edu.dlnu.liuwenpeng.render.NewXYBarRenderer.java Source code

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/* ===========================================================    
* JFreeChart : a free chart library for the Java(tm) platform    
* ===========================================================    
*    
* (C) Copyright 2000-2007, 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.]    
*    
* ------------------    
* XYBarRenderer.java    
* ------------------    
* (C) Copyright 2001-2007, by Object Refinery Limited.    
*    
* Original Author:  David Gilbert (for Object Refinery Limited);    
* Contributor(s):   Richard Atkinson;    
*                   Christian W. Zuckschwerdt;    
*                   Bill Kelemen;    
*                   Marc van Glabbeek (bug 1775452);    
*                   Richard West, Advanced Micro Devices, Inc.;    
*    
* Changes    
* -------    
* 13-Dec-2001 : Version 1, makes VerticalXYBarPlot class redundant (DG);    
* 23-Jan-2002 : Added DrawInfo parameter to drawItem() method (DG);    
* 09-Apr-2002 : Removed the translated zero from the drawItem method. Override     
*               the initialise() method to calculate it (DG);    
* 24-May-2002 : Incorporated tooltips into chart entities (DG);    
* 25-Jun-2002 : Removed redundant import (DG);    
* 05-Aug-2002 : Small modification to drawItem method to support URLs for HTML     
*               image maps (RA);    
* 25-Mar-2003 : Implemented Serializable (DG);    
* 01-May-2003 : Modified drawItem() method signature (DG);    
* 30-Jul-2003 : Modified entity constructor (CZ);    
* 20-Aug-2003 : Implemented Cloneable and PublicCloneable (DG);    
* 24-Aug-2003 : Added null checks in drawItem (BK);    
* 16-Sep-2003 : Changed ChartRenderingInfo --> PlotRenderingInfo (DG);    
* 07-Oct-2003 : Added renderer state (DG);    
* 05-Dec-2003 : Changed call to obtain outline paint (DG);    
* 10-Feb-2004 : Added state class, updated drawItem() method to make     
*               cut-and-paste overriding easier, and replaced property change     
*               with RendererChangeEvent (DG);    
* 25-Feb-2004 : Replaced CrosshairInfo with CrosshairState (DG);    
* 26-Apr-2004 : Added gradient paint transformer (DG);    
* 19-May-2004 : Fixed bug (879709) with bar zero value for secondary axis (DG);    
* 15-Jul-2004 : Switched getX() with getXValue() and getY() with     
*               getYValue() (DG);    
* 01-Sep-2004 : Added a flag to control whether or not the bar outlines are     
*               drawn (DG);    
* 03-Sep-2004 : Added option to use y-interval from dataset to determine the     
*               length of the bars (DG);    
* 08-Sep-2004 : Added equals() method and updated clone() method (DG);    
* 26-Jan-2005 : Added override for getLegendItem() method (DG);    
* 20-Apr-2005 : Use generators for label tooltips and URLs (DG);    
* 19-May-2005 : Added minimal item label implementation - needs improving (DG);    
* 14-Oct-2005 : Fixed rendering problem with inverted axes (DG);    
* ------------- JFREECHART 1.0.x ---------------------------------------------    
* 21-Jun-2006 : Improved item label handling - see bug 1501768 (DG);    
* 24-Aug-2006 : Added crosshair support (DG);    
* 13-Dec-2006 : Updated getLegendItems() to return gradient paint     
*               transformer (DG);    
* 02-Feb-2007 : Changed setUseYInterval() to only notify when the flag     
*               changes (DG);    
* 06-Feb-2007 : Fixed bug 1086307, crosshairs with multiple axes (DG);    
* 09-Feb-2007 : Updated getLegendItem() to observe drawBarOutline flag (DG);    
* 05-Mar-2007 : Applied patch 1671126 by Sergei Ivanov, to fix rendering with    
*               LogarithmicAxis (DG);    
* 20-Apr-2007 : Updated getLegendItem() for renderer change (DG);    
* 17-May-2007 : Set datasetIndex and seriesIndex in getLegendItem() (DG);    
* 18-May-2007 : Set dataset and seriesKey for LegendItem (DG);    
* 15-Jun-2007 : Changed default for drawBarOutline to false (DG);    
* 26-Sep-2007 : Fixed bug 1775452, problem with bar margins for inverted    
*               axes, thanks to Marc van Glabbeek (DG);    
* 12-Nov-2007 : Fixed NPE in drawItemLabel() method, thanks to Richard West    
*               (see patch 1827829) (DG);    
*    
*/

package edu.dlnu.liuwenpeng.render;

import java.awt.Color;
import java.awt.Font;
import java.awt.GradientPaint;
import java.awt.Graphics2D;
import java.awt.Paint;
import java.awt.Shape;
import java.awt.Stroke;
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 org.jfree.chart.LegendItem;
import org.jfree.chart.axis.ValueAxis;
import org.jfree.chart.entity.EntityCollection;
import org.jfree.chart.event.RendererChangeEvent;
import org.jfree.chart.labels.ItemLabelAnchor;
import org.jfree.chart.labels.ItemLabelPosition;
import org.jfree.chart.labels.XYItemLabelGenerator;
import org.jfree.chart.labels.XYSeriesLabelGenerator;
import org.jfree.chart.plot.CrosshairState;
import org.jfree.chart.plot.PlotOrientation;
import org.jfree.chart.plot.PlotRenderingInfo;
import org.jfree.chart.plot.XYPlot;
import org.jfree.chart.renderer.xy.AbstractXYItemRenderer;
import org.jfree.chart.renderer.xy.XYItemRenderer;
import org.jfree.chart.renderer.xy.XYItemRendererState;
import org.jfree.data.Range;
import org.jfree.data.general.DatasetUtilities;
import org.jfree.data.xy.IntervalXYDataset;
import org.jfree.data.xy.XYDataset;
import org.jfree.io.SerialUtilities;
import org.jfree.text.TextUtilities;
import org.jfree.ui.GradientPaintTransformer;
import org.jfree.ui.RectangleEdge;
import org.jfree.ui.StandardGradientPaintTransformer;
import org.jfree.util.ObjectUtilities;
import org.jfree.util.PublicCloneable;
import org.jfree.util.ShapeUtilities;

/**    
* A renderer that draws bars on an {@link XYPlot} (requires an     
* {@link IntervalXYDataset}).    
*/
public class NewXYBarRenderer extends AbstractXYItemRenderer
        implements XYItemRenderer, Cloneable, PublicCloneable, Serializable {

    /** For serialization. */
    private static final long serialVersionUID = 770559577251370036L;

    /**    
    * The state class used by this renderer.    
    */
    protected class XYBarRendererState extends XYItemRendererState {

        /** Base for bars against the range axis, in Java 2D space. */
        private double g2Base;

        /**    
        * Creates a new state object.    
        *     
        * @param info  the plot rendering info.    
        */
        public XYBarRendererState(PlotRenderingInfo info) {
            super(info);
        }

        /**    
        * Returns the base (range) value in Java 2D space.    
        *     
        * @return The base value.    
        */
        public double getG2Base() {
            return this.g2Base;
        }

        /**    
        * Sets the range axis base in Java2D space.    
        *     
        * @param value  the value.    
        */
        public void setG2Base(double value) {
            this.g2Base = value;
        }
    }

    /** The default base value for the bars. */
    private double base;

    /**     
    * A flag that controls whether the bars use the y-interval supplied by the     
    * dataset.     
    */
    private boolean useYInterval;

    /** Percentage margin (to reduce the width of bars). */
    private double margin;

    /** A flag that controls whether or not bar outlines are drawn. */
    private boolean drawBarOutline;

    /**     
    * An optional class used to transform gradient paint objects to fit each     
    * bar.     
    */
    private GradientPaintTransformer gradientPaintTransformer;

    /**     
    * The shape used to represent a bar in each legend item (this should never    
    * be <code>null</code>).     
    */
    private transient Shape legendBar;

    /**     
    * The fallback position if a positive item label doesn't fit inside the     
    * bar.     
    */
    private ItemLabelPosition positiveItemLabelPositionFallback;

    /**     
    * The fallback position if a negative item label doesn't fit inside the     
    * bar.     
    */
    private ItemLabelPosition negativeItemLabelPositionFallback;

    /**    
    * The default constructor.    
    */
    public NewXYBarRenderer() {
        this(0.0);
    }

    /**    
    * Constructs a new renderer.    
    *    
    * @param margin  the percentage amount to trim from the width of each bar.    
    */
    public NewXYBarRenderer(double margin) {
        super();
        this.margin = margin;
        this.base = 0.0;
        this.useYInterval = false;
        this.gradientPaintTransformer = new StandardGradientPaintTransformer();
        this.drawBarOutline = false;
        this.legendBar = new Rectangle2D.Double(-3.0, -5.0, 6.0, 10.0);
    }

    /**    
    * Returns the base value for the bars.    
    *     
    * @return The base value for the bars.    
    *     
    * @see #setBase(double)    
    */
    public double getBase() {
        return this.base;
    }

    /**    
    * Sets the base value for the bars and sends a {@link RendererChangeEvent}    
    * to all registered listeners.  The base value is not used if the dataset's    
    * y-interval is being used to determine the bar length.    
    *     
    * @param base  the new base value.    
    *     
    * @see #getBase()    
    * @see #getUseYInterval()    
    */
    public void setBase(double base) {
        this.base = base;
        fireChangeEvent();
    }

    /**    
    * Returns a flag that determines whether the y-interval from the dataset is    
    * used to calculate the length of each bar.    
    *     
    * @return A boolean.    
    *     
    * @see #setUseYInterval(boolean)    
    */
    public boolean getUseYInterval() {
        return this.useYInterval;
    }

    /**    
    * Sets the flag that determines whether the y-interval from the dataset is    
    * used to calculate the length of each bar, and sends a     
    * {@link RendererChangeEvent} to all registered listeners.    
    *     
    * @param use  the flag.    
    *     
    * @see #getUseYInterval()    
    */
    public void setUseYInterval(boolean use) {
        if (this.useYInterval != use) {
            this.useYInterval = use;
            fireChangeEvent();
        }
    }

    /**    
    * Returns the margin which is a percentage amount by which the bars are     
    * trimmed.    
    *    
    * @return The margin.    
    *     
    * @see #setMargin(double)    
    */
    public double getMargin() {
        return this.margin;
    }

    /**    
    * Sets the percentage amount by which the bars are trimmed and sends a     
    * {@link RendererChangeEvent} to all registered listeners.    
    *    
    * @param margin  the new margin.    
    *     
    * @see #getMargin()    
    */
    public void setMargin(double margin) {
        this.margin = margin;
        fireChangeEvent();
    }

    /**    
    * Returns a flag that controls whether or not bar outlines are drawn.    
    *     
    * @return A boolean.    
    *     
    * @see #setDrawBarOutline(boolean)    
    */
    public boolean isDrawBarOutline() {
        return this.drawBarOutline;
    }

    /**    
    * Sets the flag that controls whether or not bar outlines are drawn and     
    * sends a {@link RendererChangeEvent} to all registered listeners.    
    *     
    * @param draw  the flag.    
    *     
    * @see #isDrawBarOutline()    
    */
    public void setDrawBarOutline(boolean draw) {
        this.drawBarOutline = draw;
        fireChangeEvent();
    }

    /**    
    * Returns the gradient paint transformer (an object used to transform     
    * gradient paint objects to fit each bar).    
    *     
    * @return A transformer (<code>null</code> possible).    
    *     
    * @see #setGradientPaintTransformer(GradientPaintTransformer)    
    */
    public GradientPaintTransformer getGradientPaintTransformer() {
        return this.gradientPaintTransformer;
    }

    /**    
    * Sets the gradient paint transformer and sends a     
    * {@link RendererChangeEvent} to all registered listeners.    
    *     
    * @param transformer  the transformer (<code>null</code> permitted).    
    *     
    * @see #getGradientPaintTransformer()    
    */
    public void setGradientPaintTransformer(GradientPaintTransformer transformer) {
        this.gradientPaintTransformer = transformer;
        fireChangeEvent();
    }

    /**    
    * Returns the shape used to represent bars in each legend item.    
    *     
    * @return The shape used to represent bars in each legend item (never     
    *         <code>null</code>).    
    *             
    * @see #setLegendBar(Shape)    
    */
    public Shape getLegendBar() {
        return this.legendBar;
    }

    /**    
    * Sets the shape used to represent bars in each legend item and sends a    
    * {@link RendererChangeEvent} to all registered listeners.    
    *     
    * @param bar  the bar shape (<code>null</code> not permitted).    
    *     
    * @see #getLegendBar()    
    */
    public void setLegendBar(Shape bar) {
        if (bar == null) {
            throw new IllegalArgumentException("Null 'bar' argument.");
        }
        this.legendBar = bar;
        fireChangeEvent();
    }

    /**    
    * Returns the fallback position for positive item labels that don't fit     
    * within a bar.    
    *     
    * @return The fallback position (<code>null</code> possible).    
    *     
    * @see #setPositiveItemLabelPositionFallback(ItemLabelPosition)    
    * @since 1.0.2    
    */
    public ItemLabelPosition getPositiveItemLabelPositionFallback() {
        return this.positiveItemLabelPositionFallback;
    }

    /**    
    * Sets the fallback position for positive item labels that don't fit     
    * within a bar, and sends a {@link RendererChangeEvent} to all registered    
    * listeners.    
    *     
    * @param position  the position (<code>null</code> permitted).    
    *     
    * @see #getPositiveItemLabelPositionFallback()    
    * @since 1.0.2    
    */
    public void setPositiveItemLabelPositionFallback(ItemLabelPosition position) {
        this.positiveItemLabelPositionFallback = position;
        fireChangeEvent();
    }

    /**    
    * Returns the fallback position for negative item labels that don't fit     
    * within a bar.    
    *     
    * @return The fallback position (<code>null</code> possible).    
    *     
    * @see #setNegativeItemLabelPositionFallback(ItemLabelPosition)    
    * @since 1.0.2    
    */
    public ItemLabelPosition getNegativeItemLabelPositionFallback() {
        return this.negativeItemLabelPositionFallback;
    }

    /**    
    * Sets the fallback position for negative item labels that don't fit     
    * within a bar, and sends a {@link RendererChangeEvent} to all registered    
    * listeners.    
    *     
    * @param position  the position (<code>null</code> permitted).    
    *     
    * @see #getNegativeItemLabelPositionFallback()    
    * @since 1.0.2    
    */
    public void setNegativeItemLabelPositionFallback(ItemLabelPosition position) {
        this.negativeItemLabelPositionFallback = position;
        fireChangeEvent();
    }

    /**    
    * Initialises the renderer and returns a state object that should be     
    * passed to all subsequent calls to the drawItem() method.  Here we     
    * calculate the Java2D y-coordinate for zero, since all the bars have     
    * their bases fixed at zero.    
    *    
    * @param g2  the graphics device.    
    * @param dataArea  the area inside the axes.    
    * @param plot  the plot.    
    * @param dataset  the data.    
    * @param info  an optional info collection object to return data back to     
    *              the caller.    
    *    
    * @return A state object.    
    */
    public XYItemRendererState initialise(Graphics2D g2, Rectangle2D dataArea, XYPlot plot, XYDataset dataset,
            PlotRenderingInfo info) {

        XYBarRendererState state = new XYBarRendererState(info);
        ValueAxis rangeAxis = plot.getRangeAxisForDataset(plot.indexOf(dataset));
        state.setG2Base(rangeAxis.valueToJava2D(this.base, dataArea, plot.getRangeAxisEdge()));
        return state;

    }

    /**    
    * Returns a default legend item for the specified series.  Subclasses     
    * should override this method to generate customised items.    
    *    
    * @param datasetIndex  the dataset index (zero-based).    
    * @param series  the series index (zero-based).    
    *    
    * @return A legend item for the series.    
    */
    public LegendItem getLegendItem(int datasetIndex, int series) {
        LegendItem result = null;
        XYPlot xyplot = getPlot();
        if (xyplot != null) {
            XYDataset dataset = xyplot.getDataset(datasetIndex);
            if (dataset != null) {
                XYSeriesLabelGenerator lg = getLegendItemLabelGenerator();
                String label = lg.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 = this.legendBar;
                Paint paint = lookupSeriesPaint(series);
                Paint outlinePaint = lookupSeriesOutlinePaint(series);
                Stroke outlineStroke = lookupSeriesOutlineStroke(series);
                if (this.drawBarOutline) {
                    result = new LegendItem(label, description, toolTipText, urlText, shape, paint, outlineStroke,
                            outlinePaint);
                } else {
                    result = new LegendItem(label, description, toolTipText, urlText, shape, paint);
                }
                result.setDataset(dataset);
                result.setDatasetIndex(datasetIndex);
                result.setSeriesKey(dataset.getSeriesKey(series));
                result.setSeriesIndex(series);
                if (getGradientPaintTransformer() != null) {
                    result.setFillPaintTransformer(getGradientPaintTransformer());
                }
            }
        }
        return result;
    }

    /**    
    * Draws the visual representation of a single data item.    
    *    
    * @param g2  the graphics device.    
    * @param state  the renderer state.    
    * @param dataArea  the area within which the plot is being drawn.    
    * @param info  collects information about the drawing.    
    * @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.    
    * @param series  the series index (zero-based).    
    * @param item  the item index (zero-based).    
    * @param crosshairState  crosshair information for the plot     
    *                        (<code>null</code> permitted).    
    * @param pass  the pass index.    
    */
    public void drawItem(Graphics2D g2, XYItemRendererState state, Rectangle2D dataArea, PlotRenderingInfo info,
            XYPlot plot, ValueAxis domainAxis, ValueAxis rangeAxis, XYDataset dataset, int series, int item,
            CrosshairState crosshairState, int pass) {

        if (!getItemVisible(series, item)) {
            return;
        }
        IntervalXYDataset intervalDataset = (IntervalXYDataset) dataset;

        double value0;
        double value1;
        if (this.useYInterval) {
            value0 = intervalDataset.getStartYValue(series, item);
            value1 = intervalDataset.getEndYValue(series, item);
        } else {
            value0 = this.base;
            value1 = intervalDataset.getYValue(series, item);
        }
        if (Double.isNaN(value0) || Double.isNaN(value1)) {
            return;
        }
        if (value0 <= value1) {
            if (!rangeAxis.getRange().intersects(value0, value1)) {
                return;
            }
        } else {
            if (!rangeAxis.getRange().intersects(value1, value0)) {
                return;
            }
        }

        double translatedValue0 = rangeAxis.valueToJava2D(value0, dataArea, plot.getRangeAxisEdge());
        double translatedValue1 = rangeAxis.valueToJava2D(value1, dataArea, plot.getRangeAxisEdge());
        double bottom = Math.min(translatedValue0, translatedValue1);
        double top = Math.max(translatedValue0, translatedValue1);

        double startX = intervalDataset.getStartXValue(series, item);
        if (Double.isNaN(startX)) {
            return;
        }
        double endX = intervalDataset.getEndXValue(series, item);
        if (Double.isNaN(endX)) {
            return;
        }
        if (startX <= endX) {
            if (!domainAxis.getRange().intersects(startX, endX)) {
                return;
            }
        } else {
            if (!domainAxis.getRange().intersects(endX, startX)) {
                return;
            }
        }

        RectangleEdge location = plot.getDomainAxisEdge();
        double translatedStartX = domainAxis.valueToJava2D(startX, dataArea, location);
        double translatedEndX = domainAxis.valueToJava2D(endX, dataArea, location);

        double translatedWidth = Math.max(1, Math.abs(translatedEndX - translatedStartX));

        double left = Math.min(translatedStartX, translatedEndX);
        if (getMargin() > 0.0) {
            double cut = translatedWidth * getMargin();
            translatedWidth = translatedWidth - cut;
            left = left + cut / 2;
        }

        Rectangle2D bar = null;
        PlotOrientation orientation = plot.getOrientation();
        if (orientation == PlotOrientation.HORIZONTAL) {
            // clip left and right bounds to data area    
            bottom = Math.max(bottom, dataArea.getMinX());
            top = Math.min(top, dataArea.getMaxX());
            bar = new Rectangle2D.Double(bottom, left, top - bottom, translatedWidth);
        } else if (orientation == PlotOrientation.VERTICAL) {
            // clip top and bottom bounds to data area    
            bottom = Math.max(bottom, dataArea.getMinY());
            top = Math.min(top, dataArea.getMaxY());
            bar = new Rectangle2D.Double(left, bottom, translatedWidth, top - bottom);
        }

        /* Paint itemPaint = getItemPaint(series, item);    
         if (getGradientPaintTransformer()     
               != null && itemPaint instanceof GradientPaint) {    
           GradientPaint gp = (GradientPaint) itemPaint;    
           itemPaint = getGradientPaintTransformer().transform(gp, bar);    
         }    
             
        g2.setPaint(itemPaint);  
        */
        if (dataset.getYValue(series, item) >= 0) {
            g2.setPaint(Color.red);
        } else {
            g2.setPaint(Color.green);
        }
        g2.fill(bar);
        if (isDrawBarOutline() && Math.abs(translatedEndX - translatedStartX) > 3) {
            Stroke stroke = getItemOutlineStroke(series, item);
            Paint paint = getItemOutlinePaint(series, item);

            if (stroke != null && paint != null) {
                g2.setStroke(stroke);
                g2.setPaint(paint);
                g2.draw(bar);
            }
        }

        if (isItemLabelVisible(series, item)) {
            XYItemLabelGenerator generator = getItemLabelGenerator(series, item);
            drawItemLabel(g2, dataset, series, item, plot, generator, bar, value1 < 0.0);
        }

        // update the crosshair point    
        double x1 = (startX + endX) / 2.0;
        double y1 = dataset.getYValue(series, item);
        double transX1 = domainAxis.valueToJava2D(x1, dataArea, location);
        double transY1 = rangeAxis.valueToJava2D(y1, dataArea, plot.getRangeAxisEdge());
        int domainAxisIndex = plot.getDomainAxisIndex(domainAxis);
        int rangeAxisIndex = plot.getRangeAxisIndex(rangeAxis);
        updateCrosshairValues(crosshairState, x1, y1, domainAxisIndex, rangeAxisIndex, transX1, transY1,
                plot.getOrientation());

        EntityCollection entities = state.getEntityCollection();
        if (entities != null) {
            addEntity(entities, bar, dataset, series, item, 0.0, 0.0);
        }

    }

    /**    
    * Draws an item label.  This method is provided as an alternative to    
    * {@link #drawItemLabel(Graphics2D, PlotOrientation, XYDataset, int, int,     
    * double, double, boolean)} so that the bar can be used to calculate the     
    * label anchor point.     
    *     
    * @param g2  the graphics device.    
    * @param dataset  the dataset.    
    * @param series  the series index.    
    * @param item  the item index.    
    * @param plot  the plot.    
    * @param generator  the label generator (<code>null</code> permitted, in     
    *         which case the method does nothing, just returns).    
    * @param bar  the bar.    
    * @param negative  a flag indicating a negative value.    
    */
    protected void drawItemLabel(Graphics2D g2, XYDataset dataset, int series, int item, XYPlot plot,
            XYItemLabelGenerator generator, Rectangle2D bar, boolean negative) {

        if (generator == null) {
            return; // nothing to do    
        }
        String label = generator.generateLabel(dataset, series, item);
        if (label == null) {
            return; // nothing to do       
        }

        Font labelFont = getItemLabelFont(series, item);
        g2.setFont(labelFont);
        Paint paint = getItemLabelPaint(series, item);
        g2.setPaint(paint);

        // find out where to place the label...    
        ItemLabelPosition position = null;
        if (!negative) {
            position = getPositiveItemLabelPosition(series, item);
        } else {
            position = getNegativeItemLabelPosition(series, item);
        }

        // work out the label anchor point...    
        Point2D anchorPoint = calculateLabelAnchorPoint(position.getItemLabelAnchor(), bar, plot.getOrientation());

        if (isInternalAnchor(position.getItemLabelAnchor())) {
            Shape bounds = TextUtilities.calculateRotatedStringBounds(label, g2, (float) anchorPoint.getX(),
                    (float) anchorPoint.getY(), position.getTextAnchor(), position.getAngle(),
                    position.getRotationAnchor());

            if (bounds != null) {
                if (!bar.contains(bounds.getBounds2D())) {
                    if (!negative) {
                        position = getPositiveItemLabelPositionFallback();
                    } else {
                        position = getNegativeItemLabelPositionFallback();
                    }
                    if (position != null) {
                        anchorPoint = calculateLabelAnchorPoint(position.getItemLabelAnchor(), bar,
                                plot.getOrientation());
                    }
                }
            }

        }

        if (position != null) {
            TextUtilities.drawRotatedString(label, g2, (float) anchorPoint.getX(), (float) anchorPoint.getY(),
                    position.getTextAnchor(), position.getAngle(), position.getRotationAnchor());
        }
    }

    /**    
    * Calculates the item label anchor point.    
    *    
    * @param anchor  the anchor.    
    * @param bar  the bar.    
    * @param orientation  the plot orientation.    
    *    
    * @return The anchor point.    
    */
    private Point2D calculateLabelAnchorPoint(ItemLabelAnchor anchor, Rectangle2D bar,
            PlotOrientation orientation) {

        Point2D result = null;
        double offset = getItemLabelAnchorOffset();
        double x0 = bar.getX() - offset;
        double x1 = bar.getX();
        double x2 = bar.getX() + offset;
        double x3 = bar.getCenterX();
        double x4 = bar.getMaxX() - offset;
        double x5 = bar.getMaxX();
        double x6 = bar.getMaxX() + offset;

        double y0 = bar.getMaxY() + offset;
        double y1 = bar.getMaxY();
        double y2 = bar.getMaxY() - offset;
        double y3 = bar.getCenterY();
        double y4 = bar.getMinY() + offset;
        double y5 = bar.getMinY();
        double y6 = bar.getMinY() - offset;

        if (anchor == ItemLabelAnchor.CENTER) {
            result = new Point2D.Double(x3, y3);
        } else if (anchor == ItemLabelAnchor.INSIDE1) {
            result = new Point2D.Double(x4, y4);
        } else if (anchor == ItemLabelAnchor.INSIDE2) {
            result = new Point2D.Double(x4, y4);
        } else if (anchor == ItemLabelAnchor.INSIDE3) {
            result = new Point2D.Double(x4, y3);
        } else if (anchor == ItemLabelAnchor.INSIDE4) {
            result = new Point2D.Double(x4, y2);
        } else if (anchor == ItemLabelAnchor.INSIDE5) {
            result = new Point2D.Double(x4, y2);
        } else if (anchor == ItemLabelAnchor.INSIDE6) {
            result = new Point2D.Double(x3, y2);
        } else if (anchor == ItemLabelAnchor.INSIDE7) {
            result = new Point2D.Double(x2, y2);
        } else if (anchor == ItemLabelAnchor.INSIDE8) {
            result = new Point2D.Double(x2, y2);
        } else if (anchor == ItemLabelAnchor.INSIDE9) {
            result = new Point2D.Double(x2, y3);
        } else if (anchor == ItemLabelAnchor.INSIDE10) {
            result = new Point2D.Double(x2, y4);
        } else if (anchor == ItemLabelAnchor.INSIDE11) {
            result = new Point2D.Double(x2, y4);
        } else if (anchor == ItemLabelAnchor.INSIDE12) {
            result = new Point2D.Double(x3, y4);
        } else if (anchor == ItemLabelAnchor.OUTSIDE1) {
            result = new Point2D.Double(x5, y6);
        } else if (anchor == ItemLabelAnchor.OUTSIDE2) {
            result = new Point2D.Double(x6, y5);
        } else if (anchor == ItemLabelAnchor.OUTSIDE3) {
            result = new Point2D.Double(x6, y3);
        } else if (anchor == ItemLabelAnchor.OUTSIDE4) {
            result = new Point2D.Double(x6, y1);
        } else if (anchor == ItemLabelAnchor.OUTSIDE5) {
            result = new Point2D.Double(x5, y0);
        } else if (anchor == ItemLabelAnchor.OUTSIDE6) {
            result = new Point2D.Double(x3, y0);
        } else if (anchor == ItemLabelAnchor.OUTSIDE7) {
            result = new Point2D.Double(x1, y0);
        } else if (anchor == ItemLabelAnchor.OUTSIDE8) {
            result = new Point2D.Double(x0, y1);
        } else if (anchor == ItemLabelAnchor.OUTSIDE9) {
            result = new Point2D.Double(x0, y3);
        } else if (anchor == ItemLabelAnchor.OUTSIDE10) {
            result = new Point2D.Double(x0, y5);
        } else if (anchor == ItemLabelAnchor.OUTSIDE11) {
            result = new Point2D.Double(x1, y6);
        } else if (anchor == ItemLabelAnchor.OUTSIDE12) {
            result = new Point2D.Double(x3, y6);
        }

        return result;

    }

    /**    
    * Returns <code>true</code> if the specified anchor point is inside a bar.    
    *     
    * @param anchor  the anchor point.    
    *     
    * @return A boolean.    
    */
    private boolean isInternalAnchor(ItemLabelAnchor anchor) {
        return anchor == ItemLabelAnchor.CENTER || anchor == ItemLabelAnchor.INSIDE1
                || anchor == ItemLabelAnchor.INSIDE2 || anchor == ItemLabelAnchor.INSIDE3
                || anchor == ItemLabelAnchor.INSIDE4 || anchor == ItemLabelAnchor.INSIDE5
                || anchor == ItemLabelAnchor.INSIDE6 || anchor == ItemLabelAnchor.INSIDE7
                || anchor == ItemLabelAnchor.INSIDE8 || anchor == ItemLabelAnchor.INSIDE9
                || anchor == ItemLabelAnchor.INSIDE10 || anchor == ItemLabelAnchor.INSIDE11
                || anchor == ItemLabelAnchor.INSIDE12;
    }

    /**    
    * Returns the lower and upper bounds (range) of the x-values in the     
    * specified dataset.  Since this renderer uses the x-interval in the     
    * dataset, this is taken into account for the range.    
    *     
    * @param dataset  the dataset (<code>null</code> permitted).    
    *     
    * @return The range (<code>null</code> if the dataset is     
    *         <code>null</code> or empty).    
    */
    public Range findDomainBounds(XYDataset dataset) {
        if (dataset != null) {
            return DatasetUtilities.findDomainBounds(dataset, true);
        } else {
            return null;
        }
    }

    /**    
    * Returns a clone of the renderer.    
    *    
    * @return A clone.    
    *    
    * @throws CloneNotSupportedException  if the renderer cannot be cloned.    
    */
    public Object clone() throws CloneNotSupportedException {
        NewXYBarRenderer result = (NewXYBarRenderer) super.clone();
        if (this.gradientPaintTransformer != null) {
            result.gradientPaintTransformer = (GradientPaintTransformer) ObjectUtilities
                    .clone(this.gradientPaintTransformer);
        }
        result.legendBar = ShapeUtilities.clone(this.legendBar);
        return result;
    }

    /**    
    * Tests this renderer for equality with an arbitrary object.    
    *     
    * @param obj  the object to test against (<code>null</code> permitted).    
    *     
    * @return A boolean.    
    */
    public boolean equals(Object obj) {
        if (obj == this) {
            return true;
        }
        if (!(obj instanceof NewXYBarRenderer)) {
            return false;
        }
        if (!super.equals(obj)) {
            return false;
        }
        NewXYBarRenderer that = (NewXYBarRenderer) obj;
        if (this.base != that.base) {
            return false;
        }
        if (this.drawBarOutline != that.drawBarOutline) {
            return false;
        }
        if (this.margin != that.margin) {
            return false;
        }
        if (this.useYInterval != that.useYInterval) {
            return false;
        }
        if (!ObjectUtilities.equal(this.gradientPaintTransformer, that.gradientPaintTransformer)) {
            return false;
        }
        if (!ShapeUtilities.equal(this.legendBar, that.legendBar)) {
            return false;
        }
        if (!ObjectUtilities.equal(this.positiveItemLabelPositionFallback,
                that.positiveItemLabelPositionFallback)) {
            return false;
        }
        if (!ObjectUtilities.equal(this.negativeItemLabelPositionFallback,
                that.negativeItemLabelPositionFallback)) {
            return false;
        }
        return true;
    }

    /**    
    * 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.legendBar = SerialUtilities.readShape(stream);
    }

    /**    
     * 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.writeShape(this.legendBar, stream);
    }

}