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/* This file is part of the Gudhi Library - https://gudhi.inria.fr/ - which is released under MIT.
* See file LICENSE or go to https://gudhi.inria.fr/licensing/ for full license details.
* Author(s): Siargey Kachanovich
*
* Copyright (C) 2015 Inria
*
* Modification(s):
* - 2019/08 Vincent Rouvreau: Fix issue #10 for CGAL and Eigen3
* - YYYY/MM Author: Description of the modification
*/
#ifndef EUCLIDEAN_WITNESS_COMPLEX_H_
#define EUCLIDEAN_WITNESS_COMPLEX_H_
#include <gudhi/Witness_complex.h>
#include <gudhi/Active_witness/Active_witness.h>
#include <gudhi/Kd_tree_search.h>
#include <CGAL/version.h> // for CGAL_VERSION_NR
#include <Eigen/src/Core/util/Macros.h> // for EIGEN_VERSION_AT_LEAST
#include <utility>
#include <vector>
#include <list>
#include <limits>
// Make compilation fail - required for external projects - https://github.com/GUDHI/gudhi-devel/issues/10
#if CGAL_VERSION_NR < 1041101000
# error Alpha_complex_3d is only available for CGAL >= 4.11
#endif
#if !EIGEN_VERSION_AT_LEAST(3,1,0)
# error Alpha_complex_3d is only available for Eigen3 >= 3.1.0 installed with CGAL
#endif
namespace Gudhi {
namespace witness_complex {
/**
* \private
* \class Euclidean_witness_complex
* \brief Constructs (weak) witness complex for given sets of witnesses and landmarks in Euclidean space.
* \ingroup witness_complex
*
* \tparam Kernel_ requires a <a target="_blank"
* href="http://doc.cgal.org/latest/Kernel_d/classCGAL_1_1Epick__d.html">CGAL::Epick_d</a> class.
*/
template< class Kernel_ >
class Euclidean_witness_complex
: public Witness_complex<std::vector<typename Gudhi::spatial_searching::Kd_tree_search<Kernel_,
std::vector<typename Kernel_::Point_d>>::INS_range>> {
private:
typedef Kernel_ K;
typedef typename K::Point_d Point_d;
typedef std::vector<Point_d> Point_range;
typedef Gudhi::spatial_searching::Kd_tree_search<Kernel_, Point_range> Kd_tree;
typedef typename Kd_tree::INS_range Nearest_landmark_range;
typedef typename std::vector<Nearest_landmark_range> Nearest_landmark_table;
typedef typename Nearest_landmark_range::Point_with_transformed_distance Id_distance_pair;
typedef typename Id_distance_pair::first_type Landmark_id;
typedef Landmark_id Vertex_handle;
private:
Point_range landmarks_;
Kd_tree landmark_tree_;
using Witness_complex<Nearest_landmark_table>::nearest_landmark_table_;
public:
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
/* @name Constructor
*/
//@{
/**
* \brief Initializes member variables before constructing simplicial complex.
* \details Records landmarks from the range 'landmarks' into a
* table internally, as well as witnesses from the range 'witnesses'.
* Both ranges should have value_type Kernel_::Point_d.
*/
template< typename LandmarkRange,
typename WitnessRange >
Euclidean_witness_complex(const LandmarkRange & landmarks,
const WitnessRange & witnesses)
: landmarks_(std::begin(landmarks), std::end(landmarks)), landmark_tree_(landmarks) {
nearest_landmark_table_.reserve(boost::size(witnesses));
for (auto w : witnesses)
nearest_landmark_table_.push_back(landmark_tree_.incremental_nearest_neighbors(w));
}
/** \brief Returns the point corresponding to the given vertex.
* @param[in] vertex Vertex handle of the point to retrieve.
*/
Point_d get_point(Vertex_handle vertex) const {
return landmarks_[vertex];
}
//@}
};
} // namespace witness_complex
} // namespace Gudhi
#endif // EUCLIDEAN_WITNESS_COMPLEX_H_
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