include/Geant4/G4EmElementSelector.hh

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0025 //
0026 //
0027 // -------------------------------------------------------------------
0028 //
0029 // GEANT4 Class header file
0030 //
0031 //
0032 // File name:     G4EmElementSelector
0033 //
0034 // Author:        Vladimir Ivanchenko
0035 //
0036 // Creation date: 29.05.2008
0037 //
0038 // Modifications:
0039 //
0040 //
0041 // Class Description:
0042 //
0043 // Generic helper class for the random selection of an element
0044
0045 // -------------------------------------------------------------------
0046 //
0047
0048 #ifndef G4EmElementSelector_h
0049 #define G4EmElementSelector_h 1
0050
0051 #include "globals.hh"
0052 #include "G4ParticleDefinition.hh"
0053 #include "G4Material.hh"
0054 #include "G4Element.hh"
0055 #include "G4ElementVector.hh"
0056 #include "G4PhysicsLogVector.hh"
0057 #include "Randomize.hh"
0058 #include <vector>
0059
0060 class G4VEmModel;
0061
0062 class G4EmElementSelector
0063 {
0064
0065 public:
0066
0067   G4EmElementSelector(G4VEmModel*, const G4Material*, G4int bins,
0068                       G4double emin, G4double emax,
0069                       G4bool spline = true);
0070
0071   ~G4EmElementSelector();
0072
0073   void Initialise(const G4ParticleDefinition*, G4double cut = 0.0);
0074
0075   void Dump(const G4ParticleDefinition* p = nullptr);
0076
0077   const G4Element* SelectRandomAtom(const G4double kineticEnergy,
0078                                     const G4double logEKin) const;
0079
0080   inline const G4Element* SelectRandomAtom(G4double kineticEnergy) const;
0081
0082   inline const G4Material* GetMaterial() const;
0083
0084   //  hide assignment operator
0085   G4EmElementSelector & operator=(const  G4EmElementSelector &right) = delete;
0086   G4EmElementSelector(const  G4EmElementSelector&) = delete;
0087
0088 private:
0089
0090   G4VEmModel*       model;
0091   const G4Material* material;
0092   const G4ElementVector* theElementVector;
0093
0094   G4int    nElmMinusOne;
0095   G4int    nbins;
0096
0097   G4double cutEnergy;
0098   G4double lowEnergy;
0099   G4double highEnergy;
0100
0101   std::vector<G4PhysicsLogVector*> xSections;
0102
0103 };
0104
0105 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.....
0106 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.....
0107
0108 inline const G4Element* G4EmElementSelector::SelectRandomAtom(G4double e) const
0109 {
0110   const G4Element* element = (*theElementVector)[nElmMinusOne];
0111   if (nElmMinusOne > 0) {
0112     G4double x = G4UniformRand();
0113     size_t idx(0);
0114     for(G4int i=0; i<nElmMinusOne; ++i) {
0115       if (x <= (xSections[i])->Value(e, idx)) {
0116         element = (*theElementVector)[i];
0117         break;
0118       }
0119     }
0120   }
0121   return element;
0122 }
0123
0124 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.....
0125
0126 inline const G4Material* G4EmElementSelector::GetMaterial() const
0127 {
0128   return material;
0129 }
0130
0131 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.....
0132
0133 #endif
0134