JFreeChart and Y-axis Units

I have a StackedXYAreaChart that looks like the following:

How do I format the Y-axis units so that they are evenly spaced out and are displayed at certain intervals? For example, instead of displaying units in increments of 1 (e.g. 0, 1, 2, 3, ... 100), I want to display units in increments of 10 or 25 (e.g., 0, 25, 50, 75, 100). Thanks!

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);
}

trashgod

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

axis.setTickUnit(new NumberTickUnit(25));

thulasi

CategoryPlot plot = chart.getCategoryPlot();

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

rangeAxis.setTickUnit(new NumberTickUnit(300));

来源：https://stackoverflow.com/questions/7853145/jfreechart-and-y-axis-units

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