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NAME
     penrose - draws quasiperiodic tilings

SYNOPSIS
     penrose [-display host:display.screen]  [-foreground  color]
     [-background  color]  [-window]  [-root]  [-mono] [-install]
     [-visual visual] [-ncolors  integer]  [-delay  microseconds]
     [-redoDelay seconds] [-size integer] [-ammann] [-no-ammann]


DESCRIPTION
     The penrose program draws quasiperiodic tilings.

     See Onoda, Steinhardt, DiVincenzo and Socolar in Phys.  Rev.
     Lett.  60,  #25, 1988 or Strandburg in Computers in Physics,
     Sep/Oct 1991.

     This implementation uses the simpler version of  the  growth
     algorithm, i.e., if there are no forced vertices, a randomly
     chosen tile is added to a randomly chosen vertex (no prefer-
     ence for those 108 degree angles).

     There  are  two  essential  differences  to  the   algorithm
     presented in the literature: First, we do not allow the til-
     ing to enclose an untiled area.  Whenever this is in  danger
     of  happening,  we  just  do  not add the tile, hoping for a
     better random choice the next time.  Second, when choosing a
     vertex  randomly,  we  will  take  one that lies withing the
     viewport if available.  If this seems to cause enclosures in
     the forced rule case, we will allow invisible vertices to be
     chosen.

     Tiling is restarted whenever one of the  following  happens:
     there  are no incomplete vertices within the viewport or the
     tiling has extended a window's length beyond the edge of the
     window  horizontally or vertically or forced rule choice has
     failed 100 times due to areas about to become enclosed.

     Although quasiperiodic tilings are produced, the tiles them-
     selves  are not penrose tiles (darts and kites). In contrast
     to penrose tiles, these tiles can  be  arranged  to  form  a
     periodic tiling.


OPTIONS
     penrose 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.

     -ncolors integer
             How  many  colors  should  be  used  (if  possible).
             Default 64.  The colors are chosen randomly.

     -size integer
             How big the tiles should be.  Default 40 pixels.


     -delay milliseconds
             How long (in 1/1,000,000'ths of a  second)  to  wait
             between  drawing  each  tile.  Default 10,000 or .01
             seconds.


     -redoDelay seconds
             How long to wait between starting a  completely  new
             tiling.  Default 3 seconds.


     -ammann integer

     -no-ammann integer
             Whether Ammann lines should be added.


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), xlock(1)

COPYRIGHT
     Copyright O 1996 by Timo Korvola.

     Permission  to  use,  copy,  modify,  and  distribute   this
     software  and  its documentation for any purpose and without
     fee is hereby granted, provided  that  the  above  copyright
     notice  appear  in  all  copies and that both that copyright
     notice and this permission notice appear in supporting docu-
     mentation.

AUTHOR
     Timo Korvola <tkorvola@dopey.hut.fi>, 1996.

     Ability to run standalone  or  with  xscreensaver  added  by
     Jamie Zawinski <jwz@jwz.org>, 10-May-97.

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