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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>.