code: def on_mouse_release(self, event):
      self._button = None
      self.on_mouse_move(event)
  
file_path: vispy/examples/demo/gloo/boids.py
imports: import time
  import numpy
  from scipy.spatial import cKDTree
  from vispy import gloo
  from vispy import app
label_desc: Use image node_id 4 for calling the Canvas obj's underlying member method code with example usage: obj.on_mouse_release(event) without return types