package {
 import flash.display.Sprite;
 import flash.display.StageAlign;
 import flash.display.StageScaleMode;
 import flash.events.Event;
 import flash.events.KeyboardEvent;
 import flash.ui.Keyboard;

 public class animation_ch15_MultiBounce3D extends Sprite
 {
  private var balls:Array;
  private var numBalls:uint = 50;
  private var fl:Number = 250;
  private var vpX:Number = stage.stageWidth / 2;
  private var vpY:Number = stage.stageHeight / 2;
  private var top:Number = -100;
  private var bottom:Number = 100;
  private var left:Number = -100;
  private var right:Number = 100;
  private var front:Number = 100;
  private var back:Number = -100;
  
  public function animation_ch15_MultiBounce3D()
  {
   init();
  }
  
//@ init(s)
  private function init():void
  {
   stage.align = StageAlign.TOP_LEFT;
   stage.scaleMode = StageScaleMode.NO_SCALE;
   
   balls = new Array();
   for(var i:uint = 0; i < numBalls; i++)
   {
    var ball:animation_ch15_Ball3D = new animation_ch15_Ball3D(15);
    balls.push(ball);
    ball.vx = Math.random() * 10 - 5;
    ball.vy = Math.random() * 10 - 5;
    ball.vz = Math.random() * 10 - 5;
    addChild(ball);
   }
   addEventListener(Event.ENTER_FRAME, onEnterFrame);
  }
//@ frame(s)
  
  private function onEnterFrame(event:Event):void
  {
   for(var i:uint = 0; i < numBalls; i++)
   {
    var ball:animation_ch15_Ball3D = balls[i];
    move(ball);
   }
  }
//@ move(s)
  
  private function move(ball:animation_ch15_Ball3D):void
  {
   var radius:Number =  ball.radius;
   
   ball.xpos += ball.vx;
   ball.ypos += ball.vy;
   ball.zpos += ball.vz;
   
   if(ball.xpos + radius > right)
   {
    ball.xpos = right - radius;
    ball.vx *= -1;
   }
   else if(ball.xpos - radius < left)
   {
    ball.xpos = left + radius;
    ball.vx *= -1;
   }
   if(ball.ypos + radius > bottom)
   {
    ball.ypos = bottom - radius;
    ball.vy *= -1;
   }
   else if(ball.ypos - radius < top)
   {
    ball.ypos = top + radius;
    ball.vy *= -1;
   }
   if(ball.zpos + radius > front)
   {
    ball.zpos = front - radius;
    ball.vz *= -1;
   }
   else if(ball.zpos - radius < back)
   {
    ball.zpos = back + radius;
    ball.vz *= -1;
   }
   
//@ check(s)
   if(ball.zpos > -fl)
   {
    var scale:Number = fl / (fl + ball.zpos);
    ball.scaleX = ball.scaleY = scale;
    ball.x = vpX + ball.xpos * scale;
    ball.y = vpY + ball.ypos * scale;
    ball.visible = true;
   }
   else
   {
    ball.visible = false;
   }
  }
 }
}