DnnPlane.hh

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//STARTHEADER
// $Id: DnnPlane.hh 431 2007-01-20 10:44:55Z salam $
//
// Copyright (c) 2005-2006, Matteo Cacciari and Gavin Salam
//
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// This file is part of FastJet.
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#ifndef DROP_CGAL // in case we do not have the code for CGAL

#ifndef __FASTJET_DNNPLANE_HH__
#define __FASTJET_DNNPLANE_HH__

#include "fastjet/internal/Triangulation.hh"
#include "fastjet/internal/DynamicNearestNeighbours.hh"

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


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

  DnnPlane(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);

  EtaPhi etaphi(const int i) const;
  double eta(const int i) const;
  double phi(const int i) const;

 private:

  struct SuperVertex {
    Vertex_handle vertex; // NULL indicates inexistence...
    double NNdistance;
    int NNindex;
    // later on for cylinder put a second vertex?
  };

  std::vector<SuperVertex> _supervertex;
  //set<Vertex_handle> _vertex_set;
  bool _verbose;

  static const bool _crash_on_coincidence = true;
  //static const bool _crash_on_coincidence = false;

  Triangulation _TR; 

  inline double _euclid_distance(const Point& p1, const Point& p2) const {
    double distx= p1.x()-p2.x();
    double disty= p1.y()-p2.y();
    return distx*distx+disty*disty;
  }

  //---------------------------------------------------------------------- 
  void _SetNearest(const int & j);

  //----------------------------------------------------------------------
  void _SetAndUpdateNearest(const int & j, 
                            std::vector<int> & indices_of_updated_neighbours);

  void _CrashIfVertexPresent(const Vertex_handle & vertex, 
                             const int & its_index);

};


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

inline int DnnPlane::NearestNeighbourIndex(const int & ii) const {
  return _supervertex[ii].NNindex;}

inline double DnnPlane::NearestNeighbourDistance(const int & ii) const {
  return _supervertex[ii].NNdistance;}

inline bool DnnPlane::Valid(const int & index) const {
  if (index >= 0 && index < static_cast<int>(_supervertex.size())) {
    return (_supervertex[index].vertex != NULL);} else {return false;} }

inline EtaPhi DnnPlane::etaphi(const int i) const {
  Point * p = & (_supervertex[i].vertex->point());
  return EtaPhi(p->x(),p->y()); }

inline double DnnPlane::eta(const int i) const {
  return _supervertex[i].vertex->point().x(); }

inline double DnnPlane::phi(const int i) const {
  return _supervertex[i].vertex->point().y(); }


FASTJET_END_NAMESPACE

#endif //  __FASTJET_DNNPLANE_HH__

#endif // DROP_CGAL

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