Comportamiento anormal de la funcionalidad Acercar y Alejar de JFreeChart?

He observado que la funcionalidad de "Acercar" y "Alejar" se implementó de manera bastante diferente de lo esperado. Por ejemplo, cuando hago un paso de "Alejar" y luego de nuevo un paso atrás de "Zoom- En". No pude ver el gráfico original de nuevo.

No veo la funcionalidad "Acercar" y "Alejar" de JFreechart para estar sincronizado.

public class ChartPanelDemo {

    private static final String title = "Historical Data Graph";
    private ChartPanel chartPanel = createChart();
    private JButton ZoomX;
    private JButton ZoomY;
    private JButton Zoom;
    private JButton ZoomXOut;
    private JButton ZoomYOut;
    private JButton ZoomOut;
    private JButton originalGraph;
    private JButton xscaleInc;
    private JButton xscaleDec;
    private NumberAxis domainAxis;
    private NumberAxis rangeAxis;
    private int UNITS = 1;
    private static final int COUNT = 100;

    private JPanel panel;

    private double[][] sizeFr = { { TableLayout.FILL }, { TableLayout.FILL } };

    public ChartPanelDemo() {
        JFrame f = new JFrame(title);

        panel = new JPanel();
        f.setTitle(title);
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.setLayout(new BorderLayout(0, 5));
        f.add(chartPanel, BorderLayout.CENTER);
        chartPanel.setMouseWheelEnabled(true); 
        // chartPanel.setHorizontalAxisTrace(true);
        // chartPanel.setVerticalAxisTrace(true);
        chartPanel.setZoomInFactor(0.9);
        chartPanel.setZoomOutFactor(0.9);

        JPanel panel = new JPanel(new FlowLayout(FlowLayout.RIGHT));
        panel.add(createTrace());
        panel.add(createDate());
        panel.add(createZoom());
        panel.add(createZoomOutX());
        panel.add(createZoomOutY());
        panel.add(createZoomOut());
        panel.add(toOriginalGraph());
        panel.add(AutoScaleDecXaxis());
        //panel.add(AutoScaleDecXaxis());
        f.add(panel, BorderLayout.SOUTH);
        f.pack();
        f.setLocationRelativeTo(null);
        f.setVisible(true);
    }



    private JSpinner AutoScaleDecXaxis() {
        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();
                    domainAxis.setTickUnit(new NumberTickUnit(n.intValue()));
                }
            });
            return spinner;
    }

    private JButton toOriginalGraph() {
        originalGraph = new JButton(new AbstractAction("RestoreGraph") {

            @Override
            public void actionPerformed(ActionEvent e) {
                chartPanel.restoreAutoBounds();
            }

        });
        return originalGraph;
    }

    private JButton createZoomOut() {
        ZoomOut = new JButton(new AbstractAction("ZoomOut") {

            @Override
            public void actionPerformed(ActionEvent e) {
                ZoomOut.setActionCommand(chartPanel.ZOOM_OUT_BOTH_COMMAND);
                ZoomOut.addActionListener(chartPanel);

            }

        });
        return ZoomOut;
    }

    private JButton createZoomOutY() {
        ZoomYOut = new JButton(new AbstractAction("ZoomOutY") {

            @Override
            public void actionPerformed(ActionEvent e) {
                ZoomYOut.setActionCommand(chartPanel.ZOOM_OUT_RANGE_COMMAND);
                ZoomYOut.addActionListener(chartPanel);
            }

        });
        return ZoomYOut;
    }

    private JButton createZoomOutX() {
        ZoomXOut = new JButton(new AbstractAction("ZoomOutX") {
            @Override
            public void actionPerformed(ActionEvent e) {
                ZoomXOut.setActionCommand(chartPanel.ZOOM_OUT_DOMAIN_COMMAND);
                ZoomXOut.addActionListener(chartPanel);
            }
        });
        return ZoomXOut;
    }

    private JButton createTrace() {
        ZoomX = new JButton(new AbstractAction("ZoomInX") {

            @Override
            public void actionPerformed(ActionEvent e) {
                ZoomX.setActionCommand(chartPanel.ZOOM_IN_DOMAIN_COMMAND);
                ZoomX.addActionListener(chartPanel);
                // chartPanel.restoreAutoBounds();
            }
        });
        return ZoomX;
    }

    private JButton createDate() {
        ZoomY = new JButton(new AbstractAction("ZoomInY") {

            @Override
            public void actionPerformed(ActionEvent e) {
                ZoomY.setActionCommand(chartPanel.ZOOM_IN_RANGE_COMMAND);
                ZoomY.addActionListener(chartPanel);
            }
        });
        return ZoomY;
    }

    private JButton createZoom() {
        Zoom = new JButton(new AbstractAction("Zoom") {

            @Override
            public void actionPerformed(ActionEvent e) {
                Zoom.setActionCommand(chartPanel.ZOOM_IN_BOTH_COMMAND);
                Zoom.addActionListener(chartPanel);
            }
        });
        return Zoom;
    }

    private ChartPanel createChart() {
        XYDataset roiData = createDataset();
        JFreeChart chart = createChart(roiData);
        chart.setBackgroundPaint(new Color(0xBBBBDD));
        XYPlot plot = chart.getXYPlot();
        XYSplineRenderer r = new XYSplineRenderer(20);
        plot.setRenderer(r);
        r.setBaseShapesVisible(true);
        rangeAxis = (NumberAxis) plot.getRangeAxis();
        domainAxis = (NumberAxis) plot.getDomainAxis();
        rangeAxis.setStandardTickUnits(NumberAxis.createIntegerTickUnits());
        domainAxis.setStandardTickUnits(NumberAxis.createIntegerTickUnits());

        return new ChartPanel(chart);
    }

    private JFreeChart createChart(XYDataset dataset) {
        JFreeChart chart = ChartFactory.createXYLineChart("Historical Data", // chart
                                                                                // title
                "X", // x axis label
                "Y", // y axis label
                dataset, // data
                PlotOrientation.VERTICAL, true, // include legend
                true, // tooltips
                false // urls
                );
        return chart;

    }

    private XYDataset createDataset() {
        XYSeries series1 = new XYSeries("First");
        series1.add(1.0, 1.0);
        series1.add(2.0, 4.0);
        series1.add(3.0, 3.0);
        series1.add(4.0, 5.0);
        series1.add(5.0, 5.0);
        series1.add(6.0, 7.0);
        series1.add(7.0, 7.0);
        series1.add(8.0, 8.0);
        XYSeries series2 = new XYSeries("Second");
        series2.add(1.0, 5.0);
        series2.add(2.0, 7.0);
        series2.add(3.0, 6.0);
        series2.add(4.0, 8.0);
        series2.add(5.0, 4.0);
        series2.add(6.0, 4.0);
        series2.add(7.0, 2.0);
        series2.add(8.0, 1.0);

        XYSeriesCollection dataset = new XYSeriesCollection();
        dataset.addSeries(series1);
        dataset.addSeries(series2);

        return dataset;
    }


    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {

            @Override
            public void run() {
                ChartPanelDemo cpd = new ChartPanelDemo();
            }
        });
    }
}

Problem2: después de dos clics en ZoomInX

Y nuevamente después de dos clics en ZoomOutX (que es el gráfico original)

Pero nuevamente, después de dos clics en ZoomInX, veo el gráfico diferente, no como la primera imagen en esta pregunta, que debería ser.

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