CGAL users discussion list

["Wesley Smith" <>]

Thanks.  So more specifically in terms of code, I can't figure out how
to bisect 2 points given a Voronoi_diagram_2 and a ray halfedge.  I'm
still pretty bewildered by the structure of CGAL when it comes to
traits and predicates etc.

Here's what I have:

typedef CGAL::Exact_predicates_inexact_constructions_kernel K;
typedef CGAL::Delaunay_triangulation_2<K> DT;
typedef CGAL::Delaunay_triangulation_adaptation_traits_2<DT> AT;
typedef CGAL::Delaunay_triangulation_caching_degeneracy_removal_policy_2<DT> 
AP;
typedef CGAL::Voronoi_diagram_2<DT,AT,AP> VD;
typedef CGAL::Line_2<K>  Line_2;
typedef CGAL::Vector_2<K>         Vector_2;
typedef DT::Geom_traits Geom_traits;

Voronoi_diagram_2 vd2;
Edge_iterator edge_iter = vd2->edges_begin();
                
                while(edge_iter != self->edges_end()) {
                     if(edge_iter->is_ray()) {
                                if(edge_iter->has_source()) {
                                        Vertex_handle v = edge_iter->source();
                                        Point_2 p = v->point();
                                        
                                        Delaunay_vertex_handle v2 = 
edge_iter->down();
                                        Point_2 p2 = v2->point();
                                        
                                        Line_2 l =
Geom_traits::Construct_bisector_2(edge_iter->up()->point(),
edge_iter->down()->point());
                                        
                                        Vector_2 dir_vec = l.direction();
                                }

These are the errors I'm getting.  I don't really know enough about
how CGAL partitions things template-wise to understand how to
interpret this.  Any ideas?

/Users/whsmith/Documents/Jitter-Dev/jit.gl.lua/Lua_dev/luaCGAL/voronoi_diagram_2_udata.cpp:151:
error: no matching function for call to
'CGAL::CartesianKernelFunctors::Construct_bisector_2<CGAL::Filtered_kernel<CGAL::Simple_cartesian<double>
> >::Construct_bisector_2(CGAL::Point_2<CGAL::Filtered_kernel<CGAL::Simple_cartesian<double>
> >&, CGAL::Point_2<CGAL::Filtered_kernel<CGAL::Simple_cartesian<double>
> >&)'


/usr/local/CGAL/include/CGAL/Cartesian/function_objects.h:1634: note:
candidates are:
CGAL::CartesianKernelFunctors::Construct_bisector_2<CGAL::Filtered_kernel<CGAL::Simple_cartesian<double>
> >::Construct_bisector_2()


/usr/local/CGAL/include/CGAL/Cartesian/function_objects.h:1634: note:
               
CGAL::CartesianKernelFunctors::Construct_bisector_2<CGAL::Filtered_kernel<CGAL::Simple_cartesian<double>
> >::Construct_bisector_2(const
CGAL::CartesianKernelFunctors::Construct_bisector_2<CGAL::Filtered_kernel<CGAL::Simple_cartesian<double>
> >&)


/Users/whsmith/Documents/Jitter-Dev/jit.gl.lua/Lua_dev/luaCGAL/voronoi_diagram_2_udata.cpp:155:
error: conversion from
'CGAL::Direction_2<CGAL::Filtered_kernel<CGAL::Simple_cartesian<double>
> >' to non-scalar type 'CGAL::Vector_2<cgal::K>' requested


thanks,
wes