, lastAngle);
      var sx = vx * runTime * horizen;
      var sy = vy * runTime * vertical;
      var position = {
        x: lastPosition.x + sx,
        y: lastPosition.y + sy
      };
      setPosition(obj, position);
      var currentDirection = getWillDirection(position, box);
      console.log(currentDirection +":"+lastDirection+":"+vertical+":"+horizen+":"+lastAngle+":"+dim_half_past_PI);
      // 如果没有发生碰撞
      if (currentDirection != lastDirection) {
        // 如果发生了碰撞
        lastDirection = currentDirection;
        lastPosition = position;
        lastTime = new Date().getTime();
        lastAngle = getOutAngle(lastAngle);
      }
      setTimeout(function () {
        run(obj);
      }, 30);
    }
    $(document).ready(function () {
      var boxer = $("#box");
      var x = parseInt(boxer.offset().left);
      var y = parseInt(boxer.offset().top);
      box = {
        left: x,
        top: y,
        right: x + boxer.width(),
        bottom: y + boxer.height()
      };
      var runner = $("#runner");
      lastTime = new Date().getTime();
      lastPosition = {
        x: x,
        y: y + boxer.height()
      };
      run(runner);
    });
  </script>
  <style type="text/css" >
  body { margin:0; padding:0; }
  #box { margin:0 auto; width:500px; height:500px; border:3px solid #DDDDDD; border-radius:4px; -wekit-border-radius:4px; -moz-border-radius:4px;}
  #runner { width:10px; height:10px; font-size:10px; color:black; padding:0; position:absolute; left:100px; top:480px;}
  </style>
</head>
<body>
<div id="box">
<div id="runner">●</div>
</div>
</body>
</html>

希望本文所述对大家jQuery程序设计有所帮助。

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