code: def on_draw(self, event):
      gloo.clear()
      self.program.draw("triangle_strip")
  
file_path: vispy/examples/gloo/rotating_quad.py
imports: from vispy import gloo, app
  from vispy.gloo import Program
label_desc: Use image node_id 2 for calling the Canvas obj's underlying member method code with example usage: obj.on_draw(event) without return types