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I have created a pie chart in JFreeChart. However, numerical values are not appearing on the "slices". How do I make it appear there?

codix
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  • What do you mean on the slices? As in directly on the slices, or on a label on the slice? – Jes Aug 19 '11 at 08:51
  • directly. I also want to apply this on a bar chart (on the bar on the other hand) – codix Aug 19 '11 at 08:54

1 Answers1

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On a PiePlot this is possible using a setter setSimpleLabels.

Assuming you have your created chart:

Chart chart = // your created chart
PiePlot plot = (PiePlot) chart.getPlot();
plot.setSimpleLabels(true);

If you need an even more plain look you can use a transparent color for the label shadow, outline and background paint:

plot.setOutlinePaint(new Color(0, 0, 0, 0));
plot.setLabelShadowPaint(new Color(0, 0, 0, 0));
plot.setLabelBackgroundPaint(new Color(0, 0, 0, 0));
plot.setLabelOutlinePaint(new Color(0, 0, 0, 0));

Edit: To display values instead of legends in the slices:

plot.setLabelGenerator(new StandardPieSectionLabelGenerator("{2}"));

The StandardPieSectionLabelGenerator also has a number formatter if you need one of these.

That should do it for a pie chart.

As for a bar chart you can set the label positions on the BarRenderer using the setPositiveItemLabelPositionFallback(ItemLabelPosition position) method. For inside labels you could use:

barRenderer.setPositiveItemLabelPositionFallback(
     new ItemLabelPosition(ItemLabelAnchor.CENTER, TextAnchor.CENTER));

Be sure the font size can fit inside the bar when you try this.

Jes
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  • hmm..so the values that will display is the same as that of the values in the legend? – codix Aug 19 '11 at 10:36
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    See also this [answer](http://stackoverflow.com/questions/3547244/setting-label-and-value-of-the-chart/3551238#3551238). – trashgod Aug 19 '11 at 11:40
  • I used this code for the bar graph but the labels didn't show: CategoryPlot plot = chart.getCategoryPlot(); BarRenderer barRenderer = (BarRenderer) plot.getRenderer(); barRenderer.setNegativeItemLabelPositionFallback( new ItemLabelPosition(ItemLabelAnchor.CENTER, TextAnchor.CENTER));` – codix Aug 22 '11 at 01:40
  • You should try `setPositiveLabelPositionFallback`. If you have the developer manual for JFreeChart, go look up the label anchor/position definitions. – Jes Aug 22 '11 at 10:41