#ifndef __FPA__IMAGE__FUNCTORS__GRADIENTIMAGEFUNCTIONBASE__HXX__
#define __FPA__IMAGE__FUNCTORS__GRADIENTIMAGEFUNCTIONBASE__HXX__

// -------------------------------------------------------------------------
template< class _TGradient >
void fpa::Image::Functors::GradientImageFunctionBase< _TGradient >::
Prepare( ) const
{
}

// -------------------------------------------------------------------------
template< class _TGradient >
typename fpa::Image::Functors::GradientImageFunctionBase< _TGradient >::
TOutput fpa::Image::Functors::GradientImageFunctionBase< _TGradient >::
Evaluate( const TPoint& p ) const
{
  TIndex i;
  this->GetInputImage( )->TransformPhysicalPointToIndex( p, i );
  return( this->EvaluateAtIndex( i ) );
}

// -------------------------------------------------------------------------
template< class _TGradient >
typename fpa::Image::Functors::GradientImageFunctionBase< _TGradient >::
TOutput fpa::Image::Functors::GradientImageFunctionBase< _TGradient >::
EvaluateAtIndex( const TIndex& i ) const
{
  return( this->_Evaluate( i ) );
}

// -------------------------------------------------------------------------
template< class _TGradient >
typename fpa::Image::Functors::GradientImageFunctionBase< _TGradient >::
TOutput fpa::Image::Functors::GradientImageFunctionBase< _TGradient >::
EvaluateAtContinuousIndex( const TContIndex& i ) const
{
  TPoint p;
  this->GetInputImage( )->TransformContinuousIndexToPhysicalPoint( i, p );
  return( this->Evaluate( p ) );
}

// -------------------------------------------------------------------------
template< class _TGradient >
fpa::Image::Functors::GradientImageFunctionBase< _TGradient >::
GradientImageFunctionBase( )
  : Superclass( )
{
}

// -------------------------------------------------------------------------
template< class _TGradient >
fpa::Image::Functors::GradientImageFunctionBase< _TGradient >::
~GradientImageFunctionBase( )
{
}

#endif // __FPA__IMAGE__FUNCTORS__GRADIENTIMAGEFUNCTIONBASE__HXX__

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