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

[Enrico Persiani <enrico.persiani@xxxxxxxxxxx>]

Hi Ken,

this is a method I use to convert a GraphicalPart to an Image:

public static Image createImage(GraphicalEditPart part) {

IFigure figure = part.getFigure();

Rectangle figureBounds = figure.getBounds();

Control figureCanvas = part.getViewer().getControl();

double scale = ((ScalableRootEditPart) part.getViewer().getRootEditPart()).getZoomManager().getZoom();

// calculate feedback maximum dimension

Dimension dimension = new Dimension((int) Math.round(figureBounds.width*scale),

(int) Math.round(figureBounds.height*scale));

Image img = new Image(null, dimension.width, dimension.height);

img.setBackground(ColorConstants.white);

GC imageGC = new GC(img);

Graphics imgGraphics = new SWTGraphics(imageGC);

imgGraphics.scale(scale);

imgGraphics.translate(-figureBounds.x, -figureBounds.y);

figure.paint(imgGraphics);

ImageData data = img.getImageData();

Image feedbackImage = new Image(figureCanvas.getDisplay(), data);

imageGC.dispose();

img.dispose();

return feedbackImage;

}

you can save it using this one:

public static void saveImageFile(File file, Image image) throws IOException, FileNotFoundException {

ImageLoader loader = new ImageLoader();

loader.data = new ImageData[] {image.getImageData()};

OutputStream os = new FileOutputStream(file);

loader.save(os, SWT.IMAGE_PNG);

os.close();

}

Regards,

Enrico Persiani

2014-07-11 22:40 GMT+02:00 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.

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Enrico Persiani

Software Engineer

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F: +39 051 19902276

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