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XScreenSaver(6x)                                              XScreenSaver(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
       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 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
               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.  Sug-
               gested 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 (C) 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 <spotATcs.edu>, 9/97



X Version 11                  4.21 (01-Mar-2005)              XScreenSaver(6x)