code: def on_draw(self, event):
      self.context.clear(color="white")
      self.visual.draw()
  
file_path: vispy/examples/basics/visuals/windbarb_quiver.py
imports: import itertools
  import numpy
  from vispy import app
  from vispy.visuals import WindbarbVisual
  from vispy.visuals.transforms import NullTransform
label_desc: Use image node_id 6 for calling the Canvas obj's underlying member method code with example usage: obj.on_draw(event) without return types