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anemotaxis

Section: XScreenSaver manual (6)
Updated: 5.04 (13-Nov-2007)
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NAME

anemotaxis - directional search on a plane.  

SYNOPSIS

anemotaxis [-display host:display.screen] [-visual visual] [-window] [-root] [-delay number] [-distance number] [-sources number] [-searchers number]  

DESCRIPTION

The program demonstrates a search algorithm designed for locating a source of odor in turbulent atmosphere. The odor is convected by wind which has a constant mean direction and fluctuations around it. The searcher is able to sense the odor and determine local instantaneous wind direction. The goal is to find the source in the shortest mean time. Some animals face this task to find mates, food, home etc. They exhibit very particular, zigzagging search trajectories.

This is modeled as a search on a discrete two-dimensional lattice. The source releases particles that drift with constant velocity in one direction and walk randomly in the other direction. The searcher knows if it hit a particle, and if so, particle's position one time step earlier (local wind direction). The program paints sources and particles released by them as well as trajectories of searchers who are trying to capture the sources.  

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.
-delay number
Per-frame delay, in microseconds. Default: 20000 (0.02 seconds.).
-distance number
Max initial distance to the source . 10 - 250. Default: 40.
-sources number
Max number of sources. Default: 25.
-searchers number
Max number of searchers. Default: 25.

 

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 © 2004 by Eugene Balkovsky. 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

Eugene Balkovsky


 

Index

NAME
SYNOPSIS
DESCRIPTION
OPTIONS
ENVIRONMENT
SEE ALSO
COPYRIGHT
AUTHOR