decayscreen man page on DigitalUNIX

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XScreenSaver(1)						       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  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 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  grabVideoProba‐
	       bility 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, dis‐
       tribute, 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  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  <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.

X Version 11			  05-Apr-1999		       XScreenSaver(1)
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