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?
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.