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substrate - Grow crystal-like lines on a computational substrate
substrate [-display host:display.screen] [-foreground color]
[-background color] [-wireframe] [-max-cycles cyclecount]
[-growth-delay delayms] [-initial-cracks numinitial] [-max-cracks
nummax] [-sand-grains numgrains] [-circle-percent circlepercent] [-fps]
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
Ported from the code by j.tarbell at http://complexification.net
substrate accepts the following options:
-wireframe (Default: False)
Don't draw sand-painting colored effects, only make a
-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.
DISPLAY to get the default host and display number.
to get the name of a resource file that overrides the global
resources stored in the RESOURCE_MANAGER property.
Copyright (C) 2003 by J. Tarbell (email@example.com,
Ported to XScreensaver 2004 by Mike Kershaw
J. Tarbell <firstname.lastname@example.org>, Jun-03
Mike Kershaw <email@example.com>, Oct-04