将Matplotlib图作为QGraphicsItem/放入QGraphicsView

import sys
from PyQt5.QtWidgets import QApplication, QGraphicsView, QGraphicsScene
from PyQt5.QtCore import Qt
from matplotlib.backends.backend_qt5agg import FigureCanvasQTAgg as FigureCanvas
from matplotlib.figure import Figure

class MatplotlibItem(QGraphicsItem):
    def __init__(self, fig):
        super().__init__()
        self.fig = fig
        self.canvas = FigureCanvas(self.fig)
        self.canvas.setParent(self)
        self.setFlag(QGraphicsItem.ItemHasNoContents, False)
    
    def boundingRect(self):
        return self.canvas.boundingRect()
    
    def paint(self, painter, option, widget):
        self.canvas.draw(painter, option, widget)

app = QApplication(sys.argv)
view = QGraphicsView()
scene = QGraphicsScene()
view.setScene(scene)

# 创建Matplotlib图
fig = Figure()
ax = fig.add_subplot(111)
ax.plot([1, 2, 3, 4, 5], [1, 4, 9, 16, 25])

# 创建MatplotlibItem并添加到场景中
item = MatplotlibItem(fig)
scene.addItem(item)

# 设置视图参数
view.setRenderHint(QPainter.Antialiasing)
view.setRenderHint(QPainter.TextAntialiasing)
view.setViewportUpdateMode(QGraphicsView.FullViewportUpdate)
view.setDragMode(QGraphicsView.ScrollHandDrag)
view.setInteractive(True)
view.show()

sys.exit(app.exec_())