Source for org.jfree.chart.renderer.xy.XYAreaRenderer

   1: /* ===========================================================
   2:  * JFreeChart : a free chart library for the Java(tm) platform
   3:  * ===========================================================
   4:  *
   5:  * (C) Copyright 2000-2007, by Object Refinery Limited and Contributors.
   6:  *
   7:  * Project Info:  http://www.jfree.org/jfreechart/index.html
   8:  *
   9:  * This library is free software; you can redistribute it and/or modify it 
  10:  * under the terms of the GNU Lesser General Public License as published by 
  11:  * the Free Software Foundation; either version 2.1 of the License, or 
  12:  * (at your option) any later version.
  13:  *
  14:  * This library is distributed in the hope that it will be useful, but 
  15:  * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 
  16:  * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public 
  17:  * License for more details.
  18:  *
  19:  * You should have received a copy of the GNU Lesser General Public
  20:  * License along with this library; if not, write to the Free Software
  21:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, 
  22:  * USA.  
  23:  *
  24:  * [Java is a trademark or registered trademark of Sun Microsystems, Inc. 
  25:  * in the United States and other countries.]
  26:  *
  27:  * -------------------
  28:  * XYAreaRenderer.java
  29:  * -------------------
  30:  * (C) Copyright 2002-2007, by Hari and Contributors.
  31:  *
  32:  * Original Author:  Hari (ourhari@hotmail.com);
  33:  * Contributor(s):   David Gilbert (for Object Refinery Limited);
  34:  *                   Richard Atkinson;
  35:  *                   Christian W. Zuckschwerdt;
  36:  *
  37:  * $Id: XYAreaRenderer.java,v 1.12.2.7 2007/02/14 15:05:32 mungady Exp $
  38:  *
  39:  * Changes:
  40:  * --------
  41:  * 03-Apr-2002 : Version 1, contributed by Hari.  This class is based on the 
  42:  *               StandardXYItemRenderer class (DG);
  43:  * 09-Apr-2002 : Removed the translated zero from the drawItem method - 
  44:  *               overridden the initialise() method to calculate it (DG);
  45:  * 30-May-2002 : Added tool tip generator to constructor to match super 
  46:  *               class (DG);
  47:  * 25-Jun-2002 : Removed unnecessary local variable (DG);
  48:  * 05-Aug-2002 : Small modification to drawItem method to support URLs for HTML
  49:  *               image maps (RA);
  50:  * 01-Oct-2002 : Fixed errors reported by Checkstyle (DG);
  51:  * 07-Nov-2002 : Renamed AreaXYItemRenderer --> XYAreaRenderer (DG);
  52:  * 25-Mar-2003 : Implemented Serializable (DG);
  53:  * 01-May-2003 : Modified drawItem() method signature (DG);
  54:  * 27-Jul-2003 : Made line and polygon properties protected rather than 
  55:  *               private (RA);
  56:  * 30-Jul-2003 : Modified entity constructor (CZ);
  57:  * 20-Aug-2003 : Implemented Cloneable and PublicCloneable (DG);
  58:  * 16-Sep-2003 : Changed ChartRenderingInfo --> PlotRenderingInfo (DG);
  59:  * 07-Oct-2003 : Added renderer state (DG);
  60:  * 08-Dec-2003 : Modified hotspot for chart entity (DG);
  61:  * 10-Feb-2004 : Changed the drawItem() method to make cut-and-paste overriding
  62:  *               easier.  Also moved state class into this class (DG);
  63:  * 25-Feb-2004 : Replaced CrosshairInfo with CrosshairState.  Renamed 
  64:  *               XYToolTipGenerator --> XYItemLabelGenerator (DG);
  65:  * 15-Jul-2004 : Switched getX() with getXValue() and getY() with 
  66:  *               getYValue() (DG);
  67:  * 11-Nov-2004 : Now uses ShapeUtilities to translate shapes (DG);
  68:  * 19-Jan-2005 : Now accesses primitives only from dataset (DG);
  69:  * 21-Mar-2005 : Override getLegendItem() and equals() methods (DG);
  70:  * 20-Apr-2005 : Use generators for legend tooltips and URLs (DG);
  71:  * ------------- JFREECHART 1.0.x ---------------------------------------------
  72:  * 06-Feb-2007 : Fixed bug 1086307, crosshairs with multiple axes (DG);
  73:  * 14-Feb-2007 : Fixed bug in clone() (DG);
  74:  *
  75:  */
  76: 
  77: package org.jfree.chart.renderer.xy;
  78: 
  79: import java.awt.Graphics2D;
  80: import java.awt.Paint;
  81: import java.awt.Polygon;
  82: import java.awt.Shape;
  83: import java.awt.Stroke;
  84: import java.awt.geom.GeneralPath;
  85: import java.awt.geom.Line2D;
  86: import java.awt.geom.Rectangle2D;
  87: import java.io.IOException;
  88: import java.io.ObjectInputStream;
  89: import java.io.ObjectOutputStream;
  90: import java.io.Serializable;
  91: 
  92: import org.jfree.chart.LegendItem;
  93: import org.jfree.chart.axis.ValueAxis;
  94: import org.jfree.chart.entity.EntityCollection;
  95: import org.jfree.chart.entity.XYItemEntity;
  96: import org.jfree.chart.event.RendererChangeEvent;
  97: import org.jfree.chart.labels.XYSeriesLabelGenerator;
  98: import org.jfree.chart.labels.XYToolTipGenerator;
  99: import org.jfree.chart.plot.CrosshairState;
 100: import org.jfree.chart.plot.PlotOrientation;
 101: import org.jfree.chart.plot.PlotRenderingInfo;
 102: import org.jfree.chart.plot.XYPlot;
 103: import org.jfree.chart.urls.XYURLGenerator;
 104: import org.jfree.data.xy.XYDataset;
 105: import org.jfree.io.SerialUtilities;
 106: import org.jfree.util.PublicCloneable;
 107: import org.jfree.util.ShapeUtilities;
 108: 
 109: /**
 110:  * Area item renderer for an {@link XYPlot}.  This class can draw (a) shapes at
 111:  * each point, or (b) lines between points, or (c) both shapes and lines, 
 112:  * or (d) filled areas, or (e) filled areas and shapes.
 113:  */
 114: public class XYAreaRenderer extends AbstractXYItemRenderer 
 115:                             implements XYItemRenderer, 
 116:                                        Cloneable,
 117:                                        PublicCloneable,
 118:                                        Serializable {
 119: 
 120:     /** For serialization. */
 121:     private static final long serialVersionUID = -4481971353973876747L;
 122:     
 123:     /**
 124:      * A state object used by this renderer.
 125:      */
 126:     static class XYAreaRendererState extends XYItemRendererState {
 127:         
 128:         /** Working storage for the area under one series. */
 129:         public Polygon area;
 130:         
 131:         /** Working line that can be recycled. */
 132:         public Line2D line;
 133:         
 134:         /**
 135:          * Creates a new state.
 136:          * 
 137:          * @param info  the plot rendering info.
 138:          */
 139:         public XYAreaRendererState(PlotRenderingInfo info) {
 140:             super(info);
 141:             this.area = new Polygon();
 142:             this.line = new Line2D.Double();
 143:         }
 144:         
 145:     }
 146:     
 147:     /** Useful constant for specifying the type of rendering (shapes only). */
 148:     public static final int SHAPES = 1;
 149: 
 150:     /** Useful constant for specifying the type of rendering (lines only). */
 151:     public static final int LINES = 2;
 152: 
 153:     /** 
 154:      * Useful constant for specifying the type of rendering (shapes and lines).
 155:      */
 156:     public static final int SHAPES_AND_LINES = 3;
 157: 
 158:     /** Useful constant for specifying the type of rendering (area only). */
 159:     public static final int AREA = 4;
 160: 
 161:     /** 
 162:      * Useful constant for specifying the type of rendering (area and shapes). 
 163:      */
 164:     public static final int AREA_AND_SHAPES = 5;
 165: 
 166:     /** A flag indicating whether or not shapes are drawn at each XY point. */
 167:     private boolean plotShapes;
 168: 
 169:     /** A flag indicating whether or not lines are drawn between XY points. */
 170:     private boolean plotLines;
 171: 
 172:     /** A flag indicating whether or not Area are drawn at each XY point. */
 173:     private boolean plotArea;
 174: 
 175:     /** A flag that controls whether or not the outline is shown. */
 176:     private boolean showOutline;
 177: 
 178:     /** 
 179:      * The shape used to represent an area in each legend item (this should 
 180:      * never be <code>null</code>). 
 181:      */
 182:     private transient Shape legendArea;
 183: 
 184:     /**
 185:      * Constructs a new renderer.
 186:      */
 187:     public XYAreaRenderer() {
 188:         this(AREA);
 189:     }
 190: 
 191:     /**
 192:      * Constructs a new renderer.
 193:      *
 194:      * @param type  the type of the renderer.
 195:      */
 196:     public XYAreaRenderer(int type) {
 197:         this(type, null, null);
 198:     }
 199: 
 200:     /**
 201:      * Constructs a new renderer.  To specify the type of renderer, use one of 
 202:      * the constants: <code>SHAPES</code>, <code>LINES</code>,
 203:      * <code>SHAPES_AND_LINES</code>, <code>AREA</code> or 
 204:      * <code>AREA_AND_SHAPES</code>.
 205:      *
 206:      * @param type  the type of renderer.
 207:      * @param toolTipGenerator  the tool tip generator to use 
 208:      *                          (<code>null</code> permitted).
 209:      * @param urlGenerator  the URL generator (<code>null</code> permitted).
 210:      */
 211:     public XYAreaRenderer(int type, XYToolTipGenerator toolTipGenerator, 
 212:                           XYURLGenerator urlGenerator) {
 213: 
 214:         super();
 215:         setBaseToolTipGenerator(toolTipGenerator);
 216:         setURLGenerator(urlGenerator);
 217: 
 218:         if (type == SHAPES) {
 219:             this.plotShapes = true;
 220:         }
 221:         if (type == LINES) {
 222:             this.plotLines = true;
 223:         }
 224:         if (type == SHAPES_AND_LINES) {
 225:             this.plotShapes = true;
 226:             this.plotLines = true;
 227:         }
 228:         if (type == AREA) {
 229:             this.plotArea = true;
 230:         }
 231:         if (type == AREA_AND_SHAPES) {
 232:             this.plotArea = true;
 233:             this.plotShapes = true;
 234:         }
 235:         this.showOutline = false;
 236:         GeneralPath area = new GeneralPath();
 237:         area.moveTo(0.0f, -4.0f);
 238:         area.lineTo(3.0f, -2.0f);
 239:         area.lineTo(4.0f, 4.0f);
 240:         area.lineTo(-4.0f, 4.0f);
 241:         area.lineTo(-3.0f, -2.0f);
 242:         area.closePath();
 243:         this.legendArea = area;
 244: 
 245:     }
 246: 
 247:     /**
 248:      * Returns true if shapes are being plotted by the renderer.
 249:      *
 250:      * @return <code>true</code> if shapes are being plotted by the renderer.
 251:      */
 252:     public boolean getPlotShapes() {
 253:         return this.plotShapes;
 254:     }
 255: 
 256:     /**
 257:      * Returns true if lines are being plotted by the renderer.
 258:      *
 259:      * @return <code>true</code> if lines are being plotted by the renderer.
 260:      */
 261:     public boolean getPlotLines() {
 262:         return this.plotLines;
 263:     }
 264: 
 265:     /**
 266:      * Returns true if Area is being plotted by the renderer.
 267:      *
 268:      * @return <code>true</code> if Area is being plotted by the renderer.
 269:      */
 270:     public boolean getPlotArea() {
 271:         return this.plotArea;
 272:     }
 273: 
 274:     /**
 275:      * Returns a flag that controls whether or not outlines of the areas are 
 276:      * drawn.
 277:      *
 278:      * @return The flag.
 279:      * 
 280:      * @see #setOutline(boolean)
 281:      */
 282:     public boolean isOutline() {
 283:         return this.showOutline;
 284:     }
 285: 
 286:     /**
 287:      * Sets a flag that controls whether or not outlines of the areas are drawn
 288:      * and sends a {@link RendererChangeEvent} to all registered listeners.
 289:      *
 290:      * @param show  the flag.
 291:      * 
 292:      * @see #isOutline()
 293:      */
 294:     public void setOutline(boolean show) {
 295:         this.showOutline = show;
 296:         notifyListeners(new RendererChangeEvent(this));
 297:     }
 298: 
 299:     /**
 300:      * Returns the shape used to represent an area in the legend.
 301:      * 
 302:      * @return The legend area (never <code>null</code>).
 303:      */
 304:     public Shape getLegendArea() {
 305:         return this.legendArea;   
 306:     }
 307:     
 308:     /**
 309:      * Sets the shape used as an area in each legend item and sends a 
 310:      * {@link RendererChangeEvent} to all registered listeners.
 311:      * 
 312:      * @param area  the area (<code>null</code> not permitted).
 313:      */
 314:     public void setLegendArea(Shape area) {
 315:         if (area == null) {
 316:             throw new IllegalArgumentException("Null 'area' argument.");   
 317:         }
 318:         this.legendArea = area;
 319:         notifyListeners(new RendererChangeEvent(this));
 320:     }
 321: 
 322:     /**
 323:      * Initialises the renderer and returns a state object that should be 
 324:      * passed to all subsequent calls to the drawItem() method.
 325:      *
 326:      * @param g2  the graphics device.
 327:      * @param dataArea  the area inside the axes.
 328:      * @param plot  the plot.
 329:      * @param data  the data.
 330:      * @param info  an optional info collection object to return data back to 
 331:      *              the caller.
 332:      *
 333:      * @return A state object for use by the renderer.
 334:      */
 335:     public XYItemRendererState initialise(Graphics2D g2, Rectangle2D dataArea,
 336:             XYPlot plot, XYDataset data, PlotRenderingInfo info) {
 337:         XYAreaRendererState state = new XYAreaRendererState(info);
 338:         return state;
 339:     }
 340: 
 341:     /**
 342:      * Returns a default legend item for the specified series.  Subclasses 
 343:      * should override this method to generate customised items.
 344:      *
 345:      * @param datasetIndex  the dataset index (zero-based).
 346:      * @param series  the series index (zero-based).
 347:      *
 348:      * @return A legend item for the series.
 349:      */
 350:     public LegendItem getLegendItem(int datasetIndex, int series) {
 351:         LegendItem result = null;
 352:         XYPlot xyplot = getPlot();
 353:         if (xyplot != null) {
 354:             XYDataset dataset = xyplot.getDataset(datasetIndex);
 355:             if (dataset != null) {
 356:                 XYSeriesLabelGenerator lg = getLegendItemLabelGenerator();
 357:                 String label = lg.generateLabel(dataset, series);
 358:                 String description = label;
 359:                 String toolTipText = null;
 360:                 if (getLegendItemToolTipGenerator() != null) {
 361:                     toolTipText = getLegendItemToolTipGenerator().generateLabel(
 362:                             dataset, series);
 363:                 }
 364:                 String urlText = null;
 365:                 if (getLegendItemURLGenerator() != null) {
 366:                     urlText = getLegendItemURLGenerator().generateLabel(
 367:                             dataset, series);
 368:                 }
 369:                 Paint paint = getSeriesPaint(series);
 370:                 result = new LegendItem(label, description, toolTipText, 
 371:                         urlText, this.legendArea, paint);
 372:             }
 373:         }
 374:         return result;
 375:     }
 376: 
 377:     /**
 378:      * Draws the visual representation of a single data item.
 379:      *
 380:      * @param g2  the graphics device.
 381:      * @param state  the renderer state.
 382:      * @param dataArea  the area within which the data is being drawn.
 383:      * @param info  collects information about the drawing.
 384:      * @param plot  the plot (can be used to obtain standard color information 
 385:      *              etc).
 386:      * @param domainAxis  the domain axis.
 387:      * @param rangeAxis  the range axis.
 388:      * @param dataset  the dataset.
 389:      * @param series  the series index (zero-based).
 390:      * @param item  the item index (zero-based).
 391:      * @param crosshairState  crosshair information for the plot 
 392:      *                        (<code>null</code> permitted).
 393:      * @param pass  the pass index.
 394:      */
 395:     public void drawItem(Graphics2D g2, XYItemRendererState state,
 396:             Rectangle2D dataArea, PlotRenderingInfo info, XYPlot plot,
 397:             ValueAxis domainAxis, ValueAxis rangeAxis, XYDataset dataset,
 398:             int series, int item, CrosshairState crosshairState, int pass) {
 399:         
 400:         if (!getItemVisible(series, item)) {
 401:             return;   
 402:         }
 403:         XYAreaRendererState areaState = (XYAreaRendererState) state;
 404:         
 405:         // get the data point...
 406:         double x1 = dataset.getXValue(series, item);
 407:         double y1 = dataset.getYValue(series, item);
 408:         if (Double.isNaN(y1)) {
 409:             y1 = 0.0;
 410:         }
 411:         double transX1 = domainAxis.valueToJava2D(x1, dataArea, 
 412:                 plot.getDomainAxisEdge());
 413:         double transY1 = rangeAxis.valueToJava2D(y1, dataArea, 
 414:                 plot.getRangeAxisEdge());
 415:         
 416:         // get the previous point and the next point so we can calculate a 
 417:         // "hot spot" for the area (used by the chart entity)...
 418:         int itemCount = dataset.getItemCount(series);
 419:         double x0 = dataset.getXValue(series, Math.max(item - 1, 0));
 420:         double y0 = dataset.getYValue(series, Math.max(item - 1, 0));
 421:         if (Double.isNaN(y0)) {
 422:             y0 = 0.0;
 423:         }
 424:         double transX0 = domainAxis.valueToJava2D(x0, dataArea, 
 425:                 plot.getDomainAxisEdge());
 426:         double transY0 = rangeAxis.valueToJava2D(y0, dataArea, 
 427:                 plot.getRangeAxisEdge());
 428:         
 429:         double x2 = dataset.getXValue(series, Math.min(item + 1, 
 430:                 itemCount - 1));
 431:         double y2 = dataset.getYValue(series, Math.min(item + 1, 
 432:                 itemCount - 1));
 433:         if (Double.isNaN(y2)) {
 434:             y2 = 0.0;
 435:         }
 436:         double transX2 = domainAxis.valueToJava2D(x2, dataArea, 
 437:                 plot.getDomainAxisEdge());
 438:         double transY2 = rangeAxis.valueToJava2D(y2, dataArea, 
 439:                 plot.getRangeAxisEdge());
 440:         
 441:         double transZero = rangeAxis.valueToJava2D(0.0, dataArea, 
 442:                 plot.getRangeAxisEdge());
 443:         Polygon hotspot = null;
 444:         if (plot.getOrientation() == PlotOrientation.HORIZONTAL) {
 445:             hotspot = new Polygon();
 446:             hotspot.addPoint((int) transZero, 
 447:                     (int) ((transX0 + transX1) / 2.0));
 448:             hotspot.addPoint((int) ((transY0 + transY1) / 2.0), 
 449:                     (int) ((transX0 + transX1) / 2.0));
 450:             hotspot.addPoint((int) transY1, (int) transX1);
 451:             hotspot.addPoint((int) ((transY1 + transY2) / 2.0), 
 452:                     (int) ((transX1 + transX2) / 2.0));
 453:             hotspot.addPoint((int) transZero, 
 454:                     (int) ((transX1 + transX2) / 2.0));
 455:         }
 456:         else {  // vertical orientation
 457:             hotspot = new Polygon();
 458:             hotspot.addPoint((int) ((transX0 + transX1) / 2.0), 
 459:                     (int) transZero);
 460:             hotspot.addPoint((int) ((transX0 + transX1) / 2.0), 
 461:                     (int) ((transY0 + transY1) / 2.0));
 462:             hotspot.addPoint((int) transX1, (int) transY1);
 463:             hotspot.addPoint((int) ((transX1 + transX2) / 2.0), 
 464:                     (int) ((transY1 + transY2) / 2.0));
 465:             hotspot.addPoint((int) ((transX1 + transX2) / 2.0), 
 466:                     (int) transZero);
 467:         }
 468:         
 469:         if (item == 0) {  // create a new area polygon for the series
 470:             areaState.area = new Polygon();
 471:             // the first point is (x, 0)
 472:             double zero = rangeAxis.valueToJava2D(0.0, dataArea, 
 473:                     plot.getRangeAxisEdge());
 474:             if (plot.getOrientation() == PlotOrientation.VERTICAL) {
 475:                 areaState.area.addPoint((int) transX1, (int) zero);
 476:             }
 477:             else if (plot.getOrientation() == PlotOrientation.HORIZONTAL) {
 478:                 areaState.area.addPoint((int) zero, (int) transX1);
 479:             }
 480:         }
 481: 
 482:         // Add each point to Area (x, y)
 483:         if (plot.getOrientation() == PlotOrientation.VERTICAL) {
 484:             areaState.area.addPoint((int) transX1, (int) transY1);
 485:         }
 486:         else if (plot.getOrientation() == PlotOrientation.HORIZONTAL) {
 487:             areaState.area.addPoint((int) transY1, (int) transX1);
 488:         }
 489:         
 490:         PlotOrientation orientation = plot.getOrientation();
 491:         Paint paint = getItemPaint(series, item);
 492:         Stroke stroke = getItemStroke(series, item);
 493:         g2.setPaint(paint);
 494:         g2.setStroke(stroke);
 495:         
 496:         Shape shape = null;
 497:         if (getPlotShapes()) {
 498:             shape = getItemShape(series, item);
 499:             if (orientation == PlotOrientation.VERTICAL) {
 500:                 shape = ShapeUtilities.createTranslatedShape(shape, transX1, 
 501:                         transY1);
 502:             }
 503:             else if (orientation == PlotOrientation.HORIZONTAL) {
 504:                 shape = ShapeUtilities.createTranslatedShape(shape, transY1, 
 505:                         transX1);
 506:             }
 507:             g2.draw(shape);
 508:         }
 509: 
 510:         if (getPlotLines()) {
 511:             if (item > 0) {
 512:                 if (plot.getOrientation() == PlotOrientation.VERTICAL) {
 513:                     areaState.line.setLine(transX0, transY0, transX1, transY1);
 514:                 }
 515:                 else if (plot.getOrientation() == PlotOrientation.HORIZONTAL) {
 516:                     areaState.line.setLine(transY0, transX0, transY1, transX1);
 517:                 }
 518:                 g2.draw(areaState.line);
 519:             }
 520:         }
 521: 
 522:         // Check if the item is the last item for the series.
 523:         // and number of items > 0.  We can't draw an area for a single point.
 524:         if (getPlotArea() && item > 0 && item == (itemCount - 1)) {
 525: 
 526:             if (orientation == PlotOrientation.VERTICAL) {
 527:                 // Add the last point (x,0)
 528:                 areaState.area.addPoint((int) transX1, (int) transZero);
 529:             }
 530:             else if (orientation == PlotOrientation.HORIZONTAL) {
 531:                 // Add the last point (x,0)
 532:                 areaState.area.addPoint((int) transZero, (int) transX1);
 533:             }
 534: 
 535:             g2.fill(areaState.area);
 536: 
 537:             // draw an outline around the Area.
 538:             if (isOutline()) {
 539:                 g2.setStroke(getItemOutlineStroke(series, item));
 540:                 g2.setPaint(getItemOutlinePaint(series, item));
 541:                 g2.draw(areaState.area);
 542:             }
 543:         }
 544: 
 545:         int domainAxisIndex = plot.getDomainAxisIndex(domainAxis);
 546:         int rangeAxisIndex = plot.getRangeAxisIndex(rangeAxis);
 547:         updateCrosshairValues(crosshairState, x1, y1, domainAxisIndex, 
 548:                 rangeAxisIndex, transX1, transY1, orientation);
 549:         
 550:         // collect entity and tool tip information...
 551:         if (state.getInfo() != null) {
 552:             EntityCollection entities = state.getEntityCollection();
 553:             if (entities != null && hotspot != null) {
 554:                 String tip = null;
 555:                 XYToolTipGenerator generator 
 556:                     = getToolTipGenerator(series, item);
 557:                 if (generator != null) {
 558:                     tip = generator.generateToolTip(dataset, series, item);
 559:                 }
 560:                 String url = null;
 561:                 if (getURLGenerator() != null) {
 562:                     url = getURLGenerator().generateURL(dataset, series, item);
 563:                 }
 564:                 XYItemEntity entity = new XYItemEntity(hotspot, dataset, 
 565:                         series, item, tip, url);
 566:                 entities.add(entity);
 567:             }
 568:         }
 569: 
 570:     }
 571: 
 572:     /**
 573:      * Returns a clone of the renderer.
 574:      * 
 575:      * @return A clone.
 576:      * 
 577:      * @throws CloneNotSupportedException  if the renderer cannot be cloned.
 578:      */
 579:     public Object clone() throws CloneNotSupportedException {
 580:         XYAreaRenderer clone = (XYAreaRenderer) super.clone();
 581:         clone.legendArea = ShapeUtilities.clone(this.legendArea);
 582:         return clone;
 583:     }
 584:     
 585:     /**
 586:      * Tests this renderer for equality with an arbitrary object.
 587:      * 
 588:      * @param obj  the object (<code>null</code> permitted).
 589:      * 
 590:      * @return A boolean.
 591:      */
 592:     public boolean equals(Object obj) {
 593:         if (obj == this) {
 594:             return true;   
 595:         }
 596:         if (!(obj instanceof XYAreaRenderer)) {
 597:             return false;   
 598:         }
 599:         XYAreaRenderer that = (XYAreaRenderer) obj;
 600:         if (this.plotArea != that.plotArea) {
 601:             return false;   
 602:         }
 603:         if (this.plotLines != that.plotLines) {
 604:             return false;   
 605:         }
 606:         if (this.plotShapes != that.plotShapes) {
 607:             return false;   
 608:         }
 609:         if (this.showOutline != that.showOutline) {
 610:             return false;   
 611:         }
 612:         if (!ShapeUtilities.equal(this.legendArea, that.legendArea)) {
 613:             return false;   
 614:         }
 615:         return true;
 616:     }
 617:     
 618:     /**
 619:      * Provides serialization support.
 620:      *
 621:      * @param stream  the input stream.
 622:      *
 623:      * @throws IOException  if there is an I/O error.
 624:      * @throws ClassNotFoundException  if there is a classpath problem.
 625:      */
 626:     private void readObject(ObjectInputStream stream) 
 627:             throws IOException, ClassNotFoundException {
 628:         stream.defaultReadObject();
 629:         this.legendArea = SerialUtilities.readShape(stream);
 630:     }
 631:     
 632:     /**
 633:      * Provides serialization support.
 634:      *
 635:      * @param stream  the output stream.
 636:      *
 637:      * @throws IOException  if there is an I/O error.
 638:      */
 639:     private void writeObject(ObjectOutputStream stream) throws IOException {
 640:         stream.defaultWriteObject();
 641:         SerialUtilities.writeShape(this.legendArea, stream);
 642:     }
 643: }