publishers.cpp

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#include <locomotor/publishers.h>
#include <nav_2d_utils/path_ops.h>
#include <nav_2d_utils/conversions.h>
#include <nav_msgs/Path.h>
#include <geometry_msgs/Twist.h>
#include <string>
 
namespace locomotor
{
PathPublisher::PathPublisher(ros::NodeHandle& nh)
{
  std::string topic, publish_type;
  nh.param("global_plan_topic", topic, std::string("global_plan"));
  nh.param("global_plan_type", publish_type, std::string("Path3D"));
  nh.param("global_plan_epsilon", global_plan_epsilon_, 0.1);
 
  if (publish_type == "Path2D")
  {
    path_type_ = PathType::PATH_2D;
    pub_ = nh.advertise<nav_2d_msgs::Path2D>(topic, 1);
  }
  else if (publish_type == "")
  {
    path_type_ = PathType::NO_PATH;
  }
  else
  {
    if (publish_type != "Path3D")
    {
      ROS_ERROR_NAMED("Locomotor", "Unknown global_plan_type \"%s\". Using Path3D instead.", publish_type.c_str());
    }
    path_type_ = PathType::PATH_3D;
    pub_ = nh.advertise<nav_msgs::Path>(topic, 1);
  }
}
 
void PathPublisher::publishPath(const nav_2d_msgs::Path2D& global_plan)
{
  if (pub_.getNumSubscribers() == 0) return;
 
  nav_2d_msgs::Path2D to_publish = global_plan;
  if (global_plan_epsilon_ >= 0.0)
  {
    to_publish = nav_2d_utils::compressPlan(global_plan, global_plan_epsilon_);
  }
  switch (path_type_)
  {
  case PathType::PATH_2D:
    pub_.publish(to_publish);
    break;
  case PathType::PATH_3D:
    pub_.publish(nav_2d_utils::pathToPath(to_publish));
    break;
  case PathType::NO_PATH:
    break;
  };
}
 
TwistPublisher::TwistPublisher(ros::NodeHandle& nh)
{
  std::string topic, publish_type;
  nh.param("twist_topic", topic, std::string("cmd_vel"));
  nh.param("twist_type", publish_type, std::string("Twist3D"));
 
  ros::NodeHandle global_nh;
  if (publish_type == "Twist2D")
  {
    twist_type_ = TwistType::TWIST_2D;
    pub_ = global_nh.advertise<nav_2d_msgs::Twist2D>(topic, 1);
  }
  else if (publish_type == "Twist2DStamped")
  {
    twist_type_ = TwistType::TWIST_2D_STAMPED;
    pub_ = global_nh.advertise<nav_2d_msgs::Twist2DStamped>(topic, 1);
  }
  else if (publish_type == "")
  {
    twist_type_ = TwistType::NO_TWIST;
  }
  else
  {
    if (publish_type != "Twist3D")
    {
      ROS_ERROR_NAMED("Locomotor", "Unknown twist_type \"%s\". Using Twist3D instead.", publish_type.c_str());
    }
    twist_type_ = TwistType::TWIST_3D;
    pub_ = global_nh.advertise<geometry_msgs::Twist>(topic, 1);
  }
}
 
void TwistPublisher::publishTwist(const nav_2d_msgs::Twist2DStamped& command)
{
  if (pub_.getNumSubscribers() == 0) return;
  switch (twist_type_)
  {
  case TwistType::TWIST_2D:
    pub_.publish(command.velocity);
    break;
  case TwistType::TWIST_2D_STAMPED:
    pub_.publish(command);
    break;
  case TwistType::TWIST_3D:
    pub_.publish(nav_2d_utils::twist2Dto3D(command.velocity));
    break;
  case TwistType::NO_TWIST:
    break;
  };
}
 
}  // namespace locomotor