ActionScript 範例下載 – 「布朗運動」不規則隨機粒子動畫效果

      var targetX:Number = Math.random()*stage.stageWidth;
      var targetY:Number = Math.random()*stage.stageHeight;
      var speed:Number = Math.random()/10;
      var targetAlpha = Math.random()*1;
      var targetScale = Math.random()*0.8+0.2;
 
      this.alpha = targetAlpha;
      this.scaleX = this.scaleY = targetScale;
      this.addEventListener(Event.ENTER_FRAME,onEnterFrameEvent);
 
      function onEnterFrameEvent(e:Event) {
          if (Math.ceil(Math.random()*100)== 1) {
              targetX = Math.random()*stage.stageWidth;
              targetY = Math.random()*stage.stageHeight;
              speed = Math.random()/50;
              targetAlpha = Math.random()*1;
              targetScale = Math.random()*0.8+0.2;
          }
          this.x += (targetX-x)*speed;
          this.y += (targetY-y)*speed;
          this.alpha += (targetAlpha-alpha)*speed;
          this.scaleX = this.scaleY += (targetScale-this.scaleX)*speed;
      }

      var total:Number = 50;
      var container:Sprite = new Sprite();
      addChild(container);
      for (var i:uint=0; i＜total; i++) {
          var _mc:MovieClip = new ball();
          _mc.x = stage.stageWidth/2;
          _mc.y = stage.stageHeight/2;
          container.addChild(_mc);
      }