--- a/flys-artifacts/ChangeLog	Thu Feb 02 16:39:50 2012 +0000
+++ b/flys-artifacts/ChangeLog	Fri Feb 03 09:35:46 2012 +0000
@@ -1,3 +1,12 @@
+2012-02-03  Ingo Weinzierl <ingo@intevation.de>
+
+	* src/main/java/de/intevation/flys/exports/ChartHelper.java: Added a
+	  function that expands a given range. Take care on NaN in getRanges().
+
+	* src/main/java/de/intevation/flys/jfree/EnhancedLineAndShapeRenderer.java:
+	  Prevent of NullPointerExceptions in isMinimumShapeVisible() and
+	  isMaximumShapeVisible().
+
 2012-02-02  Ingo Weinzierl <ingo@intevation.de>
 
 	* src/main/java/de/intevation/flys/exports/HistoricalDischargeCurveGenerator.java:

--- a/flys-artifacts/src/main/java/de/intevation/flys/exports/ChartHelper.java	Thu Feb 02 16:39:50 2012 +0000
+++ b/flys-artifacts/src/main/java/de/intevation/flys/exports/ChartHelper.java	Fri Feb 03 09:35:46 2012 +0000
@@ -3,12 +3,17 @@
 import org.jfree.data.Range;
 import org.jfree.data.xy.XYDataset;
 
+import org.apache.log4j.Logger;
+
 
 /**
  * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
  */
 public class ChartHelper {
 
+    private static final Logger logger = Logger.getLogger(ChartHelper.class);
+
+
     /**
      * This method returns the ranges of the XYDataset <i>dataset</i> as array
      * with [xrange, yrange].
@@ -18,20 +23,32 @@
      * @return an array with x and y ranges.
      */
     public static Range[] getRanges(XYDataset dataset) {
-        if (dataset == null) {
+        int seriesCount = dataset != null ? dataset.getSeriesCount() : 0;
+
+        if (seriesCount == 0) {
+            logger.warn("Dataset is empty or has no Series set.");
             return null;
         }
 
+        boolean foundValue = false;
+
         double minX = Double.MAX_VALUE;
         double maxX = -Double.MAX_VALUE;
         double minY = Double.MAX_VALUE;
         double maxY = -Double.MAX_VALUE;
 
-        for (int i = 0, m = dataset.getSeriesCount(); i < m; i++) {
+        for (int i = 0, m = seriesCount; i < m; i++) {
             for (int j = 0, n = dataset.getItemCount(i); j < n; j++) {
                 double x = dataset.getXValue(i, j);
                 double y = dataset.getYValue(i, j);
 
+                if (Double.isNaN(x) || Double.isNaN(y)) {
+                    logger.warn("Item " + j + " in Series " + i + " is broken");
+                    continue;
+                }
+
+                foundValue = true;
+
                 if (x < minX) {
                     minX = x;
                 }
@@ -50,7 +67,31 @@
             }
         }
 
-        return new Range[] { new Range(minX, maxX), new Range(minY, maxY) };
+        return foundValue
+            ? new Range[] { new Range(minX, maxX), new Range(minY, maxY) }
+            : null;
+    }
+
+
+    /**
+     * Expand range by percent.
+     *
+     * @param range The range to expand.
+     * @param percent The percentage to expand.
+     *
+     * @param an expanded range.
+     */
+    public static Range expandRange(Range range, double percent) {
+        if (range == null) {
+            return null;
+        }
+
+        double value  = range.getLowerBound();
+        double expand = Math.abs(value / 100 * percent);
+
+        return expand != 0
+            ? new Range(value-expand, value+expand)
+            : new Range(-0.01 * percent, 0.01 * percent);
     }
 }
 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :

--- a/flys-artifacts/src/main/java/de/intevation/flys/jfree/EnhancedLineAndShapeRenderer.java	Thu Feb 02 16:39:50 2012 +0000
+++ b/flys-artifacts/src/main/java/de/intevation/flys/jfree/EnhancedLineAndShapeRenderer.java	Fri Feb 03 09:35:46 2012 +0000
@@ -158,6 +158,10 @@
 
 
     public boolean isMinimumShapeVisible(int series) {
+        if (this.isMinimumShapeVisible.size() <= series) {
+            return false;
+        }
+
         return isMinimumShapeVisible.getBoolean(series);
     }
 
@@ -168,6 +172,10 @@
 
 
     public boolean isMaximumShapeVisible(int series) {
+        if (this.isMaximumShapeVisible.size() <= series) {
+            return false;
+        }
+
         return isMaximumShapeVisible.getBoolean(series);
     }