planar-dual

Given a planar embedding of a graph, find all faces.

var getFaces = require("planar-dual")

//Create a triforce
var positions = [
  [0, 0],
  [-1, -1],
  [0, 1],
  [1, -1]
]
var edges = [
  [1, 2],
  [2, 3],
  [3, 1],
  [0, 1],
  [0, 2],
  [0, 3]
]

//Compute dual graph
console.log(getFaces(edges, positions))

Output:

[ [ 0, 1, 2 ], [ 0, 2, 3 ], [ 0, 3, 1 ], [ 1, 3, 2 ] ]

npm install planar-dual

require("planar-dual")(edges, positions)

Splits an embedded planar graph into a collection of faces

• edges are the edges of the graph
• positions are the locations of the vertices of the graph

Returns A list of faces of the graph represented as ordered lists of vertices(c) 2014 Mikola Lysenko. MIT License