get_pose_helper.hpp

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/*
 * snap_utils
 * Copyright (c) 2019, Samsung Research America
 *
 * THE WORK (AS DEFINED BELOW) IS PROVIDED UNDER THE TERMS OF THIS CREATIVE
 * COMMONS PUBLIC LICENSE ("CCPL" OR "LICENSE"). THE WORK IS PROTECTED BY
 * COPYRIGHT AND/OR OTHER APPLICABLE LAW. ANY USE OF THE WORK OTHER THAN AS
 * AUTHORIZED UNDER THIS LICENSE OR COPYRIGHT LAW IS PROHIBITED.
 *
 * BY EXERCISING ANY RIGHTS TO THE WORK PROVIDED HERE, YOU ACCEPT AND AGREE TO
 * BE BOUND BY THE TERMS OF THIS LICENSE. THE LICENSOR GRANTS YOU THE RIGHTS
 * CONTAINED HERE IN CONSIDERATION OF YOUR ACCEPTANCE OF SUCH TERMS AND
 * CONDITIONS.
 *
 */
 
/* Author: Steven Macenski */
 
#ifndef SLAM_TOOLBOX_POSE_UTILS_H_
#define SLAM_TOOLBOX_POSE_UTILS_H_
 
#include <geometry_msgs/PoseWithCovarianceStamped.h>
#include "slam_toolbox/toolbox_types.hpp"
#include "karto_sdk/Mapper.h"
 
namespace pose_utils
{
 
// helper to get the robots position
class GetPoseHelper
{
public:
  GetPoseHelper(tf2_ros::Buffer* tf,
    const std::string& base_frame,
    const std::string& odom_frame)
  : tf_(tf), base_frame_(base_frame), odom_frame_(odom_frame)
  {
  };
 
  bool getOdomPose(karto::Pose2& karto_pose, const ros::Time& t)
  {
    geometry_msgs::TransformStamped base_ident, odom_pose;
    base_ident.header.stamp = t;
    base_ident.header.frame_id = base_frame_;
    base_ident.transform.rotation.w = 1.0;
 
    try
    {
      odom_pose = tf_->transform(base_ident, odom_frame_);
    }
    catch(tf2::TransformException e)
    {
      ROS_WARN("Failed to compute odom pose, skipping scan (%s)", e.what());
      return false;
    }
 
    const double yaw = tf2::getYaw(odom_pose.transform.rotation);
    karto_pose = karto::Pose2(odom_pose.transform.translation.x,
      odom_pose.transform.translation.y, yaw);
 
    return true;
  };
 
private:
  tf2_ros::Buffer* tf_;
  std::string base_frame_, odom_frame_;
};
 
} // end namespace
 
#endif //SLAM_TOOLBOX_POSE_UTILS_H_