XScreenSaver(1)                                                XScreenSaver(1)


       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  microseconds]  [-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 pro-


       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.

       -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.


       -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.

       -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 itera-
               tion.  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

       -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.


       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, pro-
       vided that the above copyright notice appear in  all  copies  and  that
       both  that  copyright  notice and this permission notice appear in sup-
       porting documentation. No representations are made about the  suitabil-
       ity  of  this  software for any purpose. It is provided "as is" without
       express or implied warranty.


       Dan Bornstein <>.

X Version 11                      07-Feb-2002                  XScreenSaver(1)

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