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//
// G4Physics2DVector inline implementation
//
// Author: Vladimir Ivanchenko, 25.09.2011
// --------------------------------------------------------------------

inline G4double G4Physics2DVector::Value(G4double x, G4double y) const
{
  std::size_t idx = 0;
  std::size_t idy = 0;
  return Value(x, y, idx, idy);
}

inline void G4Physics2DVector::PutX(std::size_t idx, G4double val)
{
  xVector[idx] = val;
}

inline void G4Physics2DVector::PutY(std::size_t idy, G4double val)
{
  yVector[idy] = val;
}

inline void G4Physics2DVector::PutValue(std::size_t idx, std::size_t idy,
                                        G4double val)
{
  (*(value[idy]))[idx] = val;
}

inline G4double G4Physics2DVector::GetX(std::size_t index) const
{
  return xVector[index];
}

inline G4double G4Physics2DVector::GetY(std::size_t index) const
{
  return yVector[index];
}

inline G4double G4Physics2DVector::GetValue(std::size_t idx,
                                            std::size_t idy) const
{
  return (*(value[idy]))[idx];
}

inline G4double G4Physics2DVector::FindLinearX(G4double rand, G4double y) const
{
  std::size_t idy = 0;
  return FindLinearX(rand, y, idy);
}

inline std::size_t G4Physics2DVector::GetLengthX() const
{
  return numberOfXNodes;
}

inline std::size_t G4Physics2DVector::GetLengthY() const
{
  return numberOfYNodes;
}

inline G4PhysicsVectorType G4Physics2DVector::GetType() const { return type; }

inline void G4Physics2DVector::SetBicubicInterpolation(G4bool val)
{
  useBicubic = val;
}

inline std::size_t G4Physics2DVector::FindBin(const G4double z,
                                              const G4PV2DDataVector& v,
                                              const std::size_t idx,
                                              const std::size_t idxmax) const
{
  std::size_t id = idx;
  if(z <= v[1])
  {
    id = 0;
  }
  else if(z >= v[idxmax])
  {
    id = idxmax;
  }
  else if(idx > idxmax || z < v[idx] || z > v[idx + 1])
  {
    id = std::lower_bound(v.begin(), v.end(), z) - v.begin() - 1;
  }
  return id;
}

inline std::size_t G4Physics2DVector::FindBinLocationX(
  const G4double x, const std::size_t idx) const
{
  return FindBin(x, xVector, idx, numberOfXNodes - 2);
}

inline std::size_t G4Physics2DVector::FindBinLocationY(
  const G4double y, const std::size_t idy) const
{
  return FindBin(y, yVector, idy, numberOfYNodes - 2);
}

inline void G4Physics2DVector::SetVerboseLevel(G4int val)
{
  verboseLevel = val;
}

inline G4double G4Physics2DVector::DerivativeX(std::size_t idx, std::size_t idy,
                                               G4double fac) const
{
  std::size_t i1 = idx;
  if(i1 > 0)
  {
    --i1;
  }
  std::size_t i2 = idx;
  if(i2 + 1 < numberOfXNodes)
  {
    ++i2;
  }
  return fac * (GetValue(i2, idy) - GetValue(i1, idy)) / (GetX(i2) - GetX(i1));
}

inline G4double G4Physics2DVector::DerivativeY(std::size_t idx, std::size_t idy,
                                               G4double fac) const
{
  std::size_t i1 = idy;
  if(i1 > 0)
  {
    --i1;
  }
  std::size_t i2 = idy;
  if(i2 + 1 < numberOfYNodes)
  {
    ++i2;
  }
  return fac * (GetValue(idx, i2) - GetValue(idx, i1)) / (GetY(i2) - GetY(i1));
}

inline G4double G4Physics2DVector::DerivativeXY(std::size_t idx,
                                                std::size_t idy,
                                                G4double fac) const
{
  std::size_t i1 = idx;
  if(i1 > 0)
  {
    --i1;
  }
  std::size_t i2 = idx;
  if(i2 + 1 < numberOfXNodes)
  {
    ++i2;
  }
  std::size_t j1 = idy;
  if(j1 > 0)
  {
    --j1;
  }
  std::size_t j2 = idy;
  if(j2 + 1 < numberOfYNodes)
  {
    ++j2;
  }
  return fac *
         (GetValue(i2, j2) - GetValue(i1, j2) - GetValue(i2, j1) +
          GetValue(i1, j1)) /
         ((GetX(i2) - GetX(i1)) * (GetY(j2) - GetY(j1)));
}