def paintEvent(self, event):
super().paintEvent(event)
painter = QPainter(self)
painter.beginNativePainting()
painter.setRenderHint(QPainter.Antialiasing)
painter.setRenderHint(QPainter.SmoothPixmapTransform)
painter.setPen(QPen(Qt.green, 1, Qt.DotLine))
painter.drawRect(self.rubberband.rect())
painter.setPen(QPen(Qt.green, 1))
x_begin = self.rubberband.x()
x_half = self.rubberband.x() + self.rubberband.width() / 2
x_full = self.rubberband.x() + self.rubberband.width()
y_begin = self.rubberband.y()
y_half = self.rubberband.y() + self.rubberband.height() / 2
y_full = self.rubberband.y() + self.rubberband.height()
points = [QPoint(x_half, y_begin), QPoint(x_half, y_full)]
painter.drawLines(points)
painter.endNativePainting()
painter.end()
