Matplotlib图更新Raspberry Pi操作系统后没有响应

Question

我正在使用树莓派来模拟热水器的用电量和温度随时间的变化。数据由Arduino收集，并通过NRF24L01+发送到树莓派。更新Raspberry Pi操作系统后，尽管控制台显示一切正常，但该图形几乎立即停止响应。

import RPi.GPIO as GPIO
from lib_nrf24 import NRF24
import time
import spidev
import datetime as dt
import matplotlib.pyplot as plt
import matplotlib.animation as animation
from decimal import Decimal
# Create figure for plotting
fig = plt.figure()
fig.patch.set_facecolor('whitesmoke')
ax1 = fig.add_subplot(1, 1, 1)
ax2 = ax1.twinx()  # instantiate a second axes that shares the same x-axis
hFont = {'fontname':'sans-serif', 'weight':'bold', 'size':'22'}
xs = []
ysTemp = []
ysAC = []
ysDC = []
# This function is called periodically from FuncAnimation
def animate(i, xs, ysTemp, ysAC, ysDC):
values = getValues()
print(values)
temp_c = Decimal(values[2])
if temp_c < 0: temp_c = 0
wAC = Decimal(values[0])
if wAC < 0: wAC = 0
wDC = float(values[1]) * float(values[3][:4])
wDC = Decimal(wDC)
if wDC < 0: wDC = 0


# Add x and y to lists
xs.append(dt.datetime.now().strftime('%H:%M:%S'))
ysTemp.append(temp_c)
ysAC.append(wAC)
ysDC.append(wDC)
# Limit x and y lists to 20 items
xs = xs[-20:]
ysTemp = ysTemp[-20:]
ysDC = ysDC[-20:]
ysAC = ysAC[-20:]

# Draw x and y lists
ax1.clear()   
ax2.clear()

ax1.set_ylabel('Power Consumption', **hFont)
ax2.set_ylabel('Temperature', **hFont)

lineTemp, = ax2.plot(xs, ysTemp, 'k', label='Temp')
lineAC, = ax1.plot(xs, ysAC, 'c:', label='Mains')
lineDC, = ax1.plot(xs, ysDC, 'y--', label='Solar')
# Format plot
fig.autofmt_xdate()
plt.title('Power Consumption vs Temperature Over Time', **hFont, fontweight = 'heavy')
plt.legend([lineAC, lineDC,lineTemp], ['Mains', 'Solar', 'Temp'])
#######################################################
GPIO.setmode(GPIO.BCM)
pipes = [[0xE8, 0xE8, 0xF0, 0xF0, 0xE1], [0xF0, 0xF0, 0xF0, 0xF0, 0xE1]]
radio = NRF24(GPIO, spidev.SpiDev())
radio.begin(0, 17)
radio.setPayloadSize(32)
radio.setChannel(0x76)
radio.setDataRate(NRF24.BR_1MBPS)
radio.setPALevel(NRF24.PA_MIN)
radio.setAutoAck(True)
radio.enableDynamicPayloads()
radio.enableAckPayload()
radio.openReadingPipe(1, pipes[1])
radio.startListening()
print("Radio Started")
#############################################################
def getValues():
while not radio.available(0):
time.sleep(1 / 100)
receivedMessage = []
radio.read(receivedMessage, radio.getDynamicPayloadSize())

string = ""
for n in receivedMessage:
# Decode into standard unicode set
if (n >= 32 and n <= 126):
string += chr(n)
measureList = list(string.split(","))
return measureList
# Set up plot to call animate() function periodically
ani = animation.FuncAnimation(fig, animate, fargs=(xs, ysTemp, ysAC, ysDC), interval=1000, blit=False)
plt.get_current_fig_manager().full_screen_toggle()
plt.ioff()
plt.show()
plt.draw()

Answer 1

这是一个简单的修复，尽管我不确定Raspberry Pi操作系统的GUI是否发生了变化，或者matplotlib是否有问题。

添加以下行：

import matplotlib
matplotlib.use('TkAgg')

之前：

import matplotlib.pyplot as plt