grav

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)