[OpenLayers-Dev] SLD parsing and rendering

Tim Schaub tschaub at openplans.org
Wed Oct 17 17:51:56 EDT 2007


This is great work - and a huge contribution to OpenLayers!  I look 
forward to taking some time with it.  Just a quick thanks for putting it 
all together.


Andreas Hocevar wrote:
> Hi,
> the SLD parsing and rendering component (#533, [1]) I was working on
> with Pierre Giraud of Camptocamp at the FOSS4G code sprint is now
> ready for review. Since the code sprint, there have been major
> improvements:
> * OGC filter rules are no longer translated to JavaScript eval
> snippets. There is a new object hierarchy under OpenLayers.Rule with
> classes to store and evaluate rules. The big advantage of that is not
> only performance, but also that it is much easier to use as a starting
> point for a SLD editor that has to store rules and write them back to
> a SLD file.
> * More of the OGC filter spec is supported, namely the PropertyIsLike filter.
> * Parsing of sld:NamedLayer/sld:Name and sld:UserStyle/sld:IsDefault.
> Based on that, vector layers can now take the whole result hash of
> OpenLayers.Format.SLD.read() as style property and automatically use
> the default style for the NamedLayer that has the same name as the
> vector layer and is marked as IsDefault.
> * Improved example with the Tasmania data set from Geoserver [2]. The
> first version of this was contributed by Alex of Lisasoft, along with
> thorough testing.
> * TestAnotherWay tests for basic functionality of all new classes.
> * Improved code readability and comments.
> * Changes on the OpenLayers trunk codebase are limited to a few lines
> in two files: Layer/Vector.js and Control/SelectFeature.js
> Please have a look at it, I hope you share my opinion that this thing
> is ready for moving it to trunk. If not, feel free to comment on it
> and tell me what to improve.
> Once this is finished, it will be used for styling vector layers in
> Mapbuilder based on the SLD properties in View/OWS Context documents.
> It should also be a solid ground to build a SLD editor upon.
> Regards,
> Andreas.
> [1] http://trac.openlayers.org/ticket/533
> [2] http://dev.openlayers.org/sandbox/ahocevar/sldRenderer/examples/gml-tasmania-sld.html
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