public GroupedStackedBarRenderer() 
{
             
        super();
        this.seriesToGroupMap = new KeyToGroupMap();
}

Creates a new renderer.

 protected double calculateBarW0(CategoryPlot plot,
    PlotOrientation orientation,
    Rectangle2D dataArea,
    CategoryAxis domainAxis,
    CategoryItemRendererState state,
    int row,
    int column) 
{
        // calculate bar width...
        double space = 0.0;
        if (orientation == PlotOrientation.HORIZONTAL) {
            space = dataArea.getHeight();
        }
        else {
            space = dataArea.getWidth();
        }
        double barW0 = domainAxis.getCategoryStart(column, getColumnCount(),
                dataArea, plot.getDomainAxisEdge());
        int groupCount = this.seriesToGroupMap.getGroupCount();
        int groupIndex = this.seriesToGroupMap.getGroupIndex(
                this.seriesToGroupMap.getGroup(plot.getDataset(
                        plot.getIndexOf(this)).getRowKey(row)));
        int categoryCount = getColumnCount();
        if (groupCount  > 1) {
            double groupGap = space * getItemMargin()
                              / (categoryCount * (groupCount - 1));
            double groupW = calculateSeriesWidth(space, domainAxis,
                    categoryCount, groupCount);
            barW0 = barW0 + groupIndex * (groupW + groupGap)
                          + (groupW / 2.0) - (state.getBarWidth() / 2.0);
        }
        else {
            barW0 = domainAxis.getCategoryMiddle(column, getColumnCount(),
                    dataArea, plot.getDomainAxisEdge())
                    - state.getBarWidth() / 2.0;
        }
        return barW0;
}

Calculates the coordinate of the first "side" of a bar. This will be the minimum x-coordinate for a vertical bar, and the minimum y-coordinate for a horizontal bar.

 protected  void calculateBarWidth(CategoryPlot plot,
    Rectangle2D dataArea,
    int rendererIndex,
    CategoryItemRendererState state) 
{
        // calculate the bar width
        CategoryAxis xAxis = plot.getDomainAxisForDataset(rendererIndex);
        CategoryDataset data = plot.getDataset(rendererIndex);
        if (data != null) {
            PlotOrientation orientation = plot.getOrientation();
            double space = 0.0;
            if (orientation == PlotOrientation.HORIZONTAL) {
                space = dataArea.getHeight();
            }
            else if (orientation == PlotOrientation.VERTICAL) {
                space = dataArea.getWidth();
            }
            double maxWidth = space * getMaximumBarWidth();
            int groups = this.seriesToGroupMap.getGroupCount();
            int categories = data.getColumnCount();
            int columns = groups * categories;
            double categoryMargin = 0.0;
            double itemMargin = 0.0;
            if (categories  > 1) {
                categoryMargin = xAxis.getCategoryMargin();
            }
            if (groups  > 1) {
                itemMargin = getItemMargin();
            }
            double used = space * (1 - xAxis.getLowerMargin()
                                     - xAxis.getUpperMargin()
                                     - categoryMargin - itemMargin);
            if (columns  > 0) {
                state.setBarWidth(Math.min(used / columns, maxWidth));
            }
            else {
                state.setBarWidth(Math.min(used, maxWidth));
            }
        }
}

Calculates the bar width and stores it in the renderer state. We override the method in the base class to take account of the series-to-group mapping.

 public  void drawItem(Graphics2D g2,
    CategoryItemRendererState state,
    Rectangle2D dataArea,
    CategoryPlot plot,
    CategoryAxis domainAxis,
    ValueAxis rangeAxis,
    CategoryDataset dataset,
    int row,
    int column,
    int pass) 
{
        // nothing is drawn for null values...
        Number dataValue = dataset.getValue(row, column);
        if (dataValue == null) {
            return;
        }
        double value = dataValue.doubleValue();
        Comparable group = this.seriesToGroupMap.getGroup(
                dataset.getRowKey(row));
        PlotOrientation orientation = plot.getOrientation();
        double barW0 = calculateBarW0(plot, orientation, dataArea, domainAxis,
                state, row, column);
        double positiveBase = 0.0;
        double negativeBase = 0.0;
        for (int i = 0; i <  row; i++) {
            if (group.equals(this.seriesToGroupMap.getGroup(
                    dataset.getRowKey(i)))) {
                Number v = dataset.getValue(i, column);
                if (v != null) {
                    double d = v.doubleValue();
                    if (d  > 0) {
                        positiveBase = positiveBase + d;
                    }
                    else {
                        negativeBase = negativeBase + d;
                    }
                }
            }
        }
        double translatedBase;
        double translatedValue;
        RectangleEdge location = plot.getRangeAxisEdge();
        if (value  > 0.0) {
            translatedBase = rangeAxis.valueToJava2D(positiveBase, dataArea,
                    location);
            translatedValue = rangeAxis.valueToJava2D(positiveBase + value,
                    dataArea, location);
        }
        else {
            translatedBase = rangeAxis.valueToJava2D(negativeBase, dataArea,
                    location);
            translatedValue = rangeAxis.valueToJava2D(negativeBase + value,
                    dataArea, location);
        }
        double barL0 = Math.min(translatedBase, translatedValue);
        double barLength = Math.max(Math.abs(translatedValue - translatedBase),
                getMinimumBarLength());
        Rectangle2D bar = null;
        if (orientation == PlotOrientation.HORIZONTAL) {
            bar = new Rectangle2D.Double(barL0, barW0, barLength,
                    state.getBarWidth());
        }
        else {
            bar = new Rectangle2D.Double(barW0, barL0, state.getBarWidth(),
                    barLength);
        }
        Paint itemPaint = getItemPaint(row, column);
        if (getGradientPaintTransformer() != null
                && itemPaint instanceof GradientPaint) {
            GradientPaint gp = (GradientPaint) itemPaint;
            itemPaint = getGradientPaintTransformer().transform(gp, bar);
        }
        g2.setPaint(itemPaint);
        g2.fill(bar);
        if (isDrawBarOutline()
                && state.getBarWidth()  > BAR_OUTLINE_WIDTH_THRESHOLD) {
            g2.setStroke(getItemStroke(row, column));
            g2.setPaint(getItemOutlinePaint(row, column));
            g2.draw(bar);
        }
        CategoryItemLabelGenerator generator = getItemLabelGenerator(row,
                column);
        if (generator != null && isItemLabelVisible(row, column)) {
            drawItemLabel(g2, dataset, row, column, plot, generator, bar,
                    (value <  0.0));
        }
        // collect entity and tool tip information...
        if (state.getInfo() != null) {
            EntityCollection entities = state.getEntityCollection();
            if (entities != null) {
                addItemEntity(entities, dataset, row, column, bar);
            }
        }
}

Draws a stacked bar for a specific item.

 public boolean equals(Object obj) 
{
        if (obj == this) {
            return true;
        }
        if (!(obj instanceof GroupedStackedBarRenderer)) {
            return false;
        }
        GroupedStackedBarRenderer that = (GroupedStackedBarRenderer) obj;
        if (!this.seriesToGroupMap.equals(that.seriesToGroupMap)) {
            return false;
        }
        return super.equals(obj);
}

Tests this renderer for equality with an arbitrary object.

 public Range findRangeBounds(CategoryDataset dataset) 
{
        Range r = DatasetUtilities.findStackedRangeBounds(
                dataset, this.seriesToGroupMap);
        return r;
}

Returns the range of values the renderer requires to display all the items from the specified dataset.

 public  void setSeriesToGroupMap(KeyToGroupMap map) 
{
        if (map == null) {
            throw new IllegalArgumentException("Null 'map' argument.");
        }
        this.seriesToGroupMap = map;
        fireChangeEvent();
}

Updates the map used to assign each series to a group, and sends a RendererChangeEvent to all registered listeners.