🚀 go-pugleaf

 
  I am trying to create a horizontal scrolling background.  I believe
that to do this I create a virtual screen that is larger than the physical
screen and pan across the virtual screen.  I place the tiles on the off-screen
portion and then pan to the right to smoothly reveal them.
 
    Visible portion of virtual screen
    |       +----- Placement of new tiles
    \/      \/   /------- End of virtual screen
+---+-------+---+
|   |       |X  |
|   |       |X  |
+---+-------+---+
 
 
I then continue the process of adding new tiles and panning to achieve
the scrolling effect.
 
My question is, what do I do when I reach the end of the virtual screen.
I want to have the illusion of an inifinitely long background.  I have tried
panning past the end of the virtual screen, the left side wraps around
successfully, but I loose the top line of the background each time.
 
Also, provided there is enough video memory left over, is it possible
to implement double buffering/page flipping AND panning AND/OR a split
screen for smooth animation of any objects?

--John C. Zurawski