code: def on_resize(self, event):
      self.activate_zoom()
  
file_path: vispy/examples/demo/gloo/unstructured_2d.py
imports: import sys
  import numpy
  import scipy.spatial
  from vispy import gloo, app
  from vispy.util.transforms import ortho
label_desc: Use image node_id 5 for calling the Canvas obj's underlying member method code with example usage: obj.on_resize(event) without return types