private void OnEnemyShipsPositionChange(EnemyShipsPositionChangeEventArgs args)
 {
     SendShipsPositions?.Invoke(this, args);
 }
 public void ReceiveShipsPositions(object sender, EnemyShipsPositionChangeEventArgs args)
 {
     bullets.Where(v => v.BulletType == BulletType.PlayerRocket).Select(v => (PlayerRocket)v)
     .ToList().ForEach(v => v.UpdatePositionByY(args.enemyShipPositions));
 }