[OpenLayers-Users] Styling with SLDs and Clustering

[Michael Prieß]

Hi all,

i have to show a lot of icons inside my map and used clustering to realize
this.So i started to load all my icons from the WFS with the other
attributes that styling related.
For filtering i use a style map at the moment. So i do all the styling logic
with rules. What i doesn't like on this way is, that the styling rules
inside my code and that i have to use a fixed graphicHeight and
graphicWidth.

Can i use something like the SLD bellow to do all the styling stuff that i
like to do ? Have anyone an example which us ExternalGraphic ?

          <Rule>
            <ogc:Filter>
              <ogc:PropertyIsEqualTo>
                <ogc:PropertyName>category</ogc:PropertyName>
                  <ogc:Literal>61</ogc:Literal>
              </ogc:PropertyIsEqualTo>
            </ogc:Filter>
            <PointSymbolizer>
              <Graphic>
                <ExternalGraphic>
                  <OnlineResource xlink:type="simple"
xlink:href="./resources/img/traffic/iconSmall62.png"/>
                  <Format>image/png</Format>
                </ExternalGraphic>
                <Mark/>
              </Graphic>
            </PointSymbolizer>
          </Rule>

Stylemap Example:

    var infoStyle = new OpenLayers.Style(
        // the first argument is a base symbolizer
        // all other symbolizers in rules will extend this one
        {
        },
        {
            rules: [
                new OpenLayers.Rule({
                    filter: new OpenLayers.Filter.Comparison({
                        type: OpenLayers.Filter.Comparison.GREATER_THAN,
                        property: "count", // the "foo" feature attribute
                        value: 1
                    }),
                    symbolizer: {
                        externalGraphic: "./resources/img/cluster.png",
                        label: "${count}",
                        graphicWidth: 25,
                        graphicHeight: 25
                    }
                }),
                new OpenLayers.Rule({
                    filter: new OpenLayers.Filter.Comparison({
                        type: OpenLayers.Filter.Comparison.EQUAL_TO,
                        property: "category", // the "foo" feature attribute
                        value: 62
                    }),
                    symbolizer: {
                        externalGraphic:
"./resources/img/traffic/iconSmall62.png",
                        graphicWidth: 25,
                        graphicHeight: 25
                    }
                }),
etc...
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