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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 randomly
     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),  out  (meaning  move  things  away from the
             center), melt (meaning melt straight downward),  and
             stretch (meaning stretch the screen downward).

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  fal-
             ling  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  set-
             ting 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_MANAGER
             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 documen-
     tation 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 supporting documentation.  No representa-
     tions are made about the suitability of  this  software  for
     any  purpose.   It  is  provided  "as is" without express or
     implied warranty.

AUTHOR
     Vivek Khera <khera@cs.duke.edu>, 05-Aug-93; based on code by
     David  Wald, 1988.  Modified by jwz, 28-Nov-97.  Modified by
     Rick Schultz <rick@skapunx.net> 05-Apr-1999.

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