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// $Id: G4V3DNucleus.hh,v 1.4 2005/06/04 13:40:04 jwellisc Exp $
// GEANT4 tag $Name: geant4-08-00 $
//
#ifndef G4V3DNucleus_h
#define G4V3DNucleus_h 1

class G4Nucleon;
class G4VNuclearDensity;
#include "G4DynamicParticle.hh"
#include <utility>  
#include "Randomize.hh"
#include <vector>

class G4V3DNucleus 
{

  public:
      G4V3DNucleus();
      virtual ~G4V3DNucleus();

  private:
      G4V3DNucleus(const G4V3DNucleus &right);
      const G4V3DNucleus & operator=(const G4V3DNucleus &right);
      int operator==(const G4V3DNucleus &right) const;
      int operator!=(const G4V3DNucleus &right) const;

  public:
      virtual void Init(G4double theA, G4double theZ) = 0;
      virtual G4bool StartLoop() = 0;
      virtual G4Nucleon * GetNextNucleon() = 0;
      virtual const std::vector<G4Nucleon *> & GetNucleons() = 0;
      virtual G4int GetMassNumber() = 0;
      virtual G4double GetMass() = 0;
      virtual G4int GetCharge() = 0;
      virtual G4double GetNuclearRadius() = 0;
      virtual G4double GetNuclearRadius(const G4double maxRelativeDensity) = 0;
      virtual G4double GetOuterRadius() = 0;
      virtual G4double CoulombBarrier() = 0;
      virtual void DoLorentzBoost(const G4LorentzVector & theBoost) = 0;
      virtual void DoLorentzBoost(const G4ThreeVector & theBeta) = 0;
      virtual void DoLorentzContraction(const G4LorentzVector & theBoost) = 0;
      virtual void DoLorentzContraction(const G4ThreeVector & theBeta) = 0;
      virtual void DoTranslation(const G4ThreeVector & theShift) = 0;
      virtual const G4VNuclearDensity * GetNuclearDensity() const = 0;
  public:
      std::pair<G4double, G4double> ChooseImpactXandY(G4double maxImpact);
      std::pair<G4double, G4double> RefetchImpactXandY(){return theImpactParameter;}

  private:
  
    std::pair<G4double, G4double> theImpactParameter;

};

inline
std::pair<G4double, G4double> G4V3DNucleus::
ChooseImpactXandY(G4double maxImpact)
{
  G4double x,y;
  do
  {
    x = 2*G4UniformRand() - 1;
    y = 2*G4UniformRand() - 1;
  }
  while(x*x + y*y > 1);
  G4double impactX = x*(maxImpact); 
  G4double impactY = y*(maxImpact);
  theImpactParameter.first = impactX;
  theImpactParameter.second = impactY;
  return theImpactParameter;
}


#endif