>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 <dwins...@opengeo.org>:
> 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 <haavard.kongsga...@gmail.com>
>>
>> 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/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";>
>> <!-- 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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