--- a/flys-artifacts/ChangeLog	Tue Mar 20 15:08:01 2012 +0000
+++ b/flys-artifacts/ChangeLog	Thu Mar 22 10:56:20 2012 +0000
@@ -1,3 +1,16 @@
+2012-03-22	Felix Wolfsteller	<felix.wolfsteller@intevation.de>
+
+	Fix flys/issue491, if area fill between curve and axis, draw not only
+	to zero.
+
+	* src/main/java/de/intevation/flys/exports/LongitudinalSectionGenerator.java
+	  (doArea): Add an artificial dataset to set lower bounds for area.
+
+	* src/main/java/de/intevation/flys/exports/StyledSeriesBuilder.java
+	  (addPoints): New convenience method to be used in future.
+	  (createGroundAtInfinity, createCeilingAtInfinity): Create artificial
+	  datasets for better areas.
+
 2012-03-20  Raimund Renkert <raimund.renkert@intevation.de>
 
 	Issue 506.

--- a/flys-artifacts/src/main/java/de/intevation/flys/exports/LongitudinalSectionGenerator.java	Tue Mar 20 15:08:01 2012 +0000
+++ b/flys-artifacts/src/main/java/de/intevation/flys/exports/LongitudinalSectionGenerator.java	Thu Mar 22 10:56:20 2012 +0000
@@ -1,6 +1,5 @@
 package de.intevation.flys.exports;
 
-
 import org.apache.log4j.Logger;
 
 import org.jfree.chart.JFreeChart;
@@ -634,10 +633,12 @@
             area.setMode(StyledAreaSeriesCollection.FILL_MODE.ABOVE);
             down.setKey(seriesName);
             area.addSeries(down);
+            area.addSeries(StyledSeriesBuilder.createGroundAtInfinity(down));
         }
         else if (up != null && down == null) {
             area.setMode(StyledAreaSeriesCollection.FILL_MODE.UNDER);
             area.addSeries(up);
+            area.addSeries(StyledSeriesBuilder.createGroundAtInfinity(up));
         }
         else if (up != null && down != null) {
             if (data.doPaintBetween()) {

--- a/flys-artifacts/src/main/java/de/intevation/flys/exports/StyledSeriesBuilder.java	Tue Mar 20 15:08:01 2012 +0000
+++ b/flys-artifacts/src/main/java/de/intevation/flys/exports/StyledSeriesBuilder.java	Thu Mar 22 10:56:20 2012 +0000
@@ -6,12 +6,20 @@
 
 import de.intevation.flys.artifacts.model.WKms; 
 import de.intevation.flys.artifacts.model.WQKms; 
+import de.intevation.flys.artifacts.model.WWQQ; 
 
 /**
  * Helper to create and modify StyledXYSeries.
  */
 public class StyledSeriesBuilder {
 
+    /**
+     * JFreeChart and the area calculation will fail if we use Double.INFINITY
+     * or Double.MAX_VALUE (probably because these are really used in
+     * calculations). We define and use a more handy value instead.
+     */
+    final static double BIG_DOUBLE_VALUE = 1234567d;
+
     private static final Logger logger = Logger.getLogger
         (StyledSeriesBuilder.class);
 
@@ -101,5 +109,48 @@
             series.add(wqkms.getQ(i), wqkms.getW(i));
         }
     }
+
+
+    /**
+     * Add points to series (q to 1st dim, w to 2nd dim).
+     *
+     * @param series Series to add points to.
+     * @param points Points to add to series.
+     */
+    public static void addPoints(XYSeries series, WWQQ wwqq) {
+        if (wwqq == null) {
+            return;
+        }
+
+        int size = wwqq.size();
+
+        for (int i = 0; i < size; i++) {
+            series.add(wwqq.getW1(i), wwqq.getW2(i));
+        }
+    }
+
+
+    /**
+     * Create a Series such that an infinitely big area can be filled
+     * between the newly created and the given series.
+     */
+    public static XYSeries createGroundAtInfinity(XYSeries series) {
+        XYSeries ground = new XYSeries(series.getKey() + /** TODO rand + */ "INF");
+        ground.add(series.getMinX(), -BIG_DOUBLE_VALUE);
+        ground.add(series.getMaxX(), -BIG_DOUBLE_VALUE);
+        return ground;
+    }
+
+
+    /**
+     * Create a Series such that an infinitely big area can be filled
+     * between the newly created and the given series.
+     */
+    public static XYSeries createCeilingAtInfinity(XYSeries series) {
+        XYSeries ground = new XYSeries(series.getKey() + /** TODO rand + */ "INF");
+        ground.add(series.getMinX(), BIG_DOUBLE_VALUE);
+        ground.add(series.getMaxX(), BIG_DOUBLE_VALUE);
+        return ground;
+    }
 }
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