我是 Prolog 的新用户,我正在尝试缩放和变换地图中的坐标,但在缩放和变换 RULE上出现“未充分实例化”错误。这是我的规则,似乎参数没有充分实例化,请你给我解决方案如何解决这个问题。它接缝问题在于我使用“IS”运算符的比例和变换规则
transform_all :-
forall(
representation(Id, Geom),
( transform(Geom, TGeom),
record_transformed_rep(Id, TGeom)
)
).
transform_all :-
forall(
( representation(Id, Geom),
not(transformed_rep(Id))
),
( transform(Geom, TGeom),
record_transformed_rep(Id, TGeom)
)
).
%transformation
transform(Geom, TGeom) :-
scale(Geom, value(10000), SGeom),
translate(SGeom, value(-7.5, -51.9), TGeom).
%record_the_transformed_geometries
record_transformed_rep(Id, TGeom) :-
retractall(representation(Id, _)),
assert(representation(Id, TGeom)),
assert(transformed_rep(Id)). %% flag to avoid infinite loop
%scale_and_translate_metric_Map
scale(point(X,Y), value(V), point(Sx,Sy)) :-
Sx is X * V,
Sy is Y * V.
scale(polyline([]), value(_), polyline([])).
scale(polyline([P|R]), value(V), polyline([Sp|Sr])) :-
scale(P,value(V),Sp),
scale(polyline(R), value(V), polyline(Sr)).
%translate_coordinate_of_metric_map
translate(point(X,Y), value(Dx,Dy), point(Sx,Sy)) :-
Sx is X + Dx,
Sy is Y + Dy.
translate(polyline([]), value(_,_), polyline([])).
translate(polyline([P|R]), value(Dx,Dy), polyline([Sp|Sr])) :-
translate(P,value(Dx,Dy),Sp),
translate(polyline(R), value(Dx,Dy), polyline(Sr)).