--- a/flys-artifacts/ChangeLog	Wed Sep 21 13:49:50 2011 +0000
+++ b/flys-artifacts/ChangeLog	Wed Sep 21 13:53:09 2011 +0000
@@ -1,3 +1,10 @@
+2011-09-21  Felix Wolfsteller <felix.wolfsteller@intevation.de>
+
+ Added WaterlevelOut-processing ability to WDifferencesCurveGenerator.
+
+	* src/main/java/de/intevation/flys/exports/WDifferencesCurveGenerator.java:
+	  Process LONGITUDINAL_W facets.
+
 2011-09-21  Felix Wolfsteller <felix.wolfsteller@intevation.de>
 
  Improved WDifferenceState in preparation to be able to deal with multiple

--- a/flys-artifacts/src/main/java/de/intevation/flys/exports/WDifferencesCurveGenerator.java	Wed Sep 21 13:49:50 2011 +0000
+++ b/flys-artifacts/src/main/java/de/intevation/flys/exports/WDifferencesCurveGenerator.java	Wed Sep 21 13:53:09 2011 +0000
@@ -18,6 +18,16 @@
 import de.intevation.flys.artifacts.model.WKms;
 
 import de.intevation.flys.utils.DataUtil;
+import de.intevation.flys.model.DischargeTable;
+import de.intevation.flys.model.Gauge;
+import de.intevation.flys.model.River;
+import de.intevation.flys.model.TimeInterval;
+
+import de.intevation.flys.artifacts.WINFOArtifact;
+
+import de.intevation.flys.artifacts.model.WQKms;
+import de.intevation.flys.utils.FLYSUtils;
+
 
 
 /**
@@ -80,13 +90,57 @@
         if (name.equals(W_DIFFERENCES)) {
             doWDifferencesOut((WKms) f.getData(artifact, context), f.getDescription(), attr);
         }
-        else {
+        else if (name.equals(LONGITUDINAL_W)) {
+            WINFOArtifact flysArtifact = (WINFOArtifact) artifact;
+            facet = flysArtifact.getNativeFacet(facet);
+
+	    doWaterlevelOut((WQKms) facet.getData(artifact, context), f.getDescription(), attr, flysArtifact);
+
+        }
+       else {
             logger.warn("Unknown facet name: " + name);
             return;
         }
     }
 
 
+    public void doWaterlevelOut(WQKms wqkms,
+         String description,
+         Document theme,
+         WINFOArtifact flysArtifact) {
+        String gaugeName = wqkms.getName();
+
+        River river = FLYSUtils.getRiver(flysArtifact);
+
+        if (river == null) {
+            logger.debug("no river found");
+            return;
+        }
+
+        Gauge gauge = river.determineGaugeByName(gaugeName);
+
+        if (gauge == null) {
+            logger.debug("no gauge found");
+            return;
+        }
+
+        String seriesName = "(tbd)Source for Diff.";
+        //getSeriesName(gauge);
+
+        double [][] values = new double [][] {
+            wqkms.getQs(), wqkms.getWs() };
+
+        int size = values != null ? values[0].length : 0;
+
+        XYSeries series = new StyledXYSeries(seriesName, theme);
+
+        for (int i = 0; i < size; i++) {
+            series.add(values[0][i], values[1][i]);
+        }
+
+        addSecondAxisSeries(series);
+    }
+
     /**
      * Add items to dataseries which describes the differences.
      */