code: def drawPicture(self):
      self.picture = QtGui.QPicture()
      painter = QtGui.QPainter(self.picture)
      self._render(painter)
      painter.end()
  
imports: import numpy
  from ..None import functions
  from ..None import getConfigOption
  from ..None import Qt
  from ..Qt import QtCore, QtGui
  from .GraphicsObject import GraphicsObject
label_desc: Use image node_id 8 for calling the BarGraphItem obj's underlying member method code with example usage: obj.drawPicture() without return types