//Init a project - and therefore a workspace
ProjectController pc = Lookup.getDefault().lookup(ProjectController.class);
pc.newProject();
Workspace workspace = pc.getCurrentWorkspace();
 
//Import file
ImportController importController = Lookup.getDefault().lookup(ImportController.class);
Container container;
try {
    File file = new File(getClass().getResource("/org/gephi/toolkit/demos/resources/Java.gexf").toURI());
    container = importController.importFile(file);
} catch (Exception ex) {
    ex.printStackTrace();
    return;
}
 
//Append imported data to GraphAPI
importController.process(container, new DefaultProcessor(), workspace);
 
//Preview configuration
PreviewController previewController = Lookup.getDefault().lookup(PreviewController.class);
PreviewModel previewModel = previewController.getModel();
previewModel.getProperties().putValue(PreviewProperty.SHOW_NODE_LABELS, Boolean.TRUE);
previewModel.getProperties().putValue(PreviewProperty.NODE_LABEL_COLOR, new DependantOriginalColor(Color.WHITE));
previewModel.getProperties().putValue(PreviewProperty.EDGE_CURVED, Boolean.FALSE);
previewModel.getProperties().putValue(PreviewProperty.EDGE_OPACITY, 50);
previewModel.getProperties().putValue(PreviewProperty.EDGE_RADIUS, 10f);
previewModel.getProperties().putValue(PreviewProperty.BACKGROUND_COLOR, Color.BLACK);
previewController.refreshPreview();
 
//New Processing target, get the PApplet
ProcessingTarget target = (ProcessingTarget) previewController.getRenderTarget(RenderTarget.PROCESSING_TARGET);
PApplet applet = target.getApplet();
applet.init();
 
//Refresh the preview and reset the zoom
previewController.render(target);
target.refresh();
target.resetZoom();
 
//Add the applet to a JFrame and display
JFrame frame = new JFrame("Test Preview");
frame.setLayout(new BorderLayout());
 
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add(applet, BorderLayout.CENTER);
 
frame.pack();
frame.setVisible(true);