def METHOD_NAME(self, speed=CAMERA_SPEED):
    """
    Scroll the window to the player.
    if CAMERA_SPEED is 1, the camera will immediately move to the desired position.
    Anything between 0 and 1 will have the camera move to the location with a smoother
    pan.
    """
    position = Vec2(self.player_sprite.center_x - self.width / 2,
                    self.player_sprite.center_y - self.height / 2)
    self.camera_sprites.move_to(position, speed)