demo_graspEventdetect.py 文件源码

def ik_quaternion(self, quaternion_pose):
        """Take a xyz qxqyqzqw stamped pose and convert it to joint angles
        using IK. You can call self.limb.move_to_joint_positions to
        move to those angles

        """
        node = ("ExternalTools/{}/PositionKinematicsNode/"
                "IKService".format(self.limb_name))
        ik_service = rospy.ServiceProxy(node, SolvePositionIK)
        ik_request = SolvePositionIKRequest()
        ik_request.pose_stamp.append(quaternion_pose)
        try:
            rospy.loginfo('ik: waiting for IK service...')
            rospy.wait_for_service(node, 5.0)
            ik_response = ik_service(ik_request)
        except (rospy.ServiceException, rospy.ROSException) as err:
            rospy.logerr("ik_move: service request failed: %r" % err)
        else:
            if ik_response.isValid[0]:
                rospy.loginfo("ik_move: valid joint configuration found")
                # convert response to joint position control dictionary
                limb_joints = dict(zip(ik_response.joints[0].name,
                                       ik_response.joints[0].position))
                return limb_joints
            else:
                rospy.logerr('ik_move: no valid configuration found')
                return None