code: def __call__(self, v1, v2):
      v1, v2 = sorted([v1, v2])
      locs = np.array([l for l in self._locs if v1 <= l <= v2])
      return locs, len(locs), 1
  
imports: import numpy
  from matplotlib import ticker
  from matplotlib.transforms import Bbox, Transform
label_desc: Use image node_id 2 for calling the FixedLocator obj's underlying member method code with example usage: obj.__call__(v1, v2) and returns: locs,  len,  int