<CssParameter
name="fill"><PropertyName>the_random_property</PropertyName></CssParameter>
There's some other nice techniques in the SLD cookbook section of the
manual, highly recommended reading for GeoServer stylists.
http://docs.geoserver.org/stable/en/user/styling/index.html
--
David Winslow
OpenGeo - http://opengeo.org/
2011/8/29 Håvard Wahl Kongsgård <[email protected]>
> >If you can modify your data, it might make sense to just add a column of
> random values to it and reference those from the SLD - that would allow you
> a bit more control if you find that the colors need tweaking (two similar
> colors in adjacent polygons, etc.)
>
> That would be a simple solution, in the SLD template how do I simply
> set the color equal to database field value?
>
> -Håvard
>
> 2011/8/29 David Winslow <[email protected]>:
> > If I wanted to achieve such a thing in Java, I would try something along
> the
> > lines of:
> >
> > int hash = feature.getFeatureId().hashCode();
> > String colorCode = String.format("#%06x", hash & 0xFFFFFF);
> >
> > I believe there is a format function exposed in GeoServer's SLD
> > implementation - but I am not sure about a good SLD substitute for
> > .hashCode. If you have to, it's not hard for a Java developer to add a
> > filter function.
> >
> > If you can modify your data, it might make sense to just add a column of
> > random values to it and reference those from the SLD - that would allow
> you
> > a bit more control if you find that the colors need tweaking (two similar
> > colors in adjacent polygons, etc.)
> >
> > --
> > David Winslow
> > OpenGeo - http://opengeo.org/
> >
> > 2011/8/28 Håvard Wahl Kongsgård <[email protected]>
> >>
> >> Hi, I have a layer with multiple bordering polygons which needs to be
> >> visually separated.
> >>
> >> One possibility is to create a massive SLD template, defining random
> >> colors for specific polygons.
> >>
> >> However, I noticed this post
> >>
> >>
> http://osgeo-org.1803224.n2.nabble.com/Random-function-in-SLD-td6125434.html
> >>
> >> The problem with that approach is that polygons change colors when
> >> zooming, and when map tiles are enabled, polygons crossing different
> >> tiles have multiple colors. With SLD templates is there another way to
> >> do this?
> >>
> >>
> >> <?xml version="1.0" encoding="ISO-8859-1"?>
> >> <StyledLayerDescriptor version="1.0.0"
> >> xsi:schemaLocation="http://www.opengis.net/sldStyledLayerDescriptor.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";>
> >> <!-- a Named Layer is the basic building block of an SLD document -->
> >> <NamedLayer>
> >> <Name>default_polygon</Name>
> >> <UserStyle>
> >> <!-- Styles can have names, titles and abstracts -->
> >> <Title>Default Polygon</Title>
> >> <Abstract>A sample style that draws a polygon</Abstract>
> >> <!-- FeatureTypeStyles describe how to render different features
> -->
> >> <!-- A FeatureTypeStyle for rendering polygons -->
> >> <FeatureTypeStyle>
> >> <Rule>
> >> <Name>rule1</Name>
> >> <PolygonSymbolizer>
> >> <Fill>
> >> <CssParameter name="fill">
> >> <ogc:Function name="numberFormat">
> >> <ogc:Literal>'#'000000</ogc:Literal>
> >> <ogc:Mul>
> >> <ogc:Function name="random"></ogc:Function>
> >> <ogc:Literal>1000000</ogc:Literal>
> >> </ogc:Mul>
> >> </ogc:Function>
> >> </CssParameter>
> >> <CssParameter name="fill-opacity">0.7</CssParameter>
> >> </Fill>
> >> <Stroke>
> >> <CssParameter name="stroke">#000000</CssParameter>
> >> <CssParameter name="stroke-width">1</CssParameter>
> >> </Stroke>
> >> </PolygonSymbolizer>
> >> </Rule>
> >> </FeatureTypeStyle>
> >> </UserStyle>
> >> </NamedLayer>
> >> </StyledLayerDescriptor>
> >>
> >> --
> >> Håvard Wahl Kongsgård
> >>
> >>
> >>
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> >
> >
>
>
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