publisher.cpp

/*
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#include "dwb_core/publisher.hpp"
 
#include <algorithm>
#include <memory>
#include <string>
#include <vector>
#include <utility>
 
#include "sensor_msgs/point_cloud2_iterator.hpp"
#include "nav_2d_utils/conversions.hpp"
#include "sensor_msgs/msg/point_cloud2.hpp"
#include "visualization_msgs/msg/marker_array.hpp"
#include "visualization_msgs/msg/marker.hpp"
 
using std::max;
using std::string;
 
namespace dwb_core
{
 
DWBPublisher::DWBPublisher(
  const nav2::LifecycleNode::WeakPtr & parent,
  const std::string & plugin_name)
: node_(parent),
  plugin_name_(plugin_name)
{
  auto node = node_.lock();
  clock_ = node->get_clock();
}
 
nav2::CallbackReturn
DWBPublisher::on_configure()
{
  auto node = node_.lock();
  if (!node) {
    throw std::runtime_error{"Failed to lock node"};
  }
 
  publish_evaluation_ = node->declare_or_get_parameter(
    plugin_name_ + ".publish_evaluation", true);
  publish_local_plan_ = node->declare_or_get_parameter(
    plugin_name_ + ".publish_local_plan", true);
  publish_trajectories_ = node->declare_or_get_parameter(
    plugin_name_ + ".publish_trajectories", true);
  publish_cost_grid_pc_ = node->declare_or_get_parameter(
    plugin_name_ + ".publish_cost_grid_pc", false);
  double marker_lifetime = node->declare_or_get_parameter(
    plugin_name_ + ".marker_lifetime", 0.1);
  marker_lifetime_ = rclcpp::Duration::from_seconds(marker_lifetime);
 
  eval_pub_ = node->create_publisher<dwb_msgs::msg::LocalPlanEvaluation>("evaluation");
  local_pub_ = node->create_publisher<nav_msgs::msg::Path>("local_plan");
  marker_pub_ = node->create_publisher<visualization_msgs::msg::MarkerArray>("marker");
  cost_grid_pc_pub_ = node->create_publisher<sensor_msgs::msg::PointCloud2>("cost_cloud");
 
  return nav2::CallbackReturn::SUCCESS;
}
 
nav2::CallbackReturn
DWBPublisher::on_activate()
{
  eval_pub_->on_activate();
  local_pub_->on_activate();
  marker_pub_->on_activate();
  cost_grid_pc_pub_->on_activate();
 
  return nav2::CallbackReturn::SUCCESS;
}
 
nav2::CallbackReturn
DWBPublisher::on_deactivate()
{
  eval_pub_->on_deactivate();
  local_pub_->on_deactivate();
  marker_pub_->on_deactivate();
  cost_grid_pc_pub_->on_deactivate();
 
  return nav2::CallbackReturn::SUCCESS;
}
 
nav2::CallbackReturn
DWBPublisher::on_cleanup()
{
  eval_pub_.reset();
  local_pub_.reset();
  marker_pub_.reset();
  cost_grid_pc_pub_.reset();
 
  return nav2::CallbackReturn::SUCCESS;
}
 
void
DWBPublisher::publishEvaluation(std::shared_ptr<dwb_msgs::msg::LocalPlanEvaluation> results)
{
  if (results) {
    if (publish_evaluation_ && eval_pub_->get_subscription_count() > 0) {
      auto msg = std::make_unique<dwb_msgs::msg::LocalPlanEvaluation>(*results);
      eval_pub_->publish(std::move(msg));
    }
    publishTrajectories(*results);
  }
}
 
void
DWBPublisher::publishTrajectories(const dwb_msgs::msg::LocalPlanEvaluation & results)
{
  if (marker_pub_->get_subscription_count() < 1) {return;}
 
  if (!publish_trajectories_) {return;}
  auto ma = std::make_unique<visualization_msgs::msg::MarkerArray>();
  visualization_msgs::msg::Marker m;
 
  if (results.twists.size() == 0) {return;}
 
  geometry_msgs::msg::Point pt;
 
  m.header = results.header;
  m.type = m.LINE_STRIP;
  m.pose.orientation.w = 1;
  m.scale.x = 0.002;
  m.color.a = 1.0;
  m.lifetime = marker_lifetime_;
 
  double best_cost = results.twists[results.best_index].total;
  double worst_cost = results.twists[results.worst_index].total;
  double denominator = worst_cost - best_cost;
 
  if (std::fabs(denominator) < 1e-9) {
    denominator = 1.0;
  }
 
  unsigned currentValidId = 0;
  unsigned currentInvalidId = 0;
  string validNamespace("ValidTrajectories");
  string invalidNamespace("InvalidTrajectories");
  for (unsigned int i = 0; i < results.twists.size(); i++) {
    const dwb_msgs::msg::TrajectoryScore & twist = results.twists[i];
    double displayLevel = (twist.total - best_cost) / denominator;
    if (twist.total >= 0) {
      m.color.r = displayLevel;
      m.color.g = 1.0 - displayLevel;
      m.color.b = 0;
      m.color.a = 1.0;
      m.ns = validNamespace;
      m.id = currentValidId;
      ++currentValidId;
    } else {
      m.color.r = 0;
      m.color.g = 0;
      m.color.b = 0;
      m.color.a = 1.0;
      m.ns = invalidNamespace;
      m.id = currentInvalidId;
      ++currentInvalidId;
    }
    m.points.clear();
    for (unsigned int j = 0; j < twist.traj.poses.size(); ++j) {
      pt.x = twist.traj.poses[j].position.x;
      pt.y = twist.traj.poses[j].position.y;
      pt.z = 0;
      m.points.push_back(pt);
    }
    ma->markers.push_back(m);
  }
  marker_pub_->publish(std::move(ma));
}
 
void
DWBPublisher::publishLocalPlan(
  const std_msgs::msg::Header & header,
  const dwb_msgs::msg::Trajectory2D & traj)
{
  if (!publish_local_plan_) {return;}
 
  auto path =
    std::make_unique<nav_msgs::msg::Path>(
    nav_2d_utils::posesToPath(
      traj.poses, header.frame_id,
      header.stamp));
 
  if (local_pub_->get_subscription_count() > 0) {
    local_pub_->publish(std::move(path));
  }
}
 
void
DWBPublisher::publishCostGrid(
  const std::shared_ptr<nav2_costmap_2d::Costmap2DROS> costmap_ros,
  const std::vector<TrajectoryCritic::Ptr> critics)
{
  if (cost_grid_pc_pub_->get_subscription_count() < 1) {return;}
 
  if (!publish_cost_grid_pc_) {return;}
 
  auto cost_grid_pc = std::make_unique<sensor_msgs::msg::PointCloud2>();
  cost_grid_pc->header.frame_id = costmap_ros->getGlobalFrameID();
  cost_grid_pc->header.stamp = clock_->now();
 
  nav2_costmap_2d::Costmap2D * costmap = costmap_ros->getCostmap();
  double x_coord, y_coord;
  unsigned int size_x = costmap->getSizeInCellsX();
  unsigned int size_y = costmap->getSizeInCellsY();
 
  std::vector<std::pair<std::string, std::vector<float>>> cost_channels;
  std::vector<float> total_cost(size_x * size_y, 0.0);
 
  for (TrajectoryCritic::Ptr critic : critics) {
    unsigned int channel_index = cost_channels.size();
    critic->addCriticVisualization(cost_channels);
    if (channel_index == cost_channels.size()) {
      // No channels were added, so skip to next critic
      continue;
    }
    double scale = critic->getScale();
    for (unsigned int i = 0; i < size_x * size_y; i++) {
      total_cost[i] += cost_channels[channel_index].second[i] * scale;
    }
  }
 
  cost_channels.push_back(std::make_pair("total_cost", total_cost));
 
  cost_grid_pc->width = size_x * size_y;
  cost_grid_pc->height = 1;
  cost_grid_pc->fields.resize(3 + cost_channels.size());  // x,y,z, + cost channels
  cost_grid_pc->is_dense = true;
  cost_grid_pc->is_bigendian = false;
 
  int offset = 0;
  for (size_t i = 0; i < cost_grid_pc->fields.size(); ++i, offset += 4) {
    cost_grid_pc->fields[i].offset = offset;
    cost_grid_pc->fields[i].count = 1;
    cost_grid_pc->fields[i].datatype = sensor_msgs::msg::PointField::FLOAT32;
    if (i >= 3) {
      cost_grid_pc->fields[i].name = cost_channels[i - 3].first;
    }
  }
 
  cost_grid_pc->fields[0].name = "x";
  cost_grid_pc->fields[1].name = "y";
  cost_grid_pc->fields[2].name = "z";
 
  cost_grid_pc->point_step = offset;
  cost_grid_pc->row_step = cost_grid_pc->point_step * cost_grid_pc->width;
  cost_grid_pc->data.resize(cost_grid_pc->row_step * cost_grid_pc->height);
 
  std::vector<sensor_msgs::PointCloud2Iterator<float>> cost_grid_pc_iter;
 
  for (size_t i = 0; i < cost_grid_pc->fields.size(); ++i) {
    sensor_msgs::PointCloud2Iterator<float> iter(*cost_grid_pc, cost_grid_pc->fields[i].name);
    cost_grid_pc_iter.push_back(iter);
  }
 
  unsigned int j = 0;
  for (unsigned int cy = 0; cy < size_y; cy++) {
    for (unsigned int cx = 0; cx < size_x; cx++) {
      costmap->mapToWorld(cx, cy, x_coord, y_coord);
      *cost_grid_pc_iter[0] = x_coord;
      *cost_grid_pc_iter[1] = y_coord;
      *cost_grid_pc_iter[2] = 0.0;   // z value
 
      for (size_t i = 3; i < cost_grid_pc_iter.size(); ++i) {
        *cost_grid_pc_iter[i] = cost_channels[i - 3].second[j];
        ++cost_grid_pc_iter[i];
      }
      ++cost_grid_pc_iter[0];
      ++cost_grid_pc_iter[1];
      ++cost_grid_pc_iter[2];
      j++;
    }
  }
 
  cost_grid_pc_pub_->publish(std::move(cost_grid_pc));
}
 
void
DWBPublisher::publishLocalPlan(const nav_msgs::msg::Path plan)
{
  publishGenericPlan(plan, *local_pub_, publish_local_plan_);
}
 
void
DWBPublisher::publishGenericPlan(
  const nav_msgs::msg::Path plan,
  rclcpp::Publisher<nav_msgs::msg::Path> & pub, bool flag)  //  nosemgrep
{
  if (pub.get_subscription_count() < 1) {return;}
  if (!flag) {return;}
  auto path = std::make_unique<nav_msgs::msg::Path>(plan);
  pub.publish(std::move(path));
}
 
}  // namespace dwb_core