#1120 StackedXYAreaRenderer displays null values as zero

[Igor Rodriguez]

StackedXYAreaRenderer displays null values as zero. Displaying a value, even zero, is not appropriate. The problem is even more noticeable with stacked polylines. I'm using version 1.0.16.

See example:

public class StackedPolylineRendererTest {
public static void main( String[] args ) {
final JFreeChart chart = ChartFactory.createStackedXYAreaChart( "Null Values Rendered As Zero", null, null, createDataSet(), PlotOrientation.VERTICAL, true, false, false );
chart.getXYPlot().setRenderer( new StackedXYAreaRenderer(XYAreaRenderer.LINES) );

    final JFrame frame = new JFrame( "Test Rendering Of Null Values" ); 
    frame.setDefaultCloseOperation( WindowConstants.EXIT_ON_CLOSE );
    frame.setPreferredSize( new Dimension( 800, 600 ) );
    frame.add( new ChartPanel( chart ) );
    frame.pack();
    frame.setVisible( true );
}

private static TableXYDataset createDataSet() {
    final XYSeries s = new XYSeries( "Series", true, false ); //$NON-NLS-1$
    s.add( 1, 1 );
    s.add( 2, 2 );
    s.add( 3, null );
    s.add( 4, 4 );
    s.add( 5, 5 );

    final DefaultTableXYDataset dataSet = new DefaultTableXYDataset();
    dataSet.addSeries( s );

    return dataSet;
}

}

[simon04]

Here's a patch for the line case:

diff --git a/source/org/jfree/chart/renderer/xy/StackedXYAreaRenderer.java b/source/org/jfree/chart/renderer/xy/StackedXYAreaRenderer.java
index 0f52175..7398e6c 100644
--- a/source/org/jfree/chart/renderer/xy/StackedXYAreaRenderer.java
+++ b/source/org/jfree/chart/renderer/xy/StackedXYAreaRenderer.java
@@ -476,7 +476,9 @@ public class StackedXYAreaRenderer extends XYAreaRenderer
                     double transY0 = rangeAxis.valueToJava2D(y0 + ph0,
                             dataArea, plot.getRangeAxisEdge());


-                    if (orientation == PlotOrientation.VERTICAL) {
+                    if (Double.isNaN(y0) || nullPoint) {^M
+                        // do nothing^M
+                    } else if (orientation == PlotOrientation.VERTICAL) {^M
                         areaState.getLine().setLine(transX0, transY0, transX1,
                                 transY1);
                     }

---

What is the expected behaviour for areas? The area polygon has to be closed somehow …
Remark: XYAreaRenderer is also affected …