Question

我在QT Designer中创建了一个QMainWindow，其中一个GraphicsView对象已被提升为pyQTGraph PlotWidget。我想使用QTimer事件来获取实时串行数据（Y）并将其绘制为（X）为QTimer事件设置的1秒增量。但是，我遇到的问题是当使用QT的QMainWindow作为主要表单时，我得到错误“QObject :: startTimer：QTimer只能用于以QThread启动的线程”，但如果我使用QT的QWidget作为主要表单一切正常，没有错误。

如何将QTimer与QT的QMainWindow一起使用

QT4和QT Designer Python 3 PyQTGraph

以下是表格代码：

# -*- coding: utf-8 -*-

# Form implementation generated from reading ui file 'MainPlotWindow.ui'
#
# Created by: PyQt4 UI code generator 4.11.4
#
# WARNING! All changes made in this file will be lost!

from PyQt4 import QtCore, QtGui

try:
    _fromUtf8 = QtCore.QString.fromUtf8
except AttributeError:
    def _fromUtf8(s):
        return s

try:
    _encoding = QtGui.QApplication.UnicodeUTF8
    def _translate(context, text, disambig):
        return QtGui.QApplication.translate(context, text, disambig, _encoding)
except AttributeError:
    def _translate(context, text, disambig):
        return QtGui.QApplication.translate(context, text, disambig)

class Ui_MainWindow(object):
    def setupUi(self, MainWindow):
        MainWindow.setObjectName(_fromUtf8("MainWindow"))
        MainWindow.resize(735, 374)
        self.centralwidget = QtGui.QWidget(MainWindow)
        self.centralwidget.setObjectName(_fromUtf8("centralwidget"))
        self.plot = PlotWidget(self.centralwidget)
        self.plot.setGeometry(QtCore.QRect(30, 40, 681, 261))
        sizePolicy = QtGui.QSizePolicy(QtGui.QSizePolicy.Expanding, QtGui.QSizePolicy.Expanding)
        sizePolicy.setHorizontalStretch(0)
        sizePolicy.setVerticalStretch(0)
        sizePolicy.setHeightForWidth(self.plot.sizePolicy().hasHeightForWidth())
        self.plot.setSizePolicy(sizePolicy)
        self.plot.setFrameShape(QtGui.QFrame.WinPanel)
        self.plot.setFrameShadow(QtGui.QFrame.Sunken)
        self.plot.setHorizontalScrollBarPolicy(QtCore.Qt.ScrollBarAlwaysOff)
        self.plot.setObjectName(_fromUtf8("plot"))
        MainWindow.setCentralWidget(self.centralwidget)
        self.menubar = QtGui.QMenuBar(MainWindow)
        self.menubar.setGeometry(QtCore.QRect(0, 0, 735, 21))
        self.menubar.setObjectName(_fromUtf8("menubar"))
        MainWindow.setMenuBar(self.menubar)
        self.statusbar = QtGui.QStatusBar(MainWindow)
        self.statusbar.setObjectName(_fromUtf8("statusbar"))
        MainWindow.setStatusBar(self.statusbar)

        self.retranslateUi(MainWindow)
        QtCore.QMetaObject.connectSlotsByName(MainWindow)

    def retranslateUi(self, MainWindow):
        MainWindow.setWindowTitle(_translate("MainWindow", "MainWindow", None))

from pyqtgraph import PlotWidget

以下是重现错误的简单测试程序：

from PyQt4.QtCore import QThread, SIGNAL, QSettings
import sys
from pyqtgraph.Qt import QtGui, QtCore
import numpy as np
import pyqtgraph as pg


from MainPlotWindow import *

'''=====================================================================
                            M A I N  G U I
   ====================================================================='''

class MyForm(QtGui.QMainWindow):
    def __init__(self, parent=None):
        QtGui.QWidget.__init__(self, parent)
        self.ui = Ui_MainWindow()
        self.ui.setupUi(self)



def PlotUpdate():
    print("Hello")



timer = QtCore.QTimer()
timer.timeout.connect(PlotUpdate)
timer.start(1000) # 1 Second Refesh Rate



if __name__ == "__main__":
    app = QtGui.QApplication(sys.argv)
    myapp = MyForm()
    myapp.show()
    sys.exit(app.exec_())

非常感谢任何帮助！

Answer 1

我建议在窗口小部件中使用QTimer，如下例所示：

class MyForm(QtGui.QMainWindow):
    def __init__(self, parent=None):
        QtGui.QWidget.__init__(self, parent)
        self.ui = Ui_MainWindow()
        self.ui.setupUi(self)

        timer = QtCore.QTimer(self)
        timer.timeout.connect(self.PlotUpdate)
        timer.start(100) # 1 Second Refesh Rate
        self.curve = self.ui.plot.plot()
        self.counter = 0

    def PlotUpdate(self):
        x = self.counter + np.arange(0, 10)
        y = 10*np.sin(np.pi*x/10)
        self.curve.setData(x, y)
        self.counter += 1

输出：

如何将QTimer与QT'QMainWindow一起使用（QTimer与QTWidget配合使用但不与QMainWindow配合使用）

1 个答案: