itkVectorInterpolateImageFunction.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 itkVectorInterpolateImageFunction_h
#define itkVectorInterpolateImageFunction_h
 
#include "itkImageFunction.h"
#include "itkFixedArray.h"
 
namespace itk
{

template <typename TInputImage, typename TCoordinate = double>
class ITK_TEMPLATE_EXPORT VectorInterpolateImageFunction
  : public ImageFunction<TInputImage, typename NumericTraits<typename TInputImage::PixelType>::RealType, TCoordinate>
{
public:
  ITK_DISALLOW_COPY_AND_MOVE(VectorInterpolateImageFunction);

  static constexpr unsigned int Dimension = TInputImage::PixelType::Dimension;

  static constexpr unsigned int ImageDimension = TInputImage::ImageDimension;

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

  itkOverrideGetNameOfClassMacro(VectorInterpolateImageFunction);

  using typename Superclass::InputImageType;
  using PixelType = typename InputImageType::PixelType;
  using ValueType = typename PixelType::ValueType;
  using RealType = typename NumericTraits<ValueType>::RealType;

  using typename Superclass::PointType;

  using typename Superclass::IndexType;

  using typename Superclass::ContinuousIndexType;

  using typename Superclass::OutputType;

  using CoordinateType = TCoordinate;
#ifndef ITK_FUTURE_LEGACY_REMOVE
  using CoordRepType ITK_FUTURE_DEPRECATED(
    "ITK 6 discourages using `CoordRepType`. Please use `CoordinateType` instead!") = CoordinateType;
#endif

  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
  {
    OutputType output;
    PixelType  input = this->GetInputImage()->GetPixel(index);
 
    for (unsigned int k = 0; k < this->GetInputImage()->GetNumberOfComponentsPerPixel(); ++k)
    {
      output[k] = static_cast<double>(input[k]);
    }
    return (output);
  }
 
protected:
  VectorInterpolateImageFunction() = default;
  ~VectorInterpolateImageFunction() override = default;
};
} // end namespace itk
 
#endif