//-----------------------------------------------------------
// File and Version Information:
// $Id$
//
// Description:
//      Track on Riemann Sphere
//      Circle parameters can be calculated from plane parameters
//      plane(c,nx,ny,nz);
//
//
// Environment:
//      Software developed for the PANDA Detector at FAIR.
//
// Author List:
//      Sebastian Neubert    TUM            (original author)
//
//
//-----------------------------------------------------------

#ifndef TPCRIEMANNTRACK_HH
#define TPCRIEMANNTRACK_HH

// Base Class Headers ----------------
#include "TObject.h"

// Collaborating Class Headers -------
#include <vector>
#include "TVectorD.h"

// Collaborating Class Declarations --
class PndTpcRiemannHit;


class PndTpcRiemannTrack : public TObject{
public:

  // Constructors/Destructors ---------
  PndTpcRiemannTrack();
  ~PndTpcRiemannTrack(){;}

  
  // Accessors -----------------------
  const TVectorD& n() const {return _n;}
  double c() const {return _c;}
  const TVectorD& av() const {return _av;}

  TVectorD orig() const;
  double r() const;
  double dip() const;
  double sign() const;
  unsigned int getNumHits() const {return _hits.size();}
  PndTpcRiemannHit* getHit(unsigned int i) const {return _hits[i];}
  PndTpcRiemannHit* getLastHit() const {return getHit(getNumHits()-1);}

  double m() const {return _m;}
  double t() const {return _t;}

  // Modifiers -----------------------
  void addHit(PndTpcRiemannHit* hit);

  // Operations ----------------------
  void refit();
  double dist(PndTpcRiemannHit* hit);
  void szFit();
  double szDist(PndTpcRiemannHit* hit);

private:

  // Private Data Members ------------
  TVectorD _n;  // normal vector to plane;
  double _c;     // distance of plane to origin

  double _m; //parameters of sz-fit
  double _t;

  std::vector<PndTpcRiemannHit*> _hits; //!
  TVectorD _av;  // average over all hits


  // Private Methods -----------------
 

public:
  ClassDef(PndTpcRiemannTrack,1)

};

#endif

//--------------------------------------------------------------
// $Log$
//--------------------------------------------------------------