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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