Re: Leveraging the SpringBox algorithm to read out location data for own visualization

[guilhelm savin <guilhelm.savin AT gmail.com>]

Hi Nils,

I think you are looking for this method https://data.graphstream-project.org/api/gs-algo/current/org/graphstream/algorithm/Toolkit.html#computeLayout(org.graphstream.graph.Graph,%20org.graphstream.ui.layout.Layout,%20double)

It will compute the layout on the given graph, and coordinates will be available in nodes attributes.

Guilhelm

Le ven. 22 févr. 2019 à 05:51, Nils Peuser <Nils.Peuser AT igrafx.com> a écrit :

Dear GraphStream users,

I am currently trying to leverage the GraphStream API for some graph analysis and so far like the library very much. While I have a Java-based program, I would like my visualization to take on a different format, not rendered by Java itself. I was trying to get the SpringBox Layout algorithm to work with a programmaticly created MultiGraph. However, I was not able to do so and read out the currently calculated x/y (no need for a 3d layout) coordinates from the Node attributes. I was trying to dig into the source of SpringBox/BarnesHut.java as well was the LayoutRunner/Viewer mechanism but that was a little bit more than I was hoping to have to investigate to simply apply a force-based layout algorithm.

Could someone point me how to do this in a headless environment where I have no access to Java Graphics? Here's example code/pseudo code:

---------

MultiGraph graph = new MultiGraph("derp", false, true);

SpringBox sb = new SpringBox(false);

      sb.addSink(graph);

      for(int i = 0; i < 100; ++i)

      {

         sb.compute();

      }

      // Read out calculated coordinates

     ???  Node attributes don't work here it seems.

-------------------

Nils Peuser DevOps Engineering Manager

iGrafx  7585 SW Mohawk St  Tualatin, Oregon  Office: +1 (503) 404-6027  www.igrafx.com  Twitter | LinkedIn

 

 

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