Dnn4piCylinder.hh

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// $Id: Dnn4piCylinder.hh 431 2007-01-20 10:44:55Z salam $
//
// Copyright (c) 2005-2006, Matteo Cacciari and Gavin Salam
//
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#ifndef DROP_CGAL // in case we do not have the code for CGAL
#ifndef __FASTJET_DNN4PICYLINDER_HH__
#define __FASTJET_DNN4PICYLINDER_HH__

#include "fastjet/internal/DynamicNearestNeighbours.hh"
#include "fastjet/internal/DnnPlane.hh"
#include "fastjet/internal/numconsts.hh"

FASTJET_BEGIN_NAMESPACE      // defined in fastjet/internal/base.hh

class Dnn4piCylinder : public DynamicNearestNeighbours {
 public:
  Dnn4piCylinder() {}

  Dnn4piCylinder(const std::vector<EtaPhi> &, const bool & verbose = false );

  int NearestNeighbourIndex(const int & ii) const ;

  double NearestNeighbourDistance(const int & ii) const ;

  bool Valid(const int & index) const;

  void RemoveAndAddPoints(const std::vector<int> & indices_to_remove,
                          const std::vector<EtaPhi> & points_to_add,
                          std::vector<int> & indices_added,
                          std::vector<int> & indices_of_updated_neighbours);

  ~Dnn4piCylinder();

 private:

  bool _verbose;

  // NB: we define POINTERS here because the initialisation gave
  //     us problems (things crashed!), perhaps because in practice
  //     we were making a copy without being careful and defining
  //     a proper copy constructor.
  DnnPlane * _DNN1, * _DNN2;

  inline EtaPhi _remap_phi(const EtaPhi & point) {
    double phi = point.second;
    if (phi < pi) { phi += twopi ;}
    return EtaPhi(point.first, phi);}

};


// here follow some inline implementations of the simpler of the
// functions defined above

inline int Dnn4piCylinder::NearestNeighbourIndex(const int & current) const {
  return (_DNN1->NearestNeighbourDistance(current) < 
          _DNN2->NearestNeighbourDistance(current)) ? 
    _DNN1->NearestNeighbourIndex(current) : 
    _DNN2->NearestNeighbourIndex(current) ; 
}

inline double Dnn4piCylinder::NearestNeighbourDistance(const int & current) const {
  return (_DNN1->NearestNeighbourDistance(current) < 
          _DNN2->NearestNeighbourDistance(current)) ? 
    _DNN1->NearestNeighbourDistance(current) : 
    _DNN2->NearestNeighbourDistance(current) ; 
}

inline bool Dnn4piCylinder::Valid(const int & index) const {
  return (_DNN1->Valid(index) && _DNN2->Valid(index));
}


inline Dnn4piCylinder::~Dnn4piCylinder() {
  delete _DNN1; 
  delete _DNN2;
}


FASTJET_END_NAMESPACE

#endif //  __FASTJET_DNN4PICYLINDER_HH__
#endif //  DROP_CGAL 

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