rocks(6) XScreenSaver manual rocks(6)

NAME

rocks - animation of flying through an asteroid field

SYNOPSIS

rocks [--display host:display.screen] [--foreground color]
[--background color] [--window] [--root] [--window-id number][--mono]
[--ncolors n] [--install] [--visual visual] [--count integer]
[--delay usecs] [--speed integer] [--norotate] [--nomove] [-3d]
[--fps]

DESCRIPTION

The rocks program draws an animation of an asteroid field moving past
the observer (or vice versa). Sometimes the observer picks up spin
on Z axis.

OPTIONS

rocks 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 Make all the rocks the same color.

--ncolors colors
How many different colors to use. Default 5. Colors are
chosen randomly.

--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.

--count integer
Maximum number of rocks to draw on the screen at once.
Default 100.

--speed integer
A measure of the speed with which the observer and the rocks
pass each other, from 1 to 100. Default 100, meaning ``very
fast.'' If you're on a slow display connection (the
animation looks jerky) then try making this number smaller,
and/or decreasing the number of rocks.

--delay microseconds
Number of microseconds to delay between each frame. Default
50000, meaning about 1/20th second. Compare and contrast
with --speed, above.

--norotate
Don't rotate the observer; just fly through the field on the
level.

--nomove
Don't turn the observer; just fly straight ahead through the
field.

-3d Do red/blue 3d separations: if you look at the screen with 3d
glasses, the rocks will be jumping right out at you. Oooooh,
scaaary!

--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)

BUGS

There should be an option to display doppler shift (a gravity
rainbow.)

Speed of rotation should be settable.

Default speed of rotation should be relative to forward velocity.

COPYRIGHT

Copyright (C) 1992 by Jamie Zawinski. Permission to use, copy,
modify, distribute, and sell this software and its documentation for
any purpose is hereby granted without fee, provided that the above
copyright notice appear in all copies and that both that copyright
notice and this permission notice appear in supporting documentation.
No representations are made about the suitability of this software
for any purpose. It is provided "as is" without express or implied
warranty.

AUTHOR

Based on Lisp Machine code copyright 1988 John Nguyen
<johnn@hx.lcs.mit.edu>.

Ported to C and X by Jamie Zawinski <jwz@jwz.org>, 13-aug-92.

Steering code by Jeremie Petit; 3D code by theiling@coli.uni-sb.de.

X Version 11 6.09 (07-Jun-2024) rocks(6)