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cgal/Surface_mesher/include/CGAL/Complex_2_in_triangulation_3.h

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// Copyright (c) 2003-2006 INRIA Sophia-Antipolis (France).
// All rights reserved.
//
// This file is part of CGAL (www.cgal.org); you may redistribute it under
// the terms of the Q Public License version 1.0.
// See the file LICENSE.QPL distributed with CGAL.
//
// Licensees holding a valid commercial license may use this file in
// accordance with the commercial license agreement provided with the software.
//
// This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
// WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
//
// $URL$
// $Id$
//
//
// Author(s) : Steve Oudot, David Rey, Mariette Yvinec, Laurent Rineau, Andreas Fabri
#ifndef CGAL_COMPLEX_2_IN_TRIANGULATION_3_H
#define CGAL_COMPLEX_2_IN_TRIANGULATION_3_H
// TODO: add the iterators
// TODO: document the output/input function of C2T3?
#include <CGAL/circulator.h>
#include <CGAL/iterator.h>
#include <CGAL/Union_find.h>
#include <set>
#include <map>
#include <list>
#include <vector>
namespace CGAL {
template < class Tr >
class Complex_2_in_triangulation_3 {
public:
typedef Complex_2_in_triangulation_3 < Tr > Self;
typedef Tr Triangulation;
typedef typename Triangulation::Vertex_handle Vertex_handle;
typedef typename Triangulation::Cell_handle Cell_handle;
typedef typename Triangulation::Facet Facet;
typedef typename Triangulation::Edge Edge;
typedef std::list<Facet> Facets;
typedef std::list<Cell_handle> Cells;
typedef typename Facets::iterator Facet_list_iterator;
typedef std::size_t size_type;
typedef Const_circulator_from_container<Facets> Facet_circulator;
typedef std::map <std::pair <Vertex_handle, Vertex_handle>,
std::pair<int, std::list<Facet> > >
Edge_facet_counter;
enum Face_status{ NOT_IN_COMPLEX, ISOLATED, BOUNDARY, REGULAR, SINGULAR};
class Iterator_not_in_complex {
Self* self;
public:
Iterator_not_in_complex(Self* self) : self(self)
{
}
template <typename Iterator> // Facet or Edges iterators
bool operator()(Iterator it) const {
return ! self->is_in_complex(*it);
}
}; // end struct Iterator_not_in_complex
class Vertex_not_in_complex {
Self* self;
public:
Vertex_not_in_complex(Self* self) : self(self)
{
}
bool operator()(Vertex_handle v) const { // Takes as argument an iterator to a
// Vertex, convertible to Vertex_handle.
return ! self->is_in_complex(v);
}
}; // end struct Vertex_not_in_complex
class Facet_not_in_complex {
Self* self;
public:
Facet_not_in_complex(Self* self) : self(self)
{
}
bool operator()(Facet f) const {
return ! self->is_in_complex(f);
}
}; // end struct Facet_not_in_complex
class Iterator_not_on_boundary {
Self* self;
public:
Iterator_not_on_boundary(Self* self) : self(self)
{
}
template <class Edge_iterator>
bool operator()(Edge_iterator eit) const {
return self->face_status(*eit)!= BOUNDARY;
}
};
typedef Filter_iterator<typename Triangulation::Finite_facets_iterator,
Iterator_not_in_complex> Facet_iterator;
typedef Filter_iterator<typename Triangulation::Finite_edges_iterator,
Iterator_not_in_complex> Edge_iterator;
// class to ensure that Vertex_iterator is convertible to Vertex_handle
class Vertex_iterator :
public Filter_iterator<typename Triangulation::Finite_vertices_iterator,
Vertex_not_in_complex>
{
typedef typename Triangulation::Finite_vertices_iterator Tr_iterator;
typedef Filter_iterator<typename Triangulation::Finite_vertices_iterator,
Vertex_not_in_complex> Base;
typedef typename Base::Predicate Predicate;
typedef Vertex_iterator Self;
public:
Vertex_iterator(Base i) : Base(i)
{
}
Self & operator++() { Base::operator++(); return *this; }
Self & operator--() { Base::operator--(); return *this; }
Self operator++(int) { Self tmp(*this); ++(*this); return tmp; }
Self operator--(int) { Self tmp(*this); --(*this); return tmp; }
operator Vertex_handle()
{
return Vertex_handle(this->base());
}
};
typedef Filter_iterator<typename Triangulation::Finite_edges_iterator,
Iterator_not_on_boundary> Boundary_edges_iterator;
protected:
Triangulation& tr;
Edge_facet_counter edge_facet_counter;
size_type m_number_of_facets;
private:
// computes and return an ordered pair of Vertex
std::pair<Vertex_handle, Vertex_handle>
make_ordered_pair(const Vertex_handle vh1, const Vertex_handle vh2) const {
if (vh1 < vh2) {
return std::make_pair(vh1, vh2);
}
else {
return std::make_pair(vh2, vh1);
}
}
Facet canonical_facet(Cell_handle c, int i) const {
Cell_handle c2 = c->neighbor(i);
return (c2 < c) ? std::make_pair(c2,c2->index(c)) : std::make_pair(c,i);
}
public:
// Constructors
Complex_2_in_triangulation_3 (Triangulation& t)
: tr(t), m_number_of_facets(0)
{
}
void clear()
{
m_number_of_facets = 0;
edge_facet_counter.clear();
}
// Access functions
Triangulation& triangulation()
{
return tr;
}
const Triangulation& triangulation() const
{
return tr;
}
Face_status face_status (const Facet& f) const {
return face_status (f.first, f.second);
}
Face_status face_status (const Cell_handle c, const int i) const {
return (c->is_facet_on_surface(i)) ? REGULAR : NOT_IN_COMPLEX;
}
Face_status face_status (const Edge& e) const {
return face_status(e.first->vertex(e.second), e.first->vertex(e.third));
}
Face_status face_status (const Vertex_handle& va,
const Vertex_handle& vb) const
{
typename Edge_facet_counter::const_iterator it =
edge_facet_counter.find(make_ordered_pair(va, vb));
if (it == edge_facet_counter.end())
return NOT_IN_COMPLEX;
switch (it->second.first)
{
case 0 : return ISOLATED;
case 1 : return BOUNDARY;
case 2 : return REGULAR;
default : return SINGULAR;
}
} // end face_status(const Vertex_handle&, const Vertex_handle&)
Face_status face_status (Vertex_handle v)
{
if(v->is_c2t3_cache_valid() && v->cached_number_of_incident_facets() == 0)
return NOT_IN_COMPLEX;
//test incident edges for REUGALIRITY and count BOUNDARY edges
typename std::vector<Vertex_handle> vertices;
vertices.reserve(64);
tr.incident_vertices(v, std::back_inserter(vertices));
int number_of_boundary_incident_edges = 0; //COULD BE a Bool
for (typename std::vector<Vertex_handle>::iterator vit=vertices.begin();
vit != vertices.end();
vit++ )
{
switch( face_status(v, *vit) )
{
case NOT_IN_COMPLEX: case REGULAR: break;
case BOUNDARY: ++number_of_boundary_incident_edges; break;
default : return SINGULAR;
}
}
// from now on incident edges (in complex) are REGULAR or BOUNDARY
int i,j;
union_find_of_incident_facets(v,i,j);
if ( i == 0 )
return NOT_IN_COMPLEX;
else if ( j > 1 )
return SINGULAR;
else // REGULAR OR BOUNDARY
{
if (number_of_boundary_incident_edges != 0)
return BOUNDARY;
else
return REGULAR;
}
} //end of face_status(Vertex_handle)
// This function should be called only when incident edges
// are known to be REGULAR OR BOUNDARY
bool is_regular_or_boundary_for_vertices(Vertex_handle v) {
int i,j;
union_find_of_incident_facets(v,i,j);
return (j == 1);
}
bool is_in_complex (Vertex_handle v) {
int i,j;
union_find_of_incident_facets(v,i,j);
return ( i != 0);
}
// extract the subset F of facets of the complex incident to v
// set i to the number of facets in F
// set j to the number of connected component of the adjacency graph
// of F
void union_find_of_incident_facets(const Vertex_handle v, int& i, int& j) {
if( v->is_c2t3_cache_valid() )
{
i = v->cached_number_of_incident_facets();
j = v->cached_number_of_components();
return;
}
Union_find<Facet> facets;
incident_facets(v, std::back_inserter(facets));
typedef std::map<Vertex_handle,
typename Union_find<Facet>::handle> Vertex_Set_map;
typedef typename Vertex_Set_map::iterator Vertex_Set_map_iterator;
Vertex_Set_map vsmap;
for(typename Union_find<Facet>::iterator it = facets.begin();
it != facets.end();
++it){
const Cell_handle& ch = (*it).first;
const int& i = (*it).second;
for(int j=0; j < 3; ++j){
const Vertex_handle w = ch->vertex(tr.vertex_triple_index(i,j));
if(w != v){
Vertex_Set_map_iterator vsm_it = vsmap.find(w);
if(vsm_it != vsmap.end()){
facets.unify_sets(vsm_it->second, it);
} else {
vsmap.insert(std::make_pair(w, it));
}
}
}
}
i = facets.size();
j = facets.number_of_sets();
v->set_c2t3_cache(i, j);
return;
}
bool is_in_complex (const Facet& f) const {
return is_in_complex (f.first, f.second);
}
bool is_in_complex (const Cell_handle c, const int i) const {
return face_status(c,i) != NOT_IN_COMPLEX;
}
bool is_in_complex (const Edge& e) const {
return face_status(e) != NOT_IN_COMPLEX;
}
size_type number_of_facets() const
{
return m_number_of_facets;
}
Facet_circulator incident_facets (const Edge& e) {
typename Edge_facet_counter::iterator it =
edge_facet_counter.find(make_ordered_pair(e.first->vertex(e.second),
e.first->vertex(e.third)));
if( it == edge_facet_counter.end() )
return Facet_circulator();
else
{
// position the circulator on the first element of the facets list
Facets& lof = it->second.second;
return Facet_circulator(&lof);
}
}
/** @TODO: document this class in the
SurfaceMeshComplex_2InTriangulation_3 concept.
*/
template <typename OutputIterator>
OutputIterator incident_facets(const Vertex_handle v, OutputIterator it)
{
// TODO: review this function (Laurent Rineau)
// We assume that for the generated facets the Cell_handle is smaller than the opposite one
tr.incident_facets(v,
CGAL::filter_output_iterator(it,
Facet_not_in_complex(this)));
return it;
}
// Setting functions
void set_in_complex (const Facet& f) {
set_in_complex (f.first, f.second);
}
void set_in_complex (const Cell_handle c, const int i) {
change_in_complex_status<true, false>(c, i);
}
template <bool in_complex, bool force_modification>
void change_in_complex_status(const Cell_handle c, const int i)
{
// if not already in the complex
if ( force_modification ||
(in_complex ?
face_status (c, i) == NOT_IN_COMPLEX
: face_status (c, i) != NOT_IN_COMPLEX) )
{
if(in_complex)
++m_number_of_facets;
else
--m_number_of_facets;
Facet f = canonical_facet(c, i);
c->set_facet_on_surface(i, in_complex);
switch( tr.dimension() )
{
case 3:
{
const Cell_handle& c2 = c->neighbor(i);
const int& i2 = c2->index(c);
c2->set_facet_on_surface(i2, in_complex);
}
break;
case 2:
break;
default:
CGAL_assertion(false);
}
const int dimension_plus_1 = tr.dimension() + 1;
// update c2t3 for edges of f
// We consider only pairs made by vertices without i
for (int j = 0; j < dimension_plus_1; j++) {
for (int k = j + 1; k < dimension_plus_1; k++) {
if ( (i != j) && (i != k) ){
const std::pair<Vertex_handle, Vertex_handle> e =
make_ordered_pair(c->vertex(j),
c->vertex(k));
if(in_complex)
{
(edge_facet_counter[e]).first++;
(edge_facet_counter[e]).second.push_back(f); // @TODO: beurk.
// Recode this!
}
else
{
typename Edge_facet_counter::iterator it =
edge_facet_counter.find(e);
CGAL_assertion( it != edge_facet_counter.end() );
if(--(it->second.first) > 0)
it->second.second.remove(f);
else
edge_facet_counter.erase(it);
}
}
}
}
// update c2t3 for vertices of f
for (int j = 0; j < dimension_plus_1; j++) {
if (j != i)
c->vertex(j)->invalidate_c2t3_cache();
}
}
}
void remove_from_complex (const Facet& f) {
remove_from_complex (f.first, f.second);
}
void remove_from_complex (const Cell_handle c, const int i) {
change_in_complex_status<false, false>(c, i);
}
Facet_iterator facets_begin(){
return CGAL::filter_iterator(tr.finite_facets_end(),
Iterator_not_in_complex(this),
tr.finite_facets_begin());
}
Facet_iterator facets_end(){
return CGAL::filter_iterator(tr.finite_facets_end(),
Iterator_not_in_complex(this));
}
Edge_iterator edges_begin(){
return CGAL::filter_iterator(tr.finite_edges_end(),
Iterator_not_in_complex(this),
tr.finite_edges_begin());
}
Edge_iterator edges_end(){
return CGAL::filter_iterator(tr.finite_edges_end(),
Iterator_not_in_complex(this));
}
Vertex_iterator vertices_begin(){
return CGAL::filter_iterator(tr.finite_vertices_end(),
Vertex_not_in_complex(this),
tr.finite_vertices_begin());
}
Vertex_iterator vertices_end(){
return CGAL::filter_iterator(tr.finite_vertices_end(),
Vertex_not_in_complex(this));
}
Boundary_edges_iterator boundary_edges_begin() {
return CGAL::filter_iterator(tr.finite_edges_end(),
Iterator_not_on_boundary(this),
tr.finite_edges_begin());
}
Boundary_edges_iterator boundary_edges_end() {
return CGAL::filter_iterator(tr.finite_edges_end(),
Iterator_not_on_boundary(this));
}
#ifdef CGAL_MESH_3_IO_H
static
std::string io_signature()
{
return Get_io_signature<Tr>()();
}
#endif
}; // end Complex_2_in_triangulation_3
template < class Tr >
std::istream &
operator>> (std::istream& is, Complex_2_in_triangulation_3<Tr>& c2t3)
{
c2t3.clear();
is >> c2t3.triangulation();
// restore datas of c2t3
for(typename Tr::Finite_facets_iterator fit =
c2t3.triangulation().finite_facets_begin();
fit != c2t3.triangulation().finite_facets_end();
++fit)
if(fit->first->is_facet_on_surface(fit->second))
c2t3.template change_in_complex_status<true, true>(fit->first, fit->second);
return is;
}
template < class Tr>
std::ostream &
operator<< (std::ostream& os, const Complex_2_in_triangulation_3<Tr> &c2t3)
{
return os << c2t3.triangulation();
}
} // end namespace CGAL
#endif // CGAL_COMPLEX_2_IN_TRIANGULATION_3_H
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