如何使用PyQt5获取像素位置并在该位置上绘制一个点？

from PyQt5.QtWidgets import QApplication, QMainWindow
from PyQt5.QtGui import QPainter, QColor, QPen
from PyQt5.QtCore import Qt

class MyWindow(QMainWindow):
    def __init__(self):
        super().__init__()

    def mousePressEvent(self, event):
        x = event.pos().x()
        y = event.pos().y()
        self.drawPoint(x, y)

    def drawPoint(self, x, y):
        # 在给定的坐标位置上绘制一个点
        painter = QPainter(self)
        painter.setPen(QPen(Qt.black, 2))
        painter.drawPoint(x, y)

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