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 < 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
--
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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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