boing
Section: XScreenSaver manual (6)
Updated: 5.40 (12-Aug-2018)
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NAME
boing - draws a bouncing ball like the ancient Amiga demo
SYNOPSIS
boing
[-display
host:display.screen] [-window] [-root] [-install]
[-visual
visual]
[-delay
usecs]
[-smooth]
[-lighting]
[-scanlines]
[-speed]
[-no-spin]
[-angle
degrees]
[-size
ratio]
[-parallels
n]
[-meridians
n]
[-wireframe]
[-fps]
DESCRIPTION
The
boing program draws a bouncing checkered ball on a grid.
This is a clone of the first graphics demo for the Amiga 1000, which
was written by Dale Luck and RJ Mical during a break at the 1984
Consumer Electronics Show (or so the legend goes.) The boing ball was
briefly the official logo of Amiga Inc., until they were bought by
Commodore later that year.
With no arguments, this program looks a lot like the original Amiga
demo. With "-smooth -lighting", it looks... less old.
OPTIONS
boing
accepts the following options:
- -window
-
Draw on a newly-created window. This is the default.
- -root
-
Draw on the root window.
- -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.
- -delay usecs
-
The delay between frames of the animation, in microseconds: default 15000.
- -smooth
-
Draw a smooth sphere instead of a faceted polyhedron.
- -lighting
-
Do shaded lighting instead of flat colors.
- -scanlines
-
If the window is large enough, draw horizontal lines to simulate the
scanlines on a low resolution monitor.
- -speed ratio
-
Change the animation speed; 0.5 to go half as fast, 2.0 to go twice as fast.
- -no-spin
-
Don't rotate the ball.
- -angle degrees
-
The jaunty angle at which the ball sits. Default 15 degrees.
- -size ratio
-
How big the ball is; default 0.5 meaning about half the size of the window.
- -parallels n
-
-meridians n
The pattern of rectangles on the ball. Default 8x16.
- -wireframe
-
Look crummy.
- -fps
-
Display the current frame rate, CPU load, and polygon count.
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
bsod(6),
pong(6),
xscreensaver(1),
X(1)
COPYRIGHT
Copyright © 2005 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
Jamie Zawinski <
jwz@jwz.org>, 19-Feb-2005.