itkPhysicalCentralDifferenceImageFunction.h

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/*=========================================================================

  Program:   Insight Segmentation & Registration Toolkit
  Module:    $RCSfile: itkPhysicalCentralDifferenceImageFunction.h,v $
  Language:  C++
  Date:      $Date$
  Version:   $Revision$

  Copyright (c) Insight Software Consortium. All rights reserved.
  See ITKCopyright.txt or http://www.itk.org/HTML/Copyright.htm for details.

     This software is distributed WITHOUT ANY WARRANTY; without even
     the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
     PURPOSE.  See the above copyright notices for more information.

=========================================================================*/
#ifndef itkPhysicalCentralDifferenceImageFunction_h
#define itkPhysicalCentralDifferenceImageFunction_h

#include "itkImageFunction.h"
#include "itkCovariantVector.h"
#include "itkImageBase.h"
#include "itkLinearInterpolateImageFunction.h"

namespace itk
{

template <
  class TInputImage,
  class TCoordRep = float >
class ITK_EXPORT PhysicalCentralDifferenceImageFunction :
  public ImageFunction< TInputImage,
                        CovariantVector<double, TInputImage::ImageDimension>,
                        TCoordRep >
{
public:

  itkStaticConstMacro(ImageDimension, unsigned int,
                      TInputImage::ImageDimension);

  typedef PhysicalCentralDifferenceImageFunction Self;
  typedef ImageFunction<TInputImage,
                        CovariantVector<double,
                        itkGetStaticConstMacro(ImageDimension)>,
                        TCoordRep>       Superclass;
  typedef SmartPointer<Self>             Pointer;
  typedef SmartPointer<const Self>       ConstPointer;

  itkTypeMacro(PhysicalCentralDifferenceImageFunction, ImageFunction);

  itkNewMacro(Self);

  typedef TInputImage InputImageType;

  typedef typename Superclass::OutputType OutputType;

  typedef typename Superclass::IndexType IndexType;

  typedef typename Superclass::ContinuousIndexType ContinuousIndexType;

  typedef typename Superclass::PointType PointType;

  typedef LinearInterpolateImageFunction<TInputImage, TCoordRep>
     InterpolateImageFunctionType;

  virtual void SetInputImage( const InputImageType * ptr )
    {
        this->Superclass::SetInputImage( ptr );
        if ( m_Interpolator.IsNotNull() )
          {
          m_Interpolator->SetInputImage( ptr );
          }
    }

  virtual OutputType EvaluateAtIndex( const IndexType& index ) const
    {
    PointType point;
    m_Interpolator->GetInputImage()->TransformIndexToPhysicalPoint( index, point );
    return this->Evaluate( point );
    }

  virtual OutputType EvaluateAtContinuousIndex(
    const ContinuousIndexType& cindex ) const
    {
    PointType point;
    m_Interpolator->GetInputImage()->TransformContinuousIndexToPhysicalPoint( cindex, point );
    return this->Evaluate( point );
    }

   virtual OutputType Evaluate( const PointType& point ) const;

protected:
  PhysicalCentralDifferenceImageFunction();
  ~PhysicalCentralDifferenceImageFunction(){};
  void PrintSelf(std::ostream& os, Indent indent) const;

private:
  PhysicalCentralDifferenceImageFunction( const Self& ); //purposely not implemented
  void operator=( const Self& ); //purposely not implemented

  typename InterpolateImageFunctionType::Pointer m_Interpolator;

};

} // end namespace itk

#ifndef ITK_MANUAL_INSTANTIATION
# include "itkPhysicalCentralDifferenceImageFunction.hxx"
#endif

#endif