blob: b22f4db6dab9e9e939b3dda03148c5dbd6893862 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
|
/* 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 Sophia Antipolis-Mediterranee (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 UTILS_RIPS_BUILDER_H_
#define UTILS_RIPS_BUILDER_H_
#include <boost/iterator/iterator_facade.hpp>
#include <CGAL/Euclidean_distance.h>
#include <CGAL/Orthogonal_k_neighbor_search.h>
#include <CGAL/Search_traits_d.h>
#include "utils/UI_utils.h"
#include "model/Complex_typedefs.h"
template<typename SkBlComplex> class Rips_builder {
private:
SkBlComplex& complex_;
public:
/**
* @brief Modify complex to be the Rips complex
* of its points with offset alpha.
*/
Rips_builder(SkBlComplex& complex, double alpha) : complex_(complex) {
complex.keep_only_vertices();
if (alpha <= 0) return;
compute_edges(alpha);
}
private:
double squared_eucl_distance(const Point& p1, const Point& p2) const {
return Geometry_trait::Squared_distance_d()(p1, p2);
}
void compute_edges(double alpha) {
auto vertices = complex_.vertex_range();
for (auto p = vertices.begin(); p != vertices.end(); ++p) {
std::cout << *p << " ";
std::cout.flush();
for (auto q = p; ++q != vertices.end(); /**/)
if (squared_eucl_distance(complex_.point(*p), complex_.point(*q)) < 4 * alpha * alpha)
complex_.add_edge(*p, *q);
}
std::cout << std::endl;
}
};
#endif // UTILS_RIPS_BUILDER_H_
|