code: def on_timer(self, event):
      self.tick += 1 / 60.0
      c = abs(math.sin(self.tick))
      gloo.set_clear_color((c, c, c, 1))
      self.update()
  
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 3 for calling the Canvas obj's underlying member method code with example usage: obj.on_timer(event) without return types