Re: [igraph] Is it possible to use igraph in Java?

[Chris Wj]

There are enough java graph visualization tools floating around already, and many of them open up the standard graph files that igraph generates. This is where igraph would benefit from a way to write graph files to any file like object instead of just to a file on disk. I think you should go the python or C++ route and forego the java, but that's just my opinion (I'm not the java lover). If you want some cool visualization check out UbiGraph; it's really simple to use. I'd love to write an igraph interface for it.

On Thu, Apr 2, 2009 at 12:25 PM, Tamas Nepusz <address@hidden> wrote:

Could rJava be used to interface with R, which calls igraph?
http://www.rforge.net/rJava/

I guess rJava works the other way round; i.e., it allows you to access Java objects from R.

Another idea, I'm not sure I need full integration.  Could an output layout be written that includes the x,y,z coords for each node/edge, so that it could be imported into a java app and plotted?

Do you mean that you want to generate a layout with igraph, save the coordinates and then use that to plot something in Processing? That should be simple; assuming that g is your graph in Python, you can simply do as follows:

from igraph import *

# Construct your graph here

layout = g.layout("kamada_kawai_3d")
f = file("layout.txt", "w")
for x, y, z in layout:
 print >>f, x, y, z
f.close()


You can also construct a Python script that simply writes the coordinates to stdout and then call it from Java and read the output of the Python script directly.

--
Tamas



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