standardxyitemrenderer.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.]
 *
 * ---------------------------
 * StandardXYItemRenderer.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);
 *                   Jonathan Nash;
 *                   Andreas Schneider;
 *                   Norbert Kiesel (for TBD Networks);
 *                   Christian W. Zuckschwerdt;
 *                   Bill Kelemen;
 *                   Nicolas Brodu (for Astrium and EADS Corporate Research 
 *                   Center);
 *
 * $Id: StandardXYItemRenderer.java,v 1.18 2005/06/02 14:07:01 mungady Exp $
 *
 * Changes:
 * --------
 * 19-Oct-2001 : Version 1, based on code by Mark Watson (DG);
 * 22-Oct-2001 : Renamed DataSource.java --> Dataset.java etc. (DG);
 * 21-Dec-2001 : Added working line instance to improve performance (DG);
 * 22-Jan-2002 : Added code to lock crosshairs to data points.  Based on code 
 *               by Jonathan Nash (DG);
 * 23-Jan-2002 : Added DrawInfo parameter to drawItem() method (DG);
 * 28-Mar-2002 : Added a property change listener mechanism so that the 
 *               renderer no longer needs to be immutable (DG);
 * 02-Apr-2002 : Modified to handle null values (DG);
 * 09-Apr-2002 : Modified draw method to return void.  Removed the translated 
 *               zero from the drawItem method.  Override the initialise() 
 *               method to calculate it (DG);
 * 13-May-2002 : Added code from Andreas Schneider to allow changing 
 *               shapes/colors per item (DG);
 * 24-May-2002 : Incorporated tooltips into chart entities (DG);
 * 25-Jun-2002 : Removed redundant code (DG);
 * 05-Aug-2002 : Incorporated URLs for HTML image maps into chart entities (RA);
 * 08-Aug-2002 : Added discontinuous lines option contributed by 
 *               Norbert Kiesel (DG);
 * 20-Aug-2002 : Added user definable default values to be returned by 
 *               protected methods unless overridden by a subclass (DG);
 * 23-Sep-2002 : Updated for changes in the XYItemRenderer interface (DG);
 * 02-Oct-2002 : Fixed errors reported by Checkstyle (DG);
 * 25-Mar-2003 : Implemented Serializable (DG);
 * 01-May-2003 : Modified drawItem() method signature (DG);
 * 15-May-2003 : Modified to take into account the plot orientation (DG);
 * 29-Jul-2003 : Amended code that doesn't compile with JDK 1.2.2 (DG);
 * 30-Jul-2003 : Modified entity constructor (CZ);
 * 20-Aug-2003 : Implemented Cloneable and PublicCloneable (DG);
 * 24-Aug-2003 : Added null/NaN checks in drawItem (BK);
 * 08-Sep-2003 : Fixed serialization (NB);
 * 16-Sep-2003 : Changed ChartRenderingInfo --> PlotRenderingInfo (DG);
 * 21-Jan-2004 : Override for getLegendItem() method (DG);
 * 27-Jan-2004 : Moved working line into state object (DG);
 * 10-Feb-2004 : Changed drawItem() method to make cut-and-paste overriding 
 *               easier (DG);
 * 25-Feb-2004 : Replaced CrosshairInfo with CrosshairState.  Renamed 
 *               XYToolTipGenerator --> XYItemLabelGenerator (DG);
 * 08-Jun-2004 : Modified to use getX() and getY() methods (DG);
 * 15-Jul-2004 : Switched getX() with getXValue() and getY() with 
 *               getYValue() (DG);
 * 25-Aug-2004 : Created addEntity() method in superclass (DG);
 * 08-Oct-2004 : Added 'gapThresholdType' as suggested by Mike Watts (DG);
 * 11-Nov-2004 : Now uses ShapeUtilities to translate shapes (DG);
 * 23-Feb-2005 : Fixed getLegendItem() method to show lines.  Fixed bug
 *               1077108 (shape not visible for first item in series) (DG);
 * 10-Apr-2005 : Fixed item label positioning with horizontal orientation (DG);
 * 20-Apr-2005 : Use generators for legend tooltips and URLs (DG);
 * 27-Apr-2005 : Use generator for series label in legend (DG);
 *
 */

package org.jfree.chart.renderer.xy;

import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.Paint;
import java.awt.Point;
import java.awt.Shape;
import java.awt.Stroke;
import java.awt.geom.GeneralPath;
import java.awt.geom.Line2D;
import java.awt.geom.Rectangle2D;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.Serializable;

import org.jfree.chart.LegendItem;
import org.jfree.chart.axis.ValueAxis;
import org.jfree.chart.entity.EntityCollection;
import org.jfree.chart.event.RendererChangeEvent;
import org.jfree.chart.labels.XYToolTipGenerator;
import org.jfree.chart.plot.CrosshairState;
import org.jfree.chart.plot.Plot;
import org.jfree.chart.plot.PlotOrientation;
import org.jfree.chart.plot.PlotRenderingInfo;
import org.jfree.chart.plot.XYPlot;
import org.jfree.chart.urls.XYURLGenerator;
import org.jfree.data.xy.XYDataset;
import org.jfree.io.SerialUtilities;
import org.jfree.ui.RectangleEdge;
import org.jfree.util.BooleanList;
import org.jfree.util.BooleanUtilities;
import org.jfree.util.ObjectUtilities;
import org.jfree.util.PublicCloneable;
import org.jfree.util.ShapeUtilities;
import org.jfree.util.UnitType;

/**
 * Standard item renderer for an {@link XYPlot}.  This class can draw (a) 
 * shapes at each point, or (b) lines between points, or (c) both shapes and 
 * lines.
 */
public class StandardXYItemRenderer extends AbstractXYItemRenderer 
                                    implements XYItemRenderer,
                                               Cloneable,
                                               PublicCloneable,
                                               Serializable {

    /** For serialization. */
    private static final long serialVersionUID = -3271351259436865995L;
    
    /** Constant for the type of rendering (shapes only). */
    public static final int SHAPES = 1;

    /** Constant for the type of rendering (lines only). */
    public static final int LINES = 2;

    /** Constant for the type of rendering (shapes and lines). */
    public static final int SHAPES_AND_LINES = SHAPES | LINES;

    /** Constant for the type of rendering (images only). */
    public static final int IMAGES = 4;

    /** Constant for the type of rendering (discontinuous lines). */
    public static final int DISCONTINUOUS = 8;

    /** Constant for the type of rendering (discontinuous lines). */
    public static final int DISCONTINUOUS_LINES = LINES | DISCONTINUOUS;

    /** A flag indicating whether or not shapes are drawn at each XY point. */
    private boolean plotShapes;

    /** A flag indicating whether or not lines are drawn between XY points. */
    private boolean plotLines;

    /** A flag indicating whether or not images are drawn between XY points. */
    private boolean plotImages;

    /** A flag controlling whether or not discontinuous lines are used. */
    private boolean plotDiscontinuous;

    /** Specifies how the gap threshold value is interpreted. */
    private UnitType gapThresholdType = UnitType.RELATIVE;
    
    /** Threshold for deciding when to discontinue a line. */
    private double gapThreshold = 1.0;

    /** A flag that controls whether or not shapes are filled for ALL series. */
    private Boolean shapesFilled;

    /** 
     * A table of flags that control (per series) whether or not shapes are 
     * filled. 
     */
    private BooleanList seriesShapesFilled;

    /** The default value returned by the getShapeFilled() method. */
    private Boolean defaultShapesFilled;

    /** 
     * A flag that controls whether or not each series is drawn as a single 
     * path. 
     */
    private boolean drawSeriesLineAsPath;

    /** 
     * The shape that is used to represent a line in the legend. 
     * This should never be set to <code>null</code>. 
     */
    private transient Shape legendLine;
    
    /**
     * Constructs a new renderer.
     */
    public StandardXYItemRenderer() {
        this(LINES, null);
    }

    /**
     * Constructs a new renderer.
     * <p>
     * To specify the type of renderer, use one of the constants: SHAPES, LINES
     * or SHAPES_AND_LINES.
     *
     * @param type  the type.
     */
    public StandardXYItemRenderer(int type) {
        this(type, null);
    }

    /**
     * Constructs a new renderer.
     * <p>
     * To specify the type of renderer, use one of the constants: SHAPES, LINES
     * or SHAPES_AND_LINES.
     *
     * @param type  the type of renderer.
     * @param toolTipGenerator  the item label generator (<code>null</code> 
     *                          permitted).
     */
    public StandardXYItemRenderer(int type, 
                                  XYToolTipGenerator toolTipGenerator) {
        this(type, toolTipGenerator, null);
    }

    /**
     * Constructs a new renderer.
     * <p>
     * To specify the type of renderer, use one of the constants: SHAPES, LINES 
     * or SHAPES_AND_LINES.
     *
     * @param type  the type of renderer.
     * @param toolTipGenerator  the item label generator (<code>null</code> 
     *                          permitted).
     * @param urlGenerator  the URL generator.
     */
    public StandardXYItemRenderer(int type,
                                  XYToolTipGenerator toolTipGenerator,
                                  XYURLGenerator urlGenerator) {

        super();
        setToolTipGenerator(toolTipGenerator);
        setURLGenerator(urlGenerator);
        if ((type & SHAPES) != 0) {
            this.plotShapes = true;
        }
        if ((type & LINES) != 0) {
            this.plotLines = true;
        }
        if ((type & IMAGES) != 0) {
            this.plotImages = true;
        }
        if ((type & DISCONTINUOUS) != 0) {
            this.plotDiscontinuous = true;
        }

        this.shapesFilled = null;
        this.seriesShapesFilled = new BooleanList();
        this.defaultShapesFilled = Boolean.TRUE;
        this.legendLine = new Line2D.Double(-7.0, 0.0, 7.0, 0.0);
        this.drawSeriesLineAsPath = false;
    }

    /**
     * Returns true if shapes are being plotted by the renderer.
     *
     * @return <code>true</code> if shapes are being plotted by the renderer.
     */
    public boolean getDefaultShapesVisible() {
        return this.plotShapes;
    }

    /**
     * Sets the flag that controls whether or not a shape is plotted at each 
     * data point.
     *
     * @param flag  the flag.
     */
    public void setDefaultShapesVisible(boolean flag) {
        if (this.plotShapes != flag) {
            this.plotShapes = flag;
            notifyListeners(new RendererChangeEvent(this));
        }
    }

    /**
     * Returns true if shapes are being plotted by the renderer.
     *
     * @return <code>true</code> if shapes are being plotted by the renderer.
     */
    public boolean getPlotShapes() {
        return this.plotShapes;
    }

    /**
     * Sets the flag that controls whether or not a shape is plotted at each 
     * data point.
     *
     * @param flag  the flag.
     */
    public void setPlotShapes(boolean flag) {
        if (this.plotShapes != flag) {
            this.plotShapes = flag;
            notifyListeners(new RendererChangeEvent(this));
        }
    }

    // SHAPES FILLED

    /**
     * Returns the flag used to control whether or not the shape for an item is
     * filled.
     * <p>
     * The default implementation passes control to the 
     * <code>getSeriesShapesFilled</code> method.  You can override this method 
     * if you require different behaviour.
     *
     * @param series  the series index (zero-based).
     * @param item  the item index (zero-based).
     *
     * @return A boolean.
     */
    public boolean getItemShapeFilled(int series, int item) {
        return getSeriesShapesFilled(series);
    }

    /**
     * Returns the flag used to control whether or not the shapes for a series
     * are filled.