• Implement an ILayoutSetup (see e.g. GmfLayoutSetup) and register it with the org.eclipse.elk.core.service.layoutConnectors extension point.
  
• In the Guice Module returned by your setup, bind DiagramLayoutEngine to a new subclass (e.g. CustomDiagramLayoutEngine).
  
• In CustomDiagramLayoutEngine, override addDiagramConfig(Parameters, LayoutMapping) to add your configuration code.
  

@Override
protected void addDiagramConfig(Parameters params, LayoutMapping layoutMapping) {
    LayoutConfigurator layoutConfigurator = params.addLayoutRun();
    // Put your configuration code here
    ...
    super.addDiagramConfig(params, layoutMapping);
}

Is there any example project for this kind of 'Configuration'? I would like to know more about it.

Can I use this ElkUtil.applyVisitors(graph, configurator) before the DiagramLayoutEngine.invokeLayout() ?

Miro Spönemann.

Can I use this ElkUtil.applyVisitors(graph, configurator) before the DiagramLayoutEngine.invokeLayout() ?

It looks different with 'Advanced Configuration'.

LayoutConfigurator configurator = new LayoutConfigurator();

// Configure layout options for a concrete graph object
configurator.configure(myVerySpecialNode)
    .setProperty(CoreOptions.INTERACTIVE, true)
    .setProperty(CoreOptions.PORT_CONSTRAINTS, PortConstraints.FIXED);
....

DiagramLayoutEngine.Parameters params = new DiagramLayoutEngine.Parameters();
params.addLayoutRun(configurator);
DiagramLayoutEngine.invokeLayout(workbenchPart, diagramPart, params);