--- a/flys-artifacts/ChangeLog	Tue Sep 27 14:03:06 2011 +0000
+++ b/flys-artifacts/ChangeLog	Tue Sep 27 14:37:18 2011 +0000
@@ -1,3 +1,15 @@
+2011-09-27  Felix Wolfsteller <felix.wolfsteller@intevation.de>
+
+	Enable "auto-scaling" axis for waterlevels in WDifference-plots.
+
+	* src/main/java/de/intevation/flys/exports/LongitudinalSectionGenerator.java:
+	  (createSecondaryAxis, zoomY): Refactored to allow modification in
+	  siblings.
+
+	* src/main/java/de/intevation/flys/exports/WDifferencesCurveGenerator.java:
+	  (createSecondaryAxisRange): Override to achieve expected behavior.
+	  Also adjusted label.
+
 2011-09-27  Felix Wolfsteller <felix.wolfsteller@intevation.de>
 
 	In W-Difference Calculation, respect indices of selected facets.

--- a/flys-artifacts/src/main/java/de/intevation/flys/exports/LongitudinalSectionGenerator.java	Tue Sep 27 14:03:06 2011 +0000
+++ b/flys-artifacts/src/main/java/de/intevation/flys/exports/LongitudinalSectionGenerator.java	Tue Sep 27 14:37:18 2011 +0000
@@ -177,14 +177,24 @@
 
 
     /**
-     * This method overrides the XYChartGenerators zoomY method to include the 0
-     * value on the Q axis.
+     * Create a range that includes 0 (for the Q axis).
+     * @param range range with which to look up upper bound.
+     * @return range with 0 included.
+     */
+    protected Range createSecondAxisRange(Range range) {
+       return new Range(0d, range.getUpperBound());
+    }
+
+
+    /**
+     * This method overrides the XYChartGenerators zoomY method to be able to
+     * modify the range of the Q axis (here, it shall include 0).
      */
     @Override
     protected boolean zoomY(XYPlot plot, ValueAxis axis, Range range, Range x) {
         if (plot.getRangeAxisIndex(axis) == 1) {
-            // we want the Q axis to start at 0 if no zooming has been done
-            range = new Range(0d, range.getUpperBound());
+            // We want the Q axis to start at 0 if no zooming has been done.
+            range = createSecondAxisRange(range);
         }
 
         return super.zoomY(plot, axis, range, x);

--- a/flys-artifacts/src/main/java/de/intevation/flys/exports/WDifferencesCurveGenerator.java	Tue Sep 27 14:03:06 2011 +0000
+++ b/flys-artifacts/src/main/java/de/intevation/flys/exports/WDifferencesCurveGenerator.java	Tue Sep 27 14:37:18 2011 +0000
@@ -6,6 +6,7 @@
 import org.jfree.chart.plot.XYPlot;
 import org.jfree.chart.title.TextTitle;
 import org.jfree.data.xy.XYSeries;
+import org.jfree.data.Range;
 
 import org.w3c.dom.Document;
 
@@ -51,6 +52,7 @@
     public static final String I18N_CHART_TITLE_DEFAULT  = "W-Differenzen";
     public static final String I18N_XAXIS_LABEL_DEFAULT  = "km";
     public static final String I18N_YAXIS_LABEL_DEFAULT  = "W [m]";
+    public static final String I18N_2YAXIS_LABEL_DEFAULT = "W [NN + m]";
 
 
     /**
@@ -180,7 +182,17 @@
         }
     }
 
+    /**
+     * Disable Longitudinals behaviour to include "0" in the Q axis.
+     * @param range range with which to look up upper bound.
+     * @return range to be used for "auto-scaling" axis.
+     */
+    @Override
+    protected Range createSecondAxisRange(Range range) {
+       return new Range(range.getLowerBound(), range.getUpperBound());
+    }
 
+ 
     /**
      * 
      */