Question

我使用python3.5。我想在pyqt5中使用matplotlib，我写下面的代码。但是虽然它显示了按钮，但它没有显示图形。我希望在我希望的坐标中显示图形。所以，我不想使用“layout”命令。

import sys
from PyQt5 import QtWidgets

from matplotlib.backends.backend_qt5agg import FigureCanvasQTAgg as FigureCanvas
from matplotlib.backends.backend_qt5 import NavigationToolbar2QT as NavigationToolbar
import matplotlib.pyplot as plt

import random

class Window(QtWidgets.QDialog):
    def __init__(self, parent=None):
        super().__init__(parent)

        self.setWindowTitle("グラフ")
        self.setGeometry(300,300,500,500)

        self.figure = plt.figure()
        self.axes = self.figure.add_subplot(111)
        # We want the axes cleared every time plot() is called
        self.axes.hold(False)
        self.canvas = FigureCanvas(self.figure)
        self.canvas.move(0,0)


        self.toolbar = NavigationToolbar(self.canvas, self)
        self.toolbar.hide()

        # Just some button 
        self.button1 = QtWidgets.QPushButton('Plot',self)
        self.button1.clicked.connect(self.plot)
        self.button1.move(0,400)

    def plot(self):
        ''' plot some random stuff '''
        data = [random.random() for i in range(25)]
        self.axes.plot(data, '*-')
        self.canvas.draw()

if __name__ == '__main__':
    app = QtWidgets.QApplication(sys.argv)

    main = Window()
    main.setWindowTitle('Simple QTpy and MatplotLib example with Zoom/Pan')
    main.show()

    sys.exit(app.exec_())

Answer 1

想要绘制的窗口小部件必须是子窗口，或者将主窗口小部件作为祖先，在您的情况下，self.canvas没有父窗口，因此解决方案是使用setParent()传递一个方法：

class Window(QtWidgets.QDialog):
    def __init__(self, parent=None):
        super().__init__(parent)

        self.setWindowTitle("グラフ")
        self.setGeometry(300,300,800,500)

        self.figure = plt.figure()
        self.axes = self.figure.add_subplot(111)
        # We want the axes cleared every time plot() is called
        self.axes.hold(False)
        self.canvas = FigureCanvas(self.figure)

        self.canvas.setParent(self)

        self.canvas.move(100,20)

        self.toolbar = NavigationToolbar(self.canvas, self)
        self.toolbar.hide()

        # Just some button 
        self.button1 = QtWidgets.QPushButton('Plot',self)
        self.button1.clicked.connect(self.plot)
        self.button1.move(0,400)

    def plot(self):
        ''' plot some random stuff '''
        data = [random.random() for i in range(25)]
        self.axes.plot(data, '*-')
        self.canvas.draw()

if __name__ == '__main__':
    app = QtWidgets.QApplication(sys.argv)

    main = Window()
    main.setWindowTitle('Simple QTpy and MatplotLib example with Zoom/Pan')
    main.show()

我想在pyqt5中使用matplotlib，但它没有显示图形

1 个答案: