JFreeChart and Y-axis Units

Question

I have a StackedXYAreaChart that looks like the following:

How do I fo

Answer 1

CategoryPlot plot = chart.getCategoryPlot();

NumberAxis rangeAxis = (NumberAxis) plot.getRangeAxis();

rangeAxis.setTickUnit(new NumberTickUnit(300));

Answer 2

Assuming a NumberAxis, set the tick unit to 25. There's a related example here.

axis.setTickUnit(new NumberTickUnit(25));

Answer 3

I found a solution to my own question. I'm using a CustomTickUnit that formats numbers and adds units to the suffix, e.g. 1000000 becomes 1 GB.

I set up my tick units with the following code, which spaced them out evenly and formatted them appropriately so that they are very readable:

public void setupRangeAxis(NumberAxis rangeAxis) {
  final TickUnits standardUnits = new TickUnits();
  standardUnits.add(new CustomTickUnit(1));
  standardUnits.add(new CustomTickUnit(10));
  standardUnits.add(new CustomTickUnit(100));
  standardUnits.add(new CustomTickUnit(1000)); // Kilo
  standardUnits.add(new CustomTickUnit(10000));
  standardUnits.add(new CustomTickUnit(100000));
  standardUnits.add(new CustomTickUnit(1000000)); // Mega
  standardUnits.add(new CustomTickUnit(10000000));
  standardUnits.add(new CustomTickUnit(100000000));
  standardUnits.add(new CustomTickUnit(1000000000)); // Giga
  standardUnits.add(new CustomTickUnit(10000000000L));
  standardUnits.add(new CustomTickUnit(100000000000L));
  standardUnits.add(new CustomTickUnit(1000000000000L)); // Tera
  standardUnits.add(new CustomTickUnit(10000000000000L));
  standardUnits.add(new CustomTickUnit(100000000000000L));
  standardUnits.add(new CustomTickUnit(1000000000000000L)); // Peta
  standardUnits.add(new CustomTickUnit(10000000000000000L));
  standardUnits.add(new CustomTickUnit(100000000000000000L));
  standardUnits.add(new CustomTickUnit(1000000000000000000L)); // Exa
  rangeAxis.setStandardTickUnits(standardUnits);
}