92 lines
2.3 KiB
C++
Executable File
92 lines
2.3 KiB
C++
Executable File
// Copyright (c) 2018 GeometryFactory Sarl (France).
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// All rights reserved.
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//
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// This file is part of CGAL (www.cgal.org).
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// You can redistribute it and/or modify it under the terms of the GNU
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// General Public License as published by the Free Software Foundation,
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// either version 3 of the License, or (at your option) any later version.
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//
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// Licensees holding a valid commercial license may use this file in
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// accordance with the commercial license agreement provided with the software.
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//
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// This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
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// WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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//
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// $URL$
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// $Id$
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// SPDX-License-Identifier: GPL-3.0+
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//
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// Author(s) : Simon Giraudot
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#ifndef CGAL_CLASSIFICATION_FEATURES_EIGENVALUE_H
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#define CGAL_CLASSIFICATION_FEATURES_EIGENVALUE_H
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#include <CGAL/license/Classification.h>
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#include <vector>
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#include <CGAL/Classification/Feature_base.h>
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#include <CGAL/Classification/Local_eigen_analysis.h>
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namespace CGAL {
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namespace Classification {
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namespace Feature {
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/*!
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\ingroup PkgClassificationFeatures
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%Feature based on the eigenvalues of the covariance matrix of a
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local neighborhood.
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Its default name is "eigenvalue_0", "eigenvalue_1" or
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"eigenvalue_2", depending on which eigenvalue is chosen in the
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constructor.
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*/
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class Eigenvalue : public Feature_base
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{
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protected:
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const Classification::Local_eigen_analysis& eigen;
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unsigned int m_idx;
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public:
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/*!
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Constructs the feature.
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\tparam Input model of `ConstRange`. Its iterator type
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is `RandomAccessIterator`.
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\param input input range.
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\param eigen class with precomputed eigenvectors and eigenvalues.
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\param idx index of the eigen value (0, 1 or 2).
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*/
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template <typename InputRange>
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Eigenvalue (const InputRange& input,
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const Classification::Local_eigen_analysis& eigen,
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unsigned int idx)
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: eigen (eigen), m_idx (idx)
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{
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CGAL_USE(input);
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std::ostringstream oss;
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oss << "eigenvalue" << idx;
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this->set_name (oss.str());
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}
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/// \cond SKIP_IN_MANUAL
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virtual float value (std::size_t pt_index)
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{
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return eigen.eigenvalue(pt_index)[std::size_t(m_idx)];
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}
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/// \endcond
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};
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} // namespace Feature
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} // namespace Classification
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} // namespace CGAL
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#endif // CGAL_CLASSIFICATION_FEATURES_EIGENVALUE_H
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