substrate

Section: XScreenSaver manual (6)
Updated: 5.40 (12-Aug-2018)
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NAME

substrate - Grow crystal-like lines on a computational substrate

SYNOPSIS

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]

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.

Ported from the code by j.tarbell at http://complexification.net

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.

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.

COPYRIGHT

Ported to XScreensaver 2004 by Mike Kershaw (dragorn@kismetwireless.net)

AUTHOR

J. Tarbell <complex@complexification.net>, Jun-03

Mike Kershaw <dragorn@kismetwireless.net>, Oct-04