composite_calorimeter/include/CCalDataSet.hh

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0025 //
0026 #ifndef CCalDataSet_h
0027 #define CCalDataSet_h
0028
0029 #include "G4ParticleHPInterpolator.hh"
0030 #include <vector>
0031
0032 // by JPW, working, but to be cleaned up. @@@@
0033
0034 class CCalDataSet
0035 {
0036 public:
0037
0038   void insert(G4double anEnergy, G4double aXsection)
0039   {
0040     pair<G4double, G4double> aPoint(anEnergy, aXsection);
0041     theData.push_back(aPoint);
0042   }
0043
0044   double getCrossSection(G4double anEnergy)
0045   {
0046     G4double result;
0047     if(anEnergy < theData[0].first)
0048     {
0049       result = 0;
0050     }
0051     else
0052     {
0053       G4double x1,x2;
0054       G4double y1,y2;
0055       if(anEnergy > theData[theData.size()-1].second)
0056       {
0057         // extrapolation
0058         G4int n=theData.size();
0059         x1 = theData[n-1].first;
0060         y1 = theData[n-1].second;
0061         x2 = theData[n-2].first;
0062         y2 = theData[n-2].second;
0063       }
0064       else
0065       {
0066         // linear search and interpolation
0067         unsigned int i;
0068         for(i=0; i<theData.size(); ++i)
0069         {
0070           if(theData[i].first>anEnergy) break;
0071         }
0072         x1 = theData[i-1].first;
0073         y1 = theData[i-1].second;
0074         x2 = theData[i].first;
0075         y2 = theData[i].second;
0076       }
0077       // interpolate logarithmic in energy and linear in cross-section
0078       result = theInterpolator.Interpolate(LOGLIN, anEnergy,  x1,x2,y1,y2);
0079     }
0080     return result*barn;
0081   }
0082
0083 private:
0084
0085   G4ParticleHPInterpolator theInterpolator;
0086
0087 private:
0088
0089   vector<pair<G4double, G4double> > theData;
0090 };
0091 #endif