RE: painting Scene to BufferedImage

hi David,

 

The reason behind the need to do this is that I want to use Widgets as icons for Nodes in other windows on the platform, and the Node interface uses java.awt.Image for it's icons. The widgets are programmatically generated from my object model so I don't want it the other way around (using ImageWidget's to show the Node icons).

 

If it were possible to add this to Scene that would be great for my application but hopefully would be useful to other users as it would help integrating the visual library with the Nodes / Explorer modules in this way.

 

thanks

 

Pete

---

Hi Peter,

The whole issue is that the scene view has to be created and shown to
get correct font-metrics ... It means the "addNotify" method of the
JComponent scene view has to be called be Swing. Only then the scene
knows correct font-metrics...

Therefore it is not possible to solve your use-case now.

Let me know, it is really necessary to work "off-screen". If so, then we
can add a new method:
// the method name is weird so we can propose better one
public final void Scene.forceValidate (Graphics2D graphics) {
        Graphics2D prevoiusGraphics = getGraphics ();
        setGraphics (graphics);
        validate ();
        setGraphics (prevoiusGraphics);
}

In your use-case you would just call:
// create an empty image
myScene.forceValidate (myEmptyImageGraphics);
// get the caculated scene width and height and create an image of
particular size
myScene.paint (myOutputImageGraphics);

Be aware that this may introduce a problem later when you show the view
since the Graphics2D object may have different font-metrics ...

Regards,
  David


Peter Harman wrote:
> hi,
>  
> I am trying to export a scene as a java.awt.Image by painting to a
> BufferedImage, without opening the scene view in a topcomponent. In a
> similar manner to the issue raised in "Help regarding Satellite view
> integration with Navigator panel." I receive an error due to the scene
> not having been validated. Is there a way of doing this? I have tried
> creating a view but not using it, but this results in a blank image or
> the same issue.
>  
> thanks
>  
> Pete
>