code: def on_draw(self, ev):
      gloo.clear(color="white", depth=True)
      self.box.draw()
  
file_path: vispy/examples/basics/visuals/box.py
imports: from vispy import app, gloo, visuals
  from vispy.geometry import create_box
  from vispy.visuals.transforms import MatrixTransform
label_desc: Use image node_id 4 for calling the Canvas obj's underlying member method code with example usage: obj.on_draw(ev) without return types