Showing svg document in two canvasses

[Axel Hallez <Ax...@UGent.be>]

Hello all,

I want to show an svg document in two canvasses, one canvas is 
integrated in a JFrame, the other one is shown full screen. If the user 
has a multiscreen setup, both could be visible at same time. The 
document is dynamically changed by an eventlistener.

Now I'm wondering about what's the most efficient way to do this. I 
could have two instances of JSVGCanvas each with its own document and 
apply all updates twice. However this seems to to be wastefull on 
resources. Is it possible for two JSVGCanvasses to share the document?

Thanks in advance,
Axel Hallez

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Re: Showing svg document in two canvasses

[th...@kodak.com]

Hi Axel,

Axel Hallez <Ax...@UGent.be> wrote on 05/23/2006 04:30:59 AM:

> I want to show an svg document in two canvasses, one canvas is 
> integrated in a JFrame, the other one is shown full screen. If the user 
> has a multiscreen setup, both could be visible at same time. The 
> document is dynamically changed by an eventlistener.
> 
> Now I'm wondering about what's the most efficient way to do this. I 
> could have two instances of JSVGCanvas each with its own document and 
> apply all updates twice. However this seems to to be wastefull on 
> resources. Is it possible for two JSVGCanvasses to share the document?

   It is not possible for two JSVGCanvases to share a document (the
main "real" problem is that it becomes impossible to make sense of 
things in the SVG DOM like 'getScreenCTM').

   However, you can have the SVG document associated with one Canvas
and share the GVT tree with a JGVTComponent.  You still have some
problems as the JGVTComponent doesn't automatically track updates,
however with some work you should be able to propagate the region
updates from the JSVGCanvas the JGVTComponent.

   This is the basic approach taken by the thumbnail viewer in
Squiggle (note that it does not update the thumbnail view...).


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