twang man page

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)

Author

Dan Bornstein <danfuzz@milk.com>.

Info

5.36-3.fc26 (21-Oct-2016) X Version 11 XScreenSaver manual