前文 18.如何在實際專案中應用ROS導航相關（1）定點導航使用程式啟動一個pibot_simulator,並且完成一個定點導航，本文對其修改完成一個多點導航航的例子

直接貼出程式碼 navigation_multi_demo.launch

<launch>
    <node pkg="pibot" type="navigation_multi_goals.py" respawn="false" name="navigation_multi_goals" output="screen">
        <param name="goalListX" value="2.0, 1.0" />
        <param name="goalListY" value="2.0, 3.0" />
        <param name="goalListYaw" value="0.0, 90.0" /><!--degree--> 
    </node>
</launch>
 

分別導航至[2.0, 1.0, 0]、[1.0, 3.0, 90]

[x, y ,yaw] x, y為目標座標，yaw為目標姿態yaw(角度)

navigation_multi_goals.py

#!/usr/bin/env python
from launch_demo import launch_demo
import rospy

import actionlib
from actionlib_msgs.msg import *
from move_base_msgs.msg import MoveBaseAction, MoveBaseGoal
from nav_msgs.msg import Path
from geometry_msgs.msg import PoseWithCovarianceStamped
from tf_conversions import transformations
from math import pi

class navigation_demo:
    def __init__(self):
        self.set_pose_pub = rospy.Publisher('/initialpose', PoseWithCovarianceStamped, queue_size=5)

        self.move_base = actionlib.SimpleActionClient("move_base", MoveBaseAction)
        self.move_base.wait_for_server(rospy.Duration(60))

    def set_pose(self, p):
        if self.move_base is None:
            return False

        x, y, th = p

        pose = PoseWithCovarianceStamped()
        pose.header.stamp = rospy.Time.now()
        pose.header.frame_id = 'map'
        pose.pose.pose.position.x = x
        pose.pose.pose.position.y = y
        q = transformations.quaternion_from_euler(0.0, 0.0, th/180.0*pi)
        pose.pose.pose.orientation.x = q[0]
        pose.pose.pose.orientation.y = q[1]
        pose.pose.pose.orientation.z = q[2]
        pose.pose.pose.orientation.w = q[3]

        self.set_pose_pub.publish(pose)
        return True

    def _done_cb(self, status, result):
        rospy.loginfo("navigation done! status:%d result:%s"%(status, result))

    def _active_cb(self):
        rospy.loginfo("[Navi] navigation has be actived")

    def _feedback_cb(self, feedback):
        rospy.loginfo("[Navi] navigation feedback\r\n%s"%feedback)

    def goto(self, p):
        rospy.loginfo("[Navi] goto %s"%p)

        goal = MoveBaseGoal()

        goal.target_pose.header.frame_id = 'map'
        goal.target_pose.header.stamp = rospy.Time.now()
        goal.target_pose.pose.position.x = p[0]
        goal.target_pose.pose.position.y = p[1]
        q = transformations.quaternion_from_euler(0.0, 0.0, p[2]/180.0*pi)
        goal.target_pose.pose.orientation.x = q[0]
        goal.target_pose.pose.orientation.y = q[1]
        goal.target_pose.pose.orientation.z = q[2]
        goal.target_pose.pose.orientation.w = q[3]

        self.move_base.send_goal(goal, self._done_cb, self._active_cb, self._feedback_cb)
        result = self.move_base.wait_for_result(rospy.Duration(60))
        if not result:
            self.move_base.cancel_goal()
            rospy.loginfo("Timed out achieving goal")
        else:
            state = self.move_base.get_state()
            if state == GoalStatus.SUCCEEDED:
                rospy.loginfo("reach goal %s succeeded!"%p)
        return True

    def cancel(self):
        self.move_base.cancel_all_goals()
        return True

if __name__ == "__main__":
    rospy.init_node('navigation_demo',anonymous=True)
    goalListX = rospy.get_param('~goalListX', '2.0, 2.0')
    goalListY = rospy.get_param('~goalListY', '2.0, 4.0')
    goalListYaw = rospy.get_param('~goalListYaw', '0, 90.0')

    goals = [[float(x), float(y), float(yaw)] for (x, y, yaw) in zip(goalListX.split(","),goalListY.split(","),goalListYaw.split(","))]
    navi = navigation_demo()

    r = rospy.Rate(1)
    r.sleep()

    for goal in goals:
        navi.goto(goal)

    while not rospy.is_shutdown():
        r.sleep()