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//
//
//
// Author:  Luciano Pandola (Luciano.Pandola@cern.ch)
//
// History:
// -----------
// 17 Feb 2003   LP        Created
// 17 Dec 2003   LP        Bug fixed (removed memory leak)
//
// -------------------------------------------------------------------
// Class description:
// Cubic spline interpolation and momentum calculation of given order
// obtained by linear interpolation 
// -------------------------------------------------------------------

#ifndef G4PENELOPEINTERPOLATOR_HH
#define G4PENELOPEINTERPOLATOR_HH 1

#include "globals.hh"

class G4DataVector;
class G4PenelopeInterpolator
{
public:

  G4PenelopeInterpolator(G4double* pX, G4double* pY, G4int nbOfData, G4double S1=0, G4double SN=0);

  ~G4PenelopeInterpolator();
 
  G4double CubicSplineInterpolation(G4double xx);
  G4double FirstDerivative(G4double xx);
  G4double CalculateMomentum(G4double UpperLimit,G4int MomentumOrder);
  
private:
  G4int FindBin(G4double xx);
  //coefficients
  G4DataVector* a;
  G4DataVector* b;
  G4DataVector* c;
  G4DataVector* d;
  //stored data
  G4DataVector* x;
  G4DataVector* y;
};
 
#endif