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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 ran-
     domly; 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 com-
     binations 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/hakmem.html,
     http://www.comedia.com/Hot/jargon_3.0/JARGON_M/MUNCHSQR.HTML

HISTORY
     Quoted from HAKMEM, for historical interest.  As that  docu-
     ment  says,  "Unless otherwise stated, all computer programs
     are in PDP-6/10 assembly 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 O 1997 by Tim Showalter.  Permission to use, copy,
     modify,  distribute, and sell this software and its documen-
     tation for any purpose is hereby granted without  fee,  pro-
     vided  that  the above copyright notice appear in all copies
     and that both that  copyright  notice  and  this  permission
     notice  appear  in supporting documentation.  No representa-
     tions are made about the suitability of  this  software  for
     any  purpose.   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.

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