Visit The New, Modern Unix Linux Community

Linux and UNIX Man Pages

Test Your Knowledge in Computers #680
Difficulty: Easy
Solaris was written in the C and C++ languages.
True or False?
Linux & Unix Commands - Search Man Pages

critical(1) [redhat man page]

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 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 ran- domly-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 val- ues 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 critical. 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 interacts 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 sup- porting 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)

Check Out this Related Man Page

XScreenSaver(1) 					      General Commands Manual						   XScreenSaver(1)

NAME
slip - sucks your screen into a jet engine SYNOPSIS
slip [-display host:display.screen] [-foreground color] [-background color] [-window] [-root] [-mono] [-install] [-visual visual] [-ncolors integer] [-iterations integer] [-points integer] [-delay microseconds] [-delay2 microseconds] DESCRIPTION
The slip program does lots of blits and chews up an image. The image that it manipulates will be grabbed from the portion of the screen underlying the window, or from the system's video input, or from a random file on disk, as indicated by the grabDesktopImages, grabVideoFrames, and chooseRandomImages options in the ~/.xscreensaver file; see xscreensaver-demo(1) for more details. OPTIONS
slip 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 128. The colors used cycle through the hue, making N stops around the color wheel. -count integer How many whooziwhatsis to generate. Default 35. -cycles integer How long to frobnicate. Default 50. -delay microseconds How long we should wait between drawing each step. Default 50000, or about 1/20th second. 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-demo(1), xscreensaver-getimage(1) COPYRIGHT
Copyright (C) 1992 by Scott Draves. 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
Scott Graves <spot@cs.cmu.edu>. Ability to run standalone or with xscreensaver added by Jamie Zawinski <jwz@jwz.org>, 18-Oct-93. X Version 11 24-Nov-97 XScreenSaver(1)

Featured Tech Videos