python - 该图未在matplotlib中绘制

我正在通过使用Arduino数据转换为FFT在matplotlib中绘制图形。但是，相同的错误不会导致图形。我认为这是因为update（）中的self应该怎么办？我的代码中出现Typeerror时，我不知道如何更改。如果发现问题，可以告诉我吗？
+我解决了错误。但是，该图形不会打印。该代码已被整体修改。发生什么事？

from PyQt5.QtWidgets import*
from matplotlib.backends.backend_qt5agg import FigureCanvasQTAgg as FigureCanvas
from matplotlib.figure import Figure
import matplotlib.pyplot as plt
import random
from PyQt5 import QtCore, QtGui, QtWidgets
import datetime
import serial
import time
import random
import numpy as np
from matplotlib import animation
from collections import deque  # import a "circular" list
from threading import Thread, Lock

class Ui_MainWindow(object):
    def setupUi(self, MainWindow):
        MainWindow.setObjectName("MainWindow")
        MainWindow.resize(1212, 600)
        self.centralwidget = QtWidgets.QWidget(MainWindow)
        self.centralwidget.setObjectName("centralwidget")

        self.gridLayout = QtWidgets.QGridLayout()
        self.gridLayout.setContentsMargins(0, 0, 0, 0)
        self.gridLayout.setObjectName("gridLayout")
        self.widget = matplotlibWidget()
        self.widget.setObjectName("widget")
        self.gridLayout.addWidget(self.widget, 0, 0, 1, 1)

        self.centralwidget.setLayout(self.gridLayout)
        MainWindow.setCentralWidget(self.centralwidget)

        self.retranslateUi(MainWindow)

        QtCore.QMetaObject.connectSlotsByName(MainWindow)

    def retranslateUi(self, MainWindow):
        _translate = QtCore.QCoreApplication.translate
        MainWindow.setWindowTitle(_translate("MainWindow", "MainWindow"))
#from matplotlibwidgetFile import matplotlibWidget

class matplotlibWidget(QWidget):

    def __init__(self, parent = None):
        QWidget.__init__(self,parent)
        self.i = 0
        self.data = []
        lock = Lock()

        freq = 2000              # 1/T
        self.guarda = 100           # 200
        r = range(0, int(freq/2+1), int(freq/self.guarda))
        self.frequencia = np.fft.fftfreq(self.guarda, d=1/freq)
        self.acelx = deque([], maxlen=self.guarda)

        self.fig = plt.figure()
        self.ax = self.fig.add_subplot(111)
        self.canvas = FigureCanvas(self.fig)
        self.right_layout = QVBoxLayout()
        self.right_layout.addWidget(self.canvas)
        self.setLayout(self.right_layout)
        self.ax.set_xlim((0,int(freq/2)))
        self.ax.set_ylim((0,1000))
        self.line, = self.ax.plot([],[])
        self.ax.grid(True)


        def data_input():
            for line in arduinoData:
                try:
                    self.i+=1
                    self.acelx.append(float(line))
                    with lock:
                        if self.i > len(self.acelx):
                            self.data = np.fft.fft(self.acelx)
                except ValueError:
                    pass
        t = Thread(target=data_input)
        t.daemon = True
        t.start()

        S = Scope(self.line,self.frequencia, self.guarda, self.data, self.ax, self.acelx, self.i )
        timer = QtCore.QTimer()
        timer.timeout.connect(S.update)
        timer.start(0)

class Scope(matplotlibWidget) :
    def __init__(self, line, frequencia, guarda, data, ax, acelx, i) :
        self.line, = line,
        self.ax = ax
        self.frequencia = frequencia
        self.guarda = guarda
        self.data = data
        self.acelx = acelx
        self.i = i

    def update(self) :

        if self.i > len(self.acelx) :
            self.line.set_data(self.frequencia[:int(self.guarda/2)], abs(np.real(self.data[:int(self.guarda/2)])))
            self.ax.figure.canvas.draw()

        return (self.line,)



if __name__ == "__main__":
    import sys
    value = [0,0,0,0,0,0,0,0,0,0]
    arduinoData = serial.Serial('com5', 9600)
    app = QtWidgets.QApplication(sys.argv)
    MainWindow = QtWidgets.QMainWindow()
    ui = Ui_MainWindow()
    ui.setupUi(MainWindow)
    MainWindow.show()
    sys.exit(app.exec_())

最佳答案

您必须创建实例：

s = Scope()
timer = QtCore.QTimer()
timer.timeout.connect(s.update)

要么

timer = QtCore.QTimer()
timer.timeout.connect(Scope().update)