twang(6) XScreenSaver manual twang(6)

NAME

twang - pluck pieces of the screen

SYNOPSIS

twang [--display host:display.screen] [--foreground color]
[--background color] [--window] [--root] [--window-id number]
[--mono] [--install] [--visual visual] [--shm] [--no-shm] [--delay
usecs] [--duration secs] [--border-color color] [--border-width
integer] [--event-chance fraction] [--friction fraction]
[--springiness fraction] [--tile-size integer] [--transference
fraction] [--fps]

DESCRIPTION

Twang divides the screen into equal-sized tiles, and then plucks them
in various ways. Tiles are affected by their neighbors, so waves of
motion flow through the grid. This manpage describes v1.3 of the
program.

OPTIONS

twang accepts the following options:

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

--root Draw on the root window.

--window-id number
Draw on the specified window.

--mono If on a color display, pretend we're on a monochrome display.

--install
Install a private colormap for the window.

--visual visual
Which visual to use. Legal values are the name of a visual
class, or the id number (decimal or hex) of a specific
visual.

--shm

--no-shm
Use the shared memory extension (or not, respectively), if
available. This may speed things up a bit, but probably
won't make that much difference. If available, defaults to
true, resource useSHM.

--delay microseconds
The interframe delay, in microseconds. Defaults to 10000,
resource delay.

--duration seconds
How long to run before loading a new image. Default 120
seconds.

--border-color color
Color of the border surrounding each tile. Defaults to blue,
resource borderColor.

--border-width integer
Width of the border surrounding each tile. Defaults to 3,
resource borderWidth.

--event-chance fraction
The chance, per iteration, for an event to occur (such as
tweaking the orientation of a tile), in the range 0..1.
Defaults to 0.01, resource eventChance.

--friction fraction
How much friction there is in the system, in the range 0..1.
This is the amount by which velocities are damped per
iteration. Defaults to 0.05, resource friction.

--springiness fraction
How springy the tiles are, in the range 0..1. This is the
fraction of an orientation that gets turned into a velocity
towards the center (resting point). Defaults to 0.1, resource
springiness.

--tile-size integer
Size (width and height) of each tile, not including the outer
edge of the border. Defaults to 120, resource tileSize.

--transference fraction
How much a tile's neighbors affect it, in the range 0..1.
This is the fraction of an orientation of a neighbor that
gets turned into a velocity in the same direction Defaults to
0.025, resource transference.

--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.

XSCREENSAVER_WINDOW
The window ID to use with --root.

X RESOURCES

There are resource equivalents for each option, noted above.

BUGS

twang should have more interesting events.

Ways of speeding it up need to be investigated. It's kinda sluggish,
especially on hugeass displays.

SEE ALSO

xscreensaver(1)

COPYRIGHT

Copyright (C) 2002 by Dan Bornstein. All rights reserved.

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

Dan Bornstein <danfuzz@milk.com>.

X Version 11 6.09 (07-Jun-2024) twang(6)