move_slow_and_clear.cpp

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* Author: Eitan Marder-Eppstein
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#include <move_slow_and_clear/move_slow_and_clear.h>
#include <pluginlib/class_list_macros.h>

PLUGINLIB_DECLARE_CLASS(move_slow_and_clear, MoveSlowAndClear, move_slow_and_clear::MoveSlowAndClear,
    nav_core::RecoveryBehavior)

namespace move_slow_and_clear
{
  MoveSlowAndClear::MoveSlowAndClear():global_costmap_(NULL), local_costmap_(NULL), 
                                       initialized_(false), remove_limit_thread_(NULL), limit_set_(false){}

  MoveSlowAndClear::~MoveSlowAndClear()
  {
    delete remove_limit_thread_;
  }

  void MoveSlowAndClear::initialize (std::string n, tf::TransformListener* tf,
      costmap_2d::Costmap2DROS* global_costmap,
      costmap_2d::Costmap2DROS* local_costmap)
  {
    global_costmap_ = global_costmap;
    local_costmap_ = local_costmap;

    ros::NodeHandle private_nh_("~/" + n);
    private_nh_.param("clearing_distance", clearing_distance_, 0.5);
    private_nh_.param("limited_trans_speed", limited_trans_speed_, 0.25);
    private_nh_.param("limited_rot_speed", limited_rot_speed_, 0.45);
    private_nh_.param("limited_distance", limited_distance_, 0.3);

    std::string planner_namespace;
    private_nh_.param("planner_namespace", planner_namespace, std::string("DWAPlannerROS"));

    planner_nh_ = ros::NodeHandle("~/" + planner_namespace);

    initialized_ = true;
  }

  void MoveSlowAndClear::runBehavior()
  {
    if(!initialized_)
    {
      ROS_ERROR("This recovery behavior has not been initialized, doing nothing.");
      return;
    }

    ROS_DEBUG("Running move slow and clear behavior");
    tf::Stamped<tf::Pose> global_pose, local_pose;
    global_costmap_->getRobotPose(global_pose);
    local_costmap_->getRobotPose(local_pose);

    std::vector<geometry_msgs::Point> global_poly, local_poly;

    geometry_msgs::Point pt;
    for(int i = -1; i <= 1; i+=2)
    {
      pt.x = global_pose.getOrigin().x() + i * clearing_distance_;
      pt.y = global_pose.getOrigin().y() + i * clearing_distance_;
      global_poly.push_back(pt);

      pt.x = global_pose.getOrigin().x() + i * clearing_distance_;
      pt.y = global_pose.getOrigin().y() + -1.0 * i * clearing_distance_;
      global_poly.push_back(pt);

      pt.x = local_pose.getOrigin().x() + i * clearing_distance_;
      pt.y = local_pose.getOrigin().y() + i * clearing_distance_;
      local_poly.push_back(pt);

      pt.x = local_pose.getOrigin().x() + i * clearing_distance_;
      pt.y = local_pose.getOrigin().y() + -1.0 * i * clearing_distance_;
      local_poly.push_back(pt);
    }

    //clear the desired space in both costmaps
    global_costmap_->setConvexPolygonCost(global_poly, costmap_2d::FREE_SPACE);
    local_costmap_->setConvexPolygonCost(local_poly, costmap_2d::FREE_SPACE);

    //lock... just in case we're already speed limited
    boost::mutex::scoped_lock l(mutex_);

    //get the old maximum speed for the robot... we'll want to set it back
    if(!limit_set_)
    {
      if(!planner_nh_.getParam("max_trans_vel", old_trans_speed_))
      {
        ROS_ERROR("The planner %s, does not have the parameter max_trans_vel", planner_nh_.getNamespace().c_str());
      }

      if(!planner_nh_.getParam("max_rot_vel", old_rot_speed_))
      {
        ROS_ERROR("The planner %s, does not have the parameter max_rot_vel", planner_nh_.getNamespace().c_str());
      }
    }

    //we also want to save our current position so that we can remove the speed limit we impose later on
    speed_limit_pose_ = global_pose;

    //limit the speed of the robot until it moves a certain distance
    setRobotSpeed(limited_trans_speed_, limited_rot_speed_);
    limit_set_ = true;
    distance_check_timer_ = private_nh_.createTimer(ros::Duration(0.1), &MoveSlowAndClear::distanceCheck, this);
  }

  double MoveSlowAndClear::getSqDistance()
  {
    tf::Stamped<tf::Pose> global_pose;
    global_costmap_->getRobotPose(global_pose);
    double x1 = global_pose.getOrigin().x();
    double y1 = global_pose.getOrigin().y();

    double x2 = speed_limit_pose_.getOrigin().x();
    double y2 = speed_limit_pose_.getOrigin().y();

    return (x2 - x1) * (x2 - x1) + (y2 - y1) * (y2 - y1);
  }

  void MoveSlowAndClear::distanceCheck(const ros::TimerEvent& e)
  {
    if(limited_distance_ * limited_distance_ <= getSqDistance())
    {
      ROS_INFO("Moved far enough, removing speed limit.");
      //have to do this because a system call within a timer cb does not seem to play nice
      if(remove_limit_thread_)
      {
        remove_limit_thread_->join();
        delete remove_limit_thread_;
      }
      remove_limit_thread_ = new boost::thread(boost::bind(&MoveSlowAndClear::removeSpeedLimit, this));

      distance_check_timer_.stop();
    }
  }

  void MoveSlowAndClear::removeSpeedLimit()
  {
    boost::mutex::scoped_lock l(mutex_);
    setRobotSpeed(old_trans_speed_, old_rot_speed_);
    limit_set_ = false;
  }

  void MoveSlowAndClear::setRobotSpeed(double trans_speed, double rot_speed)
  {
    std::ostringstream trans_command;
    trans_command << "rosrun dynamic_reconfigure dynparam set " << planner_nh_.getNamespace() << " max_trans_vel " << trans_speed;
    ROS_INFO("Recovery setting trans vel: %s", trans_command.str().c_str());
    if(system(trans_command.str().c_str()) < 0)
    {
      ROS_ERROR("Something went wrong in the system call to dynparam");
    }

    std::ostringstream rot_command;
    rot_command << "rosrun dynamic_reconfigure dynparam set " << planner_nh_.getNamespace() << " max_rot_vel " << rot_speed;
    ROS_INFO("Recovery setting rot vel: %s", rot_command.str().c_str());
    if(system(rot_command.str().c_str()) < 0)
    {
      ROS_INFO("Something went wrong in the system call to dynparam");
    }
  }

};