git.gag.com Git - debian/openrocket/blob - src/net/sf/openrocket/gui/scalefigure/RocketPanel.java

   1 package net.sf.openrocket.gui.scalefigure;
   2
   3
   4 import java.awt.Dimension;
   5 import java.awt.Font;
   6 import java.awt.Point;
   7 import java.awt.event.ActionEvent;
   8 import java.awt.event.InputEvent;
   9 import java.awt.event.MouseEvent;
  10 import java.util.ArrayList;
  11 import java.util.Collection;
  12 import java.util.List;
  13 import java.util.concurrent.Executor;
  14 import java.util.concurrent.Executors;
  15 import java.util.concurrent.ThreadFactory;
  16
  17 import javax.swing.AbstractAction;
  18 import javax.swing.Action;
  19 import javax.swing.JComboBox;
  20 import javax.swing.JLabel;
  21 import javax.swing.JPanel;
  22 import javax.swing.JSlider;
  23 import javax.swing.JToggleButton;
  24 import javax.swing.JViewport;
  25 import javax.swing.SwingUtilities;
  26 import javax.swing.event.ChangeEvent;
  27 import javax.swing.event.ChangeListener;
  28 import javax.swing.event.TreeSelectionEvent;
  29 import javax.swing.event.TreeSelectionListener;
  30 import javax.swing.tree.TreePath;
  31 import javax.swing.tree.TreeSelectionModel;
  32
  33 import net.miginfocom.swing.MigLayout;
  34 import net.sf.openrocket.aerodynamics.AerodynamicCalculator;
  35 import net.sf.openrocket.aerodynamics.BarrowmanCalculator;
  36 import net.sf.openrocket.aerodynamics.FlightConditions;
  37 import net.sf.openrocket.aerodynamics.WarningSet;
  38 import net.sf.openrocket.document.OpenRocketDocument;
  39 import net.sf.openrocket.document.Simulation;
  40 import net.sf.openrocket.gui.adaptors.DoubleModel;
  41 import net.sf.openrocket.gui.adaptors.MotorConfigurationModel;
  42 import net.sf.openrocket.gui.components.BasicSlider;
  43 import net.sf.openrocket.gui.components.StageSelector;
  44 import net.sf.openrocket.gui.components.UnitSelector;
  45 import net.sf.openrocket.gui.configdialog.ComponentConfigDialog;
  46 import net.sf.openrocket.gui.figureelements.CGCaret;
  47 import net.sf.openrocket.gui.figureelements.CPCaret;
  48 import net.sf.openrocket.gui.figureelements.Caret;
  49 import net.sf.openrocket.gui.figureelements.RocketInfo;
  50 import net.sf.openrocket.gui.main.ComponentTreeModel;
  51 import net.sf.openrocket.gui.main.SimulationWorker;
  52 import net.sf.openrocket.rocketcomponent.Configuration;
  53 import net.sf.openrocket.rocketcomponent.Rocket;
  54 import net.sf.openrocket.rocketcomponent.RocketComponent;
  55 import net.sf.openrocket.rocketcomponent.SymmetricComponent;
  56 import net.sf.openrocket.simulation.FlightData;
  57 import net.sf.openrocket.simulation.SimulationListener;
  58 import net.sf.openrocket.simulation.listeners.ApogeeEndListener;
  59 import net.sf.openrocket.simulation.listeners.InterruptListener;
  60 import net.sf.openrocket.unit.UnitGroup;
  61 import net.sf.openrocket.util.ChangeSource;
  62 import net.sf.openrocket.util.Coordinate;
  63 import net.sf.openrocket.util.MathUtil;
  64 import net.sf.openrocket.util.Prefs;
  65
  66 /**
  67  * A JPanel that contains a RocketFigure and buttons to manipulate the figure.
  68  *
  69  * @author Sampo Niskanen <sampo.niskanen@iki.fi>
  70  */
  71 public class RocketPanel extends JPanel implements TreeSelectionListener, ChangeSource {
  72
  73         private final RocketFigure figure;
  74         private final ScaleScrollPane scrollPane;
  75
  76         private JLabel infoMessage;
  77
  78         private TreeSelectionModel selectionModel = null;
  79
  80
  81         /* Calculation of CP and CG */
  82         private AerodynamicCalculator calculator;
  83
  84
  85         private final OpenRocketDocument document;
  86         private final Configuration configuration;
  87
  88         private Caret extraCP = null;
  89         private Caret extraCG = null;
  90         private RocketInfo extraText = null;
  91
  92
  93         private double cpAOA = Double.NaN;
  94         private double cpTheta = Double.NaN;
  95         private double cpMach = Double.NaN;
  96         private double cpRoll = Double.NaN;
  97
  98         // The functional ID of the rocket that was simulated
  99         private int flightDataFunctionalID = -1;
 100         private String flightDataMotorID = null;
 101
 102
 103         private SimulationWorker backgroundSimulationWorker = null;
 104
 105
 106         private List<ChangeListener> listeners = new ArrayList<ChangeListener>();
 107
 108
 109         /**
 110          * The executor service used for running the background simulations.
 111          * This uses a fixed-sized thread pool for all background simulations
 112          * with all threads in daemon mode and with minimum priority.
 113          */
 114         private static final Executor backgroundSimulationExecutor;
 115         static {
 116                 backgroundSimulationExecutor = Executors.newFixedThreadPool(Prefs.getMaxThreadCount(),
 117                                 new ThreadFactory() {
 118                         private ThreadFactory factory = Executors.defaultThreadFactory();
 119                         @Override
 120                         public Thread newThread(Runnable r) {
 121                                 Thread t = factory.newThread(r);
 122                                 t.setDaemon(true);
 123                                 t.setPriority(Thread.MIN_PRIORITY);
 124                                 return t;
 125                         }
 126                 });
 127         }
 128
 129
 130         public RocketPanel(OpenRocketDocument document) {
 131
 132                 this.document = document;
 133                 configuration = document.getDefaultConfiguration();
 134
 135                 // TODO: FUTURE: calculator selection
 136                 calculator = new BarrowmanCalculator(configuration);
 137
 138                 // Create figure and custom scroll pane
 139                 figure = new RocketFigure(configuration);
 140
 141                 scrollPane = new ScaleScrollPane(figure) {
 142                         @Override
 143                         public void mouseClicked(MouseEvent event) {
 144                                 handleMouseClick(event);
 145                         }
 146                 };
 147                 scrollPane.getViewport().setScrollMode(JViewport.SIMPLE_SCROLL_MODE);
 148                 scrollPane.setFitting(true);
 149
 150                 createPanel();
 151
 152                 configuration.addChangeListener(new ChangeListener() {
 153                         @Override
 154                         public void stateChanged(ChangeEvent e) {
 155                                 System.out.println("Configuration changed, calling updateFigure");
 156                                 updateExtras();
 157                                 figure.updateFigure();
 158                         }
 159                 });
 160         }
 161
 162
 163         /**
 164          * Creates the layout and components of the panel.
 165          */
 166         private void createPanel() {
 167                 setLayout(new MigLayout("","[shrink][grow]","[shrink][shrink][grow][shrink]"));
 168
 169                 setPreferredSize(new Dimension(800,300));
 170
 171
 172                 //// Create toolbar
 173
 174                 // Side/back buttons
 175                 FigureTypeAction action = new FigureTypeAction(RocketFigure.TYPE_SIDE);
 176                 action.putValue(Action.NAME, "Side view");
 177                 action.putValue(Action.SHORT_DESCRIPTION, "Side view");
 178                 JToggleButton toggle = new JToggleButton(action);
 179                 add(toggle,"spanx, split");
 180
 181                 action = new FigureTypeAction(RocketFigure.TYPE_BACK);
 182                 action.putValue(Action.NAME, "Back view");
 183                 action.putValue(Action.SHORT_DESCRIPTION, "Rear view");
 184                 toggle = new JToggleButton(action);
 185                 add(toggle,"gap rel");
 186
 187
 188                 // Zoom level selector
 189                 ScaleSelector scaleSelector = new ScaleSelector(scrollPane);
 190                 add(scaleSelector);
 191
 192
 193
 194                 // Stage selector
 195                 StageSelector stageSelector = new StageSelector(configuration);
 196                 add(stageSelector,"");
 197
 198
 199
 200                 // Motor configuration selector
 201
 202                 JLabel label = new JLabel("Motor configuration:");
 203                 label.setHorizontalAlignment(JLabel.RIGHT);
 204                 add(label,"growx, right");
 205                 add(new JComboBox(new MotorConfigurationModel(configuration)),"wrap");
 206
 207
 208
 209
 210
 211                 // Create slider and scroll pane
 212
 213                 DoubleModel theta = new DoubleModel(figure,"Rotation",
 214                                 UnitGroup.UNITS_ANGLE,0,2*Math.PI);
 215                 UnitSelector us = new UnitSelector(theta,true);
 216                 us.setHorizontalAlignment(JLabel.CENTER);
 217                 add(us,"alignx 50%, growx");
 218
 219                 // Add the rocket figure
 220                 add(scrollPane,"grow, spany 2, wmin 300lp, hmin 100lp, wrap");
 221
 222
 223                 // Add rotation slider
 224                 // Minimum size to fit "360deg"
 225                 JLabel l = new JLabel("360\u00b0");
 226                 Dimension d = l.getPreferredSize();
 227
 228                 add(new BasicSlider(theta.getSliderModel(0,2*Math.PI),JSlider.VERTICAL,true),
 229                                 "ax 50%, wrap, width "+(d.width+6)+"px:null:null, growy");
 230
 231
 232                 infoMessage = new JLabel("<html>" +
 233                                 "Click to select &nbsp;&nbsp; " +
 234                                 "Shift+click to select other &nbsp;&nbsp; " +
 235                                 "Double-click to edit &nbsp;&nbsp; " +
 236                                 "Click+drag to move");
 237                 infoMessage.setFont(new Font("Sans Serif", Font.PLAIN, 9));
 238                 add(infoMessage,"skip, span, gapleft 25, wrap");
 239
 240                 addExtras();
 241         }
 242
 243
 244
 245         public RocketFigure getFigure() {
 246                 return figure;
 247         }
 248
 249         public AerodynamicCalculator getCalculator() {
 250                 return calculator;
 251         }
 252
 253         public Configuration getConfiguration() {
 254                 return configuration;
 255         }
 256
 257         public void setSelectionModel(TreeSelectionModel m) {
 258                 if (selectionModel != null) {
 259                         selectionModel.removeTreeSelectionListener(this);
 260                 }
 261                 selectionModel = m;
 262                 selectionModel.addTreeSelectionListener(this);
 263                 valueChanged((TreeSelectionEvent)null);   // updates FigureParameters
 264         }
 265
 266
 267
 268         /**
 269          * Return the angle of attack used in CP calculation.  NaN signifies the default value
 270          * of zero.
 271          * @return   the angle of attack used, or NaN.
 272          */
 273         public double getCPAOA() {
 274                 return cpAOA;
 275         }
 276
 277         /**
 278          * Set the angle of attack to be used in CP calculation.  A value of NaN signifies that
 279          * the default AOA (zero) should be used.
 280          * @param aoa   the angle of attack to use, or NaN
 281          */
 282         public void setCPAOA(double aoa) {
 283                 if (MathUtil.equals(aoa, cpAOA) ||
 284                                 (Double.isNaN(aoa) && Double.isNaN(cpAOA)))
 285                         return;
 286                 cpAOA = aoa;
 287                 updateExtras();
 288                 figure.updateFigure();
 289                 fireChangeEvent();
 290         }
 291
 292         public double getCPTheta() {
 293                 return cpTheta;
 294         }
 295
 296         public void setCPTheta(double theta) {
 297                 if (MathUtil.equals(theta, cpTheta) ||
 298                                 (Double.isNaN(theta) && Double.isNaN(cpTheta)))
 299                         return;
 300                 cpTheta = theta;
 301                 if (!Double.isNaN(theta))
 302                         figure.setRotation(theta);
 303                 updateExtras();
 304                 figure.updateFigure();
 305                 fireChangeEvent();
 306         }
 307
 308         public double getCPMach() {
 309                 return cpMach;
 310         }
 311
 312         public void setCPMach(double mach) {
 313                 if (MathUtil.equals(mach, cpMach) ||
 314                                 (Double.isNaN(mach) && Double.isNaN(cpMach)))
 315                         return;
 316                 cpMach = mach;
 317                 updateExtras();
 318                 figure.updateFigure();
 319                 fireChangeEvent();
 320         }
 321
 322         public double getCPRoll() {
 323                 return cpRoll;
 324         }
 325
 326         public void setCPRoll(double roll) {
 327                 if (MathUtil.equals(roll, cpRoll) ||
 328                                 (Double.isNaN(roll) && Double.isNaN(cpRoll)))
 329                         return;
 330                 cpRoll = roll;
 331                 updateExtras();
 332                 figure.updateFigure();
 333                 fireChangeEvent();
 334         }
 335
 336
 337
 338         @Override
 339         public void addChangeListener(ChangeListener listener) {
 340                 listeners.add(0,listener);
 341         }
 342         @Override
 343         public void removeChangeListener(ChangeListener listener) {
 344                 listeners.remove(listener);
 345         }
 346
 347         protected void fireChangeEvent() {
 348                 ChangeEvent e = new ChangeEvent(this);
 349                 ChangeListener[] list = listeners.toArray(new ChangeListener[0]);
 350                 for (ChangeListener l: list) {
 351                         l.stateChanged(e);
 352                 }
 353         }
 354
 355
 356
 357
 358         /**
 359          * Handle clicking on figure shapes.  The functioning is the following:
 360          *
 361          * Get the components clicked.
 362          * If no component is clicked, do nothing.
 363          * If the currently selected component is in the set, keep it,
 364          * unless the selector specified is pressed.  If it is pressed, cycle to
 365          * the next component. Otherwise select the first component in the list.
 366          */
 367         public static final int CYCLE_SELECTION_MODIFIER = InputEvent.SHIFT_DOWN_MASK;
 368
 369         private void handleMouseClick(MouseEvent event) {
 370                 if (event.getButton() != MouseEvent.BUTTON1)
 371                         return;
 372                 Point p0 = event.getPoint();
 373                 Point p1 = scrollPane.getViewport().getViewPosition();
 374                 int x = p0.x + p1.x;
 375                 int y = p0.y + p1.y;
 376
 377                 RocketComponent[] clicked = figure.getComponentsByPoint(x, y);
 378
 379                 // If no component is clicked, do nothing
 380                 if (clicked.length == 0)
 381                         return;
 382
 383                 // Check whether the currently selected component is in the clicked components.
 384                 TreePath path = selectionModel.getSelectionPath();
 385                 if (path != null) {
 386                         RocketComponent current = (RocketComponent)path.getLastPathComponent();
 387                         path = null;
 388                         for (int i=0; i<clicked.length; i++) {
 389                                 if (clicked[i] == current) {
 390                                         if (event.isShiftDown() && (event.getClickCount()==1)) {
 391                                                 path = ComponentTreeModel.makeTreePath(clicked[(i+1)%clicked.length]);
 392                                         } else {
 393                                                 path = ComponentTreeModel.makeTreePath(clicked[i]);
 394                                         }
 395                                         break;
 396                                 }
 397                         }
 398                 }
 399
 400                 // Currently selected component not clicked
 401                 if (path == null) {
 402                         if (event.isShiftDown() && event.getClickCount()==1 && clicked.length>1) {
 403                                 path = ComponentTreeModel.makeTreePath(clicked[1]);
 404                         } else {
 405                                 path = ComponentTreeModel.makeTreePath(clicked[0]);
 406                         }
 407                 }
 408
 409                 // Set selection and check for double-click
 410                 selectionModel.setSelectionPath(path);
 411                 if (event.getClickCount() == 2) {
 412                         RocketComponent component = (RocketComponent)path.getLastPathComponent();
 413
 414                         ComponentConfigDialog.showDialog(SwingUtilities.getWindowAncestor(this),
 415                                         document, component);
 416                 }
 417         }
 418
 419
 420
 421
 422         /**
 423          * Updates the extra data included in the figure.  Currently this includes
 424          * the CP and CG carets.
 425          */
 426         private WarningSet warnings = new WarningSet();
 427         private void updateExtras() {
 428                 Coordinate cp,cg;
 429                 double cpx, cgx;
 430
 431                 // TODO: MEDIUM: User-definable conditions
 432                 FlightConditions conditions = new FlightConditions(configuration);
 433                 warnings.clear();
 434
 435                 if (!Double.isNaN(cpMach)) {
 436                         conditions.setMach(cpMach);
 437                         extraText.setMach(cpMach);
 438                 } else {
 439                         conditions.setMach(Prefs.getDefaultMach());
 440                         extraText.setMach(Prefs.getDefaultMach());
 441                 }
 442
 443                 if (!Double.isNaN(cpAOA)) {
 444                         conditions.setAOA(cpAOA);
 445                 } else {
 446                         conditions.setAOA(0);
 447                 }
 448                 extraText.setAOA(cpAOA);
 449
 450                 if (!Double.isNaN(cpRoll)) {
 451                         conditions.setRollRate(cpRoll);
 452                 } else {
 453                         conditions.setRollRate(0);
 454                 }
 455
 456                 if (!Double.isNaN(cpTheta)) {
 457                         conditions.setTheta(cpTheta);
 458                         cp = calculator.getCP(conditions, warnings);
 459                 } else {
 460                         cp = calculator.getWorstCP(conditions, warnings);
 461                 }
 462                 extraText.setTheta(cpTheta);
 463
 464
 465                 cg = calculator.getCG(0);
 466 //              System.out.println("CG computed as "+cg+ " CP as "+cp);
 467
 468                 if (cp.weight > 0.000001)
 469                         cpx = cp.x;
 470                 else
 471                         cpx = Double.NaN;
 472
 473                 if (cg.weight > 0.000001)
 474                         cgx = cg.x;
 475                 else
 476                         cgx = Double.NaN;
 477
 478                 // Length bound is assumed to be tight
 479                 double length = 0, diameter = 0;
 480                 Collection<Coordinate> bounds = configuration.getBounds();
 481                 if (!bounds.isEmpty()) {
 482                         double minX = Double.POSITIVE_INFINITY, maxX = Double.NEGATIVE_INFINITY;
 483                         for (Coordinate c: bounds) {
 484                                 if (c.x < minX)
 485                                         minX = c.x;
 486                                 if (c.x > maxX)
 487                                         maxX = c.x;
 488                         }
 489                         length = maxX - minX;
 490                 }
 491
 492                 for (RocketComponent c: configuration) {
 493                         if (c instanceof SymmetricComponent) {
 494                                 double d1 = ((SymmetricComponent)c).getForeRadius() * 2;
 495                                 double d2 = ((SymmetricComponent)c).getAftRadius() * 2;
 496                                 diameter = MathUtil.max(diameter, d1, d2);
 497                         }
 498                 }
 499
 500                 extraText.setCG(cgx);
 501                 extraText.setCP(cpx);
 502                 extraText.setLength(length);
 503                 extraText.setDiameter(diameter);
 504                 extraText.setMass(cg.weight);
 505                 extraText.setWarnings(warnings);
 506
 507
 508                 if (figure.getType() == RocketFigure.TYPE_SIDE && length > 0) {
 509
 510                         // TODO: LOW: Y-coordinate and rotation
 511                         extraCP.setPosition(cpx * RocketFigure.EXTRA_SCALE, 0);
 512                         extraCG.setPosition(cgx * RocketFigure.EXTRA_SCALE, 0);
 513
 514                 } else {
 515
 516                         extraCP.setPosition(Double.NaN, Double.NaN);
 517                         extraCG.setPosition(Double.NaN, Double.NaN);
 518
 519                 }
 520
 521
 522                 ////////  Flight simulation in background
 523
 524                 // Check whether to compute or not
 525                 if (!Prefs.computeFlightInBackground()) {
 526                         extraText.setFlightData(null);
 527                         extraText.setCalculatingData(false);
 528                         stopBackgroundSimulation();
 529                         return;
 530                 }
 531
 532                 // Check whether data is already up to date
 533                 if (flightDataFunctionalID == configuration.getRocket().getFunctionalModID() &&
 534                                 flightDataMotorID == configuration.getMotorConfigurationID()) {
 535                         return;
 536                 }
 537
 538                 flightDataFunctionalID = configuration.getRocket().getFunctionalModID();
 539                 flightDataMotorID = configuration.getMotorConfigurationID();
 540
 541                 // Stop previous computation (if any)
 542                 stopBackgroundSimulation();
 543
 544                 // Check that configuration has motors
 545                 if (!configuration.hasMotors()) {
 546                         extraText.setFlightData(FlightData.NaN_DATA);
 547                         extraText.setCalculatingData(false);
 548                         return;
 549                 }
 550
 551                 // Start calculation process
 552                 extraText.setCalculatingData(true);
 553
 554                 Rocket duplicate = configuration.getRocket().copy();
 555                 Simulation simulation = Prefs.getBackgroundSimulation(duplicate);
 556                 simulation.getConditions().setMotorConfigurationID(
 557                                 configuration.getMotorConfigurationID());
 558
 559                 backgroundSimulationWorker = new BackgroundSimulationWorker(simulation);
 560                 backgroundSimulationExecutor.execute(backgroundSimulationWorker);
 561         }
 562
 563         /**
 564          * Cancels the current background simulation worker, if any.
 565          */
 566         private void stopBackgroundSimulation() {
 567                 if (backgroundSimulationWorker != null) {
 568                         backgroundSimulationWorker.cancel(true);
 569                         backgroundSimulationWorker = null;
 570                 }
 571         }
 572
 573
 574         /**
 575          * A SimulationWorker that simulates the rocket flight in the background and
 576          * sets the results to the extra text when finished.  The worker can be cancelled
 577          * if necessary.
 578          */
 579         private class BackgroundSimulationWorker extends SimulationWorker {
 580
 581                 public BackgroundSimulationWorker(Simulation sim) {
 582                         super(sim);
 583                 }
 584
 585                 @Override
 586                 protected FlightData doInBackground() {
 587
 588                         // Pause a little while to allow faster UI reaction
 589                         try {
 590                                 Thread.sleep(300);
 591                         } catch (InterruptedException ignore) { }
 592                         if (isCancelled() || backgroundSimulationWorker != this)
 593                                 return null;
 594
 595                         return super.doInBackground();
 596                 }
 597
 598                 @Override
 599                 protected void simulationDone() {
 600                         // Do nothing if cancelled
 601                         if (isCancelled() || backgroundSimulationWorker != this)  // Double-check
 602                                 return;
 603
 604                         backgroundSimulationWorker = null;
 605                         extraText.setFlightData(simulation.getSimulatedData());
 606                         extraText.setCalculatingData(false);
 607                         figure.repaint();
 608                 }
 609
 610                 @Override
 611                 protected SimulationListener[] getExtraListeners() {
 612                         return new SimulationListener[] {
 613                                         InterruptListener.INSTANCE,
 614                                         ApogeeEndListener.INSTANCE
 615                         };
 616                 }
 617
 618                 @Override
 619                 protected void simulationInterrupted(Throwable t) {
 620                         // Do nothing on cancel, set N/A data otherwise
 621                         if (isCancelled() || backgroundSimulationWorker != this)  // Double-check
 622                                 return;
 623
 624                         backgroundSimulationWorker = null;
 625                         extraText.setFlightData(FlightData.NaN_DATA);
 626                         extraText.setCalculatingData(false);
 627                         figure.repaint();
 628                 }
 629         }
 630
 631
 632
 633         /**
 634          * Adds the extra data to the figure.  Currently this includes the CP and CG carets.
 635          */
 636         private void addExtras() {
 637                 figure.clearRelativeExtra();
 638                 extraCG = new CGCaret(0,0);
 639                 extraCP = new CPCaret(0,0);
 640                 extraText = new RocketInfo(configuration);
 641                 updateExtras();
 642                 figure.addRelativeExtra(extraCP);
 643                 figure.addRelativeExtra(extraCG);
 644                 figure.addAbsoluteExtra(extraText);
 645         }
 646
 647
 648         /**
 649          * Updates the selection in the FigureParameters and repaints the figure.
 650          * Ignores the event itself.
 651          */
 652         public void valueChanged(TreeSelectionEvent e) {
 653                 TreePath[] paths = selectionModel.getSelectionPaths();
 654                 if (paths==null) {
 655                         figure.setSelection(null);
 656                         return;
 657                 }
 658
 659                 RocketComponent[] components = new RocketComponent[paths.length];
 660                 for (int i=0; i<paths.length; i++)
 661                         components[i] = (RocketComponent)paths[i].getLastPathComponent();
 662                 figure.setSelection(components);
 663         }
 664
 665
 666
 667         /**
 668          * An <code>Action</code> that shows whether the figure type is the type
 669          * given in the constructor.
 670          *
 671          * @author Sampo Niskanen <sampo.niskanen@iki.fi>
 672          */
 673         private class FigureTypeAction extends AbstractAction implements ChangeListener {
 674                 private final int type;
 675
 676                 public FigureTypeAction(int type) {
 677                         this.type = type;
 678                         stateChanged(null);
 679                         figure.addChangeListener(this);
 680                 }
 681
 682                 public void actionPerformed(ActionEvent e) {
 683                         boolean state = (Boolean)getValue(Action.SELECTED_KEY);
 684                         if (state == true) {
 685                                 // This view has been selected
 686                                 figure.setType(type);
 687                                 updateExtras();
 688                         }
 689                         stateChanged(null);
 690                 }
 691
 692                 public void stateChanged(ChangeEvent e) {
 693                         putValue(Action.SELECTED_KEY,figure.getType() == type);
 694                 }
 695         }
 696
 697 }