class_docstr: Funnel graph class
class_docstr_tok: ["Funnel","graph","class"]
code: def _center(self, x):
      return x - 1 / (2 * self._order)
  
file_path: pygal/pygal/graph/funnel.py
imports: from pygal.adapters import none_to_zero, positive
  from pygal.graph.graph import Graph
  from pygal.util import alter, cut, decorate
label_desc: Use image node_id 3 for calling the Funnel obj's underlying member method code with example usage: obj._center(x) and returns: unknown