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NAME
     slidescreen - permute the screen image like an 8-puzzle

SYNOPSIS
     slidescreen  [-display   host:display.screen]   [-background
     color] [-grid-size pixels] [-ibw pixels] [-increment pixels]
     [-delay usecs] [-delay2 usecs] [-window] [-root]  [-install]
     [-visual visual]

DESCRIPTION
     The slidescreen  program  takes  an  image  of  the  screen,
     divides  it  into  a  grid,  deletes a random square of that
     grid, and then randomly slides one of the neighbors of  this
     "hole" into the hole (and repeat.)

OPTIONS
     slidescreen accepts the following options:

     -window Draw  on  a  newly-created  window.   This  is   the
             default.

     -root   Draw on the root window.

     -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.

     -grid-size pixels
             The size of the grid cells.  Default 70 pixels.

     -ibw pixels
             The  size  of  the  "gutter"  between  grid   cells.
             Default 1 pixel.

     -increment pixels
             How many pixels by which a  piece  should  be  moved
             when sliding to a new location.  Default 10 pixels.

     -delay microseconds
             How much of a delay  should  be  introduced  between
             steps  of  the  animation of the motion of each seg-
             ment.  Default 50000, which is 0.05  seconds.   This
             is closely related to the -increment parameter.

     -delay microseconds
             How much of a delay should be introduced between the
             end  of  the motion of one segment and the beginning
             of the motion of another.  Default 1000000, which is
             one second.

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 O 1992 by  Jamie  Zawinski.   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  permis-
     sion   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
     Jamie Zawinski <jwz@jwz.org>, 3-dec-92.

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