include/Geant4/G4ParticleChangeForMSC.hh

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0025 //
0026 // G4ParticleChangeForMSC
0027 //
0028 // Class description:
0029 //
0030 // Concrete "Particle Change" class for Multiple Scattering process.
0031
0032 // Author: Hisaya Kurashige, 23 March 1998
0033 // Revision: Vladimir Ivantchenko, 16 January 2004
0034 //                                 23 August 2022
0035 // --------------------------------------------------------------------
0036 #ifndef G4ParticleChangeForMSC_hh
0037 #define G4ParticleChangeForMSC_hh 1
0038
0039 #include "globals.hh"
0040 #include "G4ios.hh"
0041 #include "G4ThreeVector.hh"
0042 #include "G4VParticleChange.hh"
0043
0044 class G4ParticleChangeForMSC final : public G4VParticleChange
0045 {
0046 public:
0047
0048   G4ParticleChangeForMSC();
0049
0050   ~G4ParticleChangeForMSC() override = default;
0051
0052   G4ParticleChangeForMSC(const G4ParticleChangeForMSC& right) = delete;
0053   G4ParticleChangeForMSC& operator=
0054   (const G4ParticleChangeForMSC& right) = delete;
0055
0056   // A multiple scattering process gives the final state of the particle
0057   G4Step* UpdateStepForAlongStep(G4Step* step) final;
0058
0059   // Initialise only properties changed by multiple scattering
0060   inline void InitialiseMSC(const G4Track&, const G4Step& step);
0061
0062   inline void ProposeMomentumDirection(const G4ThreeVector& Pfinal);
0063   inline const G4ThreeVector* GetProposedMomentumDirection() const;
0064
0065   inline void ProposePosition(const G4ThreeVector& finalPosition);
0066   inline const G4ThreeVector& GetProposedPosition() const;
0067
0068 private:
0069
0070   G4ThreeVector theMomentumDirection;
0071   // It is the vector containing the final momentum direction
0072   // after multiple scattering is applied along step
0073
0074   G4ThreeVector thePosition;
0075   // The changed of post step position after multiple scattering
0076 };
0077
0078 inline void G4ParticleChangeForMSC::ProposeMomentumDirection(
0079   const G4ThreeVector& P)
0080 {
0081   theMomentumDirection = P;
0082 }
0083
0084 inline const G4ThreeVector*
0085 G4ParticleChangeForMSC::GetProposedMomentumDirection() const
0086 {
0087   return &theMomentumDirection;
0088 }
0089
0090 inline void G4ParticleChangeForMSC::ProposePosition(const G4ThreeVector& P)
0091 {
0092   thePosition = P;
0093 }
0094
0095 inline const G4ThreeVector& G4ParticleChangeForMSC::GetProposedPosition() const
0096 {
0097   return thePosition;
0098 }
0099
0100 inline void
0101 G4ParticleChangeForMSC::InitialiseMSC(const G4Track& track, const G4Step& step)
0102 {
0103   theStatusChange = track.GetTrackStatus();
0104   auto poststep = step.GetPostStepPoint();
0105   thePosition = poststep->GetPosition();
0106   theMomentumDirection = poststep->GetMomentumDirection();
0107   theCurrentTrack = &track;
0108 }
0109
0110 #endif