netplot: netplot-formulae – R documentation

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netplot-formulae

Formulas in netplot

Description

Edge colors in both nplot() and set_edge_gpar() can be specified using a formula based on ego() and alter() (source and target). This way the user can set various types of combination varying the mixing of the colors, the alpha levels, and the actual mixing colors to create edge colors.

Usage

color_formula(x, col, alpha, env, type, mix = 1, postfix = NULL)

ego(...)

alter(...)

Arguments

`x`	An object of class netplot.
`col`	Any valid color. Can be a single color or a vector.
`alpha`	Number. Alpha levels
`env, type, postfix`	For internal use only.
`mix`	Number. For mixing colors between `ego` and `alter`
`...`	Passed to `color_formula`.

Value

Nothing. These functions are called internally when using formulas. color_formula modifies the environment env.

Examples

if (require(gridExtra) & require(magrittr)) {
  library(igraph)
  net <- make_ring(4)

  set.seed(1)
  np <- nplot(net, vertex.color = grDevices::hcl.colors(4), vertex.size.range=c(.1, .1))
  np %<>% set_edge_gpar(lwd = 4)

  grid.arrange(
    np,
    np %>% set_edge_gpar(col =~ego + alter),
    np %>% set_edge_gpar(col =~ego(alpha=0) + alter),
    np %>% set_edge_gpar(col =~ego + alter(alpha=0)),
    np %>% set_edge_gpar(col =~ego(mix=0) + alter(mix=1)),
    np %>% set_edge_gpar(col =~ego(mix=1) + alter(mix=0))
  )
}

netplot

Beautiful Graph Drawing

v0.1-1

MIT + file LICENSE

Authors

George Vega Yon [aut, cre] (<https://orcid.org/0000-0002-3171-0844>)

Initial release