A86: Re: Sierpinski Problems

To: <assembly-86@lists.ticalc.org>
Subject: A86: Re: Sierpinski Problems
From: "Dux Gregis" <assets@eden.rutgers.edu>
Date: Sun, 6 Dec 1998 00:58:31 -0500
Delivered-To: assembly-86-outgoing@towerguard.unix.edu.sollentuna.se
Reply-To: assembly-86@lists.ticalc.org




>
>Hello.  I'm almost ready to release my Sierpinski Fractal Drawer.  It's
>pretty neato, since it uses my own routine that's so fast, it only takes
>about 0.2 seconds to draw the whole thing!  =)
>
>The one problem, is that if there's any small interference, the whole thing
>goes outta whack.  The main thing is when the user leaves the Axes On, has
>not cleared the graphmem, or has left FNON.
>
>Now the questions:
>Which Flag do I reset in order to disable the Axes?

it appears that set 5,(iy+4) will turn off the axes
res 5,(iy+4) will turn them back on

>How do I prevent it from getting messed up if the user has something drawn
>in the graph screen?

clear the graph screen:
 ld hl,_plotSScreen
 ld de,_plotSScreen+1
 ld bc,1023
 ld (hl),0
 ldir


>Does _clrLCD affect the GRAPHMEM?

no

>How do I turn FNOFF in ASM?  Is there a flag to reset?

it probably has to do with a flag in the equation variable VAT entry or
something like that, aar you'd be better off not worrying about it

>Should I just do this stuff in BASIC, and call the actual Sieprinski
program
>from a BASIC program?  (It can't be run from a shell anyways).
>
>Thanks a bunch!
>
>P.S.  -  Should I send what I already have?  (Two components:  ASM drawer:
>131 bytes, BASIC drawer:  ONLY 7 LINES LONG!!  =), the BASIC program only
>spends about 2 minutes drawing the whole thing...It uses my own routine.
>