A83: Re: call question

To: <assembly-83@lists.ticalc.org>
Subject: A83: Re: call question
From: "David Phillips" <electrum@tfs.net>
Date: Sat, 24 Oct 1998 17:14:46 -0500
Delivered-To: assembly-83-outgoing@towerguard.unix.edu.sollentuna.se
Reply-To: assembly-83@lists.ticalc.org


You call your FindPixel function, then check to see if it is on or off:

FindPixel:
; IN: B,C = X,Y
; OUT: HL = pointer to pixel in video buffer, A = mask
...

ld bc,(37 << 8)+25        ; check pixel at (37, 25)
call FindPixel            ; get address/mask
and (hl)                  ; test pixel
jr z,pixel_is_off         ; if zero, pixel is off
pixel_is_on:              ; if not, it is on


-----Original Message-----
From: Heydude27@aol.com <Heydude27@aol.com>
To: assembly-83@lists.ticalc.org <assembly-83@lists.ticalc.org>
Date: Saturday, October 24, 1998 11:23 AM
Subject: A83: call question


>
>Does anyone know how to detect if a pixel is on or off, and how to use it.
>Thanks

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