Include Paulo Moura's Logtalk OO LP system

git-svn-id: https://yap.svn.sf.net/svnroot/yap/trunk@53 b08c6af1-5177-4d33-ba66-4b1c6b8b522a

Logtalk/examples/polygons/concentric.lgt

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+
+:- object(concentric,
+	instantiates(constrained_relation)).
+
+
+	:- info([
+		version is 1.0,
+		date is 1998/3/23,
+		authors is 'Paulo Moura',
+		comment is 'Concentric polygons as a constrained binary relation.']).
+
+
+	:- uses(list).
+
+
+	descriptor_([x1, x2]).
+
+
+	domain_(x1, polygon).
+	domain_(x2, polygon).
+
+
+	key_([x1, x2]).
+
+
+	cardinality_(x1, 0, n).
+	cardinality_(x2, 0, n).
+
+
+	delete_option_(x1, cascade).
+	delete_option_(x2, cascade).
+
+
+	add_tuple([Polygon| Polygons]) :-
+		Polygon::position(X, Y),
+		forall(list::member(Polygon2, Polygons), {Polygon2::move(X, Y)}),
+		^^add_tuple([Polygon| Polygons]).
+
+
+	activ_points_(x1, before, []).
+	activ_points_(x1, after, [move(_, _), transX(_), transY(_)]).
+
+	activ_points_(x2, before, []).
+	activ_points_(x2, after, [move(_, _), transX(_), transY(_)]).
+
+
+	propagate(after, move(X, Y), Polygon, _, Tuple) :-
+		list::select(Polygon, Tuple, Polygons),
+		!,
+		forall(
+			(list::member(Polygon2, Polygons),\+ Polygon2::position(X, Y)),
+			{Polygon2::move(X, Y)}).
+
+	propagate(after, transX(X), Polygon, _, Tuple) :-
+		list::select(Polygon, Tuple, Polygons),
+		!,
+		forall(
+			(list::member(Polygon2, Polygons), \+ Polygon2::position(X, _)),
+			{Polygon2::transX(X)}).
+
+	propagate(after, transY(Y), Polygon, _, Tuple) :-
+		list::select(Polygon, Tuple, Polygons),
+		!,
+		forall(
+			(list::member(Polygon2, Polygons), \+ Polygon2::position(_, Y)),
+			{Polygon2::transY(Y)}).
+
+
+:- end_object.