1 | // |
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2 | // ******************************************************************** |
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3 | // * License and Disclaimer * |
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4 | // * * |
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5 | // * The Geant4 software is copyright of the Copyright Holders of * |
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6 | // * the Geant4 Collaboration. It is provided under the terms and * |
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7 | // * conditions of the Geant4 Software License, included in the file * |
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8 | // * LICENSE and available at http://cern.ch/geant4/license . These * |
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9 | // * include a list of copyright holders. * |
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10 | // * * |
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11 | // * Neither the authors of this software system, nor their employing * |
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12 | // * institutes,nor the agencies providing financial support for this * |
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13 | // * work make any representation or warranty, express or implied, * |
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14 | // * regarding this software system or assume any liability for its * |
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15 | // * use. Please see the license in the file LICENSE and URL above * |
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16 | // * for the full disclaimer and the limitation of liability. * |
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17 | // * * |
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18 | // * This code implementation is the result of the scientific and * |
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19 | // * technical work of the GEANT4 collaboration. * |
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20 | // * By using, copying, modifying or distributing the software (or * |
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21 | // * any work based on the software) you agree to acknowledge its * |
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22 | // * use in resulting scientific publications, and indicate your * |
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23 | // * acceptance of all terms of the Geant4 Software license. * |
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24 | // ******************************************************************** |
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25 | // |
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26 | // |
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27 | // $Id: G4SamplingPostStepAction.cc,v 1.3 2008/04/21 09:10:29 ahoward Exp $ |
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28 | // GEANT4 tag $Name: geant4-09-02 $ |
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29 | // |
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30 | // ---------------------------------------------------------------------- |
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31 | // GEANT 4 class source file |
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32 | // |
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33 | // G4SamplingPostStepAction.cc |
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34 | // |
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35 | // ---------------------------------------------------------------------- |
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36 | |
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37 | #include "G4SamplingPostStepAction.hh" |
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38 | #include "G4Track.hh" |
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39 | #include "G4ParticleChange.hh" |
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40 | #include "G4VImportanceSplitExaminer.hh" |
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41 | #include "G4Nsplit_Weight.hh" |
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42 | #include "G4VTrackTerminator.hh" |
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43 | #include <sstream> |
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44 | |
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45 | G4SamplingPostStepAction:: |
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46 | G4SamplingPostStepAction(const G4VTrackTerminator &TrackTerminator) |
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47 | : fTrackTerminator(TrackTerminator) |
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48 | { |
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49 | } |
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50 | |
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51 | G4SamplingPostStepAction::~G4SamplingPostStepAction() |
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52 | { |
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53 | } |
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54 | |
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55 | void G4SamplingPostStepAction::DoIt(const G4Track& aTrack, |
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56 | G4ParticleChange *aParticleChange, |
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57 | const G4Nsplit_Weight &nw) |
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58 | { |
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59 | // evaluate results from sampler |
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60 | if (nw.fN>1) |
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61 | { |
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62 | // split track |
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63 | Split(aTrack, nw, aParticleChange); |
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64 | } |
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65 | else if (nw.fN==1) |
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66 | { |
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67 | // don't split, but weight may be changed ! |
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68 | aParticleChange->ProposeWeight(nw.fW); |
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69 | } |
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70 | else if (nw.fN==0) |
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71 | { |
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72 | // kill track |
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73 | fTrackTerminator.KillTrack(); |
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74 | } |
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75 | else |
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76 | { |
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77 | // wrong answer |
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78 | std::ostringstream os; |
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79 | os << "Sampler returned nw = " |
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80 | << nw |
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81 | << "\n"; |
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82 | G4String m = os.str(); |
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83 | |
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84 | G4Exception("G4SamplingPostStepAction::DoIt()", |
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85 | "InvalidCondition", FatalException, m); |
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86 | } |
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87 | } |
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88 | |
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89 | void G4SamplingPostStepAction::Split(const G4Track &aTrack, |
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90 | const G4Nsplit_Weight &nw, |
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91 | G4ParticleChange *aParticleChange) |
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92 | { |
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93 | aParticleChange->ProposeWeight(nw.fW); |
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94 | aParticleChange->SetNumberOfSecondaries(nw.fN-1); |
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95 | |
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96 | for (G4int i=1;i<nw.fN;i++) |
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97 | { |
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98 | G4Track *ptrack = new G4Track(aTrack); |
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99 | |
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100 | // ptrack->SetCreatorProcess(aTrack.GetCreatorProcess()); |
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101 | ptrack->SetWeight(nw.fW); |
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102 | |
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103 | if (ptrack->GetMomentumDirection() != aTrack.GetMomentumDirection()) |
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104 | { |
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105 | G4Exception("G4SamplingPostStepAction::Split()", "InvalidCondition", |
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106 | FatalException, "Track with same momentum !"); |
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107 | } |
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108 | aParticleChange->AddSecondary(ptrack); |
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109 | } |
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110 | return; |
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111 | } |
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