Java Code Examples for org.jfree.chart.ChartFactory#createBarChart()

/**
 * This test ensures that a plot with markers is serialized correctly.
 */
@Test
public void testSerialization4() {
    DefaultCategoryDataset dataset = new DefaultCategoryDataset();
    JFreeChart chart = ChartFactory.createBarChart(
            "Test Chart", "Category Axis", "Value Axis",
            dataset, PlotOrientation.VERTICAL, true, true, false);
    CategoryPlot plot = (CategoryPlot) chart.getPlot();
    plot.addRangeMarker(new ValueMarker(1.1), Layer.FOREGROUND);
    plot.addRangeMarker(new IntervalMarker(2.2, 3.3), Layer.BACKGROUND);
    JFreeChart chart2 = (JFreeChart) TestUtilities.serialised(chart);
    assertEquals(chart, chart2);

    // now check that the chart is usable...
    try {
        chart2.createBufferedImage(300, 200);
    }
    catch (Exception e) {
        fail("No exception should be thrown.");
    }
}
 

/**
 * Serialize an instance, restore it, and check for equality.
 */
@Test
public void testSerialization3() {
    DefaultCategoryDataset dataset = new DefaultCategoryDataset();
    JFreeChart chart = ChartFactory.createBarChart(
            "Test Chart", "Category Axis", "Value Axis", dataset,
            PlotOrientation.VERTICAL, true, true, false);
    JFreeChart chart2 = (JFreeChart) TestUtilities.serialised(chart);

    // now check that the chart is usable...
    try {
        chart2.createBufferedImage(300, 200);
    }
    catch (Exception e) {
        fail("No exception should be thrown.");
    }
}
 

/**
 * A simple test for the auto-range calculation looking at a
 * LogAxis used as the range axis for a CategoryPlot.
 */
public void testAutoRange1() {
    DefaultCategoryDataset dataset = new DefaultCategoryDataset();
    dataset.setValue(100.0, "Row 1", "Column 1");
    dataset.setValue(200.0, "Row 1", "Column 2");
    JFreeChart chart = ChartFactory.createBarChart(
        "Test",
        "Categories",
        "Value",
        dataset,
        PlotOrientation.VERTICAL,
        false,
        false,
        false
    );
    CategoryPlot plot = (CategoryPlot) chart.getPlot();
    LogAxis axis = new LogAxis("Log(Y)");
    plot.setRangeAxis(axis);
    assertEquals(0.0, axis.getLowerBound(), EPSILON);
    assertEquals(2.6066426411261268E7, axis.getUpperBound(), EPSILON);
}
 

/**
 * Creates the histogram chart.
 * 
 * @return
 */
private JFreeChart createBarChart() {
	JFreeChart chart = ChartFactory.createBarChart(null, null, null, createBarDataset(), PlotOrientation.VERTICAL,
			false, false, false);
	AbstractAttributeStatisticsModel.setDefaultChartFonts(chart);
	chart.setBackgroundPaint(null);
	chart.setBackgroundImageAlpha(0.0f);

	CategoryPlot plot = (CategoryPlot) chart.getPlot();
	plot.setRangeGridlinesVisible(false);
	plot.setDomainGridlinesVisible(false);
	plot.setOutlineVisible(false);
	plot.setRangeZeroBaselineVisible(false);
	plot.setDomainGridlinesVisible(false);
	plot.setBackgroundPaint(COLOR_INVISIBLE);
	plot.setBackgroundImageAlpha(0.0f);

	BarRenderer renderer = (BarRenderer) plot.getRenderer();
	renderer.setSeriesPaint(0, AttributeGuiTools.getColorForValueType(Ontology.NOMINAL));
	renderer.setBarPainter(new StandardBarPainter());
	renderer.setDrawBarOutline(true);
	renderer.setShadowVisible(false);

	return chart;
}
 

/**
 * Serialize an instance, restore it, and check for equality.
 */
@Test
public void testSerialization3() {
    DefaultCategoryDataset dataset = new DefaultCategoryDataset();
    JFreeChart chart = ChartFactory.createBarChart(
            "Test Chart", "Category Axis", "Value Axis", dataset,
            PlotOrientation.VERTICAL, true, true, false);
    JFreeChart chart2 = (JFreeChart) TestUtilities.serialised(chart);

    // now check that the chart is usable...
    try {
        chart2.createBufferedImage(300, 200);
    }
    catch (Exception e) {
        fail("No exception should be thrown.");
    }
}
 

/**
 * Creates a sample chart.
 *
 * @param dataset  the dataset.
 *
 * @return The chart.
 */
private static JFreeChart createChart(CategoryDataset dataset) {
    JFreeChart chart = ChartFactory.createBarChart(
        "Performance: JFreeSVG vs Batik", null /* x-axis label*/, 
            "Milliseconds" /* y-axis label */, dataset);
    chart.addSubtitle(new TextTitle("Time to generate 1000 charts in SVG " 
            + "format (lower bars = better performance)"));
    chart.setBackgroundPaint(Color.white);
    CategoryPlot plot = (CategoryPlot) chart.getPlot();

    // ******************************************************************
    //  More than 150 demo applications are included with the JFreeChart
    //  Developer Guide...for more information, see:
    //
    //  >   http://www.object-refinery.com/jfreechart/guide.html
    //
    // ******************************************************************

    NumberAxis rangeAxis = (NumberAxis) plot.getRangeAxis();
    rangeAxis.setStandardTickUnits(NumberAxis.createIntegerTickUnits());
    BarRenderer renderer = (BarRenderer) plot.getRenderer();
    renderer.setDrawBarOutline(false);
    chart.getLegend().setFrame(BlockBorder.NONE);
    return chart;
}
 

/**
 * Create a bar chart with sample data in the range -3 to +3.
 *
 * @return The chart.
 */
private static JFreeChart createBarChart() {

    // create a dataset...
    Number[][] data = new Integer[][]
        {{new Integer(-3), new Integer(-2)},
         {new Integer(-1), new Integer(1)},
         {new Integer(2), new Integer(3)}};

    CategoryDataset dataset = DatasetUtilities.createCategoryDataset("S",
            "C", data);

    // create the chart...
    return ChartFactory.createBarChart("Bar Chart", "Domain", "Range",
            dataset, true);

}
 

/**
 * Creates the histogram chart.
 */
private JFreeChart createBarChart() {
	JFreeChart chart = ChartFactory.createBarChart(null, null, null, createBarDataset(), PlotOrientation.VERTICAL,
			false, false, false);
	setDefaultChartFonts(chart);
	chart.setBackgroundPaint(null);
	chart.setBackgroundImageAlpha(0.0f);

	CategoryPlot plot = (CategoryPlot) chart.getPlot();
	plot.setRangeGridlinesVisible(false);
	plot.setDomainGridlinesVisible(false);
	plot.setOutlineVisible(false);
	plot.setRangeZeroBaselineVisible(false);
	plot.setDomainGridlinesVisible(false);
	plot.setBackgroundPaint(COLOR_INVISIBLE);
	plot.setBackgroundImageAlpha(0.0f);

	BarRenderer renderer = (BarRenderer) plot.getRenderer();
	renderer.setSeriesPaint(0, AttributeGuiTools.getColorForValueType(Ontology.NOMINAL));
	renderer.setBarPainter(new StandardBarPainter());
	renderer.setDrawBarOutline(true);
	renderer.setShadowVisible(false);

	return chart;
}
 

/**
 * A simple test for the auto-range calculation looking at a
 * NumberAxis used as the range axis for a CategoryPlot.
 */
@Test
public void testAutoRange1() {
    DefaultCategoryDataset dataset = new DefaultCategoryDataset();
    dataset.setValue(100.0, "Row 1", "Column 1");
    dataset.setValue(200.0, "Row 1", "Column 2");
    JFreeChart chart = ChartFactory.createBarChart("Test", "Categories",
            "Value", dataset);
    CategoryPlot plot = (CategoryPlot) chart.getPlot();
    NumberAxis axis = (NumberAxis) plot.getRangeAxis();
    assertEquals(axis.getLowerBound(), 0.0, EPSILON);
    assertEquals(axis.getUpperBound(), 210.0, EPSILON);
}
 

public JFreeChart getChart() {
    if (chart == null) {
        createDataset();
        chart = ChartFactory.createBarChart(title,
        // chart title
                xLabel,
                // domain axis label
                yLabel,
                // range axis label
                dataset,
                // data
                PlotOrientation.VERTICAL,
                // orientation
                false,
                // include legend
                true,
                // tooltips?
                false
        // URLs?
                );

        CategoryPlot plot = (CategoryPlot) chart.getPlot();
        CategoryAxis rangeAxis = plot.getDomainAxis();
        rangeAxis.setCategoryLabelPositions(CategoryLabelPositions.UP_90);
    }
    return chart;
}
 

/**
 * A simple test for the auto-range calculation looking at a
 * NumberAxis used as the range axis for a CategoryPlot.
 */
@Test
public void testAutoRange1() {
    DefaultCategoryDataset dataset = new DefaultCategoryDataset();
    dataset.setValue(100.0, "Row 1", "Column 1");
    dataset.setValue(200.0, "Row 1", "Column 2");
    JFreeChart chart = ChartFactory.createBarChart("Test", "Categories",
            "Value", dataset);
    CategoryPlot plot = (CategoryPlot) chart.getPlot();
    NumberAxis axis = (NumberAxis) plot.getRangeAxis();
    assertEquals(axis.getLowerBound(), 0.0, EPSILON);
    assertEquals(axis.getUpperBound(), 210.0, EPSILON);
}
 

private JFreeChart createChart() {
	if (data.getItemCount() > 0) {
		// get cumulative percentages
		KeyedValues cumulative = DataUtilities.getCumulativePercentages(data);

		CategoryDataset categoryDataset = DatasetUtilities.createCategoryDataset(
				"Count for " + this.dataTable.getColumnName(this.countColumn) + " = " + countValue, data);

		// create the chart...
		final JFreeChart chart = ChartFactory.createBarChart(null, // chart title
				this.dataTable.getColumnName(this.groupByColumn), // domain axis label
				"Count", // range axis label
				categoryDataset, // data
				PlotOrientation.VERTICAL, true, // include legend
				true, false);

		// set the background color for the chart...
		chart.setBackgroundPaint(Color.WHITE);

		// get a reference to the plot for further customization...
		CategoryPlot plot = chart.getCategoryPlot();

		CategoryAxis domainAxis = plot.getDomainAxis();
		domainAxis.setLowerMargin(0.02);
		domainAxis.setUpperMargin(0.02);
		domainAxis.setLabelFont(LABEL_FONT_BOLD);
		domainAxis.setTickLabelFont(LABEL_FONT);

		// set the range axis to display integers only...
		NumberAxis rangeAxis = (NumberAxis) plot.getRangeAxis();
		rangeAxis.setStandardTickUnits(NumberAxis.createIntegerTickUnits(Locale.US));
		rangeAxis.setLabelFont(LABEL_FONT_BOLD);
		rangeAxis.setTickLabelFont(LABEL_FONT);

		// second data set (cumulative percentages)
		CategoryDataset dataset2 = DatasetUtilities.createCategoryDataset("Cumulative (Percent)", cumulative);

		LineAndShapeRenderer renderer2 = new LineAndShapeRenderer();
		renderer2.setSeriesPaint(0, SwingTools.VERY_DARK_BLUE.darker());

		NumberAxis axis2 = new NumberAxis("Percent of " + countValue);
		axis2.setNumberFormatOverride(NumberFormat.getPercentInstance());
		axis2.setLabelFont(LABEL_FONT_BOLD);
		axis2.setTickLabelFont(LABEL_FONT);

		plot.setRangeAxis(1, axis2);
		plot.setDataset(1, dataset2);
		plot.setRenderer(1, renderer2);
		plot.mapDatasetToRangeAxis(1, 1);

		axis2.setTickUnit(new NumberTickUnit(0.1));

		// show grid lines
		plot.setRangeGridlinesVisible(true);

		// bring cumulative line to front
		plot.setDatasetRenderingOrder(DatasetRenderingOrder.FORWARD);

		if (isLabelRotating()) {
			domainAxis.setTickLabelsVisible(true);
			domainAxis.setCategoryLabelPositions(CategoryLabelPositions.createUpRotationLabelPositions(Math.PI / 2.0d));
		}

		return chart;
	} else {
		return null;
	}
}
 

@Override
public synchronized void run() {

    DefaultCategoryDataset dataset = new DefaultCategoryDataset();

    final JFreeChart chart = ChartFactory.createBarChart(
            getTitle(),
            getEntity(),
            "Value",
            dataset,
            PlotOrientation.VERTICAL,
            true,
            true,
            false
    );

    final CategoryPlot plot = chart.getCategoryPlot();
    plot.setBackgroundPaint(Color.lightGray);
    plot.setDomainGridlinePaint(Color.white);
    plot.setRangeGridlinePaint(Color.white);
    chart.setBackgroundPaint(Color.lightGray);

    ChartFrame frame= new ChartFrame(getTitle(), chart);
    frame.pack();
    frame.setVisible(true);

    while (true) {
        ArrayList<Codelet> tempCodeletsList = new ArrayList<Codelet>();
        tempCodeletsList.addAll(this.getListOfMotivationalEntities());

        synchronized (tempCodeletsList) {

            for (Codelet co : tempCodeletsList) {
                dataset.addValue(co.getActivation(), co.getName(), "activation");
            }
            try {
                Thread.currentThread().sleep(getRefreshPeriod());
            } catch (InterruptedException e) {
                e.printStackTrace();
            }

        }
    }
}
 

private JFreeChart createChart(CategoryDataset categoryDataset) {
  String[] desc = getDescriptors();
  JFreeChart chart = ChartFactory.createBarChart(desc[0], desc[1], desc[2], categoryDataset);
  return chart;
}
 

public JFreeChart createChart(DatasetMap datasetMap) {
	CategoryDataset datasetValue=(CategoryDataset)datasetMap.getDatasets().get("1");
	CategoryDataset datasetCumulative=(CategoryDataset)datasetMap.getDatasets().get("2");


	JFreeChart chart = ChartFactory.createBarChart(
			name,  // chart title
			xLabel,                     // domain axis label
			yLabel,                     // range axis label
			datasetValue,                        // data
			PlotOrientation.VERTICAL,
			true,                           // include legend
			true,
			false
	);

	chart.setBackgroundPaint(Color.white);

	// get a reference to the plot for further customisation...
	CategoryPlot plot = (CategoryPlot) chart.getPlot();
	plot.setBackgroundPaint(Color.lightGray);
	plot.setRangeGridlinePaint(Color.white);
	CategoryAxis domainAxis = plot.getDomainAxis();
	domainAxis.setLowerMargin(0.02);
	domainAxis.setUpperMargin(0.02);
	domainAxis.setCategoryLabelPositions(CategoryLabelPositions.UP_90);
	// set the range axis to display integers only...
	NumberAxis rangeAxis = (NumberAxis) plot.getRangeAxis();
	rangeAxis.setStandardTickUnits(NumberAxis.createIntegerTickUnits());

	LineAndShapeRenderer renderer2 = new LineAndShapeRenderer();

	NumberAxis axis2 = new NumberAxis("Percent");
	axis2.setNumberFormatOverride(NumberFormat.getPercentInstance());
	plot.setRangeAxis(1, axis2);
	plot.setDataset(1, datasetCumulative);
	plot.setRenderer(1, renderer2);
	plot.mapDatasetToRangeAxis(1, 1);

	plot.setDatasetRenderingOrder(DatasetRenderingOrder.FORWARD);
	return chart;   
}
 

/**
 * Creates a sample chart.
 *
 * @param dataset  the dataset.
 *
 * @return The chart.
 */
private static JFreeChart createChart(CategoryDataset dataset) {

    JFreeChart chart = ChartFactory.createBarChart("Bar Chart Demo 1",
            "Category", "Value", dataset, true);                   
    CategoryPlot plot = (CategoryPlot) chart.getPlot();

    // ******************************************************************
    //  More than 150 demo applications are included with the JFreeChart
    //  Developer Guide...for more information, see:
    //
    //  >   http://www.object-refinery.com/jfreechart/guide.html
    //
    // ******************************************************************

    // set the range axis to display integers only...
    NumberAxis rangeAxis = (NumberAxis) plot.getRangeAxis();
    rangeAxis.setStandardTickUnits(NumberAxis.createIntegerTickUnits());

    // disable bar outlines...
    BarRenderer renderer = (BarRenderer) plot.getRenderer();
    renderer.setDrawBarOutline(false);

    // set up gradient paints for series...
    GradientPaint gp0 = new GradientPaint(0.0f, 0.0f, Color.blue,
            0.0f, 0.0f, new Color(0, 0, 64));
    GradientPaint gp1 = new GradientPaint(0.0f, 0.0f, Color.green,
            0.0f, 0.0f, new Color(0, 64, 0));
    GradientPaint gp2 = new GradientPaint(0.0f, 0.0f, Color.red,
            0.0f, 0.0f, new Color(64, 0, 0));
    renderer.setSeriesPaint(0, gp0);
    renderer.setSeriesPaint(1, gp1);
    renderer.setSeriesPaint(2, gp2);

    CategoryAxis domainAxis = plot.getDomainAxis();
    domainAxis.setCategoryLabelPositions(
            CategoryLabelPositions.createUpRotationLabelPositions(
                    Math.PI / 6.0));

    return chart;

}
 

private JFreeChart createChart(CategoryDataset dataset, HttpServletRequest request) {
    JFreeChart chart = ChartFactory.createBarChart(null, null, null, dataset, PlotOrientation.HORIZONTAL, false, false, false);

    CategoryPlot plot = chart.getCategoryPlot();
    Paint background = new GradientPaint(0, 0, Color.lightGray, 0, IMAGE_MIN_HEIGHT, Color.white);
    plot.setBackgroundPaint(background);
    plot.setDomainGridlinePaint(Color.white);
    plot.setDomainGridlinesVisible(true);
    plot.setRangeGridlinePaint(Color.white);
    plot.setRangeAxisLocation(AxisLocation.BOTTOM_OR_LEFT);

    LogarithmicAxis rangeAxis = new LogarithmicAxis(null);
    rangeAxis.setStrictValuesFlag(false);
    rangeAxis.setAllowNegativesFlag(true);
    plot.setRangeAxis(rangeAxis);

    // Disable bar outlines.
    BarRenderer renderer = (BarRenderer) plot.getRenderer();
    renderer.setDrawBarOutline(false);

    // Set up gradient paint for series.
    GradientPaint gp0 = new GradientPaint(
            0.0f, 0.0f, Color.blue,
            0.0f, 0.0f, new Color(0, 0, 64)
    );
    renderer.setSeriesPaint(0, gp0);

    // Rotate labels.
    CategoryAxis domainAxis = plot.getDomainAxis();
    domainAxis.setCategoryLabelPositions(CategoryLabelPositions.createUpRotationLabelPositions(Math.PI / 6.0));

    // Set theme-specific colors.
    Color bgColor = getBackground(request);
    Color fgColor = getForeground(request);

    chart.setBackgroundPaint(bgColor);

    domainAxis.setTickLabelPaint(fgColor);
    domainAxis.setTickMarkPaint(fgColor);
    domainAxis.setAxisLinePaint(fgColor);

    rangeAxis.setTickLabelPaint(fgColor);
    rangeAxis.setTickMarkPaint(fgColor);
    rangeAxis.setAxisLinePaint(fgColor);

    return chart;
}
 

private JFreeChart createNominalChart() {
	JFreeChart chart;
	CategoryDataset dataset = createNominalDataSet();

	// create the chart...
	String domainName = dataTable == null ? MODEL_DOMAIN_AXIS_NAME : dataTable.getColumnName(plotColumn);
	chart = ChartFactory.createBarChart(null, // chart title
			domainName, // x axis label
			RANGE_AXIS_NAME, // y axis label
			dataset, // data
			PlotOrientation.VERTICAL, true, // include legend
			true, // tooltips
			false // urls
			);

	CategoryPlot plot = chart.getCategoryPlot();

	BarRenderer renderer = new BarRenderer();
	if (dataset.getRowCount() == 1) {
		renderer.setSeriesPaint(0, Color.RED);
		renderer.setSeriesFillPaint(0, Color.RED);
	} else {
		for (int i = 0; i < dataset.getRowCount(); i++) {
			Color color = getColorProvider(true).getPointColor((double) i / (double) (dataset.getRowCount() - 1));
			renderer.setSeriesPaint(i, color);
			renderer.setSeriesFillPaint(i, color);
		}
	}
	renderer.setBarPainter(new RapidBarPainter());
	renderer.setDrawBarOutline(true);
	plot.setRenderer(renderer);

	// rotate labels
	if (isLabelRotating()) {
		plot.getDomainAxis().setTickLabelsVisible(true);
		plot.getDomainAxis().setCategoryLabelPositions(
				CategoryLabelPositions.createUpRotationLabelPositions(Math.PI / 2.0d));
	}

	return chart;
}
 

private JFreeChart createProgressChart(Map<String, Integer> chartValues, int aMaxValue,
        boolean aIsPercentage)
{
    // fill dataset
    DefaultCategoryDataset dataset = new DefaultCategoryDataset();
    if (aMaxValue > 0) {
        for (String chartValue : chartValues.keySet()) {
            dataset.setValue(chartValues.get(chartValue), "Completion", chartValue);
        }
    }
    
    // create chart
    JFreeChart chart = ChartFactory.createBarChart(null, null, null, dataset,
            PlotOrientation.HORIZONTAL, false, false, false);

    CategoryPlot plot = chart.getCategoryPlot();
    plot.setOutlineVisible(false);
    plot.setBackgroundPaint(null);
    plot.setNoDataMessage("No data");
    plot.setInsets(new RectangleInsets(0, 20, 0, 20));
    if (aMaxValue > 0) {
        plot.getRangeAxis().setRange(0.0, aMaxValue);
        ((NumberAxis) plot.getRangeAxis()).setNumberFormatOverride(new DecimalFormat("0"));
        // For documents less than 10, avoid repeating the number of documents such
        // as 0 0 1 1 1 - NumberTickUnit automatically determines the range
        if (!aIsPercentage && aMaxValue <= 10) {
            TickUnits standardUnits = new TickUnits();
            NumberAxis tick = new NumberAxis();
            tick.setTickUnit(new NumberTickUnit(1));
            standardUnits.add(tick.getTickUnit());
            plot.getRangeAxis().setStandardTickUnits(standardUnits);
        }
    }
    else {
        plot.getRangeAxis().setVisible(false);
        plot.getDomainAxis().setVisible(false);
    }

    BarRenderer renderer = new BarRenderer();
    renderer.setBarPainter(new StandardBarPainter());
    renderer.setShadowVisible(false);
    // renderer.setGradientPaintTransformer(new
    // StandardGradientPaintTransformer(
    // GradientPaintTransformType.HORIZONTAL));
    renderer.setSeriesPaint(0, Color.BLUE);
    chart.getCategoryPlot().setRenderer(renderer);

    return chart;
}
 

private byte[] createToolAnalysisChart (int width, int height)
{
	CategoryDataset dataset = getToolAnalysisDataSet ();
	
	if (dataset == null) {
		return generateNoDataChart(width, height);
	}
			
	JFreeChart chart = ChartFactory.createBarChart (
			null, // chart title
			null, // domain axis label
			null, // range axis label
			dataset, // data
			PlotOrientation.HORIZONTAL, // the plot orientation
			false, // legend
			false, // tooltips
			false // urls
	);
	
	// set background
	chart.setBackgroundPaint (parseColor (statsManager.getChartBackgroundColor ()));

	// set chart border
	chart.setPadding (new RectangleInsets (10, 5, 5, 5));
	chart.setBorderVisible (true);
	chart.setBorderPaint (parseColor ("#cccccc"));

	// set anti alias
	chart.setAntiAlias (true);

	CategoryPlot plot = (CategoryPlot) chart.getPlot ();

	// set transparency
	plot.setForegroundAlpha (0.7f);
	plot.setAxisOffset (new RectangleInsets (5.0, 5.0, 5.0, 5.0));
	plot.setBackgroundPaint (Color.lightGray);
	plot.setDomainGridlinesVisible (false);
	plot.setRangeGridlinesVisible (true);
	plot.setRangeGridlinePaint (Color.white);
	
       CategoryAxis domainAxis = plot.getDomainAxis();
       domainAxis.setVisible(false);
       domainAxis.setUpperMargin (0);
       domainAxis.setLowerMargin (0);
       
       NumberAxis rangeAxis = (NumberAxis) plot.getRangeAxis();
       rangeAxis.setUpperMargin(0.20);
	rangeAxis.setStandardTickUnits (NumberAxis.createIntegerTickUnits ());
       
       BarRenderer renderer = (BarRenderer) plot.getRenderer();
       CategoryItemLabelGenerator generator 
           = new StandardCategoryItemLabelGenerator("{1}", 
                   NumberFormat.getInstance(new ResourceLoader().getLocale()));
       renderer.setDefaultItemLabelGenerator(generator);
       renderer.setDefaultItemLabelFont(new Font("SansSerif", Font.PLAIN, 9));
       renderer.setDefaultItemLabelsVisible(true);
       renderer.setItemMargin (0);
       renderer.setSeriesPaint (0, Color.BLUE);
       
       BufferedImage img = chart.createBufferedImage (width, height);
	final ByteArrayOutputStream out = new ByteArrayOutputStream();
	try{
		ImageIO.write(img, "png", out);
	}catch(IOException e){
		log.warn("Error occurred while generating SiteStats chart image data", e);
	}
	return out.toByteArray();
}