code: def on_draw(self, event):
      gloo.clear(color=True)
  
file_path: vispy/examples/tutorial/app/simple_wx.py
imports: import wx
  import math
  from vispy import app, gloo
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