Re: [jgrapht-users] Using GML Exporter to export a java file to a GML file

[H.N. de R. <hnr...@gr...>]

On Wed, Jun 20, 2012 at 08:37:43AM -0700, rima asmar wrote:

Hello Rima,

> Can u plz give me a simple example of how i can use the
> ComponentAttributeProvider !! I could do the exporting to .dot, but with no
> attributes at all, so do i add the attributes to the .dot file?

Check the test code for DOTExporter:

    public void testUndirected()
    {
        UndirectedGraph<String, DefaultEdge> g =
            new SimpleGraph<String, DefaultEdge>(DefaultEdge.class);
        g.addVertex(V1);
        g.addVertex(V2);
        g.addEdge(V1, V2);
        g.addVertex(V3);
        g.addEdge(V3, V1);

        StringWriter w = new StringWriter();
        ComponentAttributeProvider<String> vertexAttributeProvider =
            new ComponentAttributeProvider<String>() {
                public Map<String, String> getComponentAttributes(String v)
                {
                    Map<String, String> map =
                        new LinkedHashMap<String, String>();
                    if (v.equals(V1)) {
                        map.put("label", "a");
                    } else if (v.equals(V2)) {
                        map.put("x", "y");
                    } else {
                        map = null;
                    }
                    return map;
                }
            };

        DOTExporter<String, DefaultEdge> exporter =
            new DOTExporter<String, DefaultEdge>(
                new IntegerNameProvider<String>(),
                null,
                null,
                vertexAttributeProvider,
                null);
        exporter.export(w, g);
    }

In your case you would want something like map.put("shape", "polygon") instead of map.put("label", "a").

Regards,
   Ernst

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