odometry_helper_ros.cpp

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#include <base_local_planner/odometry_helper_ros.h>
#include <tf2/LinearMath/Quaternion.h>
#include <tf2_geometry_msgs/tf2_geometry_msgs.h>
#include <tf2/convert.h>
 
namespace base_local_planner {
 
OdometryHelperRos::OdometryHelperRos(std::string odom_topic) {
  setOdomTopic( odom_topic );
}
 
void OdometryHelperRos::odomCallback(const nav_msgs::Odometry::ConstPtr& msg) {
    ROS_INFO_ONCE("odom received!");
 
  //we assume that the odometry is published in the frame of the base
  boost::mutex::scoped_lock lock(odom_mutex_);
  base_odom_.twist.twist.linear.x = msg->twist.twist.linear.x;
  base_odom_.twist.twist.linear.y = msg->twist.twist.linear.y;
  base_odom_.twist.twist.angular.z = msg->twist.twist.angular.z;
  base_odom_.child_frame_id = msg->child_frame_id;
//  ROS_DEBUG_NAMED("dwa_local_planner", "In the odometry callback with velocity values: (%.2f, %.2f, %.2f)",
//      base_odom_.twist.twist.linear.x, base_odom_.twist.twist.linear.y, base_odom_.twist.twist.angular.z);
}
 
//copy over the odometry information
void OdometryHelperRos::getOdom(nav_msgs::Odometry& base_odom) {
  boost::mutex::scoped_lock lock(odom_mutex_);
  base_odom = base_odom_;
}
 
 
void OdometryHelperRos::getRobotVel(geometry_msgs::PoseStamped& robot_vel) {
  // Set current velocities from odometry
  geometry_msgs::Twist global_vel;
  {
    boost::mutex::scoped_lock lock(odom_mutex_);
    global_vel.linear.x = base_odom_.twist.twist.linear.x;
    global_vel.linear.y = base_odom_.twist.twist.linear.y;
    global_vel.angular.z = base_odom_.twist.twist.angular.z;
 
    robot_vel.header.frame_id = base_odom_.child_frame_id;
  }
  robot_vel.pose.position.x = global_vel.linear.x;
  robot_vel.pose.position.y = global_vel.linear.y;
  robot_vel.pose.position.z = 0;
  tf2::Quaternion q;
  q.setRPY(0, 0, global_vel.angular.z);
  tf2::convert(q, robot_vel.pose.orientation);
  robot_vel.header.stamp = ros::Time();
}
 
void OdometryHelperRos::setOdomTopic(std::string odom_topic)
{
  if( odom_topic != odom_topic_ )
  {
    odom_topic_ = odom_topic;
 
    if( odom_topic_ != "" )
    {
      ros::NodeHandle gn;
      odom_sub_ = gn.subscribe<nav_msgs::Odometry>( odom_topic_, 1, [this](auto& msg){ odomCallback(msg); });
    }
    else
    {
      odom_sub_.shutdown();
    }
  }
}
 
} /* namespace base_local_planner */