itkInterpolateImageFunction.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 __itkInterpolateImageFunction_h
#define __itkInterpolateImageFunction_h

#include "itkImageFunction.h"

namespace itk
{
template< typename TInputImage, typename TCoordRep = double >
class InterpolateImageFunction:
  public ImageFunction< TInputImage,
                        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::IndexValueType IndexValueType;

  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