abstractxyitemrenderer.java

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/* ===========================================================
 * 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.]
 *
 * ---------------------------
 * AbstractXYItemRenderer.java
 * ---------------------------
 * (C) Copyright 2002-2005, by Object Refinery Limited and Contributors.
 *
 * Original Author:  David Gilbert (for Object Refinery Limited);
 * Contributor(s):   Richard Atkinson;
 *                   Focus Computer Services Limited;
 *                   Tim Bardzil;
 *
 * $Id: AbstractXYItemRenderer.java,v 1.26 2005/06/01 10:46:27 mungady Exp $
 *
 * Changes:
 * --------
 * 15-Mar-2002 : Version 1 (DG);
 * 09-Apr-2002 : Added a getToolTipGenerator() method reflecting the change in 
 *               the XYItemRenderer interface (DG);
 * 05-Aug-2002 : Added a urlGenerator member variable to support HTML image 
 *               maps (RA);
 * 20-Aug-2002 : Added property change events for the tooltip and URL 
 *               generators (DG);
 * 22-Aug-2002 : Moved property change support into AbstractRenderer class (DG);
 * 23-Sep-2002 : Fixed errors reported by Checkstyle tool (DG);
 * 18-Nov-2002 : Added methods for drawing grid lines (DG);
 * 17-Jan-2003 : Moved plot classes into a separate package (DG);
 * 25-Mar-2003 : Implemented Serializable (DG);
 * 01-May-2003 : Modified initialise() return type and drawItem() method 
 *               signature (DG);
 * 15-May-2003 : Modified to take into account the plot orientation (DG);
 * 21-May-2003 : Added labels to markers (DG);
 * 05-Jun-2003 : Added domain and range grid bands (sponsored by Focus Computer 
 *               Services Ltd) (DG);
 * 27-Jul-2003 : Added getRangeType() to support stacked XY area charts (RA);
 * 31-Jul-2003 : Deprecated all but the default constructor (DG);
 * 13-Aug-2003 : Implemented Cloneable (DG);
 * 16-Sep-2003 : Changed ChartRenderingInfo --> PlotRenderingInfo (DG);
 * 29-Oct-2003 : Added workaround for font alignment in PDF output (DG);
 * 05-Nov-2003 : Fixed marker rendering bug (833623) (DG);
 * 11-Feb-2004 : Updated labelling for markers (DG);
 * 25-Feb-2004 : Added updateCrosshairValues() method.  Moved deprecated code 
 *               to bottom of source file (DG);
 * 16-Apr-2004 : Added support for IntervalMarker in drawRangeMarker() method 
 *               - thanks to Tim Bardzil (DG);
 * 05-May-2004 : Fixed bug (948310) where interval markers extend beyond axis 
 *               range (DG);
 * 03-Jun-2004 : Fixed more bugs in drawing interval markers (DG);
 * 26-Aug-2004 : Added the addEntity() method (DG);
 * 29-Sep-2004 : Added annotation support (with layers) (DG);
 * 30-Sep-2004 : Moved drawRotatedString() from RefineryUtilities --> 
 *               TextUtilities (DG);
 * 06-Oct-2004 : Added findDomainBounds() method and renamed 
 *               getRangeExtent() --> findRangeBounds() (DG);
 * 07-Jan-2005 : Removed deprecated code (DG);
 * 27-Jan-2005 : Modified getLegendItem() to omit hidden series (DG);
 * 24-Feb-2005 : Added getLegendItems() method (DG);
 * 08-Mar-2005 : Fixed positioning of marker labels (DG);
 * 20-Apr-2005 : Renamed XYLabelGenerator --> XYItemLabelGenerator and
 *               added generators for legend labels, tooltips and URLs (DG);
 * 01-Jun-2005 : Handle one dimension of the marker label adjustment 
 *               automatically (DG);
 *
 */

package org.jfree.chart.renderer.xy;

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.Ellipse2D;
import java.awt.geom.Line2D;
import java.awt.geom.Point2D;
import java.awt.geom.Rectangle2D;
import java.io.Serializable;
import java.util.Iterator;
import java.util.List;

import org.jfree.chart.LegendItem;
import org.jfree.chart.LegendItemCollection;
import org.jfree.chart.annotations.XYAnnotation;
import org.jfree.chart.axis.ValueAxis;
import org.jfree.chart.entity.EntityCollection;
import org.jfree.chart.entity.XYItemEntity;
import org.jfree.chart.event.RendererChangeEvent;
import org.jfree.chart.labels.ItemLabelPosition;
import org.jfree.chart.labels.StandardXYSeriesLabelGenerator;
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.DrawingSupplier;
import org.jfree.chart.plot.IntervalMarker;
import org.jfree.chart.plot.Marker;
import org.jfree.chart.plot.Plot;
import org.jfree.chart.plot.PlotOrientation;
import org.jfree.chart.plot.PlotRenderingInfo;
import org.jfree.chart.plot.ValueMarker;
import org.jfree.chart.plot.XYPlot;
import org.jfree.chart.renderer.AbstractRenderer;
import org.jfree.chart.urls.XYURLGenerator;
import org.jfree.data.Range;
import org.jfree.data.general.DatasetUtilities;
import org.jfree.data.xy.XYDataset;
import org.jfree.text.TextUtilities;
import org.jfree.ui.GradientPaintTransformer;
import org.jfree.ui.Layer;
import org.jfree.ui.LengthAdjustmentType;
import org.jfree.ui.RectangleAnchor;
import org.jfree.ui.RectangleInsets;
import org.jfree.util.ObjectList;
import org.jfree.util.ObjectUtilities;
import org.jfree.util.PublicCloneable;

/**
 * A base class that can be used to create new {@link XYItemRenderer} 
 * implementations.
 */
public abstract class AbstractXYItemRenderer extends AbstractRenderer
                                             implements XYItemRenderer,
                                                        Cloneable,
                                                        Serializable {

    /** For serialization. */
    private static final long serialVersionUID = 8019124836026607990L;
    
    /** The plot. */
    private XYPlot plot;
    
    /** The item label generator for ALL series. */
    private XYItemLabelGenerator itemLabelGenerator;

    /** A list of item label generators (one per series). */
    private ObjectList itemLabelGeneratorList;

    /** The base item label generator. */
    private XYItemLabelGenerator baseItemLabelGenerator;

    /** The tool tip generator for ALL series. */
    private XYToolTipGenerator toolTipGenerator;

    /** A list of tool tip generators (one per series). */
    private ObjectList toolTipGeneratorList;

    /** The base tool tip generator. */
    private XYToolTipGenerator baseToolTipGenerator;

    /** The URL text generator. */
    private XYURLGenerator urlGenerator;
    
    /** 
     * Annotations to be drawn in the background layer ('underneath' the data 
     * items). 
     */
    private List backgroundAnnotations;
    
    /** 
     * Annotations to be drawn in the foreground layer ('on top' of the data 
     * items). 
     */
    private List foregroundAnnotations;
    
    private int defaultEntityRadius;
    
    private XYSeriesLabelGenerator legendItemLabelGenerator;
    
    private XYSeriesLabelGenerator legendItemToolTipGenerator;
    
    private XYSeriesLabelGenerator legendItemURLGenerator;

    /**
     * Creates a renderer where the tooltip generator and the URL generator are
     * both <code>null</code>.
     */
    protected AbstractXYItemRenderer() {
        this.itemLabelGenerator = null;
        this.itemLabelGeneratorList = new ObjectList();
        this.toolTipGenerator = null;
        this.toolTipGeneratorList = new ObjectList();
        this.urlGenerator = null;
        this.backgroundAnnotations = new java.util.ArrayList();
        this.foregroundAnnotations = new java.util.ArrayList();
        this.defaultEntityRadius = 3;
        this.legendItemLabelGenerator 
            = new StandardXYSeriesLabelGenerator("{0}");
    }

    /**
     * Returns the number of passes through the data that the renderer requires
     * in order to draw the chart.  Most charts will require a single pass, but 
     * some require two passes.
     *
     * @return The pass count.
     */
    public int getPassCount() {
        return 1;
    }

    /**
     * Returns the plot that the renderer is assigned to.
     *
     * @return The plot.
     */
    public XYPlot getPlot() {
        return this.plot;
    }

    /**
     * Sets the plot that the renderer is assigned to.
     *
     * @param plot  the plot.
     */
    public void setPlot(XYPlot plot) {
        this.plot = plot;
    }

    /**
     * Initialises the renderer and returns a state object that should be 
     * passed to all subsequent calls to the drawItem() method.
     * <P>
     * 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 data  the data.
     * @param info  an optional info collection object to return data back to 
     *              the caller.
     *
     * @return The renderer state (never <code>null</code>).
     */
    public XYItemRendererState initialise(Graphics2D g2,
                                          Rectangle2D dataArea,
                                          XYPlot plot,
                                          XYDataset data,
                                          PlotRenderingInfo info) {

        XYItemRendererState state = new XYItemRendererState(info);
        return state;

    }

    // ITEM LABEL GENERATOR

    /**
     * Returns the label generator for a data item.  This implementation simply 
     * passes control to the {@link #getSeriesItemLabelGenerator(int)} method.  
     * If, for some reason, you want a different generator for individual 
     * items, you can override this method.
     *
     * @param row  the row index (zero based).
     * @param column  the column index (zero based).
     *
     * @return The generator (possibly <code>null</code>).
     */
    public XYItemLabelGenerator getItemLabelGenerator(int row, int column) {
        return getSeriesItemLabelGenerator(row);
    }

    /**
     * Returns the item label generator for a series.
     *
     * @param series  the series index (zero based).
     *
     * @return The generator (possibly <code>null</code>).
     */
    public XYItemLabelGenerator getSeriesItemLabelGenerator(int series) {

        // return the generator for ALL series, if there is one...
        if (this.itemLabelGenerator != null) {
            return this.itemLabelGenerator;
        }

        // otherwise look up the generator table
        XYItemLabelGenerator generator
            = (XYItemLabelGenerator) this.itemLabelGeneratorList.get(series);
        if (generator == null) {
            generator = this.baseItemLabelGenerator;
        }
        return generator;

    }

    /**
     * Sets the item label generator for ALL series and sends a 
     * {@link RendererChangeEvent} to all registered listeners.
     *
     * @param generator  the generator (<code>null</code> permitted).
     */
    public void setItemLabelGenerator(XYItemLabelGenerator generator) {
        this.itemLabelGenerator = generator;
        notifyListeners(new RendererChangeEvent(this));
    }

    /**
     * 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</code> permitted).
     */
    public void setSeriesItemLabelGenerator(int series, 
                                            XYItemLabelGenerator generator) {
        this.itemLabelGeneratorList.set(series, generator);
        notifyListeners(new RendererChangeEvent(this));
    }

    /**
     * Returns the base item label generator.
     *
     * @return The generator (possibly <code>null</code>).
     */
    public XYItemLabelGenerator getBaseItemLabelGenerator() {
        return this.baseItemLabelGenerator;
    }

    /**
     * Sets the base item label generator and sends a 
     * {@link RendererChangeEvent} to all registered listeners.
     *
     * @param generator  the generator (<code>null</code> permitted).
     */
    public void setBaseItemLabelGenerator(XYItemLabelGenerator generator) {
        this.baseItemLabelGenerator = generator;
        notifyListeners(new RendererChangeEvent(this));
    }

    // TOOL TIP GENERATOR

    /**
     * Returns the tool tip generator for a data item.  This implementation 
     * simply passes control to the getSeriesToolTipGenerator() method.  If, 
     * for some reason, you want a different generator for individual items, 
     * you can override this method.
     *