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JFreeChart with truncated data points

I have created a JFreeChart with the code below, but the Y-Axis marks are truncated. How should I display the chart even though the data points are overlapped in the Y-Axis? Basically, I want the Y-Axis points to be generated from my file, a proper range is populated and displayed in the chart.

private static JFreeChart buildChart(TimeSeriesCollection dataset,
    String title, boolean endPoints) throws IOException {

// Create the chart

    JFreeChart chart0 = ChartFactory.createTimeSeriesChart(
        title, "Hour", "Count", dataset, true, true, false);

// Setup the appearance of the chart
    chart0.setBackgroundPaint(Color.white);
    XYPlot plot = (XYPlot) chart0.getXYPlot();
    plot.setBackgroundPaint(Color.lightGray);
    plot.setDomainGridlinePaint(Color.white);
    plot.setRangeGridlinePaint(Color.white);
    plot.setAxisOffset(new RectangleInsets(10.0, 10.0, 10.0, 10.0));
    plot.setDomainCrosshairVisible(true);
    plot.setRangeCrosshairVisible(true);

// Display data points or just the lines?

    if (endPoints) {
        XYItemRenderer renderer = plot.getRenderer();
        if (renderer instanceof StandardXYItemRenderer) {
            StandardXYItemRenderer rr = (StandardXYItemRenderer) renderer;

            rr.setBaseShapesVisible(true);
            rr.setBaseShapesFilled(true);
            rr.setDrawSeriesLineAsPath(true);
            rr.setSeriesPaint(0, Color.blue.brighter());
            rr.setSeriesVisible(0, true); // default
            rr.setSeriesVisibleInLegend(0, true);  // default

            NumberAxis domainAxis = new NumberAxis();
            domainAxis.setUpperMargin(0.15);
            domainAxis.setStandardTickUnits(NumberAxis.createIntegerTickUnits());
            domainAxis = (NumberAxis) plot.getDomainAxis();
            domainAxis = (NumberAxis) plot.getRangeAxis();
            domainAxis.setAutoRangeIncludesZero(false);
        }
    }

 // Tell the chart how we would like dates to read
    DateAxis axis = (DateAxis) plot.getDomainAxis();
    axis.setAutoRange(true);

 //axis.getDefaultAutoRange();
    axis.setDateFormatOverride(new SimpleDateFormat("HH:mm"));

    try {

        ChartUtilities.saveChartAsJPEG(new File("suc.jpg"), 1.0f, chart0, 990, 700);
    } catch (IOException e) {
        e.printStackTrace();
    }

    return chart0;
}

Below is the image that is created, clearly you can see that the Y-Axis there is an overlap showing.

enter image description here

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Answer

This is my current approach on the chart how data is being rendered…

private static JFreeChart buildChart(TimeSeriesCollection dataset,
    String title, boolean endPoints) throws IOException {
// Create the chart
    JFreeChart chart0 = ChartFactory.createTimeSeriesChart(
        title,
        "Hour", "Count",
        dataset,
        true,
        true,
        false);

// Setup the appearance of the chart

    chart0.setBackgroundPaint(Color.white);
    XYPlot plot = (XYPlot) chart0.getXYPlot();
    plot.getDomainAxis().setAutoRange(true);
    plot.getRangeAxis().setRange(1.0, SucMaxi);
    plot.setBackgroundPaint(Color.lightGray);
    plot.setDomainGridlinePaint(Color.white);
    plot.setRangeGridlinePaint(Color.white);
    plot.getAxisOffset();
    plot.setAxisOffset(new RectangleInsets(10.0, 10.0, 10.0, 10.0));
    plot.setDomainCrosshairVisible(true);
    plot.setRangeCrosshairVisible(true);

// Display data points or just the lines?

    if (endPoints) {
        XYItemRenderer renderer = plot.getRenderer();
        if (renderer instanceof StandardXYItemRenderer) {
            StandardXYItemRenderer rr = (StandardXYItemRenderer) renderer;
            rr.setBaseShapesVisible(true);
            rr.setBaseShapesFilled(true);
            rr.setDrawSeriesLineAsPath(true);
            rr.setSeriesPaint(0, Color.blue.brighter());
            rr.setSeriesVisible(0, true); // default
            rr.setSeriesVisibleInLegend(0, true);  // default      
        }
    }

// Tell the chart how we would like dates to read

    DateAxis axis = (DateAxis) plot.getDomainAxis();

// Tick the X Axis by unit tick 1 hour
    axis.setTickUnit(new DateTickUnit(DateTickUnitType.HOUR, 1));
    axis.setDateFormatOverride(new SimpleDateFormat("HH:mm"));

    try {
        ChartUtilities.saveChartAsJPEG(
            new File("suc.jpg"), 1.0f, chart0, 1000, 700);
    } catch (IOException e) {
        e.printStackTrace();
    }

    return chart0;
}

enter image description here

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