[vtkusers] Graph Layout with OGDF

[Colin Myers]

I recently discovered that the Open Graph Drawing Framework (OGDF) has a 
very nice selection of layout algorithms. I've created a 
vtkGraphLayoutStrategy that 'wraps' OGDF layout so they can be used in a VTK pipeline.

I've attached the source here in case someone finds it useful. The OGDF 
library can be found here: http://www.ogdf.net/doku.php/tech:download Regards,
Colin
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