Re: A86: Enhanced Checking Routine?

Re: A86: Enhanced Checking Routine?

• To: assembly-86@lists.ticalc.org
• Subject: Re: A86: Enhanced Checking Routine?
• From: Trey Jazz <joemama@minot.com>
• Date: Sat, 20 Dec 1997 11:29:29 -0600
• References: <3.0.5.32.19971219234151.0079e870@postoffice.worldnet.att.net> <3.0.5.32.19971220113103.007a7960@postoffice.worldnet.att.net>
• Reply-To: assembly-86@lists.ticalc.org

heres a quick runthrough of it:

 Collision routine(C) Trey Jazz 1997
 ld a,<leftmost pixel of sprite one>
 sub 1 ;use this so the carry will work right
 ld b,<x coord of pixel>
 cp b
 jr nc,no_hit
 add a,7      ;load the rightmost pixel
 sub b        ;subtract the location of the second sprite from it
 jr c,no_hit  ;outside of the sprite to the right so go to no_hit
 ld a,<sprite one y coord>
 sub 1
 ld b,<pixel y coord>
 cp b
 jr nc,no_hit
 add a,7
 sub b
 jr c,no_hit
good_hit:


note: use the middle of the X for the second sprite location

well there ya go

• Re: A86: Enhanced Checking Routine?
• From: "A. El-Helw" <ahmed3@worldnet.att.net>

• A86: Enhanced Checking Routine?
• From: "A. El-Helw" <ahmed3@worldnet.att.net>
• Re: A86: Enhanced Checking Routine?
• From: "A. El-Helw" <ahmed3@worldnet.att.net>

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