/* ===========================================================
 * JFreeChart : a free chart library for the Java(tm) platform
 * ===========================================================
 *
 * (C) Copyright 2000-2005, 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
 *
 * [Java is a trademark or registered trademark of Sun Microsystems, Inc. 
 * in the United States and other countries.]
 *
 * -------------------------
 * CategoryItemRenderer.java
 * -------------------------
 *
 * (C) Copyright 2001-2005, by Object Refinery Limited and Contributors.
 *
 * Original Author:  David Gilbert (for Object Refinery Limited);
 * Contributor(s):   Mark Watson (www.markwatson.com);
 *
 * $Id: CategoryItemRenderer.java,v 1.6 2005/02/23 13:02:05 mungady Exp $
 *
 * Changes
 * -------
 * 23-Oct-2001 : Version 1 (DG);
 * 16-Jan-2002 : Renamed HorizontalCategoryItemRenderer.java 
 *               --> CategoryItemRenderer.java (DG);
 * 05-Feb-2002 : Changed return type of the drawCategoryItem method from void 
 *               to Shape, as part of the tooltips implementation (DG)        
 *
 *               NOTE (30-May-2002) : this has subsequently been changed back 
 *               to void, tooltips are now collected along with entities in 
 *               ChartRenderingInfo (DG);
 *
 * 14-Mar-2002 : Added the initialise method, and changed all bar plots to use 
 *               this renderer (DG);
 * 23-May-2002 : Added ChartRenderingInfo to the initialise method (DG);
 * 29-May-2002 : Added the getAxisArea(Rectangle2D) method (DG);
 * 06-Jun-2002 : Updated Javadoc comments (DG);
 * 26-Jun-2002 : Added range axis to the initialise method (DG);
 * 24-Sep-2002 : Added getLegendItem() method (DG);
 * 23-Oct-2002 : Added methods to get/setToolTipGenerator (DG);
 * 05-Nov-2002 : Replaced references to CategoryDataset with TableDataset (DG);
 * 06-Nov-2002 : Added the domain axis to the drawCategoryItem method.  Renamed
 *               drawCategoryItem() --> drawItem() (DG);
 * 20-Nov-2002 : Changed signature of drawItem() method to reflect use of 
 *               TableDataset (DG);
 * 26-Nov-2002 : Replaced the isStacked() method with the getRangeType() 
 *               method (DG);
 * 08-Jan-2003 : Changed getSeriesCount() --> getRowCount() and
 *               getCategoryCount() --> getColumnCount() (DG);
 * 09-Jan-2003 : Changed name of grid-line methods (DG);
 * 21-Jan-2003 : Merged TableDataset with CategoryDataset (DG);
 * 10-Apr-2003 : Changed CategoryDataset to KeyedValues2DDataset in 
 *               drawItem() method (DG);
 * 29-Apr-2003 : Eliminated Renderer interface (DG);
 * 02-Sep-2003 : Fix for bug 790407 (DG);
 * 16-Sep-2003 : Changed ChartRenderingInfo --> PlotRenderingInfo (DG);
 * 20-Oct-2003 : Added setOutlinePaint() method (DG);
 * 06-Feb-2004 : Added missing methods, and moved deprecated methods (DG);
 * 19-Feb-2004 : Added extra setXXXLabelsVisible() methods (DG);
 * 29-Apr-2004 : Changed Integer --> int in initialise() method (DG);
 * 18-May-2004 : Added methods for item label paint (DG);
 * 05-Nov-2004 : Added getPassCount() method and 'pass' parameter to drawItem() 
 *               method (DG);
 * 07-Jan-2005 : Renamed getRangeExtent() --> findRangeBounds (DG);
 * 11-Jan-2005 : Removed deprecated code in preparation for 1.0.0 release (DG);
 * 23-Feb-2005 : Now extends LegendItemSource (DG);
 * 
 */

package org.jfree.chart.renderer.category;

import java.awt.Font;
import java.awt.Graphics2D;
import java.awt.Paint;
import java.awt.Shape;
import java.awt.Stroke;
import java.awt.geom.Rectangle2D;

import org.jfree.chart.LegendItem;
import org.jfree.chart.LegendItemSource;
import org.jfree.chart.axis.CategoryAxis;
import org.jfree.chart.axis.ValueAxis;
import org.jfree.chart.event.RendererChangeEvent;
import org.jfree.chart.event.RendererChangeListener;
import org.jfree.chart.labels.CategoryLabelGenerator;
import org.jfree.chart.labels.CategoryToolTipGenerator;
import org.jfree.chart.labels.ItemLabelPosition;
import org.jfree.chart.plot.CategoryPlot;
import org.jfree.chart.plot.Marker;
import org.jfree.chart.plot.PlotRenderingInfo;
import org.jfree.chart.urls.CategoryURLGenerator;
import org.jfree.data.Range;
import org.jfree.data.category.CategoryDataset;

/**
 * A plug-in object that is used by the {@link CategoryPlot} class to display 
 * individual data items from a {@link CategoryDataset}.
 * <p>
 * This interface defines the methods that must be provided by all renderers.  
 * If you are implementing a custom renderer, you should consider extending the
 * {@link AbstractCategoryItemRenderer} class.
 * <p>
 * Most renderer attributes are defined using a "three layer" approach.  When 
 * looking up an attribute (for example, the outline paint) the renderer first 
 * checks to see if there is a setting (in layer 0) that applies to ALL items 
 * that the renderer draws.  If there is, that setting is used, but if it is 
 * <code>null</code> the renderer looks up the next layer, which contains 
 * "per series" settings for the attribute (many attributes are defined on a
 * per series basis, so this is the layer that is most commonly used).  If the 
 * layer 1 setting is <code>null</code>, the renderer will look up the final 
 * layer, which provides a default or "base" setting.  Some attributes allow 
 * the base setting to be <code>null</code>, while other attributes enforce 
 * non-<code>null</code> values.
 */

public interface CategoryItemRenderer extends LegendItemSource {

    /**
     * Returns the number of passes through the dataset required by the 
     * renderer.  Usually this will be one, but some renderers may use
     * a second or third pass to overlay items on top of things that were
     * drawn in an earlier pass.
     * 
     * @return The pass count.
     */
    public int getPassCount();

    /**
     * Returns the plot that the renderer has been assigned to (where 
     * <code>null</code> indicates that the renderer is not currently assigned 
     * to a plot).
     *
     * @return The plot (possibly <code>null</code>).
     */
    public CategoryPlot getPlot();

    /**
     * Sets the plot that the renderer has been assigned to.  This method is 
     * usually called by the {@link CategoryPlot}, in normal usage you 
     * shouldn't need to call this method directly.
     *
     * @param plot  the plot (<code>null</code> not permitted).
     */
    public void setPlot(CategoryPlot plot);

    /**
     * Adds a change listener.
     * 
     * @param listener  the listener.
     */
    public void addChangeListener(RendererChangeListener listener);
    
    /**
     * Removes a change listener.
     * 
     * @param listener  the listener.
     */
    public void removeChangeListener(RendererChangeListener listener);

    /**
     * Returns the range of values the renderer requires to display all the 
     * items from the specified dataset.
     * 
     * @param dataset  the dataset (<code>null</code> permitted).
     * 
     * @return The range (or <code>null</code> if the dataset is 
     *         <code>null</code> or empty).
     */
    public Range findRangeBounds(CategoryDataset dataset);
    
    /**
     * Initialises the renderer.  This method will be called before the first 
     * item is rendered, giving the renderer an opportunity to initialise any 
     * state information it wants to maintain. The renderer can do nothing if 
     * it chooses.
     *
     * @param g2  the graphics device.
     * @param dataArea  the area inside the axes.
     * @param plot  the plot.
     * @param rendererIndex  the renderer index.
     * @param info  collects chart rendering information for return to caller.
     * 
     * @return A state object (maintains state information relevant to one 
     *         chart drawing).
     */
    public CategoryItemRendererState initialise(Graphics2D g2,
                                                Rectangle2D dataArea,
                                                CategoryPlot plot,
                                                int rendererIndex,
                                                PlotRenderingInfo info);
                           
    //// PAINT /////////////////////////////////////////////////////////////////
    
    /**
     * Returns the paint used to fill data items as they are drawn.
     *
     * @param row  the row (or series) index (zero-based).
     * @param column  the column (or category) index (zero-based).
     *
     * @return the paint (never <code>null</code>).
     */
    public Paint getItemPaint(int row, int column);

    /**
     * Sets the paint to be used for ALL series, and sends a 
     * {@link RendererChangeEvent} to all registered listeners.  If this is 
     * <code>null</code>, the renderer will use the paint for the series.
     * 
     * @param paint  the paint (<code>null</code> permitted).
     */
    public void setPaint(Paint paint);
    
    /**
     * Returns the paint used to fill an item drawn by the renderer.
     *
     * @param series  the series index (zero-based).
     *
     * @return the paint (never <code>null</code>).
     */
    public Paint getSeriesPaint(int series);

    /**
     * Sets the paint used for a series and sends a {@link RendererChangeEvent}
     * to all registered listeners.
     *
     * @param series  the series index (zero-based).
     * @param paint  the paint (<code>null</code> permitted).
     */
    public void setSeriesPaint(int series, Paint paint);
    
    /**
     * Returns the base paint.
     *
     * @return the base paint (never <code>null</code>).
     */
    public Paint getBasePaint();

    /**
     * Sets the base paint and sends a {@link RendererChangeEvent} to all 
     * registered listeners.
     *
     * @param paint  the paint (<code>null</code> not permitted).
     */
    public void setBasePaint(Paint paint);
    
    //// OUTLINE PAINT /////////////////////////////////////////////////////////
    
    /**
     * Returns the paint used to outline data items as they are drawn.
     *
     * @param row  the row (or series) index (zero-based).
     * @param column  the column (or category) index (zero-based).
     *
     * @return the paint (never <code>null</code>).
     */
    public Paint getItemOutlinePaint(int row, int column);

    /**
     * Sets the outline paint for ALL series (optional).
     * 
     * @param paint  the paint (<code>null</code> permitted).
     */
    public void setOutlinePaint(Paint paint);
    
    /**
     * Returns the paint used to outline an item drawn by the renderer.
     *
     * @param series  the series (zero-based index).
     *
     * @return the paint (never <code>null</code>).
     */
    public Paint getSeriesOutlinePaint(int series);

    /**
     * Sets the paint used for a series outline and sends a 
     * {@link RendererChangeEvent} to all registered listeners.
     *
     * @param series  the series index (zero-based).
     * @param paint  the paint (<code>null</code> permitted).
     */
    public void setSeriesOutlinePaint(int series, Paint paint);

    /**
     * Returns the base outline paint.
     *
     * @return the paint (never <code>null</code>).
     */
    public Paint getBaseOutlinePaint();

    /**
     * Sets the base outline paint and sends a {@link RendererChangeEvent} to 
     * all registered listeners.
     *
     * @param paint  the paint (<code>null</code> not permitted).
     */
    public void setBaseOutlinePaint(Paint paint);

    //// STROKE ////////////////////////////////////////////////////////////////
    
    /**
     * Returns the stroke used to draw data items.
     *
     * @param row  the row (or series) index (zero-based).
     * @param column  the column (or category) index (zero-based).
     *
     * @return the stroke (never <code>null</code>).
     */
    public Stroke getItemStroke(int row, int column);

    /**
     * Sets the stroke for ALL series and sends a {@link RendererChangeEvent} 
     * to all registered listeners.
     * 
     * @param stroke  the stroke (<code>null</code> permitted).
     */
    public void setStroke(Stroke stroke);

    /**
     * Returns the stroke used to draw the items in a series.
     *
     * @param series  the series (zero-based index).
     *
     * @return the stroke (never <code>null</code>).
     */
    public Stroke getSeriesStroke(int series);
    
    /**
     * Sets the stroke used for a series and sends a 
     * {@link RendererChangeEvent} to all registered listeners.
     *
     * @param series  the series index (zero-based).
     * @param stroke  the stroke (<code>null</code> permitted).
     */
    public void setSeriesStroke(int series, Stroke stroke);

    /**
     * Returns the base stroke.
     *
     * @return the base stroke (never <code>null</code>).
     */
    public Stroke getBaseStroke();

    /**
     * Sets the base stroke.
     *
     * @param stroke  the stroke (<code>null</code> not permitted).
     */
    public void setBaseStroke(Stroke stroke);
    
    //// OUTLINE STROKE ////////////////////////////////////////////////////////
    
    /**
     * Returns the stroke used to outline data items.
     * <p>
     * The default implementation passes control to the getSeriesOutlineStroke 
     * method.  You can override this method if you require different behaviour.
     *
     * @param row  the row (or series) index (zero-based).
     * @param column  the column (or category) index (zero-based).
     *
     * @return the stroke (never <code>null</code>).
     */
    public Stroke getItemOutlineStroke(int row, int column);

    /**
     * Sets the outline stroke for ALL series and sends a 
     * {@link RendererChangeEvent} to all registered listeners.
     *
     * @param stroke  the stroke (<code>null</code> permitted).
     */
    public void setOutlineStroke(Stroke stroke);
    
    /**
     * Returns the stroke used to outline the items in a series.
     *
     * @param series  the series (zero-based index).
     *
     * @return the stroke (never <code>null</code>).
     */
    public Stroke getSeriesOutlineStroke(int series);

    /**
     * Sets the outline stroke used for a series and sends a 
     * {@link RendererChangeEvent} to all registered listeners.
     *
     * @param series  the series index (zero-based).
     * @param stroke  the stroke (<code>null</code> permitted).
     */
    public void setSeriesOutlineStroke(int series, Stroke stroke);
    
    /**
     * Returns the base outline stroke.
     *
     * @return the stroke (never <code>null</code>).
     */
    public Stroke getBaseOutlineStroke();

    /**
     * Sets the base outline stroke and sends a {@link RendererChangeEvent} to 
     * all registered listeners.
     *
     * @param stroke  the stroke (<code>null</code> not permitted).
     */
    public void setBaseOutlineStroke(Stroke stroke);
    
    //// SHAPE /////////////////////////////////////////////////////////////////
    
    /**
     * Returns a shape used to represent a data item.
     *
     * @param row  the row (or series) index (zero-based).
     * @param column  the column (or category) index (zero-based).
     *
     * @return the shape (never <code>null</code>).
     */
    public Shape getItemShape(int row, int column);

    /**
     * Sets the shape for ALL series (optional) and sends a 
     * {@link RendererChangeEvent} to all registered listeners.
     * 
     * @param shape  the shape (<code>null</code> permitted).
     */
    public void setShape(Shape shape);
    
    /**
     * Returns a shape used to represent the items in a series.
     *
     * @param series  the series (zero-based index).
     *
     * @return the shape (never <code>null</code>).
     */
    public Shape getSeriesShape(int series);

    /**
     * Sets the shape used for a series and sends a {@link RendererChangeEvent}
     * to all registered listeners.
     *
     * @param series  the series index (zero-based).
     * @param shape  the shape (<code>null</code> permitted).
     */
    public void setSeriesShape(int series, Shape shape);
    
    /**
     * Returns the base shape.
     *
     * @return the shape (never <code>null</code>).
     */
    public Shape getBaseShape();

    /**
     * Sets the base shape and sends a {@link RendererChangeEvent} to all 
     * registered listeners.
     *
     * @param shape  the shape (<code>null</code> not permitted).
     */
    public void setBaseShape(Shape shape);
    
    // ITEM LABELS VISIBLE 
    
    /**
     * Returns <code>true</code> if an item label is visible, and 
     * <code>false</code> otherwise.
     * 
     * @param row  the row index (zero-based).
     * @param column  the column index (zero-based).
     * 
     * @return a boolean.
     */
    public boolean isItemLabelVisible(int row, int column);
    
    /**
     * Returns <code>true</code> if the item labels for a series are visible, 
     * and <code>false</code> otherwise.
     * 
     * @param series  the series index (zero-based).
     * 
     * @return a boolean.
     */    
    public boolean isSeriesItemLabelsVisible(int series);
    
    /**
     * Sets a flag that controls whether or not the item labels for ALL series 
     * are visible.
     * 
     * @param visible  the flag.
     */
    public void setItemLabelsVisible(boolean visible);

    /**
     * Sets a flag that controls whether or not the item labels for ALL series 
     * are visible.
     * 
     * @param visible  the flag (<code>null</code> permitted).
     */
    public void setItemLabelsVisible(Boolean visible);

    /**
     * Sets the visibility of item labels for ALL series and, if requested, 
     * sends a {@link RendererChangeEvent} to all registered listeners.
     * 
     * @param visible  a flag that controls whether or not the item labels are
     *                 visible (<code>null</code> permitted).
     * @param notify  a flag that controls whether or not listeners are 
     *                notified.
     */
    public void setItemLabelsVisible(Boolean visible, boolean notify);

    /**
     * Sets a flag that controls the visibility of the item labels for a series.
     * 
     * @param series  the series index (zero-based).
     * @param visible  the flag.
     */
    public void setSeriesItemLabelsVisible(int series, boolean visible);
    
    /**
     * Sets a flag that controls the visibility of the item labels for a series.
     * 
     * @param series  the series index (zero-based).
     * @param visible  the flag (<code>null</code> permitted).
     */
    public void setSeriesItemLabelsVisible(int series, Boolean visible);
    
    /**
     * Sets the visibility of item labels for a series and, if requested, sends 
     * a {@link RendererChangeEvent} to all registered listeners.
     * 
     * @param series  the series index (zero-based).
     * @param visible  the visible flag.
     * @param notify  a flag that controls whether or not listeners are 
     *                notified.
     */
    public void setSeriesItemLabelsVisible(int series, Boolean visible, 
                                           boolean notify);
    
    /**
     * Returns the base setting for item label visibility.
     * 
     * @return A flag (possibly <code>null</code>).
     */
    public Boolean getBaseItemLabelsVisible();
    
    /**
     * Sets the base flag that controls whether or not item labels are visible.
     * 
     * @param visible  the flag.
     */
    public void setBaseItemLabelsVisible(boolean visible);
    
    /**
     * Sets the base setting for item label visibility.
     * 
     * @param visible  the flag (<code>null</code> permitted).
     */
    public void setBaseItemLabelsVisible(Boolean visible);
    
    /**
     * Sets the base visibility for item labels and, if requested, sends a 
     * {@link RendererChangeEvent} to all registered listeners.
     * 
     * @param visible  the visibility flag.
     * @param notify  a flag that controls whether or not listeners are 
     *                notified.
     */
    public void setBaseItemLabelsVisible(Boolean visible, boolean notify);
    
    // LABEL GENERATOR
    
    /**
     * Returns the item label generator for the specified data item.
     *
     * @param series  the series index (zero-based).
     * @param item  the item index (zero-based).
     *
     * @return The generator (possibly <code>null</code>).
     */
    public CategoryLabelGenerator getLabelGenerator(int series, int item);

    /**
     * Returns the item label generator for a series.
     *
     * @param series  the series index (zero-based).
     *
     * @return The label generator (possibly <code>null</code>).
     */
    public CategoryLabelGenerator getSeriesLabelGenerator(int series);

    /**
     * Sets the item label generator for ALL series and sends a 
     * {@link RendererChangeEvent} to all registered listeners.  This overrides 
     * the per-series settings. 
     * 
     * @param generator  the generator (<code>null</code> permitted).
     */
    public void setLabelGenerator(CategoryLabelGenerator generator);
    
    /**
     * Sets the item label generator for a series and sends a 
     * {@link RendererChangeEvent} to all registered listeners.  
     *
     * @param series  the series index (zero-based).
     * @param generator  the generator.
     */
    public void setSeriesLabelGenerator(int series, 
                                        CategoryLabelGenerator generator);

    /**
     * Returns the base label generator.
     *
     * @return The generator (possibly <code>null</code>).
     */
    public CategoryLabelGenerator getBaseLabelGenerator();

    /**
     * Sets the base label generator and sends a {@link RendererChangeEvent}
     * to all registered listeners.
     *
     * @param generator  the generator (<code>null</code> permitted).
     */
    public void setBaseLabelGenerator(CategoryLabelGenerator generator);

    // TOOL TIP GENERATOR
    
    /**
     * Returns the tool tip generator that should be used for the specified 
     * item.  This method looks up the generator using the "three-layer" 
     * approach outlined in the general description of this interface.  
     *
     * @param row  the row index (zero-based).
     * @param column  the column index (zero-based).
     *
     * @return The generator (possibly <code>null</code>).
     */
    public CategoryToolTipGenerator getToolTipGenerator(int row, int column);

    /**
     * Returns the tool tip generator that will be used for ALL items in the 
     * dataset (the "layer 0" generator).
     * 
     * @return A tool tip generator (possibly <code>null</code>).
     */
    public CategoryToolTipGenerator getToolTipGenerator();

    /**
     * Sets the tool tip generator for ALL series and sends a 
     * {@link org.jfree.chart.event.RendererChangeEvent} to all registered 
     * listeners.
     * 
     * @param generator  the generator (<code>null</code> permitted).
     */
    public void setToolTipGenerator(CategoryToolTipGenerator generator);
    
    /**
     * Returns the tool tip generator for the specified series (a "layer 1" 
     * generator).
     *
     * @param series  the series index (zero-based).
     *
     * @return The tool tip generator (possibly <code>null</code>).
     */
    public CategoryToolTipGenerator getSeriesToolTipGenerator(int series);

    /**
     * Sets the tool tip generator for a series and sends a 
     * {@link org.jfree.chart.event.RendererChangeEvent} to all registered 
     * listeners.
     *
     * @param series  the series index (zero-based).
     * @param generator  the generator (<code>null</code> permitted).
     */
    public void setSeriesToolTipGenerator(int series, 
                                          CategoryToolTipGenerator generator);

    /**
     * Returns the base tool tip generator (the "layer 2" generator).
     *
     * @return The tool tip generator (possibly <code>null</code>).
     */
    public CategoryToolTipGenerator getBaseToolTipGenerator();

    /**
     * Sets the base tool tip generator and sends a 
     * {@link org.jfree.chart.event.RendererChangeEvent} to all registered 
     * listeners.
     *
     * @param generator  the generator (<code>null</code> permitted).
     */
    public void setBaseToolTipGenerator(CategoryToolTipGenerator generator);

    //// ITEM LABEL FONT  //////////////////////////////////////////////////////
    
    /**
     * Returns the font for an item label.
     * 
     * @param row  the row index (zero-based).
     * @param column  the column index (zero-based).
     * 
     * @return The font (never <code>null</code>).
     */
    public Font getItemLabelFont(int row, int column);

    /**
     * Returns the font used for all item labels.  This may be 
     * <code>null</code>, in which case the per series font settings will apply.
     * 
     * @return The font (possibly <code>null</code>).
     */
    public Font getItemLabelFont();
    
    /**
     * Sets the item label font for ALL series and sends a 
     * {@link RendererChangeEvent} to all registered listeners.  You can set 
     * this to <code>null</code> if you prefer to set the font on a per series 
     * basis.
     * 
     * @param font  the font (<code>null</code> permitted).
     */
    public void setItemLabelFont(Font font);
    
    /**
     * Returns the font for all the item labels in a series.
     * 
     * @param series  the series index (zero-based).
     * 
     * @return The font (possibly <code>null</code>).
     */
    public Font getSeriesItemLabelFont(int series);

    /**
     * Sets the item label font for a series and sends a 
     * {@link RendererChangeEvent} to all registered listeners.  
     * 
     * @param series  the series index (zero-based).
     * @param font  the font (<code>null</code> permitted).
     */
    public void setSeriesItemLabelFont(int series, Font font);

    /**
     * Returns the base item label font (this is used when no other font 
     * setting is available).
     * 
     * @return The font (<code>never</code> null).
     */
    public Font getBaseItemLabelFont();

    /**
     * Sets the base item label font and sends a {@link RendererChangeEvent} 
     * to all registered listeners.  
     * 
     * @param font  the font (<code>null</code> not permitted).
     */
    public void setBaseItemLabelFont(Font font);
    
    //// ITEM LABEL PAINT  /////////////////////////////////////////////////////

    /**
     * Returns the paint used to draw an item label.
     * 
     * @param row  the row index (zero based).
     * @param column  the column index (zero based).
     * 
     * @return The paint (never <code>null</code>).
     */
    public Paint getItemLabelPaint(int row, int column);
    
    /**
     * Returns the paint used for all item labels.  This may be 
     * <code>null</code>, in which case the per series paint settings will 
     * apply.
     * 
     * @return The paint (possibly <code>null</code>).
     */
    public Paint getItemLabelPaint();

    /**
     * Sets the item label paint for ALL series and sends a 
     * {@link RendererChangeEvent} to all registered listeners.
     * 
     * @param paint  the paint (<code>null</code> permitted).
     */
    public void setItemLabelPaint(Paint paint);

    /**
     * Returns the paint used to draw the item labels for a series.
     * 
     * @param series  the series index (zero based).
     * 
     * @return The paint (possibly <code>null<code>).
     */
    public Paint getSeriesItemLabelPaint(int series);

    /**
     * Sets the item label paint for a series and sends a 
     * {@link RendererChangeEvent} to all registered listeners.
     * 
     * @param series  the series (zero based index).
     * @param paint  the paint (<code>null</code> permitted).
     */
    public void setSeriesItemLabelPaint(int series, Paint paint);
    
    /**
     * Returns the base item label paint.
     * 
     * @return The paint (never <code>null<code>).
     */
    public Paint getBaseItemLabelPaint();

    /**
     * Sets the base item label paint and sends a {@link RendererChangeEvent} 
     * to all registered listeners.
     * 
     * @param paint  the paint (<code>null</code> not permitted).
     */
    public void setBaseItemLabelPaint(Paint paint);
    
    // POSITIVE ITEM LABEL POSITION...

    /**
     * Returns the item label position for positive values.
     * 
     * @param row  the row index (zero-based).
     * @param column  the column index (zero-based).
     * 
     * @return the item label position (never <code>null</code>).
     */
    public ItemLabelPosition getPositiveItemLabelPosition(int row, int column);

    /**
     * Returns the item label position for positive values in ALL series.
     * 
     * @return the item label position (possibly <code>null</code>).
     */
    public ItemLabelPosition getPositiveItemLabelPosition();

    /**
     * Sets the item label position for positive values in ALL series, and 
     * sends a {@link RendererChangeEvent} to all registered listeners.  You 
     * need to set this to <code>null</code> to expose the settings for 
     * individual series.
     * 
     * @param position  the position (<code>null</code> permitted).
     */
    public void setPositiveItemLabelPosition(ItemLabelPosition position);
    
    /**
     * Sets the positive item label position for ALL series and (if requested) 
     * sends a {@link RendererChangeEvent} to all registered listeners.
     * 
     * @param position  the position (<code>null</code> permitted).
     * @param notify  notify registered listeners?
     */
    public void setPositiveItemLabelPosition(ItemLabelPosition position, 
                                             boolean notify);

    /**
     * Returns the item label position for all positive values in a series.
     * 
     * @param series  the series index (zero-based).
     * 
     * @return The item label position.
     */
    public ItemLabelPosition getSeriesPositiveItemLabelPosition(int series);
    
    /**
     * Sets the item label position for all positive values in a series and 
     * sends a {@link RendererChangeEvent} to all registered listeners.
     * 
     * @param series  the series index (zero-based).
     * @param position  the position (<code>null</code> permitted).
     */
    public void setSeriesPositiveItemLabelPosition(int series, 
                                                   ItemLabelPosition position);

    /**
     * Sets the item label position for all positive values in a series and (if
     * requested) sends a {@link RendererChangeEvent} to all registered 
     * listeners.
     * 
     * @param series  the series index (zero-based).
     * @param position  the position (<code>null</code> permitted).
     * @param notify  notify registered listeners?
     */
    public void setSeriesPositiveItemLabelPosition(int series, 
                                                   ItemLabelPosition position, 
        boolean notify);

    /**
     * Returns the base positive item label position.
     * 
     * @return The position.
     */
    public ItemLabelPosition getBasePositiveItemLabelPosition();

    /**
     * Sets the base positive item label position.
     * 
     * @param position  the position.
     */
    public void setBasePositiveItemLabelPosition(ItemLabelPosition position);
    
    /**
     * Sets the base positive item label position and, if requested, sends a 
     * {@link RendererChangeEvent} to all registered listeners.
     * 
     * @param position  the position.
     * @param notify  notify registered listeners?
     */
    public void setBasePositiveItemLabelPosition(ItemLabelPosition position, 
                                                 boolean notify);
    
    
    // NEGATIVE ITEM LABEL POSITION...

    /**
     * Returns the item label position for negative values.  This method can be
     * overridden to provide customisation of the item label position for 
     * individual data items.
     * 
     * @param row  the row index (zero-based).
     * @param column  the column (zero-based).
     * 
     * @return the item label position.
     */
    public ItemLabelPosition getNegativeItemLabelPosition(int row, int column);

    /**
     * Returns the item label position for negative values in ALL series.
     * 
     * @return the item label position (possibly <code>null</code>).
     */
    public ItemLabelPosition getNegativeItemLabelPosition();

    /**
     * Sets the item label position for negative values in ALL series, and 
     * sends a {@link RendererChangeEvent} to all registered listeners.  You 
     * need to set this to <code>null</code> to expose the settings for 
     * individual series.
     * 
     * @param position  the position (<code>null</code> permitted).
     */
    public void setNegativeItemLabelPosition(ItemLabelPosition position);
    
    /**
     * Sets the item label position for negative values in ALL series and (if 
     * requested) sends a {@link RendererChangeEvent} to all registered 
     * listeners.  
     * 
     * @param position  the position (<code>null</code> permitted).
     * @param notify  notify registered listeners?
     */
    public void setNegativeItemLabelPosition(ItemLabelPosition position, 
                                             boolean notify);

    /**
     * Returns the item label position for all negative values in a series.
     * 
     * @param series  the series index (zero-based).
     * 
     * @return The item label position.
     */
    public ItemLabelPosition getSeriesNegativeItemLabelPosition(int series);

    /**
     * Sets the item label position for negative values in a series and sends a 
     * {@link RendererChangeEvent} to all registered listeners.
     * 
     * @param series  the series index (zero-based).
     * @param position  the position (<code>null</code> permitted).
     */
    public void setSeriesNegativeItemLabelPosition(int series, 
                                                   ItemLabelPosition position);

    /**
     * Sets the item label position for negative values in a series and (if 
     * requested) sends a {@link RendererChangeEvent} to all registered 
     * listeners.
     * 
     * @param series  the series index (zero-based).
     * @param position  the position (<code>null</code> permitted).
     * @param notify  notify registered listeners?
     */
    public void setSeriesNegativeItemLabelPosition(int series, 
                                                   ItemLabelPosition position, 
                                                   boolean notify);

    /**
     * Returns the base item label position for negative values.
     * 
     * @return The position.
     */
    public ItemLabelPosition getBaseNegativeItemLabelPosition();

    /**
     * Sets the base item label position for negative values and sends a 
     * {@link RendererChangeEvent} to all registered listeners.
     * 
     * @param position  the position.
     */
    public void setBaseNegativeItemLabelPosition(ItemLabelPosition position);
    
    /**
     * Sets the base negative item label position and, if requested, sends a 
     * {@link RendererChangeEvent} to all registered listeners.
     * 
     * @param position  the position.
     * @param notify  notify registered listeners?
     */
    public void setBaseNegativeItemLabelPosition(ItemLabelPosition position, 
                                                 boolean notify);
    
    // ITEM URL GENERATOR
    
    /**
     * Returns the URL generator for an item.
     *
     * @param series  the series index (zero-based).
     * @param item  the item index (zero-based).
     *
     * @return The item URL generator.
     */
    public CategoryURLGenerator getItemURLGenerator(int series, int item);

    /**
     * Returns the item URL generator for a series.
     *
     * @param series  the series index (zero-based).
     *
     * @return The URL generator.
     */
    public CategoryURLGenerator getSeriesItemURLGenerator(int series);

    /**
     * Sets the item URL generator for ALL series. 
     * 
     * @param generator  the generator.
     */
    public void setItemURLGenerator(CategoryURLGenerator generator);
    
    /**
     * Sets the item URL generator for a series.
     *
     * @param series  the series index (zero-based).
     * @param generator  the generator.
     */
    public void setSeriesItemURLGenerator(int series, 
                                          CategoryURLGenerator generator);

    /**
     * Returns the base item URL generator.
     *
     * @return The item URL generator.
     */
    public CategoryURLGenerator getBaseItemURLGenerator();

    /**
     * Sets the base item URL generator.
     *
     * @param generator  the item URL generator.
     */
    public void setBaseItemURLGenerator(CategoryURLGenerator generator);

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

    /**
     * Draws a background for the data area.
     *
     * @param g2  the graphics device.
     * @param plot  the plot.
     * @param dataArea  the data area.
     */
    public void drawBackground(Graphics2D g2,
                               CategoryPlot plot,
                               Rectangle2D dataArea);

    /**
     * Draws an outline for the data area.
     *
     * @param g2  the graphics device.
     * @param plot  the plot.
     * @param dataArea  the data area.
     */
    public void drawOutline(Graphics2D g2,
                            CategoryPlot plot,
                            Rectangle2D dataArea);

    /**
     * Draws a single data item.
     *
     * @param g2  the graphics device.
     * @param state  state information for one chart.
     * @param dataArea  the data plot area.
     * @param plot  the plot.
     * @param domainAxis  the domain axis.
     * @param rangeAxis  the range axis.
     * @param dataset  the data.
     * @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);

    /**
     * Draws a grid line against the domain axis.
     *
     * @param g2  the graphics device.
     * @param plot  the plot.
     * @param dataArea  the area for plotting data (not yet adjusted for any 
     *                  3D effect).
     * @param value  the value.
     */
    public void drawDomainGridline(Graphics2D g2,
                                   CategoryPlot plot,
                                   Rectangle2D dataArea,
                                   double value);

    /**
     * Draws a grid line against the range axis.
     *
     * @param g2  the graphics device.
     * @param plot  the plot.
     * @param axis  the value axis.
     * @param dataArea  the area for plotting data (not yet adjusted for any 
     *                  3D effect).
     * @param value  the value.
     */
    public void drawRangeGridline(Graphics2D g2,
                                  CategoryPlot plot,
                                  ValueAxis axis,
                                  Rectangle2D dataArea,
                                  double value);

    /**
     * Draws a line (or some other marker) to indicate a particular value on 
     * the range axis.
     *
     * @param g2  the graphics device.
     * @param plot  the plot.
     * @param axis  the value axis.
     * @param marker  the marker.
     * @param dataArea  the area for plotting data (not including 3D effect).
     */
    public void drawRangeMarker(Graphics2D g2,
                                CategoryPlot plot,
                                ValueAxis axis,
                                Marker marker,
                                Rectangle2D dataArea);

}