NAME

       substrate - Grow crystal-like lines on a computational substrate

SYNOPSIS

       substrate  [--display  host:display.screen]  [--visual  visual]  [--window] [--root] [--window-id number]
       [--foreground  color]  [--background  color]  [--wireframe]  [--max-cycles  cyclecount]   [--growth-delay
       delayms]  [--initial-cracks numinitial] [--max-cracks nummax] [--sand-grains numgrains] [--circle-percent
       circlepercent] [--fps]

DESCRIPTION

       Lines like crystals grow on a computational  substrate.   A  simple  perpendicular  growth  rule  creates
       intricate  city-like  structures.   Optionally,  cracks  may also be circular, producing a cityscape more
       familiar to places for which city planning is a distant, theoretical concern.

OPTIONS

       substrate accepts the following options:

       --wireframe (Default: False)
               Don't draw sand-painting colored effects, only make a wireframe.

       --max-cycles cyclecount (Default: 10000)
               Maximum number of growth cycles before restarting.  The higher this is, the more complex the art.

       --growth-delay delayms (Default: 18000)
               Delay in ms between growth cycles.  More delay, slower (but smoother and less CPU intensive) art.

       --initial-cracks numinitial (Default: 3)
               Initial number of cracks in the substrate

       --max-cracks nummax (Default: 100)
               Maximum number of cracks in the substrate at a single time

       --sand-grains numgrains (Default: 64)
               Number of sand grains dropped during coloring.  More grains cause a denser colour  but  use  more
               cpu power.

       --circle-percent circlepercent (Default: 0)
               The percentage of the cracks will be circular.

       --fps   Display the current frame rate and CPU load.

       --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.

       --window-id number
               Draw on the specified window.

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.

       XSCREENSAVER_WINDOW
               The window ID to use with --root.

SEE ALSO

       X(1), xscreensaver(1)

COPYRIGHT

       Copyright © 2003 by J. Tarbell <complex@complexification.net>.
       XScreenSaver port: Mike Kershaw <dragorn@kismetwireless.net>

AUTHOR

       J. Tarbell <complex@complexification.net>, Jun 2003.
       Mike Kershaw <dragorn@kismetwireless.net>, Oct 2004.