Re: [Geotools-gt2-users] Programmatically retrieving a feature property name

[Justin D. <jde...@op...>]

Aha, very nice, much better than my suggestion :).

-Justin

Benoît Thiébault wrote:
> Hi Justin,
> 
> In fact, I just found a way to do it :
> 
> // Temporary style
> Style style = null;
> 
> // Style builder
> StyleBuilder sb = new StyleBuilder();
> 
> // Line symbolizer stroke
> Stroke stroke = sb.createStroke(sb.attributeExpression("color"), 
> sb.literalExpression(2.0));
>        
> // Line symbolizer
> LineSymbolizer lineSymbolizer = sb.createLineSymbolizer(stroke);
> 
> // Creates the style
> style = sb.createStyle(lineSymbolizer);
> 
> Le 5 mars 09 à 21:33, Justin Deoliveira a écrit :
> 
>> Hi Benoît,
>>
>> Looking at the style builder classes, it does not seem to be possible, 
>> as it does not expose a method that creates a stroke from an 
>> Expression.  However you can get at the underlying style factory 
>> (getStyleFactory()), and should be able to manually build up the 
>> symbolizer, creating the stroke with a property expression. The 
>> downside being that it will take 3 or 4 lines of code to build up the 
>> symbolizer manually, instead of calling a single method on the builder.
>>
>> -Justin
>>
>> Benoît Thiébault wrote:
>>> Hi everyone,
>>> I am trying to build a style programmatically, and I would like the  
>>> color of my line symbolizer to be retrieved from a feature 
>>> attribute,  like in the SLD sample below.
>>> Do you know how to do this ?
>>> <UserStyle>
>>>     <FeatureTypeStyle>
>>>          <Rule>
>>>             <LineSymbolizer>
>>>                 <Stroke>
>>>                     <CssParameter name=\"stroke\">
>>>                         <PropertyName>color</PropertyName>
>>>                     </CssParameter>
>>>                     <CssParameter name=\"width\">1.0</CssParameter>
>>>                 </Stroke>
>>>             </LineSymbolizer>
>>>         </Rule>
>>>     </FeatureTypeStyle>
>>> </UserStyle>
>>> Here is my code so far:
>>> // Create the style
>>> Style style = null;
>>> // Create the style builder and the filter factory
>>> StyleBuilder sb = new StyleBuilder();
>>> // Creates the line symbolizer
>>> LineSymbolizer symbolizer = sb.createLineSymbolizer(Color.decode(???));
>>> // Creates a rule
>>> Rule rule = sb.createRule(symbolizer);
>>> // Creates a feature style
>>> FeatureTypeStyle fts = sb.createFeatureTypeStyle(typeName, rule);
>>> // Creates the style
>>> style = sb.createStyle();
>>> // Adds the feature style to the style
>>> style.addFeatureTypeStyle(fts);
>>> ------------------------------------------------------------------------------ 
>>>
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>>
>>
>> -- 
>> Justin Deoliveira
>> OpenGeo - http://opengeo.org
>> Enterprise support for open source geospatial.
>>
> 
> Benoît Thiébault
> 
>   Société Artenum
>   24 rue Louis Blanc, 75010 Paris
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> 
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> 


-- 
Justin Deoliveira
OpenGeo - http://opengeo.org
Enterprise support for open source geospatial.