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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): David Salinas
*
* Copyright (C) 2014 INRIA
*
* 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 SKELETON_BLOCKER_SKELETON_BLOCKER_OFF_IO_H_
#define SKELETON_BLOCKER_SKELETON_BLOCKER_OFF_IO_H_
#include <gudhi/Off_reader.h>
#include <string>
#include <vector>
#include <map>
namespace Gudhi {
namespace skeleton_blocker {
/**
*@brief Off reader visitor that can be passed to Off_reader to read a Skeleton_blocker_complex.
*/
template<typename Complex>
class Skeleton_blocker_off_flag_visitor_reader {
Complex& complex_;
typedef typename Complex::Vertex_handle Vertex_handle;
typedef typename Complex::Point Point;
const bool load_only_points_;
public:
explicit Skeleton_blocker_off_flag_visitor_reader(Complex& complex, bool load_only_points = false) :
complex_(complex),
load_only_points_(load_only_points) { }
void init(int dim, int num_vertices, int num_faces, int num_edges) {
// TODO(DS): do an assert to check that this number are correctly read
// TODO(DS): reserve size for vector points
}
void point(const std::vector<double>& point) {
complex_.add_vertex(Point(point.begin(), point.end()));
}
void maximal_face(const std::vector<int>& face) {
if (!load_only_points_) {
for (size_t i = 0; i < face.size(); ++i)
for (size_t j = i + 1; j < face.size(); ++j) {
complex_.add_edge_without_blockers(Vertex_handle(face[i]), Vertex_handle(face[j]));
}
}
}
void done() { }
};
/**
*@brief Off reader visitor that can be passed to Off_reader to read a Skeleton_blocker_complex.
*/
template<typename Complex>
class Skeleton_blocker_off_visitor_reader {
Complex& complex_;
typedef typename Complex::Vertex_handle Vertex_handle;
typedef typename Complex::Simplex Simplex;
typedef typename Complex::Point Point;
const bool load_only_points_;
std::vector<Point> points_;
std::vector<Simplex> maximal_faces_;
public:
explicit Skeleton_blocker_off_visitor_reader(Complex& complex, bool load_only_points = false) :
complex_(complex),
load_only_points_(load_only_points) { }
void init(int dim, int num_vertices, int num_faces, int num_edges) {
maximal_faces_.reserve(num_faces);
points_.reserve(num_vertices);
}
void point(const std::vector<double>& point) {
points_.emplace_back(point.begin(), point.end());
}
void maximal_face(const std::vector<int>& face) {
if (!load_only_points_) {
Simplex s;
for (auto x : face)
s.add_vertex(Vertex_handle(x));
maximal_faces_.emplace_back(s);
}
}
void done() {
complex_ = make_complex_from_top_faces<Complex>(maximal_faces_.begin(), maximal_faces_.end(),
points_.begin(), points_.end());
}
};
/**
*@brief Class that allows to load a Skeleton_blocker_complex from an off file.
*/
template<typename Complex>
class Skeleton_blocker_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
*/
Skeleton_blocker_off_reader(const std::string & name_file, Complex& read_complex,
bool read_only_points = false, bool is_flag = false) : valid_(false) {
std::ifstream stream(name_file);
if (stream.is_open()) {
if (is_flag || read_only_points) {
Skeleton_blocker_off_flag_visitor_reader<Complex> off_visitor(read_complex, read_only_points);
Off_reader off_reader(stream);
valid_ = off_reader.read(off_visitor);
} else {
Skeleton_blocker_off_visitor_reader<Complex> off_visitor(read_complex, read_only_points);
Off_reader off_reader(stream);
valid_ = off_reader.read(off_visitor);
}
}
}
/**
* return true if reading did not meet problems.
*/
bool is_valid() const {
return valid_;
}
private:
bool valid_;
};
template<typename Complex>
class Skeleton_blocker_off_writer {
public:
/**
* name_file : file where the off will be written
* save_complex : complex that be outputted in the file
* for now only save triangles.
*/
Skeleton_blocker_off_writer(const std::string & name_file, const Complex& save_complex) {
typedef typename Complex::Vertex_handle Vertex_handle;
std::ofstream stream(name_file);
if (stream.is_open()) {
stream << "OFF\n";
size_t num_triangles = std::distance(save_complex.triangle_range().begin(), save_complex.triangle_range().end());
stream << save_complex.num_vertices() << " " << num_triangles << " 0 \n";
// in case the complex has deactivated some vertices, eg only has vertices 0 2 5 7 for instance
// we compute a map from 0 2 5 7 to 0 1 2 3
std::map<Vertex_handle, size_t> vertex_num;
size_t current_vertex = 0;
for (auto v : save_complex.vertex_range()) {
vertex_num[v] = current_vertex++;
const auto& pt(save_complex.point(v));
for (auto x : pt)
stream << x << " ";
stream << std::endl;
}
for (const auto & t : save_complex.triangle_range()) {
stream << "3 ";
for (auto x : t)
stream << vertex_num[x] << " ";
stream << std::endl;
}
stream.close();
} else {
std::cerr << "could not open file " << name_file << std::endl;
}
}
};
} // namespace skeleton_blocker
namespace skbl = skeleton_blocker;
} // namespace Gudhi
#endif // SKELETON_BLOCKER_SKELETON_BLOCKER_OFF_IO_H_
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