FaceView

class FaceView(nodes)

Bases: NodeView

View over faces (regions) of a planar diagram.

A face (region, area) is modeled as a sequence of endpoints. Given a face on the plane, its boundary is returned by traversing in CCW fashion, using the target (second) endpoint at each step.

Parameters:

nodes (dict[Hashable, Node])

__init__(nodes)

Create a view over the given node mapping.

Parameters:

nodes (dict[Hashable, Node]) – Mapping from node id → Node instance.

Return type:

None

Methods

__init__(nodes)	Create a view over the given node mapping.
arcs(node)	Return the arcs emanating from a node.
get(k[,d])
isdisjoint(other)	Return True if two sets have a null intersection.
items()
keys()
values()

arcs(node)

Return the arcs emanating from a node.

Each arc is returned as a pair (adjacent_endpoint, endpoint).

Parameters:

node (Hashable) – Node identifier.

Returns:

list[tuple[Endpoint, Endpoint]] – List of arcs from the node.

Return type:

list[tuple[Endpoint, Endpoint]]

get(k[, d]) → D[k] if k in D, else d.  d defaults to None.

isdisjoint(other)

Return True if two sets have a null intersection.

items() → a set-like object providing a view on D's items

keys() → a set-like object providing a view on D's keys

values() → an object providing a view on D's values