55 lines
1.0 KiB
Plaintext
55 lines
1.0 KiB
Plaintext
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:- object(bounded_history_point,
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imports(bounded_coordinate, point_history),
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instantiates(class),
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specializes(point)).
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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 point moving in a constrained area and remembering past point positions.',
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source is 'Example adopted from the SICStus Objects documentation.']).
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move(X, Y) :-
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::check_bounds(x, X),
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::check_bounds(y, Y),
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::position(OldX, OldY),
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^^move(X, Y),
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::add_to_history((OldX, OldY)).
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print :-
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::print_bounds(x),
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::print_bounds(y),
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::print_history,
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^^print.
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instance_base_name(bhp).
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default_init_option(history-[]).
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default_init_option(bounds(x)-(-10, 10)).
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default_init_option(bounds(y)-(-10, 10)).
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default_init_option(Default) :-
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^^default_init_option(Default).
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process_init_option(history-History) :-
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::init_history(History).
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process_init_option(bounds(Coordinate)-(Min, Max)) :-
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::set_bounds(Coordinate, Min, Max).
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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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