twang
Section: XScreenSaver manual (6)
Updated: 5.40 (12-Aug-2018)
Page Index
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]
[-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.
- -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.
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, 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>.