Path: utzoo!attcan!uunet!cs.utexas.edu!wuarchive!rex!uflorida!reef.cis.ufl.edu!jdb
From: jdb@reef.cis.ufl.edu (Brian K. W. Hook)
Newsgroups: comp.graphics
Subject: Hexagonal bit maps
Message-ID: <26275@uflorida.cis.ufl.EDU>
Date: 12 Jan 91 09:36:33 GMT
Sender: news@uflorida.cis.ufl.EDU
Organization: UF CIS Dept.
Lines: 22


I am writing an app that uses an hexagonal map...each hex in the map has
its own bit map.  I am running into the problem of how to use the Borland
Graphics interface (actually, ANY graphics library with a getimage/putimage
type function set) to write the hex bit map on the screen without writing
into the area of the rectangular bit map outside of the hex....e.g.


       0011111100
       0111111110
       1111111111
       0111111110
       0011111100

I don't want ANYTHING written into the region with zeros.  This wouldn't be
so hard if it was just black and white, but I am using 4-bit color.  Does
anyone know of an easy method of overlay this rectangular block on the
screen but with only the hex part showing up?

thanks for the help,

Brian