XScreenSaver(1) 					      General Commands Manual						   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 (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, 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)