[gef-dev] Trying to export a GEF diagram as a PNG without displaying it

[Ken Keefe <kjkeefe@xxxxxxxxx>]

I've been trying to figure out a GEF issue for about a month now and I'm not getting anywhere. I have tried other discussion venues first, but I'm hoping someone here can assist. I have a GEF diagram that I want to save directly to a PNG file. I need to do this without displaying the diagram graphically (actually, it needs to work when the RCP app is running headlessly). 

Here is the code I have so far:

final File pngFile = new File(docDir, getParent().getName()+".png");

Display.getDefault().asyncExec(new Runnable() {

@Override

public void run() {

GraphicalViewer viewer = new ScrollingGraphicalViewer();

viewer.setEditPartFactory(new AttackExecutionModelEditPartFactory());

ScalableFreeformRootEditPart rootPart = new ScalableFreeformRootEditPart();

viewer.setRootEditPart(rootPart);

viewer.setContents(getCastedModel().getAeg());

IFigure rootFigure = ((LayerManager)rootPart).getLayer(LayerConstants.PRINTABLE_LAYERS);

Rectangle rootFigureBounds = rootFigure.getBounds();

viewer.createControl(new Shell());

viewer.flush();

Control figureCanvas = viewer.getControl();

// The bounds are (0,0) at this point, so let's change them and see if the rest of the code works...

rootFigureBounds.height = 1000;

rootFigureBounds.width = 1000;

Image img = new Image(Display.getDefault(), rootFigureBounds.width, rootFigureBounds.height);

GC imageGC = new GC(img);

figureCanvas.print(imageGC);

ImageLoader imgLoader = new ImageLoader();

imgLoader.data = "" ImageData[] { img.getImageData() };

imgLoader.save(pngFile.getAbsolutePath(), SWT.IMAGE_PNG);

}

});

I get a 1000x1000 white PNG file out of it. Any suggestions would be VERY welcome. I've run out of ideas at this point.

Thanks,

Ken Keefe

--
Forti et Fordeli nihil difficile – Nothing is difficult to the brave and faithful.