Question

In JFreeChart, I am using the setRenderAsPercentage(true) option for StackedBarRenderer .
Although the plot itself looks fine (all bars span the whole plot), the range axis labels are not showing percent values (i.e. 0 to 100) but probabilities (i.e. 0 to 1).

How can I achieve percentage values?

Answer 1

You need to set a NumberFormat for the rangeAxis like this:

NumberAxis rangeAxis = new NumberAxis("Count");
...
rangeAxis.setNumberFormatOverride(NumberFormat.getPercentInstance());
...
XYPlot plot = new XYPlot(dataset, domainAxis, rangeAxis, renderer);
...

Or you can do this if you already have a plot

NumberAxis rangeAxis2 = (NumberAxis) plot.getRangeAxis();
rangeAxis2.setNumberFormatOverride(NumberFormat.getPercentInstance());

You should then have an chart that looks like this: