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
   *
   *         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 itkLevelSetEquationCurvatureTerm_hxx
  #define itkLevelSetEquationCurvatureTerm_hxx
  
  #include "itkLevelSetEquationCurvatureTerm.h"
  
  namespace itk
  {
  template <typename TInput, typename TLevelSetContainer, typename TCurvatureImage>
  LevelSetEquationCurvatureTerm<TInput, TLevelSetContainer, TCurvatureImage>::LevelSetEquationCurvatureTerm()
  {
    for (unsigned int i = 0; i < ImageDimension; i++)
    {
      this->m_NeighborhoodScales[i] = 1.0;
    }
    this->m_TermName = "Curvature term";
    this->m_RequiredData.insert("MeanCurvature");
    this->m_UseCurvatureImage = false;
  }
  
  template <typename TInput, typename TLevelSetContainer, typename TCurvatureImage>
  void
  LevelSetEquationCurvatureTerm<TInput, TLevelSetContainer, TCurvatureImage>::SetCurvatureImage(
    CurvatureImageType * iImage)
  {
    m_CurvatureImage = iImage;
    m_UseCurvatureImage = true;
    this->Modified();
  }
  
  template <typename TInput, typename TLevelSetContainer, typename TCurvatureImage>
  typename LevelSetEquationCurvatureTerm<TInput, TLevelSetContainer, TCurvatureImage>::LevelSetOutputRealType
  LevelSetEquationCurvatureTerm<TInput, TLevelSetContainer, TCurvatureImage>::Value(const LevelSetInputIndexType & iP,
                                                                                    const LevelSetDataType &       iData)
  {
    // MeanCurvature has should be computed by this point.
    itkAssertInDebugAndIgnoreInReleaseMacro(iData.MeanCurvature.m_Computed == true);
  
    if (!m_UseCurvatureImage)
    {
      return iData.MeanCurvature.m_Value;
    }
    else
    {
      return m_CurvatureImage->GetPixel(iP) * iData.MeanCurvature.m_Value;
    }
  }
  
  template <typename TInput, typename TLevelSetContainer, typename TCurvatureImage>
  void
  LevelSetEquationCurvatureTerm<TInput, TLevelSetContainer, TCurvatureImage>::InitializeParameters()
  {
    this->SetUp();
  
    if (m_UseCurvatureImage)
    {
      if (m_CurvatureImage.IsNull())
      {
        itkGenericExceptionMacro(<< "m_UseCurvatureImage is true and m_CurvatureImage is null");
      }
    }
  }
  
  template <typename TInput, typename TLevelSetContainer, typename TCurvatureImage>
  void
  LevelSetEquationCurvatureTerm<TInput, TLevelSetContainer, TCurvatureImage>::Initialize(const LevelSetInputIndexType &)
  {}
  
  template <typename TInput, typename TLevelSetContainer, typename TCurvatureImage>
  void
  LevelSetEquationCurvatureTerm<TInput, TLevelSetContainer, TCurvatureImage>::Update()
  {}
  
  template <typename TInput, typename TLevelSetContainer, typename TCurvatureImage>
  void
  LevelSetEquationCurvatureTerm<TInput, TLevelSetContainer, TCurvatureImage>::UpdatePixel(
    const LevelSetInputIndexType & itkNotUsed(iP),
    const LevelSetOutputRealType & itkNotUsed(oldValue),
    const LevelSetOutputRealType & itkNotUsed(newValue))
  {}
  
  template <typename TInput, typename TLevelSetContainer, typename TCurvatureImage>
  typename LevelSetEquationCurvatureTerm<TInput, TLevelSetContainer, TCurvatureImage>::LevelSetOutputRealType
  LevelSetEquationCurvatureTerm<TInput, TLevelSetContainer, TCurvatureImage>::Value(const LevelSetInputIndexType & iP)
  {
    if (!m_UseCurvatureImage)
    {
      return this->m_CurrentLevelSetPointer->EvaluateMeanCurvature(iP);
    }
    else
    {
      return m_CurvatureImage->GetPixel(iP) * this->m_CurrentLevelSetPointer->EvaluateMeanCurvature(iP);
    }
  }
  
  } // namespace itk
  #endif
  