[Chameleon] ExpressionBuilder: 2 GetMap requests

[Paul Spencer]

Bart, AFAIK MapServer doesn't support NamedStyle yet so this won't work. 
  I could be wrong.

Cheers

Paul

Bart van den Eijnden wrote:
> Hi list,
> 
> I was just thinking about one thing. Currently the Chameleon  
> ExpressionBuilder needs 2 GetMap requests in order to draw a selection.  
> The first, bottom-most layer is just a normal WMS layer in the normal  
> style defined on the server, the top-most layer is the selection 
> displayed  eg in red using SLD UserStyle.
> 
> I was re-studying the SLD spec and this should be possible with only 1  
> GetMap request, I only don't know if Mapserver support this .... but 
> Paul  or Assefa might know?
> 
> You can combine a UserStyle with a NamedStyle in an SLD, where you use 
> the  NamedStyle default (which is advertized by Mapserver WMS in the  
> capabilities). An example from the SLD spec (the namedstyle is drawn at  
> the bottom):
> 
> <StyledLayerDescriptorversion="1.0.0"><NamedLayer><Name>Roads</Name><UserStyle><FeatureStyleType><Rule><LineSymbolizer><Geometry><ogc:PropertyName>center-line</ogc:PropertyName></Geometry><Stroke><CssParametername="stroke">#aaaaff</CssParameter><CssParametername="stroke-width">5.0</CssParameter></Stroke></LineSymbolizer></Rule></FeatureTypeStyle></UserStyle><NamedStyle><Name>default</Name></NamedStyle></NamedLayer></StyledLayerDescriptor> 
> 
> 
> Any thoughts?
> 
> Best regards,
> Bart
> 

-- 
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|Paul Spencer                           pspencer at dmsolutions.ca   |
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|Applications & Software Development                              |
|DM Solutions Group Inc                 http://www.dmsolutions.ca/|
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