costmap_2d_publisher.cpp

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 * Author: Eitan Marder-Eppstein
 *         David V. Lu!!
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#include "nav2_costmap_2d/costmap_2d_publisher.hpp"
 
#include <string>
#include <memory>
#include <utility>
 
#include "nav2_costmap_2d/cost_values.hpp"
 
namespace nav2_costmap_2d
{
 
char * Costmap2DPublisher::cost_translation_table_ = NULL;
 
Costmap2DPublisher::Costmap2DPublisher(
  const nav2_util::LifecycleNode::WeakPtr & parent,
  Costmap2D * costmap,
  std::string global_frame,
  std::string topic_name,
  bool always_send_full_costmap)
: costmap_(costmap),
  global_frame_(global_frame),
  topic_name_(topic_name),
  active_(false),
  always_send_full_costmap_(always_send_full_costmap)
{
  auto node = parent.lock();
  clock_ = node->get_clock();
  logger_ = node->get_logger();
 
  auto custom_qos = rclcpp::QoS(rclcpp::KeepLast(1)).transient_local().reliable();
 
  // TODO(bpwilcox): port onNewSubscription functionality for publisher
  costmap_pub_ = node->create_publisher<nav_msgs::msg::OccupancyGrid>(
    topic_name,
    custom_qos);
  costmap_raw_pub_ = node->create_publisher<nav2_msgs::msg::Costmap>(
    topic_name + "_raw",
    custom_qos);
  costmap_update_pub_ = node->create_publisher<map_msgs::msg::OccupancyGridUpdate>(
    topic_name + "_updates", custom_qos);
 
  // Create a service that will use the callback function to handle requests.
  costmap_service_ = node->create_service<nav2_msgs::srv::GetCostmap>(
    "get_costmap", std::bind(
      &Costmap2DPublisher::costmap_service_callback,
      this, std::placeholders::_1, std::placeholders::_2,
      std::placeholders::_3));
 
  if (cost_translation_table_ == NULL) {
    cost_translation_table_ = new char[256];
 
    // special values:
    cost_translation_table_[0] = 0;  // NO obstacle
    cost_translation_table_[253] = 99;  // INSCRIBED obstacle
    cost_translation_table_[254] = 100;  // LETHAL obstacle
    cost_translation_table_[255] = -1;  // UNKNOWN
 
    // regular cost values scale the range 1 to 252 (inclusive) to fit
    // into 1 to 98 (inclusive).
    for (int i = 1; i < 253; i++) {
      cost_translation_table_[i] = static_cast<char>(1 + (97 * (i - 1)) / 251);
    }
  }
 
  xn_ = yn_ = 0;
  x0_ = costmap_->getSizeInCellsX();
  y0_ = costmap_->getSizeInCellsY();
}
 
Costmap2DPublisher::~Costmap2DPublisher() {}
 
// TODO(bpwilcox): find equivalent/workaround to ros::SingleSubscriberPublishr
/*
void Costmap2DPublisher::onNewSubscription(const ros::SingleSubscriberPublisher& pub)
{
  prepareGrid();
  pub.publish(grid_);
} */
 
// prepare grid_ message for publication.
void Costmap2DPublisher::prepareGrid()
{
  std::unique_lock<Costmap2D::mutex_t> lock(*(costmap_->getMutex()));
  grid_resolution = costmap_->getResolution();
  grid_width = costmap_->getSizeInCellsX();
  grid_height = costmap_->getSizeInCellsY();
 
  grid_ = std::make_unique<nav_msgs::msg::OccupancyGrid>();
 
  grid_->header.frame_id = global_frame_;
  grid_->header.stamp = clock_->now();
 
  grid_->info.resolution = grid_resolution;
 
  grid_->info.width = grid_width;
  grid_->info.height = grid_height;
 
  double wx, wy;
  costmap_->mapToWorld(0, 0, wx, wy);
  grid_->info.origin.position.x = wx - grid_resolution / 2;
  grid_->info.origin.position.y = wy - grid_resolution / 2;
  grid_->info.origin.position.z = 0.0;
  grid_->info.origin.orientation.w = 1.0;
  saved_origin_x_ = costmap_->getOriginX();
  saved_origin_y_ = costmap_->getOriginY();
 
  grid_->data.resize(grid_->info.width * grid_->info.height);
 
  unsigned char * data = costmap_->getCharMap();
  for (unsigned int i = 0; i < grid_->data.size(); i++) {
    grid_->data[i] = cost_translation_table_[data[i]];
  }
}
 
void Costmap2DPublisher::prepareCostmap()
{
  std::unique_lock<Costmap2D::mutex_t> lock(*(costmap_->getMutex()));
  double resolution = costmap_->getResolution();
 
  costmap_raw_ = std::make_unique<nav2_msgs::msg::Costmap>();
 
  costmap_raw_->header.frame_id = global_frame_;
  costmap_raw_->header.stamp = clock_->now();
 
  costmap_raw_->metadata.layer = "master";
  costmap_raw_->metadata.resolution = resolution;
 
  costmap_raw_->metadata.size_x = costmap_->getSizeInCellsX();
  costmap_raw_->metadata.size_y = costmap_->getSizeInCellsY();
 
  double wx, wy;
  costmap_->mapToWorld(0, 0, wx, wy);
  costmap_raw_->metadata.origin.position.x = wx - resolution / 2;
  costmap_raw_->metadata.origin.position.y = wy - resolution / 2;
  costmap_raw_->metadata.origin.position.z = 0.0;
  costmap_raw_->metadata.origin.orientation.w = 1.0;
 
  costmap_raw_->data.resize(costmap_raw_->metadata.size_x * costmap_raw_->metadata.size_y);
 
  unsigned char * data = costmap_->getCharMap();
  for (unsigned int i = 0; i < costmap_raw_->data.size(); i++) {
    costmap_raw_->data[i] = data[i];
  }
}
 
void Costmap2DPublisher::publishCostmap()
{
  if (costmap_raw_pub_->get_subscription_count() > 0) {
    prepareCostmap();
    costmap_raw_pub_->publish(std::move(costmap_raw_));
  }
  float resolution = costmap_->getResolution();
 
  if (always_send_full_costmap_ || grid_resolution != resolution ||
    grid_width != costmap_->getSizeInCellsX() ||
    grid_height != costmap_->getSizeInCellsY() ||
    saved_origin_x_ != costmap_->getOriginX() ||
    saved_origin_y_ != costmap_->getOriginY())
  {
    if (costmap_pub_->get_subscription_count() > 0) {
      prepareGrid();
      costmap_pub_->publish(std::move(grid_));
    }
  } else if (x0_ < xn_) {
    if (costmap_update_pub_->get_subscription_count() > 0) {
      std::unique_lock<Costmap2D::mutex_t> lock(*(costmap_->getMutex()));
      // Publish Just an Update
      auto update = std::make_unique<map_msgs::msg::OccupancyGridUpdate>();
      update->header.stamp = rclcpp::Time();
      update->header.frame_id = global_frame_;
      update->x = x0_;
      update->y = y0_;
      update->width = xn_ - x0_;
      update->height = yn_ - y0_;
      update->data.resize(update->width * update->height);
      unsigned int i = 0;
      for (unsigned int y = y0_; y < yn_; y++) {
        for (unsigned int x = x0_; x < xn_; x++) {
          unsigned char cost = costmap_->getCost(x, y);
          update->data[i++] = cost_translation_table_[cost];
        }
      }
      costmap_update_pub_->publish(std::move(update));
    }
  }
 
  xn_ = yn_ = 0;
  x0_ = costmap_->getSizeInCellsX();
  y0_ = costmap_->getSizeInCellsY();
}
 
void
Costmap2DPublisher::costmap_service_callback(
  const std::shared_ptr<rmw_request_id_t>/*request_header*/,
  const std::shared_ptr<nav2_msgs::srv::GetCostmap::Request>/*request*/,
  const std::shared_ptr<nav2_msgs::srv::GetCostmap::Response> response)
{
  RCLCPP_DEBUG(logger_, "Received costmap service request");
 
  // TODO(bpwilcox): Grab correct orientation information
  tf2::Quaternion quaternion;
  quaternion.setRPY(0.0, 0.0, 0.0);
 
  auto size_x = costmap_->getSizeInCellsX();
  auto size_y = costmap_->getSizeInCellsY();
  auto data_length = size_x * size_y;
  unsigned char * data = costmap_->getCharMap();
  auto current_time = clock_->now();
 
  response->map.header.stamp = current_time;
  response->map.header.frame_id = global_frame_;
  response->map.metadata.size_x = size_x;
  response->map.metadata.size_y = size_y;
  response->map.metadata.resolution = costmap_->getResolution();
  response->map.metadata.layer = "master";
  response->map.metadata.map_load_time = current_time;
  response->map.metadata.update_time = current_time;
  response->map.metadata.origin.position.x = costmap_->getOriginX();
  response->map.metadata.origin.position.y = costmap_->getOriginY();
  response->map.metadata.origin.position.z = 0.0;
  response->map.metadata.origin.orientation = tf2::toMsg(quaternion);
  response->map.data.resize(data_length);
  response->map.data.assign(data, data + data_length);
}
 
}  // end namespace nav2_costmap_2d