G4PhysicsOrderedFreeVector.cc

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//
//
// PhysicsOrderedFreeVector Class Implementation
//
// File:        G4PhysicsOrderedFreeVector.cc
// Version:     2.0
// Created:     1996-08-13
// Author:      Juliet Armstrong
// Updated:     1997-03-25 by Peter Gumplinger
//              > cosmetics (only)
//              1998-11-11 by Peter Gumplinger
//              > initialize all data members of the base class in 
//                derived class constructors
//              2000-11-11 by H.Kurashige
//              > use STL vector for dataVector and binVector
//              2009-06-19 by V.Ivanchenko 
//              > removed hidden bin 
//              2013-10-02 by V.Ivanchenko removed FindBinLocation   
//
// mail:        gum@triumf.ca
//

#include "G4PhysicsOrderedFreeVector.hh"

G4PhysicsOrderedFreeVector::G4PhysicsOrderedFreeVector()
  : G4PhysicsVector()
{
        type = T_G4PhysicsOrderedFreeVector;
}

G4PhysicsOrderedFreeVector::G4PhysicsOrderedFreeVector(G4double *Energies,
                                                       G4double *Values,
                                                       size_t VectorLength)
  : G4PhysicsVector()
{
        type = T_G4PhysicsOrderedFreeVector;

        dataVector.reserve(VectorLength);
        binVector.reserve(VectorLength);

        for (size_t i = 0 ; i < VectorLength ; ++i)
        { 
          InsertValues(Energies[i], Values[i]);
        }
}

G4PhysicsOrderedFreeVector::~G4PhysicsOrderedFreeVector()
{}
  
void G4PhysicsOrderedFreeVector::InsertValues(G4double energy, G4double value)
{
        std::vector<G4double>::iterator binLoc =
                 std::lower_bound(binVector.begin(), binVector.end(), energy);

        size_t binIdx = binLoc - binVector.begin(); // Iterator difference!

        std::vector<G4double>::iterator dataLoc = dataVector.begin() + binIdx;

        binVector.insert(binLoc, energy);
        dataVector.insert(dataLoc, value);

        ++numberOfNodes;
        edgeMin = binVector.front();
        edgeMax = binVector.back();
}

G4double G4PhysicsOrderedFreeVector::GetEnergy(G4double aValue)
{
        G4double e;
        if (aValue <= GetMinValue()) {
          e = edgeMin;
        } else if (aValue >= GetMaxValue()) {
          e = edgeMax;
        } else { 
          size_t closestBin = FindValueBinLocation(aValue);
          e = LinearInterpolationOfEnergy(aValue, closestBin);
  }
        return e;
}

size_t G4PhysicsOrderedFreeVector::FindValueBinLocation(G4double aValue)
{
        size_t bin = std::lower_bound(dataVector.begin(), dataVector.end(), aValue)
                   - dataVector.begin() - 1;
        bin = std::min(bin, numberOfNodes-2);
        return bin;
}

G4double G4PhysicsOrderedFreeVector::LinearInterpolationOfEnergy(G4double aValue,
                 size_t bin)
{
        G4double res = binVector[bin];
        G4double del = dataVector[bin+1] - dataVector[bin];
        if(del > 0.0) { 
          res += (aValue - dataVector[bin])*(binVector[bin+1] - res)/del;  
        }
        return res;
}