118 lines
2.1 KiB
Plaintext
118 lines
2.1 KiB
Plaintext
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:- object(shape). % an object with no hierarchy relations with other
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% objects is always compiled as a prototype
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:- info([
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author is 'Paulo Moura',
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version is 1.0,
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date is 2003/2/3,
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comment is 'Generic geometric shape.']).
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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 'Shape color.',
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argnames is ['Color']]).
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:- public(position/2).
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:- mode(position(?integer, ?integer), zero_or_one).
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:- info(position/2, [
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comment is 'Shape position.',
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argnames is ['X', 'Y']]).
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color(red). % default shape color
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position(0, 0). % default shape position
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:- end_object.
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:- object(polygon,
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extends(shape)).
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:- info([
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author is 'Paulo Moura',
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version is 1.1,
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date is 2004/1/8,
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comment is 'Generic polygon.']).
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:- public(nsides/1).
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:- mode(nsides(?integer), zero_or_one).
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:- info(nsides/1, [
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comment is 'Polygon number of sides.',
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argnames is ['Number']]).
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:- public(area/1).
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:- mode(area(-float), zero_or_one).
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:- info(area/1, [
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comment is 'Polygon area.',
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argnames is ['Area']]).
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:- public(perimeter/1).
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:- mode(perimeter(?atom), zero_or_one).
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:- info(perimeter/1, [
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comment is 'Polygon perimeter.',
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argnames is ['Perimeter']]).
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:- end_object.
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:- object(regular_polygon,
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extends(polygon)).
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:- info([
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author is 'Paulo Moura',
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version is 1.1,
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date is 2004/1/8,
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comment is 'Generic regular polygon.']).
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:- public(side/1).
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:- mode(side(?atom), zero_or_one).
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:- info(side/1, [
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comment is 'Regular polygon side length.',
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argnames is ['Length']]).
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side(1). % default side length
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perimeter(Perimeter) :-
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::nsides(Number),
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::side(Side),
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Perimeter is Number*Side.
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:- end_object.
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:- object(square,
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extends(regular_polygon)).
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:- info([
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author is 'Paulo Moura',
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version is 1.0,
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date is 2003/2/3,
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comment is 'Geometric square.']).
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nsides(4).
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area(Area) :-
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::side(Side),
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Area is Side*Side.
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:- end_object.
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:- object(q1,
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extends(square)).
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:- end_object.
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:- object(q2,
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extends(square)).
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position(2, 3).
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color(blue).
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side(3).
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:- end_object.
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