[igraph] extracting x y values from an igraph object to plot in ggplot

[Roey Angel]

Hi,
I'd like to extract the x y values from an igraph object in order to 
plot it in ggplot (which accepts only data frames).
Scott Chamberlain has published an attempt to plot igraph networks in 
ggplot 
(http://schamberlain.github.com/2011/03/basic-ggplot2-network-graphs/) 
but he's just generating random values for the position of the vertices 
(through the vplace variable).
This works fine for small networks but makes a clutter in large networks 
and, most importantly, doesn't allow drawing different layouts.

The reason I'm insisting on ggplot (apart from the fact that this is 
what I know best in R graphics) is because I'd like to have the vertices 
sized according to a vector of numeric values and their colours 
according to a character vector and that's done very easly in ggplot.

I'm a beginner and trying to figure out my way in the world of networks 
and igraph so there might be something very basic I'm missing out here.

Thanks a lot in advance,
Roey

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