[PATCH 3 of 3] issue1378: Add axis markers for additional long-sect. without Q (e.g. dike heights)

[Wald Commits]

# HG changeset patch
# User Felix Wolfsteller <felix.wolfsteller at intevation.de>
# Date 1377090040 -7200
# Node ID feaf76b70190114058f73756476f3d24c78c06c5
# Parent  281190b96f4dd6098e3879c71493322cd7ab11da
issue1378: Add axis markers for additional long-sect. without Q (e.g. dike heights).

diff -r 281190b96f4d -r feaf76b70190 artifacts/src/main/java/org/dive4elements/river/exports/DischargeCurveGenerator.java
--- a/artifacts/src/main/java/org/dive4elements/river/exports/DischargeCurveGenerator.java	Wed Aug 21 15:00:04 2013 +0200
+++ b/artifacts/src/main/java/org/dive4elements/river/exports/DischargeCurveGenerator.java	Wed Aug 21 15:00:40 2013 +0200
@@ -308,6 +308,28 @@
 
 
     /**
+     * Return true if all values in data[0] are zero or very close to it.
+     * Return false if data is null or empty
+     */
+    private boolean zeroQ(double[][] data) {
+        if (data == null || data.length == 0) {
+            return false;
+        }
+
+        boolean allZero = true;
+
+        double[] qs = data[0];
+        for (double q: qs) {
+            if (Math.abs(q) >= 0.01d) {
+                allZero = false;
+            }
+        }
+
+        return allZero;
+    }
+
+
+    /**
      * Add WQ Data to plot.
      * @param wq data as double[][]
      */
@@ -321,9 +343,32 @@
         double [][] data = (double [][]) wq;
         String title = aaf.getFacetDescription();
 
+        double translate = getCurrentGaugeDatum();
+
+        // If no Q values (all zero) foud, add annotations
+        if (zeroQ(data)) {
+            List<StickyAxisAnnotation> xy = new ArrayList<StickyAxisAnnotation>();
+
+            for (double y: data[1]) {
+                if (translate != 0d) {
+                    y = (y-translate)*100d;
+                }
+
+                xy.add(new StickyAxisAnnotation(
+                    title,
+                    (float) y,
+                    StickyAxisAnnotation.SimpleAxis.Y_AXIS));
+            }
+
+            doAnnotations(
+                new RiverAnnotation(title, xy),
+                aaf, theme, visible);
+            return;
+        }
+
+        // Otherwise add points.
         XYSeries series = new StyledXYSeries(title, theme);
 
-        double translate = getCurrentGaugeDatum();
         if (translate != 0d) {
             StyledSeriesBuilder.addPointsQW(series, data, -translate, 100d);
             addAxisSeries(series, YAXIS.W.idx, visible);