itkNearestNeighborInterpolateImageFunction.h

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

  Program:   Insight Segmentation & Registration Toolkit
  Module:    $RCSfile: itkNearestNeighborInterpolateImageFunction.h,v $
  Language:  C++
  Date:      $Date: 2008-05-13 15:32:37 $
  Version:   $Revision: 1.13 $

  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 __itkNearestNeighborInterpolateImageFunction_h
#define __itkNearestNeighborInterpolateImageFunction_h

#include "itkInterpolateImageFunction.h"

namespace itk
{

template <class TInputImage, class TCoordRep = double>
class ITK_EXPORT 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

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