code: def paintEvent(self, ev):
      super().paintEvent(ev)
      p = QtGui.QPainter(self)
      p.setBrush(QtGui.QBrush(QtGui.QColor(0, 0, 0)))
      p.drawEllipse(self.spotPos.x() - 3, self.spotPos.y() - 3, 6, 6)
      p.end()
  
file_path: pyqtgraph/pyqtgraph/widgets/JoystickButton.py
imports: from math import hypot
  from ..Qt import QtCore, QtGui, QtWidgets
label_desc: Use image node_id 9 for calling the JoystickButton obj's underlying member method code with example usage: obj.paintEvent(ev) without return types