How to set user-defined legends of PiePlot?

[farleylai]

The legends of a PiePlot seem to use the values by default. It is not a problem with XYPlot which uses the names of DataSeries as legends but how about PiePlot? Is it possible to set the legends with user-defined strings?

[seifertm]

There are two types of legends in GRAL. XYPlot uses the SeriesLegend by default, which shows an item in the legend for each data series. PiePlot uses ValueLegend, which displays a legend item per value/row in the data series.

ValueLegend does have a possibility to set arbitrary Strings as labels using ValueLegend.setLabelColumn. This denotes the column index of the plot's DataSource where the respective labels are stored.

In your case you would need to create a DataSource with a Double column and a String column and set the label column to the index of the String column:
ValueLegend piePlotLegend = (ValueLegend) piePlot.getLegend();
piePlotLegend.setLabelColumn(1);

The cast is kind of ugly, but it should do the trick.

[farleylai]

Thanks, it works like a charm.