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//-----------------------------------------------------------------------------
// $Id: T3DLine.h,v 1.11 2010/03/31 09:58:59 liucy Exp $
//-----------------------------------------------------------------------------
// Filename : T3DLine.h
// Section  : Tracking
// Owner    : Kenji Inami
// Email    : inami@bmail.kek.jp
//-----------------------------------------------------------------------------
// Description : A class to represent a 3D line in tracking
//               See http://bsunsrv1.kek.jp/~yiwasaki/tracking/
//-----------------------------------------------------------------------------

#ifdef TRKRECO_DEBUG_DETAIL
#ifndef TRKRECO_DEBUG
#define TRKRECO_DEBUG
#endif
#endif
#ifndef T3DLine_FLAG_
#define T3DLine_FLAG_

#define Line3D  32
// This must be writen in TTrackBase.h

#include <string>

#define HEP_SHORT_NAMES
#ifndef CLHEP_POINT3D_H
#include "CLHEP/Geometry/Point3D.h"
#endif
#ifndef ENABLE_BACKWARDS_COMPATIBILITY
    typedef HepGeom::Point3D<double> HepPoint3D;
#endif
#ifndef CLHEP_VECTOR3D_H
#include "CLHEP/Geometry/Vector3D.h"
#endif
#ifndef ENABLE_BACKWARDS_COMPATIBILITY
    typedef HepGeom::Vector3D<double> HepVector3D;
#endif

//#include "helix/Helix.h"
#include "TrackUtil/Helix.h"
//#include "TrkReco/Helix.h"
#include "TrkReco/TTrackBase.h"

class T3DLineFitter;
class TTrack;
class TMLink;

class T3DLine : public TTrackBase {

public:
  T3DLine();
  T3DLine(const TTrack&);
  T3DLine(const T3DLine&);

  virtual ~T3DLine();

public:// Extractors
  double dr(void) const;
  double phi0(void) const;
  double dz(void) const;
  double tanl(void) const;

  double cosPhi0(void) const;
  double sinPhi0(void) const;

  Vector a(void) const;         //dr,phi0,dz,tanl

  const SymMatrix& Ea(void) const;

  const HepPoint3D & pivot(void) const;

  Helix helix(void) const;

  unsigned ndf(void) const;

  double chi2(void) const;

  double reducedchi2(void) const;

  unsigned objectType(void) const;

public:// Executors

public:// Utilities
  HepPoint3D x(double) const;

  HepPoint3D x0(void) const;
//zsl  Vector3 k(void) const; 
  HepVector3D k(void) const;

  int approach(TMLink &, bool sagCorrection = true) const;

  int approach_line(const HepPoint3D&,const HepVector3D&,
                    HepPoint3D& onLine,HepPoint3D& onTrack) const;

  int approach_point(const HepPoint3D&,HepPoint3D& onTrack) const;

public:// Modifiers
  const HepPoint3D & pivot(const HepPoint3D&);

  void set(const HepPoint3D&,double t_dr,double t_phi0,double t_dz,double t_tanl);

  Vector a(const Vector&);

  const SymMatrix& Ea(const SymMatrix&);

private:
  HepPoint3D _pivot;
  // Updated when fitted
  double _dr;
  double _phi0;
  double _dz;
  double _tanl;

  SymMatrix _Ea;

  double _chi2;
  unsigned _ndf;

  //Cashe
  double _cos_phi0;
  double _sin_phi0;

  static const T3DLineFitter _fitter;

  friend class T3DLineFitter;
};

inline unsigned T3DLine::objectType(void) const{
  return Line3D;
}

#endif /* T3DLine_FLAG_ */

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