Example usage for org.jfree.data.category CategoryDataset getColumnCount

List of usage examples for org.jfree.data.category CategoryDataset getColumnCount

  1. HOME
  2. Java
  3. org.jfree
  4. org.jfree.data.category.*
  5. CategoryDataset
  6. getColumnCount

Introduction

In this page you can find the example usage for org.jfree.data.category CategoryDataset getColumnCount.

Prototype

public int getColumnCount();

Source Link

Document

Returns the number of columns in the table.

Usage

From source file:org.jfree.data.general.DatasetUtils.java

/**
 * Calculates the range of values for a dataset where each item is the
 * running total of the items for the current series.
 *
 * @param dataset  the dataset ({@code null} not permitted).
 *
 * @return The range.//from  www  .  j av a2 s.c  o m
 *
 * @see #findRangeBounds(CategoryDataset)
 */
public static Range findCumulativeRangeBounds(CategoryDataset dataset) {
    Args.nullNotPermitted(dataset, "dataset");
    boolean allItemsNull = true; // we'll set this to false if there is at
                                 // least one non-null data item...
    double minimum = 0.0;
    double maximum = 0.0;
    for (int row = 0; row < dataset.getRowCount(); row++) {
        double runningTotal = 0.0;
        for (int column = 0; column <= dataset.getColumnCount() - 1; column++) {
            Number n = dataset.getValue(row, column);
            if (n != null) {
                allItemsNull = false;
                double value = n.doubleValue();
                if (!Double.isNaN(value)) {
                    runningTotal = runningTotal + value;
                    minimum = Math.min(minimum, runningTotal);
                    maximum = Math.max(maximum, runningTotal);
                }
            }
        }
    }
    if (!allItemsNull) {
        return new Range(minimum, maximum);
    } else {
        return null;
    }
}

From source file:org.jfree.data.general.DatasetUtils.java

/**
 * Iterates over the data item of the category dataset to find
 * the range bounds./*from   w  w w. j  a  v  a 2  s  . co  m*/
 *
 * @param dataset  the dataset ({@code null} not permitted).
 * @param includeInterval  a flag that determines whether or not the
 *                         y-interval is taken into account.
 * @param visibleSeriesKeys  the visible series keys.
 *
 * @return The range (possibly {@code null}).
 *
 * @since 1.0.13
 */
public static Range iterateToFindRangeBounds(CategoryDataset dataset, List visibleSeriesKeys,
        boolean includeInterval) {

    Args.nullNotPermitted(dataset, "dataset");
    Args.nullNotPermitted(visibleSeriesKeys, "visibleSeriesKeys");

    double minimum = Double.POSITIVE_INFINITY;
    double maximum = Double.NEGATIVE_INFINITY;
    int columnCount = dataset.getColumnCount();
    if (includeInterval && dataset instanceof BoxAndWhiskerCategoryDataset) {
        // handle special case of BoxAndWhiskerDataset
        BoxAndWhiskerCategoryDataset bx = (BoxAndWhiskerCategoryDataset) dataset;
        Iterator iterator = visibleSeriesKeys.iterator();
        while (iterator.hasNext()) {
            Comparable seriesKey = (Comparable) iterator.next();
            int series = dataset.getRowIndex(seriesKey);
            int itemCount = dataset.getColumnCount();
            for (int item = 0; item < itemCount; item++) {
                Number lvalue = bx.getMinRegularValue(series, item);
                if (lvalue == null) {
                    lvalue = bx.getValue(series, item);
                }
                Number uvalue = bx.getMaxRegularValue(series, item);
                if (uvalue == null) {
                    uvalue = bx.getValue(series, item);
                }
                if (lvalue != null) {
                    minimum = Math.min(minimum, lvalue.doubleValue());
                }
                if (uvalue != null) {
                    maximum = Math.max(maximum, uvalue.doubleValue());
                }
            }
        }
    } else if (includeInterval && dataset instanceof IntervalCategoryDataset) {
        // handle the special case where the dataset has y-intervals that
        // we want to measure
        IntervalCategoryDataset icd = (IntervalCategoryDataset) dataset;
        Number lvalue, uvalue;
        Iterator iterator = visibleSeriesKeys.iterator();
        while (iterator.hasNext()) {
            Comparable seriesKey = (Comparable) iterator.next();
            int series = dataset.getRowIndex(seriesKey);
            for (int column = 0; column < columnCount; column++) {
                lvalue = icd.getStartValue(series, column);
                uvalue = icd.getEndValue(series, column);
                if (lvalue != null && !Double.isNaN(lvalue.doubleValue())) {
                    minimum = Math.min(minimum, lvalue.doubleValue());
                }
                if (uvalue != null && !Double.isNaN(uvalue.doubleValue())) {
                    maximum = Math.max(maximum, uvalue.doubleValue());
                }
            }
        }
    } else if (includeInterval && dataset instanceof MultiValueCategoryDataset) {
        // handle the special case where the dataset has y-intervals that
        // we want to measure
        MultiValueCategoryDataset mvcd = (MultiValueCategoryDataset) dataset;
        Iterator iterator = visibleSeriesKeys.iterator();
        while (iterator.hasNext()) {
            Comparable seriesKey = (Comparable) iterator.next();
            int series = dataset.getRowIndex(seriesKey);
            for (int column = 0; column < columnCount; column++) {
                List values = mvcd.getValues(series, column);
                Iterator valueIterator = values.iterator();
                while (valueIterator.hasNext()) {
                    Object o = valueIterator.next();
                    if (o instanceof Number) {
                        double v = ((Number) o).doubleValue();
                        if (!Double.isNaN(v)) {
                            minimum = Math.min(minimum, v);
                            maximum = Math.max(maximum, v);
                        }
                    }
                }
            }
        }
    } else if (includeInterval && dataset instanceof StatisticalCategoryDataset) {
        // handle the special case where the dataset has y-intervals that
        // we want to measure
        StatisticalCategoryDataset scd = (StatisticalCategoryDataset) dataset;
        Iterator iterator = visibleSeriesKeys.iterator();
        while (iterator.hasNext()) {
            Comparable seriesKey = (Comparable) iterator.next();
            int series = dataset.getRowIndex(seriesKey);
            for (int column = 0; column < columnCount; column++) {
                Number meanN = scd.getMeanValue(series, column);
                if (meanN != null) {
                    double std = 0.0;
                    Number stdN = scd.getStdDevValue(series, column);
                    if (stdN != null) {
                        std = stdN.doubleValue();
                        if (Double.isNaN(std)) {
                            std = 0.0;
                        }
                    }
                    double mean = meanN.doubleValue();
                    if (!Double.isNaN(mean)) {
                        minimum = Math.min(minimum, mean - std);
                        maximum = Math.max(maximum, mean + std);
                    }
                }
            }
        }
    } else {
        // handle the standard case (plain CategoryDataset)
        Iterator iterator = visibleSeriesKeys.iterator();
        while (iterator.hasNext()) {
            Comparable seriesKey = (Comparable) iterator.next();
            int series = dataset.getRowIndex(seriesKey);
            for (int column = 0; column < columnCount; column++) {
                Number value = dataset.getValue(series, column);
                if (value != null) {
                    double v = value.doubleValue();
                    if (!Double.isNaN(v)) {
                        minimum = Math.min(minimum, v);
                        maximum = Math.max(maximum, v);
                    }
                }
            }
        }
    }
    if (minimum == Double.POSITIVE_INFINITY) {
        return null;
    } else {
        return new Range(minimum, maximum);
    }
}

From source file:org.jfree.data.general.DatasetUtilities.java

/**
 * Calculates the range of values for a dataset where each item is the
 * running total of the items for the current series.
 *
 * @param dataset  the dataset (<code>null</code> not permitted).
 *
 * @return The range.//from   w w w . ja v  a  2s. c  o m
 *
 * @see #findRangeBounds(CategoryDataset)
 */
public static Range findCumulativeRangeBounds(CategoryDataset dataset) {
    ParamChecks.nullNotPermitted(dataset, "dataset");
    boolean allItemsNull = true; // we'll set this to false if there is at
                                 // least one non-null data item...
    double minimum = 0.0;
    double maximum = 0.0;
    for (int row = 0; row < dataset.getRowCount(); row++) {
        double runningTotal = 0.0;
        for (int column = 0; column <= dataset.getColumnCount() - 1; column++) {
            Number n = dataset.getValue(row, column);
            if (n != null) {
                allItemsNull = false;
                double value = n.doubleValue();
                if (!Double.isNaN(value)) {
                    runningTotal = runningTotal + value;
                    minimum = Math.min(minimum, runningTotal);
                    maximum = Math.max(maximum, runningTotal);
                }
            }
        }
    }
    if (!allItemsNull) {
        return new Range(minimum, maximum);
    } else {
        return null;
    }
}

From source file:org.jfree.data.general.DatasetUtils.java

/**
 * Returns the minimum range value for the specified dataset.  This is
 * easy if the dataset implements the {@link RangeInfo} interface (a good
 * idea if there is an efficient way to determine the minimum value).
 * Otherwise, it involves iterating over the entire data-set.  Returns
 * {@code null} if all the data values in the dataset are
 * {@code null}./* ww w  . jav  a 2  s  .  co  m*/
 *
 * @param dataset  the dataset ({@code null} not permitted).
 *
 * @return The minimum value (possibly {@code null}).
 */
public static Number findMinimumRangeValue(CategoryDataset dataset) {
    Args.nullNotPermitted(dataset, "dataset");
    if (dataset instanceof RangeInfo) {
        RangeInfo info = (RangeInfo) dataset;
        return new Double(info.getRangeLowerBound(true));
    }

    // hasn't implemented RangeInfo, so we'll have to iterate...
    else {
        double minimum = Double.POSITIVE_INFINITY;
        int seriesCount = dataset.getRowCount();
        int itemCount = dataset.getColumnCount();
        for (int series = 0; series < seriesCount; series++) {
            for (int item = 0; item < itemCount; item++) {
                Number value;
                if (dataset instanceof IntervalCategoryDataset) {
                    IntervalCategoryDataset icd = (IntervalCategoryDataset) dataset;
                    value = icd.getStartValue(series, item);
                } else {
                    value = dataset.getValue(series, item);
                }
                if (value != null) {
                    minimum = Math.min(minimum, value.doubleValue());
                }
            }
        }
        if (minimum == Double.POSITIVE_INFINITY) {
            return null;
        } else {
            return new Double(minimum);
        }

    }

}

From source file:org.jfree.data.general.DatasetUtilities.java

/**
 * Iterates over the data item of the category dataset to find
 * the range bounds./*from   w  w w.  ja  va2  s  .  c  om*/
 *
 * @param dataset  the dataset (<code>null</code> not permitted).
 * @param includeInterval  a flag that determines whether or not the
 *                         y-interval is taken into account.
 * @param visibleSeriesKeys  the visible series keys.
 *
 * @return The range (possibly <code>null</code>).
 *
 * @since 1.0.13
 */
public static Range iterateToFindRangeBounds(CategoryDataset dataset, List visibleSeriesKeys,
        boolean includeInterval) {

    ParamChecks.nullNotPermitted(dataset, "dataset");
    ParamChecks.nullNotPermitted(visibleSeriesKeys, "visibleSeriesKeys");

    double minimum = Double.POSITIVE_INFINITY;
    double maximum = Double.NEGATIVE_INFINITY;
    int columnCount = dataset.getColumnCount();
    if (includeInterval && dataset instanceof BoxAndWhiskerCategoryDataset) {
        // handle special case of BoxAndWhiskerDataset
        BoxAndWhiskerCategoryDataset bx = (BoxAndWhiskerCategoryDataset) dataset;
        Iterator iterator = visibleSeriesKeys.iterator();
        while (iterator.hasNext()) {
            Comparable seriesKey = (Comparable) iterator.next();
            int series = dataset.getRowIndex(seriesKey);
            int itemCount = dataset.getColumnCount();
            for (int item = 0; item < itemCount; item++) {
                Number lvalue = bx.getMinRegularValue(series, item);
                if (lvalue == null) {
                    lvalue = bx.getValue(series, item);
                }
                Number uvalue = bx.getMaxRegularValue(series, item);
                if (uvalue == null) {
                    uvalue = bx.getValue(series, item);
                }
                if (lvalue != null) {
                    minimum = Math.min(minimum, lvalue.doubleValue());
                }
                if (uvalue != null) {
                    maximum = Math.max(maximum, uvalue.doubleValue());
                }
            }
        }
    } else if (includeInterval && dataset instanceof IntervalCategoryDataset) {
        // handle the special case where the dataset has y-intervals that
        // we want to measure
        IntervalCategoryDataset icd = (IntervalCategoryDataset) dataset;
        Number lvalue, uvalue;
        Iterator iterator = visibleSeriesKeys.iterator();
        while (iterator.hasNext()) {
            Comparable seriesKey = (Comparable) iterator.next();
            int series = dataset.getRowIndex(seriesKey);
            for (int column = 0; column < columnCount; column++) {
                lvalue = icd.getStartValue(series, column);
                uvalue = icd.getEndValue(series, column);
                if (lvalue != null && !Double.isNaN(lvalue.doubleValue())) {
                    minimum = Math.min(minimum, lvalue.doubleValue());
                }
                if (uvalue != null && !Double.isNaN(uvalue.doubleValue())) {
                    maximum = Math.max(maximum, uvalue.doubleValue());
                }
            }
        }
    } else if (includeInterval && dataset instanceof MultiValueCategoryDataset) {
        // handle the special case where the dataset has y-intervals that
        // we want to measure
        MultiValueCategoryDataset mvcd = (MultiValueCategoryDataset) dataset;
        Iterator iterator = visibleSeriesKeys.iterator();
        while (iterator.hasNext()) {
            Comparable seriesKey = (Comparable) iterator.next();
            int series = dataset.getRowIndex(seriesKey);
            for (int column = 0; column < columnCount; column++) {
                List values = mvcd.getValues(series, column);
                Iterator valueIterator = values.iterator();
                while (valueIterator.hasNext()) {
                    Object o = valueIterator.next();
                    if (o instanceof Number) {
                        double v = ((Number) o).doubleValue();
                        if (!Double.isNaN(v)) {
                            minimum = Math.min(minimum, v);
                            maximum = Math.max(maximum, v);
                        }
                    }
                }
            }
        }
    } else if (includeInterval && dataset instanceof StatisticalCategoryDataset) {
        // handle the special case where the dataset has y-intervals that
        // we want to measure
        StatisticalCategoryDataset scd = (StatisticalCategoryDataset) dataset;
        Iterator iterator = visibleSeriesKeys.iterator();
        while (iterator.hasNext()) {
            Comparable seriesKey = (Comparable) iterator.next();
            int series = dataset.getRowIndex(seriesKey);
            for (int column = 0; column < columnCount; column++) {
                Number meanN = scd.getMeanValue(series, column);
                if (meanN != null) {
                    double std = 0.0;
                    Number stdN = scd.getStdDevValue(series, column);
                    if (stdN != null) {
                        std = stdN.doubleValue();
                        if (Double.isNaN(std)) {
                            std = 0.0;
                        }
                    }
                    double mean = meanN.doubleValue();
                    if (!Double.isNaN(mean)) {
                        minimum = Math.min(minimum, mean - std);
                        maximum = Math.max(maximum, mean + std);
                    }
                }
            }
        }
    } else {
        // handle the standard case (plain CategoryDataset)
        Iterator iterator = visibleSeriesKeys.iterator();
        while (iterator.hasNext()) {
            Comparable seriesKey = (Comparable) iterator.next();
            int series = dataset.getRowIndex(seriesKey);
            for (int column = 0; column < columnCount; column++) {
                Number value = dataset.getValue(series, column);
                if (value != null) {
                    double v = value.doubleValue();
                    if (!Double.isNaN(v)) {
                        minimum = Math.min(minimum, v);
                        maximum = Math.max(maximum, v);
                    }
                }
            }
        }
    }
    if (minimum == Double.POSITIVE_INFINITY) {
        return null;
    } else {
        return new Range(minimum, maximum);
    }
}

From source file:org.jfree.data.general.DatasetUtilities.java

/**
 * Returns the minimum range value for the specified dataset.  This is
 * easy if the dataset implements the {@link RangeInfo} interface (a good
 * idea if there is an efficient way to determine the minimum value).
 * Otherwise, it involves iterating over the entire data-set.  Returns
 * <code>null</code> if all the data values in the dataset are
 * <code>null</code>.//from   ww  w.  ja  v a2  s .c  om
 *
 * @param dataset  the dataset (<code>null</code> not permitted).
 *
 * @return The minimum value (possibly <code>null</code>).
 */
public static Number findMinimumRangeValue(CategoryDataset dataset) {
    ParamChecks.nullNotPermitted(dataset, "dataset");
    if (dataset instanceof RangeInfo) {
        RangeInfo info = (RangeInfo) dataset;
        return new Double(info.getRangeLowerBound(true));
    }

    // hasn't implemented RangeInfo, so we'll have to iterate...
    else {
        double minimum = Double.POSITIVE_INFINITY;
        int seriesCount = dataset.getRowCount();
        int itemCount = dataset.getColumnCount();
        for (int series = 0; series < seriesCount; series++) {
            for (int item = 0; item < itemCount; item++) {
                Number value;
                if (dataset instanceof IntervalCategoryDataset) {
                    IntervalCategoryDataset icd = (IntervalCategoryDataset) dataset;
                    value = icd.getStartValue(series, item);
                } else {
                    value = dataset.getValue(series, item);
                }
                if (value != null) {
                    minimum = Math.min(minimum, value.doubleValue());
                }
            }
        }
        if (minimum == Double.POSITIVE_INFINITY) {
            return null;
        } else {
            return new Double(minimum);
        }

    }

}

From source file:org.codehaus.mojo.dashboard.report.plugin.chart.StackedBarChartRenderer.java

/**
 * //from ww w. java  2s.com
 */
public void createChart() {

    CategoryDataset categorydataset = (CategoryDataset) this.datasetStrategy.getDataset();
    report = ChartFactory.createStackedBarChart(this.datasetStrategy.getTitle(),
            this.datasetStrategy.getYAxisLabel(), this.datasetStrategy.getXAxisLabel(), categorydataset,
            PlotOrientation.HORIZONTAL, true, true, false);
    // report.setBackgroundPaint( Color.lightGray );
    report.setAntiAlias(false);
    report.setPadding(new RectangleInsets(5.0d, 5.0d, 5.0d, 5.0d));
    CategoryPlot categoryplot = (CategoryPlot) report.getPlot();
    categoryplot.setBackgroundPaint(Color.white);
    categoryplot.setRangeGridlinePaint(Color.lightGray);
    NumberAxis numberaxis = (NumberAxis) categoryplot.getRangeAxis();
    if (datasetStrategy instanceof CloverBarChartStrategy
            || datasetStrategy instanceof MultiCloverBarChartStrategy) {
        numberaxis.setRange(0.0D, StackedBarChartRenderer.NUMBER_AXIS_RANGE);
        numberaxis.setNumberFormatOverride(NumberFormat.getPercentInstance());
    } else {
        numberaxis.setStandardTickUnits(NumberAxis.createIntegerTickUnits());
    }
    numberaxis.setLowerMargin(0.0D);
    StackedBarRenderer stackedbarrenderer = (StackedBarRenderer) categoryplot.getRenderer();
    stackedbarrenderer.setDrawBarOutline(false);
    stackedbarrenderer.setBaseItemLabelsVisible(true);
    stackedbarrenderer.setBaseItemLabelGenerator(new StandardCategoryItemLabelGenerator());
    stackedbarrenderer.setBaseItemLabelFont(StackedBarRenderer.DEFAULT_VALUE_LABEL_FONT.deriveFont(Font.BOLD));
    int height = (categorydataset.getColumnCount() * ChartUtils.STANDARD_BARCHART_ENTRY_HEIGHT * 2)
            + ChartUtils.STANDARD_BARCHART_ADDITIONAL_HEIGHT + 10;
    if (height > ChartUtils.MINIMUM_HEIGHT) {
        super.setHeight(height);
    } else {
        super.setHeight(ChartUtils.MINIMUM_HEIGHT);
    }
    Paint[] paints = this.datasetStrategy.getPaintColor();

    for (int i = 0; i < categorydataset.getRowCount() && i < paints.length; i++) {
        stackedbarrenderer.setSeriesPaint(i, paints[i]);
    }

}

From source file:org.jfree.data.general.DatasetUtils.java

/**
 * Returns the maximum range value for the specified dataset.  This is easy
 * if the dataset implements the {@link RangeInfo} interface (a good idea
 * if there is an efficient way to determine the maximum value).
 * Otherwise, it involves iterating over the entire data-set.  Returns
 * {@code null} if all the data values are {@code null}.
 *
 * @param dataset  the dataset ({@code null} not permitted).
 *
 * @return The maximum value (possibly {@code null}).
 *///from   ww w  .j  av  a  2 s  . com
public static Number findMaximumRangeValue(CategoryDataset dataset) {

    Args.nullNotPermitted(dataset, "dataset");

    // work out the minimum value...
    if (dataset instanceof RangeInfo) {
        RangeInfo info = (RangeInfo) dataset;
        return new Double(info.getRangeUpperBound(true));
    }

    // hasn't implemented RangeInfo, so we'll have to iterate...
    else {

        double maximum = Double.NEGATIVE_INFINITY;
        int seriesCount = dataset.getRowCount();
        int itemCount = dataset.getColumnCount();
        for (int series = 0; series < seriesCount; series++) {
            for (int item = 0; item < itemCount; item++) {
                Number value;
                if (dataset instanceof IntervalCategoryDataset) {
                    IntervalCategoryDataset icd = (IntervalCategoryDataset) dataset;
                    value = icd.getEndValue(series, item);
                } else {
                    value = dataset.getValue(series, item);
                }
                if (value != null) {
                    maximum = Math.max(maximum, value.doubleValue());
                }
            }
        }
        if (maximum == Double.NEGATIVE_INFINITY) {
            return null;
        } else {
            return new Double(maximum);
        }

    }

}

From source file:org.jfree.data.general.DatasetUtilities.java

/**
 * Returns the maximum range value for the specified dataset.  This is easy
 * if the dataset implements the {@link RangeInfo} interface (a good idea
 * if there is an efficient way to determine the maximum value).
 * Otherwise, it involves iterating over the entire data-set.  Returns
 * <code>null</code> if all the data values are <code>null</code>.
 *
 * @param dataset  the dataset (<code>null</code> not permitted).
 *
 * @return The maximum value (possibly <code>null</code>).
 *///from w w w  . j  a va 2 s . c o m
public static Number findMaximumRangeValue(CategoryDataset dataset) {

    ParamChecks.nullNotPermitted(dataset, "dataset");

    // work out the minimum value...
    if (dataset instanceof RangeInfo) {
        RangeInfo info = (RangeInfo) dataset;
        return new Double(info.getRangeUpperBound(true));
    }

    // hasn't implemented RangeInfo, so we'll have to iterate...
    else {

        double maximum = Double.NEGATIVE_INFINITY;
        int seriesCount = dataset.getRowCount();
        int itemCount = dataset.getColumnCount();
        for (int series = 0; series < seriesCount; series++) {
            for (int item = 0; item < itemCount; item++) {
                Number value;
                if (dataset instanceof IntervalCategoryDataset) {
                    IntervalCategoryDataset icd = (IntervalCategoryDataset) dataset;
                    value = icd.getEndValue(series, item);
                } else {
                    value = dataset.getValue(series, item);
                }
                if (value != null) {
                    maximum = Math.max(maximum, value.doubleValue());
                }
            }
        }
        if (maximum == Double.NEGATIVE_INFINITY) {
            return null;
        } else {
            return new Double(maximum);
        }

    }

}

From source file:de.dekarlab.moneybuilder.view.AnalyticsView.java

/**
 * Create pie chart./*from w  ww.j a va2s  .c om*/
 * 
 * @param dataset
 * @param title
 * @return
 */
protected JFreeChart createLineChart(final CategoryDataset dataset, final String title) {
    final JFreeChart chart = ChartFactory.createLineChart("", // chart title
            App.getGuiProp("report.period.lbl"), // domain axis label
            App.getGuiProp("report.value.lbl"), // range axis label
            dataset, // data
            PlotOrientation.VERTICAL, // orientation
            true, // include legend
            true, // tooltips
            false // urls
    );
    final CategoryPlot plot = (CategoryPlot) chart.getPlot();
    plot.setNoDataMessage(App.getGuiProp("report.nodata.msg"));
    plot.setBackgroundPaint(Color.white);
    plot.setBackgroundPaint(Color.white);
    ((NumberAxis) plot.getRangeAxis()).setAutoRangeIncludesZero(false);
    ((CategoryAxis) plot.getDomainAxis()).setMaximumCategoryLabelLines(10);
    ((CategoryAxis) plot.getDomainAxis()).setCategoryLabelPositions(CategoryLabelPositions.DOWN_90);
    plot.setDomainGridlinesVisible(true);
    plot.setDomainGridlinePaint(Color.gray);
    plot.setRangeGridlinePaint(Color.gray);
    plot.setRangeGridlinesVisible(true);
    plot.setRangeZeroBaselinePaint(Color.black);
    plot.setRangeZeroBaselineVisible(true);
    int color = 0;
    CategoryItemRenderer renderer = plot.getRenderer();
    for (int ser = 0; ser < dataset.getColumnCount(); ser++) {
        renderer.setSeriesPaint(ser, COLORS[color]);
        renderer.setSeriesStroke(ser, new BasicStroke(4));
        StandardCategoryItemLabelGenerator gen = new StandardCategoryItemLabelGenerator("{2}",
                NumberFormat.getInstance(Locale.GERMAN)) {
            private static final long serialVersionUID = 1L;

            public String generateLabel(CategoryDataset dataset, int series, int item) {
                if (item % 3 == 0) {
                    return super.generateLabelString(dataset, series, item);
                } else {
                    return null;
                }
            }
        };

        renderer.setSeriesItemLabelGenerator(ser, gen);
        renderer.setSeriesItemLabelsVisible(ser, true);

        color++;
        if (COLORS.length == color) {
            color = 0;
        }
    }
    return chart;
}