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penrose (1)
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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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