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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>.