On Sun, Jun 24, 2012 at 7:07 PM, <[email protected]> wrote:
> **
> Unfortunately, that's not the behavior I'm seeing. I create my fill
> function like so:
>
> Fill fill = styleFactory.createFill(
> newColor, // function to choose
> feature colour
> filterFactory.literal(1.0f)); // opacity
> where newColor is my external function. When I use
> JMapFrame.showMap(map); to show the map, it makes exactly one call to
> newColor.evaluate(Object), where the parameter is a SimpleFeatureImpl
> object containing only the geometry. My evaluate function looks like this:
>
> @Override
> public Object evaluate(Object object) {
> return Color.GREEN;
> }
> Unless the calling routine is "sensing" that I am returning a constant,
> there is no reason that this should only be called once for a map with
> 18,000 features.
>
It is actually sensing that, since you have no parameters in your function
the assumption is that the result will be
the same for all features, and thus the evaluation is performed just once
and your function turned into a literal.
If you function has not parameter depending on feature attributes but it
still returns varying output you should
make it implement the "VolatileFunction" interface (which, as of today,
only the random function implements)
Cheers
Andrea
--
Ing. Andrea Aime
GeoSolutions S.A.S.
Tech lead
Via Poggio alle Viti 1187
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Italy
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