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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]

DESCRIPTION

       The rd-bomb program draws reaction/diffusion  textures.   The  code  is
       derived  from the ’d’ mode of the "bomb" visual musical instrument (see
       http://www.cs.cmu.edu/~spot/bomb.html).   I  got  the  equations   from
       xmorphia (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
       appropriate 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
               nature.  Each may be one of 0, 1, or 2. Default  is  -1:  these
               constants 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.
               Suggested value: 1.0.

       -delay millisecs
               How  many  milliseconds  to delay between frames; default 1, or
               about 1/1000th of a 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), 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,
       provided  that the above copyright notice appear in all copies and that
       both that  copyright  notice  and  this  permission  notice  appear  in
       supporting documentation.

AUTHOR

       Scott Draves <spot@cs.cmu.edu>, 9/97