Re: [Jung-support] Generating an image with the graph

[Joshua O'M. <jos...@gm...>]

Barak:

Try doing a search for 'headless' in the JUNG web forum archives.

Also, please send all responses to the jung-support list.  I'm not the
only person answering questions, and in this case I'm far from the
most informed.  :)

Joshua

On 8/29/07, Barak Ori <bar...@tr...> wrote:
> Joshua,
>
> Thanks for the info, but rendered where to? I would like to generate graphs
> in a headless environment. I was hoping the paint would render to my
> BufferedImage. Whatever's happening before the rendering, is there a way to
> manually make it happen?
>
> Thanks.
>
>
> Joshua O'Madadhain wrote:
> Barak:

If I recall correctly, the graph has to be rendered before you can
> use
this method to store an image.

Joshua

On 8/29/07, Barak Ori
> <bar...@tr...> wrote:

> I took one of the samples available with JUNG, and I'm trying to store
the
> result graph in an image file (e.g. JPEG). I followed the 2nd
> sample
presented in the FAQ
> (http://jung.sourceforge.net/developer_faq.txt)
under the
> CAPTURING GRAPHS section. It starts like this:

 public void
> writeJPEGImage(VisualizationViewer vv, String filename) {
> int width = vv.getLayout().getCurrentSize().width;
 int height =
> vv.getLayout().getCurrentSize().height;


The problem is that when I
> actually call the
vv.getLayout().getCurrentSize().width, it doesn't compile
> - there's no
getCurrentSize on the layout. I tried using getWidth() and
> getHeight()
on the vv variable directly, but both of these functions return
> 0. I
tried fixing the width & height to the values I know (I created
> the
VisualizationViewer a few lines above so I know the size), but the
> image
came out empty (all background).

It seems that
> vv.paintComponents(graphics) should do the job, but
nothing happens. Am I
> doing the paint too early? Do I need to wait for
some initializations or
> perform them myself before the paint can
> work?

Thanks.

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-- 
  jos...@gm......................www.ics.uci.edu/~jmadden
   Joshua O'Madadhain: Information Scientist, Musician, Philosopher-At-Tall
It's that moment of dawning comprehension that I live for.  -- Bill Watterson
 My opinions are too rational and insightful to be those of any organization.