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

5.36-4.fc26 (10-Feb-2017) X Version 11 XScreenSaver manual