NAME

       flow - strange attractors.

SYNOPSIS

       flow  [--display  host:display.screen]  [--visual visual] [--window] [--root] [--window-id
       number]     [--count     number]     [--cycles     number]      [--periodic|--no-periodic]
       [--search|--no-search]    [--rotate|--no-rotate]    [--ride|--no-ride]    [--box|--no-box]
       [--dbuf|--no-dbuf] [--ncolors number] [--delay number] [--fps]

DESCRIPTION

       Strange attractors formed of flows in a 3D differential equation  phase  space.   Features
       the  popular  attractors  described  by  Lorentz,  Roessler, Birkhoff and Duffing, and can
       discover entirely new attractors by itself.

OPTIONS

       --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.

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

       --root  Draw on the root window.

       --window-id number
               Draw on the specified window.

       --count number
               Number of particles in the flow.  Default: 3000

       --size number
               Length   of   particle   trails.    Negative   values  indicate  randomness.   The
               computational load of a given flow depends on (particle count) *  (trail  length).
               Default: -10

       --cycles number
               Timeout before changing objects.  0 - 800000.  Default: 10000.

       --periodic

       --no-periodic
               turn on/off periodic attractors.  These are flows in 2 dependent variables, with a
               periodic dependence  on  a  third  independent  variable  (eg  time).   Flow  will
               sometimes  choose  to  start all the particles in the same phase to illustrate the
               flow's cross-section.  Default: on

       --search

       --no-search
               turn on/off search for new attractors.  If this is  enabled,  a  fraction  of  the
               computing cycles is directed to searching a 60-dimensional parameter space for new
               strange attractors.  If periodic flows are enabled, these  can  be  searched  too.
               Watch carefully - you are quite likely to see mathematical objects that have never
               been seen before, and since the parameters are not recorded, you'll probably never
               see them again!  Default: on

       --rotate

       --no-rotate
               turn on/off rotating around attractor.  Default: on

       --ride

       --no-ride
               turn on/off ride in the flow.  Default: on

               If  both -rotate and -ride are enabled the viewpoint will occasionally fly between
               the two views.

       --box

       --no-box
               turn on/off bounding box.  Default: on

       --dbuf

       --no-dbuf
               turn on/off double buffering.  If Flow runs slowly in full screen, but fast  in  a
               smaller window (eg on old graphics cards with too little memory), try turning this
               option off.  Default: on

       --ncolors number
               Number of Colors.  Default: 200.

       --delay number
               Per-frame delay, in microseconds.  Default: 10000 (0.01 seconds.).

       --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.

       XSCREENSAVER_WINDOW
               The window ID to use with --root.

SEE ALSO

       X(1), xscreensaver(1)

COPYRIGHT

       Copyright (c) 1996 by Tim Auckland <Tim.Auckland@Procket.com> Incorporating some code from
       Stephen Davies Copyright (c) 2000

       Search code based on techniques described in "Strange  Attractors:  Creating  Patterns  in
       Chaos" by Julien C. Sprott

       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 documentation.

       This file is provided AS IS with no warranties of any kind.   The  author  shall  have  no
       liability  with respect to the infringement of copyrights, trade secrets or any patents by
       this file or any part thereof.  In no event will the author be liable for any lost revenue
       or profits or other special, indirect and consequential damages.

       Adapted from swarm.c Copyright (c) 1991 by Patrick J. Naughton.

       Adapted from xswarm by Jeff Butterworth. (butterwo@ncsc.org).

AUTHOR

       Tim Auckland