jfreechart.java

Web图形化的Java库

/* ======================================
 * JFreeChart : a free Java chart library
 * ======================================
 *
 * Project Info:  http://www.jfree.org/jfreechart/index.html
 * Project Lead:  David Gilbert ([e-mail]);
 *
 * (C) Copyright 2000-2003, by Object Refinery Limited and Contributors.
 *
 * 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.
 *
 * ---------------
 * JFreeChart.java
 * ---------------
 * (C) Copyright 2000-2003, by Object Refinery Limited and Contributors.
 *
 * Original Author:  David Gilbert (for Object Refinery Limited);
 * Contributor(s):   Andrzej Porebski;
 *                   David Li;
 *                   Wolfgang Irler;
 *                   Christian W. Zuckschwerdt;
 *                   Klaus Rheinwald;
 *
 * $Id: JFreeChart.java,v 1.15 2003/09/11 08:32:36 mungady Exp $
 *
 * Changes (from 20-Jun-2001)
 * --------------------------
 * 20-Jun-2001 : Modifications submitted by Andrzej Porebski for legend placement;
 * 21-Jun-2001 : Removed JFreeChart parameter from Plot constructors (DG);
 * 22-Jun-2001 : Multiple titles added (original code by David Berry, with reworkings by DG);
 * 18-Sep-2001 : Updated header (DG);
 * 15-Oct-2001 : Moved data source classes into new package com.jrefinery.data.* (DG);
 * 18-Oct-2001 : New factory method for creating VerticalXYBarChart (DG);
 * 19-Oct-2001 : Moved series paint and stroke methods to the Plot class (DG);
 *               Moved static chart creation methods to new ChartFactory class (DG);
 * 22-Oct-2001 : Renamed DataSource.java --> Dataset.java etc. (DG);
 *               Fixed bug where chart isn't registered with the dataset (DG);
 * 07-Nov-2001 : Fixed bug where null title in constructor causes exception (DG);
 *               Tidied up event notification code (DG);
 * 17-Nov-2001 : Added getLegendItemCount() method (DG);
 * 21-Nov-2001 : Set clipping in draw method to ensure that nothing gets drawn outside the chart
 *               area (DG);
 * 11-Dec-2001 : Added the createBufferedImage(...) method, taken from the JFreeChartServletDemo
 *               class (DG);
 * 13-Dec-2001 : Added tooltips (DG);
 * 16-Jan-2002 : Added handleClick(...) method (DG);
 * 22-Jan-2002 : Fixed bug correlating legend labels with pie data (DG);
 * 05-Feb-2002 : Removed redundant tooltips code (DG);
 * 19-Feb-2002 : Added accessor methods for the backgroundImage and backgroundImageAlpha
 *               attributes (DG);
 * 21-Feb-2002 : Added static fields for INFO, COPYRIGHT, LICENCE, CONTRIBUTORS and LIBRARIES.
 *               These can be used to display information about JFreeChart (DG);
 * 06-Mar-2002 : Moved constants to JFreeChartConstants interface (DG);
 * 18-Apr-2002 : PieDataset is no longer sorted (oldman);
 * 23-Apr-2002 : Moved dataset to the Plot class (DG);
 * 13-Jun-2002 : Added an extra draw(...) method (DG);
 * 25-Jun-2002 : Implemented the Drawable interface and removed redundant imports (DG);
 * 26-Jun-2002 : Added another createBufferedImage(...) method (DG);
 * 18-Sep-2002 : Fixed issues reported by Checkstyle (DG);
 * 23-Sep-2002 : Added new contributor (DG);
 * 28-Oct-2002 : Created main title and subtitle list to replace existing title list (DG);
 * 08-Jan-2003 : Added contributor (DG);
 * 17-Jan-2003 : Added new constructor (DG);
 * 22-Jan-2003 : Added ChartColor class by Cameron Riley, and background image alignment code by
 *               Christian W. Zuckschwerdt (DG);
 * 11-Feb-2003 : Added flag to allow suppression of chart change events, based on a suggestion by
 *               Klaus Rheinwald (DG);
 * 04-Mar-2003 : Added small fix for suppressed chart change events (see bug id 690865) (DG);
 * 10-Mar-2003 : Added Benoit Xhenseval to contributors (DG);
 * 26-Mar-2003 : Implemented Serializable (DG);
 * 15-Jul-2003 : Added an optional border for the chart (DG);
 */

package org.jfree.chart;

import java.awt.AlphaComposite;
import java.awt.BasicStroke;
import java.awt.Color;
import java.awt.Composite;
import java.awt.Font;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.Paint;
import java.awt.RenderingHints;
import java.awt.Shape;
import java.awt.Stroke;
import java.awt.geom.Rectangle2D;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.Serializable;
import java.net.URL;
import java.util.Arrays;
import java.util.Iterator;
import java.util.List;
import java.util.ResourceBundle;

import javax.swing.ImageIcon;
import javax.swing.event.EventListenerList;

import org.jfree.JCommon;
import org.jfree.chart.event.ChartChangeEvent;
import org.jfree.chart.event.ChartChangeListener;
import org.jfree.chart.event.ChartProgressEvent;
import org.jfree.chart.event.ChartProgressListener;
import org.jfree.chart.event.LegendChangeEvent;
import org.jfree.chart.event.LegendChangeListener;
import org.jfree.chart.event.PlotChangeEvent;
import org.jfree.chart.event.PlotChangeListener;
import org.jfree.chart.event.TitleChangeEvent;
import org.jfree.chart.event.TitleChangeListener;
import org.jfree.chart.plot.CategoryPlot;
import org.jfree.chart.plot.Plot;
import org.jfree.chart.plot.XYPlot;
import org.jfree.io.SerialUtilities;
import org.jfree.ui.Align;
import org.jfree.ui.Drawable;
import org.jfree.ui.about.Contributor;
import org.jfree.ui.about.Library;
import org.jfree.ui.about.Licences;
import org.jfree.ui.about.ProjectInfo;
import org.jfree.util.ObjectUtils;

/**
 * A chart class implemented using the Java 2D APIs.  The current version
 * supports bar charts, line charts, pie charts and xy plots (including time
 * series data).
 * <P>
 * JFreeChart coordinates several objects to achieve its aim of being able to
 * draw a chart on a Java 2D graphics device: a list of {@link AbstractTitle} objects, a
 * {@link Legend}, a {@link Plot} and a {@link org.jfree.data.Dataset} (the plot in
 * turn manages a horizontal axis and a vertical axis).
 * <P>
 * You should use a {@link ChartPanel} to display a chart in a GUI.
 * <P>
 * The {@link ChartFactory} class contains static methods for creating 'ready-made' charts.
 *
 * @see ChartPanel
 * @see ChartFactory
 * @see AbstractTitle
 * @see Legend
 * @see Plot
 *
 * @author David Gilbert
 *
 */
public class JFreeChart implements JFreeChartConstants,
                                   Drawable,
                                   TitleChangeListener,
                                   LegendChangeListener,
                                   PlotChangeListener,
                                   Serializable {

    /** Information about the project. */
    public static final ProjectInfo INFO = new JFreeChartInfo();
    
    /** Rendering hints that will be used for chart drawing. */
    public transient RenderingHints renderingHints;

    /** A flag that controls whether or not the chart border is drawn. */
    private boolean borderVisible;
    
    /** The stroke used to draw the chart border (if visible). */
    private transient Stroke borderStroke;
    
    /** The paint used to draw the chart border (if visible). */
    private transient Paint borderPaint;
    
    /** The chart title (optional). */
    private TextTitle title;

    /** The chart subtitles (zero, one or many). */
    private List subtitles;

    /** The chart legend. */
    private Legend legend;

    /** Draws the visual representation of the data. */
    private Plot plot;

    /** Flag that determines whether or not the chart is drawn with anti-aliasing. */
    private boolean antialias;

    /** Paint used to draw the background of the chart. */
    private transient Paint backgroundPaint;

    /** An optional background image for the chart. */
    private transient Image backgroundImage;  // todo: not serialized yet

    /** The alignment for the background image. */
    private int backgroundImageAlignment = Align.FIT;

    /** The alpha transparency for the background image. */
    private float backgroundImageAlpha = 0.5f;

    /** Storage for registered change listeners. */
    private transient EventListenerList changeListeners;

    /** Storage for registered progress listeners. */
    private transient EventListenerList progressListeners;

    /** A flag that can be used to enable/disable notification of chart change events. */
    private boolean notify;

    /**
     * Constructs a chart.
     * <P>
     * Note that the {@link ChartFactory} class contains static methods that will
     * return a ready-made chart.
     *
     * @param plot  controller of the visual representation of the data.
     */
    public JFreeChart(Plot plot) {

        this(null, // title
             null, // font
             plot,
             false // create legend
             );

    }

    /**
     * Creates a new chart.
     *
     * @param title  the chart title.
     * @param plot  the plot.
     */
    public JFreeChart(String title, Plot plot) {
        this(title, JFreeChart.DEFAULT_TITLE_FONT, plot, true);
    }

    /**
     * Constructs a chart.
     * <P>
     * Note that the ChartFactory class contains static methods that will
     * return a ready-made chart.
     *
     * @param title  the main chart title.
     * @param titleFont  the font for displaying the chart title.
     * @param plot  controller of the visual representation of the data.
     * @param createLegend  a flag indicating whether or not a legend should
     *                      be created for the chart.
     */
    public JFreeChart(String title, Font titleFont, Plot plot, boolean createLegend) {

        // create storage for listeners...
        this.progressListeners = new EventListenerList();
        this.changeListeners = new EventListenerList();
        this.notify = true;  // default is to notify listeners when the chart changes

        this.renderingHints = new RenderingHints(RenderingHints.KEY_ANTIALIASING,
                                                 RenderingHints.VALUE_ANTIALIAS_ON);
        
        this.borderVisible = false;
        this.borderStroke = new BasicStroke(1.0f);
        this.borderPaint = Color.black;
        
        this.plot = plot;
        plot.addChangeListener(this);

        this.subtitles = new java.util.ArrayList();

        // create a legend, if requested...
        if (createLegend) {
            this.legend = Legend.createInstance(this);
            this.legend.addChangeListener(this);
        }

        // add the chart title, if one has been specified...
        if (title != null) {
            if (titleFont == null) {
                titleFont = DEFAULT_TITLE_FONT;
            }
            this.title = new TextTitle(title, titleFont);
            this.title.addChangeListener(this);
        }

        this.antialias = true;
        this.backgroundPaint = DEFAULT_BACKGROUND_PAINT;

        this.backgroundImage = DEFAULT_BACKGROUND_IMAGE;
        this.backgroundImageAlignment = DEFAULT_BACKGROUND_IMAGE_ALIGNMENT;
        this.backgroundImageAlpha = DEFAULT_BACKGROUND_IMAGE_ALPHA;

    }

    /**
     * Returns the collection of rendering hints for the chart.
     * 
     * @return The rendering hints for the chart.
     */
    public RenderingHints getRenderingHints() {
        return this.renderingHints;
    }
    
    /**
     * Sets the rendering hints for the chart.  These will be added (using the Graphics2D 
     * addRenderingHints(...) method) near the start of the JFreeChart.draw(...) method.
     * 
     * @param renderingHints  the rendering hints.
     */
    public void setRenderingHints(RenderingHints renderingHints) {
        this.renderingHints = renderingHints;   
        fireChartChanged();
    }
    
    /**
     * Returns a flag that controls whether or not a border is drawn around the outside of the 
     * chart.
     * 
     * @return A boolean.
     */
    public boolean isBorderVisible() {
        return this.borderVisible;
    }
    
    /**