itkNearestNeighborInterpolateImageFunction.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 __itkNearestNeighborInterpolateImageFunction_h
#define __itkNearestNeighborInterpolateImageFunction_h

#include "itkInterpolateImageFunction.h"

namespace itk
{
template< typename TInputImage, typename TCoordRep = double >
class NearestNeighborInterpolateImageFunction:
  public InterpolateImageFunction< TInputImage, TCoordRep >
{
public:
  typedef NearestNeighborInterpolateImageFunction            Self;
  typedef InterpolateImageFunction< TInputImage, TCoordRep > Superclass;
  typedef SmartPointer< Self >                               Pointer;
  typedef SmartPointer< const Self >                         ConstPointer;

  itkTypeMacro(NearestNeighborInterpolateImageFunction,
               InterpolateImageFunction);

  itkNewMacro(Self);

  typedef typename Superclass::OutputType OutputType;

  typedef typename Superclass::InputImageType InputImageType;

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

  typedef typename Superclass::IndexType IndexType;

  typedef typename Superclass::ContinuousIndexType ContinuousIndexType;

  virtual OutputType EvaluateAtContinuousIndex(
    const ContinuousIndexType & index) const
  {
    IndexType nindex;

    this->ConvertContinuousIndexToNearestIndex(index, nindex);
    return static_cast< OutputType >( this->GetInputImage()->GetPixel(nindex) );
  }

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

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

  // implemented
};
} // end namespace itk

#endif