/* ===========================================================
 * JFreeChart : a free chart library for the Java(tm) platform
 * ===========================================================
 *
 * (C) Copyright 2000-present, by David Gilbert 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.
 *
 * [Oracle and Java are registered trademarks of Oracle and/or its affiliates. 
 * Other names may be trademarks of their respective owners.]
 *
 * -------------------
 * XYItemRenderer.java
 * -------------------
 * (C) Copyright 2001-present, by David Gilbert and Contributors.
 *
 * Original Author:  David Gilbert;
 * Contributor(s):   Mark Watson (www.markwatson.com);
 *                   Sylvain Vieujot;
 *                   Focus Computer Services Limited;
 *                   Richard Atkinson;
 *
 */

package org.jfree.chart.renderer.xy;

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.annotations.XYAnnotation;
import org.jfree.chart.axis.ValueAxis;
import org.jfree.chart.event.RendererChangeEvent;
import org.jfree.chart.event.RendererChangeListener;
import org.jfree.chart.labels.ItemLabelPosition;
import org.jfree.chart.labels.XYItemLabelGenerator;
import org.jfree.chart.labels.XYSeriesLabelGenerator;
import org.jfree.chart.labels.XYToolTipGenerator;
import org.jfree.chart.plot.CrosshairState;
import org.jfree.chart.plot.Marker;
import org.jfree.chart.plot.PlotRenderingInfo;
import org.jfree.chart.plot.XYPlot;
import org.jfree.chart.ui.Layer;
import org.jfree.chart.urls.XYURLGenerator;
import org.jfree.data.Range;
import org.jfree.data.xy.XYDataset;

/**
 * Interface for rendering the visual representation of a single (x, y) item on
 * an {@link XYPlot}.
 * <p>
 * To support cloning charts, it is recommended that renderers implement both
 * the {@link Cloneable} and {@code PublicCloneable} interfaces.
 */
public interface XYItemRenderer extends LegendItemSource {

    /**
     * Returns the plot that this renderer has been assigned to.
     *
     * @return The plot.
     */
    XYPlot getPlot();

    /**
     * Sets the plot that this renderer is assigned to.  This method will be
     * called by the plot class...you do not need to call it yourself.
     *
     * @param plot  the plot.
     */
    void setPlot(XYPlot plot);

    /**
     * Returns the number of passes through the data required by the renderer.
     *
     * @return The pass count.
     */
    int getPassCount();

    /**
     * Returns the lower and upper bounds (range) of the x-values in the
     * specified dataset.
     *
     * @param dataset  the dataset ({@code null} permitted).
     *
     * @return The range.
     */
    Range findDomainBounds(XYDataset dataset);

    /**
     * Returns the lower and upper bounds (range) of the y-values in the
     * specified dataset.  The implementation of this method will take
     * into account the presentation used by the renderers (for example,
     * a renderer that "stacks" values will return a bigger range than
     * a renderer that doesn't).
     *
     * @param dataset  the dataset ({@code null} permitted).
     *
     * @return The range (or {@code null} if the dataset is
     *         {@code null} or empty).
     */
    Range findRangeBounds(XYDataset dataset);

    /**
     * Add a renderer change listener.
     *
     * @param listener  the listener.
     *
     * @see #removeChangeListener(RendererChangeListener)
     */
    void addChangeListener(RendererChangeListener listener);

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


    //// VISIBLE //////////////////////////////////////////////////////////////

    /**
     * Returns a boolean that indicates whether or not the specified item
     * should be drawn (this is typically used to hide an entire series).
     *
     * @param series  the series index.
     * @param item  the item index.
     *
     * @return A boolean.
     */
    boolean getItemVisible(int series, int item);

    /**
     * Returns a boolean that indicates whether or not the specified series
     * should be drawn (this is typically used to hide an entire series).
     *
     * @param series  the series index.
     *
     * @return A boolean.
     */
    boolean isSeriesVisible(int series);

    /**
     * Returns the flag that controls whether a series is visible.
     *
     * @param series  the series index (zero-based).
     *
     * @return The flag (possibly {@code null}).
     *
     * @see #setSeriesVisible(int, Boolean)
     */
    Boolean getSeriesVisible(int series);

    /**
     * Sets the flag that controls whether a series is visible and sends a
     * {@link RendererChangeEvent} to all registered listeners.
     *
     * @param series  the series index (zero-based).
     * @param visible  the flag ({@code null} permitted).
     *
     * @see #getSeriesVisible(int)
     */
    void setSeriesVisible(int series, Boolean visible);

    /**
     * Sets the flag that controls whether a series is visible and, if
     * requested, sends a {@link RendererChangeEvent} to all registered
     * listeners.
     *
     * @param series  the series index.
     * @param visible  the flag ({@code null} permitted).
     * @param notify  notify listeners?
     *
     * @see #getSeriesVisible(int)
     */
    void setSeriesVisible(int series, Boolean visible, boolean notify);

    /**
     * Returns the default visibility for all series.
     *
     * @return The default visibility.
     *
     * @see #setDefaultSeriesVisible(boolean)
     */
    boolean getDefaultSeriesVisible();

    /**
     * Sets the default visibility and sends a {@link RendererChangeEvent} to all
     * registered listeners.
     *
     * @param visible  the flag.
     *
     * @see #getDefaultSeriesVisible()
     */
    void setDefaultSeriesVisible(boolean visible);

    /**
     * Sets the default visibility and, if requested, sends
     * a {@link RendererChangeEvent} to all registered listeners.
     *
     * @param visible  the visibility.
     * @param notify  notify listeners?
     *
     * @see #getDefaultSeriesVisible()
     */
    void setDefaultSeriesVisible(boolean visible, boolean notify);

    // SERIES VISIBLE IN LEGEND (not yet respected by all renderers)

    /**
     * Returns {@code true} if the series should be shown in the legend,
     * and {@code false} otherwise.
     *
     * @param series  the series index.
     *
     * @return A boolean.
     */
    boolean isSeriesVisibleInLegend(int series);

    /**
     * Returns the flag that controls whether a series is visible in the
     * legend.  This method returns only the "per series" settings - to
     * incorporate the override and base settings as well, you need to use the
     * {@link #isSeriesVisibleInLegend(int)} method.
     *
     * @param series  the series index (zero-based).
     *
     * @return The flag (possibly {@code null}).
     *
     * @see #setSeriesVisibleInLegend(int, Boolean)
     */
    Boolean getSeriesVisibleInLegend(int series);

    /**
     * Sets the flag that controls whether a series is visible in the legend
     * and sends a {@link RendererChangeEvent} to all registered listeners.
     *
     * @param series  the series index (zero-based).
     * @param visible  the flag ({@code null} permitted).
     *
     * @see #getSeriesVisibleInLegend(int)
     */
    void setSeriesVisibleInLegend(int series, Boolean visible);

    /**
     * Sets the flag that controls whether a series is visible in the legend
     * and, if requested, sends a {@link RendererChangeEvent} to all registered
     * listeners.
     *
     * @param series  the series index.
     * @param visible  the flag ({@code null} permitted).
     * @param notify  notify listeners?
     *
     * @see #getSeriesVisibleInLegend(int)
     */
    void setSeriesVisibleInLegend(int series, Boolean visible,
                                  boolean notify);

    /**
     * Returns the default visibility in the legend for all series.
     *
     * @return The default visibility.
     *
     * @see #setDefaultSeriesVisibleInLegend(boolean)
     */
    boolean getDefaultSeriesVisibleInLegend();

    /**
     * Sets the default visibility in the legend and sends a
     * {@link RendererChangeEvent} to all registered listeners.
     *
     * @param visible  the flag.
     *
     * @see #getDefaultSeriesVisibleInLegend()
     */
    void setDefaultSeriesVisibleInLegend(boolean visible);

    /**
     * Sets the default visibility in the legend and, if requested, sends
     * a {@link RendererChangeEvent} to all registered listeners.
     *
     * @param visible  the visibility.
     * @param notify  notify listeners?
     *
     * @see #getDefaultSeriesVisibleInLegend()
     */
    void setDefaultSeriesVisibleInLegend(boolean visible, boolean notify);


    //// PAINT ////////////////////////////////////////////////////////////////

    /**
     * Returns the paint used to color 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}).
     */
    Paint getItemPaint(int row, int column);

    /**
     * Returns the paint used to color an item drawn by the renderer.
     *
     * @param series  the series index (zero-based).
     *
     * @return The paint (possibly {@code null}).
     *
     * @see #setSeriesPaint(int, Paint)
     */
    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} permitted).
     *
     * @see #getSeriesPaint(int)
     */
    void setSeriesPaint(int series, Paint paint);

    /**
     * Sets the paint used for a series and sends a {@link RendererChangeEvent}
     * to all registered listeners if requested.
     *
     * @param series  the series index (zero-based).
     * @param paint  the paint ({@code null} permitted).
     * @param notify  send a change event?
     *
     * @see #getSeriesPaint(int)
     */
    void setSeriesPaint(int series, Paint paint, boolean notify);

    /**
     * Returns the default paint.
     *
     * @return The default paint (never {@code null}).
     *
     * @see #setDefaultPaint(Paint)
     */
    Paint getDefaultPaint();

    /**
     * Sets the default paint and sends a {@link RendererChangeEvent} to all
     * registered listeners.
     *
     * @param paint  the paint ({@code null} not permitted).
     *
     * @see #getDefaultPaint()
     */
    void setDefaultPaint(Paint paint);

    /**
     * Sets the default paint and sends a {@link RendererChangeEvent} to all
     * registered listeners if requested.
     *
     * @param paint  the paint ({@code null} not permitted).
     * @param notify  send a change event?
     *
     * @see #getDefaultPaint()
     */
    void setDefaultPaint(Paint paint, boolean notify);

    // FILL 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}).
     */
    Paint getItemFillPaint(int row, int column);

    /**
     * Returns the paint used to fill an item drawn by the renderer.
     *
     * @param series  the series index (zero-based).
     *
     * @return The paint (possibly {@code null}).
     */
    Paint getSeriesFillPaint(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} permitted).
     */
    void setSeriesFillPaint(int series, Paint paint);

    /**
     * Sets the paint used for a series and sends a
     * {@link RendererChangeEvent} to all registered listeners if requested.
     *
     * @param series  the series index (zero-based).
     * @param paint  the paint ({@code null} permitted).
     * @param notify  send a change event?
     */
    void setSeriesFillPaint(int series, Paint paint, boolean notify);

    /**
     * Returns the default paint.
     *
     * @return The default paint (never {@code null}).
     */
    Paint getDefaultFillPaint();

    /**
     * Sets the default paint and sends a {@link RendererChangeEvent} to all
     * registered listeners.
     *
     * @param paint  the paint ({@code null} not permitted).
     */
    void setDefaultFillPaint(Paint paint);

    /**
     * Sets the default paint and sends a {@link RendererChangeEvent} to all
     * registered listeners if requested.
     *
     * @param paint  the paint ({@code null} not permitted).
     * @param notify  send a change event?
     */
    void setDefaultFillPaint(Paint paint, boolean notify);

    //// 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}).
     */
    Paint getItemOutlinePaint(int row, int column);

    /**
     * Returns the paint used to outline an item drawn by the renderer.
     *
     * @param series  the series (zero-based index).
     *
     * @return The paint (possibly {@code null}).
     *
     * @see #setSeriesOutlinePaint(int, Paint)
     */
    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} permitted).
     *
     * @see #getSeriesOutlinePaint(int)
     */
    void setSeriesOutlinePaint(int series, Paint paint);

    /**
     * Sets the paint used for a series outline and sends a
     * {@link RendererChangeEvent} to all registered listeners if requested.
     *
     * @param series  the series index (zero-based).
     * @param paint  the paint ({@code null} permitted).
     * @param notify  send a change event?
     *
     * @see #getSeriesOutlinePaint(int)
     */
    void setSeriesOutlinePaint(int series, Paint paint, boolean notify);

    /**
     * Returns the default outline paint.
     *
     * @return The paint (never {@code null}).
     *
     * @see #setDefaultOutlinePaint(Paint)
     */
    Paint getDefaultOutlinePaint();

    /**
     * Sets the default outline paint and sends a {@link RendererChangeEvent} to
     * all registered listeners.
     *
     * @param paint  the paint ({@code null} not permitted).
     *
     * @see #getDefaultOutlinePaint()
     */
    void setDefaultOutlinePaint(Paint paint);

    /**
     * Sets the default outline paint and sends a {@link RendererChangeEvent} to
     * all registered listeners if requested.
     *
     * @param paint  the paint ({@code null} not permitted).
     * @param notify  send a change event?
     *
     * @see #getDefaultOutlinePaint()
     */
    void setDefaultOutlinePaint(Paint paint, boolean notify);

    //// 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}).
     */
    Stroke getItemStroke(int row, int column);

    /**
     * Returns the stroke used to draw the items in a series.
     *
     * @param series  the series (zero-based index).
     *
     * @return The stroke (possibly {@code null}).
     *
     * @see #setSeriesStroke(int, Stroke)
     */
    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} permitted).
     *
     * @see #getSeriesStroke(int)
     */
    void setSeriesStroke(int series, Stroke stroke);

    /**
     * Sets the stroke used for a series and sends a
     * {@link RendererChangeEvent} to all registered listeners if requested.
     *
     * @param series  the series index (zero-based).
     * @param stroke  the stroke ({@code null} permitted).
     * @param notify  send a change event?
     *
     * @see #getSeriesStroke(int)
     */
    void setSeriesStroke(int series, Stroke stroke, boolean notify);

    /**
     * Returns the default stroke.
     *
     * @return The default stroke (never {@code null}).
     *
     * @see #setDefaultStroke(Stroke)
     */
    Stroke getDefaultStroke();

    /**
     * Sets the default stroke and sends a {@link RendererChangeEvent} to all
     * registered listeners.
     *
     * @param stroke  the stroke ({@code null} not permitted).
     *
     * @see #getDefaultStroke()
     */
    void setDefaultStroke(Stroke stroke);

    /**
     * Sets the default stroke and sends a {@link RendererChangeEvent} to all
     * registered listeners if requested.
     *
     * @param stroke  the stroke ({@code null} not permitted).
     * @param notify  send a change event?
     *
     * @see #getDefaultStroke()
     */
    void setDefaultStroke(Stroke stroke, boolean notify);

    //// OUTLINE STROKE ///////////////////////////////////////////////////////

    /**
     * Returns the stroke used to outline data items.  The default
     * implementation passes control to the lookupSeriesOutlineStroke 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}).
     */
    Stroke getItemOutlineStroke(int row, int column);

    /**
     * Returns the stroke used to outline the items in a series.
     *
     * @param series  the series (zero-based index).
     *
     * @return The stroke (possibly {@code null}).
     *
     * @see #setSeriesOutlineStroke(int, Stroke)
     */
    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} permitted).
     *
     * @see #getSeriesOutlineStroke(int)
     */
    void setSeriesOutlineStroke(int series, Stroke stroke);

    /**
     * Sets the outline stroke used for a series and sends a
     * {@link RendererChangeEvent} to all registered listeners if requested.
     *
     * @param series  the series index (zero-based).
     * @param stroke  the stroke ({@code null} permitted).
     * @param notify  send a change event?
     *
     * @see #getSeriesOutlineStroke(int)
     */
    void setSeriesOutlineStroke(int series, Stroke stroke, boolean notify);

    /**
     * Returns the default outline stroke.
     *
     * @return The stroke (never {@code null}).
     *
     * @see #setDefaultOutlineStroke(Stroke)
     */
    Stroke getDefaultOutlineStroke();

    /**
     * Sets the base outline stroke and sends a {@link RendererChangeEvent} to
     * all registered listeners.
     *
     * @param stroke  the stroke ({@code null} not permitted).
     *
     * @see #getDefaultOutlineStroke()
     */
    void setDefaultOutlineStroke(Stroke stroke);

    /**
     * Sets the base outline stroke and sends a {@link RendererChangeEvent} to
     * all registered listeners if requested.
     *
     * @param stroke  the stroke ({@code null} not permitted).
     * @param notify  send a change event.
     *
     * @see #getDefaultOutlineStroke()
     */
    void setDefaultOutlineStroke(Stroke stroke, boolean notify);

    //// 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}).
     */
    Shape getItemShape(int row, int column);

    /**
     * Returns a shape used to represent the items in a series.
     *
     * @param series  the series (zero-based index).
     *
     * @return The shape (possibly {@code null}).
     *
     * @see #setSeriesShape(int, Shape)
     */
    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} permitted).
     *
     * @see #getSeriesShape(int)
     */
    void setSeriesShape(int series, Shape shape);

    /**
     * Sets the shape used for a series and sends a {@link RendererChangeEvent}
     * to all registered listeners if requested.
     *
     * @param series  the series index (zero-based).
     * @param shape  the shape ({@code null} permitted).
     * @param notify  send a change event?
     *
     * @see #getSeriesShape(int)
     */
    void setSeriesShape(int series, Shape shape, boolean notify);

    /**
     * Returns the default shape.
     *
     * @return The shape (never {@code null}).
     *
     * @see #setDefaultShape(Shape)
     */
    Shape getDefaultShape();

    /**
     * Sets the default shape and sends a {@link RendererChangeEvent} to all
     * registered listeners.
     *
     * @param shape  the shape ({@code null} not permitted).
     *
     * @see #getDefaultShape()
     */
    void setDefaultShape(Shape shape);

    /**
     * Sets the default shape and sends a {@link RendererChangeEvent} to all
     * registered listeners if requested.
     *
     * @param shape  the shape ({@code null} not permitted).
     * @param notify  send a change event?
     *
     * @see #getDefaultShape()
     */
    void setDefaultShape(Shape shape, boolean notify);


    //// LEGEND ITEMS /////////////////////////////////////////////////////////

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


    //// LEGEND ITEM LABEL GENERATOR //////////////////////////////////////////

    /**
     * Returns the legend item label generator.
     *
     * @return The legend item label generator (never {@code null}).
     *
     * @see #setLegendItemLabelGenerator(XYSeriesLabelGenerator)
     */
    XYSeriesLabelGenerator getLegendItemLabelGenerator();

    /**
     * Sets the legend item label generator and sends a
     * {@link RendererChangeEvent} to all registered listeners.
     *
     * @param generator  the generator ({@code null} not permitted).
     */
    void setLegendItemLabelGenerator(XYSeriesLabelGenerator generator);


    //// TOOL TIP GENERATOR ///////////////////////////////////////////////////

    /**
     * Returns the tool tip generator for a data item.
     *
     * @param row  the row index (zero based).
     * @param column  the column index (zero based).
     *
     * @return The generator (possibly {@code null}).
     */
    XYToolTipGenerator getToolTipGenerator(int row, int column);

    /**
     * Returns the tool tip generator for a series.
     *
     * @param series  the series index (zero based).
     *
     * @return The generator (possibly {@code null}).
     *
     * @see #setSeriesToolTipGenerator(int, XYToolTipGenerator)
     */
    XYToolTipGenerator getSeriesToolTipGenerator(int series);

    /**
     * Sets the tool tip generator for a series and sends a
     * {@link RendererChangeEvent} to all registered listeners.
     *
     * @param series  the series index (zero based).
     * @param generator  the generator ({@code null} permitted).
     *
     * @see #getSeriesToolTipGenerator(int)
     */
    void setSeriesToolTipGenerator(int series,
                                   XYToolTipGenerator generator);

    /**
     * Returns the default tool tip generator.
     *
     * @return The generator (possibly {@code null}).
     *
     * @see #setDefaultToolTipGenerator(XYToolTipGenerator)
     */
    XYToolTipGenerator getDefaultToolTipGenerator();

    /**
     * Sets the default tool tip generator and sends a {@link RendererChangeEvent}
     * to all registered listeners.
     *
     * @param generator  the generator ({@code null} permitted).
     *
     * @see #getDefaultToolTipGenerator()
     */
    void setDefaultToolTipGenerator(XYToolTipGenerator generator);

    //// URL GENERATOR ////////////////////////////////////////////////////////

    /**
     * Returns the URL generator for HTML image maps.
     *
     * @return The URL generator (possibly null).
     */
    XYURLGenerator getURLGenerator();

    /**
     * Sets the URL generator for HTML image maps.
     *
     * @param urlGenerator the URL generator (null permitted).
     */
    void setURLGenerator(XYURLGenerator urlGenerator);

    //// ITEM LABELS VISIBLE //////////////////////////////////////////////////

    /**
     * Returns {@code true} if an item label is visible, and
     * {@code false} otherwise.
     *
     * @param row  the row index (zero-based).
     * @param column  the column index (zero-based).
     *
     * @return A boolean.
     */
    boolean isItemLabelVisible(int row, int column);

    /**
     * Returns {@code true} if the item labels for a series are visible,
     * and {@code false} otherwise.
     *
     * @param series  the series index (zero-based).
     *
     * @return A boolean.
     */
    boolean isSeriesItemLabelsVisible(int series);

    /**
     * Sets a flag that controls the visibility of the item labels for a
     * series and sends a {@link RendererChangeEvent} to all registered
     * listeners.
     *
     * @param series  the series index (zero-based).
     * @param visible  the flag.
     *
     * @see #isSeriesItemLabelsVisible(int)
     */
    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} permitted).
     *
     * @see #isSeriesItemLabelsVisible(int)
     */
    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.
     *
     * @see #isSeriesItemLabelsVisible(int)
     */
    void setSeriesItemLabelsVisible(int series, Boolean visible,
                                    boolean notify);

    /**
     * Returns the default setting for item label visibility.
     *
     * @return A flag (possibly {@code null}).
     *
     * @see #setDefaultItemLabelsVisible(boolean)
     */
    boolean getDefaultItemLabelsVisible();

    /**
     * Sets the default flag that controls whether or not item labels are visible.
     *
     * @param visible  the flag.
     *
     * @see #getDefaultItemLabelsVisible()
     */
    void setDefaultItemLabelsVisible(boolean visible);

    /**
     * Sets the default 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.
     *
     * @see #getDefaultItemLabelsVisible()
     */
    void setDefaultItemLabelsVisible(boolean visible, boolean notify);


    //// ITEM LABEL GENERATOR /////////////////////////////////////////////////

    /**
     * Returns the item label generator for a data item.
     *
     * @param row  the row index (zero based).
     * @param column  the column index (zero based).
     *
     * @return The generator (possibly {@code null}).
     */
    XYItemLabelGenerator getItemLabelGenerator(int row, int column);

    /**
     * Returns the item label generator for a series.
     *
     * @param series  the series index (zero based).
     *
     * @return The generator (possibly {@code null}).
     *
     * @see #setSeriesItemLabelGenerator(int, XYItemLabelGenerator)
     */
    XYItemLabelGenerator getSeriesItemLabelGenerator(int series);

    /**
     * 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 ({@code null} permitted).
     *
     * @see #getSeriesItemLabelGenerator(int)
     */
    void setSeriesItemLabelGenerator(int series,
                                     XYItemLabelGenerator generator);

    /**
     * Returns the default item label generator.
     *
     * @return The generator (possibly {@code null}).
     *
     * @see #setDefaultItemLabelGenerator(XYItemLabelGenerator)
     */
    XYItemLabelGenerator getDefaultItemLabelGenerator();

    /**
     * Sets the default item label generator and sends a
     * {@link RendererChangeEvent} to all registered listeners.
     *
     * @param generator  the generator ({@code null} permitted).
     *
     * @see #getDefaultItemLabelGenerator()
     */
    void setDefaultItemLabelGenerator(XYItemLabelGenerator 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}).
     */
    Font getItemLabelFont(int row, int column);

    /**
     * Returns the font for all the item labels in a series.
     *
     * @param series  the series index (zero-based).
     *
     * @return The font (possibly {@code null}).
     */
    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} permitted).
     *
     * @see #getSeriesItemLabelFont(int)
     */
    void setSeriesItemLabelFont(int series, Font font);

    /**
     * Returns the default item label font (this is used when no other font
     * setting is available).
     *
     * @return The font (never {@code null}).
     *
     * @see #setDefaultItemLabelFont(Font)
     */
    Font getDefaultItemLabelFont();

    /**
     * Sets the default item label font and sends a {@link RendererChangeEvent}
     * to all registered listeners.
     *
     * @param font  the font ({@code null} not permitted).
     *
     * @see #getDefaultItemLabelFont()
     */
    void setDefaultItemLabelFont(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}).
     */
    Paint getItemLabelPaint(int row, int column);

    /**
     * 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}).
     *
     * @see #setSeriesItemLabelPaint(int, Paint)
     */
    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} permitted).
     *
     * @see #getSeriesItemLabelPaint(int)
     */
    void setSeriesItemLabelPaint(int series, Paint paint);

    /**
     * Returns the default item label paint.
     *
     * @return The paint (never {@code null}).
     */
    Paint getDefaultItemLabelPaint();

    /**
     * Sets the default item label paint and sends a {@link RendererChangeEvent}
     * to all registered listeners.
     *
     * @param paint  the paint ({@code null} not permitted).
     */
    void setDefaultItemLabelPaint(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}).
     */
    ItemLabelPosition getPositiveItemLabelPosition(int row, int column);

    /**
     * Returns the item label position for all positive values in a series.
     *
     * @param series  the series index (zero-based).
     *
     * @return The item label position (never {@code null}).
     */
    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} permitted).
     */
    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} permitted).
     * @param notify  notify registered listeners?
     */
    void setSeriesPositiveItemLabelPosition(int series,
                                            ItemLabelPosition position, boolean notify);

    /**
     * Returns the default positive item label position.
     *
     * @return The position (never {@code null}).
     */
    ItemLabelPosition getDefaultPositiveItemLabelPosition();

    /**
     * Sets the default positive item label position.
     *
     * @param position  the position ({@code null} not permitted).
     */
    void setDefaultPositiveItemLabelPosition(ItemLabelPosition position);

    /**
     * Sets the default positive item label position and, if requested, sends a
     * {@link RendererChangeEvent} to all registered listeners.
     *
     * @param position  the position ({@code null} not permitted).
     * @param notify  notify registered listeners?
     */
    void setDefaultPositiveItemLabelPosition(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 (never {@code null}).
     */
    ItemLabelPosition getNegativeItemLabelPosition(int row, int column);

    /**
     * Returns the item label position for all negative values in a series.
     *
     * @param series  the series index (zero-based).
     *
     * @return The item label position (never {@code null}).
     */
    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} permitted).
     */
    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} permitted).
     * @param notify  notify registered listeners?
     */
    void setSeriesNegativeItemLabelPosition(int series,
                                            ItemLabelPosition position, boolean notify);

    /**
     * Returns the default item label position for negative values.
     *
     * @return The position (never {@code null}).
     */
    ItemLabelPosition getDefaultNegativeItemLabelPosition();

    /**
     * Sets the default item label position for negative values and sends a
     * {@link RendererChangeEvent} to all registered listeners.
     *
     * @param position  the position ({@code null} not permitted).
     */
    void setDefaultNegativeItemLabelPosition(ItemLabelPosition position);

    /**
     * Sets the default negative item label position and, if requested, sends a
     * {@link RendererChangeEvent} to all registered listeners.
     *
     * @param position  the position ({@code null} not permitted).
     * @param notify  notify registered listeners?
     */
    void setDefaultNegativeItemLabelPosition(ItemLabelPosition position,
                                             boolean notify);


    // CREATE ENTITIES

    /**
     * Returns {@code true} if an entity should be created for an item, and
     * {@code false} otherwise.
     * 
     * @param series  the series.
     * @param item  the item.
     * 
     * @return A boolean.
     */
    boolean getItemCreateEntity(int series, int item);

    /**
     * Returns {@code true} if entities should be created for a series, and
     * {@code false} otherwise.  This method can return {@code null} in which
     * case the renderering framework will look at the default setting.
     * 
     * @param series  the series.
     * 
     * @return A boolean.
     */
    Boolean getSeriesCreateEntities(int series);

    /**
     * Sets a flag that specifies whether or not entities should be created for
     * a series during rendering, and sends a change event to registered 
     * listeners.
     * 
     * @param series  the series.
     * @param create  the flag value ({@code null} permitted).
     */
    void setSeriesCreateEntities(int series, Boolean create);

    /**
     * Sets a flag that specifies whether or not entities should be created for
     * a series during rendering, and sends a change event to registered 
     * listeners.
     * 
     * @param series  the series.
     * @param create  the flag value ({@code null} permitted).
     * @param notify  send a change event?
     */
    void setSeriesCreateEntities(int series, Boolean create,
                                 boolean notify);

    /**
     * Returns the default value determining whether or not entities should be
     * created by the renderer.
     * 
     * @return A boolean. 
     */
    boolean getDefaultCreateEntities();

    /**
     * Sets the default value determining whether or not entities should be
     * created by the renderer, and sends a change event to all registered
     * listeners.
     * 
     * @param create  the flag value.
     */
    void setDefaultCreateEntities(boolean create);

    /**
     * Sets the default value determining whether or not entities should be
     * created by the renderer, and sends a change event to all registered
     * listeners.
     * 
     * @param create  the flag value.
     * @param notify  notify listeners?
     */
    void setDefaultCreateEntities(boolean create, boolean notify);

    //// ANNOTATIONS //////////////////////////////////////////////////////////

    /**
     * Adds an annotation and sends a {@link RendererChangeEvent} to all
     * registered listeners.  The annotation is added to the foreground
     * layer.
     *
     * @param annotation  the annotation ({@code null} not permitted).
     */
    void addAnnotation(XYAnnotation annotation);

    /**
     * Adds an annotation to the specified layer.
     *
     * @param annotation  the annotation ({@code null} not permitted).
     * @param layer  the layer ({@code null} not permitted).
     */
    void addAnnotation(XYAnnotation annotation, Layer layer);

    /**
     * Removes the specified annotation and sends a {@link RendererChangeEvent}
     * to all registered listeners.
     *
     * @param annotation  the annotation to remove ({@code null} not
     *                    permitted).
     *
     * @return A boolean to indicate whether or not the annotation was
     *         successfully removed.
     */
    boolean removeAnnotation(XYAnnotation annotation);

    /**
     * Removes all annotations and sends a {@link RendererChangeEvent}
     * to all registered listeners.
     */
    void removeAnnotations();

    /**
     * Draws all the annotations for the specified layer.
     *
     * @param g2  the graphics device.
     * @param dataArea  the data area.
     * @param domainAxis  the domain axis.
     * @param rangeAxis  the range axis.
     * @param layer  the layer.
     * @param info  the plot rendering info.
     */
    void drawAnnotations(Graphics2D g2, Rectangle2D dataArea,
                         ValueAxis domainAxis, ValueAxis rangeAxis, Layer layer,
                         PlotRenderingInfo info);

    //// DRAWING //////////////////////////////////////////////////////////////

    /**
     * Initialises the renderer then returns the number of 'passes' through the
     * data that the renderer will require (usually just one).  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 dataset  the dataset.
     * @param info  an optional info collection object to return data back to
     *              the caller.
     *
     * @return The number of passes the renderer requires.
     */
    XYItemRendererState initialise(Graphics2D g2, Rectangle2D dataArea,
                                   XYPlot plot, XYDataset dataset, PlotRenderingInfo info);

    /**
     * Called for each item to be plotted.
     * <p>
     * The {@link XYPlot} can make multiple passes through the dataset,
     * depending on the value returned by the renderer's initialise() method.
     *
     * @param g2  the graphics device.
     * @param state  the renderer state.
     * @param dataArea  the area within which the data is being rendered.
     * @param info  collects drawing info.
     * @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} permitted).
     * @param pass  the pass index.
     */
    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);

    /**
     * Fills a band between two values on the axis.  This can be used to color
     * bands between the grid lines.
     *
     * @param g2  the graphics device.
     * @param plot  the plot.
     * @param axis  the domain axis.
     * @param dataArea  the data area.
     * @param start  the start value.
     * @param end  the end value.
     */
    void fillDomainGridBand(Graphics2D g2, XYPlot plot, ValueAxis axis,
                            Rectangle2D dataArea, double start, double end);

    /**
     * Fills a band between two values on the range axis.  This can be used to
     * color bands between the grid lines.
     *
     * @param g2  the graphics device.
     * @param plot  the plot.
     * @param axis  the range axis.
     * @param dataArea  the data area.
     * @param start  the start value.
     * @param end  the end value.
     */
    void fillRangeGridBand(Graphics2D g2, XYPlot plot, ValueAxis axis,
                           Rectangle2D dataArea, double start, double end);

    /**
     * Draws a grid line against the domain axis.
     *
     * @param g2  the graphics device.
     * @param plot  the plot.
     * @param axis  the value axis.
     * @param dataArea  the area for plotting data.
     * @param value  the value.
     * @param paint  the paint ({@code null} not permitted).
     * @param stroke  the stroke ({@code null} not permitted).
     */
    void drawDomainLine(Graphics2D g2, XYPlot plot, ValueAxis axis,
                        Rectangle2D dataArea, double value, Paint paint, Stroke stroke);

    /**
     * Draws a line perpendicular to the range axis.
     *
     * @param g2  the graphics device.
     * @param plot  the plot.
     * @param axis  the value axis.
     * @param dataArea  the area for plotting data.
     * @param value  the data value.
     * @param paint  the paint ({@code null} not permitted).
     * @param stroke  the stroke ({@code null} not permitted).
     */
    void drawRangeLine(Graphics2D g2, XYPlot plot, ValueAxis axis,
                       Rectangle2D dataArea, double value, Paint paint, Stroke stroke);

    /**
     * Draws the specified {@code marker} against the domain axis.
     *
     * @param g2  the graphics device.
     * @param plot  the plot.
     * @param axis  the value axis.
     * @param marker  the marker.
     * @param dataArea  the axis data area.
     */
    void drawDomainMarker(Graphics2D g2, XYPlot plot, ValueAxis axis,
                          Marker marker, Rectangle2D dataArea);

    /**
     * Draws a horizontal line across the chart to represent a 'range marker'.
     *
     * @param g2  the graphics device.
     * @param plot  the plot.
     * @param axis  the value axis.
     * @param marker  the marker line.
     * @param dataArea  the axis data area.
     */
    void drawRangeMarker(Graphics2D g2, XYPlot plot, ValueAxis axis,
                         Marker marker, Rectangle2D dataArea);

}
