[OpenLayers-Users] SLD PointSymbolizer - size defined with variable

[Bart van den Eijnden]

Sorry I did not read properly, please ignore my post :-)

Best regards,
Bart

On Jun 4, 2010, at 4:08 PM, Bart van den Eijnden wrote:

> Use ${myattributename}, see e.g. vector-features-with-text.html in the examples dir.
> 
> Best regards,
> Bart
> 
> On Jun 4, 2010, at 4:00 PM, Martin.L wrote:
> 
>> 
>> Keywords: GeoServer 2.0.2, OpenLayers, SLD
>> 
>> Hey there!
>> 
>> Is it possible to define the size of a PointSymbolizer with a variable? So
>> far the SLD-Code looks like this:
>> 
>> 
>> [...]
>> <Rule>
>>  <Title>Magnitude &lt; 3</Title>
>>      <ogc:Filter>
>> 	  <ogc:PropertyIsLessThan>
>> 		<ogc:PropertyName>magnitude</ogc:PropertyName>
>> 		<ogc:Literal>3</ogc:Literal>
>>         </ogc:PropertyIsLessThan>
>>      </ogc:Filter>
>>      <PointSymbolizer>
>> 	  <Graphic>
>>            <Mark>
>>               <WellKnownName>circle</WellKnownName>
>> 	           <Fill>
>> 			<CssParameter name="fill-opacity">0.4</CssParameter>
>> 			<CssParameter name="fill">#FF0000</CssParameter>
>> 		   </Fill>
>>            </Mark>
>>            <Size>4</Size>
>>         </Graphic>
>>      </PointSymbolizer>
>> </Rule>
>> [...]
>> 
>> 
>> Now I want to replace the constant size 4 with a variable which contains a
>> double value (magnitude). How can I realize it?
>> 
>> I found an idea with GeoServer 2.0.2. Perhaps you find a further solution
>> for it. With GeoServer 2.0.2 you can use Parameter substitution in SLD (
>> http://docs.geoserver.org/stable/en/user/styling/sld-extensions/substitution.html
>> Parameter Substitution ). So I made a new SLD looks like this:
>> 
>> 
>> [...]
>> <PointSymbolizer>
>>  <Graphic>
>>       <Mark>
>>           <WellKnownName>circle</WellKnownName>
>> 		<Fill>
>> 		     <CssParameter name="fill">
>> 			#<ogc:Function name="env">
>> 			     <ogc:Literal>color</ogc:Literal>
>> 			     <ogc:Literal>FF0000</ogc:Literal>
>> 		          </ogc:Function>
>> 		     </CssParameter>
>> 		</Fill>
>>       </Mark>
>>       <Size>
>> 	     <ogc:Function name="env">
>> 		  <ogc:Literal>size</ogc:Literal>
>> 		  <ogc:Literal>6</ogc:Literal>
>> 	     </ogc:Function>
>>       </Size>
>>   </Graphic>
>> </PointSymbolizer>
>> [...]
>> 
>> 
>> With this SLD you can manipulate the WMS-request with a env-Parameter in a
>> adressbar or in OpenLayers WMS-request looking like this:
>> 
>> 
>> earthquakes = new OpenLayers.Layer.WMS(
>>       "Earthquakes",
>>       "/geoserver/wms?",
>>       {
>> 		layers: "cite:EarthquakeView",
>> 		env: "size:16", //<<------
>> 		transparent: "true"
>>       }, 
>> 	{
>>       	buffer: 0,
>>       	visibility: true,
>>       	isBaseLayer: false,
>> 		displayInLayerSwitcher: true
>>       }
>> );
>> 
>> 
>> Is it possible to get a value from WMS-request from GeoServer or from my db
>> where the data is stored? If it is, I could add this value to the
>> env-parameter.
>> 
>> A great thank you in advance.
>> Martin
>> -- 
>> View this message in context: http://osgeo-org.1803224.n2.nabble.com/SLD-PointSymbolizer-size-defined-with-variable-tp5139542p5139542.html
>> Sent from the OpenLayers Users mailing list archive at Nabble.com.
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