def paintEvent(self, event):
painter = QPainter(self)
bounds = QRectF(-self.__max_distance, -self.__max_distance,
self.__max_distance * 2,
self.__max_distance * 2).translated(self._center())
bounds2 = QRectF(-30, -30, 60, 60).translated(self._center())
painter.drawEllipse(bounds)
painter.drawEllipse(bounds2)
painter.setBrush(Qt.black)
painter.dwawEllipse(self._center_ellipse())
