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// $Id: G4LinInterpolation.cc,v 1.3 2006/06/29 19:40:03 gunter Exp $
// GEANT4 tag $Name: geant4-09-02 $
//
// Author: Maria Grazia Pia (Maria.Grazia.Pia@cern.ch)
//
// History:
// -----------
// 31 Jul 2001   MGP        Created
//
// -------------------------------------------------------------------

#include "G4LinInterpolation.hh"

// Constructor

G4LinInterpolation::G4LinInterpolation()
{ }

// Destructor

G4LinInterpolation::~G4LinInterpolation()
{ }


G4VDataSetAlgorithm* G4LinInterpolation::Clone() const 
{ return new G4LinInterpolation; }

G4double G4LinInterpolation::Calculate(G4double x, G4int bin, 
				       const G4DataVector& points, 
				       const G4DataVector& data) const
{
  G4int nBins = data.size() - 1;
  G4double value = 0.;
  if (x < points[0])
    {
      value = 0.;
    }
  else if (bin < nBins)
    {
      G4double e1 = points[bin];
      G4double e2 = points[bin+1];
      G4double d1 = data[bin];
      G4double d2 = data[bin+1];
      value = d1 + (d2 - d1)*(x - e1)/(e2 - e1);
    }
  else
    {
      value = data[nBins];
    }
  return value;
}
