class_docstr: The classic Sugiyama layout aka layered layout.
  
  - See https://en.wikipedia.org/wiki/Layered_graph_drawing
  - Excellent explanation: https://www.youtube.com/watch?v=Z0RGCWxvCxA
  
  
  **Attributes**
      - dirvh (int): the current aligment state for alignment policy:
               dirvh=0 -> dirh=+1, dirv=-1: leftmost upper
               dirvh=1 -> dirh=-1, dirv=-1: rightmost upper
               dirvh=2 -> dirh=+1, dirv=+1: leftmost lower
               dirvh=3 -> dirh=-1, dirv=+1: rightmost lower
      - order_iter (int): the default number of layer placement iterations
      - order_attr (str): set attribute name used for layer ordering
      - xspace (int): horizontal space between vertices in a layer
      - yspace (int): vertical space between layers
      - dw (int): default width of a vertex
      - dh (int): default height of a vertex
      - g (GraphBase): the graph component reference
      - layers (list[sugiyama.layer.Layer]): the list of layers
      - layoutVertices (dict): associate vertex (possibly dummy) with their sugiyama attributes
      - ctrls (dict): associate edge with all its vertices (including dummies)
      - dag (bool): the current acyclic state
      - init_done (bool): True if things were initialized
  
  **Example**
  
      ::
  
          g = nx.generators.connected_watts_strogatz_graph(1000, 2, 0.3)
          # render
          SugiyamaLayout.draw(g)
          # positions
          positions_dictionary = SugiyamaLayout.arrange(g)
docstr: iterator that computes all vertices ordering in their layers
  (one layer after the other from top to bottom, to top again unless
  oneway is True).
docstr_tok: ["iterator","that","computes","all","vertices","ordering","in","their","layers","(","one","layer","after","the","other","from","top","to","bottom",",","to","top","again","unless","oneway","is","True",")","."]
code: def ordering_step(self, oneway=False):
      """iterator that computes all vertices ordering in their layers
      (one layer after the other from top to bottom, to top again unless
      oneway is True).
      """
      self.dirv = -1
      crossings = 0
      layer = None
      for layer in self.layers:
          mvmt = layer.order()
          crossings += mvmt
          yield (layer, mvmt)
      if oneway or (crossings == 0):
          return
      self.dirv = +1
      while layer:
          mvmt = layer.order()
          yield (layer, mvmt)
          layer = layer.nextlayer()
  
imports: import pandas, typing
  from sys import getrecursionlimit, setrecursionlimit
  from graphistry.layout.graph import Vertex, GraphBase, Graph, Edge
  from graphistry.layout.utils import DummyVertex, LayoutVertex, Rectangle, size_median
  from graphistry.layout.utils.layer import Layer
label_desc: Use image node_id 24 for calling the SugiyamaLayout obj's underlying member method code with example usage: obj.ordering_step(oneway) without return types