itkVectorInterpolateImageFunction.h

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

  Program:   Insight Segmentation & Registration Toolkit
  Module:    $RCSfile: itkVectorInterpolateImageFunction.h,v $
  Language:  C++
  Date:      $Date: 2008-05-14 09:26:05 $
  Version:   $Revision: 1.23 $

  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 __itkVectorInterpolateImageFunction_h
#define __itkVectorInterpolateImageFunction_h

#include "itkImageFunction.h"
#include "itkFixedArray.h"

namespace itk
{

template <typename T>
struct GetDimension
{
  itkStaticConstMacro(Dimension, int, T::Dimension);
}; 

  
template <class TInputImage, class TCoordRep = double>
class ITK_EXPORT VectorInterpolateImageFunction :
  public ImageFunction<
    TInputImage,
    ITK_TYPENAME NumericTraits<typename TInputImage::PixelType>::RealType,
    TCoordRep >
{
public:
  itkStaticConstMacro(Dimension, unsigned int,
                      TInputImage::PixelType::Dimension);

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

  typedef VectorInterpolateImageFunction Self;
  typedef ImageFunction<TInputImage,
    ITK_TYPENAME NumericTraits<typename TInputImage::PixelType>::RealType,
    TCoordRep > Superclass;
  typedef SmartPointer<Self> Pointer;
  typedef SmartPointer<const Self>  ConstPointer;

  itkTypeMacro(VectorInterpolateImageFunction, ImageFunction);

  typedef typename Superclass::InputImageType InputImageType;
  typedef typename InputImageType::PixelType  PixelType;
  typedef typename PixelType::ValueType       ValueType;
  typedef typename NumericTraits<ValueType>::RealType  RealType;

  typedef typename Superclass::PointType PointType;

  typedef typename Superclass::IndexType IndexType;

  typedef typename Superclass::ContinuousIndexType ContinuousIndexType;

  typedef typename Superclass::OutputType OutputType;

  typedef TCoordRep CoordRepType;

  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
    {
    OutputType output;
    PixelType input = this->GetInputImage()->GetPixel( index );
    for( unsigned int k = 0; k < Dimension; k++ )
      {
      output[k] = static_cast<double>( input[k] );
      }
    return ( output );
    }

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

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

};

} // end namespace itk

#endif