Matt Foster wrote:
> All,
>
> I'm trying to create a RasterSymbolizer from scratch (i.e. I don't
> have a SLD to read). I think I've figured it out down to the point
> where I construct the ColorMapEntry objects. ColorMapEntry requires
> GeoAPI Expressions for the color and quantity, and I can't figure out
> the right way to create the Expressions.
>
> Can anyone provide some tips or sample code?
User guide has a several examples of making expressions:
-
http://docs.codehaus.org/display/GEOTDOC/Filter+Interfaces#FilterInterfaces-Expressions
- http://docs.codehaus.org/display/GEOTDOC/01+CQL+Examples
FilterFactory ff = CommonFactoryFinder.getFilterFactory(
GeoTools.getDefaultHints );
Expression expr1 = ff.property( "attName");
Expression expr2 = ff.literal( 24 );
Expression expr3 = ff.literal( "hello world" );
Or using CQL:
Expression expr1 = CQL.toExpression("attName");
Expression expr2 = CQL.toExpression("34");
Expression expr4 = CQL.toExpression("'hello world'");
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