anemotaxis



XScreenSaver(1)                                                XScreenSaver(1)




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 ear-
       lier  (local  wind direction). The program paints sources and particles
       released by them as well as trajectories of serchers 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 sec-
               onds.).

       -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 copy-
       right notice appear in all copies and that both that  copyright  notice
       and this permission notice appear in supporting documentation.  No rep-
       resentations are made about the suitability of this  software  for  any
       purpose.  It is provided "as is" without express or implied warranty.


AUTHOR

       Eugene Balkovsky



X Version 11                                                   XScreenSaver(1)

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