如何在PyQt小部件中渲染牵牛星/织女星

import sys
from PyQt5.QtWidgets import QApplication, QWidget, QVBoxLayout
from PyQt5.QtGui import QPainter, QPen, QColor
from PyQt5.QtCore import Qt

class MyWidget(QWidget):
    def __init__(self):
        super().__init__()
        self.setWindowTitle("Render Vega/Altair in PyQt Widget")
        self.setGeometry(100, 100, 400, 400)

    def paintEvent(self, event):
        painter = QPainter(self)
        painter.setRenderHint(QPainter.Antialiasing)

        # 绘制牵牛星/织女星
        pen = QPen(QColor(255, 0, 0))
        pen.setWidth(2)
        painter.setPen(pen)
        painter.drawEllipse(100, 100, 200, 200)

        pen.setColor(QColor(0, 0, 255))
        painter.setPen(pen)
        painter.drawLine(100, 200, 300, 200)
        painter.drawLine(200, 100, 200, 300)

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