CGAL users discussion list

[Winnie Hellmann <>]

> Unfortunately this is not that simple because if you change the sweep
> direction required functors are no longer the same.
I can see your point, but shouldn't that be the business of the Traits
class? For example one could define a Y_monotone_curve_2 in
Arr_linear_traits_2, which would be exactly the same as
X_monotone_curve_2 (... or am I wrong?) and then define the necessary
functors for that class. In my understanding, Arr_linear_traits_2 allows
for both: x- and y-monotone curves and therefore should be a model of
ArrangementXMonotoneTraits_2 and (the non-existent)
ArrangementYMonotoneTraits_2.

By the way: Is there a reason, why Arr_linear_traits_2 is listed as a
model for ArrangementXMonotoneTraits_2 [1], but
ArrangementXMonotoneTraits_2 is not listed as a concept supported by
Arr_linear_traits_2 [2]?

Winnie Hellmann

[1]
http://www.cgal.org/Manual/latest/doc_html/cgal_manual/Arrangement_on_surface_2_ref/Concept_ArrangementXMonotoneTraits_2.html
[2]
http://www.cgal.org/Manual/latest/doc_html/cgal_manual/Arrangement_on_surface_2_ref/Class_Arr_linear_traits_2.html

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