TextAnchor.CENTER, 0.0
            );
            renderer.setPositiveItemLabelPosition(position);
            renderer.setNegativeItemLabelPosition(position);
        }
        if (tooltips) {
            StandardCategoryToolTipGenerator generator 
                = new StandardCategoryToolTipGenerator();
            renderer.setBaseToolTipGenerator(generator);
        }
        if (urls) {
            renderer.setBaseItemURLGenerator(
                new StandardCategoryURLGenerator()
            );
        }

        CategoryPlot plot = new CategoryPlot(
            dataset, categoryAxis, valueAxis, renderer
        );
        plot.clearRangeMarkers();
        Marker baseline = new ValueMarker(0.0);
        baseline.setPaint(Color.black);
        plot.addRangeMarker(baseline, Layer.FOREGROUND);
        plot.setOrientation(orientation);
        JFreeChart chart = new JFreeChart(
            title, JFreeChart.DEFAULT_TITLE_FONT, plot, legend
        );

        return chart;

    }

    /**
     * Creates a polar plot for the specified dataset (x-values interpreted as 
     * angles in degrees).  The chart object returned by this method uses a 
     * {@link PolarPlot} instance as the plot, with a {@link NumberAxis} for 
     * the radial axis.
     *
     * @param title  the chart title (<code>null</code> permitted).
     * @param dataset  the dataset (<code>null</code> permitted).
     * @param legend  legend required?
     * @param tooltips  tooltips required?
     * @param urls  URLs required?
     *
     * @return A chart.
     */
    public static JFreeChart createPolarChart(String title,
                                              XYDataset dataset,
                                              boolean legend,
                                              boolean tooltips,
                                              boolean urls) {

        PolarPlot plot = new PolarPlot();
        plot.setDataset(dataset);
        NumberAxis rangeAxis = new NumberAxis();
        rangeAxis.setAxisLineVisible(false);
        rangeAxis.setTickMarksVisible(false);
        rangeAxis.setTickLabelInsets(new RectangleInsets(0.0, 0.0, 0.0, 0.0));
        plot.setAxis(rangeAxis);
        plot.setRenderer(new DefaultPolarItemRenderer());
        JFreeChart chart = new JFreeChart(
            title, JFreeChart.DEFAULT_TITLE_FONT, plot, legend
        );
        return chart;

    }

    /**
     * Creates a scatter plot with default settings.  The chart object 
     * returned by this method uses an {@link XYPlot} instance as the plot, 
     * with a {@link NumberAxis} for the domain axis, a  {@link NumberAxis} 
     * as the range axis, and an {@link XYLineAndShapeRenderer} as the 
     * renderer.
     *
     * @param title  the chart title (<code>null</code> permitted).
     * @param xAxisLabel  a label for the X-axis (<code>null</code> permitted).
     * @param yAxisLabel  a label for the Y-axis (<code>null</code> permitted).
     * @param dataset  the dataset for the chart (<code>null</code> permitted).
     * @param orientation  the plot orientation (horizontal or vertical) 
     *                     (<code>null</code> NOT permitted).
     * @param legend  a flag specifying whether or not a legend is required.
     * @param tooltips  configure chart to generate tool tips?
     * @param urls  configure chart to generate URLs?
     *
     * @return A scatter plot.
     */
    public static JFreeChart createScatterPlot(String title, String xAxisLabel,
            String yAxisLabel, XYDataset dataset, PlotOrientation orientation,
            boolean legend, boolean tooltips, boolean urls) {

        if (orientation == null) {
            throw new IllegalArgumentException("Null 'orientation' argument.");
        }
        NumberAxis xAxis = new NumberAxis(xAxisLabel);
        xAxis.setAutoRangeIncludesZero(false);
        NumberAxis yAxis = new NumberAxis(yAxisLabel);
        yAxis.setAutoRangeIncludesZero(false);

        XYPlot plot = new XYPlot(dataset, xAxis, yAxis, null);

        XYToolTipGenerator toolTipGenerator = null;
        if (tooltips) {
            toolTipGenerator = new StandardXYToolTipGenerator();
        }

        XYURLGenerator urlGenerator = null;
        if (urls) {
            urlGenerator = new StandardXYURLGenerator();
        }
        XYItemRenderer renderer = new XYLineAndShapeRenderer(false, true);
        renderer.setBaseToolTipGenerator(toolTipGenerator);
        renderer.setURLGenerator(urlGenerator);
        plot.setRenderer(renderer);
        plot.setOrientation(orientation);

        JFreeChart chart = new JFreeChart(title, JFreeChart.DEFAULT_TITLE_FONT,
                plot, legend);
        return chart;

    }

    /**
     * Creates and returns a default instance of an XY bar chart.
     * <P>
     * The chart object returned by this method uses an {@link XYPlot} instance
     * as the plot, with a {@link DateAxis} for the domain axis, a 
     * {@link NumberAxis} as the range axis, and a {@link XYBarRenderer} as the 
     * renderer.
     *
     * @param title  the chart title (<code>null</code> permitted).
     * @param xAxisLabel  a label for the X-axis (<code>null</code> permitted).
     * @param dateAxis  make the domain axis display dates?
     * @param yAxisLabel  a label for the Y-axis (<code>null</code> permitted).
     * @param dataset  the dataset for the chart (<code>null</code> permitted).
     * @param orientation  the orientation (horizontal or vertical) 
     *                     (<code>null</code> NOT permitted).
     * @param legend  a flag specifying whether or not a legend is required.
     * @param tooltips  configure chart to generate tool tips?
     * @param urls  configure chart to generate URLs?
     *
     * @return An XY bar chart.
     */
    public static JFreeChart createXYBarChart(String title,
                                              String xAxisLabel,
                                              boolean dateAxis,
                                              String yAxisLabel,
                                              IntervalXYDataset dataset,
                                              PlotOrientation orientation,
                                              boolean legend,
                                              boolean tooltips,
                                              boolean urls) {

        if (orientation == null) {
            throw new IllegalArgumentException("Null 'orientation' argument.");
        }
        ValueAxis domainAxis = null;
        if (dateAxis) {
            domainAxis = new DateAxis(xAxisLabel);
        }
        else {
            NumberAxis axis = new NumberAxis(xAxisLabel);
            axis.setAutoRangeIncludesZero(false);
            domainAxis = axis;
        }
        ValueAxis valueAxis = new NumberAxis(yAxisLabel);

        XYBarRenderer renderer = new XYBarRenderer();
        if (tooltips) {
            renderer.setBaseToolTipGenerator(new StandardXYToolTipGenerator());
        }
        if (urls) {
            renderer.setURLGenerator(new StandardXYURLGenerator());
        }

        XYPlot plot = new XYPlot(dataset, domainAxis, valueAxis, renderer);
        plot.setOrientation(orientation);

        JFreeChart chart = new JFreeChart(
            title, JFreeChart.DEFAULT_TITLE_FONT, plot, legend
        );

        return chart;

    }

    /**
     * Creates an area chart using an {@link XYDataset}.
     * <P>
     * The chart object returned by this method uses an {@link XYPlot} instance 
     * as the plot, with a {@link NumberAxis} for the domain axis, a 
     * {@link NumberAxis} as the range axis, and a {@link XYAreaRenderer} as 
     * the renderer.
     *
     * @param title  the chart title (<code>null</code> permitted).
     * @param xAxisLabel  a label for the X-axis (<code>null</code> permitted).
     * @param yAxisLabel  a label for the Y-axis (<code>null</code> permitted).
     * @param dataset  the dataset for the chart (<code>null</code> permitted).
     * @param orientation  the plot orientation (horizontal or vertical) 
     *                     (<code>null</code> NOT permitted).
     * @param legend  a flag specifying whether or not a legend is required.
     * @param tooltips  configure chart to generate tool tips?
     * @param urls  configure chart to generate URLs?
     *
     * @return An XY area chart.
     */
    public static JFreeChart createXYAreaChart(String title,
                                               String xAxisLabel,
                                               String yAxisLabel,
                                               XYDataset dataset,
                                               PlotOrientation orientation,
                                               boolean legend,
                                               boolean tooltips,
                                               boolean urls) {

        if (orientation == null) {
            throw new IllegalArgumentException("Null 'orientation' argument.");
        }
        NumberAxis xAxis = new NumberAxis(xAxisLabel);
        xAxis.setAutoRangeIncludesZero(false);
        NumberAxis yAxis = new NumberAxis(yAxisLabel);
        XYPlot plot = new XYPlot(dataset, xAxis, yAxis, null);
        plot.setOrientation(orientation);
        plot.setForegroundAlpha(0.5f);

        XYToolTipGenerator tipGenerator = null;
        if (tooltips) {
            tipGenerator = new StandardXYToolTipGenerator();
        }

        XYURLGenerator urlGenerator = null;
        if (urls) {
            urlGenerator = new StandardXYURLGenerator();
        }

        plot.setRenderer(
            new XYAreaRenderer(XYAreaRenderer.AREA, tipGenerator, urlGenerator)
        );
        JFreeChart chart = new JFreeChart(
            title, JFreeChart.DEFAULT_TITLE_FONT, plot, legend
        );

        return chart;

    }

    /**
     * Creates a stacked XY area plot.  The chart object returned by this 
     * method uses an {@link XYPlot} instance as the plot, with a 
     * {@link NumberAxis} for the domain axis, a {@link NumberAxis} as the
     * range axis, and a {@link StackedXYAreaRenderer} as the renderer.
     *
     * @param title  the chart title (<code>null</code> permitted).
     * @param xAxisLabel  a label for the X-axis (<code>null</code> permitted).
     * @param yAxisLabel  a label for the Y-axis (<code>null</code> permitted).
     * @param dataset  the dataset for the chart (<code>null</code> permitted).
     * @param orientation  the plot orientation (horizontal or vertical) 
     *                     (<code>null</code> NOT permitted).
     * @param legend  a flag specifying whether or not a legend is required.
     * @param tooltips  configure chart to generate tool tips?
     * @param urls  configure chart to generate URLs?
     *
     * @return A stacked XY area chart.
     */
    public static JFreeChart createStackedXYAreaChart(String title,
                                                    String xAxisLabel,
                                                    String yAxisLabel,
                                                    TableXYDataset dataset,
                                                    PlotOrientation orientation,
                                                    boolean legend,
                                                    boolean tooltips,
                                                    boolean urls) {

        if (orientation == null) {
            throw new IllegalArgumentException("Null 'orientation' argument.");
        }
        NumberAxis xAxis = new NumberAxis(xAxisLabel);
        xAxis.setAutoRangeIncludesZero(false);
        xAxis.setLowerMargin(0.0);
        xAxis.setUpperMargin(0.0);
        NumberAxis yAxis = new NumberAxis(yAxisLabel);
        XYToolTipGenerator toolTipGenerator = null;
        if (tooltips) {
            toolTipGenerator = new StandardXYToolTipGenerator();
        }

        XYURLGenerator urlGenerator = null;
        if (urls) {
            urlGenerator = new StandardXYURLGenerator();
        }
        StackedXYAreaRenderer renderer = new StackedXYAreaRenderer(
            XYAreaRenderer.AREA, toolTipGenerator, urlGenerator
        );
        renderer.setOutline(true);
        XYPlo