Geant4_10
G4ErrorFreeTrajState.hh
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27 // $Id: G4ErrorFreeTrajState.hh 66892 2013-01-17 10:57:59Z gunter $
28 //
29 // Class Description:
30 //
31 // Represents a free G4ErrorTrajState
32 // It can be represented by the 5 variables
33 // 1/p, lambda, phi, y_perp, z_perp
34 // where lambda and phi are the dip and azimuthal angles related
35 // to the momentum components in the following way:
36 // p_x = p cos(lambda) cos(phi) ! lambda = 90 - theta
37 // p_y = p cos(lambda) sin(phi)
38 // p_z = p sin(lambda)
39 // y_perp and z_perp are the coordinates of the trajectory in a
40 // local orthonormal reference frame with the x_perp axis along the
41 // particle direction, the y_perp being parallel to the x-y plane.
42 //
43 // This class also takes care of propagating the error associated to
44 // the trajectory
45 
46 // History:
47 // - Created: P. Arce
48 // --------------------------------------------------------------------
49 
50 #ifndef G4ErrorFreeTrajState_hh
51 #define G4ErrorFreeTrajState_hh
52 
53 #include "globals.hh"
54 
55 #include "G4ErrorMatrix.hh"
56 
57 #include "G4ErrorTrajState.hh"
58 #include "G4ErrorFreeTrajParam.hh"
59 
60 #include "G4Point3D.hh"
61 #include "G4Vector3D.hh"
62 
64 
66 {
67  public: // with description
68 
69  G4ErrorFreeTrajState() : theFirstStep(true) {}
70  G4ErrorFreeTrajState( const G4String& partName,
71  const G4Point3D& pos,
72  const G4Vector3D& mom,
73  const G4ErrorTrajErr& errmat = G4ErrorTrajErr(5,0) );
74  // Constructor by providing particle, position and momentum
75 
77  // Constructor by providing G4ErrorSurfaceTrajState
78 
80 
81  virtual G4int Update( const G4Track* aTrack );
82  // update parameters from G4Track
83 
84  virtual G4int PropagateError( const G4Track* aTrack );
85  // propagate the error along the step
86 
87  virtual void Dump( std::ostream& out = G4cout ) const;
88  // dump TrajState parameters
89 
90  friend
91  std::ostream& operator<<(std::ostream&, const G4ErrorFreeTrajState& ts);
92 
93  // Set and Get methods
94 
95  virtual void SetPosition( const G4Point3D pos )
96  { SetParameters( pos, fMomentum ); }
97 
98  virtual void SetMomentum( const G4Vector3D& mom )
99  { SetParameters( fPosition, mom ); }
100 
101  void SetParameters( const G4Point3D& pos, const G4Vector3D& mom )
102  {
103  fPosition = pos;
104  fMomentum = mom;
105  fTrajParam.SetParameters( pos, mom );
106  }
107 
109  { return fTrajParam; }
110 
112  { return theTransfMat; }
113 
114  private:
115 
116  void Init();
117  // define TrajState type and build charge
118 
119  G4int PropagateErrorMSC( const G4Track* aTrack );
120  // add the error associated to multiple scattering
121 
122  void CalculateEffectiveZandA( const G4Material* mate, double& effZ, double& effA );
123  // calculate effective Z and A (needed by PropagateErrorMSC)
124 
125  G4int PropagateErrorIoni( const G4Track* aTrack );
126  // add the error associated to ionization energy loss
127 
128 
129  private:
130 
131  G4ErrorFreeTrajParam fTrajParam;
132 
133  G4ErrorMatrix theTransfMat;
134 
135  G4bool theFirstStep; // to count if transf mat is updated or initialized
136 };
137 
138 #endif
G4ErrorSymMatrix G4ErrorTrajErr
virtual void SetPosition(const G4Point3D pos)
void SetParameters(const G4Point3D &pos, const G4Vector3D &mom)
friend std::ostream & operator<<(std::ostream &, const G4ErrorFreeTrajState &ts)
void SetParameters(const G4Point3D &pos, const G4Vector3D &mom)
int G4int
Definition: G4Types.hh:78
G4GLOB_DLL std::ostream G4cout
virtual void Dump(std::ostream &out=G4cout) const
bool G4bool
Definition: G4Types.hh:79
virtual void SetMomentum(const G4Vector3D &mom)
G4ErrorMatrix GetTransfMat() const
virtual G4int Update(const G4Track *aTrack)
virtual G4int PropagateError(const G4Track *aTrack)
G4ErrorFreeTrajParam GetParameters() const