itkVectorCentralDifferenceImageFunction.h

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

  Program:   Insight Segmentation & Registration Toolkit
  Module:    $RCSfile: itkVectorCentralDifferenceImageFunction.h,v $
  Language:  C++
  Date:      $Date: 2009-04-23 03:43:42 $
  Version:   $Revision: 1.3 $

  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 __itkVectorCentralDifferenceImageFunction_h
#define __itkVectorCentralDifferenceImageFunction_h

#include "itkImageFunction.h"
#include "itkMatrix.h"
#include "itkImageBase.h"

namespace itk
{

#ifndef __itkVectorInterpolateImageFunction_h

template <typename T>
struct GetDimension
{
  itkStaticConstMacro(Dimension, int, T::Dimension);
};
#endif

   
template <
  class TInputImage, 
  class TCoordRep = float >
class ITK_EXPORT VectorCentralDifferenceImageFunction :
  public ImageFunction< TInputImage, 
                        Matrix<double, \
                        ::itk::GetDimension<typename TInputImage::PixelType>::Dimension, \
                        ::itk::GetImageDimension<TInputImage>::ImageDimension>,
                        TCoordRep >
{
public:
  typedef typename TInputImage::PixelType InputPixelType;

  itkStaticConstMacro(Dimension, unsigned int,
                      InputPixelType::Dimension);

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

  typedef VectorCentralDifferenceImageFunction Self;
  typedef ImageFunction<TInputImage,
                        Matrix<double,itkGetStaticConstMacro(Dimension),
                               itkGetStaticConstMacro(ImageDimension)>,
                        TCoordRep>       Superclass;
  typedef SmartPointer<Self>             Pointer;
  typedef SmartPointer<const Self>       ConstPointer;

  itkTypeMacro(VectorCentralDifferenceImageFunction, 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;

  virtual OutputType EvaluateAtIndex( const IndexType& index ) const;

   virtual OutputType Evaluate( const PointType& point ) const
    { 
    IndexType index;
    this->ConvertPointToNearestIndex( point, index );
    return this->EvaluateAtIndex( index ); 
    }
  virtual OutputType EvaluateAtContinuousIndex( 
    const ContinuousIndexType& cindex ) const
    { 
    IndexType index;
    this->ConvertContinuousIndexToNearestIndex( cindex, index );
    return this->EvaluateAtIndex( index ); 
    }

  itkSetMacro( UseImageDirection, bool );
  itkGetConstMacro( UseImageDirection, bool );
  itkBooleanMacro( UseImageDirection );

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

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

  // flag to take or not the image direction into account
  // when computing the derivatives.
  bool m_UseImageDirection;

};

} // end namespace itk

#ifndef ITK_MANUAL_INSTANTIATION
#include "itkVectorCentralDifferenceImageFunction.txx"
#endif

#endif

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