munch man page on Tru64

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XScreenSaver(1)						       XScreenSaver(1)

NAME
       munch - munching squares screen hack

SYNOPSIS
       munch  [-display	 host:display.screen] [-foreground color] [-background
       color] [-window] [-root] [-mono] [-install]  [-visual  visual]  [-delay
       seconds]	 [-xor]	 [-noxor]  [-shift]  [-noshift]	 [-logminwidth minimum
       width]

DESCRIPTION
       The munch program preforms the munching squares hack until killed.   It
       picks square size, position, and gravity randomly; configurable options
       are listed below.

       The munching squares hack cosists of drawing Y = X XOR T for a range of
       X  and  T  over and over until all the possible combinations of X and T
       have come up.  It was reportedly discovered by Jackson Wright  in  1962
       and took 5 instructions of PDP-6 code.

OPTIONS
       munch accepts the following options:

       -window Draw on a newly-created window.	This is the default.

       -root   Draw on the root window.

       -mono   If on a color display, pretend we're on a monochrome display.

       -install
	       Install a private colormap for the window.

       -visual visual
	       Specify	which  visual  to use.	Legal values are the name of a
	       visual class, or the id number (decimal or hex) of  a  specific
	       visual.

       -delay seconds
	       How long to wait before starting over.  Default 5 seconds.

       -xor    Use the XOR drawing function.  (Default.)

       -no-xor Don't use the XOR drawing function.

       -shift  Start drawing the square at weird starting points.  (Default.)

       -no-shift
	       Don't  shift  and  start	 drawing  the square at weird starting
	       points.

       -logminwidth minimum-width
	       The logarithm (base 2) of the minimum with of a square (must be
	       a power of 2, or some parts of the square aren't.)

ENVIRONMENT
       DISPLAY to get the default host and display number.

       XENVIRONMENT
	       to  get	the  name of a resource file that overrides the global
	       resources stored in the RESOURCE_MANAGER property.

SEE ALSO
       X(1),  xscreensaver(1),	 http://www.inwap.com/pdp10/hbaker/hakmem/hak‐
       mem.html, http://www.comedia.com/Hot/jargon_3.0/JARGON_M/MUNCHSQR.HTML

HISTORY
       Quoted  from  HAKMEM,  for historical interest.	As that document says,
       "Unless otherwise stated, all computer programs are in PDP-6/10	assem‐
       bly language."

       ITEM 146: MUNCHING SQUARES
	       Another	simple	display	 program.  It is thought that this was
	       discovered by Jackson Wright on the RLE PDP-1 circa 1962.

		   DATAI 2
		   ADDB 1,2
		   ROTC 2,-22
		   XOR 1,2
		   JRST .-4
	       2=X, 3=Y. Try things like 1001002 in data switches.  This  also
	       does  interesting  things  with	operations other than XOR, and
	       rotations other than -22. (Try IOR; AND; TSC; FADR; FDV(!); ROT
	       -14, -9, -20, ...)

       ITEM 147 (Schroeppel):
	       Munching	 squares  is  just  views of the graph Y = X XOR T for
	       consecutive values of T = time.

       ITEM 148 (Cohen, Beeler):
	       A modification to munching squares which reveals them in frozen
	       states  through	opening	 and closing curtains: insert FADR 2,1
	       before the XOR. Try data switches =

		   4000,,4    1000,,2002    2000,,4    0,,1002
	       (Notation: <left half>,,<right half>)

	       Also try the FADR after the XOR, switches = 1001,,1.

COPYRIGHT
       Copyright © 1997 by Tim Showalter.  Permission to  use,	copy,  modify,
       distribute,  and	 sell this software and its documentation for any pur‐
       pose is hereby granted without fee, provided that the  above  copyright
       notice  appear  in  all	copies and that both that copyright notice and
       this permission notice appear in supporting documentation.   No	repre‐
       sentations are made about the suitability of this software for any pur‐
       pose.  It is provided "as is" without express or implied warranty.

AUTHOR
       Tim Showalter <tjs@andrew.cmu.edu>, 17-Jun-97, based on what's  in  the
       Jargon File and stealing stuff from existing xscreensaver modules.

X Version 11			   17-Jun-97		       XScreenSaver(1)
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