text: /*=========================================================================
   *
   *  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 itkShapePositionLabelMapFilter_h
  #define itkShapePositionLabelMapFilter_h
  
  #include "itkInPlaceLabelMapFilter.h"
  
  namespace itk
  {
  /**
   *\class ShapePositionLabelMapFilter
   * \brief Mark a single pixel in the label object which correspond to a position given by an attribute
   *
   * \author Gaetan Lehmann. Biologie du Developpement et de la Reproduction, INRA de Jouy-en-Josas, France.
   *
   * This implementation was taken from the Insight Journal paper:
   * https://www.insight-journal.org/browse/publication/176
   *
   * \sa ShapeLabelObject, BinaryShapeOpeningImageFilter, LabelStatisticsOpeningImageFilter
   * \ingroup ImageEnhancement  MathematicalMorphologyImageFilters
   * \ingroup ITKLabelMap
   */
  template <typename TImage>
  class ITK_TEMPLATE_EXPORT ShapePositionLabelMapFilter : public InPlaceLabelMapFilter<TImage>
  {
  public:
    ITK_DISALLOW_COPY_AND_MOVE(ShapePositionLabelMapFilter);
  
    /** Standard class type aliases. */
    using Self = ShapePositionLabelMapFilter;
    using Superclass = InPlaceLabelMapFilter<TImage>;
    using Pointer = SmartPointer<Self>;
    using ConstPointer = SmartPointer<const Self>;
  
    /** Some convenient type alias. */
    using ImageType = TImage;
    using ImagePointer = typename ImageType::Pointer;
    using ImageConstPointer = typename ImageType::ConstPointer;
    using PixelType = typename ImageType::PixelType;
    using IndexType = typename ImageType::IndexType;
    using LabelObjectType = typename ImageType::LabelObjectType;
  
    using AttributeType = typename LabelObjectType::AttributeType;
  
    /** ImageDimension constants */
    static constexpr unsigned int ImageDimension = TImage::ImageDimension;
  
    /** Standard New method. */
    itkNewMacro(Self);
  
    /** Runtime information support. */
    itkTypeMacro(ShapePositionLabelMapFilter, InPlaceLabelMapFilter);
  
  #ifdef ITK_USE_CONCEPT_CHECKING
    // Begin concept checking
    /*  itkConceptMacro(InputEqualityComparableCheck,
        (Concept::EqualityComparable<InputImagePixelType>));
      itkConceptMacro(IntConvertibleToInputCheck,
        (Concept::Convertible<int, InputImagePixelType>));
      itkConceptMacro(InputOStreamWritableCheck,
        (Concept::OStreamWritable<InputImagePixelType>));*/
    // End concept checking
  #endif
  
    /**
     * Set/Get the attribute to use to get the object position. The default
     * is "Centroid".
     */
    itkGetConstMacro(Attribute, AttributeType);
    itkSetMacro(Attribute, AttributeType);
    void
    SetAttribute(const std::string & s)
    {
      this->SetAttribute(LabelObjectType::GetAttributeFromName(s));
    }
  
  protected:
    ShapePositionLabelMapFilter();
    ~ShapePositionLabelMapFilter() override = default;
  
    void
    ThreadedProcessLabelObject(LabelObjectType * labelObject) override;
  
    template <typename TAttributeAccessor>
    void
    TemplatedThreadedProcessLabelObject(const TAttributeAccessor & accessor, bool physical, LabelObjectType * labelObject)
    {
      using AttributeValueType = typename TAttributeAccessor::AttributeValueType;
      AttributeValueType position = accessor(labelObject);
      // change it to an index position if it is physical
      IndexType idx;
      if (physical)
      {
        using CoordinateType = double;
        Point<CoordinateType, ImageDimension> point;
        // copy the position to a point, required by TransformPhysicalPointToIndex
        for (unsigned int i = 0; i < ImageDimension; ++i)
        {
          // FIXME: This is a bug. The cast should be as in the following line
          // where CoordinateType is used as the type to cast to. We are temporarily
          // keeping this original line here to avoid confusing the patch for 64 bits.
          point[i] = static_cast<OffsetValueType>(position[i]); // FIXME: use next line instead.
          // point[i] = static_cast<CoordinateType>( position[i] );
        }
        idx = this->GetOutput()->TransformPhysicalPointToIndex(point);
      }
      else
      {
        // copy the position to the index, to avoid warnings
        for (unsigned int i = 0; i < ImageDimension; ++i)
        {
          idx[i] = static_cast<IndexValueType>(position[i]);
        }
      }
      // clear the label object
      labelObject->Clear();
      // and mark only the pixel we are interested in
      labelObject->AddIndex(idx);
    }
  
    void
    PrintSelf(std::ostream & os, Indent indent) const override;
  
    AttributeType m_Attribute;
  }; // end of class
  
  } // end namespace itk
  
  #ifndef ITK_MANUAL_INSTANTIATION
  #  include "itkShapePositionLabelMapFilter.hxx"
  #endif
  
  #endif
  