CGAL users discussion list

[Andreas Fabri <>]

Hello Thomas,

Can you send me a minimal program so that I can reproduce
and hopefully fix it.

andreas



Thomas Zangl - Home wrote:
>  
> Hi!
>
> I want to test if a given Point lies on a segment:
>
> Code:
> typedef CGAL::Point_2<Voronoi_K> Voronoi_Point;
> typedef Voronoi_K::Ray_2 Voronoi_Ray;
> typedef Voronoi_Triangulation::Segment Voronoi_Segment;
> typedef std::vector<Voronoi_Point> VDPointContainer;
>
> //---------------------------------------------------------------------
> bool hasIntersectionSegmentWithPoints(Voronoi_Segment s, VDPointContainer& 
> points) {
>   std::cout <<"Has the Voronoi_Segment an intersection with a point?" << 
> std::endl ;
>   VDPointContainer::iterator it;
>   for( it = points.begin(); it != points.end(); it++ ) {
>     cout << "Checking point " << *it << endl;
>     if (s.has_on(*it)) {
>       return true;
>     }
>   }
>   return false;
> }
>
> Output:
> Has the Voronoi_Segment an intersection with a point?
> Checking point 0.5 0.5
> CGAL error: assertion violation!
> Expr: !(i>s)
> File: /home/TZi/CGAL-3.3/include/CGAL/Interval_nt.h
> Line: 77
> Explanation: Variable used before being initialized (or CGAL bug)
> Aborted (core dumped)
>
> Any idea what's wrong?
>
> Best regards,