test_move.py

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#!/usr/bin/env python
#
# Copyright 2015, 2016 Thomas Timm Andersen (original version)
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

import time
import roslib; roslib.load_manifest('ur_driver')
import rospy
import actionlib
from control_msgs.msg import *
from trajectory_msgs.msg import *
from sensor_msgs.msg import JointState
from math import pi

JOINT_NAMES = ['shoulder_pan_joint', 'shoulder_lift_joint', 'elbow_joint',
               'wrist_1_joint', 'wrist_2_joint', 'wrist_3_joint']
Q1 = [2.2,0,-1.57,0,0,0]
Q2 = [1.5,0,-1.57,0,0,0]
Q3 = [1.5,-0.2,-1.57,0,0,0]
    
client = None

def move1():
    global joints_pos
    g = FollowJointTrajectoryGoal()
    g.trajectory = JointTrajectory()
    g.trajectory.joint_names = JOINT_NAMES
    try:
        joint_states = rospy.wait_for_message("joint_states", JointState)
        joints_pos = joint_states.position
        g.trajectory.points = [
            JointTrajectoryPoint(positions=joints_pos, velocities=[0]*6, time_from_start=rospy.Duration(0.0)),
            JointTrajectoryPoint(positions=Q1, velocities=[0]*6, time_from_start=rospy.Duration(2.0)),
            JointTrajectoryPoint(positions=Q2, velocities=[0]*6, time_from_start=rospy.Duration(3.0)),
            JointTrajectoryPoint(positions=Q3, velocities=[0]*6, time_from_start=rospy.Duration(4.0))]
        client.send_goal(g)
        client.wait_for_result()
    except KeyboardInterrupt:
        client.cancel_goal()
        raise
    except:
        raise

def move_disordered():
    order = [4, 2, 3, 1, 5, 0]
    g = FollowJointTrajectoryGoal()
    g.trajectory = JointTrajectory()
    g.trajectory.joint_names = [JOINT_NAMES[i] for i in order]
    q1 = [Q1[i] for i in order]
    q2 = [Q2[i] for i in order]
    q3 = [Q3[i] for i in order]
    try:
        joint_states = rospy.wait_for_message("joint_states", JointState)
        joints_pos = joint_states.position
        g.trajectory.points = [
            JointTrajectoryPoint(positions=joints_pos, velocities=[0]*6, time_from_start=rospy.Duration(0.0)),
            JointTrajectoryPoint(positions=q1, velocities=[0]*6, time_from_start=rospy.Duration(2.0)),
            JointTrajectoryPoint(positions=q2, velocities=[0]*6, time_from_start=rospy.Duration(3.0)),
            JointTrajectoryPoint(positions=q3, velocities=[0]*6, time_from_start=rospy.Duration(4.0))]
        client.send_goal(g)
        client.wait_for_result()
    except KeyboardInterrupt:
        client.cancel_goal()
        raise
    except:
        raise
    
def move_repeated():
    g = FollowJointTrajectoryGoal()
    g.trajectory = JointTrajectory()
    g.trajectory.joint_names = JOINT_NAMES
    try:
        joint_states = rospy.wait_for_message("joint_states", JointState)
        joints_pos = joint_states.position
        d = 2.0
        g.trajectory.points = [JointTrajectoryPoint(positions=joints_pos, velocities=[0]*6, time_from_start=rospy.Duration(0.0))]
        for i in range(10):
            g.trajectory.points.append(
                JointTrajectoryPoint(positions=Q1, velocities=[0]*6, time_from_start=rospy.Duration(d)))
            d += 1
            g.trajectory.points.append(
                JointTrajectoryPoint(positions=Q2, velocities=[0]*6, time_from_start=rospy.Duration(d)))
            d += 1
            g.trajectory.points.append(
                JointTrajectoryPoint(positions=Q3, velocities=[0]*6, time_from_start=rospy.Duration(d)))
            d += 2
        client.send_goal(g)
        client.wait_for_result()
    except KeyboardInterrupt:
        client.cancel_goal()
        raise
    except:
        raise

def move_interrupt():
    g = FollowJointTrajectoryGoal()
    g.trajectory = JointTrajectory()
    g.trajectory.joint_names = JOINT_NAMES
    try:
        joint_states = rospy.wait_for_message("joint_states", JointState)
        joints_pos = joint_states.position
        g.trajectory.points = [
            JointTrajectoryPoint(positions=joints_pos, velocities=[0]*6, time_from_start=rospy.Duration(0.0)),
            JointTrajectoryPoint(positions=Q1, velocities=[0]*6, time_from_start=rospy.Duration(2.0)),
            JointTrajectoryPoint(positions=Q2, velocities=[0]*6, time_from_start=rospy.Duration(3.0)),
            JointTrajectoryPoint(positions=Q3, velocities=[0]*6, time_from_start=rospy.Duration(4.0))]
    
        client.send_goal(g)
        time.sleep(3.0)
        print "Interrupting"
        joint_states = rospy.wait_for_message("joint_states", JointState)
        joints_pos = joint_states.position
        g.trajectory.points = [
            JointTrajectoryPoint(positions=joints_pos, velocities=[0]*6, time_from_start=rospy.Duration(0.0)),
            JointTrajectoryPoint(positions=Q1, velocities=[0]*6, time_from_start=rospy.Duration(2.0)),
            JointTrajectoryPoint(positions=Q2, velocities=[0]*6, time_from_start=rospy.Duration(3.0)),
            JointTrajectoryPoint(positions=Q3, velocities=[0]*6, time_from_start=rospy.Duration(4.0))]
        client.send_goal(g)
        client.wait_for_result()
    except KeyboardInterrupt:
        client.cancel_goal()
        raise
    except:
        raise
   
def main():
    global client
    try:
        rospy.init_node("test_move", anonymous=True, disable_signals=True)
        client = actionlib.SimpleActionClient('follow_joint_trajectory', FollowJointTrajectoryAction)
        print "Waiting for server..."
        client.wait_for_server()
        print "Connected to server"
        parameters = rospy.get_param(None)
        index = str(parameters).find('prefix')
        if (index > 0):
            prefix = str(parameters)[index+len("prefix': '"):(index+len("prefix': '")+str(parameters)[index+len("prefix': '"):-1].find("'"))]
            for i, name in enumerate(JOINT_NAMES):
                JOINT_NAMES[i] = prefix + name
        print "This program makes the robot move between the following three poses:"
        print str([Q1[i]*180./pi for i in xrange(0,6)])
        print str([Q2[i]*180./pi for i in xrange(0,6)])
        print str([Q3[i]*180./pi for i in xrange(0,6)])
        print "Please make sure that your robot can move freely between these poses before proceeding!"
        inp = raw_input("Continue? y/n: ")[0]
        if (inp == 'y'):
            #move1()
            move_repeated()
            #move_disordered()
            #move_interrupt()
        else:
            print "Halting program"
    except KeyboardInterrupt:
        rospy.signal_shutdown("KeyboardInterrupt")
        raise

if __name__ == '__main__': main()