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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] [-fps]
 

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. 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.  Sug-
                gested value: 1.0.
 
        -delay millisecs
                How  many  milliseconds  to delay between frames; default 1, or
                about 1/1000th of a second.
 
        -fps    Display the current frame rate and CPU load.
 

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