code: def apply_zoom(self):
      self.program["u_resolution"] = self.physical_size
      gloo.set_viewport(0, 0, *self.physical_size)
  
file_path: vispy/examples/demo/gloo/high_frequency.py
imports: from vispy import gloo, app, keys
label_desc: Use image node_id 6 for calling the Canvas obj's underlying member method code with example usage: obj.apply_zoom() without return types