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:- object(math_constants).
:- info([
author is 'Paulo Moura',
version is 1.0,
date is 2000/4/22,
comment is 'Implements predicates for retriving common mathematical constants.']).
:- public(pi/1).
:- mode(pi(-float), one).
:- public(e/1).
:- mode(e(-float), one).
pi(Pi) :-
Pi is 4.0*atan(1.0).
e(E) :-
E is exp(1.0).
:- end_object.
:- object(ellipse(_RX, _RY, _Color),
imports(proto_hierarchy)).
:- info([
author is 'Paulo Moura',
version is 1.0,
date is 2000/4/22,
comment is 'Parametric object for representing geometric ellipses.',
parnames is ['RX', 'RY', 'Color'],
source is 'Example adopted from the SICStus Objects documentation.']).
:- uses(math_constants).
:- public(color/1).
:- mode(color(?atom), zero_or_one).
:- info(color/1, [
comment is 'Ellipse color.',
argnames is ['Color']]).
:- public(rx/1).
:- mode(rx(?number), zero_or_one).
:- info(rx/1, [
comment is 'Ellipse x axis.',
argnames is ['Rx']]).
:- public(ry/1).
:- mode(ry(?number), zero_or_one).
:- info(ry/1, [
comment is 'Ellipse y axis.',
argnames is ['Ry']]).
:- public(area/1).
:- mode(area(-number), one).
:- info(area/1, [
comment is 'Ellipse area.',
argnames is ['Area']]).
:- public(context/0).
:- mode(context, one).
:- info(context/0, [
comment is 'Shows execution context (self, this and sender values).']).
color(Color) :-
parameter(3, Color).
rx(Rx) :-
parameter(1, Rx).
ry(Ry) :-
parameter(2, Ry).
area(Area) :-
::rx(Rx),
::ry(Ry),
math_constants::pi(Pi),
Area is Rx*Ry*Pi.
context :-
write(ellipse3), nl,
self(Self), write('self: '), writeq(Self), nl,
this(This), write('this: '), writeq(This), nl,
sender(Sender), write('sender: '), writeq(Sender), nl, nl.
:- end_object.
:- object(circle(Radius, Color),
extends(ellipse(Radius, Radius, Color))).
:- info([
author is 'Paulo Moura',
version is 1.0,
date is 2000/4/22,
comment is 'Parametric object for representing geometric circles.',
parnames is ['Radius', 'Color'],
source is 'Example adopted from the SICStus Objects documentation.']).
:- public(r/1).
:- mode(r(?number), zero_or_one).
:- info(r/1, [
comment is 'Circle radius.',
argnames is ['Radius']]).
r(Radius) :-
parameter(1, Radius).
color(Color) :-
parameter(2, Color).
rx(Radius) :-
::r(Radius).
ry(Radius) :-
::r(Radius).
context :-
write(circle2), nl,
self(Self), write('self: '), writeq(Self), nl,
this(This), write('this: '), writeq(This), nl,
sender(Sender), write('sender: '), writeq(Sender), nl, nl,
^^context.
:- end_object.
:- object(circle1(Color),
extends(circle(1, Color))).
:- info([
author is 'Paulo Moura',
version is 1.0,
date is 2000/4/22,
comment is 'Parametric object for representing geometric circles with radius = 1.',
parnames is ['Color'],
source is 'Example adopted from the SICStus Objects documentation.']).
context :-
write(circle11), nl,
self(Self), write('self: '), writeq(Self), nl,
this(This), write('this: '), writeq(This), nl,
sender(Sender), write('sender: '), writeq(Sender), nl,
^^context.
:- end_object.
:- object(red_circle(Radius),
extends(circle(Radius, red))).
:- info([
author is 'Paulo Moura',
version is 1.0,
date is 2000/4/22,
comment is 'Parametric object for representing geometric red circles.',
parnames is ['Radius'],
source is 'Example adopted from the SICStus Objects documentation.']).
context :-
write(red_circle1), nl,
self(Self), write('self: '), writeq(Self), nl,
this(This), write('this: '), writeq(This), nl,
sender(Sender), write('sender: '), writeq(Sender), nl, nl,
^^context.
:- end_object.
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