SBL.h

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/* Author: Ioan Sucan */
 
#ifndef OMPL_GEOMETRIC_PLANNERS_SBL_SBL_
#define OMPL_GEOMETRIC_PLANNERS_SBL_SBL_
 
#include "ompl/geometric/planners/PlannerIncludes.h"
#include "ompl/base/ProjectionEvaluator.h"
#include "ompl/datastructures/Grid.h"
#include "ompl/datastructures/PDF.h"
#include <vector>
 
namespace ompl
{
    namespace geometric
    {

        class SBL : public base::Planner
        {
        public:
            SBL(const base::SpaceInformationPtr &si);
 
            ~SBL() override;

            void setProjectionEvaluator(const base::ProjectionEvaluatorPtr &projectionEvaluator)
            {
                projectionEvaluator_ = projectionEvaluator;
            }

            void setProjectionEvaluator(const std::string &name)
            {
                projectionEvaluator_ = si_->getStateSpace()->getProjection(name);
            }

            const base::ProjectionEvaluatorPtr &getProjectionEvaluator() const
            {
                return projectionEvaluator_;
            }

            void setRange(double distance)
            {
                maxDistance_ = distance;
            }

            double getRange() const
            {
                return maxDistance_;
            }
 
            void setup() override;
 
            base::PlannerStatus solve(const base::PlannerTerminationCondition &ptc) override;
 
            void clear() override;
 
            void getPlannerData(base::PlannerData &data) const override;
 
        protected:
            struct MotionInfo;

            using GridCell = Grid<MotionInfo>::Cell;

            using CellPDF = PDF<GridCell *>;

            class Motion
            {
            public:
                Motion() = default;

                Motion(const base::SpaceInformationPtr &si) : state(si->allocState())
                {
                }

                const base::State *root{nullptr};

                base::State *state{nullptr};

                Motion *parent{nullptr};

                bool valid{false};

                std::vector<Motion *> children;
            };

            struct MotionInfo
            {
                Motion *operator[](unsigned int i)
                {
                    return motions_[i];
                }
                std::vector<Motion *>::iterator begin()
                {
                    return motions_.begin();
                }
                void erase(std::vector<Motion *>::iterator iter)
                {
                    motions_.erase(iter);
                }
                void push_back(Motion *m)
                {
                    motions_.push_back(m);
                }
                unsigned int size() const
                {
                    return motions_.size();
                }
                bool empty() const
                {
                    return motions_.empty();
                }
 
                std::vector<Motion *> motions_;
                CellPDF::Element *elem_;
            };

            struct TreeData
            {
                TreeData() = default;

                Grid<MotionInfo> grid{0};

                unsigned int size{0};

                CellPDF pdf;
            };

            void freeMemory()
            {
                freeGridMotions(tStart_.grid);
                freeGridMotions(tGoal_.grid);
            }

            void freeGridMotions(Grid<MotionInfo> &grid);

            void addMotion(TreeData &tree, Motion *motion);

            Motion *selectMotion(TreeData &tree);

            void removeMotion(TreeData &tree, Motion *motion);

            bool isPathValid(TreeData &tree, Motion *motion);

            bool checkSolution(bool start, TreeData &tree, TreeData &otherTree, Motion *motion,
                               std::vector<Motion *> &solution);

            base::ValidStateSamplerPtr sampler_;

            base::ProjectionEvaluatorPtr projectionEvaluator_;

            TreeData tStart_;

            TreeData tGoal_;

            double maxDistance_{0.};

            RNG rng_;

            std::pair<base::State *, base::State *> connectionPoint_{nullptr, nullptr};
        };
    }  // namespace geometric
}  // namespace ompl
 
#endif