text: /*=========================================================================
   *
   *  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 itkRegularSphereMeshSource_h
  #define itkRegularSphereMeshSource_h
  
  #include "itkIntTypes.h"
  #include "itkMesh.h"
  #include "itkMeshSource.h"
  #include "itkTriangleCell.h"
  
  namespace itk
  {
  /** \class RegularSphereMeshSource
   * \brief
   * Inputs are the center of the mesh, the scale (radius in each dimension) of the mesh
   * and a resolution parameter, which corresponds to the recursion
   * depth whlie creating a spherical triangle mesh.
   *
   * Don't use recursion depths larger than 5, because mesh generation gets very slow.
   *
   * \author Thomas Boettger. Division Medical and Biological Informatics, German Cancer Research Center, Heidelberg.
   *
   * \ingroup ITKMesh
   */
  template< typename TOutputMesh >
  class ITK_TEMPLATE_EXPORT RegularSphereMeshSource:public MeshSource< TOutputMesh >
  {
  public:
    ITK_DISALLOW_COPY_AND_ASSIGN(RegularSphereMeshSource);
  
    /** Standard "Self" type alias. */
    using Self = RegularSphereMeshSource;
    using Superclass = itk::MeshSource< TOutputMesh >;
    using Pointer = itk::SmartPointer< Self >;
    using ConstPointer = itk::SmartPointer< const Self >;
  
    /** Method for creation through the object factory. */
    itkNewMacro(Self);
  
    /** Run-time type information (and related methods). */
    itkTypeMacro(RegularSphereMeshSource, MeshSource);
  
    /** Hold on to the type information specified by the template parameters. */
    using OutputMeshType = TOutputMesh;
    using MeshTraits = typename OutputMeshType::MeshTraits;
    using PointType = typename OutputMeshType::PointType;
    using PixelType = typename MeshTraits::PixelType;
    using VectorType = typename PointType::VectorType;
  
    /** Some convenient type alias. */
    using OutputMeshPointer = typename OutputMeshType::Pointer;
    using CellTraits = typename OutputMeshType::CellTraits;
    using PointsContainerPointer = typename OutputMeshType::PointsContainerPointer;
    using PointsContainer = typename OutputMeshType::PointsContainer;
  
    /** Define the triangular cell types which form the surface  */
    using CellInterfaceType = itk::CellInterface< PixelType, CellTraits >;
    using TriCellType = itk::TriangleCell< CellInterfaceType >;
    using TriCellAutoPointer = typename TriCellType::SelfAutoPointer;
    using CellAutoPointer = typename TriCellType::CellAutoPointer;
  
    using IndexPairType = std::pair< IdentifierType, IdentifierType >;
    using PointMapType = itk::MapContainer< IndexPairType, IdentifierType >;
  
    /** Set the resolution level to be used for generating cells in the Sphere.
     *  High values of this parameter will produce sphere with more triangles. */
    itkSetMacro(Resolution, unsigned int);
    itkGetConstMacro(Resolution, unsigned int);
  
    /** Set/Get Coordinates of the Sphere center. */
    itkSetMacro(Center, PointType);
    itkGetConstMacro(Center, PointType);
  
    /** Set/Get scales of the Sphere. This is a vector of values that can
     * actually be used for generating ellipsoids aligned with the coordinate
     * axis. */
    itkSetMacro(Scale,  VectorType);
    itkGetConstMacro(Scale,  VectorType);
  
  protected:
    RegularSphereMeshSource();
    ~RegularSphereMeshSource() override = default;
    void PrintSelf(std::ostream & os, itk::Indent indent) const override;
  
    void GenerateData() override;
  
    PointType Divide(const PointType & p1, const PointType & p2) const;
  
    void AddCell(OutputMeshType *mesh, const typename OutputMeshType::PointIdentifier *pointIds, IdentifierType idx);
  
    /** model center */
    PointType m_Center;
  
    /** models resolution */
    unsigned int m_Resolution;
  
    /** model scales */
    VectorType m_Scale;
  };
  } // end namespace itk
  
  #ifndef ITK_MANUAL_INSTANTIATION
  #include "itkRegularSphereMeshSource.hxx"
  #endif
  
  #endif //_itkRegularSphereMeshSource_h
  