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.