XScreenSaver(1)                                   XScreenSaver(1)


NNAAMMEE
       rd-bomb - reaction/diffusion textures

SSYYNNOOPPSSIISS
       rrdd--bboommbb [-display _h_o_s_t_:_d_i_s_p_l_a_y_._s_c_r_e_e_n] [-foreground _c_o_l_o_r]
       [-background _c_o_l_o_r] [-window] [-root] [-install]  [-visual
       _v_i_s_u_a_l]  [-width  _n] [-height _n] [-reaction _n] [-diffusion
       _n] [-size _f] [-speed _f] [-delay _u_s_e_c_s]

DDEESSCCRRIIPPTTIIOONN
       The _r_d_-_b_o_m_b  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.


OOPPTTIIOONNSS
       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".

       _r_d_-_b_o_m_b accepts the following options:

       --wwiinnddooww Draw on  a  newly-created  window.   This  is  the
               default.

       --rroooott   Draw on the root window.

       --iinnssttaallll
               Install a private colormap for the window.

       --vviissuuaall _v_i_s_u_a_l
               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.

       --wwiiddtthh _n

       --hheeiigghhtt _n
               Specify the size of the tile, in pixels.

       --rreeaaccttiioonn _n




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XScreenSaver(1)                                   XScreenSaver(1)


       --ddiiffffuussiioonn _n
               These  are  constants in the equations that effect
               its visual nature.  Each may be one of 0, 1, or 2.

       --rraaddiiuuss _n
               Size of the seed.

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

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

       --ssppeeeedd _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.

       --ddeellaayy _u_s_e_c_s
               How  many  microseconds  to  delay between frames;
               default 1000, or about 1/1000th of a second.

EENNVVIIRROONNMMEENNTT
       DDIISSPPLLAAYY to get the default host and display number.

       XXEENNVVIIRROONNMMEENNTT
               to get the name of a resource file that  overrides
               the  global  resources stored in the RESOURCE_MAN-
               AGER property.

SSEEEE AALLSSOO
       XX(1), xxssccrreeeennssaavveerr(1), xxlloocckk(1)

CCOOPPYYRRIIGGHHTT
       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.

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










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