CGAL users discussion list

Hi,

I work on a circle covering project and I compute a Voronoi diagram with the 
Voronoi_diagram_2 class.
So I would like to compute the intersection between a Segment_2 object and an 
unbounded halfedge of my Voronoi diagram. To do that, I use the 
"intersection" function, it can work between a Ray_2 object and a Segment_2 
object. So, an unbounded halfedge can be defined by a Ray_2 object (because 
e->is_ray() is true). That's why I would like to construct a Ray_2 object 
which is corresponding to my unbounded haledge.
I can use the method source() to have the source of the halfedge but I also 
need a direction --> Direction_2 (or another Point_2 on the halfedge, or a 
Vector_2 corresponding to the halfedge, or a Line_2) to construct my Ray_2. 
Can you give the name of a method to have this information (direction or 
another point or vector etc.)?
Thanks a lot.

Alexandre Marié (GERAD - HEC MONTRÉAL)