XScreenSaver(1)

NAME
       decayscreen - make a screen meltdown.

SYNOPSIS
       decayscreen   [-display   host:display.screen]   [-window]
       [-root] [-mono] [-install] [-visual visual] [-delay usecs]
       [-mode mode]

DESCRIPTION
       The  decayscreen  program creates a melting effect by ran-
       domly shifting rectangles around the screen.

OPTIONS
       decayscreen 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
               Specify which visual to use.  Legal values are the
               name  of a visual class, or the id number (decimal
               or hex) of a specific visual.

       -delay microseconds
               Slow it down.

       -mode mode
               The direction in which the image  should  tend  to
               slide.   Legal  values  are  random  (meaning pick
               one), up, left,  right,  down,  upleft,  downleft,
               upright,  downright,  shuffle  (meaning  perfer no
               particular direction),  in  (meaning  move  things
               toward  the  center),  and out (meaing move things
               away from the center).

RESOURCES
       On some systems (currently, only SGIs), this program  can,
       instead of grabbing a desktop image, grab a frame of video
       from an external camera and manipulate that instead.   The
       following resources control that.

       grabVideoProbability (Float)
               What portion of the time to grab video rather than
               a screen image, between 0.0 and 1.0.  Defaults  to
               0.5, or half the time.

       videoDevice (Integer)
               The  number  of  the default video input device to
               check first.  If unspecified, the  default  camera
               (from videopanel(1)) will be checked first.  After
               that, all other available video input devices will
               be checked in order.
               The  first  one  which  produces a non-black image
               will be used.  If all images are black, the others
               will  be  re-checked  a few times before giving up
               and falling back  to  simply  grabbing  a  desktop
               image  (but note that this takes a few seconds, so
               if you  don't  actually  have  any  video  sources
               hooked  up,  you should consider turning off video
               grabbing by setting grabVideoProbability to  0.0.)

       videoGain (Float)
               The amount by which to brighten the grabbed image.
               This defaults to 2.2.

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_MAN-
               AGER property.

SEE ALSO
       X(1) xscreensaver(1) 

COPYRIGHT
       Copyright 1992 by Vivek Khera.  Permission to  use,  copy,
       modify,  distribute,  and sell this software and its docu-
       mentation 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  per-
       mission  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
       Vivek Khera lt;khera@cs.duke.edu, 05-Aug-93; based on  code
       by David Wald, 1988.  Modified by jwz, 28-Nov-97.