/** Update the game logic related to aliens */
  public void doLogic() {
    // swap over horizontal movement and move down the
    // screen a bit
    //		dx = -dx;
    //		y += 10;
    //
    //		// if we've reached the bottom of the screen then the player
    //		// dies
    //		if (y > 570) {
    //			game.bothPlayers_notifyDeath();
    //		}

    currentAngle += moveSpeed;
    super.setRotatedAngle(currentAngle);
  }