void Viewer::triangulate_facet()
{
pos_facets.resize(0);
flat_normals.resize(0);
smooth_normals.resize(0);
colors.resize(0);
LCC &lcc = *scene->lcc;
for (LCC::Attribute_range<3>::type::iterator
it=lcc.attributes<3>().begin(),
itend=lcc.attributes<3>().end(); it!=itend; ++it )
{
if ( it->info().is_visible() )
{
for(LCC::One_dart_per_incident_cell_range<2,3>::iterator
dartIter=lcc.one_dart_per_incident_cell<2,3>
(lcc.dart_of_attribute<3>(it)).begin(); dartIter.cont(); ++dartIter)
{
//Computes the normal of the facet
Traits::Vector_3 normal = CGAL::compute_normal_of_cell_2(lcc,dartIter);
normal = normal/(CGAL::sqrt(normal*normal));
P_traits cdt_traits(normal);
CDT cdt(cdt_traits);
LCC::Dart_of_orbit_range<1>::const_iterator
he_circ = lcc.darts_of_orbit<1>(dartIter).begin(),
he_circ_end = lcc.darts_of_orbit<1>(dartIter).end();
// Iterates on the vector of facet handles
CDT::Vertex_handle previous, first;
do {
CDT::Vertex_handle vh = cdt.insert(lcc.point(he_circ));
if(first == 0) {
first = vh;
}
//vh->info() = he_circ;
if(previous != 0 && previous != vh) {
cdt.insert_constraint(previous, vh);
}
previous = vh;
} while( ++he_circ != he_circ_end );
cdt.insert_constraint(previous, first);
// sets mark is_external
for(CDT::All_faces_iterator
fit = cdt.all_faces_begin(),
end = cdt.all_faces_end();
fit != end; ++fit)
{
fit->info().is_external = false;
}
//check if the facet is external or internal
std::queue<CDT::Face_handle> face_queue;
face_queue.push(cdt.infinite_vertex()->face());
while(! face_queue.empty() ) {
CDT::Face_handle fh = face_queue.front();
face_queue.pop();
if(fh->info().is_external) continue;
fh->info().is_external = true;
for(int i = 0; i <3; ++i) {
if(!cdt.is_constrained(std::make_pair(fh, i)))
{
face_queue.push(fh->neighbor(i));
}
}
}
//iterates on the internal faces to add the vertices to the positions
//and the normals to the appropriate vectors
for(CDT::Finite_faces_iterator
ffit = cdt.finite_faces_begin(),
end = cdt.finite_faces_end();
ffit != end; ++ffit)
{
if(ffit->info().is_external)
continue;
//compute normals (no smooth for non-triangle facets objects
LCC::Vector normal = CGAL::compute_normal_of_cell_2(lcc,dartIter);
normal = normal/(CGAL::sqrt(normal*normal));
smooth_normals.push_back(normal.x());smooth_normals.push_back(normal.y());smooth_normals.push_back(normal.z());
smooth_normals.push_back(normal.x());smooth_normals.push_back(normal.y());smooth_normals.push_back(normal.z());
smooth_normals.push_back(normal.x());smooth_normals.push_back(normal.y());smooth_normals.push_back(normal.z());
flat_normals.push_back(normal.x());flat_normals.push_back(normal.y());flat_normals.push_back(normal.z());
flat_normals.push_back(normal.x());flat_normals.push_back(normal.y());flat_normals.push_back(normal.z());
flat_normals.push_back(normal.x());flat_normals.push_back(normal.y());flat_normals.push_back(normal.z());
pos_facets.push_back(ffit->vertex(0)->point().x()); pos_facets.push_back(ffit->vertex(0)->point().y()); pos_facets.push_back(ffit->vertex(0)->point().z());
pos_facets.push_back(ffit->vertex(1)->point().x()); pos_facets.push_back(ffit->vertex(1)->point().y()); pos_facets.push_back(ffit->vertex(1)->point().z());
pos_facets.push_back(ffit->vertex(2)->point().x()); pos_facets.push_back(ffit->vertex(2)->point().y()); pos_facets.push_back(ffit->vertex(2)->point().z());
double r = (double)lcc.info<3>(dartIter).color().r()/255.0;
double g = (double)lcc.info<3>(dartIter).color().g()/255.0;
double b = (double)lcc.info<3>(dartIter).color().b()/255.0;
if ( !lcc.is_free(dartIter, 3) )
{
r += (double)lcc.info<3>(lcc.beta(dartIter,3)).color().r()/255.0;
g += (double)lcc.info<3>(lcc.beta(dartIter,3)).color().g()/255.0;
b += (double)lcc.info<3>(lcc.beta(dartIter,3)).color().b()/255.0;
r /= 2; g /= 2; b /= 2;
}
colors.push_back(r);colors.push_back(g);colors.push_back(b);
colors.push_back(r);colors.push_back(g);colors.push_back(b);
colors.push_back(r);colors.push_back(g);colors.push_back(b);
}
}
}
}
}
void Scene_nef_polyhedron_item::compute_normals_and_vertices(void)
{
int count = 0;
positions_facets.resize(0);
positions_points.resize(0);
color_lines.resize(0);
color_facets.resize(0);
color_points.resize(0);
normals.resize(0);
positions_lines.resize(0);
//The Facets
{
for(Nef_polyhedron::Halffacet_const_iterator
f = nef_poly->halffacets_begin (),
end = nef_poly->halffacets_end();
f != end; ++f)
{
if(f->is_twin()) continue;
count++;
Nef_polyhedron::Vector_3 v = f->plane().orthogonal_vector();
P_traits cdt_traits(v);
CDT cdt(cdt_traits);
for(Nef_polyhedron::Halffacet_cycle_const_iterator
fc = f->facet_cycles_begin(),
end = f->facet_cycles_end();
fc != end; ++fc)
{
if ( fc.is_shalfedge() )
{
Nef_polyhedron::SHalfedge_const_handle h = fc;
Nef_polyhedron::SHalfedge_around_facet_const_circulator hc(h), he(hc);
CDT::Vertex_handle previous, first;
do {
Nef_polyhedron::SVertex_const_handle v = hc->source();
const Nef_polyhedron::Point_3& point = v->source()->point();
CDT::Vertex_handle vh = cdt.insert(point);
if(first == 0) {
first = vh;
}
vh->info() = hc->source();
if(previous != 0 && previous != vh) {
cdt.insert_constraint(previous, vh);
}
previous = vh;
} while( ++hc != he );
cdt.insert_constraint(previous, first);
// sets mark is_external
for(CDT::All_faces_iterator
fit = cdt.all_faces_begin(),
end = cdt.all_faces_end();
fit != end; ++fit)
{
fit->info().is_external = false;
}
//check if the facet is external or internal
std::queue<CDT::Face_handle> face_queue;
face_queue.push(cdt.infinite_vertex()->face());
while(! face_queue.empty() ) {
CDT::Face_handle fh = face_queue.front();
face_queue.pop();
if(fh->info().is_external) continue;
fh->info().is_external = true;
for(int i = 0; i <3; ++i) {
if(!cdt.is_constrained(std::make_pair(fh, i)))
{
face_queue.push(fh->neighbor(i));
}
}
}
//iterates on the internal faces to add the vertices to the positions
//and the normals to the appropriate vectors
for(CDT::Finite_faces_iterator
ffit = cdt.finite_faces_begin(),
end = cdt.finite_faces_end();
ffit != end; ++ffit)
{
if(ffit->info().is_external){ continue;}
for(int i = 0; i<3; i++)
{
positions_facets.push_back(CGAL::to_double(ffit->vertex(i)->point().x()));
positions_facets.push_back(CGAL::to_double(ffit->vertex(i)->point().y()));
positions_facets.push_back(CGAL::to_double(ffit->vertex(i)->point().z()));
}
Nef_polyhedron::Vector_3 v = f->plane().orthogonal_vector();
GLdouble normal[3];
normal[0] = CGAL::to_double(v.x());
normal[1] = CGAL::to_double(v.y());
normal[2] = CGAL::to_double(v.z());
GLdouble norm = normal[0]*normal[0]
+ normal[1]*normal[1]
+ normal[2]*normal[2];
norm = CGAL::sqrt(norm);
normal[0] /= norm;
normal[1] /= norm;
normal[2] /= norm;
normals.push_back(normal[0]);
normals.push_back(normal[1]);
normals.push_back(normal[2]);
normals.push_back(normal[0]);
normals.push_back(normal[1]);
normals.push_back(normal[2]);
normals.push_back(normal[0]);
normals.push_back(normal[1]);
normals.push_back(normal[2]);
if(is_selected)
{
color_facets.push_back(this->color().lighter(120).redF());
color_facets.push_back(this->color().lighter(120).greenF());
color_facets.push_back(this->color().lighter(120).blueF());
color_facets.push_back(this->color().lighter(120).redF());
color_facets.push_back(this->color().lighter(120).greenF());
color_facets.push_back(this->color().lighter(120).blueF());
color_facets.push_back(this->color().lighter(120).redF());
color_facets.push_back(this->color().lighter(120).greenF());
color_facets.push_back(this->color().lighter(120).blueF());
}
else
{
color_facets.push_back(this->color().redF());
color_facets.push_back(this->color().greenF());
color_facets.push_back(this->color().blueF());
color_facets.push_back(this->color().redF());
color_facets.push_back(this->color().greenF());
color_facets.push_back(this->color().blueF());
color_facets.push_back(this->color().redF());
color_facets.push_back(this->color().greenF());
color_facets.push_back(this->color().blueF());
}
}
}
}
}
} // end facets
//The Lines
{
for(Nef_polyhedron::Halfedge_const_iterator
e = nef_poly->halfedges_begin(),
end = nef_poly->halfedges_end();
e != end; ++e)
{
if (e->is_twin()) continue;
const Nef_polyhedron::Vertex_const_handle& s = e->source();
const Nef_polyhedron::Vertex_const_handle& t = e->twin()->source();
const Nef_polyhedron::Point_3& a = s->point();
const Nef_polyhedron::Point_3& b = t->point();
positions_lines.push_back(CGAL::to_double(a.x()));
positions_lines.push_back(CGAL::to_double(a.y()));
positions_lines.push_back(CGAL::to_double(a.z()));
positions_lines.push_back(CGAL::to_double(b.x()));
positions_lines.push_back(CGAL::to_double(b.y()));
positions_lines.push_back(CGAL::to_double(b.z()));
if(is_selected)
{
color_lines.push_back(this->color().lighter(50).redF());
color_lines.push_back(this->color().lighter(50).greenF());
color_lines.push_back(this->color().lighter(50).blueF());
color_lines.push_back(this->color().lighter(50).redF());
color_lines.push_back(this->color().lighter(50).greenF());
color_lines.push_back(this->color().lighter(50).blueF());
}
else
{
color_lines.push_back(0.0);
color_lines.push_back(0.0);
color_lines.push_back(0.0);
color_lines.push_back(0.0);
color_lines.push_back(0.0);
color_lines.push_back(0.0);
}
}
}
//The points
{
for(Nef_polyhedron::Vertex_const_iterator
v = nef_poly->vertices_begin(),
end = nef_poly->vertices_end();
v != end; ++v)
{
const Nef_polyhedron::Point_3& p = v->point();
positions_points.push_back(CGAL::to_double(p.x()));
positions_points.push_back(CGAL::to_double(p.y()));
positions_points.push_back(CGAL::to_double(p.z()));
color_points.push_back(this->color().lighter(50).redF());
color_points.push_back(this->color().lighter(50).greenF());
color_points.push_back(this->color().lighter(50).blueF());
color_points.push_back(this->color().lighter(50).redF());
color_points.push_back(this->color().lighter(50).greenF());
color_points.push_back(this->color().lighter(50).blueF());
}
} //end points
}
void
Scene_polyhedron_item::triangulate_facet_color(Facet_iterator fit) const
{
Traits::Vector_3 normal =
CGAL::Polygon_mesh_processing::compute_face_normal(fit, *poly);
//check if normal contains NaN values
if (normal.x() != normal.x() || normal.y() != normal.y() || normal.z() != normal.z())
{
qDebug()<<"Warning : normal is not valid. Facet not displayed";
return;
}
P_traits cdt_traits(normal);
CDT cdt(cdt_traits);
Facet::Halfedge_around_facet_circulator
he_circ = fit->facet_begin(),
he_circ_end(he_circ);
// Iterates on the vector of facet handles
CDT::Vertex_handle previous, first;
do {
CDT::Vertex_handle vh = cdt.insert(he_circ->vertex()->point());
if(first == 0) {
first = vh;
}
vh->info() = he_circ;
if(previous != 0 && previous != vh) {
cdt.insert_constraint(previous, vh);
}
previous = vh;
} while( ++he_circ != he_circ_end );
cdt.insert_constraint(previous, first);
// sets mark is_external
for(CDT::All_faces_iterator
afit = cdt.all_faces_begin(),
end = cdt.all_faces_end();
afit != end; ++afit)
{
afit->info().is_external = false;
}
//check if the facet is external or internal
std::queue<CDT::Face_handle> face_queue;
face_queue.push(cdt.infinite_vertex()->face());
while(! face_queue.empty() ) {
CDT::Face_handle fh = face_queue.front();
face_queue.pop();
if(fh->info().is_external) continue;
fh->info().is_external = true;
for(int i = 0; i <3; ++i) {
if(!cdt.is_constrained(std::make_pair(fh, i)))
{
face_queue.push(fh->neighbor(i));
}
}
}
//iterates on the internal faces to add the vertices to the positions vector
for(CDT::Finite_faces_iterator
ffit = cdt.finite_faces_begin(),
end = cdt.finite_faces_end();
ffit != end; ++ffit)
{
if(ffit->info().is_external)
continue;
//Add Colors
for(int i = 0; i<3; ++i)
{
const int this_patch_id = fit->patch_id();
color_facets.push_back(colors_[this_patch_id].redF());
color_facets.push_back(colors_[this_patch_id].greenF());
color_facets.push_back(colors_[this_patch_id].blueF());
color_facets.push_back(colors_[this_patch_id].redF());
color_facets.push_back(colors_[this_patch_id].greenF());
color_facets.push_back(colors_[this_patch_id].blueF());
}
}
}
void
Scene_polyhedron_item::triangulate_facet(Facet_iterator fit) const
{
//Computes the normal of the facet
Traits::Vector_3 normal =
CGAL::Polygon_mesh_processing::compute_face_normal(fit,*poly);
//check if normal contains NaN values
if (normal.x() != normal.x() || normal.y() != normal.y() || normal.z() != normal.z())
{
qDebug()<<"Warning : normal is not valid. Facet not displayed";
return;
}
P_traits cdt_traits(normal);
CDT cdt(cdt_traits);
Facet::Halfedge_around_facet_circulator
he_circ = fit->facet_begin(),
he_circ_end(he_circ);
// Iterates on the vector of facet handles
CDT::Vertex_handle previous, first;
do {
CDT::Vertex_handle vh = cdt.insert(he_circ->vertex()->point());
if(first == 0) {
first = vh;
}
vh->info() = he_circ;
if(previous != 0 && previous != vh) {
cdt.insert_constraint(previous, vh);
}
previous = vh;
} while( ++he_circ != he_circ_end );
cdt.insert_constraint(previous, first);
// sets mark is_external
for(CDT::All_faces_iterator
fit2 = cdt.all_faces_begin(),
end = cdt.all_faces_end();
fit2 != end; ++fit2)
{
fit2->info().is_external = false;
}
//check if the facet is external or internal
std::queue<CDT::Face_handle> face_queue;
face_queue.push(cdt.infinite_vertex()->face());
while(! face_queue.empty() ) {
CDT::Face_handle fh = face_queue.front();
face_queue.pop();
if(fh->info().is_external) continue;
fh->info().is_external = true;
for(int i = 0; i <3; ++i) {
if(!cdt.is_constrained(std::make_pair(fh, i)))
{
face_queue.push(fh->neighbor(i));
}
}
}
//iterates on the internal faces to add the vertices to the positions
//and the normals to the appropriate vectors
for(CDT::Finite_faces_iterator
ffit = cdt.finite_faces_begin(),
end = cdt.finite_faces_end();
ffit != end; ++ffit)
{
if(ffit->info().is_external)
continue;
double vertices[3][3];
vertices[0][0] = ffit->vertex(0)->point().x();
vertices[0][1] = ffit->vertex(0)->point().y();
vertices[0][2] = ffit->vertex(0)->point().z();
vertices[1][0] = ffit->vertex(1)->point().x();
vertices[1][1] = ffit->vertex(1)->point().y();
vertices[1][2] = ffit->vertex(1)->point().z();
vertices[2][0] = ffit->vertex(2)->point().x();
vertices[2][1] = ffit->vertex(2)->point().y();
vertices[2][2] = ffit->vertex(2)->point().z();
positions_facets.push_back( vertices[0][0]);
positions_facets.push_back( vertices[0][1]);
positions_facets.push_back( vertices[0][2]);
positions_facets.push_back(1.0);
positions_facets.push_back( vertices[1][0]);
positions_facets.push_back( vertices[1][1]);
positions_facets.push_back( vertices[1][2]);
positions_facets.push_back(1.0);
positions_facets.push_back( vertices[2][0]);
positions_facets.push_back( vertices[2][1]);
positions_facets.push_back( vertices[2][2]);
positions_facets.push_back(1.0);
typedef Kernel::Vector_3 Vector;
Vector n = CGAL::Polygon_mesh_processing::compute_face_normal(fit, *poly);
normals_flat.push_back(n.x());
normals_flat.push_back(n.y());
normals_flat.push_back(n.z());
normals_flat.push_back(n.x());
normals_flat.push_back(n.y());
normals_flat.push_back(n.z());
normals_flat.push_back(n.x());
normals_flat.push_back(n.y());
normals_flat.push_back(n.z());
normals_gouraud.push_back(n.x());
normals_gouraud.push_back(n.y());
normals_gouraud.push_back(n.z());
normals_gouraud.push_back(n.x());
normals_gouraud.push_back(n.y());
normals_gouraud.push_back(n.z());
normals_gouraud.push_back(n.x());
normals_gouraud.push_back(n.y());
normals_gouraud.push_back(n.z());
}
}
void Viewer::compute_face(Dart_handle dh, LCC::size_type markface)
{
LCC &lcc = *scene->lcc;
CGAL::mark_cell<LCC, 2>(lcc, dh, markface);
double r = (double)lcc.info<3>(dh).color().r()/255.0;
double g = (double)lcc.info<3>(dh).color().g()/255.0;
double b = (double)lcc.info<3>(dh).color().b()/255.0;
if ( !lcc.is_free(dh, 3) )
{
r += (double)lcc.info<3>(lcc.beta(dh,3)).color().r()/255.0;
g += (double)lcc.info<3>(lcc.beta(dh,3)).color().g()/255.0;
b += (double)lcc.info<3>(lcc.beta(dh,3)).color().b()/255.0;
r /= 2; g /= 2; b /= 2;
}
//compute flat normals
LCC::Vector normal = CGAL::compute_normal_of_cell_2(lcc,dh);
normal = normal/(CGAL::sqrt(normal*normal));
if (lcc.beta<1,1,1>(dh)!=dh)
{
P_traits cdt_traits(normal);
CDT cdt(cdt_traits);
// Iterates on the vector of facet handles
CDT::Vertex_handle previous = NULL, first = NULL;
for (LCC::Dart_of_orbit_range<1>::const_iterator
he_circ = lcc.darts_of_orbit<1>(dh).begin(),
he_circ_end = lcc.darts_of_orbit<1>(dh).end();
he_circ!=he_circ_end; ++he_circ)
{
CDT::Vertex_handle vh = cdt.insert(lcc.point(he_circ));
if(first == NULL)
{ first = vh; }
vh->info().v = CGAL::compute_normal_of_cell_0<LCC>(lcc, he_circ);
if(previous!=NULL && previous != vh)
{ cdt.insert_constraint(previous, vh); }
previous = vh;
}
if (previous!=NULL)
cdt.insert_constraint(previous, first);
// sets mark is_external
for(CDT::All_faces_iterator fit = cdt.all_faces_begin(),
fitend = cdt.all_faces_end(); fit!=fitend; ++fit)
{
fit->info().is_external = true;
fit->info().is_process = false;
}
//check if the facet is external or internal
std::queue<CDT::Face_handle> face_queue;
CDT::Face_handle face_internal = NULL;
face_queue.push(cdt.infinite_vertex()->face());
while(! face_queue.empty() )
{
CDT::Face_handle fh = face_queue.front();
face_queue.pop();
if(!fh->info().is_process)
{
fh->info().is_process = true;
for(int i = 0; i <3; ++i)
{
if(!cdt.is_constrained(std::make_pair(fh, i)))
{
face_queue.push(fh->neighbor(i));
}
else if (face_internal==NULL)
{
face_internal = fh->neighbor(i);
}
}
}
}
if ( face_internal!=NULL )
face_queue.push(face_internal);
while(! face_queue.empty() )
{
CDT::Face_handle fh = face_queue.front();
face_queue.pop();
if(!fh->info().is_process)
{
fh->info().is_process = true;
fh->info().is_external = false;
for(int i = 0; i <3; ++i)
{
if(!cdt.is_constrained(std::make_pair(fh, i)))
{
face_queue.push(fh->neighbor(i));
}
}
}
}
//iterates on the internal faces to add the vertices to the positions
//and the normals to the appropriate vectors
for(CDT::Finite_faces_iterator ffit = cdt.finite_faces_begin(),
ffitend = cdt.finite_faces_end(); ffit != ffitend; ++ffit)
{
if(!ffit->info().is_external)
{
flat_normals.push_back(normal.x());
flat_normals.push_back(normal.y());
flat_normals.push_back(normal.z());
flat_normals.push_back(normal.x());
flat_normals.push_back(normal.y());
flat_normals.push_back(normal.z());
flat_normals.push_back(normal.x());
flat_normals.push_back(normal.y());
flat_normals.push_back(normal.z());
smooth_normals.push_back(ffit->vertex(0)->info().v.x());
smooth_normals.push_back(ffit->vertex(0)->info().v.y());
smooth_normals.push_back(ffit->vertex(0)->info().v.z());
smooth_normals.push_back(ffit->vertex(1)->info().v.x());
smooth_normals.push_back(ffit->vertex(1)->info().v.y());
smooth_normals.push_back(ffit->vertex(1)->info().v.z());
smooth_normals.push_back(ffit->vertex(2)->info().v.x());
smooth_normals.push_back(ffit->vertex(2)->info().v.y());
smooth_normals.push_back(ffit->vertex(2)->info().v.z());
pos_facets.push_back(ffit->vertex(0)->point().x());
pos_facets.push_back(ffit->vertex(0)->point().y());
pos_facets.push_back(ffit->vertex(0)->point().z());
pos_facets.push_back(ffit->vertex(1)->point().x());
pos_facets.push_back(ffit->vertex(1)->point().y());
pos_facets.push_back(ffit->vertex(1)->point().z());
pos_facets.push_back(ffit->vertex(2)->point().x());
pos_facets.push_back(ffit->vertex(2)->point().y());
pos_facets.push_back(ffit->vertex(2)->point().z());
colors.push_back(r);colors.push_back(g);colors.push_back(b);
colors.push_back(r);colors.push_back(g);colors.push_back(b);
colors.push_back(r);colors.push_back(g);colors.push_back(b);
}
}
}
else
{
colors.push_back(r);colors.push_back(g);colors.push_back(b);
colors.push_back(r);colors.push_back(g);colors.push_back(b);
colors.push_back(r);colors.push_back(g);colors.push_back(b);
flat_normals.push_back(normal.x());
flat_normals.push_back(normal.y());
flat_normals.push_back(normal.z());
flat_normals.push_back(normal.x());
flat_normals.push_back(normal.y());
flat_normals.push_back(normal.z());
flat_normals.push_back(normal.x());
flat_normals.push_back(normal.y());
flat_normals.push_back(normal.z());
for (LCC::Dart_of_orbit_range<1>::const_iterator
orbitIter = lcc.darts_of_orbit<1>(dh).begin();
orbitIter.cont(); ++orbitIter)
{
//compute Smooth normals
LCC::Vector normal = CGAL::compute_normal_of_cell_0(lcc,orbitIter);
normal = normal/(CGAL::sqrt(normal*normal));
smooth_normals.push_back(normal.x());
smooth_normals.push_back(normal.y());
smooth_normals.push_back(normal.z());
const LCC::Point& p = lcc.point(orbitIter);
pos_facets.push_back(p.x());
pos_facets.push_back(p.y());
pos_facets.push_back(p.z());
}
}
}
int main() {
//construct two non-intersecting nested polygons
Polygon_2 polygon1;
polygon1.push_back(Point_2(0.0, 0.0));
polygon1.push_back(Point_2(2.0, 0.0));
polygon1.push_back(Point_2(1.7, 1.0));
polygon1.push_back(Point_2(2.0, 2.0));
polygon1.push_back(Point_2(0.0, 2.0));
Polygon_2 polygon2;
polygon2.push_back(Point_2(0.5, 0.5));
polygon2.push_back(Point_2(1.5, 0.5));
polygon2.push_back(Point_2(1.5, 1.5));
polygon2.push_back(Point_2(0.5, 1.5));
//Insert the polyons into a constrained triangulation
CDT cdt;
insert_polygon(cdt, polygon1);
insert_polygon(cdt, polygon2);
//Extract point and provide the an index
std::vector< triangulation_point > points ;
for ( CDT::Vertex_iterator it = cdt.vertices_begin(); it != cdt.vertices_end(); ++it ){
it->info() = points.size() ;
points.push_back( it->point() );
}
//Mark facets that are inside the domain bounded by the polygon
mark_domains(cdt);
//
int count = 0;
for (CDT::Finite_faces_iterator fit = cdt.finite_faces_begin(); fit != cdt.finite_faces_end(); ++fit) {
if (fit->info().in_domain()){
++count;
}
}
/*
* export
*/
std::ofstream ofs("polygon_triangulation2.obj");
if ( ! ofs.good() ){
std::cout << "can't open file" << std::endl;
return 1 ;
}
//-- print vertices
ofs << "# " << points.size() << " vertices"<< std::endl ;
for ( size_t i = 0; i < points.size(); i++ ){
ofs << "v " << points[i] << " 0.0" << std::endl;
}
//-- print faces
ofs << "# " << cdt.number_of_faces() << " faces"<< std::endl ;
// warning : Delaunay_triangulation_2::All_faces_iterator iterator over infinite faces
for ( CDT::Finite_faces_iterator it = cdt.finite_faces_begin(); it != cdt.finite_faces_end(); ++it )
{
//ignore holes
if ( ! it->info().in_domain() ){
continue ;
}
size_t ia = it->vertex(0)->info();
size_t ib = it->vertex(1)->info();
size_t ic = it->vertex(2)->info();
assert( it->is_valid() );
//assert ( ia < cdt.number_of_vertices() || ib < tri.number_of_vertices() || ic < tri.number_of_vertices() ) ;
ofs << "f " << ( ia + 1 ) << " " << ( ib + 1 ) << " " << ( ic + 1 ) << std::endl;
}
return 0;
}