ftp://ftp.uni-heidelberg.de/pub/X11/contrib/applications/xscreensaver-2.07.tar.gz

[xscreensaver] / local / man / man.1 / penrose.1

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-.TH XScreenSaver 1 "10-May-97" "X Version 11"
-.SH NAME
-penrose - draws quasiperiodic tilings
-.SH SYNOPSIS
-.B penrose
-[\-display \fIhost:display.screen\fP] [\-foreground \fIcolor\fP] [\-background \fIcolor\fP] [\-window] [\-root] [\-mono] [\-install] [\-visual \fIvisual\fP] [\-ncolors \fIinteger\fP] [\-delay \fImicroseconds\fP] [\-size \fIinteger\fP] [\-ammann] [\-no\-ammann]
-
-.SH DESCRIPTION
-The \fIpenrose\fP 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 vertically or forced rule choice has failed 100
-times due to areas about to become enclosed.
-
-.SH OPTIONS
-.I penrose
-accepts the following options:
-.TP 8
-.B \-window
-Draw on a newly-created window.  This is the default.
-.TP 8
-.B \-root
-Draw on the root window.
-.TP 8
-.B \-mono 
-If on a color display, pretend we're on a monochrome display.
-.TP 8
-.B \-install
-Install a private colormap for the window.
-.TP 8
-.B \-visual \fIvisual\fP
-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.
-.TP 8
-.B \-ncolors \fIinteger\fP
-How many colors should be used (if possible).  Default 64.
-The colors are chosen randomly.
-.TP 8
-.B \-size \fIinteger\fP
-How big the tiles should be.  Default 40 pixels.
-
-.TP 8
-.B \-ammann \fIinteger\fP
-.TP 8
-.B \-no\-ammann \fIinteger\fP
-Whether Ammann lines should be added.
-
-.SH ENVIRONMENT
-.PP
-.TP 8
-.B DISPLAY
-to get the default host and display number.
-.TP 8
-.B XENVIRONMENT
-to get the name of a resource file that overrides the global resources
-stored in the RESOURCE_MANAGER property.
-.SH SEE ALSO
-.BR X (1),
-.BR xscreensaver (1),
-.BR xlock (1)
-.SH COPYRIGHT
-Copyright \(co 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. 
-.SH AUTHOR
-Timo Korvola <tkorvola@dopey.hut.fi>, 1996.
-
-Ability to run standalone or with \fIxscreensaver\fP added by 
-Jamie Zawinski <jwz@netscape.com>, 10-May-97.