在PyQt5中将图表嵌入到graphicsView中

Question

我将使用pyqtgraph在PyQt5 GUI中进行绘图。我可以在弹出窗口中绘制，但我正在尝试将图形嵌入graphicsView区域。

这是如何在新窗口中完成简单绘图的方法：

    self.pushButton.clicked.connect(self.btn_clk)

    MainWindow.show()
def btn_clk(self):
    L = [1,2,3,4,5]
    pg.plot(L)

我试着使用这行代码来嵌入图表，但是它无效：

    self.pushButton.clicked.connect(self.btn_clk)

    MainWindow.show()
def btn_clk(self):
    L = [1,2,3,4,5]
    self.graphicsView.plot(L)

以下是完整的代码：

import pyqtgraph as pg
from PyQt5 import QtCore, QtGui, QtWidgets

class Ui_MainWindow(object):
    def setupUi(self, MainWindow):
        MainWindow.setObjectName("MainWindow")
        MainWindow.resize(662, 512)
        self.centralwidget = QtWidgets.QWidget(MainWindow)
        self.centralwidget.setObjectName("centralwidget")
        self.horizontalLayout = QtWidgets.QHBoxLayout(self.centralwidget)
        self.horizontalLayout.setObjectName("horizontalLayout")
        self.verticalLayout = QtWidgets.QVBoxLayout()
        self.verticalLayout.setObjectName("verticalLayout")
        self.lineEdit = QtWidgets.QLineEdit(self.centralwidget)
        self.lineEdit.setObjectName("lineEdit")
        self.verticalLayout.addWidget(self.lineEdit)
        self.graphicsView = QtWidgets.QGraphicsView(self.centralwidget)
        self.graphicsView.setObjectName("graphicsView")
        self.verticalLayout.addWidget(self.graphicsView)
        self.pushButton = QtWidgets.QPushButton(self.centralwidget)
        self.pushButton.setObjectName("pushButton")
        self.verticalLayout.addWidget(self.pushButton)
        self.horizontalLayout.addLayout(self.verticalLayout)
        MainWindow.setCentralWidget(self.centralwidget)
        self.menubar = QtWidgets.QMenuBar(MainWindow)
        self.menubar.setGeometry(QtCore.QRect(0, 0, 662, 21))
        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)

    def retranslateUi(self, MainWindow):
        _translate = QtCore.QCoreApplication.translate
        MainWindow.setWindowTitle(_translate("MainWindow", "MainWindow"))
        self.pushButton.setText(_translate("MainWindow", "PushButton"))

        self.pushButton.clicked.connect(self.btn_clk)

        MainWindow.show()
    def btn_clk(self):
        L = [1,2,3,4,5]
        pg.plot(L)#this line plots in a new window
        self.graphicsView.plot(L)#this line doesn't work



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_()) 

- Joe T. Boka

Answer 1

Pg.plot返回pg.graphicsWindows.PlotWindow类的一个实例，该类继承自QGraphicsView。也就是说，pg.graphicsWindows.PlotWindow用于绘图，但QGraphicsView不是。如果你想在小部件中嵌入一个图表，你必须使用pg.PlotWidget()类，你必须更改：

self.graphicsView = QtWidgets.QGraphicsView(self.centralwidget)

to:

self.graphicsView = pg.PlotWidget(self.centralwidget)

并且：

def btn_clk(self):
    L = [1,2,3,4,5]
    self.graphicsView.plot(L)#this line doesn't work

输出：

（注：此内容为HTML代码，不做翻译）

- eyllanesc

---

再次感谢！完美运作。我很感激。 - Joe T. Boka

是的，我刚刚给您发送了另一封电子邮件。 - Joe T. Boka