fluidballs - the physics of bouncing balls.

fluidballs [-display host:display.screen] [-visual visual] [-window] [-root] [-count number] [-size number] [-gravity number] [-wind number] [-elasticity number] [-delay number] [-nonrandom] [-no-shake] [-fps]

Models the physics of bouncing balls, or of particles in a gas or fluid, depending on the settings. If "Shake Box" is selected, then every now and then, the box will be rotated, changing which direction is down (in order to keep the settled balls in motion.)

-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.

-window

Draw on a newly-created window. This is the default.

-root

Draw on the root window.

-count number

How many balls to display. Default: 300.

-size number

Maximum size of each ball. Default: 25.

-gravity number

Coefficient of gravity. Useful values are < 0.1. Default: 0.01.

-wind number

Wind. Useful values are < 0.1. Default: 0.00.

-elasticity number

Coefficient of elasticity. Useful values are 0.2 to 1.0. Default: 0.97. Lower numbers make less bouncy balls.

-delay number

Per-frame delay, in microseconds. Default: 10000 (0.01 seconds.).

-nonrandom

Make all balls be the same size.

-no-nonrandom

Make the balls be random sizes. Default.

-shake | -no-shake

Whether to shake the box if the system seems to have settled down. "Shake" means "change the direction of Down."

-fps | -no-fps

Whether to show a frames-per-second display at the bottom of the screen.

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.

X(1), xscreensaver(1)

Copyright © 2002 by Peter Birtles and 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.

Peter Birtles, Jamie Zawinski, and Steven Barker.