python_move_group.py

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#!/usr/bin/env python
 
import unittest
import numpy as np
import rospy
import rostest
import os
 
from moveit_ros_planning_interface._moveit_move_group_interface import (
    MoveGroupInterface,
)
from moveit_msgs.msg import MoveItErrorCodes
 
 
class PythonMoveGroupTest(unittest.TestCase):
    PLANNING_GROUP = "manipulator"
 
    @classmethod
    def setUpClass(self):
        self.group = MoveGroupInterface(
            self.PLANNING_GROUP, "robot_description", rospy.get_namespace()
        )
 
    @classmethod
    def tearDown(self):
        pass
 
    def check_target_setting(self, expect, *args):
        if len(args) == 0:
            args = [expect]
        self.group.set_joint_value_target(*args)
        res = self.group.get_joint_value_target()
        self.assertTrue(
            np.all(np.asarray(res) == np.asarray(expect)),
            "Setting failed for %s, values: %s" % (type(args[0]), res),
        )
 
    def test_target_setting(self):
        n = self.group.get_variable_count()
        self.check_target_setting([0.1] * n)
        self.check_target_setting((0.2,) * n)
        self.check_target_setting(np.zeros(n))
        self.check_target_setting(
            [0.3] * n, {name: 0.3 for name in self.group.get_active_joints()}
        )
        self.check_target_setting([0.5] + [0.3] * (n - 1), "joint_1", 0.5)
 
    def plan(self, target):
        self.group.set_joint_value_target(target)
        return self.group.plan()
 
    def test_validation(self):
        current = np.asarray(self.group.get_current_joint_values())
 
        error_code1, plan1, time = self.plan(current + 0.2)
        error_code2, plan2, time = self.plan(current + 0.2)
 
        # both plans should have succeeded:
        error_code = MoveItErrorCodes()
        error_code.deserialize(error_code1)
        self.assertEqual(error_code.val, MoveItErrorCodes.SUCCESS)
        error_code = MoveItErrorCodes()
        error_code.deserialize(error_code2)
        self.assertEqual(error_code.val, MoveItErrorCodes.SUCCESS)
 
        # first plan should execute
        self.assertTrue(self.group.execute(plan1))
 
        # second plan should be invalid now (due to modified start point) and rejected
        self.assertFalse(self.group.execute(plan2))
 
        # newly planned trajectory should execute again
        error_code3, plan3, time = self.plan(current)
        error_code = MoveItErrorCodes()
        error_code.deserialize(error_code3)
        self.assertEqual(error_code.val, MoveItErrorCodes.SUCCESS)
        self.assertTrue(self.group.execute(plan3))
 
    def test_get_jacobian_matrix(self):
        current = self.group.get_current_joint_values()
        result = self.group.get_jacobian_matrix(current)
        # Value check by known value at the initial pose
        expected = np.array(
            [
                [0.0, 0.8, -0.2, 0.0, 0.0, 0.0],
                [0.89, 0.0, 0.0, 0.0, 0.0, 0.0],
                [0.0, -0.74, 0.74, 0.0, 0.1, 0.0],
                [0.0, 0.0, 0.0, -1.0, 0.0, -1.0],
                [0.0, 1.0, -1.0, 0.0, -1.0, 0.0],
                [1.0, 0.0, 0.0, 0.0, 0.0, 0.0],
            ]
        )
        self.assertTrue(np.allclose(result, expected))
 
        result = self.group.get_jacobian_matrix(current, [1.0, 1.0, 1.0])
        expected = np.array(
            [
                [1.0, 1.8, -1.2, 0.0, -1.0, 0.0],
                [1.89, 0.0, 0.0, 1.0, 0.0, 1.0],
                [0.0, -1.74, 1.74, 1.0, 1.1, 1.0],
                [0.0, 0.0, 0.0, -1.0, 0.0, -1.0],
                [0.0, 1.0, -1.0, 0.0, -1.0, 0.0],
                [1.0, 0.0, 0.0, 0.0, 0.0, 0.0],
            ]
        )
 
 
if __name__ == "__main__":
    PKGNAME = "moveit_ros_planning_interface"
    NODENAME = "moveit_test_python_move_group"
    rospy.init_node(NODENAME)
    rostest.rosrun(PKGNAME, NODENAME, PythonMoveGroupTest)