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 ITK_TEMPLATE_EXPORT InterpolateImageFunction:
  public ImageFunction< TInputImage,
                        typename NumericTraits< typename TInputImage::PixelType >::RealType, TCoordRep >
{
public:
  ITK_DISALLOW_COPY_AND_ASSIGN(InterpolateImageFunction);

  using Self = InterpolateImageFunction;
  using Superclass = ImageFunction< TInputImage,
                         typename NumericTraits< typename TInputImage::PixelType >::RealType,
                         TCoordRep >;

  using Pointer = SmartPointer< Self >;
  using ConstPointer = SmartPointer< const Self >;

  itkTypeMacro(InterpolateImageFunction, ImageFunction);

  using OutputType = typename Superclass::OutputType;

  using InputImageType = typename Superclass::InputImageType;

  static constexpr unsigned int ImageDimension = Superclass::ImageDimension;

  using PointType = typename Superclass::PointType;

  using IndexType = typename Superclass::IndexType;
  using IndexValueType = typename Superclass::IndexValueType;

  using ContinuousIndexType = typename Superclass::ContinuousIndexType;

  using RealType = typename NumericTraits< typename TInputImage::PixelType >::RealType;

  OutputType Evaluate(const PointType & point) const override
  {
    ContinuousIndexType index;

    this->GetInputImage()->TransformPhysicalPointToContinuousIndex(point, index);
    return ( this->EvaluateAtContinuousIndex(index) );
  }

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

  OutputType EvaluateAtIndex(const IndexType & index) const override
  {
    return ( static_cast< RealType >( this->GetInputImage()->GetPixel(index) ) );
  }

protected:
  InterpolateImageFunction()= default;
  ~InterpolateImageFunction() override = default;
  void PrintSelf(std::ostream & os, Indent indent) const override
  { Superclass::PrintSelf(os, indent); }
};
} // end namespace itk

#endif