Re: A86: polygons

To: assembly-86@lists.ticalc.org
Subject: Re: A86: polygons
From: Tercero <tercero@busprod.com>
Date: Sun, 19 Jul 1998 20:47:30 -0700
Delivered-To: assembly-86-outgoing@towerguard.unix.edu.sollentuna.se
Organization: BPS Internet
References: <35AF553C.5712D22D@ibm.net> <3.0.5.16.19980719163533.35c74502@thor.prohosting.com>
Reply-To: assembly-86@lists.ticalc.org


Joshua Grams wrote:
> 
> At 06:46 PM 7/17/98 -0500, you wrote:
> >
> >Umm, what kind of polygons are you talking about?
> >
> >Triangles are the easiest to draw and fill.  Or do you want to draw and
> >fill a random list of vertices, that could be concave or convex?  This
> >would be pretty slow on the calc, because 8 or 16 bit numbers kind of
> >limits fixed-point numbers.
> 
> Why would you need fixed-point? I'd probably just draw the lines, then find
> a point I knew was inside, and use a flood-fill routine. Unless you're
> doing triangles, which as you say, are simple.
> 
> --Joshua

Does anyone know of a routine that would convert (X,Y,Z) coordinates
into (X,Y) coordinates?  And also how to 3D rotate?

-- 
Tercero	 --  Email: mailto:tercero@busprod.com

"The stone the builders rejected has become the capstone;"
			--Psalms 118:22
"Everyone who falls on that stone will be broken to pieces,
but he on whom it falls will be crushed."
			--Luke 20:18

References:

A86: polygons

From: Kirk Meyer <kirk008@ibm.net>

Re: A86: polygons

From: Joshua Grams <j3grams@earthling.net>