Re: [stella] Trick12

Subject: Re: [stella] Trick12
From: "Eckhard Stolberg" <Eckhard_Stolberg@xxxxxx>
Date: Wed, 14 Mar 2001 20:52:52 +0100
> Assuming the big advantage of using sprites over playfield for a board
> is resolution, why not create circular sprite shapes with an open center,
> and then you can "fill in" the white player's sprite with playfield and
> black player can remain a hollow outline?  When you want to turn off that
> sprite you'd make it the same color as the playfield and turn off the
> filling (if necessary).  You'd still be able to draw coarse grid lines in
> playfield that way.

No, the two different colours are coming from the playfield and the
background. In the area where the 12 sprites are meant to be displayed
Thomas changes the playfield to colour 1 and the background to colour
2. Then he sets up a playfield pattern according to where which colour
is supposed to show, and masks out the shapes with the player graphics.
The two players are actually set to black, like the background in
those areas, where the sprites aren't displayed. So, unfortunately
this routine won't be usable, if the individual sprites need to have
more than two states.

Ciao, Eckhard Stolberg

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