49 lines
837 B
Plaintext
49 lines
837 B
Plaintext
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:- object(circle(Radius, Color),
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extends(ellipse(Radius, Radius, Color))).
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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 'Parametric object for representing geometric circles.',
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parnames is ['Radius', 'Color'],
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source is 'Example adopted from the SICStus Objects documentation.']).
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:- public(r/1).
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:- mode(r(?number), zero_or_one).
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:- info(r/1, [
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comment is 'Circle radius.',
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argnames is ['Radius']]).
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r(Radius) :-
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parameter(1, Radius).
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color(Color) :-
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parameter(2, Color).
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rx(Radius) :-
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::r(Radius).
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ry(Radius) :-
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::r(Radius).
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context :-
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write(circle2), nl,
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self(Self), write('self: '), writeq(Self), nl,
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this(This), write('this: '), writeq(This), nl,
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sender(Sender), write('sender: '), writeq(Sender), nl, nl,
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^^context.
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:- end_object.
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