【发布时间】：2021-03-14 19:40:40
【问题描述】：
我想在我当前的 pyqt 脚本中添加更新数据字段（数字）的功能。我尝试使用“addLabel”，但无法动态更新其内容。
关于如何制作它的任何建议？我正在使用 addPlot 函数来创建将处理来自 UDP 数据包的一些数据的图。在某些情况下，我只想动态显示值。不确定用于此目的的最佳小部件是什么？
当前脚本：
from pyqtgraph.Qt import QtGui, QtCore
import numpy as np
import pyqtgraph as pg
from pyqtgraph.ptime import time
import struct
from struct import pack, unpack
import socket
app = QtGui.QApplication([])
data = []
data_throttle = []
data_brake = []
data_steering = []
data_state = []
data_error = []
pg.setConfigOption('background', (0,0,0))
#pg.setConfigOption(antialias=True)
win = pg.GraphicsWindow()
win.resize(500,200)
p1 = win.addPlot(title="Sequence")
p1.setWindowTitle('Sequence')
p1.setRange(QtCore.QRectF(0, 0, 100, 150))
#p1.setLabel('bottom', 'Packet', units=' ')
p1.showGrid(True, True)
p2 = win.addPlot(title="Throttle")
p2.setWindowTitle('Throttle')
p2.setRange(QtCore.QRectF(0, 0, 100, 255))
#p2.setLabel('bottom', 'Packet', units=' ')
p2.showGrid(True, True)
p3 = win.addPlot(title="Brake")
p3.setWindowTitle('Brake')
p3.setRange(QtCore.QRectF(0, 0, 100, 255))
#p3.setLabel('bottom', 'Packet', units=' ')
p3.showGrid(True, True)
p4 = win.addPlot(title="Steering")
p4.setWindowTitle('Steering')
p4.setRange(QtCore.QRectF(0, -1, 100, 2))
#p4.setLabel('bottom', 'Packet', units=' ')git
p4.showGrid(True, True)
p5 = win.addPlot(title="Vehicle State")
p5.setWindowTitle('Vehicle State')
p5.setRange(QtCore.QRectF(0, 0, 100, 10))
#p5.setLabel('bottom', 'Packet', units=' ')
p5.showGrid(True, True)
p6 = win.addPlot(title="Errors")
p6.setWindowTitle('Errors')
p6.setRange(QtCore.QRectF(0, 0, 100, 10))
#p6.setLabel('bottom', 'Packet', units=' ')
p6.showGrid(True, True)
top_label = "Percent"
bottom_label = "85"
l_labels = win.addLayout(col=1, colspan=1)
l_labels.addLabel(top_label, row=0, col=0, rowspan=1, colspan=1, size='30pt', bold=True)
l_labels.addLabel(bottom_label, row=2, col=0, rowspan=4, colspan=1, size='200pt', color='606060')
l_labels.setContentsMargins(0, 0, 0, 100)
curve = p1.plot(pen='r')
curve2 = p2.plot(pen='b')
curve3 = p3.plot(pen='g')
curve4 = p4.plot(pen='y')
curve5 = p5.plot(pen='r')
curve6 = p6.plot(pen='b')
# Receive UDP packets transmitted by a broadcasting service
RECEIVE_IP = ''
RECEIVE_PORT = 2337
RECEIVE_ADDRESS = (RECEIVE_IP, RECEIVE_PORT)
recv_socket = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
recv_socket.bind(RECEIVE_ADDRESS)
JOY_CODE = '=HBBBhHQQB'
ACK_CODE = '=HHBBHBBhBqB'
ptr = 0
lastTime = time()
fps = None
def update():
global recv_socket, fScale
global curve, data, data_throttle, data_brake, data_steering, ptr, p, lastTime, fps, data_state, data_error
recv_message, address = recv_socket.recvfrom(22)
message_id, ack_payload, ack_seq, vehicle_state, vehicle_speed, throttle, brake, steering, error, timestamp, checksum = struct.unpack(ACK_CODE, recv_message)
#data = throttle
data.append(ack_seq)
data = data[-100:]
data_throttle.append(throttle)
data_throttle = data_throttle[-100:]
data_brake.append(brake)
data_brake = data_brake[-100:]
data_steering.append(steering / 32768)
data_steering = data_steering[-100:]
vehicle_state = vehicle_state & 0x07
data_state.append(vehicle_state)
data_state = data_state[-100:]
data_error.append(error)
data_error = data_error[-100:]
#print(throttle)
#print("got data", data, " ", lastTime, "\n")
# print data
#curve.setData(fScale,data,_callSync='off')
curve.setData(data,_callSync='off')
curve2.setData(data_throttle,_callSync='off')
curve3.setData(data_brake,_callSync='off')
curve4.setData(data_steering,_callSync='off')
curve5.setData(data_state, _callSync='off')
curve6.setData(data_error, _callSync='off')
bottom_label = vehicle_state
now = time()
dt = now - lastTime
lastTime = now
app.processEvents() ## force complete redraw for every plot
timer = QtCore.QTimer()
timer.timeout.connect(update)
timer.start(0)
## Start Qt event loop unless running in interactive mode.
if __name__ == '__main__':
import sys
if (sys.flags.interactive != 1) or not hasattr(QtCore, 'PYQT_VERSION'):
QtGui.QApplication.instance().exec_()
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