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[Martin Uhrin <>]

Dear CGAL communit,

I'm trying to use an Arrangement_2 with Arr_Bezier_curve_traits_2 but I'm
getting precondition violations [1] for some of my input points.  I've
attached an example input [2] with 4 Bezier curves that is compatible with
the Arrangement_on_surface_2/Bezier_curves.cpp example.

In matplotlib language the polyline I'm trying to draw is given by:

(Path.MOVETO, (2.15, 1.425)),

(Path.CURVE4, (2.13333, 1.425)),
(Path.CURVE4, (2.125, 1.43333)),
(Path.CURVE4, (2.125, 1.45)),

(Path.CURVE4, (2.125, 1.46667)),
(Path.CURVE4, (2.13333, 1.475)),
(Path.CURVE4, (2.15, 1.475)),

(Path.CURVE4, (2.16667, 1.475)),
(Path.CURVE4, (2.175, 1.46667)),
(Path.CURVE4, (2.175, 1.45)),

(Path.CURVE4, (2.175, 1.43333)),
(Path.CURVE4, (2.16667, 1.425)),
(Path.CURVE4, (2.15, 1.425)),

Any help is much appreciated,
-Martin

[1]
terminate called after throwing an instance of
'CGAL::Precondition_exception'
  what():  CGAL ERROR: precondition violation!
Expr: p.compare_xy (cv.right(), cache) != LARGER
File: /usr/include/CGAL/Arr_geometry_traits/Bezier_x_monotone_2.h
Line: 1049

[2]  Bezier.dat
<http://cgal-discuss.949826.n4.nabble.com/file/n4659201/Bezier.dat>  



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