I think you will find three already defined; and at least one of them
implemented in the render module.
Reni and I were looking at them last year.
stroke-width:
- categorize( attribute, 1, 5000, 2, 15000, 3, 40000, 4,750000, 5 );
fill-color:
- interpolation( attribute, 0.0, '#005500', 3300.0, 'AA1100', 5000.0, #FFFFFF,
"linear", "color", )
Where:
- linear/cosine/cubic ar e valid interpolations
- and they indicate the interpolation method as numeric or color
From:
OpenGIS® Symbology Encoding Implementation Specification | OGC®
Jody
On 18/03/2010, at 10:36 PM, Michael Bedward wrote:
> Hi folks,
>
> I'd like to add a filter function to generate colours from a colour
> ramp based on feature attribute values.
>
> To give you the idea, there's a version of such a function in the
> examples, plus an app that uses it to display the countries shapefile
> with fill colour based on population values...
> http://svn.osgeo.org/geotools/trunk/demo/example/src/main/java/org/geotools/demo/filter/function/
>
> The app shows the function used programmatically and also from the SLD
> file here...
> http://svn.osgeo.org/geotools/trunk/demo/example/src/main/resources/data/shapefiles/
>
> I'd appreciate your thoughts on what the parameters for such a
> function should be to make it flexible enough to be useful without
> being cumbersome to apply, especially in a SLD doc. Also, I suppose,
> your opinions on whether it's worth adding at all.
>
> cheers
> Michael
>
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