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25 //
26 //
27 //
28 // ----------------------------------------------------------------------
29 // GEANT 4 class source file
30 //
31 // G4SamplingPostStepAction.cc
32 //
33 // ----------------------------------------------------------------------
34
35 #include "G4SamplingPostStepAction.hh"
36 #include "G4Track.hh"
37 #include "G4ParticleChange.hh"
38 #include "G4VImportanceSplitExaminer.hh"
39 #include "G4Nsplit_Weight.hh"
40 #include "G4VTrackTerminator.hh"
41 #include <sstream>
42
43 G4SamplingPostStepAction::
44 G4SamplingPostStepAction(const G4VTrackTerminator &TrackTerminator)
45 : fTrackTerminator(TrackTerminator)
46 {
47 }
48
49 G4SamplingPostStepAction::~G4SamplingPostStepAction()
50 {
51 }
52
53 void G4SamplingPostStepAction::DoIt(const G4Track& aTrack,
54 G4ParticleChange *aParticleChange,
55 const G4Nsplit_Weight &nw)
56 {
57 // evaluate results from sampler
58 if (nw.fN>1)
59 {
60 // split track
61 Split(aTrack, nw, aParticleChange);
62 }
63 else if (nw.fN==1)
64 {
65 // don't split, but weight may be changed !
66 aParticleChange->ProposeWeight(nw.fW);
67 }
68 else if (nw.fN==0)
69 {
70 // kill track
71 fTrackTerminator.KillTrack();
72 }
73 else
74 {
75 // wrong answer
76 std::ostringstream os;
77 os << "Sampler returned nw = "
78 << nw
79 << "\n";
80 G4String msg = os.str();
81
82 G4Exception("G4SamplingPostStepAction::DoIt()",
83 "InvalidCondition", FatalException, msg);
84 }
85 }
86
87 void G4SamplingPostStepAction::Split(const G4Track &aTrack,
88 const G4Nsplit_Weight &nw,
89 G4ParticleChange *aParticleChange)
90 {
91 aParticleChange->ProposeWeight(nw.fW);
92 aParticleChange->SetNumberOfSecondaries(nw.fN-1);
93
94 for (G4int i=1;i<nw.fN;i++)
95 {
96 G4Track *ptrack = new G4Track(aTrack);
97
98 // ptrack->SetCreatorProcess(aTrack.GetCreatorProcess());
99 ptrack->SetWeight(nw.fW);
100
101 if (ptrack->GetMomentumDirection() != aTrack.GetMomentumDirection())
102 {
103 G4Exception("G4SamplingPostStepAction::Split()", "InvalidCondition",
104 FatalException, "Track with same momentum !");
105 }
106 aParticleChange->AddSecondary(ptrack);
107 }
108 return;
109 }
110