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RedHat 9 (Linux i386) - man page for critical (redhat section 1)

XScreenSaver(1) 		     General Commands Manual			  XScreenSaver(1)

NAME
       critical - Draw a system showing self-organizing criticality

SYNOPSIS
       critical  [-display host:display.screen] [-foreground color] [-background color] [-window]
       [-root] [-mono] [-install] [-visual visual] [-delay seconds] [-random  boolean]	[-ncolors
       int] [-offset int]

DESCRIPTION
       The  critical  program  displays  a self-organizing critical system that gradually emerges
       from chaos.

       critical performs a simulation on a two-dimensional array of integers.  The array is  ini-
       tialized  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 criti-
       cal.

       I  heard  about	this algorithm second-hand: apparently there was an article in Scientific
       American describing it sometime in 1997.

OPTIONS
       critical 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.

       -delay usecs
	       Number of microseconds to wait after drawing each line.

       -random boolean
	       Whether	to  use  randomly  selected colours rather than a cycle around the colour
	       wheel.

       -offset integer
	       The maximum random radius increment to use.

       -ncolors integer
	       How many colors should be allocated in the color ramp (note that this value inter-
	       acts with offset.)

       -trail integer
	       Length of the trail: between 5 and 100 is nice.

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) xscreensaver-command(1) xscreensaver-demo(1)

COPYRIGHT
       Copyright (C) 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.

AUTHOR
       Martin Pool <mbp@humbug.org.au>, 1998-2000.  Based in part on  the  XScreenSaver  code  by
       Jamie Zawinski <jwz@jwz.org>.

X Version 11				   08 Feb 2000				  XScreenSaver(1)


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