LFS.h

Go to the documentation of this file.

/*
 *  Copyright (c) 2000-2022 Inria
 *  All rights reserved.
 *
 *  Redistribution and use in source and binary forms, with or without
 *  modification, are permitted provided that the following conditions are met:
 *
 *  * Redistributions of source code must retain the above copyright notice,
 *  this list of conditions and the following disclaimer.
 *  * Redistributions in binary form must reproduce the above copyright notice,
 *  this list of conditions and the following disclaimer in the documentation
 *  and/or other materials provided with the distribution.
 *  * Neither the name of the ALICE Project-Team nor the names of its
 *  contributors may be used to endorse or promote products derived from this
 *  software without specific prior written permission.
 *
 *  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 *  AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 *  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 *  ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
 *  LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 *  INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 *  CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 *  ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 *  POSSIBILITY OF SUCH DAMAGE.
 *
 *  Contact: Bruno Levy
 *
 *     https://www.inria.fr/fr/bruno-levy
 *
 *     Inria,
 *     Domaine de Voluceau,
 *     78150 Le Chesnay - Rocquencourt
 *     FRANCE
 *
 */
 
#ifndef GEOGRAM_DELAUNAY_LFS
#define GEOGRAM_DELAUNAY_LFS
 
#include <geogram/basic/common.h>
#include <geogram/delaunay/delaunay.h>
 
namespace GEO {
 
    class GEOGRAM_API LocalFeatureSize {
    public:
    LocalFeatureSize(index_t nb_pts, const double* pts) {
        sliver_angle_threshold_ = 0.01;
        init(nb_pts, pts);
    }
 
    double squared_lfs(const double* p) const {
        index_t v = spatial_search_->nearest_vertex(p);
        const double* q = spatial_search_->vertex_ptr(v);
        return
            geo_sqr(p[0] - q[0]) +
            geo_sqr(p[1] - q[1]) +
            geo_sqr(p[2] - q[2]);
    }
 
    index_t nb_poles() const {
        return poles_.size()/3;
    }
 
    const double* pole(index_t i) const {
        geo_debug_assert(i < nb_poles());
        return &poles_[3*i];
    }
 
    protected:
    void init(index_t nb_pts, const double* pts);
 
    private:
    double sliver_angle_threshold_;
    vector<double> poles_;
    Delaunay_var spatial_search_;
    };
}
 
#endif