nn_search.h

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#ifndef GEOGRAM_POINTS_NN_SEARCH
#define GEOGRAM_POINTS_NN_SEARCH
 
#include <geogram/basic/common.h>
#include <geogram/basic/numeric.h>
#include <geogram/basic/smart_pointer.h>
#include <geogram/basic/counted.h>
#include <geogram/basic/factory.h>
 
namespace GEO {
 
    class GEOGRAM_API NearestNeighborSearch : public Counted {
    public:
        static NearestNeighborSearch* create(
            coord_index_t dimension, const std::string& name = "default"
        );
 
        virtual void set_points(index_t nb_points, const double* points);
 
        virtual bool stride_supported() const;
 
        virtual void set_points(
            index_t nb_points, const double* points, index_t stride
        );
 
        virtual void get_nearest_neighbors(
            index_t nb_neighbors,
            const double* query_point,
            index_t* neighbors,
            double* neighbors_sq_dist
        ) const = 0;
 
 
        struct KeepInitialValues {
        };
 
        virtual void get_nearest_neighbors(
            index_t nb_neighbors,
            const double* query_point,
            index_t* neighbors,
            double* neighbors_sq_dist,
            KeepInitialValues dummy
        ) const;
 
        virtual void get_nearest_neighbors(
            index_t nb_neighbors,
            index_t query_point,
            index_t* neighbors,
            double* neighbors_sq_dist
        ) const;
 
        index_t get_nearest_neighbor(
            const double* query_point
        ) const {
            index_t result;
            double sq_dist;
            get_nearest_neighbors(1, query_point, &result, &sq_dist);
            geo_assert(signed_index_t(result) >= 0);
            return index_t(result);
        }
 
        coord_index_t dimension() const {
            return dimension_;
        }
 
        index_t nb_points() const {
            return nb_points_;
        }
 
        const double* point_ptr(index_t i) const {
            geo_debug_assert(i < nb_points());
            return points_ + i * stride_;
        }
 
        bool exact() const {
            return exact_;
        }
 
        virtual void set_exact(bool x);
 
    protected:
        NearestNeighborSearch(coord_index_t dimension);
 
        ~NearestNeighborSearch() override;
 
    protected:
        coord_index_t dimension_;
        index_t nb_points_;
        index_t stride_;
        const double* points_;
        bool exact_;
    };
 
    typedef SmartPointer<NearestNeighborSearch> NearestNeighborSearch_var;
 
    typedef Factory1<NearestNeighborSearch, coord_index_t>
    NearestNeighborSearchFactory;
 
#define geo_register_NearestNeighborSearch_creator(type, name)          \
    geo_register_creator(GEO::NearestNeighborSearchFactory, type, name)
}
 
#endif