=================================================================
Logtalk - Object oriented extension to Prolog
Release 2.21.4
Copyright (c) 1998-2004 Paulo Moura. All Rights Reserved.
To load all entities in this example compile and load the loader file:
| ?- logtalk_load(loader).
You will need to load the objects in the roots and relations examples.
You will also need to consult the following files in the library directory:
events_loader, types_loader, metapredicates_loader, and hierarchies_loader.
Alternatively, you may load the library all_loader file to load all library
entities.
In this example we have several types of polygons that can be concentric.
This is represented by a concentric binary relation ensuring that whenever
a polygon is moved towards a new position, all polygons likewise concentric
are moved along with them.
