55 lines
765 B
Plaintext
55 lines
765 B
Plaintext
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:- object(colours,
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implements(comparingp)).
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:- info([
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authors is 'Paulo Moura',
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version is 1.0,
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date is 2000/4/22,
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comment is 'Implements comparison between visible colors.']).
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Colour1 < Colour2 :-
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order(Colour1, N1),
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order(Colour2, N2),
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{N1 < N2}.
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Colour1 =< Colour2 :-
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order(Colour1, N1),
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order(Colour2, N2),
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{N1 =< N2}.
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Colour1 > Colour2 :-
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order(Colour1, N1),
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order(Colour2, N2),
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{N1 > N2}.
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Colour1 >= Colour2 :-
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order(Colour1, N1),
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order(Colour2, N2),
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{N1 >= N2}.
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Colour1 =:= Colour2 :-
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{Colour1 == Colour2}.
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Colour1 =\= Colour2 :-
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{Colour1 \== Colour2}.
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order(red, 1).
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order(orange, 2).
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order(yellow, 3).
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order(green, 4).
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order(blue, 5).
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order(indigo, 6).
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order(violet, 7).
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:- end_object.
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