/* ===========================================================
 * JFreeChart : a free chart library for the Java(tm) platform
 * ===========================================================
 *
 * (C) Copyright 2000-2006, 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., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, 
 * USA.  
 *
 * [Java is a trademark or registered trademark of Sun Microsystems, Inc. 
 * in the United States and other countries.]
 *
 * -------------------
 * ChartComposite.java
 * -------------------
 * (C) Copyright 2006, by Henry Proudhon and Contributors.
 *
 * Original Author:  Henry Proudhon (henry.proudhon AT insa-lyon.fr);
 * Contributor(s):   David Gilbert (for Object Refinery Limited);
 *
 * Changes
 * -------
 * 19-Jun-2006 : New class (HP);
 * 06-Nov-2006 : Added accessor methods for zoomInFactor and zoomOutFactor (DG);
 * 28-Nov-2006 : Added support for trace lines (HP);
 * 30-Nov-2006 : Improved zoom box handling (HP);
 * 06-Dec-2006 : Added (simplified) tool tip support (HP);
 * 11-Dec-2006 : Fixed popup menu location by fgiust, bug 1612770 (HP);
 * 31-Jan-2007 : Fixed some issues with the trace lines, fixed cross hair not being drawn,
 *               added getter and setter methods for the trace lines (HP); 
 */

package org.jfree.experimental.chart.swt;

import java.awt.Graphics;
import java.awt.Point;
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.util.ResourceBundle;

import javax.swing.event.EventListenerList;

import org.eclipse.swt.SWT;
import org.eclipse.swt.events.MouseEvent;
import org.eclipse.swt.events.PaintEvent;
import org.eclipse.swt.events.PaintListener;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.events.SelectionListener;
import org.eclipse.swt.graphics.GC;
import org.eclipse.swt.graphics.Rectangle;
import org.eclipse.swt.layout.FillLayout;
import org.eclipse.swt.widgets.Canvas;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Event;
import org.eclipse.swt.widgets.FileDialog;
import org.eclipse.swt.widgets.Listener;
import org.eclipse.swt.widgets.Menu;
import org.eclipse.swt.widgets.MenuItem;
import org.eclipse.swt.widgets.MessageBox;
import org.jfree.chart.ChartMouseEvent;
import org.jfree.chart.ChartMouseListener;
import org.jfree.chart.ChartRenderingInfo;
import org.jfree.chart.ChartUtilities;
import org.jfree.chart.JFreeChart;
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.experimental.chart.swt.editor.SWTChartEditor;
import org.jfree.experimental.swt.SWTGraphics2D;
import org.jfree.experimental.swt.SWTUtils;

/**
 * A SWT GUI composite for displaying a {@link JFreeChart} object.
 * <p>
 * The composite listens to 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 ChartComposite extends Composite implements ChartChangeListener,
                                                         ChartProgressListener,
                                                         SelectionListener,
                                                         Printable
{
    /** 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 = 1000;

    /** The default limit below which chart scaling kicks in. */
    public static final int DEFAULT_MAXIMUM_DRAW_HEIGHT = 1000;

    /** 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. */
    public JFreeChart chart;

    /** The canvas to display the chart */
    private Canvas canvas;
    
    /** Storage for registered (chart) mouse listeners. */
    private EventListenerList 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 flag that indicates that the tooltips should be displayed. */
    private boolean displayToolTips;

    /** A buffer for the rendered chart. */
    private org.eclipse.swt.graphics.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 Menu 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 org.eclipse.swt.graphics.Point zoomPoint = null;

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

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

    /** 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 int verticalTraceLineX;

    /** A horizontal trace line. */
    private transient int horizontalTraceLineY;

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

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

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

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

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

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

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

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

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

    /** A flag that controls whether or not file extensions are enforced. */
    private boolean enforceFileExtensions;

    /** The factor used to zoom in on an axis range. */
    private double zoomInFactor = 0.5;
    
    /** The factor used to zoom out on an axis range. */
    private double zoomOutFactor = 2.0;
    
    /** The resourceBundle for the localization. */
    protected static ResourceBundle localizationResources 
        = ResourceBundle.getBundle("org.jfree.chart.LocalizationBundle");

    /**
     * Create a new chart composite with a default FillLayout. 
     * This way, when drawn, the chart will fill all the space.
     * @param comp The parent.
     * @param style The style of the composite.
     */
    public ChartComposite(Composite comp, int style) {
        this(comp, 
                style,
                null,
                DEFAULT_WIDTH,
                DEFAULT_HEIGHT,
                DEFAULT_MINIMUM_DRAW_WIDTH,
                DEFAULT_MINIMUM_DRAW_HEIGHT,
                DEFAULT_MAXIMUM_DRAW_WIDTH,
                DEFAULT_MAXIMUM_DRAW_HEIGHT,
                DEFAULT_BUFFER_USED,
                true,  // properties
                true,  // save
                true,  // print
                true,  // zoom
                true   // tooltips
        );
    }

    /**
     * Constructs a panel that displays the specified chart.
     *
     * @param comp The parent.
     * @param style The style of the composite.
     * @param chart  the chart.
     */
    public ChartComposite(Composite comp, int style, JFreeChart chart) {
        this( 
                comp, 
                style,
                chart,
                DEFAULT_WIDTH,
                DEFAULT_HEIGHT,
                DEFAULT_MINIMUM_DRAW_WIDTH,
                DEFAULT_MINIMUM_DRAW_HEIGHT,
                DEFAULT_MAXIMUM_DRAW_WIDTH,
                DEFAULT_MAXIMUM_DRAW_HEIGHT,
                DEFAULT_BUFFER_USED,
                true,  // properties
                true,  // save
                true,  // print
                true,  // zoom
                true   // tooltips
        );
    }

    /**
     * Constructs a panel containing a chart.
     *
     * @param comp The parent.
     * @param style The style of the composite.
     * @param chart  the chart.
     * @param useBuffer  a flag controlling whether or not an off-screen buffer
     *                   is used.
     */
    public ChartComposite(Composite comp, int style, JFreeChart chart, 
            boolean useBuffer) {
        
        this(comp, style, chart,
                DEFAULT_WIDTH,
                DEFAULT_HEIGHT,
                DEFAULT_MINIMUM_DRAW_WIDTH,
                DEFAULT_MINIMUM_DRAW_HEIGHT,
                DEFAULT_MAXIMUM_DRAW_WIDTH,
                DEFAULT_MAXIMUM_DRAW_HEIGHT,
                useBuffer,
                true,  // properties
                true,  // save
                true,  // print
                true,  // zoom
                true   // tooltips
                );
    }
    
    /**
     * Constructs a JFreeChart panel.
     *
     * @param comp The parent.
     * @param style The style of the composite.
     * @param chart  the chart.
     * @param properties  a flag indicating whether or not the chart property
     *                    editor should be available via the popup menu.
     * @param save  a flag indicating whether or not save options should be
     *              available via the popup menu.
     * @param print  a flag indicating whether or not the print option
     *               should be available via the popup menu.
     * @param zoom  a flag indicating whether or not zoom options should
     *              be added to the popup menu.
     * @param tooltips  a flag indicating whether or not tooltips should be
     *                  enabled for the chart.
     */
    public ChartComposite(
            Composite comp, 
            int style,
            JFreeChart chart,
            boolean properties,
            boolean save,
            boolean print,
            boolean zoom,
            boolean tooltips) {
        this(
                comp,
                style,
                chart,
                DEFAULT_WIDTH,
                DEFAULT_HEIGHT,
                DEFAULT_MINIMUM_DRAW_WIDTH,
                DEFAULT_MINIMUM_DRAW_HEIGHT,
                DEFAULT_MAXIMUM_DRAW_WIDTH,
                DEFAULT_MAXIMUM_DRAW_HEIGHT,
                DEFAULT_BUFFER_USED,
                properties,
                save,
                print,
                zoom,
                tooltips
                );
    }

    /**
     * Constructs a JFreeChart panel.
     *
     * @param comp The parent.
     * @param style The style of the composite.
     * @param jfreechart  the chart.
     * @param width  the preferred width of the panel.
     * @param height  the preferred height of the panel.
     * @param minimumDrawW  the minimum drawing width.
     * @param minimumDrawH  the minimum drawing height.
     * @param maximumDrawW  the maximum drawing width.
     * @param maximumDrawH  the maximum drawing height.
     * @param usingBuffer  a flag that indicates whether to use the off-screen
     *                   buffer to improve performance (at the expense of 
     *                   memory).
     * @param properties  a flag indicating whether or not the chart property
     *                    editor should be available via the popup menu.
     * @param save  a flag indicating whether or not save options should be
     *              available via the popup menu.
     * @param print  a flag indicating whether or not the print option
     *               should be available via the popup menu.
     * @param zoom  a flag indicating whether or not zoom options should be 
     *              added to the popup menu.
     * @param tooltips  a flag indicating whether or not tooltips should be 
     *                  enabled for the chart.
     */
    public ChartComposite(Composite comp, 
            int style,
            JFreeChart jfreechart,
            int width,
            int height,
            int minimumDrawW,
            int minimumDrawH,
            int maximumDrawW,
            int maximumDrawH,
            boolean usingBuffer,
            boolean properties,
            boolean save,
            boolean print,
            boolean zoom,
            boolean tooltips) {
        super(comp, style);
        this.setChart(jfreechart);
        this.chartMouseListeners = new EventListenerList();
        this.setLayout(new FillLayout());
        this.info = new ChartRenderingInfo();
        this.useBuffer = usingBuffer;
        this.refreshBuffer = false;
        this.minimumDrawWidth = minimumDrawW;
        this.minimumDrawHeight = minimumDrawH;
        this.maximumDrawWidth = maximumDrawW;
        this.maximumDrawHeight = maximumDrawH;
        this.zoomTriggerDistance = DEFAULT_ZOOM_TRIGGER_DISTANCE;
        this.setDisplayToolTips(tooltips);
        canvas = new Canvas(this, SWT.NO_BACKGROUND);
        canvas.addPaintListener(new PaintListener() {
            public void paintControl(PaintEvent e) {
                SWTGraphics2D sg2 = new SWTGraphics2D(e.gc);
                
                // first determine the size of the chart rendering area...
                // no insets for SWT, try getClientArea
                //System.out.println( canvas.getClientArea() );
                Rectangle available = getBounds();

                // work out if scaling is required...
                boolean scale = false;
                int drawWidth = available.width;
                int drawHeight = available.height;
                if ( drawWidth == 0.0 || drawHeight == 0.0 ) return;
                scaleX = 1.0;
                scaleY = 1.0;
                if (drawWidth < minimumDrawWidth) {
                    scaleX = (double) drawWidth / minimumDrawWidth;
                    drawWidth = minimumDrawWidth;
                    scale = true;
                }
                else if (drawWidth > maximumDrawWidth) {
                    scaleX = (double) drawWidth / maximumDrawWidth;
                    drawWidth = maximumDrawWidth;
                    scale = true;
                }
                if ( drawHeight < minimumDrawHeight ) {
                    scaleY = ( double ) drawHeight / minimumDrawHeight;
                    drawHeight = minimumDrawHeight;
                    scale = true;
                }
                else if (drawHeight > maximumDrawHeight) {
                    scaleY = (double) drawHeight / maximumDrawHeight;
                    drawHeight = maximumDrawHeight;
                    scale = true;
                }
                // are we using the chart buffer?
                if (useBuffer) {
                    //SwtGraphics2D sg2 = new SwtGraphics2D( e.gc );
                    chartBuffer = (org.eclipse.swt.graphics.Image) 
                            canvas.getData("double-buffer-image");
                    // do we need to fill the buffer?
                    if ( chartBuffer == null
                      || chartBufferWidth != available.width
                      || chartBufferHeight != available.height ) {
                        chartBufferWidth = available.width;
                        chartBufferHeight = available.height;
                        if (chartBuffer != null) {
                            chartBuffer.dispose();
                        }
                        chartBuffer = new org.eclipse.swt.graphics.Image( 
                                  getDisplay(), chartBufferWidth, 
                                  chartBufferHeight);
                        refreshBuffer = true;
                    }

                    // do we need to redraw the buffer?
                    if (refreshBuffer) {
                        if (scale) {
                            sg2.scale(scaleX, scaleY);
                        }
                        // Performs the actual drawing here ...
                        GC gci = new GC(chartBuffer);
                        SWTGraphics2D sg2d = new SWTGraphics2D(gci);
                        chart.draw(sg2d, new Rectangle2D.Double(0, 0, 
                                chartBufferWidth, chartBufferHeight), getAnchor(), info);
                        canvas.setData("double-buffer-image", chartBuffer);
                        gci.dispose();
                        refreshBuffer = false;
                    }
                    
                    // zap the buffer onto the canvas...
                    sg2.drawImage(chartBuffer, 0, 0);
                }
                // or redrawing the chart every time...
                else
                {
                    chart.draw(sg2, new Rectangle2D.Double(0, 0, 
                        getBounds().width, getBounds().height), getAnchor(), info);
                }
                Rectangle area = getScreenDataArea();
                //TODO see if we need to apply some line color and style to the axis traces
                if (verticalAxisTrace && area.x < verticalTraceLineX 
                        && area.x + area.width > verticalTraceLineX) 
                    e.gc.drawLine(verticalTraceLineX, area.y, verticalTraceLineX, area.y + area.height);
                if (horizontalAxisTrace && area.y < horizontalTraceLineY 
                        && area.y + area.height > horizontalTraceLineY) 
                    e.gc.drawLine(area.x, horizontalTraceLineY, area.x + area.width, horizontalTraceLineY);
                verticalTraceLineX = 0;
                horizontalTraceLineY = 0;
                if (zoomRectangle != null) e.gc.drawRectangle(zoomRectangle);
            }
        } );
        if (chart != null) {
            chart.addChangeListener(this);
            Plot plot = chart.getPlot();
            this.domainZoomable = false;
            this.rangeZoomable = false;
            if (plot instanceof Zoomable) {
                Zoomable z = (Zoomable) plot;
                this.domainZoomable = z.isDomainZoomable();
                this.rangeZoomable = z.isRangeZoomable();
                this.orientation = z.getOrientation();
            }
        }

        // set up popup menu...
        this.popup = null;
        if (properties || save || print || zoom)
            this.popup = createPopupMenu(properties, save, print, zoom);

        Listener listener = new Listener() {
            public void handleEvent (Event event) {
                switch (event.type) {
                    case SWT.MouseDown:
                        Rectangle scaledDataArea = getScreenDataArea(event.x, event.y);
                        zoomPoint = getPointInRectangle(event.x, event.y, scaledDataArea);
                        Rectangle insets = getClientArea();
                        int x = (int) ((event.x - insets.x) / scaleX);
                        int y = (int) ((event.y - insets.y) / scaleY);

                        anchor = new Point2D.Double(x, y);
                        chart.setNotify(true);  // force a redraw 
                        canvas.redraw();
                        // new entity code...
                        Object[] listeners = chartMouseListeners.getListeners(
                                ChartMouseListener.class);
                        if (listeners.length == 0) {
                            return;
                        }

                        ChartEntity entity = null;
                        if (info != null) 
                        {
                            EntityCollection entities 
                                    = info.getEntityCollection();
                            if (entities != null) {
                                entity = entities.getEntity(x, y);
                            }
                        }
                        java.awt.event.MouseEvent mouseEvent = SWTUtils.toAwtMouseEvent(event); 
                        ChartMouseEvent chartEvent = new ChartMouseEvent(getChart(), mouseEvent, entity);
                        for (int i = listeners.length - 1; i >= 0; i -= 1) {
                            ((ChartMouseListener) 
                                    listeners[i]).chartMouseClicked(chartEvent);
                        }
                        break;
                    case SWT.MouseMove:
                        // handle axis trace
                        if ( horizontalAxisTrace || verticalAxisTrace ) 
                        {
                            horizontalTraceLineY = event.y;
                            verticalTraceLineX = event.x;
                            canvas.redraw();
                        }
                        // handle tool tips in a simple way
                        if (displayToolTips) {                            
                            String s = getToolTipText(new MouseEvent(event));
                            if (s!=null && !s.equals(canvas.getToolTipText())) 
                                canvas.setToolTipText(s);
                        }
                        // handle zoom box
                        if (zoomPoint == null) {
                            return;
                        }
                        scaledDataArea = getScreenDataArea(zoomPoint.x, zoomPoint.y);
                        org.eclipse.swt.graphics.Point movingPoint 
                            = getPointInRectangle(event.x, event.y, scaledDataArea);
                        // handle zoom
                        boolean hZoom = false;
                        boolean vZoom = false;
                        if (orientation == PlotOrientation.HORIZONTAL) {
                            hZoom = rangeZoomable;
                            vZoom = domainZoomable;
                        }
                        else {
                            hZoom = domainZoomable;              
                            vZoom = rangeZoomable;
                        }
                        if (hZoom && vZoom) 
                        {
                            // selected rectangle shouldn't extend outside the data area...
                            zoomRectangle = new Rectangle(zoomPoint.x, zoomPoint.y, 
                                    movingPoint.x - zoomPoint.x, movingPoint.y - zoomPoint.y);                            
                        }
                        else if (hZoom) 
                        {
                            zoomRectangle = new Rectangle(zoomPoint.x, scaledDataArea.y,
                                    movingPoint.x - zoomPoint.x, scaledDataArea.height);
                        }
                        else if (vZoom) 
                        {
                            zoomRectangle = new Rectangle(
                                    scaledDataArea.x, zoomPoint.y,
                                    scaledDataArea.width, event.y - zoomPoint.y);
                        }
                        canvas.redraw();
                        break;
                    case SWT.MouseUp:
                        if (zoomRectangle == null) {
                            Rectangle screenDataArea = getScreenDataArea(event.x, event.y);
                            if (screenDataArea != null) {
                                zoomPoint = getPointInRectangle(event.x, event.y, screenDataArea);
                            }
                            if (popup != null && event.button == 3) {
                                org.eclipse.swt.graphics.Point pt = canvas.toDisplay(event.x, event.y);
                                displayPopupMenu(pt.x, pt.y);
                            }
                        }
                        else
                        {
                            hZoom = false;
                            vZoom = false;
                            if (orientation == PlotOrientation.HORIZONTAL) {
                                hZoom = rangeZoomable;
                                vZoom = domainZoomable;
                            }
                            else {
                                hZoom = domainZoomable;              
                                vZoom = rangeZoomable;
                            }
                            boolean zoomTrigger1 = hZoom 
                                    && Math.abs(zoomRectangle.width) 
                                    >= zoomTriggerDistance;
                            boolean zoomTrigger2 = vZoom 
                                    && Math.abs(zoomRectangle.height) 
                                    >= zoomTriggerDistance;
                            if (zoomTrigger1 || zoomTrigger2) {
                                // if the box has been drawn backwards, restore the auto bounds
                                if ((hZoom && (zoomRectangle.x + zoomRectangle.width < zoomPoint.x)) 
                                        || (vZoom && (zoomRectangle.y + zoomRectangle.height < zoomPoint.y))) 
                                    restoreAutoBounds();
                                else zoom(zoomRectangle);
                                canvas.redraw();
                            }
                        }
                        zoomPoint = null;
                        zoomRectangle = null;
                        break;
                    default:
                        zoomPoint = null;
                        zoomRectangle = null;
                }
            }
        };
        canvas.addListener(SWT.MouseDown, listener);
        canvas.addListener(SWT.MouseMove, listener);
        canvas.addListener(SWT.MouseUp, listener);
        
        this.enforceFileExtensions = true;
    }
        
    /**
     * Returns the X scale factor for the chart.  This will be 1.0 if no 
     * scaling has been used.
     * 
     * @return The scale factor.
     */
    public double getScaleX() {
        return this.scaleX;
    }
    
    /**
     * Returns the Y scale factory for the chart.  This will be 1.0 if no 
     * scaling has been used.
     * 
     * @return The scale factor.
     */
    public double getScaleY() {
        return this.scaleY;
    }
    
    /**
     * Returns the anchor point.
     * 
     * @return The anchor point (possibly <code>null</code>).
     */
    public Point2D getAnchor() {
        return this.anchor;   
    }
    
    /**
     * Sets the anchor point.  This method is provided for the use of 
     * subclasses, not end users.
     * 
     * @param anchor  the anchor point (<code>null</code> permitted).
     */
    protected void setAnchor(Point2D anchor) {
        this.anchor = anchor;   
    }

    /**
     * Returns the chart contained in the panel.
     *
     * @return The chart (possibly <code>null</code>).
     */
    public JFreeChart getChart() {
        return this.chart;
    }

    /**
     * Sets the chart that is displayed in the panel.
     *
     * @param chart  the chart (<code>null</code> permitted).
     */
    public void setChart(JFreeChart chart) {
        // stop listening for changes to the existing chart
        if (this.chart != null) {
            this.chart.removeChangeListener(this);
            this.chart.removeProgressListener(this);
        }

        // add the new chart
        this.chart = chart;
        if (chart != null) {
            this.chart.addChangeListener(this);
            this.chart.addProgressListener(this);
            Plot plot = chart.getPlot();
            this.domainZoomable = false;
            this.rangeZoomable = false;
            if (plot instanceof Zoomable) {
                Zoomable z = (Zoomable) plot;
                this.domainZoomable = z.isDomainZoomable();
                this.rangeZoomable = z.isRangeZoomable();
                this.orientation = z.getOrientation();
            }
        }
        else {
            this.domainZoomable = false;
            this.rangeZoomable = false;
        }
        if (this.useBuffer) {
            this.refreshBuffer = true;
        }
        redraw();
    }

    /**
     * Returns the zoom in factor.
     * 
     * @return The zoom in factor.
     * 
     * @see #setZoomInFactor(double)
     */
    public double getZoomInFactor() {
        return this.zoomInFactor;   
    }
    
    /**
     * Sets the zoom in factor.
     * 
     * @param factor  the factor.
     * 
     * @see #getZoomInFactor()
     */
    public void setZoomInFactor(double factor) {
        this.zoomInFactor = factor;
    }
    
    /**
     * Returns the zoom out factor.
     * 
     * @return The zoom out factor.
     * 
     * @see #setZoomOutFactor(double)
     */
    public double getZoomOutFactor() {
        return this.zoomOutFactor;   
    }
    
    /**
     * Sets the zoom out factor.
     * 
     * @param factor  the factor.
     * 
     * @see #getZoomOutFactor()
     */
    public void setZoomOutFactor(double factor) {
        this.zoomOutFactor = factor;
    }
    
    /**
     * Displays a dialog that allows the user to edit the properties for the
     * current chart.
     */
    private void attemptEditChartProperties() 
    {
        SWTChartEditor editor = new SWTChartEditor(canvas.getDisplay(), this.chart);
            //ChartEditorManager.getChartEditor( canvas.getDisplay(), this.chart );
        editor.open();
    }

    /**
     * Returns <code>true</code> if file extensions should be enforced, and 
     * <code>false</code> otherwise.
     *
     * @return The flag.
     */
    public boolean isEnforceFileExtensions() {
        return this.enforceFileExtensions;
    }

    /**
     * Sets a flag that controls whether or not file extensions are enforced.
     *
     * @param enforce  the new flag value.
     */
    public void setEnforceFileExtensions(boolean enforce) {
        this.enforceFileExtensions = enforce;
    }

    /**
     * Opens a file chooser and gives the user an opportunity to save the chart
     * in PNG format.
     *
     * @throws IOException if there is an I/O error.
     */
    public void doSaveAs() throws IOException {
        FileDialog fileDialog = new FileDialog(canvas.getShell(), SWT.SAVE);
        String[] extensions = { "*.png" };
        fileDialog.setFilterExtensions(extensions);
        String filename = fileDialog.open();
        if (filename != null) {
            if (isEnforceFileExtensions()) {
                if (!filename.endsWith(".png")) {
                    filename = filename + ".png";
                }
            }
            //TODO replace getSize by getBounds ?
            ChartUtilities.saveChartAsPNG(new File(filename), this.chart, 
                    canvas.getSize().x, canvas.getSize().y);
        }
    }

    /**
     * Returns a point based on (x, y) but constrained to be within the bounds
     * of the given rectangle.  This method could be moved to JCommon.
     * 
     * @param x  the x-coordinate.
     * @param y  the y-coordinate.
     * @param area  the rectangle (<code>null</code> not permitted).
     * 
     * @return A point within the rectangle.
     */
    private org.eclipse.swt.graphics.Point getPointInRectangle(int x, int y, Rectangle area) {
        x = (int) Math.max(area.x, Math.min(x, area.x + area.width));   
        y = (int) Math.max(area.y, Math.min(y, area.y + area.height));
        return new org.eclipse.swt.graphics.Point(x, y);
    }

    /**
     * Zooms in on an anchor point (specified in screen coordinate space).
     *
     * @param x  the x value (in screen coordinates).
     * @param y  the y value (in screen coordinates).
     */
    public void zoomInBoth(double x, double y) {
        zoomInDomain(x, y);
        zoomInRange(x, y);
    }

    /**
     * Decreases the length of the domain axis, centered about the given
     * coordinate on the screen.  The length of the domain axis is reduced
     * by the value of {@link #getZoomInFactor()}.
     *
     * @param x  the x coordinate (in screen coordinates).
     * @param y  the y-coordinate (in screen coordinates).
     */
    public void zoomInDomain(double x, double y) {
        Plot p = this.chart.getPlot();
        if (p instanceof Zoomable) 
        {
            Zoomable plot = (Zoomable) p;
            plot.zoomDomainAxes(this.zoomInFactor, this.info.getPlotInfo(), 
                    translateScreenToJava2D(new Point((int) x, (int) y)));
        }
    }

    /**
     * Decreases the length of the range axis, centered about the given
     * coordinate on the screen.  The length of the range axis is reduced by
     * the value of {@link #getZoomInFactor()}.
     *
     * @param x  the x-coordinate (in screen coordinates).
     * @param y  the y coordinate (in screen coordinates).
     */
    public void zoomInRange(double x, double y) {
        Plot p = this.chart.getPlot();
        if (p instanceof Zoomable) {
            Zoomable z = (Zoomable) p;
            z.zoomRangeAxes(this.zoomInFactor, this.info.getPlotInfo(), 
                    translateScreenToJava2D(new Point((int) x, (int) y)));
        }
    }

    /**
     * Zooms out on an anchor point (specified in screen coordinate space).
     *
     * @param x  the x value (in screen coordinates).
     * @param y  the y value (in screen coordinates).
     */
    public void zoomOutBoth(double x, double y) {
        zoomOutDomain(x, y);
        zoomOutRange(x, y);
    }

    /**
     * Increases the length of the domain axis, centered about the given
     * coordinate on the screen.  The length of the domain axis is increased
     * by the value of {@link #getZoomOutFactor()}.
     *
     * @param x  the x coordinate (in screen coordinates).
     * @param y  the y-coordinate (in screen coordinates).
     */
    public void zoomOutDomain(double x, double y) {
        Plot p = this.chart.getPlot();
        if (p instanceof Zoomable) {
            Zoomable z = (Zoomable) p;
            z.zoomDomainAxes(this.zoomOutFactor, this.info.getPlotInfo(), 
                    translateScreenToJava2D(new Point((int) x, (int) y)));
        }
    }

    /**
     * Increases the length the range axis, centered about the given
     * coordinate on the screen.  The length of the range axis is increased
     * by the value of {@link #getZoomOutFactor()}.
     *
     * @param x  the x coordinate (in screen coordinates).
     * @param y  the y-coordinate (in screen coordinates).
     */
    public void zoomOutRange(double x, double y) {
        Plot p = this.chart.getPlot();
        if (p instanceof Zoomable) {
            Zoomable z = (Zoomable) p;
            z.zoomRangeAxes(this.zoomOutFactor, this.info.getPlotInfo(), 
                    translateScreenToJava2D(new Point((int) x, (int) y)));
        }
    }

    /**
     * Zooms in on a selected region.
     *
     * @param selection  the selected region.
     */
    public void zoom(Rectangle selection) {

        // get the origin of the zoom selection in the Java2D space used for
        // drawing the chart (that is, before any scaling to fit the panel)
        Point2D selectOrigin = translateScreenToJava2D(
                new Point(selection.x, selection.y));
        PlotRenderingInfo plotInfo = this.info.getPlotInfo();
        Rectangle scaledDataArea = getScreenDataArea(
                (int) (selection.x + selection.width)/2, 
                (int) (selection.y + selection.height)/2);
        if ((selection.height > 0) && (selection.width > 0)) {

            double hLower = (selection.x - scaledDataArea.x) 
                / (double) scaledDataArea.width;
            double hUpper = (selection.x + selection.width - scaledDataArea.x) 
                / (double) scaledDataArea.width;
            double vLower = (scaledDataArea.y + scaledDataArea.height - selection.y - selection.height) 
                / (double) scaledDataArea.height;
            double vUpper = (scaledDataArea.y + scaledDataArea.height - selection.y) 
                / (double) scaledDataArea.height;
            Plot p = this.chart.getPlot();
            if (p instanceof Zoomable) {
                Zoomable z = (Zoomable) p;
                if (z.getOrientation() == PlotOrientation.HORIZONTAL) {
                    z.zoomDomainAxes(vLower, vUpper, plotInfo, selectOrigin);
                    z.zoomRangeAxes(hLower, hUpper, plotInfo, selectOrigin);
                }
                else {
                    z.zoomDomainAxes(hLower, hUpper, plotInfo, selectOrigin);
                    z.zoomRangeAxes(vLower, vUpper, plotInfo, selectOrigin);
                }
            }

        }

    }

    /**
     * Receives notification of changes to the chart, and redraws the chart.
     *
     * @param event  details of the chart change event.
     */
    public void chartChanged(ChartChangeEvent event) {
        this.refreshBuffer = true;
        Plot plot = chart.getPlot();
        if (plot instanceof Zoomable) 
        {
            Zoomable z = (Zoomable) plot;
            this.orientation = z.getOrientation();
        }
        this.redraw();
    }

    /**
     * Forces a redraw of the canvas by invoking a new PaintEvent.
     */
    public void forceRedraw() {
        Event ev = new Event();
        ev.gc = new GC(canvas);
        ev.x = 0;
        ev.y = 0;
        ev.width = canvas.getBounds().width;
        ev.height = canvas.getBounds().height;
        ev.count = 0;
        canvas.notifyListeners(SWT.Paint, ev);
    }
    
    /**
     * Receives notification of a chart progress event.
     *
     * @param event  the event.
     */
    public void chartProgress(ChartProgressEvent event) {
        // does nothing - override if necessary
    }

    /**
     * Restores the auto-range calculation on both axes.
     */
    public void restoreAutoBounds() {
        restoreAutoDomainBounds();
        restoreAutoRangeBounds();
    }

    /**
     * Restores the auto-range calculation on the domain axis.
     */
    public void restoreAutoDomainBounds() {
        Plot p = this.chart.getPlot();
        if (p instanceof Zoomable) 
        {
            Zoomable z = (Zoomable) p;
            z.zoomDomainAxes(0.0, this.info.getPlotInfo(), SWTUtils.toAwtPoint(this.zoomPoint));
        }
    }

    /**
     * Restores the auto-range calculation on the range axis.
     */
    public void restoreAutoRangeBounds() {
        Plot p = this.chart.getPlot();
        if (p instanceof ValueAxisPlot)
        {
            Zoomable z = (Zoomable) p;
            z.zoomRangeAxes(0.0, this.info.getPlotInfo(), SWTUtils.toAwtPoint(this.zoomPoint)); 
        }
    }

    /**
     * Applies any scaling that is in effect for the chart drawing to the
     * given rectangle.
     *  
     * @param rect  the rectangle.
     * 
     * @return A new scaled rectangle.
     */
    public Rectangle scale(Rectangle2D rect) {
        Rectangle insets = this.getClientArea();
        int x = (int) Math.round(rect.getX() * getScaleX()) + insets.x;
        int y = (int) Math.round(rect.getY() * this.getScaleY()) + insets.y;
        int w = (int) Math.round(rect.getWidth() * this.getScaleX());
        int h = (int) Math.round(rect.getHeight() * this.getScaleY());
        return new Rectangle(x, y, w, h);
    }

    /**
     * Returns the data area for the chart (the area inside the axes) with the
     * current scaling applied (that is, the area as it appears on screen).
     *
     * @return The scaled data area.
     */
    public Rectangle getScreenDataArea() {
        Rectangle2D dataArea = this.info.getPlotInfo().getDataArea();
        Rectangle clientArea = this.getClientArea();
        int x = (int) (dataArea.getX() * this.scaleX + clientArea.x);
        int y = (int) (dataArea.getY() * this.scaleY + clientArea.y);
        int w = (int) (dataArea.getWidth() * this.scaleX);
        int h = (int) (dataArea.getHeight() * this.scaleY);
        return new Rectangle(x, y, w, h);
    }
    
    /**
     * Returns the data area (the area inside the axes) for the plot or subplot,
     * with the current scaling applied.
     *
     * @param x  the x-coordinate (for subplot selection).
     * @param y  the y-coordinate (for subplot selection).
     * 
     * @return The scaled data area.
     */
    public Rectangle getScreenDataArea(int x, int y) {
        PlotRenderingInfo plotInfo = this.info.getPlotInfo();
        Rectangle result;
        if (plotInfo.getSubplotCount() == 0)
            result = getScreenDataArea();
        else {
            // get the origin of the zoom selection in the Java2D space used for
            // drawing the chart (that is, before any scaling to fit the panel)
            Point2D selectOrigin = translateScreenToJava2D(new Point(x, y));
            int subplotIndex = plotInfo.getSubplotIndex(selectOrigin);
            if (subplotIndex == -1) {
                return null;
            }
            result = scale(plotInfo.getSubplotInfo(subplotIndex).getDataArea());
        }
        return result;
    }

    /**
     * Translates a Java2D point on the chart to a screen location.
     *
     * @param java2DPoint  the Java2D point.
     *
     * @return The screen location.
     */
    public Point translateJava2DToScreen(Point2D java2DPoint) {
        Rectangle insets = this.getClientArea();
        int x = (int) (java2DPoint.getX() * this.scaleX + insets.x);
        int y = (int) (java2DPoint.getY() * this.scaleY + insets.y);
        return new Point(x, y);
    }

    /**
     * Translates a screen location to a Java SWT point.
     *
     * @param screenPoint  the screen location.
     *
     * @return The Java2D coordinates.
     */
    public Point translateScreenToJavaSWT(Point screenPoint) {
        Rectangle insets = this.getClientArea();
        int x = (int) ((screenPoint.x - insets.x) / this.scaleX);
        int y = (int) ((screenPoint.y - insets.y) / this.scaleY);
        return new Point(x, y);
    }

    /**
     * Translates a screen location to a Java2D point.
     *
     * @param screenPoint  the screen location.
     *
     * @return The Java2D coordinates.
     */
    public Point2D translateScreenToJava2D(Point screenPoint) {
        Rectangle insets = this.getClientArea();
        int x = (int) ((screenPoint.x - insets.x) / this.scaleX);
        int y = (int) ((screenPoint.y - insets.y) / this.scaleY);
        return new Point2D.Double(x, y);
    }

    /**
     * Returns the flag that controls whether or not a horizontal axis trace
     * line is drawn over the plot area at the current mouse location.
     * 
     * @return A boolean.
     */
    public boolean getHorizontalAxisTrace() {
        return this.horizontalAxisTrace;    
    }
    
    /**
     * A flag that controls trace lines on the horizontal axis.
     *
     * @param flag  <code>true</code> enables trace lines for the mouse
     *      pointer on the horizontal axis.
     */
    public void setHorizontalAxisTrace(boolean flag) {
        this.horizontalAxisTrace = flag;
    }
    
    /**
     * Returns the flag that controls whether or not a vertical axis trace
     * line is drawn over the plot area at the current mouse location.
     * 
     * @return A boolean.
     */
    public boolean getVerticalAxisTrace() {
        return this.verticalAxisTrace;    
    }
    
    /**
     * A flag that controls trace lines on the vertical axis.
     *
     * @param flag  <code>true</code> enables trace lines for the mouse
     *              pointer on the vertical axis.
     */
    public void setVerticalAxisTrace(boolean flag) {
        this.verticalAxisTrace = flag;
    }

    /**
     * @param displayToolTips the displayToolTips to set
     */
    public void setDisplayToolTips( boolean displayToolTips )
    {
        this.displayToolTips = displayToolTips;
    }

    /**
     * Returns a string for the tooltip.
     *
     * @param e  the mouse event.
     *
     * @return A tool tip or <code>null</code> if no tooltip is available.
     */
    public String getToolTipText(org.eclipse.swt.events.MouseEvent e) {
        String result = null;
        if (this.info != null) {
            EntityCollection entities = this.info.getEntityCollection();
            if (entities != null) {
                Rectangle insets = getBounds();
                ChartEntity entity = entities.getEntity(
                        (int) ((e.x - insets.x) / this.scaleX),
                        (int) ((e.y - insets.y) / this.scaleY));
                if (entity != null) {
                    result = entity.getToolTipText();
                }
            }
        }
        return result;

    }

    /**
     * The idea is to modify the zooming options depending on the type of chart 
     * being displayed by the panel.
     *
     * @param x  horizontal position of the popup.
     * @param y  vertical position of the popup.
     */
    protected void displayPopupMenu(int x, int y) 
    {
        if (this.popup != null) {
            // go through each zoom menu item and decide whether or not to 
            // enable it...
            Plot plot = this.chart.getPlot();
            boolean isDomainZoomable = false;
            boolean isRangeZoomable = false;
            if (plot instanceof Zoomable) 
            {
                Zoomable z = (Zoomable) plot;
                isDomainZoomable = z.isDomainZoomable();
                isRangeZoomable = z.isRangeZoomable();
            }
            if (this.zoomInDomainMenuItem != null) {
                this.zoomInDomainMenuItem.setEnabled(isDomainZoomable);
            }
            if (this.zoomOutDomainMenuItem != null) {
                this.zoomOutDomainMenuItem.setEnabled(isDomainZoomable);
            } 
            if (this.zoomResetDomainMenuItem != null) {
                this.zoomResetDomainMenuItem.setEnabled(isDomainZoomable);
            }

            if (this.zoomInRangeMenuItem != null) {
                this.zoomInRangeMenuItem.setEnabled(isRangeZoomable);
            }
            if (this.zoomOutRangeMenuItem != null) {
                this.zoomOutRangeMenuItem.setEnabled(isRangeZoomable);
            }

            if (this.zoomResetRangeMenuItem != null) {
                this.zoomResetRangeMenuItem.setEnabled(isRangeZoomable);
            }

            if (this.zoomInBothMenuItem != null) {
                this.zoomInBothMenuItem.setEnabled(
                    isDomainZoomable & isRangeZoomable
                );
            }
            if (this.zoomOutBothMenuItem != null) {
                this.zoomOutBothMenuItem.setEnabled(
                    isDomainZoomable & isRangeZoomable
                );
            }
            if (this.zoomResetBothMenuItem != null) {
                this.zoomResetBothMenuItem.setEnabled(
                    isDomainZoomable & isRangeZoomable
                );
            }

            this.popup.setLocation(x, y);
            this.popup.setVisible(true);
        }

    }

    /**
     * Creates a print job for the chart.
     */
    public void createChartPrintJob() {
        //FIXME try to replace swing print stuff by swt
        PrinterJob job = PrinterJob.getPrinterJob();
        PageFormat pf = job.defaultPage();
        PageFormat pf2 = job.pageDialog(pf);
        if (pf2 != pf) {
            job.setPrintable(this, pf2);
            if (job.printDialog()) {
                try {
                    job.print();
                }
                catch (PrinterException e) {
                    MessageBox messageBox = new MessageBox( 
                            canvas.getShell(), SWT.OK | SWT.ICON_ERROR );
                    messageBox.setMessage( e.getMessage() );
                    messageBox.open();
                }
            }
        }
    }

    /**
     * Creates a popup menu for the canvas.
     *
     * @param properties  include a menu item for the chart property editor.
     * @param save  include a menu item for saving the chart.
     * @param print  include a menu item for printing the chart.
     * @param zoom  include menu items for zooming.
     *
     * @return The popup menu.
     */
    protected Menu createPopupMenu(boolean properties, boolean save, 
            boolean print, boolean zoom) {
        
        Menu result = new Menu(this);
        boolean separator = false;

        if ( properties ) {
            MenuItem propertiesItem = new MenuItem(result, SWT.PUSH);
            propertiesItem.setText(localizationResources.getString(
                    "Properties..."));
            propertiesItem.setData(PROPERTIES_COMMAND);
            propertiesItem.addSelectionListener(this);
            separator = true;
        }
        if (save) 
        {
            if (separator) {
                new MenuItem(result, SWT.SEPARATOR);
                separator = false;
            }
            MenuItem saveItem = new MenuItem(result, SWT.NONE);
            saveItem.setText(localizationResources.getString("Save_as..."));
            saveItem.setData(SAVE_COMMAND);
            saveItem.addSelectionListener(this);
            separator = true;
        }
        if (print) {
            if (separator) {
                new MenuItem(result, SWT.SEPARATOR);
                separator = false;
            }
            MenuItem printItem = new MenuItem(result, SWT.NONE);
            printItem.setText(localizationResources.getString("Print..."));
            printItem.setData(PRINT_COMMAND);
            printItem.addSelectionListener(this);
            separator = true;
        }
        if (zoom) {
            if (separator) {
                new MenuItem(result, SWT.SEPARATOR);
                separator = false;
            }

            Menu zoomInMenu = new Menu(result);
            MenuItem zoomInMenuItem = new MenuItem(result, SWT.CASCADE);
            zoomInMenuItem.setText(localizationResources.getString("Zoom_In"));
            zoomInMenuItem.setMenu(zoomInMenu);

            this.zoomInBothMenuItem = new MenuItem(zoomInMenu, SWT.PUSH);
            this.zoomInBothMenuItem.setText(localizationResources.getString(
                    "All_Axes"));
            this.zoomInBothMenuItem.setData(ZOOM_IN_BOTH_COMMAND);
            this.zoomInBothMenuItem.addSelectionListener(this);

            new MenuItem(zoomInMenu, SWT.SEPARATOR);

            this.zoomInDomainMenuItem = new MenuItem(zoomInMenu, SWT.PUSH);
            this.zoomInDomainMenuItem.setText(localizationResources.getString(
                    "Domain_Axis" ) );
            this.zoomInDomainMenuItem.setData(ZOOM_IN_DOMAIN_COMMAND);
            this.zoomInDomainMenuItem.addSelectionListener(this);

            this.zoomInRangeMenuItem = new MenuItem(zoomInMenu, SWT.PUSH);
            this.zoomInRangeMenuItem.setText(localizationResources.getString(
                    "Range_Axis" ) );
            this.zoomInRangeMenuItem.setData(ZOOM_IN_RANGE_COMMAND);
            this.zoomInRangeMenuItem.addSelectionListener(this);

            Menu zoomOutMenu = new Menu( result );
            MenuItem zoomOutMenuItem = new MenuItem(result, SWT.CASCADE);
            zoomOutMenuItem.setText(localizationResources.getString(
                    "Zoom_Out"));
            zoomOutMenuItem.setMenu(zoomOutMenu);

            this.zoomOutBothMenuItem = new MenuItem(zoomOutMenu, SWT.PUSH);
            this.zoomOutBothMenuItem.setText(localizationResources.getString(
                    "All_Axes"));
            this.zoomOutBothMenuItem.setData(ZOOM_OUT_BOTH_COMMAND);
            this.zoomOutBothMenuItem.addSelectionListener(this);
            
            new MenuItem(zoomOutMenu, SWT.SEPARATOR);

            this.zoomOutDomainMenuItem = new MenuItem(zoomOutMenu, SWT.PUSH);
            this.zoomOutDomainMenuItem.setText(localizationResources.getString(
                    "Domain_Axis"));
            this.zoomOutDomainMenuItem.setData(ZOOM_OUT_DOMAIN_COMMAND);
            this.zoomOutDomainMenuItem.addSelectionListener( this );

            this.zoomOutRangeMenuItem = new MenuItem(zoomOutMenu, SWT.PUSH);
            this.zoomOutRangeMenuItem.setText(
                    localizationResources.getString("Range_Axis"));
            this.zoomOutRangeMenuItem.setData(ZOOM_OUT_RANGE_COMMAND);
            this.zoomOutRangeMenuItem.addSelectionListener(this);

            Menu autoRangeMenu = new Menu(result);
            MenuItem autoRangeMenuItem = new MenuItem(result, SWT.CASCADE);
            autoRangeMenuItem.setText(localizationResources.getString(
                    "Auto_Range"));
            autoRangeMenuItem.setMenu(autoRangeMenu);

            this.zoomResetBothMenuItem = new MenuItem(autoRangeMenu, SWT.PUSH);
            this.zoomResetBothMenuItem.setText(localizationResources.getString(
                    "All_Axes"));
            this.zoomResetBothMenuItem.setData(ZOOM_RESET_BOTH_COMMAND);
            this.zoomResetBothMenuItem.addSelectionListener(this);
            
            new MenuItem(autoRangeMenu, SWT.SEPARATOR);

            this.zoomResetDomainMenuItem = new MenuItem(autoRangeMenu, 
                    SWT.PUSH);
            this.zoomResetDomainMenuItem.setText(
                    localizationResources.getString("Domain_Axis"));
            this.zoomResetDomainMenuItem.setData(ZOOM_RESET_DOMAIN_COMMAND);
            this.zoomResetDomainMenuItem.addSelectionListener(this);
               
            this.zoomResetRangeMenuItem = new MenuItem(autoRangeMenu, SWT.PUSH);
            this.zoomResetRangeMenuItem.setText(
                    localizationResources.getString("Range_Axis"));
            this.zoomResetRangeMenuItem.setData(ZOOM_RESET_RANGE_COMMAND);
            this.zoomResetRangeMenuItem.addSelectionListener(this);
        }
        
        return result;
    }

    /**
     * Handles action events generated by the popup menu.
     *
     * @see org.eclipse.swt.events.SelectionListener#widgetDefaultSelected(
     * org.eclipse.swt.events.SelectionEvent)
     */
    public void widgetDefaultSelected(SelectionEvent e) {
        // TODO Auto-generated method stub
        
    }

    /**
     * Handles action events generated by the popup menu.
     *
     * @see org.eclipse.swt.events.SelectionListener#widgetSelected(
     * org.eclipse.swt.events.SelectionEvent)
     */
    public void widgetSelected(SelectionEvent e) {
        String command = (String) ((MenuItem) e.getSource()).getData();
        if (command.equals(PROPERTIES_COMMAND)) {
            attemptEditChartProperties();
        }
        else if (command.equals(SAVE_COMMAND)) {
            try {
                doSaveAs();
            }
            catch (IOException ex) {
                ex.printStackTrace();
            }
        }
        else if (command.equals(PRINT_COMMAND)) {
            createChartPrintJob();
        }
        /* in the next zoomPoint.x and y replace by e.x and y for now. 
         * this helps to handle the mouse events and besides, 
         * those values are unused AFAIK. */
        else if (command.equals(ZOOM_IN_BOTH_COMMAND)) {
            zoomInBoth( e.x, e.y );
        }
        else if (command.equals(ZOOM_IN_DOMAIN_COMMAND)) {
            zoomInDomain( e.x, e.y );
        }
        else if (command.equals(ZOOM_IN_RANGE_COMMAND)) {
            zoomInRange( e.x, e.y );
        }
        else if (command.equals(ZOOM_OUT_BOTH_COMMAND)) {
            zoomOutBoth( e.x, e.y );
        }
        else if (command.equals(ZOOM_OUT_DOMAIN_COMMAND)) {
            zoomOutDomain( e.x, e.y );
        }
        else if (command.equals(ZOOM_OUT_RANGE_COMMAND)) {
            zoomOutRange( e.x, e.y );
        }
        else if (command.equals(ZOOM_RESET_BOTH_COMMAND)) {
            restoreAutoBounds();
        }
        else if (command.equals(ZOOM_RESET_DOMAIN_COMMAND)) {
            restoreAutoDomainBounds();
        }
        else if (command.equals(ZOOM_RESET_RANGE_COMMAND)) {
            restoreAutoRangeBounds();
        }
        this.forceRedraw();
    }

    public int print(Graphics graphics, PageFormat pageFormat, int pageIndex) 
        throws PrinterException {
        if (pageIndex != 0) {
            return NO_SUCH_PAGE;
        }
        /*
        CairoImage image = new CairoImage( 
                this.getBounds().width, this.getBounds().height );
        Graphics2D g2 = image.createGraphics2D();
        double x = pageFormat.getImageableX();
        double y = pageFormat.getImageableY();
        double w = pageFormat.getImageableWidth();
        double h = pageFormat.getImageableHeight();
        this.chart.draw(
            g2, new Rectangle2D.Double(x, y, w, h), this.anchor, null
        );
        */
        return PAGE_EXISTS;
    }
    
}
