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 *  Point Cloud Library (PCL) - www.pointclouds.org
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#pragma once

#include <pcl/filters/filter_indices.h>
#include <pcl/search/search.h> // for Search

namespace pcl
{
  /** \brief LocalMaximum downsamples the cloud, by eliminating points that are locally maximal.
    *
    * The LocalMaximum class analyzes each point and removes those that are
    * found to be locally maximal with respect to their neighbors (found via
    * radius search). The comparison is made in the z dimension only at this
    * time.
    *
    * \author Bradley J Chambers
    * \ingroup filters
    */
  template <typename PointT>
  class LocalMaximum: public FilterIndices<PointT>
  {
    protected:
      using PointCloud = typename FilterIndices<PointT>::PointCloud;
      using SearcherPtr = typename pcl::search::Search<PointT>::Ptr;

    public:
      /** \brief Empty constructor. */
      LocalMaximum (bool extract_removed_indices = false) :
        FilterIndices<PointT>::FilterIndices (extract_removed_indices),
        searcher_ ()
      {
        filter_name_ = "LocalMaximum";
      }

      /** \brief Set the radius to use to determine if a point is the local max.
        * \param[in] radius The radius to use to determine if a point is the local max.
        */
      inline void
      setRadius (float radius) { radius_ = radius; }

      /** \brief Get the radius to use to determine if a point is the local max.
        * \return The radius to use to determine if a point is the local max.
        */
      inline float
      getRadius () const { return (radius_); }

    protected:
      using PCLBase<PointT>::input_;
      using PCLBase<PointT>::indices_;
      using Filter<PointT>::filter_name_;
      using Filter<PointT>::getClassName;
      using FilterIndices<PointT>::negative_;
      using FilterIndices<PointT>::extract_removed_indices_;
      using FilterIndices<PointT>::removed_indices_;

      /** \brief Downsample a Point Cloud by eliminating points that are locally maximal in z
        * \param[out] output the resultant point cloud message
        */
      void
      applyFilter (PointCloud &output) override;

      /** \brief Filtered results are indexed by an indices array.
        * \param[out] indices The resultant indices.
        */
      void
      applyFilter (Indices &indices) override
      {
        applyFilterIndices (indices);
      }

      /** \brief Filtered results are indexed by an indices array.
        * \param[out] indices The resultant indices.
        */
      void
      applyFilterIndices (Indices &indices);

    private:
      /** \brief A pointer to the spatial search object. */
      SearcherPtr searcher_;

      /** \brief The radius to use to determine if a point is the local max. */
      float radius_{1.0f};
  };
}

#ifdef PCL_NO_PRECOMPILE
#include <pcl/filters/impl/local_maximum.hpp>
#endif
