penrose man page on DigitalUNIX

Man page or keyword search:  
man Server   12896 pages
apropos Keyword Search (all sections)
Output format
DigitalUNIX logo
[printable version]

XScreenSaver(1)						       XScreenSaver(1)

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  preference	 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 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	verti‐
       cally  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.

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 draw‐
	       ing 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 © 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, pro‐
       vided that the above copyright notice appear in	all  copies  and  that
       both  that  copyright  notice and this permission notice appear in sup‐
       porting documentation.

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.

X Version 11			   10-May-97		       XScreenSaver(1)
[top]

List of man pages available for DigitalUNIX

Copyright (c) for man pages and the logo by the respective OS vendor.

For those who want to learn more, the polarhome community provides shell access and support.

[legal] [privacy] [GNU] [policy] [cookies] [netiquette] [sponsors] [FAQ]
Tweet
Polarhome, production since 1999.
Member of Polarhome portal.
Based on Fawad Halim's script.
....................................................................
Vote for polarhome
Free Shell Accounts :: the biggest list on the net