绘制不更新qt GUI和pyqtgraph Python

Question

正如标题所说，我的情节不会更新。目标是在单击按钮时启动绘图。弹出窗口并形成轴，但不绘制曲线。我在qt designer中使用了pyqt5和GUI的pyqtgraph。如果我想在同一窗口中添加更多图表，那么最佳方法就是这样做。感谢

代码：

from PyQt5 import QtCore, QtGui, QtWidgets
import os,serial,jeje_rc
os.environ["TF_CPP_MIN_LOG_LEVEL"]="3"
import numpy as np
import pyqtgraph as pg




class Ui_MainWindow(object):

def ser(self):
    self.raw = serial.Serial('COM4', 9600)
    self.raw.close()
    self.raw.open()

def update(self):
    self.datos = self.raw.readline()
    self.datos1 = self.datos.decode().split(',')
    self.y1[self.m] = self.datos1[0]

    if self.m == 99:
        self.y1 = np.zeros(100, dtype=float)
        self.m = 0
    else:
        self.m += 1

    self.curva1.setData(self.y1)
    app.processEvents()

def start(self):
    self.ser()
    self.win = pg.GraphicsWindow()
    self.win.setWindowTitle('Datos de arduino')
    self.p1 = self.win.addPlot()
    self.p1.setYRange(0, 1024, padding=0)
    self.curva1 = self.p1.plot()
    self.datos = [0.0, 0.0, 0.0, 0.0, 0.0, 0.0]
    self.y1 = np.zeros(100, dtype=float)


def setupUi(self, MainWindow):
    MainWindow.setObjectName("MainWindow")
    MainWindow.setWindowTitle("ECG de 12 Derivaciones UAO")
    MainWindow.resize(800, 550)
    self.m=0      
    self.centralwidget = QtWidgets.QWidget(MainWindow)
    self.centralwidget.setMaximumSize(QtCore.QSize(805, 510))
    self.centralwidget.setObjectName("centralwidget")
    self.centralwidget.setWindowTitle("ECG de 12 Derivaciones UAO")
    self.label = QtWidgets.QLabel(self.centralwidget)
    self.label.setGeometry(QtCore.QRect(20, 270, 241, 19))
    self.label.setObjectName("label")
    self.line = QtWidgets.QFrame(self.centralwidget)
    self.line.setGeometry(QtCore.QRect(10, 230, 781, 20))
    self.line.setFrameShape(QtWidgets.QFrame.HLine)
    self.line.setFrameShadow(QtWidgets.QFrame.Sunken)
    self.line.setObjectName("line")
    self.label_2 = QtWidgets.QLabel(self.centralwidget)
    self.label_2.setGeometry(QtCore.QRect(600, 40, 181, 171))
    self.label_2.setObjectName("label_2")
    self.label_3 = QtWidgets.QLabel(self.centralwidget)
    self.label_3.setGeometry(QtCore.QRect(40, 10, 591, 41))
    font = QtGui.QFont()
    font.setPointSize(16)
    self.label_3.setFont(font)
    self.label_3.setObjectName("label_3")
    self.label_4 = QtWidgets.QLabel(self.centralwidget)
    self.label_4.setGeometry(QtCore.QRect(170, 150, 221, 41))
    font = QtGui.QFont()
    font.setPointSize(11)
    self.label_4.setFont(font)
    self.label_4.setObjectName("label_4")
    self.label_5 = QtWidgets.QLabel(self.centralwidget)
    self.label_5.setGeometry(QtCore.QRect(110, 190, 471, 41))
    font = QtGui.QFont()
    font.setPointSize(11)
    self.label_5.setFont(font)
    self.label_5.setObjectName("label_5")
    self.label_6 = QtWidgets.QLabel(self.centralwidget)
    self.label_6.setGeometry(QtCore.QRect(50, 100, 521, 51))
    font = QtGui.QFont()
    font.setPointSize(9)
    self.label_6.setFont(font)
    self.label_6.setObjectName("label_6")
    self.lineEdad = QtWidgets.QLineEdit(self.centralwidget)
    self.lineEdad.setGeometry(QtCore.QRect(110, 310, 261, 21))
    self.lineEdad.setObjectName("lineEdad")
    self.lineNombre = QtWidgets.QLineEdit(self.centralwidget)
    self.lineNombre.setGeometry(QtCore.QRect(110, 270, 261, 20))
    self.lineNombre.setObjectName("lineNombre")
    self.BotonInicio = QtWidgets.QPushButton(self.centralwidget)
    self.BotonInicio.setGeometry(QtCore.QRect(490, 290, 181, 41))
    self.BotonInicio.setObjectName("BotonInicio")
    self.BotonInicio.clicked.connect(self.start)
    self.label_7 = QtWidgets.QLabel(self.centralwidget)
    self.label_7.setGeometry(QtCore.QRect(20, 310, 68, 19))
    self.label_7.setObjectName("label_7")
    self.label_8 = QtWidgets.QLabel(self.centralwidget)
    self.label_8.setGeometry(QtCore.QRect(20, 350, 61, 19))
    self.label_8.setObjectName("label_8")
    self.label_9 = QtWidgets.QLabel(self.centralwidget)
    self.label_9.setGeometry(QtCore.QRect(20, 380, 111, 31))
    self.label_9.setObjectName("label_9")
    self.BoxGenero = QtWidgets.QComboBox(self.centralwidget)
    self.BoxGenero.setGeometry(QtCore.QRect(110, 350, 92, 25))
    self.BoxGenero.setObjectName("BoxGenero")
    self.BoxGenero.addItem("")
    self.BoxGenero.addItem("")
    self.plainTextPatologias = QtWidgets.QPlainTextEdit(self.centralwidget)
    self.plainTextPatologias.setGeometry(QtCore.QRect(110, 390, 261, 91))
    self.plainTextPatologias.setObjectName("plainTextPatologias")
    self.line_2 = QtWidgets.QFrame(self.centralwidget)
    self.line_2.setGeometry(QtCore.QRect(390, 250, 20, 241))
    self.line_2.setFrameShape(QtWidgets.QFrame.VLine)
    self.line_2.setFrameShadow(QtWidgets.QFrame.Sunken)
    self.line_2.setObjectName("line_2")
    self.BotonExportar = QtWidgets.QPushButton(self.centralwidget)
    self.BotonExportar.setGeometry(QtCore.QRect(490, 410, 181, 41))
    self.BotonExportar.setObjectName("BotonExportar")
    MainWindow.setCentralWidget(self.centralwidget)
    self.menubar = QtWidgets.QMenuBar(MainWindow)
    self.menubar.setGeometry(QtCore.QRect(0, 0, 805, 31))
    self.menubar.setObjectName("menubar")
    MainWindow.setMenuBar(self.menubar)
    self.statusbar = QtWidgets.QStatusBar(MainWindow)
    self.statusbar.setObjectName("statusbar")
    MainWindow.setStatusBar(self.statusbar)


    self.retranslateUi(MainWindow)
    QtCore.QMetaObject.connectSlotsByName(MainWindow)
    timer = QtCore.QTimer()
    timer.timeout.connect(self.update)
    timer.start(0)


def retranslateUi(self, MainWindow):
    _translate = QtCore.QCoreApplication.translate
    MainWindow.setWindowTitle(_translate("MainWindow", "ECG de 12 Derivaciones"))
    self.label.setText(_translate("MainWindow", "Nombre:"))
    self.label_2.setText(_translate("MainWindow", "<html><head/><body><p><img src=\":/newPrefix/logo-universidad-autonoma-de-occidente.png\"/></p></body></html>"))
    self.label_3.setText(_translate("MainWindow", "Electrocardiógrafo De 12 Derivaciones"))
    self.label_4.setText(_translate("MainWindow", "Facultad de ingenieria"))
    self.label_5.setText(_translate("MainWindow", " Universidad Autonoma De Occidente"))
    self.label_6.setText(_translate("MainWindow", "Por: Mario Gomez, Viviana Calero, Sara Chillito, Stefania Calderon"))
    self.BotonInicio.setText(_translate("MainWindow", "Inicio del programa"))
    self.label_7.setText(_translate("MainWindow", "Edad:"))
    self.label_8.setText(_translate("MainWindow", "Genero:"))
    self.label_9.setText(_translate("MainWindow", "Patologias:"))
    self.BoxGenero.setItemText(0, _translate("MainWindow", "Hombre"))
    self.BoxGenero.setItemText(1, _translate("MainWindow", "Mujer"))
    self.BotonExportar.setText(_translate("MainWindow", "Exportar datos"))



if __name__ == "__main__":
  import sys
  app = QtWidgets.QApplication(sys.argv)
  MainWindow = QtWidgets.QMainWindow()
  ui = Ui_MainWindow()
  ui.setupUi(MainWindow)
  MainWindow.show()
  sys.exit(app.exec_())

Answer 1

建议不要修改Qt Designer提供的代码，因为如果你想修改设计，你必须重写你的代码，除了Ui_MainWindow类不是一个小部件，而是一个用来填充一些小部件的类，所以我建议删除更改。

另一方面不适合使用范围为0的计时器运行，因为它不允许更新GUI，另一方面串行的读取是阻塞的，因此可能的解决方案是使用{ {1}}，并使用信号更新GUI线程中的数据。

QThread

正如您所看到的，我做了一些更改以改进应用程序作为验证，在必要时使用变量等。

虽然与Qt兼容的方法是使用class Ui_MainWindow(object): ... class ArduinoThread(QtCore.QThread): dataChanged = QtCore.pyqtSignal(str) def __init__(self, *args, **kwargs): QtCore.QThread.__init__(self, *args, **kwargs) self.raw = serial.Serial('com4', 9600) self.raw.close() self.raw.open() def run(self): while True: datos_array = self.raw.readline().decode().split(',') if datos_array: datos = datos_array[0] self.dataChanged.emit(datos) QtCore.QThread.msleep(10) class MainWindow(QtWidgets.QMainWindow, Ui_MainWindow): def __init__(self, *args, **kwargs): QtWidgets.QMainWindow.__init__(self, *args, **kwargs) self.setupUi(self) self.BotonInicio.clicked.connect(self.start) self.m = 0 def update_plot(self, dato): if self.m > 99: self.y1 = np.zeros(100, dtype=float) self.m = 0 else: self.y1[self.m] = dato self.m += 1 self.curva1.setData(self.y1) def start(self): thread = ArduinoThread(self) thread.dataChanged.connect(self.update_plot) thread.start() self.win = pg.GraphicsWindow() self.win.setWindowTitle('Datos de arduino') self.p1 = self.win.addPlot() self.p1.setYRange(0, 1024, padding=0) self.curva1 = self.p1.plot() self.y1 = np.zeros(100, dtype=float) if __name__ == '__main__': import sys app = QtWidgets.QApplication(sys.argv) w = MainWindow() w.show() sys.exit(app.exec_()) 在有新数据时发出QSerialPort信号：

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