text: /*
   * Copyright (C) 2005-2019 Centre National d'Etudes Spatiales (CNES)
   * Copyright (C) 2007-2012 Institut Mines Telecom / Telecom Bretagne
   *
   * This file is part of Orfeo Toolbox
   *
   *     https://www.orfeo-toolbox.org/
   *
   * 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
   *
   * 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 otbSOMbasedImageFilter_hxx
  #define otbSOMbasedImageFilter_hxx
  
  #include "otbSOMbasedImageFilter.h"
  
  namespace otb
  {
  
  namespace Functor
  {
  
  template <class TInput, class TOutput, class TDistanceMetric, class TMap>
  TOutput SOMbasedImageFilterFunctor<TInput, TOutput, TDistanceMetric, TMap>::operator()(const TInput& input)
  {
    return static_cast<TOutput>(GetMap()->GetPixel(this->GetWinner(input)));
  }
  
  template <class TInput, class TOutput, class TDistanceMetric, class TMap>
  void SOMbasedImageFilterFunctor<TInput, TOutput, TDistanceMetric, TMap>::SetMap(const MapType* theMap)
  {
    m_Map      = const_cast<MapType*>(theMap);
    m_Distance = DistanceType::New();
  }
  
  template <class TInput, class TOutput, class TDistanceMetric, class TMap>
  typename SOMbasedImageFilterFunctor<TInput, TOutput, TDistanceMetric, TMap>::IndexType
  SOMbasedImageFilterFunctor<TInput, TOutput, TDistanceMetric, TMap>::GetWinner(const NeuronType& sample)
  {
    typedef itk::ImageRegionIteratorWithIndex<MapType> IteratorType;
    IteratorType                                       it(GetMap(), GetMap()->GetLargestPossibleRegion());
    it.GoToBegin();
  
    IndexType minPos = it.GetIndex();
  
    double tempDistance, minDistance = GetDistance()->Evaluate(sample, it.Get());
    ++it;
  
    while (!it.IsAtEnd())
    {
      tempDistance = GetDistance()->Evaluate(sample, it.Get());
  
      if (tempDistance < minDistance)
      {
        minDistance = tempDistance;
        minPos      = it.GetIndex();
      }
  
      ++it;
    }
  
    return minPos;
  }
  
  } // end of namespace Functor
  
  /*
   * Implementation of the class SOMbasedImageFilter
   */
  template <class TInputImage, class TOutputImage, class TDistanceMetric, class TMap>
  SOMbasedImageFilter<TInputImage, TOutputImage, TDistanceMetric, TMap>::SOMbasedImageFilter()
  {
    this->SetNumberOfRequiredInputs(1);
    this->InPlaceOff();
  }
  
  template <class TInputImage, class TOutputImage, class TDistanceMetric, class TMap>
  void SOMbasedImageFilter<TInputImage, TOutputImage, TDistanceMetric, TMap>::SetMap(const MapType* theMap)
  {
    m_Map = const_cast<MapType*>(theMap);
    this->Modified();
  }
  
  template <class TInputImage, class TOutputImage, class TDistanceMetric, class TMap>
  void SOMbasedImageFilter<TInputImage, TOutputImage, TDistanceMetric, TMap>::BeforeThreadedGenerateData()
  {
    m_Map->Update();
    this->GetFunctor().SetMap(m_Map);
  }
  
  } // end of namespace otb
  
  #endif
  