code: def __setattr__(self, name, value):
      if isinstance(value, Visual):
          self.add_visual(name, value)
      super(PanZoomCanvas, self).__setattr__(name, value)
  
imports: import numpy
  import math
  from vispy import gloo, app, scene
  from vispy.visuals import Visual
  from vispy.visuals.shaders import Function, Variable
  from vispy.visuals.transforms import TransformSystem, BaseTransform
  from vispy.util.profiler import Profiler
label_desc: Use image node_id 9 for calling the PanZoomCanvas obj's underlying member method code with example usage: obj.__setattr__(name, value) without return types