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       penrose - draws quasiperiodic tilings

       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]

       The penrose program draws quasiperiodic tilings.

       See Onoda, Steinhardt, DiVincenzo and Socolar in Phys. Rev. Lett. 60, #25, 1988 or Strand-
       burg 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 pref-
       erence for those 108 degree angles).

       There are two essential differences to the algorithm presented in the  literature:  First,
       we do not allow the tiling to enclose an untiled area.  Whenever this is in danger of hap-
       pening, 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 ver-
       tices 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 themselves are  not  penrose  tiles
       (darts  and  kites).  In  contrast to penrose tiles, these tiles can be arranged to form a
       periodic tiling.

       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 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

       -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.


	       Whether Ammann lines should be added.

       DISPLAY to get the default host and display number.

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

       X(1), xscreensaver(1), xlock(1)

       Copyright (C) 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 documentation.

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

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

X Version 11				    10-May-97				  XScreenSaver(1)
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