itkInterpolateImageFunction.h

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

  Program:   Insight Segmentation & Registration Toolkit
  Module:    $RCSfile: itkInterpolateImageFunction.h,v $
  Language:  C++
  Date:      $Date: 2008-05-14 09:26:05 $
  Version:   $Revision: 1.21 $

  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 __itkInterpolateImageFunction_h
#define __itkInterpolateImageFunction_h

#include "itkImageFunction.h"

namespace itk
{

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

  itkTypeMacro(InterpolateImageFunction, 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
    {
    return ( static_cast<RealType>( this->GetInputImage()->GetPixel( index ) ) );
    }

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

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

};

} // end namespace itk

#endif