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//
// Implementation of inline methods of G4Para
// --------------------------------------------------------------------

inline
G4double G4Para::GetZHalfLength() const
{
  return fDz;
}

inline
G4ThreeVector G4Para::GetSymAxis() const
{
  return G4ThreeVector(fTthetaCphi,fTthetaSphi,1.).unit();
}

inline
G4double G4Para::GetYHalfLength() const
{
  return fDy;
}

inline
G4double G4Para::GetXHalfLength() const
{
  return fDx;
}

inline
G4double G4Para::GetTanAlpha() const
{
  return fTalpha;
}
    
inline
void G4Para::SetXHalfLength(G4double val)
{
  fDx = val;

  fCubicVolume = 0.;
  fSurfaceArea = 0.;
  fRebuildPolyhedron = true;

  CheckParameters();
  MakePlanes();
}

inline
void G4Para::SetYHalfLength(G4double val)
{
  fDy = val;

  fCubicVolume = 0.;
  fSurfaceArea = 0.;
  fRebuildPolyhedron = true;

  CheckParameters();
  MakePlanes();
}

inline
void G4Para::SetZHalfLength(G4double val)
{
  fDz = val;

  fCubicVolume = 0.;
  fSurfaceArea = 0.;
  fRebuildPolyhedron = true;

  CheckParameters();
  MakePlanes();
}

inline
void G4Para::SetAlpha(G4double alpha)
{
  fTalpha = std::tan(alpha);

  fSurfaceArea = 0.;
  fCubicVolume = 0.;
  fRebuildPolyhedron = true;

  MakePlanes();
}

inline
void G4Para::SetTanAlpha(G4double val)
{
  fTalpha = val;

  fCubicVolume = 0.;
  fSurfaceArea = 0.;
  fRebuildPolyhedron = true;

  MakePlanes();
}

inline
void G4Para::SetThetaAndPhi(G4double pTheta, G4double pPhi)
{
  G4double tanTheta = std::tan(pTheta);
  fTthetaCphi = tanTheta*std::cos(pPhi);
  fTthetaSphi = tanTheta*std::sin(pPhi);

  fCubicVolume = 0.;
  fSurfaceArea = 0.;
  fRebuildPolyhedron = true;

  MakePlanes();
}

inline G4double G4Para::GetPhi() const       
{
   return std::atan2(fTthetaSphi,fTthetaCphi);
}

inline G4double G4Para::GetTheta() const
{
   return std::atan(std::sqrt(fTthetaCphi*fTthetaCphi
                              +fTthetaSphi*fTthetaSphi));
}

inline G4double G4Para::GetAlpha() const
{
  return std::atan(fTalpha);
}