71 lines
1.4 KiB
Plaintext
71 lines
1.4 KiB
Plaintext
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:- category(bounded_coordinate).
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:- info([
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version is 1.0,
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date is 1998/3/23,
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authors is 'Paulo Moura',
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comment is 'Point coordinate bounds management predicates.',
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source is 'Example adopted from the SICStus Objects documentation.']).
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:- public(set_bounds/3).
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:- mode(set_bounds(+atom, +integer, +integer), one).
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:- public(clear_bounds/1).
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:- mode(clear_bounds(+atom), one).
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:- public(bounds/3).
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:- mode(bounds(?atom, ?integer, ?integer), zero_or_more).
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:- public(check_bounds/2).
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:- mode(check_bounds(+atom, +integer), zero_or_one).
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:- public(print_bounds/1).
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:- mode(print_bounds(?atom), zero_or_more).
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:- public(valid_value/2).
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:- mode(valid_value(+atom, +integer), zero_or_one).
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:- private(bounds_/3).
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:- dynamic(bounds_/3).
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:- mode(bounds_(?atom, ?integer, ?integer), zero_or_more).
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set_bounds(Coordinate, Min, Max) :-
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::retractall(bounds_(Coordinate, _, _)),
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::assertz(bounds_(Coordinate, Min, Max)).
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clear_bounds(Coordinate) :-
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::retractall(bounds_(Coordinate, _, _)).
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bounds(Coordinate, Min, Max) :-
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::bounds_(Coordinate, Min, Max).
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check_bounds(Coordinate, Value) :-
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::bounds_(Coordinate, Min, Max),
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Value >= Min,
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Value =< Max.
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print_bounds(Coordinate) :-
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::bounds_(Coordinate, Min, Max),
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writeq(bounds(Coordinate)),
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write(' : '),
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write((Min, Max)),
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nl.
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valid_value(Coordinate, Value) :-
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::bounds_(Coordinate, Min, Max) ->
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Value >= Min, Value =< Max
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;
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true.
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:- end_category.
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