itkVectorCentralDifferenceImageFunction.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 __itkVectorCentralDifferenceImageFunction_h
#define __itkVectorCentralDifferenceImageFunction_h

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

namespace itk
{

template<
  typename TInputImage,
  typename TCoordRep = float >
class VectorCentralDifferenceImageFunction:
  public ImageFunction< TInputImage,
                        Matrix< double,
                                TInputImage::PixelType::Dimension,
                                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.hxx"
#endif

#endif