XScreenSaver(1)

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
       musical                  instrument                   (see
       http://www.cs.cmu.edu/~spot/bomb.html).   I  got the equa-
       tions      from       xmorphia       (http://www.ccsf.cal-
       tech.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_MAN-
               AGER property.

SEE ALSO
       X(1) xscreensaver(1) xlock(1) 

COPYRIGHT
       Copyright (C) 1997 by Scott Draves.

       Permission to use, copy, modify, and distribute this soft-
       ware 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 lt;spot@cs.cmu.edu, 9/97