Re: [Geotools-gt2-users] Centering and formatting the text of a TextSymbolizer

[Benoît Thiébault]

Thanks Andrea !




Here is the working code, for those who are interested.

I found what I did wrong. I used two Strings instead of a String and a Double. Your example helped me to find this rather trivial mistake.

NumberFormatFunction.java
Description: Binary data

Le 3 mars 09 à 18:10, Andrea Aime a écrit :

Benoît Thiébault wrote:

OK for the text symbolizer, I have replaced the code as you said.

I have built the formatter from the string result.

Regarding the evaluate method, I have evaluated the two parameters against the object as you said (see below). But then, I don't know what to return. I have tried (T) formatter.format(propertyString), but it doesn't seem to work.

Here is a working example (you need to register the function
in SPI for it to work):

package org.aaa;

import java.text.DecimalFormat;
import java.text.NumberFormat;

import org.geotools.data.DataUtilities;
import org.geotools.factory.CommonFactoryFinder;
import org.geotools.filter.FunctionExpressionImpl;
import org.opengis.feature.simple.SimpleFeature;
import org.opengis.feature.simple.SimpleFeatureType;
import org.opengis.filter.FilterFactory;
import org.opengis.filter.expression.Function;


public class FormatterFunction extends FunctionExpressionImpl {

   public FormatterFunction() {
       super("formatter");
   }

   @Override
   public int getArgCount() {
       return 2;
   }

   @Override
   public Object evaluate(Object object) {



       NumberFormat format = new DecimalFormat(pattern);
       return format.format(number);
   }

   public static void main(String[] args) throws Exception {


       FilterFactory ff = CommonFactoryFinder.getFilterFactory(null);

       System.out.println(formatter.evaluate(f));
   }
}


Cheers
Andrea

Double number = getExpression(0).evaluate(object, Double.class); String pattern = getExpression(1).evaluate(object, String.class); SimpleFeatureType ft = DataUtilities.createType("testType", "value:double,msg:String"); SimpleFeature f = DataUtilities.parse(ft, "testType.1", new String[] {"1.56789", "hello"}); Function formatter = ff.function("formatter", ff.property("value"), ff.literal("#.##"));

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