CGAL users discussion list

[Sylvain Pion <>]

Dennis Schieferdecker a écrit :
> Monique Teillaud schrieb:
> > What you might want to do is convert the Circular_arc_point_2's
> > computed by the arrangement into Point_2< Cartesian< Core::Expr > >,
> > then all functionalities of the cgal Kernel would be available on them.
> > I have not tried but I guess it would work (you probably have to do
> > the conversion of coordinates "by hand"). I am afraid this would be
> > rather slow, though.
> Thanks for the information. I have tried to do an exact conversion but
> it seems that this cannot be done. In particular, I don't seem to be
> able to convert the MP_Float type to the respective CORE type without
> going over the double type.

You can try :

 CGAL::MP_Float m;
 CORE::Expr e = m.to_rational<CORE::Expr>();

(I don't make any promise that you will get usable speed though)

> I also tried to use the circular Kernel based on the CORE::Expr number
> type but that proved to be much too slow.



--
Sylvain Pion
INRIA Sophia-Antipolis
Geometrica Project-Team
CGAL, http://cgal.org/