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NAME

       grav - draws a simple orbital simulation

SYNOPSIS

       grav  [-display  host:display.screen]  [-foreground color] [-background
       color] [-window] [-root] [-mono] [-install] [-visual visual]  [-ncolors
       integer]  [-delay  microseconds]  [-count integer] [-decay] [-no-decay]
       [-trail] [-no-trail]

       [-fps]

DESCRIPTION

       The grav program draws a simple orbital simulation

OPTIONS

       grav accepts the following options:

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

       -root   Draw on the root window.

       -mono   If on a color display, pretend we're on a monochrome display.

       -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.

       -ncolors integer
               How many colors should be used (if possible).  Default 64.  The
               colors are chosen randomly.

       -count integer
               Default 12.

       -decay

       -no-decay
               Whether orbits should decay.

       -trail

       -no-trail
               Whether  the  objects should leave trails behind them (makes it
               look vaguely like a cloud-chamber.

       -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.

SEE ALSO

       X(1), xscreensaver(1), xlock(1)

COPYRIGHT

       Copyright (C) 1993 by Greg Bowering.

       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.

AUTHOR

       Greg Bowering <gb@pobox.com>, 1993.

       Ability  to run standalone or with xscreensaver added by Jamie Zawinski
       <jwz@jwz.org>, 10-May-97.