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test_gripper_joint_trajectory.cpp

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/*
 * UOS-ROS packages - Robot Operating System code by the University of Osnabrück
 * Copyright (C) 2011  University of Osnabrück
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 *
 * test_gripper_joint_trajectory.cpp
 *
 *  Created on: 24.10.2011
 *      Author: Karl Glatz <glatz@hs-weingarten.de>
 *              Ravensburg-Weingarten, University of Applied Sciences
 *
 *    based on: min_max_trajectory.cpp
 */
#include <ros/ros.h>
#include <pr2_controllers_msgs/JointTrajectoryAction.h>
#include <actionlib/client/simple_action_client.h>
#include <sensor_msgs/JointState.h>

typedef actionlib::SimpleActionClient<pr2_controllers_msgs::JointTrajectoryAction> TrajClient;

static const double GRIPPER_OPEN_ANGLE = 0.30;

static const double GRIPPER_CLOSED_ANGLE = -0.44;

//static const double DEFAULT_GRIPPER_OBJECT_PRESENCE_THRESHOLD = -0.43;

//static const double GRIPPER_OPENING_CLOSING_DURATION = 6.0;

class TestGripperJointTrajectory
{
private:
  // Action client for the joint trajectory action
  // used to trigger the arm movement action
  TrajClient* traj_client_;

  ros::NodeHandle nh_;

  ros::Subscriber joint_state_sub_;
  std::vector<std::string> joint_names_;
  bool got_joint_state_;
  std::vector<double> current_joint_state_;
  ros::AsyncSpinner spinner_;


  void jointStateCB(const sensor_msgs::JointState::ConstPtr &msg)
  {
    std::vector<double> ordered_js;

    ordered_js.resize(joint_names_.size());

    for (size_t i = 0; i < joint_names_.size(); ++i)
    {
      bool found = false;
      for (size_t j = 0; j < msg->name.size(); ++j)
      {
        if (joint_names_[i] == msg->name[j])
        {
          ordered_js[i] = msg->position[j];
          found = true;
          break;
        }
      }
      if (!found)
        return;
    }

    ROS_INFO_ONCE("Got joint state!");
    current_joint_state_ = ordered_js;
    got_joint_state_ = true;
  }

public:
  TestGripperJointTrajectory() :
    got_joint_state_(false), spinner_(1)
  {
    joint_names_.push_back("katana_l_finger_joint");
    joint_names_.push_back("katana_r_finger_joint");

    joint_state_sub_ = nh_.subscribe("/joint_states", 1, &TestGripperJointTrajectory::jointStateCB, this);
    spinner_.start();

    // tell the action client that we want to spin a thread by default
    traj_client_ = new TrajClient("katana_arm_controller/gripper_joint_trajectory_action", true);

    // wait for action server to come up
    while (!traj_client_->waitForServer(ros::Duration(5.0)) && ros::ok())
    {
      ROS_INFO("Waiting for the joint_trajectory_action server");
    }

    ROS_INFO("The joint_trajectory_action server is available");

  }

  ~TestGripperJointTrajectory()
  {
    delete traj_client_;
  }

  void startTrajectory(pr2_controllers_msgs::JointTrajectoryGoal goal)
  {
    // When to start the trajectory: 1s from now
    goal.trajectory.header.stamp = ros::Time::now() + ros::Duration(1.0);
    traj_client_->sendGoal(goal);
  }

  pr2_controllers_msgs::JointTrajectoryGoal closeGoal()
  {
    pr2_controllers_msgs::JointTrajectoryGoal goal;

    // set up the joint names
    goal.trajectory.joint_names = joint_names_;

    // set some values

    // num of points
    goal.trajectory.points.resize(2);

    // number of joints in each point
    goal.trajectory.points[0].positions.resize(2);
    goal.trajectory.points[0].velocities.resize(2);

    goal.trajectory.points[0].positions[0] = current_joint_state_[0];
    goal.trajectory.points[0].velocities[0] = 0.0;

    goal.trajectory.points[0].positions[1] = current_joint_state_[1];
    goal.trajectory.points[0].velocities[1] = 0.0;

    goal.trajectory.points[0].time_from_start = ros::Duration(0.0);

    // close

    // number of joints in each point
    goal.trajectory.points[1].positions.resize(2);
    goal.trajectory.points[1].velocities.resize(2);

    goal.trajectory.points[1].positions[0] = GRIPPER_CLOSED_ANGLE;
    goal.trajectory.points[1].velocities[0] = 0.0;

    goal.trajectory.points[1].positions[1] = GRIPPER_CLOSED_ANGLE;
    goal.trajectory.points[1].velocities[1] = 0.0;

    goal.trajectory.points[1].time_from_start = ros::Duration(3.0);


    return goal;
  }

  pr2_controllers_msgs::JointTrajectoryGoal openGoal()
  {
    pr2_controllers_msgs::JointTrajectoryGoal goal;

    // set up the joint names
    goal.trajectory.joint_names = joint_names_;

    // set some values

    // num of points
    goal.trajectory.points.resize(2);

    // number of joints in each point
    goal.trajectory.points[0].positions.resize(2);
    goal.trajectory.points[0].velocities.resize(2);

    goal.trajectory.points[0].positions[0] = current_joint_state_[0];
    goal.trajectory.points[0].velocities[0] = 0.0;

    goal.trajectory.points[0].positions[1] = current_joint_state_[1];
    goal.trajectory.points[0].velocities[1] = 0.0;

    goal.trajectory.points[0].time_from_start = ros::Duration(0.0);

    // close

    // number of joints in each point
    goal.trajectory.points[1].positions.resize(2);
    goal.trajectory.points[1].velocities.resize(2);

    goal.trajectory.points[1].positions[0] = GRIPPER_OPEN_ANGLE;
    goal.trajectory.points[1].velocities[0] = 0.0;

    goal.trajectory.points[1].positions[1] = GRIPPER_OPEN_ANGLE;
    goal.trajectory.points[1].velocities[1] = 0.0;

    goal.trajectory.points[1].time_from_start = ros::Duration(3.0);

    return goal;
  }

  actionlib::SimpleClientGoalState getState()
  {
    return traj_client_->getState();
  }

};

int main(int argc, char** argv)
{

  // Init the ROS node
  ros::init(argc, argv, "test_gripper_joint_trajectory");

  TestGripperJointTrajectory test;

  ROS_INFO("Start, press CRTL+C to stop!");
  while (ros::ok())
  {

    ROS_INFO("Send closeGoal");
    test.startTrajectory(test.closeGoal());
    while (!test.getState().isDone() && ros::ok())
    {
      usleep(50000);
    }

    ROS_INFO("closeGoal %s", test.getState().toString().c_str());

    usleep(1000000); // 1 sec

    ROS_INFO("Send openGoal");
    test.startTrajectory(test.openGoal());
    while (!test.getState().isDone() && ros::ok())
    {
      usleep(50000);
    }

    ROS_INFO("openGoal %s", test.getState().toString().c_str());

    usleep(1000000); // 1 sec

  }

  return 0;

}

---

katana_gazebo_plugins
Author(s): Martin Günther
autogenerated on Tue Mar 5 12:31:12 2013