在PyQt5中如何在屏幕上移动一个点？

from PyQt5.QtWidgets import QApplication, QWidget
from PyQt5.QtGui import QPainter, QColor
from PyQt5.QtCore import QTimer

class MyWidget(QWidget):
    def __init__(self):
        super().__init__()
        self.x = 0
        self.y = 0
        self.timer = QTimer(self)
        self.timer.timeout.connect(self.updatePosition)
        self.timer.start(100)  # 每100毫秒更新一次位置

    def updatePosition(self):
        self.x += 10
        self.y += 10
        self.update()  # 更新窗口

    def paintEvent(self, event):
        painter = QPainter(self)
        painter.setPen(QColor(255, 0, 0))
        painter.drawPoint(self.x, self.y)

if __name__ == '__main__':
    app = QApplication([])
    widget = MyWidget()
    widget.show()
    app.exec_()