rescale_vertex_igraph: Rescale vertex size to be used in 'plot.igraph'.

In USCCANA/netdiffuseR: Analysis of Diffusion and Contagion Processes on Networks

Rescale vertex size to be used in plot.igraph.

Description

This function rescales a vertex size before passing it to plot.igraph so that the resulting vertices have the desired size relative to the x-axis.

Usage

rescale_vertex_igraph(
  vertex.size,
  par.usr = par("usr"),
  minmax.relative.size = getOption("diffnet.minmax.relative.size", c(0.01, 0.04)),
  adjust = 200
)

igraph_vertex_rescale(
  vertex.size,
  par.usr = par("usr"),
  minmax.relative.size = getOption("diffnet.minmax.relative.size", c(0.01, 0.04)),
  adjust = 200
)

vertex_rescale_igraph(
  vertex.size,
  par.usr = par("usr"),
  minmax.relative.size = getOption("diffnet.minmax.relative.size", c(0.01, 0.04)),
  adjust = 200
)

Arguments

vertex.size	Numeric vector of unscaled vertices' sizes. This is unit-free.
par.usr	Integer vector of length 4 with the coordinates of plotting region. by default uses par("usr").
minmax.relative.size	A numeric vector of length 2. Represents the desired min and max vertex sizes relative to the x-axis in terms of percentage (see details).
adjust	Numeric scalar. Adjustment made to the resulting adjusted size (see details).

Details

minmax.relative.size limits the minimum and maximum size that a vertex can take in the plot relative to the x-axis scale. The values for the x-axis scale are by default retrieved by accessing to par("usr"). By default the vertex are rescaled to be at least 1% of the size of the plotting region and no more than 5% of the plotting region, minmax.relative.size=c(.01, .05).

The default value for adjust is taken from igraph version 1.0.1. In particular, the function igraph:::.igraph.shape.circle.plot, in which before passing the vertex.size to the function symbols, the vertex size is reduced by 200.

The rescaling is as follows:

% v' = \frac{v - \underbar v}{\bar v - \underbar v}\times (\bar s - \underbar s) + \underbar s

Where v is the vertex size, \bar v and \underbar v are the max and min values of v respectively, and \bar s and \underbar s are the max and min size that vertices take in terms of minmax.relative.size and par.usr. The adjusted value v' is then multiplied by adjust.

igraph_vertex_rescale and vertex_rescale_igraph are aliases.

Value

An integer vector of the same length as vertex.size with rescaled values.

Author(s)

George G. Vega Yon

See Also

Other visualizations: dgr(), diffusionMap(), drawColorKey(), grid_distribution(), hazard_rate(), plot_adopters(), plot_diffnet2(), plot_diffnet(), plot_infectsuscep(), plot_threshold()

Examples

library(igraph)

# Random graph and coordinates
set.seed(2134)
g <- barabasi.game(10)
coords <- layout_nicely(g)

# Random size and figures
size <- runif(10)
size <- cbind(size, size)
shap <- sample(c("circle", "square"),10,TRUE)

# Plotting
oldpar <- par(no.readonly = TRUE)
par(mfrow=c(2,2), mai=rep(.5,4))
for (i in seq(1, 1000, length.out = 4)) {
  # New plot-window
  plot.new()
  plot.window(xlim=range(coords[,1]*i), ylim=range(coords[,2]*i))

  # plotting graph
  plot(g, layout=coords*i, add=TRUE, rescale=FALSE,
       vertex.shape = shap,
       vertex.size  = rescale_vertex_igraph(size) # HERE WE RESCALE!
  )

  # Adding some axis
  axis(1, lwd=0, lwd.ticks = 1)
  axis(2, lwd=0, lwd.ticks = 1)
  box()
}

par(oldpar)

USCCANA/netdiffuseR documentation built on Sept. 5, 2023, 12:31 a.m.