chartpanel.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.]
 *
 * ---------------
 * ChartPanel.java
 * ---------------
 * (C) Copyright 2000-2005, by Object Refinery Limited and Contributors.
 *
 * Original Author:  David Gilbert (for Object Refinery Limited);
 * Contributor(s):   Andrzej Porebski;
 *                   S???ren Caspersen;
 *                   Jonathan Nash;
 *                   Hans-Jurgen Greiner;
 *                   Andreas Schneider;
 *                   Daniel van Enckevort;
 *                   David M O'Donnell;
 *                   Arnaud Lelievre;
 *                   Matthias Rose;
 *                   Onno vd Akker;
 *
 * $Id: ChartPanel.java,v 1.20 2005/06/02 08:36:23 mungady Exp $
 *
 * Changes (from 28-Jun-2001)
 * --------------------------
 * 28-Jun-2001 : Integrated buffering code contributed by S???ren 
 *               Caspersen (DG);
 * 18-Sep-2001 : Updated header and fixed DOS encoding problem (DG);
 * 22-Nov-2001 : Added scaling to improve display of charts in small sizes (DG);
 * 26-Nov-2001 : Added property editing, saving and printing (DG);
 * 11-Dec-2001 : Transferred saveChartAsPNG method to new ChartUtilities 
 *               class (DG);
 * 13-Dec-2001 : Added tooltips (DG);
 * 16-Jan-2002 : Added an optional crosshair, based on the implementation by 
 *               Jonathan Nash. Renamed the tooltips class (DG);
 * 23-Jan-2002 : Implemented zooming based on code by Hans-Jurgen Greiner (DG);
 * 05-Feb-2002 : Improved tooltips setup.  Renamed method attemptSaveAs() 
 *               --> doSaveAs() and made it public rather than private (DG);
 * 28-Mar-2002 : Added a new constructor (DG);
 * 09-Apr-2002 : Changed initialisation of tooltip generation, as suggested by 
 *               Hans-Jurgen Greiner (DG);
 * 27-May-2002 : New interactive zooming methods based on code by Hans-Jurgen 
 *               Greiner. Renamed JFreeChartPanel --> ChartPanel, moved 
 *               constants to ChartPanelConstants interface (DG);
 * 31-May-2002 : Fixed a bug with interactive zooming and added a way to 
 *               control if the zoom rectangle is filled in or drawn as an 
 *               outline. A mouse drag gesture towards the top left now causes 
 *               an autoRangeBoth() and is a way to undo zooms (AS);
 * 11-Jun-2002 : Reinstated handleClick method call in mouseClicked() to get 
 *               crosshairs working again (DG);
 * 13-Jun-2002 : Added check for null popup menu in mouseDragged method (DG);
 * 18-Jun-2002 : Added get/set methods for minimum and maximum chart 
 *               dimensions (DG);
 * 25-Jun-2002 : Removed redundant code (DG);
 * 27-Aug-2002 : Added get/set methods for popup menu (DG);
 * 26-Sep-2002 : Fixed errors reported by Checkstyle (DG);
 * 22-Oct-2002 : Added translation methods for screen <--> Java2D, contributed
 *               by Daniel van Enckevort (DG);
 * 05-Nov-2002 : Added a chart reference to the ChartMouseEvent class (DG);
 * 22-Nov-2002 : Added test in zoom method for inverted axes, supplied by 
 *               David M O'Donnell (DG);
 * 14-Jan-2003 : Implemented ChartProgressListener interface (DG);
 * 14-Feb-2003 : Removed deprecated setGenerateTooltips method (DG);
 * 12-Mar-2003 : Added option to enforce filename extension (see bug id 
 *               643173) (DG);
 * 08-Sep-2003 : Added internationalization via use of properties 
 *               resourceBundle (RFE 690236) (AL);
 * 18-Sep-2003 : Added getScaleX() and getScaleY() methods (protected) as 
 *               requested by Irv Thomae (DG);
 * 12-Nov-2003 : Added zooming support for the FastScatterPlot class (DG);
 * 24-Nov-2003 : Minor Javadoc updates (DG);
 * 04-Dec-2003 : Added anchor point for crosshair calculation (DG);
 * 17-Jan-2004 : Added new methods to set tooltip delays to be used in this 
 *               chart panel. Refer to patch 877565 (MR);
 * 02-Feb-2004 : Fixed bug in zooming trigger and added zoomTriggerDistance 
 *               attribute (DG);
 * 08-Apr-2004 : Changed getScaleX() and getScaleY() from protected to 
 *               public (DG);
 * 15-Apr-2004 : Added zoomOutFactor and zoomInFactor (DG);
 * 21-Apr-2004 : Fixed zooming bug in mouseReleased() method (DG);
 * 13-Jul-2004 : Added check for null chart (DG);
 * 04-Oct-2004 : Renamed ShapeUtils --> ShapeUtilities (DG); 
 * 11-Nov-2004 : Moved constants back in from ChartPanelConstants (DG);
 * 12-Nov-2004 : Modified zooming mechanism to support zooming within 
 *               subplots (DG);
 * 26-Jan-2005 : Fixed mouse zooming for horizontal category plots (DG);
 * 11-Apr-2005 : Added getFillZoomRectangle() method, renamed 
 *               setHorizontalZoom() --> setDomainZoomable(), 
 *               setVerticalZoom() --> setRangeZoomable(), added 
 *               isDomainZoomable() and isRangeZoomable(), added 
 *               getHorizontalAxisTrace() and getVerticalAxisTrace(),
 *               renamed autoRangeBoth() --> restoreAutoBounds(),
 *               autoRangeHorizontal() --> restoreAutoDomainBounds(),
 *               autoRangeVertical() --> restoreAutoRangeBounds() (DG);
 * 12-Apr-2005 : Removed working areas, added getAnchorPoint() method,
 *               added protected accessors for tracelines (DG);
 * 18-Apr-2005 : Made constants final (DG);
 * 26-Apr-2005 : Removed LOGGER (DG);
 * 01-Jun-2005 : Fixed zooming for combined plots - see bug report 
 *               1212039, fix thanks to Onno vd Akker (DG);
 */

package org.jfree.chart;

import java.awt.AWTEvent;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.Insets;
import java.awt.Point;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.awt.event.MouseMotionListener;
import java.awt.geom.AffineTransform;
import java.awt.geom.Line2D;
import java.awt.geom.Point2D;
import java.awt.geom.Rectangle2D;
import java.awt.print.PageFormat;
import java.awt.print.Printable;
import java.awt.print.PrinterException;
import java.awt.print.PrinterJob;
import java.io.File;
import java.io.IOException;
import java.io.Serializable;
import java.util.Iterator;
import java.util.List;
import java.util.ResourceBundle;

import javax.swing.JFileChooser;
import javax.swing.JMenu;
import javax.swing.JMenuItem;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JPopupMenu;
import javax.swing.ToolTipManager;

import org.jfree.chart.entity.ChartEntity;
import org.jfree.chart.entity.EntityCollection;
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.plot.Plot;
import org.jfree.chart.plot.PlotOrientation;
import org.jfree.chart.plot.PlotRenderingInfo;
import org.jfree.chart.plot.ValueAxisPlot;
import org.jfree.chart.plot.Zoomable;
import org.jfree.chart.ui.ChartPropertyEditPanel;
import org.jfree.ui.ExtensionFileFilter;

/**
 * A Swing GUI component for displaying a {@link JFreeChart} object.
 * <P>
 * The panel registers with the chart to receive notification of changes to any
 * component of the chart.  The chart is redrawn automatically whenever this 
 * notification is received.
 */
public class ChartPanel extends JPanel 
                        implements ChartChangeListener,
                                   ChartProgressListener,
                                   ActionListener,
                                   MouseListener,
                                   MouseMotionListener,
                                   Printable,
                                   Serializable {

    /** For serialization. */
    private static final long serialVersionUID = 6046366297214274674L;
    
    /** Default setting for buffer usage. */
    public static final boolean DEFAULT_BUFFER_USED = false;

    /** The default panel width. */
    public static final int DEFAULT_WIDTH = 680;

    /** The default panel height. */
    public static final int DEFAULT_HEIGHT = 420;

    /** The default limit below which chart scaling kicks in. */
    public static final int DEFAULT_MINIMUM_DRAW_WIDTH = 300;

    /** The default limit below which chart scaling kicks in. */
    public static final int DEFAULT_MINIMUM_DRAW_HEIGHT = 200;

    /** The default limit below which chart scaling kicks in. */
    public static final int DEFAULT_MAXIMUM_DRAW_WIDTH = 800;

    /** The default limit below which chart scaling kicks in. */
    public static final int DEFAULT_MAXIMUM_DRAW_HEIGHT = 600;

    /** The minimum size required to perform a zoom on a rectangle */
    public static final int DEFAULT_ZOOM_TRIGGER_DISTANCE = 10;

    /** Properties action command. */
    public static final String PROPERTIES_COMMAND = "PROPERTIES";

    /** Save action command. */
    public static final String SAVE_COMMAND = "SAVE";

    /** Print action command. */
    public static final String PRINT_COMMAND = "PRINT";

    /** Zoom in (both axes) action command. */
    public static final String ZOOM_IN_BOTH_COMMAND = "ZOOM_IN_BOTH";

    /** Zoom in (domain axis only) action command. */
    public static final String ZOOM_IN_DOMAIN_COMMAND = "ZOOM_IN_DOMAIN";

    /** Zoom in (range axis only) action command. */
    public static final String ZOOM_IN_RANGE_COMMAND = "ZOOM_IN_RANGE";

    /** Zoom out (both axes) action command. */
    public static final String ZOOM_OUT_BOTH_COMMAND = "ZOOM_OUT_BOTH";

    /** Zoom out (domain axis only) action command. */
    public static final String ZOOM_OUT_DOMAIN_COMMAND = "ZOOM_DOMAIN_BOTH";

    /** Zoom out (range axis only) action command. */
    public static final String ZOOM_OUT_RANGE_COMMAND = "ZOOM_RANGE_BOTH";

    /** Zoom reset (both axes) action command. */
    public static final String ZOOM_RESET_BOTH_COMMAND = "ZOOM_RESET_BOTH";

    /** Zoom reset (domain axis only) action command. */
    public static final String ZOOM_RESET_DOMAIN_COMMAND = "ZOOM_RESET_DOMAIN";

    /** Zoom reset (range axis only) action command. */
    public static final String ZOOM_RESET_RANGE_COMMAND = "ZOOM_RESET_RANGE";

    /** The chart that is displayed in the panel. */
    private JFreeChart chart;

    /** Storage for registered (chart) mouse listeners. */
    private List chartMouseListeners;

    /** A flag that controls whether or not the off-screen buffer is used. */
    private boolean useBuffer;

    /** A flag that indicates that the buffer should be refreshed. */
    private boolean refreshBuffer;

    /** A buffer for the rendered chart. */
    private Image chartBuffer;

    /** The height of the chart buffer. */
    private int chartBufferHeight;

    /** The width of the chart buffer. */
    private int chartBufferWidth;

    /** 
     * The minimum width for drawing a chart (uses scaling for smaller widths). 
     */
    private int minimumDrawWidth;

    /** 
     * The minimum height for drawing a chart (uses scaling for smaller 
     * heights). 
     */
    private int minimumDrawHeight;

    /** 
     * The maximum width for drawing a chart (uses scaling for bigger 
     * widths). 
     */
    private int maximumDrawWidth;

    /** 
     * The maximum height for drawing a chart (uses scaling for bigger 
     * heights). 
     */
    private int maximumDrawHeight;

    /** The popup menu for the frame. */
    private JPopupMenu popup;

    /** The drawing info collected the last time the chart was drawn. */
    private ChartRenderingInfo info;
    
    /** The chart anchor point. */
    private Point2D anchor;

    /** The scale factor used to draw the chart. */
    private double scaleX;

    /** The scale factor used to draw the chart. */
    private double scaleY;

    /** The plot orientation. */
    private PlotOrientation orientation = PlotOrientation.VERTICAL;
    
    /** A flag that controls whether or not domain zooming is enabled. */
    private boolean domainZoomable = false;

    /** A flag that controls whether or not range zooming is enabled. */
    private boolean rangeZoomable = false;

    /** 
     * The zoom rectangle starting point (selected by the user with a mouse 
     * click).  This is a point on the screen, not the chart (which may have
     * been scaled up or down to fit the panel).  
     */
    private Point zoomPoint = null;

    /** The zoom rectangle (selected by the user with the mouse). */
    private transient Rectangle2D zoomRectangle = null;

    /** Controls if the zoom rectangle is drawn as an outline or filled. */
    private boolean fillZoomRectangle = false;

    /** The minimum distance required to drag the mouse to trigger a zoom. */
    private int zoomTriggerDistance;
    
    /** A flag that controls whether or not horizontal tracing is enabled. */
    private boolean horizontalAxisTrace = false;

    /** A flag that controls whether or not vertical tracing is enabled. */
    private boolean verticalAxisTrace = false;

    /** A vertical trace line. */
    private transient Line2D verticalTraceLine;

    /** A horizontal trace line. */
    private transient Line2D horizontalTraceLine;

    /** Menu item for zooming in on a chart (both axes). */
    private JMenuItem zoomInBothMenuItem;

    /** Menu item for zooming in on a chart (domain axis). */
    private JMenuItem zoomInDomainMenuItem;

    /** Menu item for zooming in on a chart (range axis). */
    private JMenuItem zoomInRangeMenuItem;

    /** Menu item for zooming out on a chart. */
    private JMenuItem zoomOutBothMenuItem;

    /** Menu item for zooming out on a chart (domain axis). */
    private JMenuItem zoomOutDomainMenuItem;

    /** Menu item for zooming out on a chart (range axis). */
    private JMenuItem zoomOutRangeMenuItem;

    /** Menu item for resetting the zoom (both axes). */
    private JMenuItem zoomResetBothMenuItem;

    /** Menu item for resetting the zoom (domain axis only). */
    private JMenuItem zoomResetDomainMenuItem;

    /** Menu item for resetting the zoom (range axis only). */
    private JMenuItem zoomResetRangeMenuItem;