Layout a graph on a spiral

Usage

layout_as_spiral(
  g,
  type = c("Archimedean", "Bernoulli", "Fermat", "Euler"),
  arcs = 6,
  a = 1,
  b = NULL,
  rev = FALSE
)

Arguments

g: An igraph object. If (rev = FALSE) the vertex with the lowest index will be placed in the centre of the spiral, the highest index will be most outer vertex,
type: Spiral type, one of "Archimedean","Bernoulli","Fermat", or, "Euler" (default = "Archimedean")
arcs: The number of arcs (half circles/ovals) that make up the spiral (default = 10)
a: Parameter controlling the distance between spiral arms, however, the effect will vary for different spiral types (default = 0.5)
b: Parameter controlling where the spiral originates. A value of 1 will generally place the origin in the center. The default NULL will choose a value based on the different spiral types (default = NULL)
rev: If TRUE the vertex with the highest index will be placed in the centre of the spiral (default = FALSE)

Value

An igraph layout

Examples


library(igraph)
#> 
#> Attaching package: ‘igraph’
#> The following objects are masked from ‘package:stats’:
#> 
#>     decompose, spectrum
#> The following object is masked from ‘package:base’:
#> 
#>     union

g  <- igraph::sample_gnp(100, 1/100)

# Equiangular spiral: Any line from the origin cuts at the same angle.
plot(g, layout = layout_as_spiral(g, type = "Bernoulli", arcs = 5))


# The arms of Fermat's spiral diverge quadratically.
plot(g, layout = layout_as_spiral(g, type = "Fermat", arcs = 5))


# Equidistance of intersection points along a line through the origin.
plot(g, layout = layout_as_spiral(g, type = "Archimedean", arcs = 5))