itkCentralDifferenceImageFunction.h

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/*=========================================================================
 *
 *  Copyright Insight Software Consortium
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *         http://www.apache.org/licenses/LICENSE-2.0.txt
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 *
 *=========================================================================*/
#ifndef __itkCentralDifferenceImageFunction_h
#define __itkCentralDifferenceImageFunction_h

#include "itkImageFunction.h"
#include "itkCovariantVector.h"
#include "itkInterpolateImageFunction.h"

namespace itk
{
template<
  class TInputImage,
  class TCoordRep = float >
class ITK_EXPORT CentralDifferenceImageFunction:
  public ImageFunction< TInputImage,
                        CovariantVector< double, \
                                         TInputImage::ImageDimension >,
                        TCoordRep >
{
public:

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

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

  itkTypeMacro(CentralDifferenceImageFunction, 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 typename TInputImage::SpacingType SpacingType;

  typedef InterpolateImageFunction< TInputImage, TCoordRep > InterpolatorType;
  typedef typename InterpolatorType::Pointer                 InterpolatorPointer;

  virtual void SetInputImage(const TInputImage *inputData);

  virtual void SetInterpolator(InterpolatorType *interpolator);

  itkGetConstObjectMacro( Interpolator, InterpolatorType );

  virtual OutputType EvaluateAtIndex(const IndexType & index) const;

  virtual OutputType Evaluate(const PointType & point) const;

  virtual OutputType EvaluateAtContinuousIndex(
    const ContinuousIndexType & cindex) const;

  itkSetMacro(UseImageDirection, bool);
  itkGetConstMacro(UseImageDirection, bool);
  itkBooleanMacro(UseImageDirection);
protected:
  CentralDifferenceImageFunction();
  ~CentralDifferenceImageFunction(){}
  void PrintSelf(std::ostream & os, Indent indent) const;

private:
  CentralDifferenceImageFunction(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;

  // interpolator
  InterpolatorPointer   m_Interpolator;
};
} // end namespace itk

// Define instantiation macro for this template.
#define ITK_TEMPLATE_CentralDifferenceImageFunction(_, EXPORT, TypeX, TypeY)     \
  namespace itk                                                                  \
  {                                                                              \
  _( 2 ( class EXPORT CentralDifferenceImageFunction< ITK_TEMPLATE_2 TypeX > ) ) \
  namespace Templates                                                            \
  {                                                                              \
  typedef CentralDifferenceImageFunction< ITK_TEMPLATE_2 TypeX >                 \
  CentralDifferenceImageFunction##TypeY;                                       \
  }                                                                              \
  }

#if ITK_TEMPLATE_EXPLICIT
// HACK:  template < class TInputImage, class TCoordRep >
//    const unsigned int
// CentralDifferenceImageFunction<TInputImage,TCoordRep>::ImageDimension;
#include "Templates/itkCentralDifferenceImageFunction+-.h"
#endif

#if ITK_TEMPLATE_TXX
#include "itkCentralDifferenceImageFunction.hxx"
#endif

#endif