CGAL 6.1.1 - 2D Triangulations

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Triangulation_2/segment_soup_to_polylines.cpp
#include <CGAL/Exact_predicates_exact_constructions_kernel.h>
#include <CGAL/Constrained_Delaunay_triangulation_2.h>
#include <CGAL/Constrained_triangulation_plus_2.h>
typedef CGAL::Exact_predicates_exact_constructions_kernel K;
typedef CGAL::Constrained_Delaunay_triangulation_2<K> CDT;
typedef CGAL::Constrained_triangulation_plus_2<CDT> CDTP;
typedef CDTP::Point Point;
typedef CDTP::Constraint_id Cid;
typedef CDTP::Vertex_handle Vertex_handle;
int main()
{
CDTP cdtp;
// First polyline
cdtp.insert_constraint(Point(0,0), Point(1,1));
cdtp.insert_constraint(Point(1,1), Point(2,2));
cdtp.insert_constraint(Point(2,2), Point(3,3));
// Second polyline that cuts the first one in 2
cdtp.insert_constraint(Point(1,1), Point(1,2));
cdtp.insert_constraint(Point(1,2), Point(1,3));
// Third polyline
cdtp.insert_constraint(Point(10,10), Point(20,20));
cdtp.insert_constraint(Point(20,20), Point(30,30));
// Fourth polyline
cdtp.insert_constraint(Point(100,100), Point(200,200));
// Segment soup of 8 segments as input
std::cout << "Input CDT+ has " << cdtp.number_of_constraints()
<< " constraints/subconstraints" << std::endl;
std::cout << "Splitting subconstraints graph into constraints" << std::endl;
cdtp.split_subconstraint_graph_into_constraints();
// 5 polylines as output
std::cout << "Output CDT+ has " << cdtp.number_of_constraints() << " constraints:" << std::endl;
for (CDTP::Constraint_id cid : cdtp.constraints())
{
std::cout << " *";
for (CDTP::Vertex_handle vh : cdtp.vertices_in_constraint(cid))
std::cout << " (" << vh->point() << ")";
std::cout << std::endl;
}
if(cdtp.number_of_constraints() != 5)
{
std::cerr << "Error: expected 5 constraints/subconstraints" << std::endl;
return EXIT_FAILURE;
}
return EXIT_SUCCESS;
}
CGAL::Constrained_Delaunay_triangulation_2
A constrained Delaunay triangulation is a triangulation with constrained edges which tries to be as m...
Definition: Constrained_Delaunay_triangulation_2.h:96
CGAL::Constrained_triangulation_plus_2
The class Constrained_triangulation_plus_2<Tr> provides a constrained triangulation with an additiona...
Definition: Constrained_triangulation_plus_2.h:55
CGAL::Constrained_triangulation_plus_2::insert_constraint
Constraint_id insert_constraint(Point a, Point b)
inserts the constraint segment ab in the triangulation.
CGAL::Exact_predicates_exact_constructions_kernel