rocks man page

rocks — animation of flying through an asteroid field

Synopsis

rocks [-display host:display.screen] [-foreground color] [-background color] [-window] [-root] [-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.
-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.

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.

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.

Info

5.36-3.fc26 (21-Oct-2016) X Version 11 XScreenSaver manual