edge_bundle_stub {edgebundle}

stub edge bundling

Description

Implements the stub edge bundling by Nocaj and Brandes

Usage

edge_bundle_stub(
  object,
  xy,
  alpha = 11,
  beta = 75,
  gamma = 40,
  t = 0.5,
  tshift = 0.5
)

Arguments

object

a graph object (igraph/tbl_graph). Does not support network objects

xy

coordinates of vertices

alpha

maximal angle (in degree) between consecutive edges in a bundle

beta

angle (in degree) at which to connect two stubs

gamma

maximal overall angle (in degree) of an edge bundle

t

numeric between 0 and 1. control point location

tshift

numeric between 0 and 1. The closer to one, the longer the bigger bundle

Details

see online for plotting tips

Value

data.frame containing the bundled edges

Author(s)

David Schoch

References

Nocaj, Arlind, and Ulrik Brandes. "Stub bundling and confluent spirals for geographic networks." International Symposium on Graph Drawing. Springer, Cham, 2013.

See Also

edge_bundle_hammer,edge_bundle_force, edge_bundle_path

Examples

library(igraph)
g <- graph.star(10, "undirected")

xy <- matrix(c(
    0, 0,
    cos(90 * pi / 180), sin(90 * pi / 180),
    cos(80 * pi / 180), sin(80 * pi / 180),
    cos(70 * pi / 180), sin(70 * pi / 180),
    cos(330 * pi / 180), sin(330 * pi / 180),
    cos(320 * pi / 180), sin(320 * pi / 180),
    cos(310 * pi / 180), sin(310 * pi / 180),
    cos(210 * pi / 180), sin(210 * pi / 180),
    cos(200 * pi / 180), sin(200 * pi / 180),
    cos(190 * pi / 180), sin(190 * pi / 180)
), ncol = 2, byrow = TRUE)

edge_bundle_stub(g, xy)
# use ggforce::geom_bezier for plotting