[stella] Pointing a sprite at a target.

[bob.montgomery at thomson.com]

Hi Robert,

Very cool!  Thanks for sharing.

-Bob

-----Original Message-----
From: stella-bounces at atari2600.org [mailto:stella-bounces at atari2600.org]
On Behalf Of R Mundschau
Sent: Saturday, June 02, 2007 11:22 PM
To: Atari 2600 programming list
Subject: [stella] Pointing a sprite at a target.

A topic was posted on the AA forums about figuring out how to point a  
sprite at another object on the screen.  A space ship for example  
with 16 facings needs to point at the player's ship.  I have found a  
solution for this problem that I think works well.  I posted the  
solution on AA, but I know not everybody looks there so I wanted to  
share a copy of my solution with the mailing list.  I have attached a  
demo binary (use joy1 to move the white arrow around the purple one),  
and the source code for the subroutine that finds the direction.

Cheers!

Robert M