Thank you Jody,
But each Feature on a Layer can be drawn in various ways depending on the
applied styling rules.
Is it possible to determine which rules has been applied by the renderer for a
given Feature?
Yako Bak
> Date: Sat, 25 Apr 2009 18:24:09 +1000
> Subject: Re: [Geotools-gt2-users] Selecting a feature represented by a symbol
> From: [email protected]
> To: [email protected]
> CC: [email protected]
>
> Have a look at the StyleVisitor interface; you can use that to visit
> all the symbolizer elements used to rendering your features (and
> figure out what the target size is; and then use that size rather than
> 3x3 to determine your selection bounds).
>
> Note: In uDig we render each layer individual; allowing me to
> experimented in the past with just checking the pixels to see if
> anything is hit before trying to do a feature based query; this is
> only useful if you are rendering content onto individual rasters and
> then merging them.
>
> Jody
>
> On Sat, Apr 25, 2009 at 1:56 AM, yako yako <[email protected]> wrote:
> > Hello,
> >
> > I am making an application where the user can retrieve information from a
> > feature by clicking on it.
> >
> > To do this, I make a filter to get all features located on the area defined
> > by the projection on the map
> > of a 3x3 pixels square centered on the position of the click.
> >
> > I encouter a problem with Feature represented by a symbol because this
> > symbol can be bigger than
> > the real geometry of the feature. So we can not click anywhere on it to
> > retrieve its information.
> >
> > Is it possible to get the bounds of the symbol used to represent a feature
> > in order to compute its projection
> > on the map and check if it intersects the 'click area'?
> >
> > Is there an other way to assign a feature to a pixel on the map whatever its
> > type of representation is ?
> >
> > I hope I've been clear enough.
> >
> > Thank you,
> >
> > Yako Bak.
> >
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