itkExtrapolateImageFunction.h

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/*=========================================================================
 *
 *  Copyright NumFOCUS
 *
 *  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
 *
 *         https://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 itkExtrapolateImageFunction_h
#define itkExtrapolateImageFunction_h
 
#include "itkImageFunction.h"
 
namespace itk
{
template <typename TInputImage, typename TCoordinate = float>
class ExtrapolateImageFunction
  : public ImageFunction<TInputImage, typename NumericTraits<typename TInputImage::PixelType>::RealType, TCoordinate>
{
public:
  ITK_DISALLOW_COPY_AND_MOVE(ExtrapolateImageFunction);

  using Self = ExtrapolateImageFunction;
  using Superclass =
    ImageFunction<TInputImage, typename NumericTraits<typename TInputImage::PixelType>::RealType, TCoordinate>;
  using Pointer = SmartPointer<Self>;
  using ConstPointer = SmartPointer<const Self>;

  itkOverrideGetNameOfClassMacro(ExtrapolateImageFunction);

  using typename Superclass::OutputType;

  using typename Superclass::InputImageType;

  static constexpr unsigned int ImageDimension = Superclass::ImageDimension;

  using typename Superclass::PointType;

  using typename Superclass::IndexType;

  using typename Superclass::ContinuousIndexType;

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

  OutputType
  Evaluate(const PointType & point) const override
  {
    const ContinuousIndexType index =
      this->GetInputImage()->template TransformPhysicalPointToContinuousIndex<TCoordinate>(point);
    return (this->EvaluateAtContinuousIndex(index));
  }

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

  OutputType
  EvaluateAtIndex(const IndexType & index) const override = 0;
 
protected:
  ExtrapolateImageFunction() = default;
  ~ExtrapolateImageFunction() override = default;
};
} // end namespace itk
 
#endif