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// $Id: G4FinalStateElasticChampion.hh,v 1.1 2008/07/15 19:56:50 sincerti Exp $
// GEANT4 tag $Name: geant4-09-03 $
// -------------------------------------------------------------------

#ifndef G4FINALSTATEELASTICCHAMPION_HH
#define G4FINALSTATEELASTICCHAMPION_HH 1

#include "Randomize.hh"
#include "G4Electron.hh"
#include "G4FinalStateProduct.hh"

class G4FinalStateElasticChampion
{
 public:
   
   G4FinalStateElasticChampion();
   
   ~G4FinalStateElasticChampion();
   
   const G4FinalStateProduct& GenerateFinalState(const G4Track& track, const G4Step& step);
   
 private:
   
   G4double lowEnergyLimit;
   G4double highEnergyLimit;
   
   G4FinalStateProduct product;

   G4double DifferentialCrossSection(G4ParticleDefinition * aParticleDefinition, G4double k, G4double theta);

   G4double LogLogInterpolate(G4double e1, G4double e2, G4double e, G4double xs1, G4double xs2);
   
   G4double LinLogInterpolate(G4double e1, G4double e2, G4double e, G4double xs1, G4double xs2);
   
   G4double QuadInterpolator(G4double e11, 
			     G4double e12, 
			     G4double e21, 
			     G4double e22, 
			     G4double x11,
			     G4double x12, 
			     G4double x21, 
			     G4double x22, 
			     G4double t1, 
			     G4double t2, 
			     G4double t, 
			     G4double e);

   typedef std::map<double, std::map<double, double> > TriDimensionMap;
   TriDimensionMap eDiffCrossSectionData[6];
   std::vector<double> eTdummyVec;

   typedef std::map<double, std::vector<double> > VecMap;
   VecMap eVecm;
   
   G4double RandomizeCosTheta(G4double k);
};
#endif
