--- a/gnv-artifacts/ChangeLog	Mon Mar 22 09:15:05 2010 +0000
+++ b/gnv-artifacts/ChangeLog	Mon Mar 22 10:57:35 2010 +0000
@@ -1,3 +1,15 @@
+2010-03-22  Ingo Weinzierl <ingo.weinzierl@intevation.de>
+
+	  Issue209
+
+	* src/main/java/de/intevation/gnv/utils/ShapeFileWriter.java: Added a
+	  further column in the isolines shapefile to store a description for each
+	  line. This description column contains the double value with three maximum
+	  fraction digits. This is a workaround to adjust the rendering of double 
+	  values which cannot be adjusted in MapServer at the moment. MapServer
+	  would display all fraction digits contained in the shapefile causing very
+	  long labels.
+
 2010-03-22  Ingo Weinzierl <ingo.weinzierl@intevation.de>
 
 	  Issue208 (Added a cleanup mechanism to do some things before exporting an

--- a/gnv-artifacts/src/main/java/de/intevation/gnv/utils/ShapeFileWriter.java	Mon Mar 22 09:15:05 2010 +0000
+++ b/gnv-artifacts/src/main/java/de/intevation/gnv/utils/ShapeFileWriter.java	Mon Mar 22 10:57:35 2010 +0000
@@ -4,6 +4,7 @@
 import java.io.IOException;
 import java.io.Serializable;
 import java.net.MalformedURLException;
+import java.text.NumberFormat;
 import java.util.Collection;
 import java.util.Date;
 import java.util.HashMap;
@@ -43,6 +44,10 @@
     private static Logger log = Logger.getLogger(
         ShapeFileWriter.class);
 
+    private static NumberFormat format = NumberFormat.getInstance();
+
+    public static final int DOUBLE_PRECISION = 3;
+
     private ShapeFileWriter() {
     }
 
@@ -96,7 +101,8 @@
                 "PARAMETER:Integer," + 
                 "LAYER:Integer,"     +
                 "DATE:Date,"         +
-                "VALUE:Double");
+                "VALUE:Double,"       +
+                "DESC:String");
         }
         catch (SchemaException se) {
             log.error(se.getLocalizedMessage(), se);
@@ -115,6 +121,7 @@
             featureBuilder.add(layer);
             featureBuilder.add(date);
             featureBuilder.add(pair.getA());
+            featureBuilder.add(value2description(asDouble(pair.getA())));
             SimpleFeature feature = featureBuilder.buildFeature(null);
             collection.add(feature);
         }
@@ -398,5 +405,11 @@
         }
         return 0d;
     }
+
+    private static final String value2description(Double value) {
+        format.setMaximumFractionDigits(DOUBLE_PRECISION);
+
+        return format.format(value);
+    }
 }
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