code: def on_mouse_wheel(self, event):
      self.translate += -event.delta[1] / 5.0
      self.translate = max(2, self.translate)
      self.update_matrices()
      self.update()
  
file_path: vispy/examples/demo/gloo/brain.py
imports: from timeit import default_timer
  import numpy
  from vispy import gloo
  from vispy import app
  from vispy.util.transforms import perspective, translate, rotate
  from vispy.io import load_data_file
label_desc: Use image node_id 5 for calling the Canvas obj's underlying member method code with example usage: obj.on_mouse_wheel(event) without return types