Hi all,
I need to have my own custom labeling, which will place label near each
feature using information about clusters of features (known to my
application). In order to do it, I use my own function expression:
/*public class MyExpression extends FunctionExpressionImpl {
private Set lineIDs = new HashSet();
public MyExpression() {
super("MyExpression");
}
@Override
public int getArgCount() {
return 0;
}
@Override
public Object evaluate(Object objFeature) {
SimpleFeature feature = (SimpleFeature)objFeature;
Object attr1 = feature.getAttribute("Attr1");
*//* return *//*"*//*Attr1=*//*"+attr1*//*;
}
}*/
Then I create my text symbolizer:
/*MyExpression myExp = new MyExpression();
TextSymbolizer textSym = sf.createTextSymbolizer(
sf.createFill(ff.literal(Color.BLACK)), new
Font[]{sf.getDefaultFont()}, null, myExp , placement, null);*/
The problem that I run into is about feature passed to evaluate contains
only geometry, no attributes at all (except FeatureId). So,
/*feature.getAttribute("Attr1") */will always return null. However, in
order to display my clustering information I need certain attributes of
each feature.
Is this possible to do?
As a horrible workaround, I pass Map<FeautureId, SimpleFeature> to
/*MyExpression*/, and use these attributes. Downsides of this solution
are obvious.
Also I have another one question:
Is it possible to override behaviour of the default labeling in order to
show only one label per cluster of features? To what properties should
I pay my attention?
Are there some examples of creating custom labeling?
Any help would be appreciated....
Thanks in advance,
Sergey
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