Provided by: xscreensaver-data-extra_5.08-0ubuntu3_i386 bug
 

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.
        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.