72 lines
1.2 KiB
Plaintext
72 lines
1.2 KiB
Plaintext
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:- object(polygon,
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instantiates(abstract_class),
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specializes(object)).
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:- info([
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version is 1.1,
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date is 2000/10/31,
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authors is 'Paulo Moura',
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comment is 'Polygon predicates.']).
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:- uses(list).
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:- public(move/2).
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:- mode(move(+integer, +integer), one).
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:- public(number_of_sides/1).
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:- mode(number_of_sides(?integer), zero_or_one).
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:- private(position_/2).
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:- dynamic(position_/2).
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:- mode(position_(?integer, ?integer), zero_or_one).
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:- public(position/2).
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:- mode(position(?integer, ?integer), zero_or_one).
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:- info([
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version is 2,
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date is 1998/2/23,
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authors is 'Paulo Moura',
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comment is 'Default protocol for all polygons.']).
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position(X, Y) :-
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::position_(X, Y).
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move(X, Y) :-
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::retractall(position_(_, _)),
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::assertz(position_(X, Y)).
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trans_x(X) :-
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::retractall(position_(_, Y)),
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::assertz(position_(X, Y)).
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trans_y(Y) :-
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::retractall(position_(X, _)),
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::assertz(position_(X, Y)).
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default_init_option(position-(0, 0)).
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default_init_option(Default) :-
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^^default_init_option(Default).
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process_init_option(position-(X, Y)) :-
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::move(X, Y).
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process_init_option(Option) :-
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^^process_init_option(Option).
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:- end_object.
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