pyside实现matplotlib画板嵌入QT界面，通过鼠标按住拖动画板中的球交互的代码

可以参考下面的代码：

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

class MyMplCanvas(FigureCanvas):
    def __init__(self):
        self.fig = Figure()
        self.axes = self.fig.add_subplot(111)
        self.axes.set_xlim([0, 10])
        self.axes.set_ylim([0, 10])
        self.axes.set_xlabel('X')
        self.axes.set_ylabel('Y')
        self.axes.set_title('My Plot')
        self.circle = self.axes.plot([5], [5], 'o', markersize=20, color='r')[0]
        FigureCanvas.__init__(self, self.fig)
        self.setFixedSize(400, 400)
        self.setMouseTracking(True)
        self.start_x, self.start_y = None, None

    def mousePressEvent(self, event):
        if event.button() == Qt.LeftButton:
            self.start_x, self.start_y = event.x(), event.y()

    def mouseMoveEvent(self, event):
        if event.buttons() == Qt.LeftButton:
            dx = event.x() - self.start_x
            dy = event.y() - self.start_y
            self.circle.set_xdata([self.circle.get_xdata() + dx])
            self.circle.set_ydata([self.circle.get_ydata() + dy])
            self.draw()
            self.start_x, self.start_y = event.x(), event.y()

class MyMainWindow(QMainWindow):
    def __init__(self):
        QMainWindow.__init__(self)
        self.setWindowTitle('My Window')
        self.canvas = MyMplCanvas()
        self.setCentralWidget(self.canvas)

if __name__ == '__main__':
    app = QApplication(sys.argv)
    win = MyMainWindow()
    win.show()
    sys.exit(app.exec_())

这段代码实现了将 matplotlib 画板嵌入到 PyQt 界面中，并通过鼠标拖动画板中的球实现交互。具体实现过程可以参考代码注释。