text: # !/usr/bin/env python
  # -*- coding: utf-8 -*-
  """ Probably the simplest vispy example
  """
  import sys
  
  from vispy import app, gloo
  
  canvas = app.Canvas(keys='interactive')
  
  
  @canvas.connect
  def on_draw(event):
      gloo.set_clear_color((0.2, 0.4, 0.6, 1.0))
      gloo.clear()
  
  canvas.show()
  
  if __name__ == '__main__' and sys.flags.interactive == 0:
      app.run()
  