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RedHat 9 (Linux i386) - man page for fluidballs (redhat section 1)

XScreenSaver(1) 					      General Commands Manual						   XScreenSaver(1)

fluidballs - the physics of bouncing balls.
fluidballs [-display host:display.screen] [-visual visual] [-window] [-root] [-count number] [-size number] [-gravity number] [-wind num- ber] [-friction 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. -friction number Coefficient of friction (or viscosity.) Useful values are < 4. Default: 0.8. -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 (C) 2002 by Peter Birtles and Jamie Zawinski. Permission to use, copy, modify, distribute, and sell this software and its docu- mentation 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 and Jamie Zawinski. X Version 11 XScreenSaver(1)