G4PhysicsLogVector.cc

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// $Id$
//
// 
// --------------------------------------------------------------
//      GEANT 4 class implementation file
//
//  G4PhysicsLogVector.cc
//
//  History:
//    02 Dec. 1995, G.Cosmo : Structure created based on object model
//    15 Feb. 1996, K.Amako : Implemented the 1st version
//    01 Jul. 1996, K.Amako : Hidden bin from the user introduced
//    26 Sep. 1996, K.Amako : Constructor with only 'bin size' added
//    11 Nov. 2000, H.Kurashige : use STL vector for dataVector and binVector
//    9  Mar. 2001, H.Kurashige : added PhysicsVector type and Retrieve
//    05 Sep. 2008, V.Ivanchenko : added protections for zero-length vector
//    19 Jun. 2009, V.Ivanchenko : removed hidden bin 
//
// --------------------------------------------------------------
 
#include "G4PhysicsLogVector.hh"
 
G4PhysicsLogVector::G4PhysicsLogVector()
  : G4PhysicsVector()
{ 
  type = T_G4PhysicsLogVector;
}
 
G4PhysicsLogVector::G4PhysicsLogVector(size_t theNbin)
  : G4PhysicsVector()
{
  type = T_G4PhysicsLogVector;
 
  numberOfNodes = theNbin + 1;
  dataVector.reserve(numberOfNodes);
  binVector.reserve(numberOfNodes);      
 
  for (size_t i=0; i<numberOfNodes; i++)
  {
     binVector.push_back(0.0);
     dataVector.push_back(0.0);
  }
}  
 
G4PhysicsLogVector::G4PhysicsLogVector(G4double theEmin, 
                                       G4double theEmax, size_t theNbin)
  : G4PhysicsVector()
{
  type = T_G4PhysicsLogVector;
 
  dBin     =  std::log10(theEmax/theEmin)/theNbin;
  baseBin  =  std::log10(theEmin)/dBin;
 
  numberOfNodes = theNbin + 1;
  dataVector.reserve(numberOfNodes);
  binVector.reserve(numberOfNodes);
  static const G4double g4log10 = std::log(10.); 
 
  binVector.push_back(theEmin);
  dataVector.push_back(0.0);
 
  for (size_t i=1; i<numberOfNodes-1; i++)
    {
      binVector.push_back(std::exp(g4log10*(baseBin+i)*dBin));
      dataVector.push_back(0.0);
    }
  binVector.push_back(theEmax);
  dataVector.push_back(0.0);
 
  edgeMin = binVector[0];
  edgeMax = binVector[numberOfNodes-1];
}  
 
G4PhysicsLogVector::~G4PhysicsLogVector()
{
}
 
G4bool G4PhysicsLogVector::Retrieve(std::ifstream& fIn, G4bool ascii)
{
  G4bool success = G4PhysicsVector::Retrieve(fIn, ascii);
  if (success)
  {
    G4double theEmin = binVector[0];
    dBin = std::log10(binVector[1]/theEmin);
    baseBin = std::log10(theEmin)/dBin;
  }
  return success;
}
 
void G4PhysicsLogVector::ScaleVector(G4double factorE, G4double factorV)
{
  G4PhysicsVector::ScaleVector(factorE, factorV);
  G4double theEmin = binVector[0];
  dBin = std::log10(binVector[1]/theEmin);
  baseBin = std::log10(theEmin)/dBin;
}
 
size_t G4PhysicsLogVector::FindBinLocation(G4double theEnergy) const
{
  // For G4PhysicsLogVector, FindBinLocation is implemented using
  // a simple arithmetic calculation.
  //
  // Because this is a virtual function, it is accessed through a
  // pointer to the G4PhyiscsVector object for most usages. In this
  // case, 'inline' will not be invoked. However, there is a possibility 
  // that the user access to the G4PhysicsLogVector object directly and 
  // not through pointers or references. In this case, the 'inline' will
  // be invoked. (See R.B.Murray, "C++ Strategies and Tactics", Chap.6.6)
  //G4cout << "G4PhysicsLogVector::FindBinLocation: e= " << theEnergy
 
  return size_t( std::log10(theEnergy)/dBin - baseBin );
}