fix_start_state_path_constraints.cpp

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/* Author: Ioan Sucan */

#include <moveit/planning_request_adapter/planning_request_adapter.h>
#include <moveit/robot_state/conversions.h>
#include <class_loader/class_loader.h>
#include <moveit/trajectory_processing/trajectory_tools.h>
#include <ros/ros.h>

namespace default_planner_request_adapters
{

class FixStartStatePathConstraints : public planning_request_adapter::PlanningRequestAdapter
{
public:

  FixStartStatePathConstraints() : planning_request_adapter::PlanningRequestAdapter()
  {
  }

  virtual std::string getDescription() const { return "Fix Start State Path Constraints"; }


  virtual bool adaptAndPlan(const PlannerFn &planner,
                            const planning_scene::PlanningSceneConstPtr& planning_scene,
                            const planning_interface::MotionPlanRequest &req,
                            planning_interface::MotionPlanResponse &res,
                            std::vector<std::size_t> &added_path_index) const
  {
    ROS_DEBUG("Running '%s'", getDescription().c_str());

    // get the specified start state
    robot_state::RobotState start_state = planning_scene->getCurrentState();
    robot_state::robotStateMsgToRobotState(planning_scene->getTransforms(), req.start_state, start_state);

    // if the start state is otherwise valid but does not meet path constraints
    if (planning_scene->isStateValid(start_state, req.group_name) &&
        !planning_scene->isStateValid(start_state, req.path_constraints, req.group_name))
    {
      ROS_INFO("Path constraints not satisfied for start state...");
      planning_scene->isStateValid(start_state, req.path_constraints, req.group_name, true);
      ROS_INFO("Planning to path constraints...");

      planning_interface::MotionPlanRequest req2 = req;
      req2.goal_constraints.resize(1);
      req2.goal_constraints[0] = req.path_constraints;
      req2.path_constraints = moveit_msgs::Constraints();
      planning_interface::MotionPlanResponse res2;
      // we call the planner for this additional request, but we do not want to include potential 
      // index information from that call
      std::vector<std::size_t> added_path_index_temp;
      added_path_index_temp.swap(added_path_index);
      bool solved1 = planner(planning_scene, req2, res2);
      added_path_index_temp.swap(added_path_index);
      
      if (solved1)
      {
        planning_interface::MotionPlanRequest req3 = req;
        ROS_INFO("Planned to path constraints. Resuming original planning request.");

        // extract the last state of the computed motion plan and set it as the new start state
        robot_state::robotStateToRobotStateMsg(res2.trajectory_->getLastWayPoint(), req3.start_state);
        bool solved2 = planner(planning_scene, req3, res);
        res.planning_time_ += res2.planning_time_;

        if (solved2)
        {
          // since we add a prefix, we need to correct any existing index positions
          for (std::size_t i = 0 ; i < added_path_index.size() ; ++i)
            added_path_index[i] += res2.trajectory_->getWayPointCount();
          
          // we mark the fact we insert a prefix path (we specify the index position we just added)
          for (std::size_t i = 0 ; i < res2.trajectory_->getWayPointCount() ; ++i)
            added_path_index.push_back(i);
          
          // we need to append the solution paths.
          res2.trajectory_->append(*res.trajectory_, 0.0);
          res2.trajectory_->swap(*res.trajectory_);
          return true;
        }
        else
          return false;
      }
      else
      {
        ROS_WARN("Unable to plan to path constraints. Running usual motion plan.");
        bool result = planner(planning_scene, req, res);
        res.planning_time_ += res2.planning_time_;
        return result;
      }
    }
    else
    {
      ROS_DEBUG("Path constraints are OK. Running usual motion plan.");
      return planner(planning_scene, req, res);
    }
  }

};

}

CLASS_LOADER_REGISTER_CLASS(default_planner_request_adapters::FixStartStatePathConstraints,
                            planning_request_adapter::PlanningRequestAdapter);