The XAxisValueFormatter interface

The XValueFormatter interface can be used to create custom-made formatter classes that allow to dynamically adjust x-values before drawing them to the screen.

For using the XValueFormatter, simply create a new class and let it implement the interface and return whatever you want to be displayed as a x-axis label from the getXValue(...) method.

Example of a custom formatter

public class MyCustomXValueFormatter implements XValueFormatter {
    
    @Override
    public String getXValue(String original, int index, ViewPortHandler viewPortHandler) {

        // implement your logic here ...
        return ...;
    }
}

Then, set your formatter to the XAxis:

// usage on XAxis, get axis instance:
XAxis xAxis = chart.getXAxis();

// set the formatter
xAxis.setXValueFormatter(new MyCustomXValueFormatter());

Predefined XValueFormatters

• DefaultXValueFormatter

Example XValueFormatters

• MyCustomXValueFormatter