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// $Id: G4PhysicsVector.icc,v 1.30 2010/09/20 16:22:56 gcosmo Exp $
// GEANT4 tag $Name: global-V09-03-22 $
//
// 
//---------------------------------------------------------------
//      GEANT 4 class source file
//
//  G4PhysicsVector.icc
//
//  Description:
//    A physics vector which has values of energy-loss, cross-section, 
//    and other physics values of a particle in matter in a given 
//    range of the energy, momentum, etc.
//    This class serves as the base class for a vector having various 
//    energy scale, for example like 'log', 'linear', 'free', etc.
//
//---------------------------------------------------------------

inline
 G4double G4PhysicsVector::GetLastEnergy() const
{
  return cache->lastEnergy;	
}

inline
 G4double G4PhysicsVector::GetLastValue() const
{
   return cache->lastValue;
}

inline 
 size_t G4PhysicsVector::GetLastBin() const
{
   return cache->lastBin;
}
 
inline
 G4double G4PhysicsVector::operator[](const size_t binNumber) const
{
  return  dataVector[binNumber];
}

//---------------------------------------------------------------

inline
 G4double G4PhysicsVector::operator()(const size_t binNumber) const
{
  return dataVector[binNumber];
}

//---------------------------------------------------------------

inline
 G4double G4PhysicsVector::Energy(const size_t binNumber) const
{
  return binVector[binNumber];
}

//---------------------------------------------------------------

inline 
 size_t G4PhysicsVector::GetVectorLength() const
{
  return numberOfNodes;
}

//---------------------------------------------------------------

inline
 G4double G4PhysicsVector::GetValue(G4double theEnergy, G4bool&) 
{
  return Value(theEnergy);
}

//------------------------------------------------

inline
 G4double G4PhysicsVector::LinearInterpolation(G4int lastBin)
{
  // Linear interpolation is used to get the value. If the give energy
  // is in the highest bin, no interpolation will be Done. Because 
  // there is an extra bin hidden from a user at locBin=numberOfBin, 
  // the following interpolation is valid even the current locBin=
  // numberOfBin-1. 

  G4double intplFactor = (cache->lastEnergy-binVector[lastBin]) 
     / (binVector[lastBin + 1]-binVector[lastBin]); // Interpol. factor

  return dataVector[lastBin] +
         ( dataVector[lastBin + 1]-dataVector[lastBin] ) * intplFactor;
}

//---------------------------------------------------------------

inline
 G4double G4PhysicsVector::SplineInterpolation(G4int lastBin)
{
  // Spline interpolation is used to get the value. If the give energy
  // is in the highest bin, no interpolation will be Done. Because 
  // there is an extra bin hidden from a user at locBin=numberOfBin, 
  // the following interpolation is valid even the current locBin=
  // numberOfBin-1. 

  if(0 == secDerivative.size() ) { FillSecondDerivatives(); }

  // check bin value
  G4double x1 = binVector[lastBin];
  G4double x2 = binVector[lastBin + 1];
  G4double delta = x2 - x1;

  G4double a = (x2 - cache->lastEnergy)/delta;
  G4double b = (cache->lastEnergy - x1)/delta;
   
  // Final evaluation of cubic spline polynomial for return   
  G4double y1 = dataVector[lastBin];
  G4double y2 = dataVector[lastBin + 1];

  G4double res = a*y1 + b*y2 + 
        ( (a*a*a - a)*secDerivative[lastBin] +
          (b*b*b - b)*secDerivative[lastBin + 1] )*delta*delta/6.0;

  return res;
}

//---------------------------------------------------------------

inline 
 void G4PhysicsVector::Interpolation(G4int lastBin)
{
  if(useSpline) { cache->lastValue = SplineInterpolation(lastBin); }
  else          { cache->lastValue = LinearInterpolation(lastBin); }
}

//---------------------------------------------------------------

inline 
 void G4PhysicsVector::PutValue(size_t binNumber, G4double theValue)
{
  dataVector[binNumber] = theValue;
}

//---------------------------------------------------------------

inline 
 G4bool G4PhysicsVector::IsFilledVectorExist() const
{
  G4bool status=false;

  if(numberOfNodes > 0) { status=true; }
  return status;
}

//---------------------------------------------------------------

inline 
 void G4PhysicsVector::PutComment(const G4String& theComment)
{
  comment = theComment;
}

//---------------------------------------------------------------

inline 
 const G4String& G4PhysicsVector::GetComment() const
{
  return comment;
}

//---------------------------------------------------------------

inline 
 G4PhysicsVectorType G4PhysicsVector::GetType() const
{
  return type;
}

//---------------------------------------------------------------

inline 
 void G4PhysicsVector::SetSpline(G4bool val)
{
  useSpline = val;
}