Home
Main website
Display Sidebar
Hide Ads
Recent Changes
View Source:
critical(1)
Edit
PageHistory
Diff
Info
LikePages
XScreenSaver !!!XScreenSaver NAME SYNOPSIS DESCRIPTION OPTIONS ENVIRONMENT SEE ALSO COPYRIGHT AUTHOR ---- !!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 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 ''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 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 !!AUTHOR Martin Pool ----
2 pages link to
critical(1)
:
xscreensaver(1)
Man1c
This page is a man page (or other imported legacy content). We are unable to automatically determine the license status of this page.
