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src/main/java/fr/soleil/comete/swt/viewers/ChartViewer.java

@@ -5,6 +5,7 @@ import java.awt.event.MouseWheelEvent;
 import java.io.IOException;
 import java.util.ArrayList;
 import java.util.HashMap;
+import java.util.LinkedHashMap;
 import java.util.List;
 import java.util.Map;
 
@@ -406,7 +407,10 @@ public class ChartViewer extends CometeComposite<Control> implements IChartViewe
 
     @Override
     public void addData(Map<String, Object> dataToAdd) {
-        if (data != null && dataToAdd != null) {
+        if (data == null) {
+            data = new LinkedHashMap<String, Object>();
+        }
+        if (dataToAdd != null) {
             data.putAll(dataToAdd);
         }
         setData(data);
@@ -414,9 +418,11 @@ public class ChartViewer extends CometeComposite<Control> implements IChartViewe
 
     @Override
     public void removeData(List<String> idsToRemove) {
+        if (data != null) {
             for (String id : idsToRemove) {
                 data.remove(id);
             }
+        }
         setData(data);
     }
 
@@ -1691,6 +1697,7 @@ public class ChartViewer extends CometeComposite<Control> implements IChartViewe
 
         ChartViewer chartViewer = new ChartViewer(shell, SWT.NONE);
 
+        // mixed x and y values
         double[] t1 = new double[] { 1, 5, 2, 9, 3, 12, 4, 0, 5, 23, 6, 15, 7, 10, 8, 19 };
         double[] t2 = new double[] { 1, 6, 2, -3, 3, 0, 4, 7, 5, 54, 6, 12, 7, 34, 8, 32, 9, 31, 10, 23 };
         Map<String, Object> data = new HashMap<String, Object>();