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#ifndef PCL_REGISTRATION_TRANSFORMATION_ESTIMATION_3POINT_H_
#define PCL_REGISTRATION_TRANSFORMATION_ESTIMATION_3POINT_H_

#include <pcl/registration/transformation_estimation.h>

namespace pcl
{
  namespace registration
  {
    /** \brief TransformationEstimation3Points represents the class for transformation estimation based on:
      *   - correspondence vectors of 3 pairs (planar case)
      *   - two point clouds (source and target) of size 3
      *   - a point cloud with a set of 3 indices (source), and another point cloud (target)
      *   - two point clouds with two sets of indices (source and target) of the size 3
      *
      * \note The class is templated on the source and target point types as well as on the output scalar of the transformation matrix 
      * (i.e., float or double). Default: float.
      *
      * \author P.W.Theiler
      * \ingroup registration
      */
    template <typename PointSource, typename PointTarget, typename Scalar = float>
    class TransformationEstimation3Point : public TransformationEstimation <PointSource, PointTarget, Scalar>
    {
      public:
        /** \cond */
        typedef boost::shared_ptr<TransformationEstimation3Point<PointSource, PointTarget, Scalar> > Ptr;
        typedef boost::shared_ptr<const TransformationEstimation3Point<PointSource, PointTarget, Scalar> > ConstPtr;        
        typedef typename TransformationEstimation<PointSource, PointTarget, Scalar>::Matrix4 Matrix4;
        /** \endcond */

        /** \brief Constructor */
        TransformationEstimation3Point () 
        {};

        /** \brief Destructor */
        virtual ~TransformationEstimation3Point () 
        {};

        /** \brief Estimate a rigid rotation transformation between a source and a target point cloud.
          * \param[in] cloud_src the source point cloud dataset
          * \param[in] cloud_tgt the target point cloud dataset
          * \param[out] transformation_matrix the resultant transformation matrix
          */
        virtual void
        estimateRigidTransformation (
            const pcl::PointCloud<PointSource> &cloud_src,
            const pcl::PointCloud<PointTarget> &cloud_tgt,
            Matrix4 &transformation_matrix) const;

        /** \brief Estimate a rigid rotation transformation between a source and a target point cloud.
          * \param[in] cloud_src the source point cloud dataset
          * \param[in] indices_src the vector of indices describing the points of interest in \a cloud_src
          * \param[in] cloud_tgt the target point cloud dataset
          * \param[out] transformation_matrix the resultant transformation matrix
          */
        virtual void
        estimateRigidTransformation (
            const pcl::PointCloud<PointSource> &cloud_src,
            const std::vector<int> &indices_src,
            const pcl::PointCloud<PointTarget> &cloud_tgt,
            Matrix4 &transformation_matrix) const;

        /** \brief Estimate a rigid rotation transformation between a source and a target point cloud.
          * \param[in] cloud_src the source point cloud dataset
          * \param[in] indices_src the vector of indices describing the points of interest in \a cloud_src
          * \param[in] cloud_tgt the target point cloud dataset
          * \param[in] indices_tgt the vector of indices describing the correspondences of the interest points from \a indices_src
          * \param[out] transformation_matrix the resultant transformation matrix
          */
        virtual void
        estimateRigidTransformation (
            const pcl::PointCloud<PointSource> &cloud_src,
            const std::vector<int> &indices_src,
            const pcl::PointCloud<PointTarget> &cloud_tgt,
            const std::vector<int> &indices_tgt,
            Matrix4 &transformation_matrix) const;

        /** \brief Estimate a rigid rotation transformation between a source and a target point cloud.
          * \param[in] cloud_src the source point cloud dataset
          * \param[in] cloud_tgt the target point cloud dataset
          * \param[in] correspondences the vector of correspondences between source and target point cloud
          * \param[out] transformation_matrix the resultant transformation matrix
          */
        virtual void
        estimateRigidTransformation (
            const pcl::PointCloud<PointSource> &cloud_src,
            const pcl::PointCloud<PointTarget> &cloud_tgt,
            const pcl::Correspondences &correspondences,
            Matrix4 &transformation_matrix) const;

        protected:

        /** \brief Estimate a rigid rotation transformation between a source and a target
          * \param[in] source_it an iterator over the source point cloud dataset
          * \param[in] target_it an iterator over the target point cloud dataset
          * \param[out] transformation_matrix the resultant transformation matrix
          */
        void
        estimateRigidTransformation (ConstCloudIterator<PointSource>& source_it,
                                     ConstCloudIterator<PointTarget>& target_it,
                                     Matrix4 &transformation_matrix) const;
    };
  }; // namespace registration  
}; // namespace registration  

#include <pcl/registration/impl/transformation_estimation_3point.hpp>

#endif // PCL_REGISTRATION_TRANSFORMATION_ESTIMATION_3POINT_H_
