Details
Description
Hello,
I was trying to create a style visualising traffic flows as stroke width on a bidirectional road network like the attached image.
I was trying to submit the following to CSS Styling extension (GeoServer 2.9.1)
* {
stroke: #27b700;
stroke-linecap: butt;
stroke-linejoin: bevel;
stroke-width : [ max(0.5, min(58.27, traffic_flow * 58.27 / 20000)) ];
stroke-offset: [ -0.5 * max(0.5, min(58.27, traffic_flow * 58.27 / 20000)) - 1 ];
}
The CSS was accepted without validation errors but the generated SLD turned out to be the following
<?xml version="1.0" encoding="UTF-8"?> <sld:StyledLayerDescriptor xmlns="http://www.opengis.net/sld" xmlns:sld="http://www.opengis.net/sld" xmlns:gml="http://www.opengis.net/gml" xmlns:ogc="http://www.opengis.net/ogc" version="1.0.0"> <sld:NamedLayer> <sld:Name>Default Styler</sld:Name> <sld:UserStyle> <sld:Name>Default Styler</sld:Name> <sld:FeatureTypeStyle> <sld:Rule> <sld:LineSymbolizer> <sld:Stroke> <sld:CssParameter name="stroke">#27b700</sld:CssParameter> <sld:CssParameter name="stroke-linejoin">bevel</sld:CssParameter> <sld:CssParameter name="stroke-width"> <ogc:Function name="max"> <ogc:Literal>0.5</ogc:Literal> <ogc:Function name="min"> <ogc:Literal>58.27</ogc:Literal> <ogc:Div> <ogc:Mul> <ogc:PropertyName>traffic_flow</ogc:PropertyName> <ogc:Literal>58.27</ogc:Literal> </ogc:Mul> <ogc:Literal>20000</ogc:Literal> </ogc:Div> </ogc:Function> </ogc:Function> </sld:CssParameter> </sld:Stroke> <sld:PerpendicularOffset>((-0.5*max([0.5], [min([58.27], [((traffic_flow*58.27)/20000)])]))-1)</sld:PerpendicularOffset> </sld:LineSymbolizer> </sld:Rule> <sld:VendorOption name="ruleEvaluation">first</sld:VendorOption> </sld:FeatureTypeStyle> </sld:UserStyle> </sld:NamedLayer> </sld:StyledLayerDescriptor>
You will see that the interpretor just put the stroke-offset to PerpendicularOffset without any translation, not even wrapped in ogc:Literal tag. Consequently, GeoSever throws an error when this SLD is applied.
The correct SLD should be like this. This has worked without errors as GeoServer allows expressions for PerpendicularOffsett.
<?xml version="1.0" encoding="UTF-8"?> <sld:StyledLayerDescriptor xmlns="http://www.opengis.net/sld" xmlns:sld="http://www.opengis.net/sld" xmlns:gml="http://www.opengis.net/gml" xmlns:ogc="http://www.opengis.net/ogc" version="1.0.0"> <sld:NamedLayer> <sld:Name>Default Styler</sld:Name> <sld:UserStyle> <sld:Name>Default Styler</sld:Name> <sld:FeatureTypeStyle> <sld:Rule> <sld:LineSymbolizer> <sld:Stroke> <sld:CssParameter name="stroke">#27b700</sld:CssParameter> <sld:CssParameter name="stroke-linejoin">bevel</sld:CssParameter> <sld:CssParameter name="stroke-width"> <ogc:Function name="max"> <ogc:Literal>0.5</ogc:Literal> <ogc:Function name="min"> <ogc:Literal>58.27</ogc:Literal> <ogc:Div> <ogc:Mul> <ogc:PropertyName>traffic_flow</ogc:PropertyName> <ogc:Literal>58.27</ogc:Literal> </ogc:Mul> <ogc:Literal>20000</ogc:Literal> </ogc:Div> </ogc:Function> </ogc:Function> </sld:CssParameter> </sld:Stroke> <sld:PerpendicularOffset> <ogc:Add> <ogc:Mul> <ogc:Literal>-0.5</ogc:Literal> <ogc:Function name="max"> <ogc:Literal>0.5</ogc:Literal> <ogc:Function name="min"> <ogc:Literal>58.27</ogc:Literal> <ogc:Div> <ogc:Mul> <ogc:PropertyName>traffic_flow</ogc:PropertyName> <ogc:Literal>58.27</ogc:Literal> </ogc:Mul> <ogc:Literal>20000</ogc:Literal> </ogc:Div> </ogc:Function> </ogc:Function> </ogc:Mul> <ogc:Literal>-1</ogc:Literal> </ogc:Add> </sld:PerpendicularOffset> </sld:LineSymbolizer> </sld:Rule> <sld:VendorOption name="ruleEvaluation">first</sld:VendorOption> </sld:FeatureTypeStyle> </sld:UserStyle> </sld:NamedLayer> </sld:StyledLayerDescriptor>
I think it is worth to enable users to use expressions in stroke-offset.
Please note that I have also tried this in the refined new style editor (the default one, not the extension one) but things were the same.
Many thanks,
Attachments
Issue links
- is blocked by
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GEOT-5557 SLDTransformer does not correctly encode expressions in line symbolizer perpendicular offset
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- Closed
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