ftp://ftp.smr.ru/pub/0/FreeBSD/releases/distfiles/xscreensaver-3.16.tar.gz

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

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-.TH XScreenSaver 1 "13-Nov-98" "X Version 11"
-.SH NAME
-critical - Draw a system showing self-organizing criticality
-.SH SYNOPSIS
-.B critical
-[\-display \fIhost:display.screen\fP] [\-foreground \fIcolor\fP] [\-background \fIcolor\fP] [\-window] [\-root] [\-mono] [\-install] [\-visual \fIvisual\fP] [\-delay \fIseconds\fP] [\-random \fIboolean\fP] [\-ncolors \fIint\fP] [\-offset \fIint\fP] 
-.SH DESCRIPTION
-The \fIcritical\fP program displays a self-organizing critical system
-that gradually emerges from chaos.
-
-\fIcritical\fP performs a simulation on a two-dimensional array of
-integers.  The array is initialized to random values.  On each
-iteration, it draws a line to the array position with the greatest
-value.  It then replaces that location and the eight neighboring
-locations with randomly-selected values.
-
-The lines are initially random, but over time a chaotic
-self-organizing system evolves: areas of the screen which happen to
-have lower values are less likely to be updated to new values, and so
-the line tends to avoid those areas.  Eventually, the histogram of
-changes approaches the power-law curve typical of such systems.
-
-The simplest documented self-organizing system is the one-dimensional
-equivalent of \fIcritical\fP.
-
-I heard about this algorithm second-hand: apparently there was an
-article in \fIScientific American\fP describing it sometime in 1997.
-.SH OPTIONS
-.I critical
-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 \-delay \fIusecs\fP
-Number of microseconds to wait after drawing each line.
-.TP 8
-.B \-random \fIboolean\fP
-Whether to use randomly selected colours rather than a cycle around
-the colour wheel.
-.TP 8
-.B \-offset \fIinteger\fP
-The maximum random radius increment to use.
-.TP 8
-.B \-ncolors \fIinteger\fP
-How many colors should be allocated in the color ramp (note that this
-value interacts with \fIoffset\fP.)
-.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 xscreensaver-command (1)
-.BR xscreensaver-demo (1)
-.SH COPYRIGHT
-Copyright \(co 1998 by Martin Pool.
-
-Permission to use, copy, modify, distribute, and sell this software
-and its documentation for any purpose is hereby granted without fee,
-provided that the above copyright notice appear in all copies and that
-both that copyright notice and this permission notice appear in
-supporting documentation.  No representations are made about the
-suitability of this software for any purpose.  It is provided "as is"
-without express or implied warranty.
-.SH AUTHOR
-Martin Pool <mbp@humbug.org.au>, 13-Nov-1998.  Based in part on the
-XScreenSaver code by Jamie Zawinski <jwz@jwz.org>.