001    /* ===========================================================
002     * JFreeChart : a free chart library for the Java(tm) platform
003     * ===========================================================
004     *
005     * (C) Copyright 2000-2011, 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     * [Oracle and Java are registered trademarks of Oracle and/or its affiliates. 
025     * Other names may be trademarks of their respective owners.]
026     *
027     * -------------------
028     * XYAreaRenderer.java
029     * -------------------
030     * (C) Copyright 2002-2011, by Hari and Contributors.
031     *
032     * Original Author:  Hari (ourhari@hotmail.com);
033     * Contributor(s):   David Gilbert (for Object Refinery Limited);
034     *                   Richard Atkinson;
035     *                   Christian W. Zuckschwerdt;
036     *                   Martin Krauskopf;
037     *
038     * Changes:
039     * --------
040     * 03-Apr-2002 : Version 1, contributed by Hari.  This class is based on the
041     *               StandardXYItemRenderer class (DG);
042     * 09-Apr-2002 : Removed the translated zero from the drawItem method -
043     *               overridden the initialise() method to calculate it (DG);
044     * 30-May-2002 : Added tool tip generator to constructor to match super
045     *               class (DG);
046     * 25-Jun-2002 : Removed unnecessary local variable (DG);
047     * 05-Aug-2002 : Small modification to drawItem method to support URLs for HTML
048     *               image maps (RA);
049     * 01-Oct-2002 : Fixed errors reported by Checkstyle (DG);
050     * 07-Nov-2002 : Renamed AreaXYItemRenderer --> XYAreaRenderer (DG);
051     * 25-Mar-2003 : Implemented Serializable (DG);
052     * 01-May-2003 : Modified drawItem() method signature (DG);
053     * 27-Jul-2003 : Made line and polygon properties protected rather than
054     *               private (RA);
055     * 30-Jul-2003 : Modified entity constructor (CZ);
056     * 20-Aug-2003 : Implemented Cloneable and PublicCloneable (DG);
057     * 16-Sep-2003 : Changed ChartRenderingInfo --> PlotRenderingInfo (DG);
058     * 07-Oct-2003 : Added renderer state (DG);
059     * 08-Dec-2003 : Modified hotspot for chart entity (DG);
060     * 10-Feb-2004 : Changed the drawItem() method to make cut-and-paste overriding
061     *               easier.  Also moved state class into this class (DG);
062     * 25-Feb-2004 : Replaced CrosshairInfo with CrosshairState.  Renamed
063     *               XYToolTipGenerator --> XYItemLabelGenerator (DG);
064     * 15-Jul-2004 : Switched getX() with getXValue() and getY() with
065     *               getYValue() (DG);
066     * 11-Nov-2004 : Now uses ShapeUtilities to translate shapes (DG);
067     * 19-Jan-2005 : Now accesses primitives only from dataset (DG);
068     * 21-Mar-2005 : Override getLegendItem() and equals() methods (DG);
069     * 20-Apr-2005 : Use generators for legend tooltips and URLs (DG);
070     * ------------- JFREECHART 1.0.x ---------------------------------------------
071     * 06-Feb-2007 : Fixed bug 1086307, crosshairs with multiple axes (DG);
072     * 14-Feb-2007 : Fixed bug in clone() (DG);
073     * 20-Apr-2007 : Updated getLegendItem() for renderer change (DG);
074     * 04-May-2007 : Set processVisibleItemsOnly flag to false (DG);
075     * 17-May-2007 : Set datasetIndex and seriesIndex in getLegendItem() (DG);
076     * 18-May-2007 : Set dataset and seriesKey for LegendItem (DG);
077     * 17-Jun-2008 : Apply legend font and paint attributes (DG);
078     * 31-Dec-2008 : Fix for bug 2471906 - dashed outlines performance issue (DG);
079     * 11-Jun-2009 : Added a useFillPaint flag and a GradientPaintTransformer for
080     *               the paint under the series (DG);
081     * 06-Oct-2011 : Avoid GeneralPath methods requiring Java 1.5 (MK);
082     *
083     */
084    
085    package org.jfree.chart.renderer.xy;
086    
087    import java.awt.BasicStroke;
088    import java.awt.GradientPaint;
089    import java.awt.Graphics2D;
090    import java.awt.Paint;
091    import java.awt.Shape;
092    import java.awt.Stroke;
093    import java.awt.geom.Area;
094    import java.awt.geom.GeneralPath;
095    import java.awt.geom.Line2D;
096    import java.awt.geom.Rectangle2D;
097    import java.io.IOException;
098    import java.io.ObjectInputStream;
099    import java.io.ObjectOutputStream;
100    
101    import org.jfree.chart.HashUtilities;
102    import org.jfree.chart.LegendItem;
103    import org.jfree.chart.axis.ValueAxis;
104    import org.jfree.chart.entity.EntityCollection;
105    import org.jfree.chart.event.RendererChangeEvent;
106    import org.jfree.chart.labels.XYSeriesLabelGenerator;
107    import org.jfree.chart.labels.XYToolTipGenerator;
108    import org.jfree.chart.plot.CrosshairState;
109    import org.jfree.chart.plot.PlotOrientation;
110    import org.jfree.chart.plot.PlotRenderingInfo;
111    import org.jfree.chart.plot.XYPlot;
112    import org.jfree.chart.urls.XYURLGenerator;
113    import org.jfree.data.xy.XYDataset;
114    import org.jfree.io.SerialUtilities;
115    import org.jfree.ui.GradientPaintTransformer;
116    import org.jfree.ui.StandardGradientPaintTransformer;
117    import org.jfree.util.PublicCloneable;
118    import org.jfree.util.ShapeUtilities;
119    
120    /**
121     * Area item renderer for an {@link XYPlot}.  This class can draw (a) shapes at
122     * each point, or (b) lines between points, or (c) both shapes and lines,
123     * or (d) filled areas, or (e) filled areas and shapes. The example shown here
124     * is generated by the <code>XYAreaRendererDemo1.java</code> program included
125     * in the JFreeChart demo collection:
126     * <br><br>
127     * <img src="../../../../../images/XYAreaRendererSample.png"
128     * alt="XYAreaRendererSample.png" />
129     */
130    public class XYAreaRenderer extends AbstractXYItemRenderer
131            implements XYItemRenderer, PublicCloneable {
132    
133        /** For serialization. */
134        private static final long serialVersionUID = -4481971353973876747L;
135    
136        /**
137         * A state object used by this renderer.
138         */
139        static class XYAreaRendererState extends XYItemRendererState {
140    
141            /** Working storage for the area under one series. */
142            public GeneralPath area;
143    
144            /** Working line that can be recycled. */
145            public Line2D line;
146    
147            /**
148             * Creates a new state.
149             *
150             * @param info  the plot rendering info.
151             */
152            public XYAreaRendererState(PlotRenderingInfo info) {
153                super(info);
154                this.area = new GeneralPath();
155                this.line = new Line2D.Double();
156            }
157    
158        }
159    
160        /** Useful constant for specifying the type of rendering (shapes only). */
161        public static final int SHAPES = 1;
162    
163        /** Useful constant for specifying the type of rendering (lines only). */
164        public static final int LINES = 2;
165    
166        /**
167         * Useful constant for specifying the type of rendering (shapes and lines).
168         */
169        public static final int SHAPES_AND_LINES = 3;
170    
171        /** Useful constant for specifying the type of rendering (area only). */
172        public static final int AREA = 4;
173    
174        /**
175         * Useful constant for specifying the type of rendering (area and shapes).
176         */
177        public static final int AREA_AND_SHAPES = 5;
178    
179        /** A flag indicating whether or not shapes are drawn at each XY point. */
180        private boolean plotShapes;
181    
182        /** A flag indicating whether or not lines are drawn between XY points. */
183        private boolean plotLines;
184    
185        /** A flag indicating whether or not Area are drawn at each XY point. */
186        private boolean plotArea;
187    
188        /** A flag that controls whether or not the outline is shown. */
189        private boolean showOutline;
190    
191        /**
192         * The shape used to represent an area in each legend item (this should
193         * never be <code>null</code>).
194         */
195        private transient Shape legendArea;
196    
197        /**
198         * A flag that can be set to specify that the fill paint should be used
199         * to fill the area under the renderer.
200         * 
201         * @since 1.0.14
202         */
203        private boolean useFillPaint;
204    
205        /**
206         * A transformer that is applied to the paint used to fill under the
207         * area *if* it is an instance of GradientPaint.
208         *
209         * @since 1.0.14
210         */
211        private GradientPaintTransformer gradientTransformer;
212    
213        /**
214         * Constructs a new renderer.
215         */
216        public XYAreaRenderer() {
217            this(AREA);
218        }
219    
220        /**
221         * Constructs a new renderer.
222         *
223         * @param type  the type of the renderer.
224         */
225        public XYAreaRenderer(int type) {
226            this(type, null, null);
227        }
228    
229        /**
230         * Constructs a new renderer.  To specify the type of renderer, use one of
231         * the constants: <code>SHAPES</code>, <code>LINES</code>,
232         * <code>SHAPES_AND_LINES</code>, <code>AREA</code> or
233         * <code>AREA_AND_SHAPES</code>.
234         *
235         * @param type  the type of renderer.
236         * @param toolTipGenerator  the tool tip generator to use
237         *                          (<code>null</code> permitted).
238         * @param urlGenerator  the URL generator (<code>null</code> permitted).
239         */
240        public XYAreaRenderer(int type, XYToolTipGenerator toolTipGenerator,
241                              XYURLGenerator urlGenerator) {
242    
243            super();
244            setBaseToolTipGenerator(toolTipGenerator);
245            setURLGenerator(urlGenerator);
246    
247            if (type == SHAPES) {
248                this.plotShapes = true;
249            }
250            if (type == LINES) {
251                this.plotLines = true;
252            }
253            if (type == SHAPES_AND_LINES) {
254                this.plotShapes = true;
255                this.plotLines = true;
256            }
257            if (type == AREA) {
258                this.plotArea = true;
259            }
260            if (type == AREA_AND_SHAPES) {
261                this.plotArea = true;
262                this.plotShapes = true;
263            }
264            this.showOutline = false;
265            GeneralPath area = new GeneralPath();
266            area.moveTo(0.0f, -4.0f);
267            area.lineTo(3.0f, -2.0f);
268            area.lineTo(4.0f, 4.0f);
269            area.lineTo(-4.0f, 4.0f);
270            area.lineTo(-3.0f, -2.0f);
271            area.closePath();
272            this.legendArea = area;
273            this.useFillPaint = false;
274            this.gradientTransformer = new StandardGradientPaintTransformer();
275        }
276    
277        /**
278         * Returns true if shapes are being plotted by the renderer.
279         *
280         * @return <code>true</code> if shapes are being plotted by the renderer.
281         */
282        public boolean getPlotShapes() {
283            return this.plotShapes;
284        }
285    
286        /**
287         * Returns true if lines are being plotted by the renderer.
288         *
289         * @return <code>true</code> if lines are being plotted by the renderer.
290         */
291        public boolean getPlotLines() {
292            return this.plotLines;
293        }
294    
295        /**
296         * Returns true if Area is being plotted by the renderer.
297         *
298         * @return <code>true</code> if Area is being plotted by the renderer.
299         */
300        public boolean getPlotArea() {
301            return this.plotArea;
302        }
303    
304        /**
305         * Returns a flag that controls whether or not outlines of the areas are
306         * drawn.
307         *
308         * @return The flag.
309         *
310         * @see #setOutline(boolean)
311         */
312        public boolean isOutline() {
313            return this.showOutline;
314        }
315    
316        /**
317         * Sets a flag that controls whether or not outlines of the areas are drawn
318         * and sends a {@link RendererChangeEvent} to all registered listeners.
319         *
320         * @param show  the flag.
321         *
322         * @see #isOutline()
323         */
324        public void setOutline(boolean show) {
325            this.showOutline = show;
326            fireChangeEvent();
327        }
328    
329        /**
330         * Returns the shape used to represent an area in the legend.
331         *
332         * @return The legend area (never <code>null</code>).
333         */
334        public Shape getLegendArea() {
335            return this.legendArea;
336        }
337    
338        /**
339         * Sets the shape used as an area in each legend item and sends a
340         * {@link RendererChangeEvent} to all registered listeners.
341         *
342         * @param area  the area (<code>null</code> not permitted).
343         */
344        public void setLegendArea(Shape area) {
345            if (area == null) {
346                throw new IllegalArgumentException("Null 'area' argument.");
347            }
348            this.legendArea = area;
349            fireChangeEvent();
350        }
351    
352        /**
353         * Returns the flag that controls whether the series fill paint is used to
354         * fill the area under the line.
355         *
356         * @return A boolean.
357         *
358         * @since 1.0.14
359         */
360        public boolean getUseFillPaint() {
361            return this.useFillPaint;
362        }
363    
364        /**
365         * Sets the flag that controls whether or not the series fill paint is
366         * used to fill the area under the line and sends a
367         * {@link RendererChangeEvent} to all listeners.
368         *
369         * @param use  the new flag value.
370         *
371         * @since 1.0.14
372         */
373        public void setUseFillPaint(boolean use) {
374            this.useFillPaint = use;
375            fireChangeEvent();
376        }
377    
378        /**
379         * Returns the gradient paint transformer.
380         *
381         * @return The gradient paint transformer (never <code>null</code>).
382         *
383         * @since 1.0.14
384         */
385        public GradientPaintTransformer getGradientTransformer() {
386            return this.gradientTransformer;
387        }
388    
389        /**
390         * Sets the gradient paint transformer and sends a
391         * {@link RendererChangeEvent} to all registered listeners.
392         *
393         * @param transformer  the transformer (<code>null</code> not permitted).
394         *
395         * @since 1.0.14
396         */
397        public void setGradientTransformer(GradientPaintTransformer transformer) {
398            if (transformer == null) {
399                throw new IllegalArgumentException("Null 'transformer' argument.");
400            }
401            this.gradientTransformer = transformer;
402            fireChangeEvent();
403        }
404    
405        /**
406         * Initialises the renderer and returns a state object that should be
407         * passed to all subsequent calls to the drawItem() method.
408         *
409         * @param g2  the graphics device.
410         * @param dataArea  the area inside the axes.
411         * @param plot  the plot.
412         * @param data  the data.
413         * @param info  an optional info collection object to return data back to
414         *              the caller.
415         *
416         * @return A state object for use by the renderer.
417         */
418        public XYItemRendererState initialise(Graphics2D g2, Rectangle2D dataArea,
419                XYPlot plot, XYDataset data, PlotRenderingInfo info) {
420            XYAreaRendererState state = new XYAreaRendererState(info);
421    
422            // in the rendering process, there is special handling for item
423            // zero, so we can't support processing of visible data items only
424            state.setProcessVisibleItemsOnly(false);
425            return state;
426        }
427    
428        /**
429         * Returns a default legend item for the specified series.  Subclasses
430         * should override this method to generate customised items.
431         *
432         * @param datasetIndex  the dataset index (zero-based).
433         * @param series  the series index (zero-based).
434         *
435         * @return A legend item for the series.
436         */
437        public LegendItem getLegendItem(int datasetIndex, int series) {
438            LegendItem result = null;
439            XYPlot xyplot = getPlot();
440            if (xyplot != null) {
441                XYDataset dataset = xyplot.getDataset(datasetIndex);
442                if (dataset != null) {
443                    XYSeriesLabelGenerator lg = getLegendItemLabelGenerator();
444                    String label = lg.generateLabel(dataset, series);
445                    String description = label;
446                    String toolTipText = null;
447                    if (getLegendItemToolTipGenerator() != null) {
448                        toolTipText = getLegendItemToolTipGenerator().generateLabel(
449                                dataset, series);
450                    }
451                    String urlText = null;
452                    if (getLegendItemURLGenerator() != null) {
453                        urlText = getLegendItemURLGenerator().generateLabel(
454                                dataset, series);
455                    }
456                    Paint paint = lookupSeriesPaint(series);
457                    result = new LegendItem(label, description, toolTipText,
458                            urlText, this.legendArea, paint);
459                    result.setLabelFont(lookupLegendTextFont(series));
460                    Paint labelPaint = lookupLegendTextPaint(series);
461                    if (labelPaint != null) {
462                        result.setLabelPaint(labelPaint);
463                    }
464                    result.setDataset(dataset);
465                    result.setDatasetIndex(datasetIndex);
466                    result.setSeriesKey(dataset.getSeriesKey(series));
467                    result.setSeriesIndex(series);
468                }
469            }
470            return result;
471        }
472    
473        /**
474         * Draws the visual representation of a single data item.
475         *
476         * @param g2  the graphics device.
477         * @param state  the renderer state.
478         * @param dataArea  the area within which the data is being drawn.
479         * @param info  collects information about the drawing.
480         * @param plot  the plot (can be used to obtain standard color information
481         *              etc).
482         * @param domainAxis  the domain axis.
483         * @param rangeAxis  the range axis.
484         * @param dataset  the dataset.
485         * @param series  the series index (zero-based).
486         * @param item  the item index (zero-based).
487         * @param crosshairState  crosshair information for the plot
488         *                        (<code>null</code> permitted).
489         * @param pass  the pass index.
490         */
491        public void drawItem(Graphics2D g2, XYItemRendererState state,
492                Rectangle2D dataArea, PlotRenderingInfo info, XYPlot plot,
493                ValueAxis domainAxis, ValueAxis rangeAxis, XYDataset dataset,
494                int series, int item, CrosshairState crosshairState, int pass) {
495    
496            if (!getItemVisible(series, item)) {
497                return;
498            }
499            XYAreaRendererState areaState = (XYAreaRendererState) state;
500    
501            // get the data point...
502            double x1 = dataset.getXValue(series, item);
503            double y1 = dataset.getYValue(series, item);
504            if (Double.isNaN(y1)) {
505                y1 = 0.0;
506            }
507            double transX1 = domainAxis.valueToJava2D(x1, dataArea,
508                    plot.getDomainAxisEdge());
509            double transY1 = rangeAxis.valueToJava2D(y1, dataArea,
510                    plot.getRangeAxisEdge());
511    
512            // get the previous point and the next point so we can calculate a
513            // "hot spot" for the area (used by the chart entity)...
514            int itemCount = dataset.getItemCount(series);
515            double x0 = dataset.getXValue(series, Math.max(item - 1, 0));
516            double y0 = dataset.getYValue(series, Math.max(item - 1, 0));
517            if (Double.isNaN(y0)) {
518                y0 = 0.0;
519            }
520            double transX0 = domainAxis.valueToJava2D(x0, dataArea,
521                    plot.getDomainAxisEdge());
522            double transY0 = rangeAxis.valueToJava2D(y0, dataArea,
523                    plot.getRangeAxisEdge());
524    
525            double x2 = dataset.getXValue(series, Math.min(item + 1,
526                    itemCount - 1));
527            double y2 = dataset.getYValue(series, Math.min(item + 1,
528                    itemCount - 1));
529            if (Double.isNaN(y2)) {
530                y2 = 0.0;
531            }
532            double transX2 = domainAxis.valueToJava2D(x2, dataArea,
533                    plot.getDomainAxisEdge());
534            double transY2 = rangeAxis.valueToJava2D(y2, dataArea,
535                    plot.getRangeAxisEdge());
536    
537            double transZero = rangeAxis.valueToJava2D(0.0, dataArea,
538                    plot.getRangeAxisEdge());
539            GeneralPath hotspot = new GeneralPath();
540            if (plot.getOrientation() == PlotOrientation.HORIZONTAL) {
541                moveTo(hotspot, transZero, ((transX0 + transX1) / 2.0));
542                lineTo(hotspot, ((transY0 + transY1) / 2.0), 
543                                ((transX0 + transX1) / 2.0));
544                lineTo(hotspot, transY1, transX1);
545                lineTo(hotspot, ((transY1 + transY2) / 2.0), 
546                                ((transX1 + transX2) / 2.0));
547                lineTo(hotspot, transZero, ((transX1 + transX2) / 2.0));
548            }
549            else {  // vertical orientation
550                moveTo(hotspot, ((transX0 + transX1) / 2.0), transZero);
551                lineTo(hotspot, ((transX0 + transX1) / 2.0),
552                                ((transY0 + transY1) / 2.0));
553                lineTo(hotspot, transX1, transY1);
554                lineTo(hotspot, ((transX1 + transX2) / 2.0),
555                                ((transY1 + transY2) / 2.0));
556                lineTo(hotspot, ((transX1 + transX2) / 2.0), transZero);
557            }
558            hotspot.closePath();
559    
560            if (item == 0) {  // create a new area polygon for the series
561                areaState.area = new GeneralPath();
562                // the first point is (x, 0)
563                double zero = rangeAxis.valueToJava2D(0.0, dataArea,
564                        plot.getRangeAxisEdge());
565                if (plot.getOrientation() == PlotOrientation.VERTICAL) {
566                    moveTo(areaState.area, transX1, zero);
567                }
568                else if (plot.getOrientation() == PlotOrientation.HORIZONTAL) {
569                    moveTo(areaState.area, zero, transX1);
570                }
571            }
572    
573            // Add each point to Area (x, y)
574            if (plot.getOrientation() == PlotOrientation.VERTICAL) {
575                lineTo(areaState.area, transX1, transY1);
576            }
577            else if (plot.getOrientation() == PlotOrientation.HORIZONTAL) {
578                lineTo(areaState.area, transY1, transX1);
579            }
580    
581            PlotOrientation orientation = plot.getOrientation();
582            Paint paint = getItemPaint(series, item);
583            Stroke stroke = getItemStroke(series, item);
584            g2.setPaint(paint);
585            g2.setStroke(stroke);
586    
587            Shape shape = null;
588            if (getPlotShapes()) {
589                shape = getItemShape(series, item);
590                if (orientation == PlotOrientation.VERTICAL) {
591                    shape = ShapeUtilities.createTranslatedShape(shape, transX1,
592                            transY1);
593                }
594                else if (orientation == PlotOrientation.HORIZONTAL) {
595                    shape = ShapeUtilities.createTranslatedShape(shape, transY1,
596                            transX1);
597                }
598                g2.draw(shape);
599            }
600    
601            if (getPlotLines()) {
602                if (item > 0) {
603                    if (plot.getOrientation() == PlotOrientation.VERTICAL) {
604                        areaState.line.setLine(transX0, transY0, transX1, transY1);
605                    }
606                    else if (plot.getOrientation() == PlotOrientation.HORIZONTAL) {
607                        areaState.line.setLine(transY0, transX0, transY1, transX1);
608                    }
609                    g2.draw(areaState.line);
610                }
611            }
612    
613            // Check if the item is the last item for the series.
614            // and number of items > 0.  We can't draw an area for a single point.
615            if (getPlotArea() && item > 0 && item == (itemCount - 1)) {
616    
617                if (orientation == PlotOrientation.VERTICAL) {
618                    // Add the last point (x,0)
619                    lineTo(areaState.area, transX1, transZero);
620                    areaState.area.closePath();
621                }
622                else if (orientation == PlotOrientation.HORIZONTAL) {
623                    // Add the last point (x,0)
624                    lineTo(areaState.area, transZero, transX1);
625                    areaState.area.closePath();
626                }
627    
628                if (this.useFillPaint) {
629                    paint = lookupSeriesFillPaint(series);
630                }
631                if (paint instanceof GradientPaint) {
632                    GradientPaint gp = (GradientPaint) paint;
633                    GradientPaint adjGP = this.gradientTransformer.transform(gp,
634                            dataArea);
635                    g2.setPaint(adjGP);
636                }
637                g2.fill(areaState.area);
638    
639                // draw an outline around the Area.
640                if (isOutline()) {
641                    Shape area = areaState.area;
642    
643                    // Java2D has some issues drawing dashed lines around "large"
644                    // geometrical shapes - for example, see bug 6620013 in the
645                    // Java bug database.  So, we'll check if the outline is
646                    // dashed and, if it is, do our own clipping before drawing
647                    // the outline...
648                    Stroke outlineStroke = lookupSeriesOutlineStroke(series);
649                    if (outlineStroke instanceof BasicStroke) {
650                        BasicStroke bs = (BasicStroke) outlineStroke;
651                        if (bs.getDashArray() != null) {
652                            Area poly = new Area(areaState.area);
653                            // we make the clip region slightly larger than the
654                            // dataArea so that the clipped edges don't show lines
655                            // on the chart
656                            Area clip = new Area(new Rectangle2D.Double(
657                                    dataArea.getX() - 5.0, dataArea.getY() - 5.0,
658                                    dataArea.getWidth() + 10.0,
659                                    dataArea.getHeight() + 10.0));
660                            poly.intersect(clip);
661                            area = poly;
662                        }
663                    } // end of workaround
664    
665                    g2.setStroke(outlineStroke);
666                    g2.setPaint(lookupSeriesOutlinePaint(series));
667                    g2.draw(area);
668                }
669            }
670    
671            int domainAxisIndex = plot.getDomainAxisIndex(domainAxis);
672            int rangeAxisIndex = plot.getRangeAxisIndex(rangeAxis);
673            updateCrosshairValues(crosshairState, x1, y1, domainAxisIndex,
674                    rangeAxisIndex, transX1, transY1, orientation);
675    
676            // collect entity and tool tip information...
677            EntityCollection entities = state.getEntityCollection();
678            if (entities != null) {
679                addEntity(entities, hotspot, dataset, series, item, 0.0, 0.0);
680            }
681    
682        }
683    
684        /**
685         * Returns a clone of the renderer.
686         *
687         * @return A clone.
688         *
689         * @throws CloneNotSupportedException  if the renderer cannot be cloned.
690         */
691        public Object clone() throws CloneNotSupportedException {
692            XYAreaRenderer clone = (XYAreaRenderer) super.clone();
693            clone.legendArea = ShapeUtilities.clone(this.legendArea);
694            return clone;
695        }
696    
697        /**
698         * Tests this renderer for equality with an arbitrary object.
699         *
700         * @param obj  the object (<code>null</code> permitted).
701         *
702         * @return A boolean.
703         */
704        public boolean equals(Object obj) {
705            if (obj == this) {
706                return true;
707            }
708            if (!(obj instanceof XYAreaRenderer)) {
709                return false;
710            }
711            XYAreaRenderer that = (XYAreaRenderer) obj;
712            if (this.plotArea != that.plotArea) {
713                return false;
714            }
715            if (this.plotLines != that.plotLines) {
716                return false;
717            }
718            if (this.plotShapes != that.plotShapes) {
719                return false;
720            }
721            if (this.showOutline != that.showOutline) {
722                return false;
723            }
724            if (this.useFillPaint != that.useFillPaint) {
725                return false;
726            }
727            if (!this.gradientTransformer.equals(that.gradientTransformer)) {
728                return false;
729            }
730            if (!ShapeUtilities.equal(this.legendArea, that.legendArea)) {
731                return false;
732            }
733            return true;
734        }
735    
736        /**
737         * Returns a hash code for this instance.
738         *
739         * @return A hash code.
740         */
741        public int hashCode() {
742            int result = super.hashCode();
743            result = HashUtilities.hashCode(result, this.plotArea);
744            result = HashUtilities.hashCode(result, this.plotLines);
745            result = HashUtilities.hashCode(result, this.plotShapes);
746            result = HashUtilities.hashCode(result, this.useFillPaint);
747            return result;
748        }
749    
750        /**
751         * Provides serialization support.
752         *
753         * @param stream  the input stream.
754         *
755         * @throws IOException  if there is an I/O error.
756         * @throws ClassNotFoundException  if there is a classpath problem.
757         */
758        private void readObject(ObjectInputStream stream)
759                throws IOException, ClassNotFoundException {
760            stream.defaultReadObject();
761            this.legendArea = SerialUtilities.readShape(stream);
762        }
763    
764        /**
765         * Provides serialization support.
766         *
767         * @param stream  the output stream.
768         *
769         * @throws IOException  if there is an I/O error.
770         */
771        private void writeObject(ObjectOutputStream stream) throws IOException {
772            stream.defaultWriteObject();
773            SerialUtilities.writeShape(this.legendArea, stream);
774        }
775    }