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# barrier

Classes representing the parts of the skool that cause obstructions, namely walls, windows and doors.

class `barrier.``Barrier`(barrier_id, x, bottom_y, top_y, climb_phases=(), fly_phases=())

  Abstract superclass of all obstructions.

  Parameters: | barrier_id – The ID of the barrier. x – The x-coordinate of the barrier. bottom_y – The y-coordinate of the bottom of the barrier. top_y – The y-coordinate of the top of the barrier.

  `impedes`(character, distance=0, force_shut=False)

    Return whether a character is impeded by this barrier.

    Parameters: | character (`Character`) – The character to check. distance – The maximum distance in front of the character at which the barrier should be considered an obstruction. force_shut – If True, the barrier will be considered an obstruction even if it’s open; otherwise it will be considered an obstruction only when closed.

  `is_door`()

    Return whether the barrier is a door (or window). Subclasses override this method as appropriate.

    Returns: | False.

  `is_shut`()

    Return whether the barrier is shut. Subclasses override this method as appropriate.

    Returns: | True.

class `barrier.``Door`(door_id, x, bottom_y, top_y, shut, auto_shut_delay, climb_phases, fly_phases=())

  A door that may be opened and closed.

  Parameters: | door_id – The ID of the door. x – The x-coordinate of the door. bottom_y – The y-coordinate of the bottom of the door. top_y – The y-coordinate of the top of the door. shut – Whether the door is shut at the start of the game. auto_shut_delay – The delay before the door shuts automatically; if zero or negative, the door will not shut automatically. climb_phases – The sequence of animation phases to use for Eric if he climbs over the door when it’s shut. fly_phases – The sequence of animation phases to use for Eric if he he flies over the door after hitting it while standing on the saddle of the bike.

  `auto_shut`()

    Return whether this door should automatically shut now.

  `build_images`()

    Build the images for the barrier. This method is called after rescaling the screen or loading a saved game.

  `get_images`()

    Return a 2-tuple containing a list of images of the current state of the door, and the coordinates at which to draw the door.

  `is_door`()

    Return whether this is a door.

    Returns: | True.

  `is_shut`()

    Return whether the door is shut.

  `move`(shut)

    Open or close the door.

    Parameters: | shut – If True, close the door; otherwise open it.
    Returns: | A 2-tuple containing a list of images of the current state of the door, and the coordinates at which to draw the door.

  `set_images`(open_images, shut_images, top_left)

    Define the images to use for the door when open or closed.

    Parameters: | open_images – A list of the images to use when the door is open. shut_images – A list of the images to use when the door is closed. top_left – The coordinates at which to draw the image of the door.

class `barrier.``Wall`(barrier_id, x, bottom_y, top_y, climb_phases=(), fly_phases=())

  A wall in the skool.

  `separates`(a, b)

    Return whether this wall blocks the view from one location to another.

    Parameters: | a (`Location`) – The first location. b (`Location`) – The other location.

class `barrier.``Window`(window_id, x, bottom_y, top_y, shut, opener_coords, phases, not_a_bird)

  A window that may be opened and closed.

  Parameters: | window_id – The ID of the window. x – The x-coordinate of the window. bottom_y – The y-coordinate of the bottom of the window. top_y – The y-coordinate of the top of the window. shut – Whether the window is shut at the start of the game. opener_coords – Where a character should stand to open or close the window. phases – The animation phases to use for Eric if he jumps out of the window. not_a_bird – The ID of the command list Mr Wacker should switch to when Eric hits the ground after jumping out of the window; if not blank, Eric will be paralysed when he hits the ground.

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