[stella] Sprite Movement Demos

Subject: [stella] Sprite Movement Demos
From: "Roger Williams" <mer02@xxxxxxxxxxxxx>
Date: Sat, 20 Oct 2001 15:10:36 -0700
These two demos show the movement of player 0 alone of both
players, and should make a good launching point for a beginner
who wants to investigate sprite graphics, especially with
techniques that cannot rely on successive HMOVEs for horizontal
positioning.  Bits and pieces of this appear in the list (some
with bugs) but these have been fully debugged and tested on a
real 2600.
The method I use to count down the screen to set GRPx is not
compatible with VDEL, but it does allow the sprites to scroll
smoothely off the top and bottom of the screen.  (Horizontal
edge effects are not treated.)  I could not use Y as the
screen counter because I want it for something else :-)  I
needed this code to provide a freamework for the next (much
more interesting) demo I will be posting,and figured someone
might find the code useful.
--Roger Williams

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