CGAL 6.1 - 2D Triangulations

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Triangulation_2/polylines_triangulation.cpp
#include <CGAL/Exact_predicates_exact_constructions_kernel.h>
#include <CGAL/Polygon_2.h>
#include <CGAL/Constrained_Delaunay_triangulation_2.h>
#include <CGAL/Constrained_triangulation_plus_2.h>
#include <vector>
typedef CGAL::Exact_predicates_exact_constructions_kernel K;
typedef CGAL::Polygon_2<K> Polygon_2;
typedef CGAL::Exact_intersections_tag Itag;
typedef CGAL::Constrained_Delaunay_triangulation_2<K,CGAL::Default, Itag> CDT;
typedef CGAL::Constrained_triangulation_plus_2<CDT> CDTP;
typedef CDTP::Point Point;
typedef CDTP::Constraint_id Cid;
typedef CDTP::Vertex_handle Vertex_handle;
void
print(const CDTP& cdtp, Cid cid)
{
std::cout << "Polyline constraint:" << std::endl;
for(Vertex_handle vh : cdtp.vertices_in_constraint(cid)){
std::cout << vh->point() << std::endl;
}
}
void
contexts(const CDTP& cdtp)
{
for(const auto& sc_and_contexts : cdtp.subconstraints_and_contexts()) {
const auto& [subconstraint, contexts_list_ptr] = sc_and_contexts;
Vertex_handle vp = subconstraint.first, vq = subconstraint.second;
if(cdtp.number_of_enclosing_constraints(vp, vq) == 2){
std::cout << "subconstraint " << vp->point() << " " << vq->point()
<< " is on constraints starting at:\n";
for(const CDTP::Context& c : *contexts_list_ptr) {
std::cout << (*(c.vertices_begin()))->point() << std::endl;
}
}
}
}
int
main( )
{
CDTP cdtp;
cdtp.insert_constraint(Point(0,0), Point(1,1));
std::vector<Point> points;
points.push_back(Point(1,1));
points.push_back(Point(5,2));
points.push_back(Point(6,0));
points.push_back(Point(3,0));
Cid id1 = cdtp.insert_constraint(points.begin(), points.end());
print(cdtp, id1);
Polygon_2 poly;
poly.push_back(Point(2,3));
poly.push_back(Point(4,0));
poly.push_back(Point(5,0));
poly.push_back(Point(6,2));
Cid id2 = cdtp.insert_constraint(poly.vertices_begin(), poly.vertices_end(), true);
print(cdtp, id1);
print(cdtp, id2);
contexts(cdtp);
return 0;
}
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
CGAL::Polygon_2
CGAL::Exact_intersections_tag
Intersection tag for constrained triangulations, if exact predicates and exact constructions are prov...
Definition: Constrained_triangulation_2.h:42