Dear GeoServer users,
I have a layer which shows data from a meteorology station network in
using very specific graphics symbol.
The symbol consists of a colored square to the left and a colored
rectangle to the right of feature's anchor point, with a possibility of
label drawn over the rectangle.
I'm using my custom PNG icons as <ExternalGraphic> and choose the right
colors according to feature data as follows:
<Rule>
<Name>stations</Name>
<PointSymbolizer>
<Graphic>
<ExternalGraphic>
<OnlineResource xlink:type="simple"
xlink:href="file://station_${TENDENCY}_${SPA}_${PREC}_${TEMP_DRY}_${TEMP_WATER}.png"/>
<Format>image/png</Format>
</ExternalGraphic>
</Graphic>
</PointSymbolizer>
<TextSymbolizer>
<Label>
<ogc:PropertyName>TEXT</ogc:PropertyName>
</Label>
<Font>
<CssParameter name="font-family">Arial</CssParameter>
<CssParameter name="font-size">14</CssParameter>
<CssParameter name="font-style">normal</CssParameter>
<CssParameter name="font-weight">bold</CssParameter>
</Font>
<LabelPlacement>
<PointPlacement>
<AnchorPoint>
<AnchorPointX>0</AnchorPointX>
<AnchorPointY>0</AnchorPointY>
</AnchorPoint>
<Displacement>
<DisplacementX>-2</DisplacementX>
<DisplacementY>4</DisplacementY>
</Displacement>
</PointPlacement>
</LabelPlacement>
<Fill>#FFFFFF</Fill>
</TextSymbolizer>
</Rule>
The problem is that the icons might overlap and when they do the text is
drawn always on top, regardless of relative z-index of the icon it
belongs to. Here's an example: http://imgur.com/YxwieHW
It seems to me all graphics are rendered first and all labels are
rendered after.
What can I do about it?
I tried using shapes from SLD styles but I need to use more than one
shape for every feature. GeoServer renders multiple shapes centered
around anchor point and there is no possibility to use Displacement for
graphic (AFAIK it's possible only with text labels). That's why I use
ExternalGraphic, I need to show all shapes side by side.
Many thanks
--
Peter Kovac
IMS Programmer
MicroStep-MIS
[email protected]
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