Circles Tutorial

Anything Sinclair ZX Basic related; history, development, tips - differences between BASIC on the ZX80 and ZX81
Post Reply
User avatar
GCHarder
Posts: 427
Joined: Sat Dec 14, 2013 7:46 pm

Circles Tutorial

Post by GCHarder »

From Compute! July 1983.

BASIC tutorial to draw circles, not mentioned in the article but it's quite easy to modify to draw squares and diamonds as well.

I've included a standard, WRX and Pseudo-Res versions.

Regards;

Greg
Attachments
Circles.zip
Program and support files
(648.61 KiB) Downloaded 297 times
Screenies
Screenies
Circles.gif (7.08 KiB) Viewed 4112 times
User avatar
XavSnap
Posts: 1940
Joined: Sat May 10, 2008 4:23 pm
Location: 'Zx81 France' Fb group.

Re: Circles Tutorial

Post by XavSnap »

Cool !

Thanks Greg.
Xavier ...on the Facebook groupe : "Zx81 France"(fr)
Crayon21
Posts: 348
Joined: Sun Nov 04, 2018 2:33 am

Re: Circles Tutorial

Post by Crayon21 »

I'm trying to draw XANA from code lyoko. What values should I use?
In Heck, there are two options for perpetual torment:

Eat the Puckerberry and suffer for eternity:
drink nothing but a cocktail of The Last Dab and Mexican Cake blended and served with
habanero slices
:twisted:
User avatar
SafePit
Posts: 43
Joined: Mon Feb 20, 2012 7:06 pm
Location: Boise, ID
Contact:

Re: Circles Tutorial

Post by SafePit »

Great find! I decided to take the BASIC and convert it to z80 assembly. The routine is super fast, so I turned it into a screen saver of sorts. Even has Chroma support. Love these kinds of challenges.
Image
ImageScreen Shot 2022-09-01 at 1.12.10 AM by Steven Reid, on Flickr
Image
Image
David G
Posts: 387
Joined: Thu Jul 17, 2014 7:58 am
Location: 21 North, 156 West

Re: Circles Tutorial

Post by David G »

Is that an Atari 800 font in the PSI version? So cool
GCHarder wrote: Fri Oct 30, 2020 9:42 pm From Compute! July 1983.

BASIC tutorial to draw circles, not mentioned in the article but it's quite easy to modify to draw squares and diamonds as well.

I've included a standard, WRX and Pseudo-Res versions.
User avatar
GCHarder
Posts: 427
Joined: Sat Dec 14, 2013 7:46 pm

Re: Circles Tutorial

Post by GCHarder »

That is a custom font developed by Paul Farrow specifically for PSI-Res applications. See his "Celebration"' demo.
Greg
Post Reply