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25 //
26 // G4ParticleChangeForMSC
27 //
28 // Class description:
29 //
30 // Concrete "Particle Change" class for Multiple Scattering process.
31
32 // Author: Hisaya Kurashige, 23 March 1998
33 // Revision: Vladimir Ivantchenko, 16 January 2004
34 // 23 August 2022
35 // --------------------------------------------------------------------
36 #ifndef G4ParticleChangeForMSC_hh
37 #define G4ParticleChangeForMSC_hh 1
38
39 #include "globals.hh"
40 #include "G4ios.hh"
41 #include "G4ThreeVector.hh"
42 #include "G4VParticleChange.hh"
43
44 class G4ParticleChangeForMSC final : public G4VParticleChange
45 {
46 public:
47
48 G4ParticleChangeForMSC();
49
50 ~G4ParticleChangeForMSC() override = default;
51
52 G4ParticleChangeForMSC(const G4ParticleChangeForMSC& right) = delete;
53 G4ParticleChangeForMSC& operator=
54 (const G4ParticleChangeForMSC& right) = delete;
55
56 // A multiple scattering process gives the final state of the particle
57 G4Step* UpdateStepForAlongStep(G4Step* step) final;
58
59 // Initialise only properties changed by multiple scattering
60 inline void InitialiseMSC(const G4Track&, const G4Step& step);
61
62 inline void ProposeMomentumDirection(const G4ThreeVector& Pfinal);
63 inline const G4ThreeVector* GetProposedMomentumDirection() const;
64
65 inline void ProposePosition(const G4ThreeVector& finalPosition);
66 inline const G4ThreeVector& GetProposedPosition() const;
67
68 private:
69
70 G4ThreeVector theMomentumDirection;
71 // It is the vector containing the final momentum direction
72 // after multiple scattering is applied along step
73
74 G4ThreeVector thePosition;
75 // The changed of post step position after multiple scattering
76 };
77
78 inline void G4ParticleChangeForMSC::ProposeMomentumDirection(
79 const G4ThreeVector& P)
80 {
81 theMomentumDirection = P;
82 }
83
84 inline const G4ThreeVector*
85 G4ParticleChangeForMSC::GetProposedMomentumDirection() const
86 {
87 return &theMomentumDirection;
88 }
89
90 inline void G4ParticleChangeForMSC::ProposePosition(const G4ThreeVector& P)
91 {
92 thePosition = P;
93 }
94
95 inline const G4ThreeVector& G4ParticleChangeForMSC::GetProposedPosition() const
96 {
97 return thePosition;
98 }
99
100 inline void
101 G4ParticleChangeForMSC::InitialiseMSC(const G4Track& track, const G4Step& step)
102 {
103 theStatusChange = track.GetTrackStatus();
104 auto poststep = step.GetPostStepPoint();
105 thePosition = poststep->GetPosition();
106 theMomentumDirection = poststep->GetMomentumDirection();
107 theCurrentTrack = &track;
108 }
109
110 #endif
111