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twang - pluck pieces of the screen
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]
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
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 a private colormap for the window.
Which visual to use. Legal values are the name of a visual
class, or the id number (decimal or hex) of a specific visual.
-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,
The interframe delay, in microseconds. Defaults to 10000,
How long to run before loading a new image. Default 120
Color of the border surrounding each tile. Defaults to blue,
Width of the border surrounding each tile. Defaults to 3,
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.
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.
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
Size (width and height) of each tile, not including the outer
edge of the border. Defaults to 120, resource tileSize.
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,
-fps Display the current frame rate and CPU load.
DISPLAY to get the default host and display number.
to get the name of a resource file that overrides the global
resources stored in the RESOURCE_MANAGER property.
There are resource equivalents for each option, noted above.
twang should have more interesting events.
Ways of speeding it up need to be investigated. It’s kinda sluggish,
especially on hugeass displays.
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.
Dan Bornstein <email@example.com>.