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/*=========================================================================

  Program:   ORFEO Toolbox
  Language:  C++
  Date:      $Date$
  Version:   $Revision$


  Copyright (c) Centre National d'Etudes Spatiales. All rights reserved.
  See OTBCopyright.txt for details.


     This software is distributed WITHOUT ANY WARRANTY; without even
     the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
     PURPOSE.  See the above copyright notices for more information.

=========================================================================*/
#ifndef otbPathMeanDistanceFunctor_h
#define otbPathMeanDistanceFunctor_h

#include "otbMacro.h"
#include "otbMath.h"

namespace otb
{

/** \class PathMeanDistanceFunctor
 *  \brief Functor to select path according to the average distance between points
 *
 * This functor compute the average distance between each point of a path
 * and return true is the distance is above the threshold, false otherwise.
 *
 * \sa UnaryFunctorObjectListBooleanFilter
 *
 *  \ingroup Functor
 *
 * \ingroup OTBPath
 */
template <class TInput1>
class PathMeanDistanceFunctor
{
public:

  void SetThreshold(double threshold)
  {
    m_Threshold = threshold;
  }
  double GetThreshold(void) const
  {
    return (m_Threshold);
  }

  PathMeanDistanceFunctor()
  {
    m_Threshold = 0.2;
  }
  ~PathMeanDistanceFunctor() {}

  inline bool operator ()(const TInput1& input)
  {

    double meanDistance = 0.0;
    typedef typename TInput1::ObjectType::VertexListType::ConstIterator VertexListConstIteratorType;
    typedef typename TInput1::ObjectType::VertexType                    VertexType;
    VertexListConstIteratorType beginIt = input->GetVertexList()->Begin();

    VertexType v1 = beginIt.Value();
    VertexType v2 = beginIt.Value();
    ++beginIt;
    while (beginIt != input->GetVertexList()->End())
      {
      v1 = v2;
      v2 = beginIt.Value();
      meanDistance += vcl_sqrt(vcl_pow(v1[0] - v2[0], 2) + vcl_pow(v1[1] - v2[1], 2));
      ++beginIt;
      }

    double nbVertices = static_cast<double>(input->GetVertexList()->Size());
    if (nbVertices > 1)
      {
      meanDistance = meanDistance / (nbVertices - 1);
      }
    else
      {
      itkGenericExceptionMacro(<< "Object with only one vertex!");
      }

    /*     std::cout << "Num vertex: " << nbVertices << std::endl;
         std::cout << "Mean dist: " << meanDistance << std::endl;
    */
    if (meanDistance > m_Threshold)
      {
      return true;
      }
    else
      {
      return false;
      }
  }

private:
  double m_Threshold;
};

}

#endif