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[HEKTO <>]

I'm getting familiar with Voronoi diagrams in 2D. The following code fragment
outputs sources and targets for *bounded* halfedges:

  const std::list<Site> sv;                                                 
// <=== sites are here
  const VD vd(sv.cbegin(), sv.cend());                                 //
<=== VD is a regular 'Voronoi_diagram_2'
  for (auto fit = vd.faces_begin(); fit != vd.faces_end(); ++fit)
  {
    const auto heitBeg = fit->ccb();
    auto heit = heitBeg;
    do
    {
      if (heit->has_source()) cout << heit->source()->point() << endl;
      if (heit->has_target()) cout << heit->target()->point() << endl;
    } while (++heit != heitBeg);
  }

However I don't see how I can get any ray directions for halfedges, which
don't have source or target.
Could you please advise?




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