PNG images as vertices in R (igraph)

Question

[R help]

Hello, is there any way to use png images as vertices in R? Specifically while still using the igraph package?

For example I have some PNG images 1.png 2.png 3.png

Can I replace certain vertices with 1.png, others with 2.png, and the rest with 3.png?

There is actually a much simpler way, see my answer. – Gabor Csardi Jan 29 '14 at 14:53 — Gabor Csardi, Jan 29 '14 at 14:53

score 2 · Accepted Answer · answered Jan 29 '14 at 14:55

This is simple with the new raster vertex shape:

library(png)
library(igraph)

# To get an image to plot
imgfilename <- file.path(tempdir(), "igraph2.png")
imgfile <- download.file("http://igraph.sourceforge.net/images/igraph2.png",
                         destfile=imgfilename)
img <- readPNG(imgfilename)

g <- graph.ring(10)
# This is a complex attribute, so supply a list here
V(g)$raster <- replicate(vcount(g), img, simplify=FALSE)
plot(g, vertex.shape="raster", vertex.label=NA,
     vertex.size=1:10*5, vertex.size2=1:10*5)

screenshot of plot

PNG images as vertices in R (igraph)

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