1rd-bomb(6x)                   XScreenSaver manual                  rd-bomb(6x)
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NAME

6       rd-bomb - reaction/diffusion textures
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SYNOPSIS

9       rd-bomb [-display host:display.screen] [-foreground color] [-background
10       color]  [-window]  [-root]  [-install]  [-visual  visual]  [-width   n]
11       [-height  n]  [-reaction n] [-diffusion n] [-size f] [-speed f] [-delay
12       millisecs]
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DESCRIPTION

15       The rd-bomb program draws reaction/diffusion  textures.   The  code  is
16       derived  from the 'd' mode of the "bomb" visual musical instrument (see
17       http://www.cs.cmu.edu/~spot/bomb.html).  I got the equations from xmor‐
18       phia  (http://www.ccsf.caltech.edu/ismap/image.html), which is based on
19       a version of the Gray-Scott model taken from:
20           John E. Pearson "Complex Patterns in a Simple System"
21           Science, 261,189, 9 July 1993.
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23       If the frame-rate is too low, consider decreasing the width and  height
24       of the tile, or decreasing the size of the active part of the screen.
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OPTIONS

28       If  one  of the reaction, diffusion, radius, and palette options is set
29       to a negative value, then that option will be set to a random appropri‐
30       ate value.
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32       Be sure to try "-speed 1 -size 0.1 -epoch 3000".
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34       rd-bomb accepts the following options:
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36       -window Draw on a newly-created window.  This is the default.
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38       -root   Draw on the root window.
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40       -install
41               Install a private colormap for the window.
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43       -visual visual
44               Specify  which  visual  to use.  Legal values are the name of a
45               visual class, or the id number (decimal or hex) of  a  specific
46               visual.
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48       -width n
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50       -height n
51               Specify the size of the tile, in pixels.
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53       -reaction n
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55       -diffusion n
56               These  are  constants  in  the equations that effect its visual
57               nature.  Each may be one of 0, 1, or 2. Default  is  -1:  these
58               constants are chosen randomly.
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60       -radius n
61               Size of the seed.
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63       -size f What fraction of the window is actively drawn, a floating point
64               number between 0 (exclusive) and  1  (inclusive).   Default  is
65               1.0.
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67       -speed f
68               When  a fraction of the screen is active, the active area moves
69               at this rate (a floating point number).  Default is zero.  Sug‐
70               gested value: 1.0.
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72       -delay millisecs
73               How  many  milliseconds  to delay between frames; default 1, or
74               about 1/1000th of a second.
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ENVIRONMENT

77       DISPLAY to get the default host and display number.
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79       XENVIRONMENT
80               to get the name of a resource file that  overrides  the  global
81               resources stored in the RESOURCE_MANAGER property.
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SEE ALSO

84       X(1), xscreensaver(1), xlock(1)
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87       Copyright © 1997 by Scott Draves.
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89       Permission  to  use, copy, modify, and distribute this software and its
90       documentation for any purpose and without fee is hereby  granted,  pro‐
91       vided  that  the  above  copyright notice appear in all copies and that
92       both that copyright notice and this permission notice  appear  in  sup‐
93       porting documentation.
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AUTHOR

96       Scott Draves <spot@cs.cmu.edu>, 9/97
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100X Version 11                 5.05-3 (06-Apr-2008)                  rd-bomb(6x)
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