class_docstr: A helper class to figure out the range of grid lines that need to be drawn.
class_docstr_tok: ["A","helper","class","to","figure","out","the","range","of","grid","lines","that","need","to","be","drawn","."]
docstr: Perform the padding mentioned in `__call__`.
docstr_tok: ["Perform","the","padding","mentioned","in","`","__call__","`","."]
code: def _add_pad(self, x_min, x_max, y_min, y_max):
      """Perform the padding mentioned in `__call__`."""
      dx = (x_max - x_min) / self.nx
      dy = (y_max - y_min) / self.ny
      return x_min - dx, x_max + dx, y_min - dy, y_max + dy
  
imports: import numpy
  from matplotlib import ticker, _api
  from matplotlib.transforms import Bbox, Transform
label_desc: Use image node_id 3 for calling the ExtremeFinderSimple obj's underlying member method code with example usage: obj._add_pad(x_min, x_max, y_min, y_max) and returns: unknown,  unknown,  unknown,  unknown