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Ingy döt Net 2023-07-01 11:58:00 -04:00
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Task/Constrained-random-points-on-a-circle/Prolog/constrained-random-points-on-a-circle.pro Normal file
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:- use_module(library(clpfd)).
circle :-
bagof([X,Y], init(X,Y), BL),
length(BL, N),
length(L, 100),
maplist(choose(BL, N), L),
draw_circle(L).
% point selection
choose(BL, N, V) :-
I is random(N),
nth0(I, BL, V).
% to find all couples of numbers verifying
% 100 <= x^2 + y^2 <= 225
init(X1, Y1) :-
X in -15..15,
Y in -15..15,
X*X + Y*Y #>= 100,
X*X + Y*Y #=< 225,
label([X,Y]),
X1 is 10 * X + 200,
Y1 is 10 * Y + 200.
draw_circle(L) :-
new(D, window('Circle')),
send(D, size,size(400,400)),
forall(member([X,Y], L),
( new(C, circle(4)),
send(C, fill_pattern, colour(@default, 0, 0, 0)),
send(C, center(point(X,Y))),
send(D, display, C))),
send(D, open).