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CGAL 5.5 - 2D Triangulations
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Triangulation_2/constrained_hierarchy_plus.cpp
#include <CGAL/Exact_predicates_inexact_constructions_kernel.h>
#include <CGAL/Constrained_Delaunay_triangulation_2.h>
#include <CGAL/Triangulation_hierarchy_2.h>
#include <CGAL/Constrained_triangulation_plus_2.h>
#include <cassert>
#include <iostream>
typedef Triangulation::Point Point;
int
main( )
{
Triangulation cdt;
std::cout << "Inserting a grid 5 x 5 of constraints " << std::endl;
for (int i = 1; i < 6; ++i)
cdt.insert_constraint( Point(0,i), Point(6,i));
for (int j = 1; j < 6; ++j)
cdt.insert_constraint( Point(j,0), Point(j,6));
int count = 0;
for (Triangulation::Subconstraint_iterator scit = cdt.subconstraints_begin();
scit != cdt.subconstraints_end();
++scit) ++count;
std::cout << "The number of resulting constrained edges is ";
std::cout << count << std::endl;
//verbose mode of is_valid ; shows the number of vertices at each level
std::cout << "The number of vertices at successive levels" << std::endl;
assert(cdt.is_valid(true));
return 0;
}
    CGAL 5.5 - 2D Triangulations
    Triangulation_2/constrained_hierarchy_plus.cpp
    #include <CGAL/Exact_predicates_inexact_constructions_kernel.h>
    #include <CGAL/Constrained_Delaunay_triangulation_2.h>
    #include <CGAL/Triangulation_hierarchy_2.h>
    #include <CGAL/Constrained_triangulation_plus_2.h>
    #include <cassert>
    #include <iostream>
    typedef Triangulation::Point Point;
    int
    main( )
    {
    Triangulation cdt;
    std::cout << "Inserting a grid 5 x 5 of constraints " << std::endl;
    for (int i = 1; i < 6; ++i)
    cdt.insert_constraint( Point(0,i), Point(6,i));
    for (int j = 1; j < 6; ++j)
    cdt.insert_constraint( Point(j,0), Point(j,6));
    int count = 0;
    for (Triangulation::Subconstraint_iterator scit = cdt.subconstraints_begin();
    scit != cdt.subconstraints_end();
    ++scit) ++count;
    std::cout << "The number of resulting constrained edges is ";
    std::cout << count << std::endl;
    //verbose mode of is_valid ; shows the number of vertices at each level
    std::cout << "The number of vertices at successive levels" << std::endl;
    assert(cdt.is_valid(true));
    return 0;
    }