NAME¶

grav - draws a simple orbital simulation

SYNOPSIS¶

grav [--display host:display.screen] [--foreground color] [--background color] [--window] [--root] [--window-id number][--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.

--window-id number

Draw on the specified 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.

XSCREENSAVER_WINDOW

The window ID to use with --root.

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, 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.