CGAL users discussion list

Thomas Zangl wrote:
>  wrote:
>
> > > How to convert a K::Ray_2 to a Circular_k::Line_arc_2?
> >
> > It cannot work: rays go to infinity, while 'line arcs' have two finite
> > (possibly algebraic) endpoints.
>
> You are right and the clipping of the ray makes them finite but, I was
> also unable to convert a segment to a Line_Arc_2.  I worked-a-round using
> the << and >> operators and a tempfile (for debugging).
> But this is inefficient and ugly :-)
>
> This is my work-a-round code, maybe you can show my the right way to
> cast the Segment into Line_Arc_2:

I see a constructor of Line_arc_2 fron Segment_2 documented in the manual:

http://www.cgal.org/Manual/3.3/doc_html/cgal_manual/Circular_kernel_2_ref/Class_Line_arc_2.html#Cross_link_anchor_452

Line_arc_2<CircularKernel> la ( CircularKernel::Segment_2 s);

        Monique Teillaud