twang(6x) XScreenSaver manual twang(6x)
NAME
twang - pluck pieces of the screen
SYNOPSIS
twang [-display host:display.screen] [-foreground color] [-background
color] [-window] [-root] [-mono] [-install] [-visual visual] [-shm]
[-no-shm] [-delay usecs] [-duration secs] [-border-color color] [-bor-
der-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 mo-
tion 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.
-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, re-
source useSHM.
-delay microseconds
The interframe delay, in microseconds. Defaults to 10000, re-
source delay.
-duration seconds
How long to run before loading a new image. Default 120 sec-
onds.
-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, re-
source 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. De-
faults 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 itera-
tion. 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 to-
wards 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.
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 © 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, pro-
vided that the above copyright notice appear in all copies and that
both that copyright notice and this permission notice appear in sup-
porting documentation. No representations are made about the suitabil-
ity 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 5.45 (08-Dec-2020) twang(6x)
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