code: def on_resize(self, event):
      gl.glViewport(0, 0, *event.physical_size)
  
file_path: vispy/examples/gloo/gl/quad.py
imports: import numpy
  from vispy import app
  from vispy.gloo import gl
label_desc: Use image node_id 4 for calling the Canvas obj's underlying member method code with example usage: obj.on_resize(event) without return types