package {
 import flash.display.Sprite;
 import flash.events.KeyboardEvent;
 import flash.ui.Keyboard;
 
 public class animation_ch02_KeyCodes extends Sprite {
  private var ball:Sprite;
  
  public function animation_ch02_KeyCodes() {
   init();
  }
//@ init(s)
  private function init():void {
   ball = new Sprite();
   addChild(ball);
   ball.graphics.beginFill(0xff0000);
   ball.graphics.drawCircle(0, 0, 40);
   ball.graphics.endFill();
   ball.x = stage.stageWidth / 2;
   ball.y = stage.stageHeight / 2;
   stage.addEventListener(KeyboardEvent.KEY_DOWN, onKeyboardEvent);
  }
//@ keyboard(s)
  public function onKeyboardEvent(event:KeyboardEvent):void {
   switch(event.keyCode) {
    case Keyboard.UP :
    ball.y -= 10;
    break;
     
    case Keyboard.DOWN :
    ball.y += 10;
    break;
    
    case Keyboard.LEFT :
    ball.x -= 10;
    break;
    
    case Keyboard.RIGHT :
    ball.x += 10;
    break;
    
    default:
    break;
   }
  }
 }
}