Java Code Examples for org.jfree.chart.axis.ValueAxis#setLowerMargin()

/**
 * Tests the the lower and upper margin settings produce the expected
 * results.
 */
public void testAxisMargins() {
    XYSeries series = new XYSeries("S1");
    series.add(100.0, 1.1);
    series.add(200.0, 2.2);
    XYSeriesCollection dataset = new XYSeriesCollection(series);
    dataset.setIntervalWidth(0.0);
    JFreeChart chart = ChartFactory.createScatterPlot(
        "Title", "X", "Y", dataset, false);
    ValueAxis domainAxis = ((XYPlot) chart.getPlot()).getDomainAxis();
    Range r = domainAxis.getRange();
    assertEquals(110.0, r.getLength(), EPSILON);
    domainAxis.setLowerMargin(0.10);
    domainAxis.setUpperMargin(0.10);
    r = domainAxis.getRange();
    assertEquals(120.0, r.getLength(), EPSILON);
}
 

/**
 * Creates and returns a time series chart.  A time series chart is an
 * {@link XYPlot} with a {@link DateAxis} for the x-axis and a
 * {@link NumberAxis} for the y-axis.  The default renderer is an
 * {@link XYLineAndShapeRenderer}. A convenient dataset to use with this
 * chart is a {@link TimeSeriesCollection}.
 *
 * @param title  the chart title (<code>null</code> permitted).
 * @param timeAxisLabel  a label for the time axis (<code>null</code>
 *                       permitted).
 * @param valueAxisLabel  a label for the value axis (<code>null</code>
 *                        permitted).
 * @param dataset  the dataset for the chart (<code>null</code> permitted).
 * @param legend  a flag specifying whether or not a legend is required.
 *
 * @return A time series chart.
 */
public static JFreeChart createTimeSeriesChart(String title,
        String timeAxisLabel, String valueAxisLabel, XYDataset dataset,
        boolean legend) {

    ValueAxis timeAxis = new DateAxis(timeAxisLabel);
    timeAxis.setLowerMargin(0.02);  // reduce the default margins
    timeAxis.setUpperMargin(0.02);
    NumberAxis valueAxis = new NumberAxis(valueAxisLabel);
    valueAxis.setAutoRangeIncludesZero(false);  // override default
    XYPlot plot = new XYPlot(dataset, timeAxis, valueAxis, null);
    XYToolTipGenerator toolTipGenerator = null;
    toolTipGenerator = StandardXYToolTipGenerator.getTimeSeriesInstance();
    XYLineAndShapeRenderer renderer = new XYLineAndShapeRenderer(true,
            false);
    renderer.setBaseToolTipGenerator(toolTipGenerator);
    plot.setRenderer(renderer);
    JFreeChart chart = new JFreeChart(title, JFreeChart.DEFAULT_TITLE_FONT,
            plot, legend);
    currentTheme.apply(chart);
    return chart;

}
 

/**
 * Tests the the lower and upper margin settings produce the expected 
 * results.
 */
public void testAxisMargins() {
    XYSeries series = new XYSeries("S1");
    series.add(100.0, 1.1);
    series.add(200.0, 2.2);
    XYSeriesCollection dataset = new XYSeriesCollection(series);
    dataset.setIntervalWidth(0.0);
    JFreeChart chart = ChartFactory.createScatterPlot(
        "Title", "X", "Y", dataset, PlotOrientation.VERTICAL, 
        false, false, false
    );
    ValueAxis domainAxis = ((XYPlot) chart.getPlot()).getDomainAxis();
    Range r = domainAxis.getRange();
    assertEquals(110.0, r.getLength(), EPSILON);
    domainAxis.setLowerMargin(0.10);
    domainAxis.setUpperMargin(0.10);
    r = domainAxis.getRange();
    assertEquals(120.0, r.getLength(), EPSILON);
}
 

private static JFreeChart buildChart(
    final String title, final XYDataset lineAndShape, final XYDataset interval,
    final XYItemRenderer lineAndShapeRenderer, final XYItemRenderer intervalRenderer
) {
    final ValueAxis timeAxis = new DateAxis();
    timeAxis.setLowerMargin(0.02);
    timeAxis.setUpperMargin(0.02);

    final NumberAxis valueAxis = new NumberAxis();
    valueAxis.setAutoRangeIncludesZero(false);

    final XYPlot plot = new XYPlot();

    plot.setDomainAxis(0, timeAxis);
    plot.setRangeAxis(0, valueAxis);

    plot.setDataset(0, lineAndShape);
    plot.setRenderer(0, lineAndShapeRenderer);

    plot.setDomainAxis(1, timeAxis);
    plot.setRangeAxis(1, valueAxis);

    plot.setDataset(1, interval);
    plot.setRenderer(1, intervalRenderer);

    return new JFreeChart(title, JFreeChart.DEFAULT_TITLE_FONT, plot, false);
}
 

/**
 * Creates a chart.
 * 
 * @param dataset  a dataset.
 * 
 * @return A chart.
 */
private static JFreeChart createChart(XYDataset dataset) {

    JFreeChart chart = ChartFactory.createTimeSeriesChart(
        "Legal & General Unit Trust Prices",  // title
        "Date",             // x-axis label
        "Price Per Unit",   // y-axis label
        dataset,            // data
        false,               // create legend?
        true,               // generate tooltips?
        false               // generate URLs?
    );

    chart.setBackgroundPaint(Color.white);

    XYPlot plot = (XYPlot) chart.getPlot();
    plot.setBackgroundPaint(Color.lightGray);
    plot.setDomainGridlinePaint(Color.white);
    plot.setRangeGridlinePaint(Color.white);
    plot.setAxisOffset(new RectangleInsets(5.0, 5.0, 5.0, 5.0));
    plot.setDomainCrosshairVisible(true);
    plot.setRangeCrosshairVisible(true);

    LegendTitle lt = new LegendTitle(plot);
    lt.setItemFont(new Font("Dialog", Font.PLAIN, 9));
    lt.setBackgroundPaint(new Color(200, 200, 255, 100));
    lt.setFrame(new BlockBorder(Color.white));
    lt.setPosition(RectangleEdge.BOTTOM);
    XYTitleAnnotation ta = new XYTitleAnnotation(0.98, 0.02, lt, 
            RectangleAnchor.BOTTOM_RIGHT);
    
    ta.setMaxWidth(0.48);
    plot.addAnnotation(ta);

    XYItemRenderer r = plot.getRenderer();
    if (r instanceof XYLineAndShapeRenderer) {
        XYLineAndShapeRenderer renderer = (XYLineAndShapeRenderer) r;
        renderer.setBaseShapesVisible(true);
        renderer.setBaseShapesFilled(true);
    }
    
    DateAxis axis = (DateAxis) plot.getDomainAxis();
    axis.setDateFormatOverride(new SimpleDateFormat("MMM-yyyy"));
    
    ValueAxis yAxis = plot.getRangeAxis();
    yAxis.setLowerMargin(0.35);
    return chart;

}