# BoxAndWhiskerRenderer.java

    /* ===========================================================
     * JFreeChart : a free chart library for the Java(tm) platform
     * ===========================================================
     *
     * (C) Copyright 2000-2008, by Object Refinery Limited and Contributors.
     *
     * Project Info:  http://www.jfree.org/jfreechart/index.html
     *
     * This library is free software; you can redistribute it and/or modify it
     * under the terms of the GNU Lesser General Public License as published by
     * the Free Software Foundation; either version 2.1 of the License, or
     * (at your option) any later version.
     *
     * This library is distributed in the hope that it will be useful, but
     * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
     * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
     * License for more details.
     *
     * You should have received a copy of the GNU Lesser General Public
     * License along with this library; if not, write to the Free Software
     * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301,
     * USA.
     *
     * [Java is a trademark or registered trademark of Sun Microsystems, Inc.
     * in the United States and other countries.]
     *
     * --------------------------
     * BoxAndWhiskerRenderer.java
     * --------------------------
     * (C) Copyright 2003-2008, by David Browning and Contributors.
     *
     * Original Author:  David Browning (for the Australian Institute of Marine
     *                   Science);
     * Contributor(s):   David Gilbert (for Object Refinery Limited);
     *                   Tim Bardzil;
     *                   Rob Van der Sanden (patches 1866446 and 1888422);
     *
     * Changes
     * -------
     * 21-Aug-2003 : Version 1, contributed by David Browning (for the Australian
     *               Institute of Marine Science);
     * 01-Sep-2003 : Incorporated outlier and farout symbols for low values
     *               also (DG);
     * 08-Sep-2003 : Changed ValueAxis API (DG);
     * 16-Sep-2003 : Changed ChartRenderingInfo --> PlotRenderingInfo (DG);
     * 07-Oct-2003 : Added renderer state (DG);
     * 12-Nov-2003 : Fixed casting bug reported by Tim Bardzil (DG);
     * 13-Nov-2003 : Added drawHorizontalItem() method contributed by Tim
     *               Bardzil (DG);
     * 25-Apr-2004 : Added fillBox attribute, equals() method and added
     *               serialization code (DG);
     * 29-Apr-2004 : Changed drawing of upper and lower shadows - see bug report
     *               944011 (DG);
     * 05-Nov-2004 : Modified drawItem() signature (DG);
     * 09-Mar-2005 : Override getLegendItem() method so that legend item shapes
     *               are shown as blocks (DG);
     * 20-Apr-2005 : Generate legend labels, tooltips and URLs (DG);
     * 09-Jun-2005 : Updated equals() to handle GradientPaint (DG);
     * ------------- JFREECHART 1.0.x ---------------------------------------------
     * 12-Oct-2006 : Source reformatting and API doc updates (DG);
     * 12-Oct-2006 : Fixed bug 1572478, potential NullPointerException (DG);
     * 05-Feb-2006 : Added event notifications to a couple of methods (DG);
     * 20-Apr-2007 : Updated getLegendItem() for renderer change (DG);
     * 11-May-2007 : Added check for visibility in getLegendItem() (DG);
     * 17-May-2007 : Set datasetIndex and seriesIndex in getLegendItem() (DG);
     * 18-May-2007 : Set dataset and seriesKey for LegendItem (DG);
     * 03-Jan-2008 : Check visibility of average marker before drawing it (DG);
     * 15-Jan-2008 : Add getMaximumBarWidth() and setMaximumBarWidth()
     *               methods (RVdS);
     * 14-Feb-2008 : Fix bar position for horizontal chart, see patch
     *               1888422 (RVdS);
     * 27-Mar-2008 : Boxes should use outlinePaint/Stroke settings (DG);
     *
     */

    package org.jfree.chart.renderer.category;

    import java.awt.Color;
    import java.awt.Graphics2D;
    import java.awt.Paint;
    import java.awt.Shape;
    import java.awt.Stroke;
    import java.awt.geom.Ellipse2D;
    import java.awt.geom.Line2D;
    import java.awt.geom.Point2D;
    import java.awt.geom.Rectangle2D;
    import java.io.IOException;
    import java.io.ObjectInputStream;
    import java.io.ObjectOutputStream;
    import java.io.Serializable;
    import java.util.ArrayList;
    import java.util.Collections;
    import java.util.Iterator;
    import java.util.List;

    import org.jfree.chart.LegendItem;
    import org.jfree.chart.axis.CategoryAxis;
    import org.jfree.chart.axis.ValueAxis;
    import org.jfree.chart.entity.EntityCollection;
    import org.jfree.chart.event.RendererChangeEvent;
    import org.jfree.chart.plot.CategoryPlot;
    import org.jfree.chart.plot.PlotOrientation;
    import org.jfree.chart.plot.PlotRenderingInfo;
    import org.jfree.chart.renderer.Outlier;
    import org.jfree.chart.renderer.OutlierList;
    import org.jfree.chart.renderer.OutlierListCollection;
    import org.jfree.data.category.CategoryDataset;
    import org.jfree.data.statistics.BoxAndWhiskerCategoryDataset;
    import org.jfree.io.SerialUtilities;
    import org.jfree.ui.RectangleEdge;
    import org.jfree.util.PaintUtilities;
    import org.jfree.util.PublicCloneable;

    /**
     * A box-and-whisker renderer.  This renderer requires a
     * {@link BoxAndWhiskerCategoryDataset} and is for use with the
     * {@link CategoryPlot} class.
     */
    public class BoxAndWhiskerRenderer extends AbstractCategoryItemRenderer
            implements Cloneable, PublicCloneable, Serializable {

        /** For serialization. */
        private static final long serialVersionUID = 632027470694481177L;

        /** The color used to paint the median line and average marker. */
        private transient Paint artifactPaint;

        /** A flag that controls whether or not the box is filled. */
        private boolean fillBox;

        /** The margin between items (boxes) within a category. */
        private double itemMargin;

        /**
         * The maximum bar width as percentage of the available space in the plot,
         * where 0.05 is five percent.
         */
        private double maximumBarWidth;

        /**
         * Default constructor.
         */
        public BoxAndWhiskerRenderer() {
            this.artifactPaint = Color.black;
            this.fillBox = true;
            this.itemMargin = 0.20;
            this.maximumBarWidth = 1.0;
        }

        /**
         * Returns the paint used to color the median and average markers.
         *
         * @return The paint used to draw the median and average markers (never
         *     <code>null</code>).
         *
         * @see #setArtifactPaint(Paint)
         */
        public Paint getArtifactPaint() {
            return this.artifactPaint;
        }

        /**
         * Sets the paint used to color the median and average markers and sends
         * a {@link RendererChangeEvent} to all registered listeners.
         *
         * @param paint  the paint (<code>null</code> not permitted).
         *
         * @see #getArtifactPaint()
         */
        public void setArtifactPaint(Paint paint) {
            if (paint == null) {
                throw new IllegalArgumentException("Null 'paint' argument.");
            }
            this.artifactPaint = paint;
            fireChangeEvent();
        }

        /**
         * Returns the flag that controls whether or not the box is filled.
         *
         * @return A boolean.
         *
         * @see #setFillBox(boolean)
         */
        public boolean getFillBox() {
            return this.fillBox;
        }

        /**
         * Sets the flag that controls whether or not the box is filled and sends a
         * {@link RendererChangeEvent} to all registered listeners.
         *
         * @param flag  the flag.
         *
         * @see #getFillBox()
         */
        public void setFillBox(boolean flag) {
            this.fillBox = flag;
            fireChangeEvent();
        }

        /**
         * Returns the item margin.  This is a percentage of the available space
         * that is allocated to the space between items in the chart.
         *
         * @return The margin.
         *
         * @see #setItemMargin(double)
         */
        public double getItemMargin() {
            return this.itemMargin;
        }

        /**
         * Sets the item margin and sends a {@link RendererChangeEvent} to all
         * registered listeners.
         *
         * @param margin  the margin (a percentage).
         *
         * @see #getItemMargin()
         */
        public void setItemMargin(double margin) {
            this.itemMargin = margin;
            fireChangeEvent();
        }

        /**
         * Returns the maximum bar width as a percentage of the available drawing
         * space.
         *
         * @return The maximum bar width.
         *
         * @see #setMaximumBarWidth(double)
         *
         * @since 1.0.10
         */
        public double getMaximumBarWidth() {
            return this.maximumBarWidth;
        }

        /**
         * Sets the maximum bar width, which is specified as a percentage of the
         * available space for all bars, and sends a {@link RendererChangeEvent}
         * to all registered listeners.
         *
         * @param percent  the maximum Bar Width (a percentage).
         *
         * @see #getMaximumBarWidth()
         *
         * @since 1.0.10
         */
        public void setMaximumBarWidth(double percent) {
            this.maximumBarWidth = percent;
            fireChangeEvent();
        }

        /**
         * Returns a legend item for a series.
         *
         * @param datasetIndex  the dataset index (zero-based).
         * @param series  the series index (zero-based).
         *
         * @return The legend item (possibly <code>null</code>).
         */
        public LegendItem getLegendItem(int datasetIndex, int series) {

            CategoryPlot cp = getPlot();
            if (cp == null) {
                return null;
            }

            // check that a legend item needs to be displayed...
            if (!isSeriesVisible(series) || !isSeriesVisibleInLegend(series)) {
                return null;
            }

            CategoryDataset dataset = cp.getDataset(datasetIndex);
            String label = getLegendItemLabelGenerator().generateLabel(dataset,
                    series);
            String description = label;
            String toolTipText = null;
            if (getLegendItemToolTipGenerator() != null) {
                toolTipText = getLegendItemToolTipGenerator().generateLabel(
                        dataset, series);
            }
            String urlText = null;
            if (getLegendItemURLGenerator() != null) {
                urlText = getLegendItemURLGenerator().generateLabel(dataset,
                        series);
            }
            Shape shape = new Rectangle2D.Double(-4.0, -4.0, 8.0, 8.0);
            Paint paint = lookupSeriesPaint(series);
            Paint outlinePaint = lookupSeriesOutlinePaint(series);
            Stroke outlineStroke = lookupSeriesOutlineStroke(series);
            LegendItem result = new LegendItem(label, description, toolTipText,
                    urlText, shape, paint, outlineStroke, outlinePaint);
            result.setDataset(dataset);
            result.setDatasetIndex(datasetIndex);
            result.setSeriesKey(dataset.getRowKey(series));
            result.setSeriesIndex(series);
            return result;

        }

        /**
         * Initialises the renderer.  This method gets called once at the start of
         * the process of drawing a chart.
         *
         * @param g2  the graphics device.
         * @param dataArea  the area in which the data is to be plotted.
         * @param plot  the plot.
         * @param rendererIndex  the renderer index.
         * @param info  collects chart rendering information for return to caller.
         *
         * @return The renderer state.
         */
        public CategoryItemRendererState initialise(Graphics2D g2,
                                                    Rectangle2D dataArea,
                                                    CategoryPlot plot,
                                                    int rendererIndex,
                                                    PlotRenderingInfo info) {

            CategoryItemRendererState state = super.initialise(g2, dataArea, plot,
                    rendererIndex, info);

            // calculate the box width
            CategoryAxis domainAxis = getDomainAxis(plot, rendererIndex);
            CategoryDataset dataset = plot.getDataset(rendererIndex);
            if (dataset != null) {
                int columns = dataset.getColumnCount();
                int rows = dataset.getRowCount();
                double space = 0.0;
                PlotOrientation orientation = plot.getOrientation();
                if (orientation == PlotOrientation.HORIZONTAL) {
                    space = dataArea.getHeight();
                }
                else if (orientation == PlotOrientation.VERTICAL) {
                    space = dataArea.getWidth();
                }
                double maxWidth = space * getMaximumBarWidth();
                double categoryMargin = 0.0;
                double currentItemMargin = 0.0;
                if (columns > 1) {
                    categoryMargin = domainAxis.getCategoryMargin();
                }
                if (rows > 1) {
                    currentItemMargin = getItemMargin();
                }
                double used = space * (1 - domainAxis.getLowerMargin()
                                         - domainAxis.getUpperMargin()
                                         - categoryMargin - currentItemMargin);
                if ((rows * columns) > 0) {
                    state.setBarWidth(Math.min(used / (dataset.getColumnCount()
                            * dataset.getRowCount()), maxWidth));
                }
                else {
                    state.setBarWidth(Math.min(used, maxWidth));
                }
            }

            return state;

        }

        /**
         * Draw a single data item.
         *
         * @param g2  the graphics device.
         * @param state  the renderer state.
         * @param dataArea  the area in which the data is drawn.
         * @param plot  the plot.
         * @param domainAxis  the domain axis.
         * @param rangeAxis  the range axis.
         * @param dataset  the data (must be an instance of
         *                 {@link BoxAndWhiskerCategoryDataset}).
         * @param row  the row index (zero-based).
         * @param column  the column index (zero-based).
         * @param pass  the pass index.
         */
        public void drawItem(Graphics2D g2,
                             CategoryItemRendererState state,
                             Rectangle2D dataArea,
                             CategoryPlot plot,
                             CategoryAxis domainAxis,
                             ValueAxis rangeAxis,
                             CategoryDataset dataset,
                             int row,
                             int column,
                             int pass) {

            if (!(dataset instanceof BoxAndWhiskerCategoryDataset)) {
                throw new IllegalArgumentException(
                        "BoxAndWhiskerRenderer.drawItem() : the data should be "
                        + "of type BoxAndWhiskerCategoryDataset only.");
            }

            PlotOrientation orientation = plot.getOrientation();

            if (orientation == PlotOrientation.HORIZONTAL) {
                drawHorizontalItem(g2, state, dataArea, plot, domainAxis,
                        rangeAxis, dataset, row, column);
            }
            else if (orientation == PlotOrientation.VERTICAL) {
                drawVerticalItem(g2, state, dataArea, plot, domainAxis,
                        rangeAxis, dataset, row, column);
            }

        }

        /**
         * Draws the visual representation of a single data item when the plot has
         * a horizontal orientation.
         *
         * @param g2  the graphics device.
         * @param state  the renderer state.
         * @param dataArea  the area within which the plot is being drawn.
         * @param plot  the plot (can be used to obtain standard color
         *              information etc).
         * @param domainAxis  the domain axis.
         * @param rangeAxis  the range axis.
         * @param dataset  the dataset (must be an instance of
         *                 {@link BoxAndWhiskerCategoryDataset}).
         * @param row  the row index (zero-based).
         * @param column  the column index (zero-based).
         */
        public void drawHorizontalItem(Graphics2D g2,
                                       CategoryItemRendererState state,
                                       Rectangle2D dataArea,
                                       CategoryPlot plot,
                                       CategoryAxis domainAxis,
                                       ValueAxis rangeAxis,
                                       CategoryDataset dataset,
                                       int row,
                                       int column) {

            BoxAndWhiskerCategoryDataset bawDataset
                    = (BoxAndWhiskerCategoryDataset) dataset;

            double categoryEnd = domainAxis.getCategoryEnd(column,
                    getColumnCount(), dataArea, plot.getDomainAxisEdge());
            double categoryStart = domainAxis.getCategoryStart(column,
                    getColumnCount(), dataArea, plot.getDomainAxisEdge());
            double categoryWidth = Math.abs(categoryEnd - categoryStart);

            double yy = categoryStart;
            int seriesCount = getRowCount();
            int categoryCount = getColumnCount();

            if (seriesCount > 1) {
                double seriesGap = dataArea.getHeight() * getItemMargin()
                                   / (categoryCount * (seriesCount - 1));
                double usedWidth = (state.getBarWidth() * seriesCount)
                                   + (seriesGap * (seriesCount - 1));
                // offset the start of the boxes if the total width used is smaller
                // than the category width
                double offset = (categoryWidth - usedWidth) / 2;
                yy = yy + offset + (row * (state.getBarWidth() + seriesGap));
            }
            else {
                // offset the start of the box if the box width is smaller than
                // the category width
                double offset = (categoryWidth - state.getBarWidth()) / 2;
                yy = yy + offset;
            }

            g2.setPaint(getItemPaint(row, column));
            Stroke s = getItemStroke(row, column);
            g2.setStroke(s);

            RectangleEdge location = plot.getRangeAxisEdge();

            Number xQ1 = bawDataset.getQ1Value(row, column);
            Number xQ3 = bawDataset.getQ3Value(row, column);
            Number xMax = bawDataset.getMaxRegularValue(row, column);
            Number xMin = bawDataset.getMinRegularValue(row, column);

            Shape box = null;
            if (xQ1 != null && xQ3 != null && xMax != null && xMin != null) {

                double xxQ1 = rangeAxis.valueToJava2D(xQ1.doubleValue(), dataArea,
                        location);
                double xxQ3 = rangeAxis.valueToJava2D(xQ3.doubleValue(), dataArea,
                        location);
                double xxMax = rangeAxis.valueToJava2D(xMax.doubleValue(), dataArea,
                        location);
                double xxMin = rangeAxis.valueToJava2D(xMin.doubleValue(), dataArea,
                        location);
                double yymid = yy + state.getBarWidth() / 2.0;

                // draw the upper shadow...
                g2.draw(new Line2D.Double(xxMax, yymid, xxQ3, yymid));
                g2.draw(new Line2D.Double(xxMax, yy, xxMax,
                        yy + state.getBarWidth()));

                // draw the lower shadow...
                g2.draw(new Line2D.Double(xxMin, yymid, xxQ1, yymid));
                g2.draw(new Line2D.Double(xxMin, yy, xxMin,
                        yy + state.getBarWidth()));

                // draw the box...
                box = new Rectangle2D.Double(Math.min(xxQ1, xxQ3), yy,
                        Math.abs(xxQ1 - xxQ3), state.getBarWidth());
                if (this.fillBox) {
                    g2.fill(box);
                }
                g2.setStroke(getItemOutlineStroke(row, column));
                g2.setPaint(getItemOutlinePaint(row, column));
                g2.draw(box);
            }

            g2.setPaint(this.artifactPaint);
            double aRadius = 0;                 // average radius

            // draw mean - SPECIAL AIMS REQUIREMENT...
            Number xMean = bawDataset.getMeanValue(row, column);
            if (xMean != null) {
                double xxMean = rangeAxis.valueToJava2D(xMean.doubleValue(),
                        dataArea, location);
                aRadius = state.getBarWidth() / 4;
                // here we check that the average marker will in fact be visible
                // before drawing it...
                if ((xxMean > (dataArea.getMinX() - aRadius))
                        && (xxMean < (dataArea.getMaxX() + aRadius))) {
                    Ellipse2D.Double avgEllipse = new Ellipse2D.Double(xxMean
                            - aRadius, yy + aRadius, aRadius * 2, aRadius * 2);
                    g2.fill(avgEllipse);
                    g2.draw(avgEllipse);
                }
            }

            // draw median...
            Number xMedian = bawDataset.getMedianValue(row, column);
            if (xMedian != null) {
                double xxMedian = rangeAxis.valueToJava2D(xMedian.doubleValue(),
                        dataArea, location);
                g2.draw(new Line2D.Double(xxMedian, yy, xxMedian,
                        yy + state.getBarWidth()));
            }

            // collect entity and tool tip information...
            if (state.getInfo() != null && box != null) {
                EntityCollection entities = state.getEntityCollection();
                if (entities != null) {
                    addItemEntity(entities, dataset, row, column, box);
                }
            }

        }

        /**
         * Draws the visual representation of a single data item when the plot has
         * a vertical orientation.
         *
         * @param g2  the graphics device.
         * @param state  the renderer state.
         * @param dataArea  the area within which the plot is being drawn.
         * @param plot  the plot (can be used to obtain standard color information
         *              etc).
         * @param domainAxis  the domain axis.
         * @param rangeAxis  the range axis.
         * @param dataset  the dataset (must be an instance of
         *                 {@link BoxAndWhiskerCategoryDataset}).
         * @param row  the row index (zero-based).
         * @param column  the column index (zero-based).
         */
        public void drawVerticalItem(Graphics2D g2,
                                     CategoryItemRendererState state,
                                     Rectangle2D dataArea,
                                     CategoryPlot plot,
                                     CategoryAxis domainAxis,
                                     ValueAxis rangeAxis,
                                     CategoryDataset dataset,
                                     int row,
                                     int column) {

            BoxAndWhiskerCategoryDataset bawDataset
                    = (BoxAndWhiskerCategoryDataset) dataset;

            double categoryEnd = domainAxis.getCategoryEnd(column,
                    getColumnCount(), dataArea, plot.getDomainAxisEdge());
            double categoryStart = domainAxis.getCategoryStart(column,
                    getColumnCount(), dataArea, plot.getDomainAxisEdge());
            double categoryWidth = categoryEnd - categoryStart;

            double xx = categoryStart;
            int seriesCount = getRowCount();
            int categoryCount = getColumnCount();

            if (seriesCount > 1) {
                double seriesGap = dataArea.getWidth() * getItemMargin()
                                   / (categoryCount * (seriesCount - 1));
                double usedWidth = (state.getBarWidth() * seriesCount)
                                   + (seriesGap * (seriesCount - 1));
                // offset the start of the boxes if the total width used is smaller
                // than the category width
                double offset = (categoryWidth - usedWidth) / 2;
                xx = xx + offset + (row * (state.getBarWidth() + seriesGap));
            }
            else {
                // offset the start of the box if the box width is smaller than the
                // category width
                double offset = (categoryWidth - state.getBarWidth()) / 2;
                xx = xx + offset;
            }

            double yyAverage = 0.0;
            double yyOutlier;

            Paint itemPaint = getItemPaint(row, column);
            g2.setPaint(itemPaint);
            Stroke s = getItemStroke(row, column);
            g2.setStroke(s);

            double aRadius = 0;                 // average radius

            RectangleEdge location = plot.getRangeAxisEdge();

            Number yQ1 = bawDataset.getQ1Value(row, column);
            Number yQ3 = bawDataset.getQ3Value(row, column);
            Number yMax = bawDataset.getMaxRegularValue(row, column);
            Number yMin = bawDataset.getMinRegularValue(row, column);
            Shape box = null;
            if (yQ1 != null && yQ3 != null && yMax != null && yMin != null) {

                double yyQ1 = rangeAxis.valueToJava2D(yQ1.doubleValue(), dataArea,
                        location);
                double yyQ3 = rangeAxis.valueToJava2D(yQ3.doubleValue(), dataArea,
                        location);
                double yyMax = rangeAxis.valueToJava2D(yMax.doubleValue(),
                        dataArea, location);
                double yyMin = rangeAxis.valueToJava2D(yMin.doubleValue(),
                        dataArea, location);
                double xxmid = xx + state.getBarWidth() / 2.0;

                // draw the upper shadow...
                g2.draw(new Line2D.Double(xxmid, yyMax, xxmid, yyQ3));
                g2.draw(new Line2D.Double(xx, yyMax, xx + state.getBarWidth(),
                        yyMax));

                // draw the lower shadow...
                g2.draw(new Line2D.Double(xxmid, yyMin, xxmid, yyQ1));
                g2.draw(new Line2D.Double(xx, yyMin, xx + state.getBarWidth(),
                        yyMin));

                // draw the body...
                box = new Rectangle2D.Double(xx, Math.min(yyQ1, yyQ3),
                        state.getBarWidth(), Math.abs(yyQ1 - yyQ3));
                if (this.fillBox) {
                    g2.fill(box);
                }
                g2.setStroke(getItemOutlineStroke(row, column));
                g2.setPaint(getItemOutlinePaint(row, column));
                g2.draw(box);
            }

            g2.setPaint(this.artifactPaint);

            // draw mean - SPECIAL AIMS REQUIREMENT...
            Number yMean = bawDataset.getMeanValue(row, column);
            if (yMean != null) {
                yyAverage = rangeAxis.valueToJava2D(yMean.doubleValue(),
                        dataArea, location);
                aRadius = state.getBarWidth() / 4;
                // here we check that the average marker will in fact be visible
                // before drawing it...
                if ((yyAverage > (dataArea.getMinY() - aRadius))
                        && (yyAverage < (dataArea.getMaxY() + aRadius))) {
                    Ellipse2D.Double avgEllipse = new Ellipse2D.Double(xx + aRadius,
                            yyAverage - aRadius, aRadius * 2, aRadius * 2);
                    g2.fill(avgEllipse);
                    g2.draw(avgEllipse);
                }
            }

            // draw median...
            Number yMedian = bawDataset.getMedianValue(row, column);
            if (yMedian != null) {
                double yyMedian = rangeAxis.valueToJava2D(yMedian.doubleValue(),
                        dataArea, location);
                g2.draw(new Line2D.Double(xx, yyMedian, xx + state.getBarWidth(),
                        yyMedian));
            }

            // draw yOutliers...
            double maxAxisValue = rangeAxis.valueToJava2D(
                    rangeAxis.getUpperBound(), dataArea, location) + aRadius;
            double minAxisValue = rangeAxis.valueToJava2D(
                    rangeAxis.getLowerBound(), dataArea, location) - aRadius;

            g2.setPaint(itemPaint);

            // draw outliers
            double oRadius = state.getBarWidth() / 3;    // outlier radius
            List outliers = new ArrayList();
            OutlierListCollection outlierListCollection
                    = new OutlierListCollection();

            // From outlier array sort out which are outliers and put these into a
            // list If there are any farouts, set the flag on the
            // OutlierListCollection
            List yOutliers = bawDataset.getOutliers(row, column);
            if (yOutliers != null) {
                for (int i = 0; i < yOutliers.size(); i++) {
                    double outlier = ((Number) yOutliers.get(i)).doubleValue();
                    Number minOutlier = bawDataset.getMinOutlier(row, column);
                    Number maxOutlier = bawDataset.getMaxOutlier(row, column);
                    Number minRegular = bawDataset.getMinRegularValue(row, column);
                    Number maxRegular = bawDataset.getMaxRegularValue(row, column);
                    if (outlier > maxOutlier.doubleValue()) {
                        outlierListCollection.setHighFarOut(true);
                    }
                    else if (outlier < minOutlier.doubleValue()) {
                        outlierListCollection.setLowFarOut(true);
                    }
                    else if (outlier > maxRegular.doubleValue()) {
                        yyOutlier = rangeAxis.valueToJava2D(outlier, dataArea,
                                location);
                        outliers.add(new Outlier(xx + state.getBarWidth() / 2.0,
                                yyOutlier, oRadius));
                    }
                    else if (outlier < minRegular.doubleValue()) {
                        yyOutlier = rangeAxis.valueToJava2D(outlier, dataArea,
                                location);
                        outliers.add(new Outlier(xx + state.getBarWidth() / 2.0,
                                yyOutlier, oRadius));
                    }
                    Collections.sort(outliers);
                }

                // Process outliers. Each outlier is either added to the
                // appropriate outlier list or a new outlier list is made
                for (Iterator iterator = outliers.iterator(); iterator.hasNext();) {
                    Outlier outlier = (Outlier) iterator.next();
                    outlierListCollection.add(outlier);
                }

                for (Iterator iterator = outlierListCollection.iterator();
                         iterator.hasNext();) {
                    OutlierList list = (OutlierList) iterator.next();
                    Outlier outlier = list.getAveragedOutlier();
                    Point2D point = outlier.getPoint();

                    if (list.isMultiple()) {
                        drawMultipleEllipse(point, state.getBarWidth(), oRadius,
                                g2);
                    }
                    else {
                        drawEllipse(point, oRadius, g2);
                    }
                }

                // draw farout indicators
                if (outlierListCollection.isHighFarOut()) {
                    drawHighFarOut(aRadius / 2.0, g2,
                            xx + state.getBarWidth() / 2.0, maxAxisValue);
                }

                if (outlierListCollection.isLowFarOut()) {
                    drawLowFarOut(aRadius / 2.0, g2,
                            xx + state.getBarWidth() / 2.0, minAxisValue);
                }
            }
            // collect entity and tool tip information...
            if (state.getInfo() != null && box != null) {
                EntityCollection entities = state.getEntityCollection();
                if (entities != null) {
                    addItemEntity(entities, dataset, row, column, box);
                }
            }

        }

        /**
         * Draws a dot to represent an outlier.
         *
         * @param point  the location.
         * @param oRadius  the radius.
         * @param g2  the graphics device.
         */
        private void drawEllipse(Point2D point, double oRadius, Graphics2D g2) {
            Ellipse2D dot = new Ellipse2D.Double(point.getX() + oRadius / 2,
                    point.getY(), oRadius, oRadius);
            g2.draw(dot);
        }

        /**
         * Draws two dots to represent the average value of more than one outlier.
         *
         * @param point  the location
         * @param boxWidth  the box width.
         * @param oRadius  the radius.
         * @param g2  the graphics device.
         */
        private void drawMultipleEllipse(Point2D point, double boxWidth,
                                         double oRadius, Graphics2D g2)  {

            Ellipse2D dot1 = new Ellipse2D.Double(point.getX() - (boxWidth / 2)
                    + oRadius, point.getY(), oRadius, oRadius);
            Ellipse2D dot2 = new Ellipse2D.Double(point.getX() + (boxWidth / 2),
                    point.getY(), oRadius, oRadius);
            g2.draw(dot1);
            g2.draw(dot2);
        }

        /**
         * Draws a triangle to indicate the presence of far-out values.
         *
         * @param aRadius  the radius.
         * @param g2  the graphics device.
         * @param xx  the x coordinate.
         * @param m  the y coordinate.
         */
        private void drawHighFarOut(double aRadius, Graphics2D g2, double xx,
                                    double m) {
            double side = aRadius * 2;
            g2.draw(new Line2D.Double(xx - side, m + side, xx + side, m + side));
            g2.draw(new Line2D.Double(xx - side, m + side, xx, m));
            g2.draw(new Line2D.Double(xx + side, m + side, xx, m));
        }

        /**
         * Draws a triangle to indicate the presence of far-out values.
         *
         * @param aRadius  the radius.
         * @param g2  the graphics device.
         * @param xx  the x coordinate.
         * @param m  the y coordinate.
         */
        private void drawLowFarOut(double aRadius, Graphics2D g2, double xx,
                                   double m) {
            double side = aRadius * 2;
            g2.draw(new Line2D.Double(xx - side, m - side, xx + side, m - side));
            g2.draw(new Line2D.Double(xx - side, m - side, xx, m));
            g2.draw(new Line2D.Double(xx + side, m - side, xx, m));
        }

        /**
         * Tests this renderer for equality with an arbitrary object.
         *
         * @param obj  the object (<code>null</code> permitted).
         *
         * @return <code>true</code> or <code>false</code>.
         */
        public boolean equals(Object obj) {
            if (obj == this) {
                return true;
            }
            if (!(obj instanceof BoxAndWhiskerRenderer)) {
                return false;
            }
            if (!super.equals(obj)) {
                return false;
            }
            BoxAndWhiskerRenderer that = (BoxAndWhiskerRenderer) obj;
            if (!PaintUtilities.equal(this.artifactPaint, that.artifactPaint)) {
                return false;
            }
            if (this.fillBox != that.fillBox) {
                return false;
            }
            if (this.itemMargin != that.itemMargin) {
                return false;
            }
            if (this.maximumBarWidth != that.maximumBarWidth) {
                return false;
            }
            return true;
        }

        /**
         * Provides serialization support.
         *
         * @param stream  the output stream.
         *
         * @throws IOException  if there is an I/O error.
         */
        private void writeObject(ObjectOutputStream stream) throws IOException {
            stream.defaultWriteObject();
            SerialUtilities.writePaint(this.artifactPaint, stream);
        }

        /**
         * Provides serialization support.
         *
         * @param stream  the input stream.
         *
         * @throws IOException  if there is an I/O error.
         * @throws ClassNotFoundException  if there is a classpath problem.
         */
        private void readObject(ObjectInputStream stream)
                throws IOException, ClassNotFoundException {
            stream.defaultReadObject();
            this.artifactPaint = SerialUtilities.readPaint(stream);
        }

    }