[OpenLayers-Dev] SLD parsing and rendering

[Cameron Shorter]

Yes, thanks for all the hard work on this thread.

Tim Schaub wrote:
> Hey-
>
> 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.
>
> Tim
>
> 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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>
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-- 
Cameron Shorter
Systems Architect, http://lisasoft.com.au
Tel: +61 (0)2 8570 5050
Mob: +61 (0)419 142 254