rd-bomb(6x) XScreenSaver manual rd-bomb(6x)
NAME
rd-bomb - reaction/diffusion textures
SYNOPSIS
rd-bomb [-display host:display.screen] [-foreground color] [-background
color] [-window] [-root] [-install] [-visual visual] [-width n]
[-height n] [-reaction n] [-diffusion n] [-size f] [-speed f] [-delay
millisecs] [-fps]
DESCRIPTION
The rd-bomb program draws reaction/diffusion textures. The code is de-
rived from the 'd' mode of the "bomb" visual musical instrument (see
http://www.cs.cmu.edu/~spot/bomb.html). I got the equations from xmor-
phia (http://www.ccsf.caltech.edu/ismap/image.html), which is based on
a version of the Gray-Scott model taken from:
John E. Pearson "Complex Patterns in a Simple System"
Science, 261,189, 9 July 1993.
If the frame-rate is too low, consider decreasing the width and height
of the tile, or decreasing the size of the active part of the screen.
OPTIONS
If one of the reaction, diffusion, radius, and palette options is set
to a negative value, then that option will be set to a random appropri-
ate value.
Be sure to try "-speed 1 -size 0.1 -epoch 3000".
rd-bomb accepts the following options:
-window Draw on a newly-created window. This is the default.
-root Draw on the root window.
-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.
-width n
-height n
Specify the size of the tile, in pixels.
-reaction n
-diffusion n
These are constants in the equations that effect its visual na-
ture. Each may be one of 0, 1, or 2. Default is -1: these con-
stants are chosen randomly.
-radius n
Size of the seed.
-size f What fraction of the window is actively drawn, a floating point
number between 0 (exclusive) and 1 (inclusive). Default is
1.0.
-speed f
When a fraction of the screen is active, the active area moves
at this rate (a floating point number). Default is zero. Sug-
gested value: 1.0.
-delay millisecs
How many milliseconds to delay between frames; default 1, or
about 1/1000th of a second.
-fps Display the current frame rate and CPU load.
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), xlock(1)
COPYRIGHT
Copyright © 1997 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 Draves <spot@cs.cmu.edu>, 9/97
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