code: def on_mouse_wheel(self, event):
      self.print_mouse_event(event, "Mouse wheel")
  
file_path: vispy/examples/tutorial/app/app_events.py
imports: from vispy import gloo, app
label_desc: Use image node_id 9 for calling the Canvas obj's underlying member method code with example usage: obj.on_mouse_wheel(event) without return types