$Date: 2005/10/23 10:46:16 $
$Revision: 1.3 $
-- Creates a EM_NEVER_ENDING_BACKGROUND_HORIZONTAL from back_ground.
-- Returns reference to the singleton
-- (From EM_TIME_SINGLETON)
-- Should Current not scale when drawed?
-- True means that the object will be drawed unscaled
-- but its position (reference_point) will still be transformed correctly
-- if drawed on a transformed scaled coordinate system
-- (This is handled accordingly by draw_object of EM_SURFACE)
-- (From EM_DRAWABLE)
-- Horizontal position, distance in pixels from left
-- (From EM_DRAWABLE)
-- Vertical position, distance in pixels from top
-- (From EM_DRAWABLE)
-- Draw rectangular part of Current defined by a_rect to a_surface.
-- (Subclasses could redefine this feature for providing an implementation
-- with better performance, otherwise its just done per default by
-- transforming and clipping coordinates on a_surface before calling draw).
-- (From EM_DRAWABLE)
-- Update cur_position up to cur_time.
-- (From EM_ANIMATABLE)
-- The current position in the image
-- (From EM_NEVER_ENDING_BACKGROUND)
-- Sets cur_position to i, only change cur_position if you know what you are doing
-- (From EM_NEVER_ENDING_BACKGROUND)
-- Sets the speed to i pixels per second
-- (From EM_NEVER_ENDING_BACKGROUND)
-- The speed in pixels per sec
-- (From EM_NEVER_ENDING_BACKGROUND)
-- Have events been initialized?
-- (From EM_DRAWABLE)
-- Event initialization.
-- Needs to be called before subscribing for events.
-- (From EM_DRAWABLE)
-- Mouse button down event,
-- gets published when the mouse button is pressed over Current,
-- an EM_MOUSEBUTTON_EVENT is passed as argument
-- (From EM_DRAWABLE)
-- Mouse button up event,
-- gets published when the mouse button is released over Current,
-- an EM_MOUSEBUTTON_EVENT is passed as argument
-- (From EM_DRAWABLE)
-- Mouse button up event,
-- gets published when the mouse button is released over Current,
-- an EM_MOUSEMOTION_EVENT is passed as argument
-- (From EM_DRAWABLE)
-- Publish mouse event when a_mouse_event occured on Current.
-- Descendants should redefine this feature
-- for only catching and publishing their mouse events when mouse pointer
-- is realy inside object or for
-- distributing mouse events to child objects.
-- (From EM_DRAWABLE)
-- Orthogonal rectangle surrounding Current; (i.e. usefull
-- for visibility testing if it intersects with
-- coordinate_area of EM_SURFACE) TODO: We create a new
-- one on each call. Maybe there is a more efficient way to
-- do that?
-- (From EM_DRAWABLE)
-- Reference point of Current relative to which it should be positioned.
-- (i.e. important when drawn on a scaled coordinate system and is_size_fixed is True)
-- (From EM_DRAWABLE)
An EM_NEVER_ENDING_BACKGROUND_HORIZONTAL is an EM_NEVER_ENDING_BACKGROUND
constraint to horizontal movement.