Path: utzoo!utgpu!news-server.csri.toronto.edu!mailrus!uwm.edu!ux1.cso.uiuc.edu!ux1.cso.uiuc.edu!m.cs.uiuc.edu!sunb4!mcooper
From: mcooper@sunb4.cs.uiuc.edu
Newsgroups: comp.graphics
Subject: bit masks
Message-ID: <23900013@sunb4>
Date: 29 Aug 90 18:11:00 GMT
Lines: 59
Nf-ID: #N:sunb4:23900013:000:1566
Nf-From: sunb4.cs.uiuc.edu!mcooper    Aug 29 13:11:00 1990


I'm looking for an algorithm (or C code, of you have it) to generate
16 x 16 bit masks.  Ideally, I should be able to specify a percentage and
the program should spit out the pattern filled appropriately.

ie.

100% yeilds

1111111111111111
1111111111111111
1111111111111111
1111111111111111
1111111111111111
1111111111111111
1111111111111111
1111111111111111
1111111111111111
1111111111111111
1111111111111111
1111111111111111
1111111111111111
1111111111111111
1111111111111111
1111111111111111

This is no problem to write,m but the simple way gives you nasty artifacts such
as:  25 % yeilds

1000100010001000
1000100010001000
1000100010001000
1000100010001000
1000100010001000
1000100010001000
1000100010001000
1000100010001000
1000100010001000
1000100010001000
1000100010001000
1000100010001000
1000100010001000
1000100010001000
1000100010001000
1000100010001000


Does anyone have code that will properly randomize this stuff to avoid the
inevitable artifacts and moire patterns?


+-------------------------------------+---------------------------------------+
|  "When the going gets weird,        |                                       |
|              the weird turn pro."   |  Marc Cooper	marcc@ncsa.uiuc.edu   |
|		  		      |  National Center for Supercomputing   |
|		 -Hunter S. Thompson  |		    Applications	      |
+-------------------------------------+---------------------------------------+
|            Disclaimer:  "It's mine! It's all mine!!"   -D. Duck	      |
+-----------------------------------------------------------------------------+