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:
  ITK_DISALLOW_COPY_AND_ASSIGN(PhysicalCentralDifferenceImageFunction);

  static constexpr unsigned int ImageDimension = TInputImage::ImageDimension;

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

  itkTypeMacro(PhysicalCentralDifferenceImageFunction, ImageFunction);

  itkNewMacro(Self);

  using InputImageType = TInputImage;

  using OutputType = typename Superclass::OutputType;

  using IndexType = typename Superclass::IndexType;

  using ContinuousIndexType = typename Superclass::ContinuousIndexType;

  using PointType = typename Superclass::PointType;

  using InterpolateImageFunctionType = LinearInterpolateImageFunction<TInputImage, TCoordRep>;

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

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

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

   OutputType Evaluate( const PointType& point ) const override;

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

private:
  typename InterpolateImageFunctionType::Pointer m_Interpolator;

};

} // end namespace itk

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

#endif