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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 usecs]

DESCRIPTION
     The rd-bomb program draws reaction/diffusion textures.   The
     code is derived from the 'd' mode of the "bomb" visual musi-
     cal 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.

     -radius n
             Size of the seed.

     -palette n
             Selects a  palette.   Must  be  between  0  and  80,
             inclusive.

     -size f What fraction of the window  is  actively  drawn,  a
             floating  point  number  between 0 (exclusive) and 1
             (inclusive).  Default is 0.66.

     -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 usecs
             How  many  microseconds  to  delay  between  frames;
             default 1000, 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 O 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 docu-
     mentation.

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

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