Hi Andrea,
I don't understand this method. Could you explain?
Thank You!
Yako Bak
> Date: Mon, 27 Apr 2009 10:21:43 +0200
> From: [email protected]
> To: [email protected]
> CC: [email protected]; [email protected]
> Subject: Re: [Geotools-gt2-users] Selecting a feature represented by a symbol
>
> Jody Garnett ha scritto:
> > You are correct this technique would only show the maximum size; and
> > use it to query. The style data structure is available so you can
> > perform the calculations yourself (to see if which rules have been
> > used).
> >
> > There are a couple different approaches to selection in an interactive
> > map; I mentioned one hack with respect to checking the pixels; a more
> > involved technique involves rendering as a zbuffer; you would need to
> > rewrite the renderer (or supply a hint) asking it to write down an
> > integer for each feature drawn; and then check the raster at the end
> > of the day to see what feature was "on top" in order to be clicked on.
> > Not very much fun which is why I have not done it yet.
>
> Actually, you can do that by rendering on top of a black and white
> buffered image, and attach a rendering listener that checks pixels
> after each rendered image, if the pixel in question is black, then
> the feature has been clicked on. Then turn the pixel back to white
> and allow the renderer to go to the next feature.
> Never actually implemented this, but should be doable.
>
> Cheers
> Andrea
>
>
> --
> Andrea Aime
> OpenGeo - http://opengeo.org
> Expert service straight from the developers.
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