Logtalk 2.26.2 files.

git-svn-id: https://yap.svn.sf.net/svnroot/yap/trunk@1487 b08c6af1-5177-4d33-ba66-4b1c6b8b522a

Logtalk/examples/bricks/bricks.lgt

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+
+:- object(brick,
+	instantiates(class),
+	specializes(object)).
+
+	:- info([
+		version is 1.1,
+		date is 2000/10/31,
+		author is 'Paulo Moura',
+		comment is 'Two-dimensional brick (or should I say square?) class.']).
+
+	:- public(position/2).
+	:- mode(position(?integer, ?integer), zero_or_one).
+	:- info(position/2, [
+		comment is 'Brick current position.',
+		argnames is ['X', 'Y']]).
+
+	:- private(position_/2).
+	:- dynamic(position_/2).
+	:- mode(position_(?integer, ?integer), zero_or_one).
+	:- info(position_/2, [
+		comment is 'Stores brick current position.',
+		argnames is ['X', 'Y']]).
+
+	:- public(move/2).
+	:- mode(move(+integer, +integer), one).
+	:- info(move/2, [
+		comment is 'Moves a brick to a new position.',
+		argnames is ['X', 'Y']]).
+
+	position(X, Y) :-
+		::position_(X, Y).
+
+	move(X, Y) :-
+		::retractall(position_(_, _)),
+		::assertz(position_(X, Y)).
+
+	default_init_option(position-(0, 0)).
+	default_init_option(Default) :-
+		^^default_init_option(Default).
+
+	process_init_option(position-(X, Y)) :-
+		::assertz(position_(X, Y)).
+	process_init_option(Option) :-
+		^^process_init_option(Option).
+
+	valid_init_option(position-(X, Y)) :-
+		!,
+		integer(X),
+		integer(Y).
+	valid_init_option(Option) :-
+		^^valid_init_option(Option).
+
+	instance_base_name(b).
+
+:- end_object.
+
+
+:- object(brick_stack,
+	instantiates(constrained_relation)).
+
+	:- info([
+		version is 1.0,
+		date is 1998/3/23,
+		author is 'Paulo Moura',
+		comment is 'Stack of bricks as a constrained binary relation.']).
+
+	descriptor_([top, bottom]).
+
+	domain_(top, brick).
+	domain_(bottom, brick).
+
+	key_([top, bottom]).
+
+	cardinality_(top, 0, 1).
+	cardinality_(bottom, 0, 1).
+
+	delete_option_(top, cascade).
+	delete_option_(bottom, restrict).
+
+	add_tuple([A, B]) :-
+		B::position(Xb, Yb),
+		Ya2 is Yb + 1,
+		{A::move(Xb, Ya2)},
+		^^add_tuple([A, B]).
+
+	activ_points_(top, before, []).
+	activ_points_(top, after, [move(_, _)]).
+
+	activ_points_(bottom, before, []).
+	activ_points_(bottom, after, [move(_, _)]).
+
+	propagate(after, move(X, Y), Top, top, [Top, Bottom]) :-
+		!,
+		Y2 is Y - 1,
+		(Bottom::position(X, Y2) ->
+			true
+			;
+			::remove_tuple([Top, Bottom])).
+
+	propagate(after, move(X, Y), Bottom, bottom, [Top, Bottom]) :-
+		!,
+		Y2 is Y + 1,
+		{Top::move(X, Y2)}.
+
+:- end_object.
+
+
+:- object(stack_monitor,
+	implements(event_handlersp)).
+
+	:- info([
+		version is 1.0,
+		date is 1998/3/23,
+		author is 'Paulo Moura',
+		comment is 'Monitor for brick movements printing an ascii representation of each brick position.']).
+
+	:- uses(loop).
+	:- uses(list).
+
+	after(_, move(_, _), _) :-
+		findall(
+			(Brick, X, Y),
+			(instantiates_class(Brick, brick), Brick::position(X, Y)),
+			Bricks),
+		setof(X, Brick^Y^ (list::member((Brick,X,Y), Bricks)), Xs),
+		list::last(Xs, Xmax),
+		setof(Y, Brick^X^ (list::member((Brick,X,Y), Bricks)), Ys),
+		list::last(Ys, Ymax),
+		loop::fordownto(Y, Ymax, 1,
+			(write('|'),
+			 loop::forto(X, 1, Xmax,
+        		(list::member((Brick, X, Y), Bricks) ->
+            		write(Brick)
+            		;
+            		write('.'))),
+			 nl)),
+		write('-'),
+		loop::forto(X, 1, Xmax, write('-')), nl.
+
+:- end_object.