I am attempting to use the offset function to shift the icons resulting
from the output of PointStacker. When I add this call, the object is
never rendered. There is no error in the log, or any indication of a
problem. I partially resolved this when I discovered the undocumented
'preserveLocation' parameter to PointStacker, but I would still like to
have this option. Any suggestions how what I am doing wrong, or is this
a bug? If I use offset in one of the non-PointStacker features it works
as expected. The SLD I am using is included below.
<?xml version="1.0" encoding="ISO-8859-1"?>
<StyledLayerDescriptor version="1.0.0"
xsi:schemaLocation="http://www.opengis.net/sld
StyledLayerDescriptor.xsd"
xmlns="http://www.opengis.net/sld";
xmlns:ogc="http://www.opengis.net/ogc";
xmlns:xlink="http://www.w3.org/1999/xlink";
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance";>
<NamedLayer>
<Name>CameraCluster</Name>
<UserStyle>
<Title>Camera Cluster</Title>
<Abstract>Cameras with clustering</Abstract>
<FeatureTypeStyle>
<Transformation>
<ogc:Function name="vec:PointStacker">
<ogc:Function name="parameter">
<ogc:Literal>data</ogc:Literal>
</ogc:Function>
<ogc:Function name="parameter">
<ogc:Literal>preserveLocation</ogc:Literal>
<ogc:Literal>Single</ogc:Literal>
</ogc:Function>
<ogc:Function name="parameter">
<ogc:Literal>cellSize</ogc:Literal>
<ogc:Literal>32</ogc:Literal>
</ogc:Function>
<ogc:Function name="parameter">
<ogc:Literal>outputBBOX</ogc:Literal>
<ogc:Function name="env">
<ogc:Literal>wms_bbox</ogc:Literal>
</ogc:Function>
</ogc:Function>
<ogc:Function name="parameter">
<ogc:Literal>outputWidth</ogc:Literal>
<ogc:Function name="env">
<ogc:Literal>wms_width</ogc:Literal>
</ogc:Function>
</ogc:Function>
<ogc:Function name="parameter">
<ogc:Literal>outputHeight</ogc:Literal>
<ogc:Function name="env">
<ogc:Literal>wms_height</ogc:Literal>
</ogc:Function>
</ogc:Function>
</ogc:Function>
</Transformation>
<Rule>
<Name>single</Name>
<Title>Camera</Title>
<ogc:Filter>
<ogc:PropertyIsLessThanOrEqualTo>
<ogc:PropertyName>count</ogc:PropertyName>
<ogc:Literal>1</ogc:Literal>
</ogc:PropertyIsLessThanOrEqualTo>
</ogc:Filter>
<MinScaleDenominator>32000.0</MinScaleDenominator>
<PointSymbolizer>
<Graphic>
<ExternalGraphic>
<OnlineResource xlink:type="simple"
xlink:href="http://our511.com/camera.svg"; />
<Format>image/svg+xml</Format>
</ExternalGraphic>
<Size>16</Size>
</Graphic>
</PointSymbolizer>
</Rule>
<Rule>
<Name>multiple</Name>
<Title>Cameras</Title>
<ogc:Filter>
<ogc:PropertyIsGreaterThan>
<ogc:PropertyName>count</ogc:PropertyName>
<ogc:Literal>1</ogc:Literal>
</ogc:PropertyIsGreaterThan>
</ogc:Filter>
<MinScaleDenominator>32000.0</MinScaleDenominator>
<PointSymbolizer>
<Geometry>
<ogc:Function name="offset">
<ogc:PropertyName>the_geom</ogc:PropertyName>
<ogc:Literal>-0.000005</ogc:Literal>
<ogc:Literal>0</ogc:Literal>
</ogc:Function>
</Geometry>
<Graphic>
<ExternalGraphic>
<OnlineResource xlink:type="simple"
xlink:href="http://our511.com/camera.svg"; />
<Format>image/svg+xml</Format>
</ExternalGraphic>
<Size>24</Size>
</Graphic>
</PointSymbolizer>
<TextSymbolizer>
<Label>
<ogc:PropertyName>count</ogc:PropertyName>
</Label>
<Font>
<CssParameter name="font-family">Arial</CssParameter>
<CssParameter name="font-size">12</CssParameter>
<CssParameter name="font-weight">bold</CssParameter>
</Font>
<LabelPlacement>
<PointPlacement>
<Displacement>
<DisplacementX>-3</DisplacementX>
<DisplacementY>-6</DisplacementY>
</Displacement>
</PointPlacement>
</LabelPlacement>
<Halo>
<Radius>2</Radius>
<Fill>
<CssParameter name="fill">#AA0000</CssParameter>
<CssParameter name="fill-opacity">0.9</CssParameter>
</Fill>
</Halo>
<Fill>
<CssParameter name="fill">#FFFFFF</CssParameter>
<CssParameter name="fill-opacity">1.0</CssParameter>
</Fill>
</TextSymbolizer>
</Rule>
</FeatureTypeStyle>
<FeatureTypeStyle>
<Rule>
<Name>single</Name>
<Title>Camera</Title>
<MaxScaleDenominator>32000.0</MaxScaleDenominator>
<PointSymbolizer>
<Graphic>
<ExternalGraphic>
<OnlineResource xlink:type="simple"
xlink:href="http://our511.com/camera.svg"; />
<Format>image/svg+xml</Format>
</ExternalGraphic>
<Size>24</Size>
</Graphic>
</PointSymbolizer>
</Rule>
</FeatureTypeStyle>
<FeatureTypeStyle>
<Rule>
<Name>single</Name>
<Title>Camera</Title>
<PointSymbolizer>
<Graphic>
<Mark>
<WellKnownName>circle</WellKnownName>
<Fill>
<CssParameter name="fill">#FF0000</CssParameter>
</Fill>
</Mark>
<Size>3</Size>
</Graphic>
</PointSymbolizer>
</Rule>
</FeatureTypeStyle>
</UserStyle>
</NamedLayer>
</StyledLayerDescriptor>
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