path_dist_pruned.cpp

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#include <nav_2d_utils/path_ops.h>
#include <pluginlib/class_list_macros.h>

#include "mir_dwb_critics/path_dist_pruned.h"

namespace mir_dwb_critics {

bool PathDistPrunedCritic::prepare(
    const geometry_msgs::Pose2D &pose,
    const nav_2d_msgs::Twist2D &vel,
    const geometry_msgs::Pose2D &goal,
    const nav_2d_msgs::Path2D &global_plan) {

  const nav_core2::Costmap &costmap = *costmap_;
  const nav_grid::NavGridInfo &info = costmap.getInfo();

  auto plan = nav_2d_utils::adjustPlanResolution(global_plan, info.resolution).poses;


  // --- stolen from PathProgressCritic::getGoalPose ---
  // find the "start pose", i.e. the pose on the plan closest to the robot that is also on the local map
  unsigned int start_index = 0;
  double distance_to_start = std::numeric_limits<double>::infinity();
  bool started_path = false;
  for (unsigned int i = 0; i < plan.size(); i++) {
    double g_x = plan[i].x;
    double g_y = plan[i].y;
    unsigned int map_x, map_y;
    if (worldToGridBounded(info, g_x, g_y, map_x, map_y)
        && costmap(map_x, map_y) != nav_core2::Costmap::NO_INFORMATION) {
      // Still on the costmap. Continue.
      double distance = nav_2d_utils::poseDistance(plan[i], pose);
      if (distance_to_start > distance) {
        start_index = i;
        distance_to_start = distance;
        started_path = true;
      } else {
        // Plan is going away from the robot again. It's possible that it comes back and we would find a pose that's
        // even closer to the robot, but then we would skip over parts of the plan.
        break;
      }
    } else if (started_path) {
      // Off the costmap after being on the costmap.
      break;
    }
    // else, we have not yet found a point on the costmap, so we just continue
  }

  if (!started_path) {
    ROS_ERROR_NAMED("PathDistPrunedCritic", "None of the points of the global plan were in the local costmap.");
    return false;
  }
  // ---------------------------------------------------

  // remove the first part of the path, everything before start_index, to
  // disregard that part in the PathDistCritic implementation.
  nav_2d_msgs::Path2D global_plan_pruned;
  global_plan_pruned.header = global_plan.header;
  global_plan_pruned.poses = std::vector<geometry_msgs::Pose2D>(
      plan.begin() + start_index,
      plan.end());

  return dwb_critics::PathDistCritic::prepare(pose, vel, goal, global_plan_pruned);
}

}  // namespace mir_dwb_critics

PLUGINLIB_EXPORT_CLASS(mir_dwb_critics::PathDistPrunedCritic, dwb_local_planner::TrajectoryCritic)