On Thu, May 7, 2015 at 8:56 AM, Paolo Pasquali <paolo.pasquali@anonymised.com>
wrote:
Dear all,
I've tried using an attribute value in the z_index, like this:
z-index: [z_order];
but I get this error:
z-index must be integer literals, they cannot be expressions, multi-values
or any other type: Expression [expression=z_order]
(z_order is a smallint in the db)
Since I want to style a roads layer, it would be great to control overpass
levels without creating way too complex styles. Is there a way to do it?
Nope, it's not possible, it's like asking if you can put a feature in a
different SLD FeatureTypeStyle
based on an attribute (since that's how z-orders are translated to SLD
before
rendering).
Overall z control, cross layer, is probably not possible, it would require
us to keep all the
features, from all layers, in memory and sort them based on their z value
before rendering
them, which would likely make GeoServer much more likely to go out of
memory.
I mean, it's not unfeasible, but it would be destabilizing for a OGC server
whose load
is at the mercy of users using it (less so if the thing is only used for
backend tile seeding,
since the admin can control the load level).
It would be somewhat easier to allow feature paint order control over a
single layer instead,
as we could just issue a sort-by on that field before rendering... still,
it's a feature that
needs some sponsoring, or a good soul willing to work on it in spare time.
Cheers
Andrea
--
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Ing. Andrea Aime
@geowolf
Technical Lead
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