Re: A86: ASM Programming Test

To: <assembly-86@lists.ticalc.org>
Subject: Re: A86: ASM Programming Test
From: "Dux Gregis" <assets@eden.rutgers.edu>
Date: Wed, 2 Dec 1998 15:32:21 -0500
Delivered-To: assembly-86-outgoing@towerguard.unix.edu.sollentuna.se
Reply-To: assembly-86@lists.ticalc.org




>
>> it's actually an easy problem at its barest elements (easier than
>collision
>> detction proper): all you have to do is look at the each byte of
>video mem
>> with the sprite you are checking collision with and AND it with the
>byte of
>> the sprite you are checking collision against.  If the result isn't
>zero,
>> then you'd have a collision.
>
>
>Wouldn't that be true only if you are using alligned sprites, or am I
>missing something?
>


All sprites are aligned, it's just that most PutSprites routines do shifting
to move the sprite to non-aligned coordinates.  So here you would check
collisions within your non-aligned PutSprite after you do the shifting.