JUNG: Saving graph into image file

Question

I use JUNG to visualize my graph / network. Now i want to save the graph (as seen in the VisualizationViewer) in a image file. I use the paint() / paintAll() function of the VisualizationViewer (who extend JPanel). But with this function, only the part who is actually shown in the VisualizationViewer (for example after zooming in) is in the image. I want to draw all Vertexes and Edges. Is there a way to draw all Elements?

Have you checked the following SO post? [Exporting JUNG graphs to hi-res images (preferably vector based)](http://stackoverflow.com/questions/8518390/exporting-jung-graphs-to-hi-res-images-preferably-vector-based) — ecle, Jan 21 '12 at 10:10
Dont help, because he will save save only the part shown in the vv, e.g. after zoom in/out.For Vector based output i use Batik. — Thargor, Jan 23 '12 at 10:54
Who is "he" you are referring to? How about the rest of the solutions for the given post? — ee., Jan 25 '12 at 01:32
I can save the part of the graph i see as PNG and SVG, that is no problem. The problem is, that i want so save the whole graph not only a part of it. And this problem is not part of the solution in the given post. In the meantime i think it exist no "simple" solution. I need to write my own functions. — Thargor, Jan 25 '12 at 08:15
There is a sample source code `VisualizationImageServerDemo` from **jung-samples-2.0.1.jar** which uses `VisualizationImageServer` class to save the graph at a defined size and position: `Image im = vv.getImage(new Point2d.Double(300,300), new Dimension(600,600));` — ee., Jan 26 '12 at 03:00
I know this example. Here the problem is, that VisualizationImageServer dont support all methodes i use with VisualizationViewer (like all renderer). So i can't replace my VisualizationViewer with VisualizationImageServer. But i will look at the getImage() function, maybe there is my solution. — Thargor, Jan 26 '12 at 12:52
Facing the same problem, did you come up with a solution @Thargor? — Zakum, Jul 30 '18 at 16:24
@Zakum i stoped working years ago on that project. but as i remeber, i found no solution. — Thargor, Dec 14 '18 at 08:26
@Thargor Oh, I forgot all about this, too. Managed to make it work using the freehp.hraphicsIO library: http://java.freehep.org/vectorgraphics/ I'll post the solution below for posteriority. — Zakum, Dec 18 '18 at 14:07

score 1 · Accepted Answer · answered Dec 18 '18 at 14:20

I found a solution using the freeHEP library and JUNG's VisualizationImageServer:

private void doSaveAs() throws IOException {
    // instantiate and configure image-able visualization viewer
    VisualizationImageServer<Vertex, Edge> vis =
            new VisualizationImageServer<Vertex, Edge>(this.visViewer.getGraphLayout(),
                                                       this.visViewer.getGraphLayout().getSize());

    setUpAppearance(vis);

    ExportDialog export = new ExportDialog();
    export.showExportDialog(vis, "Export view as ...", vis, "export");
}

When called, this will open an export dialog to the user, where directory and filetype can be selected.

In this snippet, ExportDialog is org.freehep.graphicsbase.util.export.ExportDialog, which you would have to somehow get to your build path, in my case using maven by adding freehep-graphicsio to my pom file.

The field this.visViewer contains your regular VisualizationViewer instance, that you would also use for displaying your graph.

The method setUpAppearance(vis); performs the same setup that I do on the VisualizationViewer instance for displaying purposes. Here's an example, the details will probably vary for you:

private void setUpAppearance(BasicVisualizationServer<Vertex, Edge> vis) {
    vis.setBackground(BGCOLOR);
    vis.setPreferredSize(new Dimension(1500, 600)); // Sets the viewing area

    // modify vertices
    vis.getRenderContext().setVertexLabelTransformer(new ToStringLabeller());
    vis.getRenderContext().setVertexFontTransformer(Transformers.vertexFontTransformer);
    vis.getRenderContext().setVertexShapeTransformer(Transformers.vertexShapeTransformer);
    vis.getRenderContext().setVertexFillPaintTransformer(Transformers.vertexFillPaintTransformer);
    vis.getRenderContext().setVertexDrawPaintTransformer(Transformers.vertexDrawPaintTransformer);
    vis.getRenderer().getVertexLabelRenderer().setPosition(Position.CNTR);

    // modify edges
    vis.getRenderContext().setEdgeShapeTransformer(Transformers.edgeShapeTransformer);
    vis.getRenderContext().setEdgeDrawPaintTransformer(Transformers.edgeDrawPaintTransformer);
    vis.getRenderContext().setArrowDrawPaintTransformer(Transformers.edgeDrawPaintTransformer);
    vis.getRenderContext().setArrowFillPaintTransformer(Transformers.edgeDrawPaintTransformer);
    vis.getRenderContext().setEdgeArrowPredicate(Transformers.edgeArrowPredicate);
    vis.getRenderContext().setEdgeStrokeTransformer(Transformers.edgeStrokeHighlightingTransformer);
}

As a last step you need to figure out when doSaveAs should be called. For instance you could add a Button on the UI for that.

score 1 · Answer 2 · answered Jan 19 '12 at 16:01

1

I don't know anything about JUNG, but it is just extends a JPanel to do the painting then you should be able to use the Screen Image class to create an image of any component.

answered Jan 19 '12 at 16:01

camickr

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Dont work. VisualizationViewer is a Element to visualize a network / graph. If in zoom into the graph i see only a part of it and all Methodes save only these part into the Image. – Thargor Jan 20 '12 at 12:14

JUNG: Saving graph into image file

2 Answers2