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tb3_3
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#!/usr/bin/env python
#################################################################################
# Copyright 2018 IWIN, SJTU
#
# https://iwin-fins.com
#################################################################################
# Authors: Hongbo Li, Han Wang#
import rospy
from geometry_msgs.msg import Twist, Point, Quaternion
import tf
from math import radians, copysign, sqrt, pow, pi, atan2,cos,sin
from tf.transformations import euler_from_quaternion
import numpy as np
msg = """
this is tb3_3
"""
tb3_0_pos=Point()
tb3_1_pos=Point()
tb3_2_pos=Point()
tb3_3_pos=Point()
tb3_4_pos=Point()
tb3_4_vel=Twist()
tb3_3_vel=Twist()
K1=0.2
K2=0.1
K3=1
alpha=0
detect_R=1
safe_r=0.3
ID=3
class GotoPoint():
def __init__(self):
rospy.init_node('tb3_3', anonymous=False)
#turtlebot3_model = rospy.get_param("model")
# rospy.on_shutdown(self.shutdown)
self.cmd_vel = rospy.Publisher('cmd_vel', Twist, queue_size=5)
self.tb3_3_positon=rospy.Publisher('/tb3_3_pos',Point,queue_size=5)
position = Point()
move_cmd = Twist()
r = rospy.Rate(10)
self.tf_listener = tf.TransformListener()
self.odom_frame = '/tb3_3/odom'
try:
self.tf_listener.waitForTransform(self.odom_frame, '/tb3_3/base_footprint', rospy.Time(), rospy.Duration(1.0))
self.base_frame = '/tb3_3/base_footprint'
except (tf.Exception, tf.ConnectivityException, tf.LookupException):
try:
self.tf_listener.waitForTransform(self.odom_frame, '/tb3_3/base_link', rospy.Time(), rospy.Duration(1.0))
self.base_frame = '/tb3_3/base_link'
except (tf.Exception, tf.ConnectivityException, tf.LookupException):
rospy.loginfo("Cannot find transform between odom and base_link or base_footprint")
rospy.signal_shutdown("tf Exception")
(position, rotation) = self.get_odom()
rospy.Subscriber('/tb3_2_pos',Point,point_callback_2)
rospy.Subscriber('/tb3_4_pos',Point,point_callback_4)
rospy.Subscriber('/tb3_4_vel',Twist,vel_callback_4)
self.tb3_3_positon.publish(position)
global tb3_0_pos
global tb3_1_pos
global tb3_2_pos
global tb3_3_pos
global tb3_4_pos
global tb3_3_vel
tb3_3_vel_delta_x=((tb3_2_pos.x-position.x)+(tb3_4_pos.x-position.x-2))
tb3_3_vel_delta_y=((tb3_2_pos.y-position.y-4)+(tb3_4_pos.y-position.y-2))
if abs(tb3_3_vel_delta_x)<0.05:
tb3_3_vel_delta_x=0
if abs(tb3_3_vel_delta_y)<0.05:
tb3_3_vel_delta_y=0
goal_x=tb3_3_vel_delta_x+position.x
goal_y=tb3_3_vel_delta_y+position.y
goal_z=atan2(tb3_3_vel_delta_y,tb3_3_vel_delta_x)
# print tb3_3_vel_delta_x;print tb3_3_vel_delta_y
if tb3_3_vel_delta_x==0 and tb3_3_vel_delta_y==0:
goal_z=0
global tb3_4_vel
angular_now=rotation
phi=goal_z
avoid_delta=0
tb3_3_pos=position
pos_nodes=[tb3_0_pos,tb3_1_pos,tb3_2_pos,tb3_3_pos,tb3_4_pos]
temp_x_sum=0
temp_y_sum=0
for i in range(len(pos_nodes)):
print i
if i!=ID:
print i
print pos_nodes[i].x
r=sqrt(pow(pos_nodes[i].x-pos_nodes[ID].x,2)+pow(pos_nodes[i].y-pos_nodes[ID].y,2))
print ('distance between %d is %f'%(i,r))
if r>safe_r and r<detect_R:
# temp_x=(pow(detect_R,2)-pow(safe_r,2))*(pos_nodes[i].x-pos_nodes[ID].x)
# temp_y=(pow(detect_R,2)-pow(safe_r,2))*(pos_nodes[i].y-pos_nodes[ID].y)
# temp_d2=pow(pos_nodes[i].x-pos_nodes[ID].x,2)+pow(pos_nodes[i].y-pos_nodes[ID].y,2)
# temp_fenmu=temp_d2-pow(safe_r,2)
# temp_fenmu=pow(temp_fenmu,3)
# temp_x=temp_x/temp_fenmu*(temp_d2-pow(detect_R,2))
# temp_y=temp_y/temp_fenmu*(temp_d2-pow(detect_R,2))
# temp_x_sum=temp_x_sum+temp_x
# temp_y_sum=temp_y_sum+temp_y
temp_x=(1/r-1/detect_R)*(pos_nodes[ID].x-pos_nodes[i].x)
temp_y=(1/r-1/detect_R)*(pos_nodes[ID].y-pos_nodes[i].y)
temp_fenmu=pow(r,3)
temp_x=temp_x/temp_fenmu
temp_y=temp_y/temp_fenmu
temp_x_sum=temp_x_sum+temp_x
temp_y_sum=temp_y_sum+temp_y
avoid_delta=temp_x_sum*cos(angular_now)+temp_y_sum*sin(angular_now)
tb3_3_vel.linear.x=K1*(tb3_3_vel_delta_x*cos(angular_now)+tb3_3_vel_delta_y*sin(angular_now))+tb3_4_vel.linear.x+K3*avoid_delta
#tb3_3_vel.linear.x=K1*(tb3_3_vel_delta_x+tb3_3_vel_delta_y)+tb3_4_vel.linear.x
# print ('the vel=%f'%(tb3_3_vel.linear.x))
# delta_theta=(phi-angular_now)
# if abs(phi)>3.14 and abs(angular_now)>3.14:
# delta_theta=0
delta_theta=self.compute_theta(phi,angular_now)
# print ('the delta_ang=%f'%(delta_theta))
# tb3_3_vel.angular.z=tb3_4_vel.angular.z+K2*(tb3_3_vel_delta_x+tb3_3_vel_delta_y)
tb3_3_vel.angular.z=K2*delta_theta+tb3_4_vel.angular.z
self.cmd_vel.publish(tb3_3_vel)
def lidar(self,tb_pos):
msg = rospy.wait_for_message("scan", LaserScan)
LIDAR_ERR = 0.05
LIDAR_MAX = 1.5
obstacle=[]
min_dis=10
min_ang=0
min_point=Point()
for i in range(360):
if i <= 45 or i > 315:
obstacle_pos=Point()
if msg.ranges[i] >= LIDAR_ERR and msg.ranges[i]<=LIDAR_MAX:
obstacle_pos.x=tb_pos.x+msg.ranges[i]*cos(i)
obstacle_pos.y=tb_pos.y+msg.ranges[i]*sin(i)
obstacle.append(obstacle_pos)
if msg.ranges[i] < min_dis:
min_dis = msg.ranges[i]
min_ang = i
if min_dis<10:
min_point.x=tb_pos.x+min_dis*cos(i)
min_point.y=tb_pos.y+min_dis*sin(i)
else:
min_point.x=10
return min_point
def compute_theta(self,theta,rotation1):
if theta*rotation1<0:
if theta>0:
if abs(rotation1)+theta<=pi:
w=abs(rotation1)+theta
else:
w=-(2*pi+rotation1-theta)
else:
if rotation1+abs(theta)<=pi:
w=-(abs(theta)+rotation1)
else:
w=(2*pi-rotation1+theta)
else:
w=theta-rotation1
return w
def get_odom(self):
try:
(trans, rot) = self.tf_listener.lookupTransform(self.odom_frame, self.base_frame, rospy.Time(0))
rotation = euler_from_quaternion(rot)
except (tf.Exception, tf.ConnectivityException, tf.LookupException):
rospy.loginfo("TF Exception")
return
return (Point(*trans), rotation[2])
def point_callback_0(data):
global tb3_0_pos
tb3_0_pos.x=data.x
tb3_0_pos.y=data.y
def point_callback_1(data):
global tb3_1_pos
tb3_1_pos.x=data.x
tb3_1_pos.y=data.y
def point_callback_2(data):
global tb3_2_pos
tb3_2_pos.x=data.x
tb3_2_pos.y=data.y
def point_callback_4(data):
global tb3_4_pos
tb3_4_pos.x=data.x
tb3_4_pos.y=data.y
def vel_callback_4(data):
global tb3_4_vel
tb3_4_vel=data
if __name__ == '__main__':
try:
while not rospy.is_shutdown():
print(msg)
GotoPoint()
except:
rospy.loginfo("shutdown program.")