001/* ===========================================================
002 * JFreeChart : a free chart library for the Java(tm) platform
003 * ===========================================================
004 *
005 * (C) Copyright 2000-2008, by Object Refinery Limited and Contributors.
006 *
007 * Project Info:  http://www.jfree.org/jfreechart/index.html
008 *
009 * This library is free software; you can redistribute it and/or modify it
010 * under the terms of the GNU Lesser General Public License as published by
011 * the Free Software Foundation; either version 2.1 of the License, or
012 * (at your option) any later version.
013 *
014 * This library is distributed in the hope that it will be useful, but
015 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
016 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
017 * License for more details.
018 *
019 * You should have received a copy of the GNU Lesser General Public
020 * License along with this library; if not, write to the Free Software
021 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301,
022 * USA.
023 *
024 * [Java is a trademark or registered trademark of Sun Microsystems, Inc.
025 * in the United States and other countries.]
026 *
027 * -------------------------
028 * CombinedDomainXYPlot.java
029 * -------------------------
030 * (C) Copyright 2001-2008, by Bill Kelemen and Contributors.
031 *
032 * Original Author:  Bill Kelemen;
033 * Contributor(s):   David Gilbert (for Object Refinery Limited);
034 *                   Anthony Boulestreau;
035 *                   David Basten;
036 *                   Kevin Frechette (for ISTI);
037 *                   Nicolas Brodu;
038 *                   Petr Kubanek (bug 1606205);
039 *
040 * Changes:
041 * --------
042 * 06-Dec-2001 : Version 1 (BK);
043 * 12-Dec-2001 : Removed unnecessary 'throws' clause from constructor (DG);
044 * 18-Dec-2001 : Added plotArea attribute and get/set methods (BK);
045 * 22-Dec-2001 : Fixed bug in chartChanged with multiple combinations of
046 *               CombinedPlots (BK);
047 * 08-Jan-2002 : Moved to new package com.jrefinery.chart.combination (DG);
048 * 25-Feb-2002 : Updated import statements (DG);
049 * 28-Feb-2002 : Readded "this.plotArea = plotArea" that was deleted from
050 *               draw() method (BK);
051 * 26-Mar-2002 : Added an empty zoom method (this method needs to be written so
052 *               that combined plots will support zooming (DG);
053 * 29-Mar-2002 : Changed the method createCombinedAxis adding the creation of
054 *               OverlaidSymbolicAxis and CombinedSymbolicAxis(AB);
055 * 23-Apr-2002 : Renamed CombinedPlot-->MultiXYPlot, and simplified the
056 *               structure (DG);
057 * 23-May-2002 : Renamed (again) MultiXYPlot-->CombinedXYPlot (DG);
058 * 19-Jun-2002 : Added get/setGap() methods suggested by David Basten (DG);
059 * 25-Jun-2002 : Removed redundant imports (DG);
060 * 16-Jul-2002 : Draws shared axis after subplots (to fix missing gridlines),
061 *               added overrides of 'setSeriesPaint()' and 'setXYItemRenderer()'
062 *               that pass changes down to subplots (KF);
063 * 09-Oct-2002 : Added add(XYPlot) method (DG);
064 * 26-Mar-2003 : Implemented Serializable (DG);
065 * 16-May-2003 : Renamed CombinedXYPlot --> CombinedDomainXYPlot (DG);
066 * 04-Aug-2003 : Removed leftover code that was causing domain axis drawing
067 *               problem (DG);
068 * 08-Aug-2003 : Adjusted totalWeight in remove() method (DG);
069 * 21-Aug-2003 : Implemented Cloneable (DG);
070 * 11-Sep-2003 : Fix cloning support (subplots) (NB);
071 * 15-Sep-2003 : Fixed error in cloning (DG);
072 * 16-Sep-2003 : Changed ChartRenderingInfo --> PlotRenderingInfo (DG);
073 * 17-Sep-2003 : Updated handling of 'clicks' (DG);
074 * 12-Nov-2004 : Implemented the new Zoomable interface (DG);
075 * 25-Nov-2004 : Small update to clone() implementation (DG);
076 * 21-Feb-2005 : The getLegendItems() method now returns the fixed legend
077 *               items if set (DG);
078 * 05-May-2005 : Removed unused draw() method (DG);
079 * ------------- JFREECHART 1.0.x ---------------------------------------------
080 * 23-Aug-2006 : Override setFixedRangeAxisSpace() to update subplots (DG);
081 * 06-Feb-2007 : Fixed bug 1606205, draw shared axis after subplots (DG);
082 * 23-Mar-2007 : Reverted previous patch (bug fix 1606205) (DG);
083 * 17-Apr-2007 : Added null argument checks to findSubplot() (DG);
084 * 27-Nov-2007 : Modified setFixedRangeAxisSpaceForSubplots() so as not to
085 *               trigger change event in subplots (DG);
086 * 28-Jan-2008 : Reset fixed range axis space in subplots for each call to
087 *               draw() (DG);
088 * 27-Mar-2008 : Add documentation for getDataRange() method (DG);
089 * 31-Mar-2008 : Updated getSubplots() to return EMPTY_LIST for null
090 *               subplots, as suggested by Richard West (DG);
091 * 28-Apr-2008 : Fixed zooming problem (see bug 1950037) (DG);
092 * 11-Aug-2008 : Don't store totalWeight of subplots, calculate it as
093 *               required (DG);
094 *
095 */
096
097package org.jfree.chart.plot;
098
099import java.awt.Graphics2D;
100import java.awt.geom.Point2D;
101import java.awt.geom.Rectangle2D;
102import java.util.Collections;
103import java.util.Iterator;
104import java.util.List;
105
106import org.jfree.chart.LegendItemCollection;
107import org.jfree.chart.axis.AxisSpace;
108import org.jfree.chart.axis.AxisState;
109import org.jfree.chart.axis.NumberAxis;
110import org.jfree.chart.axis.ValueAxis;
111import org.jfree.chart.event.PlotChangeEvent;
112import org.jfree.chart.event.PlotChangeListener;
113import org.jfree.chart.renderer.xy.XYItemRenderer;
114import org.jfree.data.Range;
115import org.jfree.ui.RectangleEdge;
116import org.jfree.ui.RectangleInsets;
117import org.jfree.util.ObjectUtilities;
118
119/**
120 * An extension of {@link XYPlot} that contains multiple subplots that share a
121 * common domain axis.
122 */
123public class CombinedDomainXYPlot extends XYPlot
124        implements PlotChangeListener {
125
126    /** For serialization. */
127    private static final long serialVersionUID = -7765545541261907383L;
128
129    /** Storage for the subplot references. */
130    private List subplots;
131
132    /** The gap between subplots. */
133    private double gap = 5.0;
134
135    /** Temporary storage for the subplot areas. */
136    private transient Rectangle2D[] subplotAreas;
137    // TODO:  the subplot areas needs to be moved out of the plot into the plot
138    //        state
139
140    /**
141     * Default constructor.
142     */
143    public CombinedDomainXYPlot() {
144        this(new NumberAxis());
145    }
146
147    /**
148     * Creates a new combined plot that shares a domain axis among multiple
149     * subplots.
150     *
151     * @param domainAxis  the shared axis.
152     */
153    public CombinedDomainXYPlot(ValueAxis domainAxis) {
154
155        super(
156            null,        // no data in the parent plot
157            domainAxis,
158            null,        // no range axis
159            null         // no rendereer
160        );
161
162        this.subplots = new java.util.ArrayList();
163
164    }
165
166    /**
167     * Returns a string describing the type of plot.
168     *
169     * @return The type of plot.
170     */
171    public String getPlotType() {
172        return "Combined_Domain_XYPlot";
173    }
174
175    /**
176     * Sets the orientation for the plot (also changes the orientation for all
177     * the subplots to match).
178     *
179     * @param orientation  the orientation (<code>null</code> not allowed).
180     */
181    public void setOrientation(PlotOrientation orientation) {
182
183        super.setOrientation(orientation);
184        Iterator iterator = this.subplots.iterator();
185        while (iterator.hasNext()) {
186            XYPlot plot = (XYPlot) iterator.next();
187            plot.setOrientation(orientation);
188        }
189
190    }
191
192    /**
193     * Returns a range representing the extent of the data values in this plot
194     * (obtained from the subplots) that will be rendered against the specified
195     * axis.  NOTE: This method is intended for internal JFreeChart use, and
196     * is public only so that code in the axis classes can call it.  Since
197     * only the domain axis is shared between subplots, the JFreeChart code
198     * will only call this method for the domain values (although this is not
199     * checked/enforced).
200     *
201     * @param axis  the axis.
202     *
203     * @return The range (possibly <code>null</code>).
204     */
205    public Range getDataRange(ValueAxis axis) {
206        Range result = null;
207        if (this.subplots != null) {
208            Iterator iterator = this.subplots.iterator();
209            while (iterator.hasNext()) {
210                XYPlot subplot = (XYPlot) iterator.next();
211                result = Range.combine(result, subplot.getDataRange(axis));
212            }
213        }
214        return result;
215    }
216
217    /**
218     * Returns the gap between subplots, measured in Java2D units.
219     *
220     * @return The gap (in Java2D units).
221     */
222    public double getGap() {
223        return this.gap;
224    }
225
226    /**
227     * Sets the amount of space between subplots and sends a
228     * {@link PlotChangeEvent} to all registered listeners.
229     *
230     * @param gap  the gap between subplots (in Java2D units).
231     */
232    public void setGap(double gap) {
233        this.gap = gap;
234        fireChangeEvent();
235    }
236
237    /**
238     * Adds a subplot (with a default 'weight' of 1) and sends a
239     * {@link PlotChangeEvent} to all registered listeners.
240     * <P>
241     * The domain axis for the subplot will be set to <code>null</code>.  You
242     * must ensure that the subplot has a non-null range axis.
243     *
244     * @param subplot  the subplot (<code>null</code> not permitted).
245     */
246    public void add(XYPlot subplot) {
247        // defer argument checking
248        add(subplot, 1);
249    }
250
251    /**
252     * Adds a subplot with the specified weight and sends a
253     * {@link PlotChangeEvent} to all registered listeners.  The weight
254     * determines how much space is allocated to the subplot relative to all
255     * the other subplots.
256     * <P>
257     * The domain axis for the subplot will be set to <code>null</code>.  You
258     * must ensure that the subplot has a non-null range axis.
259     *
260     * @param subplot  the subplot (<code>null</code> not permitted).
261     * @param weight  the weight (must be >= 1).
262     */
263    public void add(XYPlot subplot, int weight) {
264
265        if (subplot == null) {
266            throw new IllegalArgumentException("Null 'subplot' argument.");
267        }
268        if (weight <= 0) {
269            throw new IllegalArgumentException("Require weight >= 1.");
270        }
271
272        // store the plot and its weight
273        subplot.setParent(this);
274        subplot.setWeight(weight);
275        subplot.setInsets(new RectangleInsets(0.0, 0.0, 0.0, 0.0), false);
276        subplot.setDomainAxis(null);
277        subplot.addChangeListener(this);
278        this.subplots.add(subplot);
279
280        ValueAxis axis = getDomainAxis();
281        if (axis != null) {
282            axis.configure();
283        }
284        fireChangeEvent();
285    }
286
287    /**
288     * Removes a subplot from the combined chart and sends a
289     * {@link PlotChangeEvent} to all registered listeners.
290     *
291     * @param subplot  the subplot (<code>null</code> not permitted).
292     */
293    public void remove(XYPlot subplot) {
294        if (subplot == null) {
295            throw new IllegalArgumentException(" Null 'subplot' argument.");
296        }
297        int position = -1;
298        int size = this.subplots.size();
299        int i = 0;
300        while (position == -1 && i < size) {
301            if (this.subplots.get(i) == subplot) {
302                position = i;
303            }
304            i++;
305        }
306        if (position != -1) {
307            this.subplots.remove(position);
308            subplot.setParent(null);
309            subplot.removeChangeListener(this);
310            ValueAxis domain = getDomainAxis();
311            if (domain != null) {
312                domain.configure();
313            }
314            fireChangeEvent();
315        }
316    }
317
318    /**
319     * Returns the list of subplots.  The returned list may be empty, but is
320     * never <code>null</code>.
321     *
322     * @return An unmodifiable list of subplots.
323     */
324    public List getSubplots() {
325        if (this.subplots != null) {
326            return Collections.unmodifiableList(this.subplots);
327        }
328        else {
329            return Collections.EMPTY_LIST;
330        }
331    }
332
333    /**
334     * Calculates the axis space required.
335     *
336     * @param g2  the graphics device.
337     * @param plotArea  the plot area.
338     *
339     * @return The space.
340     */
341    protected AxisSpace calculateAxisSpace(Graphics2D g2,
342                                           Rectangle2D plotArea) {
343
344        AxisSpace space = new AxisSpace();
345        PlotOrientation orientation = getOrientation();
346
347        // work out the space required by the domain axis...
348        AxisSpace fixed = getFixedDomainAxisSpace();
349        if (fixed != null) {
350            if (orientation == PlotOrientation.HORIZONTAL) {
351                space.setLeft(fixed.getLeft());
352                space.setRight(fixed.getRight());
353            }
354            else if (orientation == PlotOrientation.VERTICAL) {
355                space.setTop(fixed.getTop());
356                space.setBottom(fixed.getBottom());
357            }
358        }
359        else {
360            ValueAxis xAxis = getDomainAxis();
361            RectangleEdge xEdge = Plot.resolveDomainAxisLocation(
362                    getDomainAxisLocation(), orientation);
363            if (xAxis != null) {
364                space = xAxis.reserveSpace(g2, this, plotArea, xEdge, space);
365            }
366        }
367
368        Rectangle2D adjustedPlotArea = space.shrink(plotArea, null);
369
370        // work out the maximum height or width of the non-shared axes...
371        int n = this.subplots.size();
372        int totalWeight = 0;
373        for (int i = 0; i < n; i++) {
374            XYPlot sub = (XYPlot) this.subplots.get(i);
375            totalWeight += sub.getWeight();
376        }
377        this.subplotAreas = new Rectangle2D[n];
378        double x = adjustedPlotArea.getX();
379        double y = adjustedPlotArea.getY();
380        double usableSize = 0.0;
381        if (orientation == PlotOrientation.HORIZONTAL) {
382            usableSize = adjustedPlotArea.getWidth() - this.gap * (n - 1);
383        }
384        else if (orientation == PlotOrientation.VERTICAL) {
385            usableSize = adjustedPlotArea.getHeight() - this.gap * (n - 1);
386        }
387
388        for (int i = 0; i < n; i++) {
389            XYPlot plot = (XYPlot) this.subplots.get(i);
390
391            // calculate sub-plot area
392            if (orientation == PlotOrientation.HORIZONTAL) {
393                double w = usableSize * plot.getWeight() / totalWeight;
394                this.subplotAreas[i] = new Rectangle2D.Double(x, y, w,
395                        adjustedPlotArea.getHeight());
396                x = x + w + this.gap;
397            }
398            else if (orientation == PlotOrientation.VERTICAL) {
399                double h = usableSize * plot.getWeight() / totalWeight;
400                this.subplotAreas[i] = new Rectangle2D.Double(x, y,
401                        adjustedPlotArea.getWidth(), h);
402                y = y + h + this.gap;
403            }
404
405            AxisSpace subSpace = plot.calculateRangeAxisSpace(g2,
406                    this.subplotAreas[i], null);
407            space.ensureAtLeast(subSpace);
408
409        }
410
411        return space;
412    }
413
414    /**
415     * Draws the plot within the specified area on a graphics device.
416     *
417     * @param g2  the graphics device.
418     * @param area  the plot area (in Java2D space).
419     * @param anchor  an anchor point in Java2D space (<code>null</code>
420     *                permitted).
421     * @param parentState  the state from the parent plot, if there is one
422     *                     (<code>null</code> permitted).
423     * @param info  collects chart drawing information (<code>null</code>
424     *              permitted).
425     */
426    public void draw(Graphics2D g2,
427                     Rectangle2D area,
428                     Point2D anchor,
429                     PlotState parentState,
430                     PlotRenderingInfo info) {
431
432        // set up info collection...
433        if (info != null) {
434            info.setPlotArea(area);
435        }
436
437        // adjust the drawing area for plot insets (if any)...
438        RectangleInsets insets = getInsets();
439        insets.trim(area);
440
441        setFixedRangeAxisSpaceForSubplots(null);
442        AxisSpace space = calculateAxisSpace(g2, area);
443        Rectangle2D dataArea = space.shrink(area, null);
444
445        // set the width and height of non-shared axis of all sub-plots
446        setFixedRangeAxisSpaceForSubplots(space);
447
448        // draw the shared axis
449        ValueAxis axis = getDomainAxis();
450        RectangleEdge edge = getDomainAxisEdge();
451        double cursor = RectangleEdge.coordinate(dataArea, edge);
452        AxisState axisState = axis.draw(g2, cursor, area, dataArea, edge, info);
453        if (parentState == null) {
454            parentState = new PlotState();
455        }
456        parentState.getSharedAxisStates().put(axis, axisState);
457
458        // draw all the subplots
459        for (int i = 0; i < this.subplots.size(); i++) {
460            XYPlot plot = (XYPlot) this.subplots.get(i);
461            PlotRenderingInfo subplotInfo = null;
462            if (info != null) {
463                subplotInfo = new PlotRenderingInfo(info.getOwner());
464                info.addSubplotInfo(subplotInfo);
465            }
466            plot.draw(g2, this.subplotAreas[i], anchor, parentState,
467                    subplotInfo);
468        }
469
470        if (info != null) {
471            info.setDataArea(dataArea);
472        }
473
474    }
475
476    /**
477     * Returns a collection of legend items for the plot.
478     *
479     * @return The legend items.
480     */
481    public LegendItemCollection getLegendItems() {
482        LegendItemCollection result = getFixedLegendItems();
483        if (result == null) {
484            result = new LegendItemCollection();
485            if (this.subplots != null) {
486                Iterator iterator = this.subplots.iterator();
487                while (iterator.hasNext()) {
488                    XYPlot plot = (XYPlot) iterator.next();
489                    LegendItemCollection more = plot.getLegendItems();
490                    result.addAll(more);
491                }
492            }
493        }
494        return result;
495    }
496
497    /**
498     * Multiplies the range on the range axis/axes by the specified factor.
499     *
500     * @param factor  the zoom factor.
501     * @param info  the plot rendering info (<code>null</code> not permitted).
502     * @param source  the source point (<code>null</code> not permitted).
503     */
504    public void zoomRangeAxes(double factor, PlotRenderingInfo info,
505                              Point2D source) {
506        zoomRangeAxes(factor, info, source, false);
507    }
508
509    /**
510     * Multiplies the range on the range axis/axes by the specified factor.
511     *
512     * @param factor  the zoom factor.
513     * @param state  the plot state.
514     * @param source  the source point (in Java2D coordinates).
515     * @param useAnchor  use source point as zoom anchor?
516     */
517    public void zoomRangeAxes(double factor, PlotRenderingInfo state,
518                              Point2D source, boolean useAnchor) {
519        // delegate 'state' and 'source' argument checks...
520        XYPlot subplot = findSubplot(state, source);
521        if (subplot != null) {
522            subplot.zoomRangeAxes(factor, state, source, useAnchor);
523        }
524        else {
525            // if the source point doesn't fall within a subplot, we do the
526            // zoom on all subplots...
527            Iterator iterator = getSubplots().iterator();
528            while (iterator.hasNext()) {
529                subplot = (XYPlot) iterator.next();
530                subplot.zoomRangeAxes(factor, state, source, useAnchor);
531            }
532        }
533    }
534
535    /**
536     * Zooms in on the range axes.
537     *
538     * @param lowerPercent  the lower bound.
539     * @param upperPercent  the upper bound.
540     * @param info  the plot rendering info (<code>null</code> not permitted).
541     * @param source  the source point (<code>null</code> not permitted).
542     */
543    public void zoomRangeAxes(double lowerPercent, double upperPercent,
544                              PlotRenderingInfo info, Point2D source) {
545        // delegate 'info' and 'source' argument checks...
546        XYPlot subplot = findSubplot(info, source);
547        if (subplot != null) {
548            subplot.zoomRangeAxes(lowerPercent, upperPercent, info, source);
549        }
550        else {
551            // if the source point doesn't fall within a subplot, we do the
552            // zoom on all subplots...
553            Iterator iterator = getSubplots().iterator();
554            while (iterator.hasNext()) {
555                subplot = (XYPlot) iterator.next();
556                subplot.zoomRangeAxes(lowerPercent, upperPercent, info, source);
557            }
558        }
559    }
560
561    /**
562     * Returns the subplot (if any) that contains the (x, y) point (specified
563     * in Java2D space).
564     *
565     * @param info  the chart rendering info (<code>null</code> not permitted).
566     * @param source  the source point (<code>null</code> not permitted).
567     *
568     * @return A subplot (possibly <code>null</code>).
569     */
570    public XYPlot findSubplot(PlotRenderingInfo info, Point2D source) {
571        if (info == null) {
572            throw new IllegalArgumentException("Null 'info' argument.");
573        }
574        if (source == null) {
575            throw new IllegalArgumentException("Null 'source' argument.");
576        }
577        XYPlot result = null;
578        int subplotIndex = info.getSubplotIndex(source);
579        if (subplotIndex >= 0) {
580            result =  (XYPlot) this.subplots.get(subplotIndex);
581        }
582        return result;
583    }
584
585    /**
586     * Sets the item renderer FOR ALL SUBPLOTS.  Registered listeners are
587     * notified that the plot has been modified.
588     * <P>
589     * Note: usually you will want to set the renderer independently for each
590     * subplot, which is NOT what this method does.
591     *
592     * @param renderer the new renderer.
593     */
594    public void setRenderer(XYItemRenderer renderer) {
595
596        super.setRenderer(renderer);  // not strictly necessary, since the
597                                      // renderer set for the
598                                      // parent plot is not used
599
600        Iterator iterator = this.subplots.iterator();
601        while (iterator.hasNext()) {
602            XYPlot plot = (XYPlot) iterator.next();
603            plot.setRenderer(renderer);
604        }
605
606    }
607
608    /**
609     * Sets the fixed range axis space and sends a {@link PlotChangeEvent} to
610     * all registered listeners.
611     *
612     * @param space  the space (<code>null</code> permitted).
613     */
614    public void setFixedRangeAxisSpace(AxisSpace space) {
615        super.setFixedRangeAxisSpace(space);
616        setFixedRangeAxisSpaceForSubplots(space);
617        fireChangeEvent();
618    }
619
620    /**
621     * Sets the size (width or height, depending on the orientation of the
622     * plot) for the domain axis of each subplot.
623     *
624     * @param space  the space.
625     */
626    protected void setFixedRangeAxisSpaceForSubplots(AxisSpace space) {
627        Iterator iterator = this.subplots.iterator();
628        while (iterator.hasNext()) {
629            XYPlot plot = (XYPlot) iterator.next();
630            plot.setFixedRangeAxisSpace(space, false);
631        }
632    }
633
634    /**
635     * Handles a 'click' on the plot by updating the anchor values.
636     *
637     * @param x  x-coordinate, where the click occured.
638     * @param y  y-coordinate, where the click occured.
639     * @param info  object containing information about the plot dimensions.
640     */
641    public void handleClick(int x, int y, PlotRenderingInfo info) {
642        Rectangle2D dataArea = info.getDataArea();
643        if (dataArea.contains(x, y)) {
644            for (int i = 0; i < this.subplots.size(); i++) {
645                XYPlot subplot = (XYPlot) this.subplots.get(i);
646                PlotRenderingInfo subplotInfo = info.getSubplotInfo(i);
647                subplot.handleClick(x, y, subplotInfo);
648            }
649        }
650    }
651
652    /**
653     * Receives a {@link PlotChangeEvent} and responds by notifying all
654     * listeners.
655     *
656     * @param event  the event.
657     */
658    public void plotChanged(PlotChangeEvent event) {
659        notifyListeners(event);
660    }
661
662    /**
663     * Tests this plot for equality with another object.
664     *
665     * @param obj  the other object.
666     *
667     * @return <code>true</code> or <code>false</code>.
668     */
669    public boolean equals(Object obj) {
670        if (obj == this) {
671            return true;
672        }
673        if (!(obj instanceof CombinedDomainXYPlot)) {
674            return false;
675        }
676        CombinedDomainXYPlot that = (CombinedDomainXYPlot) obj;
677        if (this.gap != that.gap) {
678            return false;
679        }
680        if (!ObjectUtilities.equal(this.subplots, that.subplots)) {
681            return false;
682        }
683        return super.equals(obj);
684    }
685
686    /**
687     * Returns a clone of the annotation.
688     *
689     * @return A clone.
690     *
691     * @throws CloneNotSupportedException  this class will not throw this
692     *         exception, but subclasses (if any) might.
693     */
694    public Object clone() throws CloneNotSupportedException {
695
696        CombinedDomainXYPlot result = (CombinedDomainXYPlot) super.clone();
697        result.subplots = (List) ObjectUtilities.deepClone(this.subplots);
698        for (Iterator it = result.subplots.iterator(); it.hasNext();) {
699            Plot child = (Plot) it.next();
700            child.setParent(result);
701        }
702
703        // after setting up all the subplots, the shared domain axis may need
704        // reconfiguring
705        ValueAxis domainAxis = result.getDomainAxis();
706        if (domainAxis != null) {
707            domainAxis.configure();
708        }
709
710        return result;
711
712    }
713
714}