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25 //
26 //
27 // -------------------------------------------------------------------
28 //
29 // GEANT4 Class header file
30 //
31 //
32 // File name: G4EmElementSelector
33 //
34 // Author: Vladimir Ivanchenko
35 //
36 // Creation date: 29.05.2008
37 //
38 // Modifications:
39 //
40 //
41 // Class Description:
42 //
43 // Generic helper class for the random selection of an element
44
45 // -------------------------------------------------------------------
46 //
47
48 #ifndef G4EmElementSelector_h
49 #define G4EmElementSelector_h 1
50
51 #include "globals.hh"
52 #include "G4ParticleDefinition.hh"
53 #include "G4Material.hh"
54 #include "G4Element.hh"
55 #include "G4ElementVector.hh"
56 #include "G4PhysicsLogVector.hh"
57 #include "Randomize.hh"
58 #include <vector>
59
60 class G4VEmModel;
61
62 class G4EmElementSelector
63 {
64
65 public:
66
67 G4EmElementSelector(G4VEmModel*, const G4Material*, G4int bins,
68 G4double emin, G4double emax,
69 G4bool spline = true);
70
71 ~G4EmElementSelector();
72
73 void Initialise(const G4ParticleDefinition*, G4double cut = 0.0);
74
75 void Dump(const G4ParticleDefinition* p = nullptr);
76
77 const G4Element* SelectRandomAtom(const G4double kineticEnergy,
78 const G4double logEKin) const;
79
80 inline const G4Element* SelectRandomAtom(G4double kineticEnergy) const;
81
82 inline const G4Material* GetMaterial() const;
83
84 // hide assignment operator
85 G4EmElementSelector & operator=(const G4EmElementSelector &right) = delete;
86 G4EmElementSelector(const G4EmElementSelector&) = delete;
87
88 private:
89
90 G4VEmModel* model;
91 const G4Material* material;
92 const G4ElementVector* theElementVector;
93
94 G4int nElmMinusOne;
95 G4int nbins;
96
97 G4double cutEnergy;
98 G4double lowEnergy;
99 G4double highEnergy;
100
101 std::vector<G4PhysicsLogVector*> xSections;
102
103 };
104
105 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.....
106 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.....
107
108 inline const G4Element* G4EmElementSelector::SelectRandomAtom(G4double e) const
109 {
110 const G4Element* element = (*theElementVector)[nElmMinusOne];
111 if (nElmMinusOne > 0) {
112 G4double x = G4UniformRand();
113 size_t idx(0);
114 for(G4int i=0; i<nElmMinusOne; ++i) {
115 if (x <= (xSections[i])->Value(e, idx)) {
116 element = (*theElementVector)[i];
117 break;
118 }
119 }
120 }
121 return element;
122 }
123
124 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.....
125
126 inline const G4Material* G4EmElementSelector::GetMaterial() const
127 {
128 return material;
129 }
130
131 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.....
132
133 #endif
134
135