G4ErrorFreeTrajParam.hh

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// $Id$
//
// Class Description:
//
// Holds the 5 independent variables of the trajectory for a
// G4ErrorFreeTrajState object. It is not used for anything but for
// printing, but anyhow it is updated everytime the position and
// momentum are updated.
 
// History:
// - Created: Pedro Arce, September 2004
// --------------------------------------------------------------------
 
#ifndef G4ErrorFreeTrajParam_hh
#define G4ErrorFreeTrajParam_hh
 
#include "G4Point3D.hh"
#include "G4Vector3D.hh"
 
#include "globals.hh"
#include "G4Track.hh"
 
class G4ErrorFreeTrajParam
{
 public:  // with description
 
  G4ErrorFreeTrajParam()
   : fInvP(0.), fLambda(0.), fPhi(0.), fYPerp(0.), fZPerp(0.){}
  G4ErrorFreeTrajParam( const G4Point3D& pos, const G4Vector3D& mom );
    // build parameters from position and momentum
 
  virtual ~G4ErrorFreeTrajParam(){}
 
  void Update( const G4Track* aTrack );
    // update parameters from G4Track
 
  friend
    std::ostream& operator<<(std::ostream&, const G4ErrorFreeTrajParam& ts);
  
  // Set and Get methods 
 
  void SetParameters( const G4Point3D& pos, const G4Vector3D& mom );
 
  G4Vector3D GetDirection() const { return fDir;}
 
  G4double GetInvP() const { return fInvP; }
  G4double GetLambda() const { return fLambda; }
  G4double GetPhi() const { return fPhi; }
  G4double GetYPerp() const { return fYPerp; }
  G4double GetZPerp() const { return fZPerp; }
 
 private:
 
  G4Vector3D fDir; //direction to which YPerp, ZPerp refer
  G4double fInvP; // inverse of momentum
  G4double fLambda; // 90 - theta angle of direction
  G4double fPhi; // phi angle of direction
  G4double fYPerp; // Y coordinate
  G4double fZPerp; // Z coordinate
};
 
#endif