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NAME

       Eruption.

SYNOPSIS

       Eruption  [-display  host:display.screen]  [-visual  visual]  [-window]
       [-root] [-ncolors number] [-nParticles number] [-Heat number] [-Cooling
       number] [-Gravity number] [-delay number] [-cycles number] [-fps]

DESCRIPTION

       This  hack  creates an eruption of pieces of hot volcanic rock.  Ported
       from the demo effects collection (http://demo-effects.sourceforge.net)

OPTIONS

       -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.

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

       -root   Draw on the root window.

       -ncolors number
               Number of Colors.  Default: 256.

       -particles number
               Number of Particles. Default: 300.

       -cooloff number
               Eruption Cooloff. Default: 2.

       -heat number
               Heat of Eruption. Default: 256.

       -gravity number
               Gravity. Default: 1.

       -delay number
               Per-frame  delay,  in  microseconds.    Default:   5000   (0.01
               seconds.).

       -cycles number
               Duration.  10 - 3000.  Default: 80.

       -fps    Display the current frame rate and CPU load.

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 © 2002-2003 by W.P. van Paassen.  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 permission 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

       W.P. van Paassen