// This code implementation is the intellectual property of
// the GEANT4 collaboration.
//
// By copying, distributing or modifying the Program (or any work
// based on the Program) you indicate your acceptance of this statement,
// and all its terms.
//
// $Id: G4BezierSurface.icc,v 1.2 2000/08/28 15:00:30 gcosmo Exp $
// GEANT4 tag $Name: geant4-03-00 $
//
// --------------------------------------------------------------------
// GEANT 4 inline definitions file
//
// G4BezierSurface.icc
//
// Implementation of inline methods of G4BezierSurface
// --------------------------------------------------------------------

inline
G4Point3D G4BezierSurface::AveragePoint() const
{
  return average_pt;
}

inline
void G4BezierSurface::SetAveragePoint(G4Point3D p)
{
  average_pt=p;
}

inline
G4double G4BezierSurface::UAverage() const
{
  return average_u;
}

inline
G4double G4BezierSurface::VAverage() const
{
  return average_v;
}

inline
void G4BezierSurface::Dir(G4int d)
{
  dir=d;
}

inline
void G4BezierSurface::ChangeDir()
{
  dir=!dir;
}

inline
G4double G4BezierSurface::SMin() const
{
  return smin;
}

inline
G4double G4BezierSurface::SMax() const
{
  return smax;
}

inline
G4int G4BezierSurface::GetOrder(G4int direction) const
{
  return order[direction];
}

inline
void G4BezierSurface::PutOrder(G4int direction, G4int value)
{
  order[direction]=value;
}

inline
G4double G4BezierSurface::GetU() const
{
  return (u_min + u_max)/2.0;
}

inline
G4double G4BezierSurface::GetV() const
{
  return (v_min + v_max)/2.0;
}

inline
void G4BezierSurface::LocalizeClipValues()
{
  if ( dir == ROW)
  {
    smin = (1.0 - smin) * u_knots->GetKnot(0) +
      smin * u_knots->GetKnot(u_knots->GetSize() - 1);
    smax = (1.0 - smax) * u_knots->GetKnot(0) +
      smax * u_knots->GetKnot(u_knots->GetSize() - 1);
  }
  else
  {
    smin = (1.0 - smin) * v_knots->GetKnot(0) +
      smin * v_knots->GetKnot(v_knots->GetSize() - 1);
    smax = (1.0 - smax) * v_knots->GetKnot(0) +
      smax * v_knots->GetKnot(v_knots->GetSize() - 1);
  }  
}

inline
G4double G4BezierSurface::Findzero(G4double x0, G4double x1,
                                   G4double y0, G4double y1) const
{
  return(x0 - y0 * ( x1 - x0) / (y1-y0));
}
  
inline
G4int G4BezierSurface::Sign(G4double a)	const
{
  return ((a < 0.0)? -1 : 1);
}

inline
G4int G4BezierSurface::Amax(G4int i, G4int j) const
{
  return( (i) > (j) ? (i) : (j) );
}

inline
G4int G4BezierSurface::Amin(G4int i, G4int j) const
{
  return( (i) < (j) ? (i) : (j) );
}
	
inline
G4int G4BezierSurface::AhIndex(G4int j, G4int t, G4int iorder) const
{
  return(( (j) * ((j)+1)/2) + (t) - ((iorder-1) - (j)));
}