[igraph] Determining exact coordinates for a drawn graph in Python

[Alexander Tsiatas]

Hello,

I am using the igraph package (with Python) for graph 
drawing, and I have a question about the treatment of coordinates when 
drawing graphs. I am drawing a graph with specified coordinates, created
 by calling igraph.Layout(coords). I can draw the graph fine, but it 
seems like the coordinates that are specified do not end up being 
exactly the coordinates used - they must be scaled or stretched somehow,
 even when I use bbox=layout.bounding_box() in igraph.plot(). I thought 
that this would use my exact coordinates, since I am using the bounding 
box from my coordinates, but it seems like they are being modified 
somehow, and I can't figure out how exactly they are changed.

I am looking for the exact coordinates because I am overlaying my 
graph drawing with a Voronoi diagram, and I am using the coordinates 
that I specified as input. Is there any way to programmatically 
transform my specified layout coordinates into the eventual point 
locations, so I can use the actual coordinates in my Voronoi diagram?

Thanks in advance.
-Alex