/* 定义四个全局变量，定义位置 */
_global.gLEFT = 0;
_global.gTOP = 0;
_global.gRIGHT = Stage.width;
_global.gBOTTOM = Stage.height;
 
/* ５个变量定义元件的速度、最大、最小、数量*/
var maxSpeed:Number = 25;
var minSize:Number = 4;
var maxSize:Number = 10;
var minFragments:Number = 50;
var maxFragments:Number = 150;
 
/* 在最大和最小之间返回一个数的函数 */
function randRange(min:Number, max:Number):Number {
  var randomNum:Number = Math.floor(Math.random() * (max - min + 1)) + min;
  return randomNum;
}
 
/* 主程序片段 */
onMouseDown = function():Void {
  var totalFragments:Number = randRange(minFragments, maxFragments);
  var fragment_mc:MovieClip;
  var depth:Number = this.getNextHighestDepth();
 
  for (var i:Number = 0; i < totalFragments; i++, depth++) {
    fragment_mc = attachMovie("Fragment", "fragment" + depth, depth);
    fragment_mc._x = _xmouse;
    fragment_mc._y = _ymouse;
    fragment_mc._width = fragment_mc._height = randRange(minSize, maxSize);
    while(!fragment_mc.speedX) {
      fragment_mc.speedX = randRange(-maxSpeed, maxSpeed);
    }
    while(!fragment_mc.speedY) {
      fragment_mc.speedY = randRange(-maxSpeed, maxSpeed);
    }
    fragment_mc._alpha = randRange(10, 100);
    fragment_mc.cacheAsBitmap = true;
 
    fragment_mc.onEnterFrame = function():Void {
      this._x += this.speedX;
      this._y += this.speedY;
 
      if (this._x < gLEFT || this._x > gRIGHT || this._y < gTOP || this._y > gBOTTOM) {
        this.removeMovieClip();
      }
    };
  }
};