[Qgis-developer] Displacement and SLD's

[Giuseppe Sucameli]

Hi Jonathan

On Tue, May 7, 2013 at 7:42 PM, Jonathan Moules <
jonathanmoules at warwickshire.gov.uk> wrote:

> So my question is - how should that style be created with SLD's? Does QGIS
> does it "properly"?


no way in this moment, you could use Displacement tag with SVG images
created ad-hoc, i.e. with some empty space around the original image.

Andrea (who's implementing it), has noted that displacement alone can't do
> this, so has proposed a solution which would work, but would require an SLD
> file different from the one that QGIS 1.8 exported. His proposed solution
> is:
> https://jira.codehaus.org/browse/GEOS-5794?focusedCommentId=324800#comment-324800
>


IMHO the displacement shouldn't be used in that way, as empty space between
graphics, though the SE1.1 specs doesn't define a proper tag to do that...
In fact the Graphic->Displacement tag is already used in other contexts
with the meaning of "distance in pixels from the hot-spot", not as space
around the graphic symbol neither as offset between neighbour graphics.


> What is the QGIS solution to this? Does it implement it at all from an SLD
> file?
>

I would define 2 new tags as GraphicFill tag's children, like it's already
done in the GraphicStroke tag.
GraphicStroke has Gap and InitialGap, we should use the same approach.


> I ask because I think one common implementation concept would be better
> than multiple divergent incompatible ones as QGIS is used by some people to
> style SLD's for GeoServer.
>

I agree, could you report my thoughts to the GeoServer ticket?
Regards.


> Thanks,
> Jonathan
>
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-- 
Giuseppe Sucameli
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