CGAL users discussion list

[Efi Fogel <>]

Not sure exactly which example you refer to, but the name of the example in the package is polyline.cpp and not ex_polyline.cpp. (I think in an old version it used to be called ex_polyline.cpp.)

The code in polyline.cpp uses an exact kernel.

There is an example called ex_polyline.cpp listed in the book "CGAL Arrangements and Their Applications". The code in this example also uses an exact kernel.

On Sat, Mar 9, 2013 at 4:32 PM, Tapadi <> wrote:

Hello,

I applied your advice and it works perfectly now! Thank you very much.

In order to provide the correct code for anyone else, here are the
modifications I added to the code snippet.
I replaced these two lines :

#include<CGAL/Exact_predicates_inexact_constructions_kernel.h>
typedef CGAL::Exact_predicates_inexact_constructions_kernel  Kernel;

By these two :

#include<CGAL/Exact_predicates_exact_constructions_kernel.h>
typedef CGAL::Exact_predicates_exact_constructions_kernel  Kernel;

I had also to add those following libraries for linking in order to switch
from inexact to exact kernel :

-lgmp
-lboost_thread-mt
-lmpfr

Please note that CGAL points' coordinates are then arbitrary precision
numbers and cannot be directly converted into double (for debugging or
display purposes). One have to use CGAL::to_double function to do so.
http://www.cgal.org/Manual/latest/doc_html/cgal_manual/Algebraic_foundations_ref/Function_to_double.html

Best regards,
Hugo Loi
PhD student at Inria - Maverick Team
http://maverick.inria.fr/



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