CGAL 6.2 - Surface Mesh: Surface_mesh/sm_properties.cpp

CGAL 6.2 - Surface Mesh

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Surface_mesh/sm_properties.cpp
#include <string>
#include <CGAL/Simple_cartesian.h>
#include <CGAL/Surface_mesh.h>
#include <CGAL/boost/graph/generators.h>
typedef CGAL::Simple_cartesian<double> K;
typedef CGAL::Surface_mesh<K::Point_3> Mesh;
typedef Mesh::Vertex_index vertex_descriptor;
typedef Mesh::Face_index face_descriptor;
int main()
{
Mesh m;
vertex_descriptor v0 = m. add_vertex(K::Point_3(0,2,0));
vertex_descriptor v1 = m.add_vertex(K::Point_3(2,2,0));
vertex_descriptor v2 = m.add_vertex(K::Point_3(0,0,0));
vertex_descriptor v3 = m.add_vertex(K::Point_3(2,0,0));
vertex_descriptor v4 = m.add_vertex(K::Point_3(1,1,0));
m.add_face(v3, v1, v4);
m.add_face(v0, v4, v1);
m.add_face(v0, v2, v4);
m.add_face(v2, v3, v4);
// give each vertex a name, the default is empty
Mesh::Property_map<vertex_descriptor,std::string> name;
bool created;
std::tie(name, created) = m.add_property_map<vertex_descriptor,std::string>("v:name","m1");
assert(created);
// add some names to the vertices
name[v0] = "hello";
name[v2] = "world";
{
// You get an existing property, and created will be false
Mesh::Property_map<vertex_descriptor,std::string> name;
bool created;
std::tie(name, created) = m.add_property_map<vertex_descriptor,std::string>("v:name", "");
assert(! created);
}
// You can't get a property that does not exist
std::optional<Mesh::Property_map<face_descriptor,std::string>> gnus = m.property_map<face_descriptor,std::string>("v:gnus");
assert(!gnus.has_value());
// retrieve the point property for which exists a convenience function
Mesh::Property_map<vertex_descriptor, K::Point_3> location = m.points();
for(vertex_descriptor vd : m.vertices()) {
std::cout << name[vd] << " @ " << location[vd] << std::endl;
}
Mesh m2;
CGAL::make_triangle(K::Point_3(0,0,1), K::Point_3(1,0,1),K::Point_3(0,1,1), m2);
m2.add_property_map<vertex_descriptor,std::string>("v:name","m2");
Mesh::Property_map<vertex_descriptor,int> index;
index = m2.add_property_map<vertex_descriptor,int>("v:index",-1).first;
int i = 0;
for (auto v : vertices(m2)) {
index[v] = i++;
}
std::cout << "properties of m1:" << std::endl;
std::vector<std::string> props = m.properties<vertex_descriptor>();
for(std::string p : props){
std::cout << p << std::endl;
}
m.join(m2);
std::cout << "properties of m1 after join:" << std::endl;
for(std::string p : m.properties<vertex_descriptor>()){
std::cout << p << std::endl;
}
for (auto v : vertices(m)) {
std::cout << name[v] << std::endl;
}
// delete the string property again
m.remove_property_map(name);
return 0;
}
CGAL::Surface_mesh
This class is a data structure that can be used as halfedge data structure or polyhedral surface.
Definition: Surface_mesh.h:329
CGAL::Surface_mesh::add_vertex
Vertex_index add_vertex()
adds a new vertex, and resizes vertex properties if necessary.
Definition: Surface_mesh.h:973
CGAL::make_triangle
boost::graph_traits< Graph >::halfedge_descriptor make_triangle(const P &p0, const P &p1, const P &p2, Graph &g)
CGAL::Simple_cartesian