itkExtrapolateImageFunction.h

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

  Program:   Insight Segmentation & Registration Toolkit
  Module:    $RCSfile: itkExtrapolateImageFunction.h,v $
  Language:  C++
  Date:      $Date: 2008-10-13 15:36:31 $
  Version:   $Revision: 1.5 $

  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 __itkExtrapolateImageFunction_h
#define __itkExtrapolateImageFunction_h

#include "itkImageFunction.h"

namespace itk
{

template <class TInputImage, class TCoordRep = float>
class ITK_EXPORT ExtrapolateImageFunction : 
  public ImageFunction< TInputImage, 
    ITK_TYPENAME NumericTraits<typename TInputImage::PixelType>::RealType, TCoordRep > 
{
public:
  typedef ExtrapolateImageFunction                        Self;
  typedef ImageFunction<TInputImage,double,TCoordRep>     Superclass;
  typedef SmartPointer<Self>                              Pointer;
  typedef SmartPointer<const Self>                        ConstPointer;

  itkTypeMacro(ExtrapolateImageFunction, ImageFunction);

  typedef typename Superclass::OutputType OutputType;

  typedef typename Superclass::InputImageType InputImageType;

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

  typedef typename Superclass::PointType PointType;

  typedef typename Superclass::IndexType IndexType;

  typedef typename Superclass::ContinuousIndexType ContinuousIndexType;

  typedef typename NumericTraits<typename TInputImage::PixelType>::RealType RealType;

  virtual OutputType Evaluate( const PointType& point ) const
    {
    ContinuousIndexType index;
    this->GetInputImage()->TransformPhysicalPointToContinuousIndex( point, index );
    return ( this->EvaluateAtContinuousIndex( index ) );
    }

  virtual OutputType EvaluateAtContinuousIndex( 
    const ContinuousIndexType & index ) const = 0;

  virtual OutputType EvaluateAtIndex( 
    const IndexType & index ) const = 0;

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

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

};

} // end namespace itk

#endif