python_time_parameterization.py

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#!/usr/bin/env python
 
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# Author: Masaki Murooka (JSK Robotics Lab, The University of Tokyo)
 
import unittest
import numpy as np
import rospy
import rostest
import os
 
from moveit_commander import RobotCommander
 
 
class PythonTimeParameterizationTest(unittest.TestCase):
    PLANNING_GROUP = "manipulator"
 
    @classmethod
    def setUpClass(self):
        self.commandercommander = RobotCommander("robot_description")
        self.groupgroup = self.commandercommander.get_group(self.PLANNING_GROUPPLANNING_GROUP)
 
    @classmethod
    def tearDown(self):
        pass
 
    def plan(self):
        start_pose = self.group.get_current_pose().pose
        goal_pose = self.group.get_current_pose().pose
        goal_pose.position.z -= 0.1
        (plan, fraction) = self.group.compute_cartesian_path(
            [start_pose, goal_pose], 0.005, 0.0
        )
        self.assertEqual(fraction, 1.0, "Cartesian path plan failed")
        return plan
 
    def time_parameterization(self, plan, algorithm):
        ref_state = self.commandercommander.get_current_state()
        retimed_plan = self.groupgroup.retime_trajectory(
            ref_state,
            plan,
            velocity_scaling_factor=0.1,
            acceleration_scaling_factor=0.1,
            algorithm=algorithm,
        )
        return retimed_plan
 
    def test_plan_and_time_parameterization(self):
        plan = self.planplan()
        retimed_plan = self.time_parameterizationtime_parameterization(
            plan, "iterative_time_parameterization"
        )
        self.assertTrue(
            len(retimed_plan.joint_trajectory.points) > 0, "Retimed plan is invalid"
        )
        retimed_plan = self.time_parameterizationtime_parameterization(
            plan, "iterative_spline_parameterization"
        )
        self.assertTrue(
            len(retimed_plan.joint_trajectory.points) > 0, "Retimed plan is invalid"
        )
        retimed_plan = self.time_parameterizationtime_parameterization(
            plan, "time_optimal_trajectory_generation"
        )
        self.assertTrue(
            len(retimed_plan.joint_trajectory.points) > 0, "Retimed plan is invalid"
        )
        retimed_plan = self.time_parameterizationtime_parameterization(plan, "")
        self.assertTrue(
            len(retimed_plan.joint_trajectory.points) == 0, "Invalid retime algorithm"
        )
 
 
if __name__ == "__main__":
    PKGNAME = "moveit_ros_planning_interface"
    NODENAME = "moveit_test_python_time_parameterization"
    rospy.init_node(NODENAME)
    rostest.rosrun(PKGNAME, NODENAME, PythonTimeParameterizationTest)
 
    # suppress cleanup segfault
    os._exit(0)