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Render in-memory GMF Diagram on a SWT Composite/Canvas [message #697037]

Fri, 15 July 2011 11:26

Erdal Karaca

Messages: 853
Registered: July 2009

Senior Member

I would like to render a GMF diagram on a SWT Composite at run time, i.e. the diagram is read from a file/db/... and needs to be visualized.
Moreover, I need to be able to change the figure properties (e.g. background color) programmatically once it has been rendered.

It is a BPMN diagram from the BPMN project which has an gmf editor, but I do not need the editing functionality at run time.
I am not familiar with gmf, just a basic understanding of it: Is rendering a gmf diagram decoupled from its editor possible? Any examples?

I could figure out how the Export to Image operations work, but I need to be able to select single figures of the diagram once it has been rendered...

[Updated on: Fri, 15 July 2011 11:30]

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Re: Render in-memory GMF Diagram on a SWT Composite/Canvas [message #697064 is a reply to message #697037]

Fri, 15 July 2011 12:58

Erdal Karaca

Messages: 853
Registered: July 2009

Senior Member

When using the method org.eclipse.gmf.runtime.diagram.ui.render.util.DiagramRenderUtil.renderToSWTImage(Diagram) to generate an SWT image, I get the following Exception:

Caused by: java.lang.NullPointerException
at org.eclipse.gmf.runtime.diagram.core.listener.DiagramEventBroker.initializeDiagramEventBroker(DiagramEventBroker.java:243)
at org.eclipse.gmf.runtime.diagram.core.listener.DiagramEventBroker.startListening(DiagramEventBroker.java:230)
at org.eclipse.gmf.runtime.diagram.ui.OffscreenEditPartFactory.createDiagramEditPart(OffscreenEditPartFactory.java:126)
at org.eclipse.gmf.runtime.diagram.ui.OffscreenEditPartFactory.createDiagramEditPart(OffscreenEditPartFactory.java:77)
at org.eclipse.gmf.runtime.diagram.ui.render.util.DiagramRenderUtil.renderToSWTImage(DiagramRenderUtil.java:79)
at aero.pag.praesto.workflows.WorkflowDiagramRenderer.renderWorkflow(WorkflowDiagramRenderer.java:94)

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