77 lines
1.3 KiB
Plaintext
77 lines
1.3 KiB
Plaintext
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:- object(brick,
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instantiates(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 'Two-dimensional brick (or should I say square?) class.']).
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:- public(position/2).
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:- mode(position(?integer, ?integer), zero_or_one).
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:- info(position/2, [
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comment is 'Brick current position.',
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argnames is ['X', 'Y']]).
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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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:- info(position_/2, [
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comment is 'Stores brick current position.',
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argnames is ['X', 'Y']]).
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:- public(move/2).
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:- mode(move(+integer, +integer), one).
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:- info(move/2, [
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comment is 'Moves a brick to a new position.',
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argnames is ['X', 'Y']]).
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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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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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::assertz(position_(X, Y)).
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process_init_option(Option) :-
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^^process_init_option(Option).
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valid_init_option(position-(X, Y)) :-
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!,
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integer(X),
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integer(Y).
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valid_init_option(Option) :-
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^^valid_init_option(Option).
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instance_base_name(b).
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:- end_object.
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