Escala del eje x de JFreeChart

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Solución:

Deberías usar NumberAxisque contiene muchos métodos para definir la escala de su gráfico.

Ejemplo :

// Create an XY Line chart
XYSeries series = new XYSeries("Random Data");
series.add(1.0, 500.2);
series.add(10.0, 694.1);
XYSeriesCollection data = new XYSeriesCollection(series);
JFreeChart chart = ChartFactory.createXYLineChart("XY Series Demo", "X", "Y", data,
                                                  PlotOrientation.VERTICAL, 
                                                  true, true, false);

// Create an NumberAxis
NumberAxis xAxis = new NumberAxis();
xAxis.setTickUnit(new NumberTickUnit(2));

// Assign it to the chart
XYPlot plot = (XYPlot) chart.getPlot();
plot.setDomainAxis(xAxis);

Basado en este ejemplo, aquí hay un sscce que usa setTickUnit() para ajustar la unidad de tick del eje de dominio de forma dinámica, a partir del valor 5.

import java.awt.BorderLayout;
import java.awt.EventQueue;
import java.util.Random;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JSpinner;
import javax.swing.SpinnerNumberModel;
import javax.swing.event.ChangeEvent;
import javax.swing.event.ChangeListener;
import org.jfree.chart.ChartFactory;
import org.jfree.chart.ChartPanel;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.axis.NumberAxis;
import org.jfree.chart.axis.NumberTickUnit;
import org.jfree.chart.plot.PlotOrientation;
import org.jfree.chart.plot.XYPlot;
import org.jfree.data.xy.XYSeries;
import org.jfree.data.xy.XYSeriesCollection;

/** @see https://stackoverflow.com/a/14167983/230513 */
public class SSCCE 

    private static final int COUNT = 100;
    private static final int UNITS = 5;
    private static final Random r = new Random();

    public static void main(String[] args) 
        XYSeries series = new XYSeries("Data");
        for (int i = 0; i < COUNT; i++) 
            series.add(i, r.nextGaussian());
        
        XYSeriesCollection data = new XYSeriesCollection(series);
        final JFreeChart chart = ChartFactory.createXYLineChart("TickUnits",
            "X", "Y", data, PlotOrientation.VERTICAL, true, true, false);
        XYPlot plot = (XYPlot) chart.getPlot();
        final NumberAxis xAxis = (NumberAxis) plot.getDomainAxis();
        xAxis.setTickUnit(new NumberTickUnit(UNITS));
        EventQueue.invokeLater(new Runnable() 

            @Override
            public void run() 
                JFrame f = new JFrame("TickUnitDemo");
                f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                f.add(new ChartPanel(chart));
                final JSpinner spinner = new JSpinner(
                    new SpinnerNumberModel(UNITS, 1, COUNT, 1));
                spinner.addChangeListener(new ChangeListener() 

                    @Override
                    public void stateChanged(ChangeEvent e) 
                        JSpinner s = (JSpinner) e.getSource();
                        Number n = (Number) s.getValue();
                        xAxis.setTickUnit(new NumberTickUnit(n.intValue()));
                    
                );
                JPanel p = new JPanel();
                p.add(new JLabel(chart.getTitle().getText()));
                p.add(spinner);
                f.add(p, BorderLayout.SOUTH);
                f.pack();
                f.setLocationRelativeTo(null);
                f.setVisible(true);
            
        );

    

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