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XScreenSaver(1)						       XScreenSaver(1)

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]

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  200.
	       The colors are chosen randomly.

       -count integer
	       Default 12.

       -decay

       -no-ecay
	       Whether orbits should decay.

       -trail

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

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

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

X Version 11			   10-May-97		       XScreenSaver(1)
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