Pyside2嵌入Matplotlib的绘图

import matplotlib
from matplotlib.backends.backend_qt5agg import FigureCanvasQTAgg as FigureCanvas
# from matplotlib.figure import Figure
import matplotlib.pyplot as plt

通过继承FigureCanvas类，使得该类既是一个PyQt5的Qwidget，又是一个matplotlib的FigureCanvas。
示例：

import sys

from PySide2.QtWidgets import QWidget, QGridLayout, QApplication
import numpy as np
from matplotlib.backends.backend_qt5agg import FigureCanvasQTAgg as FigureCanvas
import matplotlib.pyplot as plt


class MainWidget(QWidget):
    def __init__(self):
        super(MainWidget, self).__init__()
        self.main_layout = QGridLayout()
        self.setLayout(self.main_layout)
        widegt1 = QWidget()
        widegt1.setStyleSheet("background-color: red")
        widget2 = QWidget()
        widget2.setStyleSheet("background-color: red")
        self.main_layout.addWidget(widegt1, 0, 0, 3, 2)
        self.main_layout.addWidget(widget2, 0, 2, 2, 1)

        chart = self.gv_visual_data_content = MyFigureCanvas(
                                             xlim=(0, 2*np.pi),
                                             ylim=(-1, 1))
        x = np.arange(0, 2 * np.pi, np.pi / 100)
        y = np.cos(x)
        self.gv_visual_data_content.axes.plot(x, y)
        self.gv_visual_data_content.axes.set_title('cos()')

        self.main_layout.addWidget(chart, 2, 2, 1, 1)
        self.main_layout.setColumnStretch(0, 1)
        self.main_layout.setColumnStretch(1, 1)
        self.main_layout.setColumnStretch(2, 1)
        self.main_layout.setRowStretch(0, 1)
        self.main_layout.setRowStretch(1, 1)
        self.main_layout.setRowStretch(2, 1)


class MyFigureCanvas(FigureCanvas):
    ''' 通过继承FigureCanvas类，使得该类既是一个PyQt5的Qwidget，又是一个matplotlib的FigureCanvas，这是连接pyqt5与matplotlib的关键 '''

    def __init__(self, parent=None, width=10, height=5, xlim=(0, 2500), ylim=(-2, 2), dpi=100):
        # 创建一个Figure
        fig = plt.Figure(figsize=(width, height), dpi=dpi, tight_layout=True)  # tight_layout: 用于去除画图时两边的空白

        FigureCanvas.__init__(self, fig)  # 初始化父类
        self.setParent(parent)

        self.axes = fig.add_subplot(111)  # 调用figure下面的add_subplot方法，类似于matplotlib.pyplot下面的subplot方法
        self.axes.spines['top'].set_visible(False)  # 去掉上面的横线
        self.axes.spines['right'].set_visible(False)
        self.axes.set_xlim(xlim)
        self.axes.set_ylim(ylim)


if __name__ == "__main__":
    app = QApplication(sys.argv)
    window = MainWidget()
    window.show()
    sys.exit(app.exec_())