写pyqt代码显示matplotlib图片

这是一个简单的例子，显示如何使用 PyQt 和 Matplotlib 在 GUI 中显示图像。

import sys
from PyQt5 import QtWidgets, QtGui
from matplotlib.backends.backend_qt5agg import FigureCanvasQTAgg as FigureCanvas
from matplotlib.figure import Figure

class App(QtWidgets.QMainWindow):
    def __init__(self):
        super().__init__()
        self.title = 'Matplotlib in PyQt'
        self.left = 10
        self.top = 10
        self.width = 640
        self.height = 480
        self.initUI()
    
    def initUI(self):
        self.setWindowTitle(self.title)
        self.setGeometry(self.left, self.top, self.width, self.height)
        self.m = PlotCanvas(self, width=5, height=4)
        self.m.move(0,0)
        self.show()

class PlotCanvas(FigureCanvas):
    def __init__(self, parent=None, width=5, height=4, dpi=100):
        fig = Figure(figsize=(width, height), dpi=dpi)
        self.axes = fig.add_subplot(111)
        FigureCanvas.__init__(self, fig)
        self.setParent(parent)
        FigureCanvas.setSizePolicy(self, QtWidgets.QSizePolicy.Expanding, QtWidgets.QSizePolicy.Expanding)
        FigureCanvas.updateGeometry(self)
        self.plot()
    
    def plot(self):
        import numpy as np
        x = np.array([1, 2, 3, 4, 5])
        y = x ** 2
        self.axes.plot(x, y, 'r')

if __name__ == '__main__':
    app = QtWidgets.QApplication(sys.argv)
    ex = App()
    sys.exit(app.exec_())

这个例子中,我们创建了一个名为App的主窗口,然后在这个主窗口中添加了一个画布,用于显示 Matplotlib 图像。我们还定义了一个名为PlotCanvas的类,该类继承自FigureCanvas,并在其中绘制了一个简单的曲线图.