class Ball extends MovieClip
{
	private var vx, vy;
	
	public function Ball(  )
	{
		stop();
	}	

	public function move(  )
	{
		this._x += vx;
		this._y += vy;
		
		if ( this._x >= Stage.width-(this._width/2) || this._x < this._width/2 )
			vx *= -1;
			
		if ( this._y >= Stage.height-(this._height/2) || this._y < this._height/2 )
			vy *= -1;
		
	}	
	
	public function kill()
	{
		play();
	}	
	
	public function startSpeed( speed )
	{
		vx = Math.random()*4 -2;
		vy = Math.random()*-3 - ( speed/20);
	}

}