89 lines
1.4 KiB
Plaintext
89 lines
1.4 KiB
Plaintext
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:- object(ellipse(_RX, _RY, _Color),
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imports(proto_hierarchy)).
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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 ellipses.',
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parnames is ['RX', 'RY', 'Color'],
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source is 'Example adopted from the SICStus Objects documentation.']).
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:- uses(math_constants).
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:- public(color/1).
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:- mode(color(?atom), zero_or_one).
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:- info(color/1, [
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comment is 'Ellipse color.',
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argnames is ['Color']]).
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:- public(rx/1).
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:- mode(rx(?number), zero_or_one).
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:- info(rx/1, [
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comment is 'Ellipse x axis.',
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argnames is ['Rx']]).
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:- public(ry/1).
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:- mode(ry(?number), zero_or_one).
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:- info(ry/1, [
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comment is 'Ellipse y axis.',
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argnames is ['Ry']]).
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:- public(area/1).
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:- mode(area(-number), one).
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:- info(area/1, [
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comment is 'Ellipse area.',
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argnames is ['Area']]).
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:- public(context/0).
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:- mode(context, one).
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:- info(context/0, [
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comment is 'Shows execution context (self, this and sender values).']).
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color(Color) :-
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parameter(3, Color).
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rx(Rx) :-
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parameter(1, Rx).
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ry(Ry) :-
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parameter(2, Ry).
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area(Area) :-
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::rx(Rx),
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::ry(Ry),
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math_constants::pi(Pi),
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Area is Rx*Ry*Pi.
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context :-
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write(ellipse3), 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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:- end_object.
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