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 *  Point Cloud Library (PCL) - www.pointclouds.org
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#ifndef PCL_VISUALIZATION_POINT_PICKING_EVENT_H_
#define PCL_VISUALIZATION_POINT_PICKING_EVENT_H_

#include <pcl/pcl_macros.h>
#include <vector>

#include <vtkCommand.h>
class vtkRenderWindowInteractor;

namespace pcl
{
  namespace visualization
  {
    class PCL_EXPORTS PointPickingCallback : public vtkCommand
    {
      public:
        static PointPickingCallback *New () 
        { 
          return (new PointPickingCallback); 
        }

        PointPickingCallback () : x_ (0), y_ (0), z_ (0), idx_ (-1), pick_first_ (false) {}
      
        /** \brief Empty destructor */
        virtual ~PointPickingCallback () {}

        virtual void
        Execute (vtkObject *caller, unsigned long eventid, void*);

        int
        performSinglePick (vtkRenderWindowInteractor *iren);

        int
        performSinglePick (vtkRenderWindowInteractor *iren, float &x, float &y, float &z);

        int
        performAreaPick (vtkRenderWindowInteractor *iren, std::vector<int> &indices);

      private:
        float x_, y_, z_;
        int idx_;
        bool pick_first_;
     };

    /** /brief Class representing 3D point picking events. */
    class PCL_EXPORTS PointPickingEvent
    {
      public:
        PointPickingEvent (int idx) : idx_ (idx), idx2_ (-1), x_ (), y_ (), z_ (), x2_ (), y2_ (), z2_ () {}
        PointPickingEvent (int idx, float x, float y, float z) : idx_ (idx), idx2_ (-1), x_ (x), y_ (y), z_ (z), x2_ (), y2_ (), z2_ () {}

        PointPickingEvent (int idx1, int idx2, float x1, float y1, float z1, float x2, float y2, float z2) :
          idx_ (idx1), idx2_ (idx2), x_ (x1), y_ (y1), z_ (z1), x2_ (x2), y2_ (y2), z2_ (z2) 
        {}

        /** \brief Obtain the ID of a point that the user just clicked on.
          *  \warning If the cloud contains NaNs the index returned by this function will not correspond to the
          * original indices. To get the correct index either sanitize the input cloud to remove NaNs or use the 
          * PointPickingEvent::getPoint function to get the x,y,z of the picked point and then search the original 
          * cloud for the correct index. An example of how to do this can be found in the pp_callback function in
          * visualization/tools/pcd_viewer.cpp
          */
        inline int
        getPointIndex () const
        {
          return (idx_);
        }

        /** \brief Obtain the XYZ point coordinates of a point that the user just clicked on.
          * \param[out] x the x coordinate of the point that got selected by the user
          * \param[out] y the y coordinate of the point that got selected by the user
          * \param[out] z the z coordinate of the point that got selected by the user
          */
        inline void
        getPoint (float &x, float &y, float &z) const
        {
          x = x_; y = y_; z = z_;
        }

        /** \brief For situations when multiple points are selected in a sequence, return the point coordinates.
          * \param[out] x1 the x coordinate of the first point that got selected by the user
          * \param[out] y1 the y coordinate of the first point that got selected by the user
          * \param[out] z1 the z coordinate of the firts point that got selected by the user
          * \param[out] x2 the x coordinate of the second point that got selected by the user
          * \param[out] y2 the y coordinate of the second point that got selected by the user
          * \param[out] z2 the z coordinate of the second point that got selected by the user
          * \return true, if two points are available and have been clicked by the user, false otherwise
          */
        inline bool
        getPoints (float &x1, float &y1, float &z1, float &x2, float &y2, float &z2) const
        {
          if (idx2_ == -1)
            return (false);
          x1 = x_; y1 = y_; z1 = z_;
          x2 = x2_; y2 = y2_; z2 = z2_;
          return (true);
        }

        /** \brief For situations where multiple points are selected in a sequence, return the points indices.
          * \param[out] index_1 index of the first point selected by user
          * \param[out] index_2 index of the second point selected by user
          * \return true, if two points are available and have been clicked by the user, false otherwise
          * \warning If the cloud contains NaNs the index returned by this function will not correspond to the
          * original indices. To get the correct index either sanitize the input cloud to remove NaNs or use the 
          * PointPickingEvent::getPoint function to get the x,y,z of the picked point and then search the original 
          * cloud for the correct index. An example of how to do this can be found in the pp_callback function in
          * visualization/tools/pcd_viewer.cpp
          */
        inline bool
        getPointIndices (int &index_1, int &index_2) const
        {
          if (idx2_ == -1)
            return (false);
          index_1 = idx_;
          index_2 = idx2_;
          return (true);
        }

      private:
        int idx_, idx2_;

        float x_, y_, z_;
        float x2_, y2_, z2_;
    };
  } //namespace visualization
} //namespace pcl

#endif  /* PCL_VISUALIZATION_POINT_PICKING_EVENT_H_ */

