[stella] Sprite Movement Demos

["Roger Williams" <mer02@xxxxxxxxxxxxx>]

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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