pose_tracking_example.cpp

Go to the documentation of this file.

/*******************************************************************************
 *      Title     : pose_tracking_example.cpp
 *      Project   : moveit_servo
 *      Created   : 09/04/2020
 *      Author    : Adam Pettinger
 *
 * BSD 3-Clause License
 *
 * Copyright (c) 2019, Los Alamos National Security, LLC
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * * Redistributions of source code must retain the above copyright notice, this
 *   list of conditions and the following disclaimer.
 *
 * * Redistributions in binary form must reproduce the above copyright notice,
 *   this list of conditions and the following disclaimer in the documentation
 *   and/or other materials provided with the distribution.
 *
 * * Neither the name of the copyright holder nor the names of its
 *   contributors may be used to endorse or promote products derived from
 *   this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *******************************************************************************/
 
#include <std_msgs/Int8.h>
#include <geometry_msgs/TransformStamped.h>
 
#include <moveit_servo/servo.h>
#include <moveit_servo/pose_tracking.h>
#include <moveit_servo/status_codes.h>
#include <moveit_servo/make_shared_from_pool.h>
#include <thread>
 
static const std::string LOGNAME = "cpp_interface_example";
 
// Class for monitoring status of moveit_servo
class StatusMonitor
{
public:
  StatusMonitor(ros::NodeHandle& nh, const std::string& topic)
  {
    sub_ = nh.subscribe(topic, 1, &StatusMonitor::statusCB, this);
  }
 
private:
  void statusCB(const std_msgs::Int8ConstPtr& msg)
  {
    moveit_servo::StatusCode latest_status = static_cast<moveit_servo::StatusCode>(msg->data);
    if (latest_status != status_)
    {
      status_ = latest_status;
      const auto& status_str = moveit_servo::SERVO_STATUS_CODE_MAP.at(status_);
      ROS_INFO_STREAM_NAMED(LOGNAME, "Servo status: " << status_str);
    }
  }
  moveit_servo::StatusCode status_ = moveit_servo::StatusCode::INVALID;
  ros::Subscriber sub_;
};
 
int main(int argc, char** argv)
{
  ros::init(argc, argv, LOGNAME);
  ros::NodeHandle nh("~");
  ros::AsyncSpinner spinner(8);
  spinner.start();
 
  // Load the planning scene monitor
  planning_scene_monitor::PlanningSceneMonitorPtr planning_scene_monitor;
  planning_scene_monitor = std::make_shared<planning_scene_monitor::PlanningSceneMonitor>("robot_description");
  if (!planning_scene_monitor->getPlanningScene())
  {
    ROS_ERROR_STREAM_NAMED(LOGNAME, "Error in setting up the PlanningSceneMonitor.");
    exit(EXIT_FAILURE);
  }
 
  planning_scene_monitor->startSceneMonitor();
  planning_scene_monitor->startWorldGeometryMonitor(
      planning_scene_monitor::PlanningSceneMonitor::DEFAULT_COLLISION_OBJECT_TOPIC,
      planning_scene_monitor::PlanningSceneMonitor::DEFAULT_PLANNING_SCENE_WORLD_TOPIC,
      false /* skip octomap monitor */);
  planning_scene_monitor->startStateMonitor();
 
  // Create the pose tracker
  moveit_servo::PoseTracking tracker(nh, planning_scene_monitor);
 
  // Make a publisher for sending pose commands
  ros::Publisher target_pose_pub =
      nh.advertise<geometry_msgs::PoseStamped>("target_pose", 1 /* queue */, true /* latch */);
 
  // Subscribe to servo status (and log it when it changes)
  StatusMonitor status_monitor(nh, "status");
 
  Eigen::Vector3d lin_tol{ 0.01, 0.01, 0.01 };
  double rot_tol = 0.1;
 
  // Get the current EE transform
  geometry_msgs::TransformStamped current_ee_tf;
  tracker.getCommandFrameTransform(current_ee_tf);
 
  // Convert it to a Pose
  geometry_msgs::PoseStamped target_pose;
  target_pose.header.frame_id = current_ee_tf.header.frame_id;
  target_pose.pose.position.x = current_ee_tf.transform.translation.x;
  target_pose.pose.position.y = current_ee_tf.transform.translation.y;
  target_pose.pose.position.z = current_ee_tf.transform.translation.z;
  target_pose.pose.orientation = current_ee_tf.transform.rotation;
 
  // Modify it a little bit
  target_pose.pose.position.x += 0.1;
 
  // resetTargetPose() can be used to clear the target pose and wait for a new one, e.g. when moving between multiple
  // waypoints
  tracker.resetTargetPose();
 
  // Publish target pose
  target_pose.header.stamp = ros::Time::now();
  target_pose_pub.publish(target_pose);
 
  // Run the pose tracking in a new thread
  std::thread move_to_pose_thread(
      [&tracker, &lin_tol, &rot_tol] { tracker.moveToPose(lin_tol, rot_tol, 0.1 /* target pose timeout */); });
 
  ros::Rate loop_rate(50);
  for (size_t i = 0; i < 500; ++i)
  {
    // Modify the pose target a little bit each cycle
    // This is a dynamic pose target
    target_pose.pose.position.z += 0.0004;
    target_pose.header.stamp = ros::Time::now();
    target_pose_pub.publish(target_pose);
 
    loop_rate.sleep();
  }
 
  // Make sure the tracker is stopped and clean up
  tracker.stopMotion();
  move_to_pose_thread.join();
 
  return EXIT_SUCCESS;
}