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/* This file is part of the Gudhi Library. The Gudhi library
* (Geometric Understanding in Higher Dimensions) is a generic C++
* library for computational topology.
*
* Author(s): Vincent Rouvreau
*
* Copyright (C) 2015 INRIA Saclay (France)
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef SRC_ALPHA_SHAPES_INCLUDE_GUDHI_ALPHA_SHAPES_DELAUNAY_TRIANGULATION_OFF_IO_H_
#define SRC_ALPHA_SHAPES_INCLUDE_GUDHI_ALPHA_SHAPES_DELAUNAY_TRIANGULATION_OFF_IO_H_
#include <string>
#include <vector>
#include <fstream>
#include <map>
#include "gudhi/Off_reader.h"
namespace Gudhi {
namespace alphacomplex {
/**
*@brief Off reader visitor with flag that can be passed to Off_reader to read a Delaunay_triangulation_complex.
*/
template<typename Complex>
class Delaunay_triangulation_off_visitor_reader {
private:
Complex* _complex;
typedef typename Complex::Point Point;
public:
// Pass a Complex as a parameter is required, even if not used. Otherwise, compilation is KO.
Delaunay_triangulation_off_visitor_reader(Complex* _complex_ptr)
: _complex(nullptr) { }
void init(int dim, int num_vertices, int num_faces, int num_edges) {
#ifdef DEBUG_TRACES
std::cout << "Delaunay_triangulation_off_visitor_reader::init - dim=" << dim << " - num_vertices=" <<
num_vertices << " - num_faces=" << num_faces << " - num_edges=" << num_edges << std::endl;
#endif // DEBUG_TRACES
if (num_faces > 0) {
std::cerr << "Delaunay_triangulation_off_visitor_reader::init faces are not taken into account from OFF " <<
"file for Delaunay triangulation - faces are computed." << std::endl;
}
if (num_edges > 0) {
std::cerr << "Delaunay_triangulation_off_visitor_reader::init edges are not taken into account from OFF " <<
"file for Delaunay triangulation - edges are computed." << std::endl;
}
// Complex construction with dimension from file
_complex = new Complex(dim);
}
void point(const std::vector<double>& point) {
#ifdef DEBUG_TRACES
std::cout << "Delaunay_triangulation_off_visitor_reader::point ";
for (auto coordinate : point) {
std::cout << coordinate << " | ";
}
std::cout << std::endl;
#endif // DEBUG_TRACES
_complex->insert(Point(point.size(), point.begin(), point.end()));
}
void maximal_face(const std::vector<int>& face) {
// For Delaunay Triangulation, only points are read
#ifdef DEBUG_TRACES
std::cout << "Delaunay_triangulation_off_visitor_reader::face ";
for (auto vertex : face) {
std::cout << vertex << " | ";
}
std::cout << std::endl;
#endif // DEBUG_TRACES
}
void done() {
#ifdef DEBUG_TRACES
std::cout << "Delaunay_triangulation_off_visitor_reader::done" << std::endl;
#endif // DEBUG_TRACES
}
Complex* get_complex() {
return _complex;
}
};
/**
*@brief Class that allows to load a Delaunay_triangulation_complex from an off file.
*/
template<typename Complex>
class Delaunay_triangulation_off_reader {
public:
/**
* name_file : file to read
* read_complex : complex that will receive the file content
* read_only_points : specify true if only the points must be read
*/
Delaunay_triangulation_off_reader(const std::string & name_file) : valid_(false) {
std::ifstream stream(name_file);
if (stream.is_open()) {
Delaunay_triangulation_off_visitor_reader<Complex> off_visitor(_complex);
Off_reader off_reader(stream);
valid_ = off_reader.read(off_visitor);
if (valid_) {
_complex = off_visitor.get_complex();
}
} else {
std::cerr << "Delaunay_triangulation_off_reader::Delaunay_triangulation_off_reader could not open file " <<
name_file << std::endl;
}
}
/**
* return true if reading did not meet problems.
*/
bool is_valid() const {
return valid_;
}
Complex* get_complex() {
if (valid_)
return _complex;
return nullptr;
}
private:
bool valid_;
Complex* _complex;
};
template<typename Complex>
class Delaunay_triangulation_off_writer {
public:
typedef typename Complex::Point Point;
/**
* name_file : file where the off will be written
* save_complex : complex that be outputted in the file
* for now only save triangles.
*/
Delaunay_triangulation_off_writer(const std::string & name_file, Complex* complex_ptr) {
std::ofstream stream(name_file);
if (stream.is_open()) {
if (complex_ptr->current_dimension() == 3) {
// OFF header
stream << "OFF" << std::endl;
// no endl on next line - don't know why...
stream << complex_ptr->number_of_vertices() << " " << complex_ptr->number_of_finite_full_cells() << " 0";
} else {
// nOFF header
stream << "nOFF" << std::endl;
// no endl on next line - don't know why...
stream << complex_ptr->current_dimension() << " " << complex_ptr->number_of_vertices() << " " <<
complex_ptr->number_of_finite_full_cells() << " 0";
}
// bimap to retrieve vertex handles from points and vice versa
std::map< Point, int > points_to_vh;
// Start to insert at default handle value
int vertex_handle = int();
// Points list
for (auto vit = complex_ptr->vertices_begin(); vit != complex_ptr->vertices_end(); ++vit) {
for (auto Coord = vit->point().cartesian_begin(); Coord != vit->point().cartesian_end(); ++Coord) {
stream << *Coord << " ";
}
stream << std::endl;
points_to_vh[vit->point()] = vertex_handle;
vertex_handle++;
}
for (auto cit = complex_ptr->finite_full_cells_begin(); cit != complex_ptr->finite_full_cells_end(); ++cit) {
std::vector<int> vertexVector;
stream << std::distance(cit->vertices_begin(), cit->vertices_end()) << " ";
for (auto vit = cit->vertices_begin(); vit != cit->vertices_end(); ++vit) {
stream << points_to_vh[(*vit)->point()] << " ";
}
stream << std::endl;
}
stream.close();
} else {
std::cerr << "Delaunay_triangulation_off_writer::Delaunay_triangulation_off_writer could not open file " <<
name_file << std::endl;
}
}
};
} // namespace alphacomplex
} // namespace Gudhi
#endif // SRC_ALPHA_SHAPES_INCLUDE_GUDHI_ALPHA_SHAPES_DELAUNAY_TRIANGULATION_OFF_IO_H_
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