tim/prune/threedee/Java3DWindow.java

   1 package tim.prune.threedee;
   2
   3 import java.awt.FlowLayout;
   4 import java.awt.BorderLayout;
   5 import java.awt.Font;
   6 import java.awt.GraphicsConfiguration;
   7 import java.awt.GraphicsEnvironment;
   8 import java.awt.event.ActionEvent;
   9 import java.awt.event.ActionListener;
  10 import java.awt.geom.GeneralPath;
  11
  12 import javax.media.j3d.AmbientLight;
  13 import javax.media.j3d.Appearance;
  14 import javax.media.j3d.BoundingSphere;
  15 import javax.media.j3d.BranchGroup;
  16 import javax.media.j3d.Canvas3D;
  17 import javax.media.j3d.Font3D;
  18 import javax.media.j3d.FontExtrusion;
  19 import javax.media.j3d.GraphicsConfigTemplate3D;
  20 import javax.media.j3d.Group;
  21 import javax.media.j3d.Material;
  22 import javax.media.j3d.PointLight;
  23 import javax.media.j3d.Shape3D;
  24 import javax.media.j3d.Text3D;
  25 import javax.media.j3d.Transform3D;
  26 import javax.media.j3d.TransformGroup;
  27 import javax.swing.JButton;
  28 import javax.swing.JFrame;
  29 import javax.swing.JOptionPane;
  30 import javax.swing.JPanel;
  31 import javax.vecmath.Color3f;
  32 import javax.vecmath.Matrix3d;
  33 import javax.vecmath.Point3d;
  34 import javax.vecmath.Point3f;
  35 import javax.vecmath.Vector3d;
  36
  37 import com.sun.j3d.utils.behaviors.vp.OrbitBehavior;
  38 import com.sun.j3d.utils.geometry.Box;
  39 import com.sun.j3d.utils.geometry.Cylinder;
  40 import com.sun.j3d.utils.geometry.Sphere;
  41 import com.sun.j3d.utils.universe.SimpleUniverse;
  42
  43 import tim.prune.App;
  44 import tim.prune.I18nManager;
  45 import tim.prune.data.Altitude;
  46 import tim.prune.data.Track;
  47
  48
  49 /**
  50  * Class to hold main window for java3d view of data
  51  */
  52 public class Java3DWindow implements ThreeDWindow
  53 {
  54         private App _app = null;
  55         private Track _track = null;
  56         private JFrame _parentFrame = null;
  57         private JFrame _frame = null;
  58         private ThreeDModel _model = null;
  59         private OrbitBehavior _orbit = null;
  60         private int _altitudeCap = ThreeDModel.MINIMUM_ALTITUDE_CAP;
  61
  62         /** only prompt about big track size once */
  63         private static boolean TRACK_SIZE_WARNING_GIVEN = false;
  64
  65         // Constants
  66         private static final double INITIAL_Y_ROTATION = -25.0;
  67         private static final double INITIAL_X_ROTATION = 15.0;
  68         private static final String CARDINALS_FONT = "Arial";
  69         private static final int MAX_TRACK_SIZE = 2500; // threshold for warning
  70
  71
  72         /**
  73          * Constructor
  74          * @param inApp App object to use for callbacks
  75          * @param inFrame parent frame
  76          */
  77         public Java3DWindow(App inApp, JFrame inFrame)
  78         {
  79                 _app = inApp;
  80                 _parentFrame = inFrame;
  81         }
  82
  83
  84         /**
  85          * Set the track object
  86          * @param inTrack Track object
  87          */
  88         public void setTrack(Track inTrack)
  89         {
  90                 _track = inTrack;
  91         }
  92
  93
  94         /**
  95          * Show the window
  96          */
  97         public void show() throws ThreeDException
  98         {
  99                 // Get the altitude cap to use
 100                 String altitudeUnits = getAltitudeUnitsLabel(_track);
 101                 Object altCapString = JOptionPane.showInputDialog(_parentFrame,
 102                         I18nManager.getText("dialog.3d.altitudecap") + " (" + altitudeUnits + ")",
 103                         I18nManager.getText("dialog.3d.title"),
 104                         JOptionPane.QUESTION_MESSAGE, null, null, "" + _altitudeCap);
 105                 if (altCapString == null) return;
 106                 try
 107                 {
 108                         _altitudeCap = Integer.parseInt(altCapString.toString());
 109                 }
 110                 catch (Exception e) {} // Ignore parse errors
 111
 112                 // Set up the graphics config
 113                 GraphicsConfiguration config = SimpleUniverse.getPreferredConfiguration();
 114                 if (config == null)
 115                 {
 116                         // Config shouldn't be null, but we can try to create a new one as a workaround
 117                         GraphicsConfigTemplate3D gc = new GraphicsConfigTemplate3D();
 118                         gc.setDepthSize(0);
 119                         config = GraphicsEnvironment.getLocalGraphicsEnvironment().getDefaultScreenDevice().getBestConfiguration(gc);
 120                 }
 121
 122                 if (config == null)
 123                 {
 124                         // Second attempt also failed, going to have to give up here.
 125                         throw new ThreeDException("Couldn't create graphics config");
 126                 }
 127
 128                 // Check number of points in model isn't too big, and suggest compression
 129                 Object[] buttonTexts = {I18nManager.getText("button.continue"), I18nManager.getText("button.cancel")};
 130                 if (_track.getNumPoints() > MAX_TRACK_SIZE && !TRACK_SIZE_WARNING_GIVEN)
 131                 {
 132                         if (JOptionPane.showOptionDialog(_frame,
 133                                         I18nManager.getText("dialog.exportpov.warningtracksize"),
 134                                         I18nManager.getText("dialog.exportpov.title"), JOptionPane.OK_CANCEL_OPTION,
 135                                         JOptionPane.WARNING_MESSAGE, null, buttonTexts, buttonTexts[1])
 136                                 == JOptionPane.OK_OPTION)
 137                         {
 138                                 // opted to continue, don't show warning again
 139                                 TRACK_SIZE_WARNING_GIVEN = true;
 140                         }
 141                         else
 142                         {
 143                                 // opted to cancel - show warning again next time
 144                                 return;
 145                         }
 146                 }
 147
 148                 Canvas3D canvas = new Canvas3D(config);
 149                 canvas.setSize(400, 300);
 150
 151                 // Create the scene and attach it to the virtual universe
 152                 BranchGroup scene = createSceneGraph();
 153                 SimpleUniverse u = new SimpleUniverse(canvas);
 154
 155                 // This will move the ViewPlatform back a bit so the
 156                 // objects in the scene can be viewed.
 157                 u.getViewingPlatform().setNominalViewingTransform();
 158
 159                 // Add behaviour to rotate using mouse
 160                 _orbit = new OrbitBehavior(canvas, OrbitBehavior.REVERSE_ALL |
 161                                                                   OrbitBehavior.STOP_ZOOM);
 162                 BoundingSphere bounds = new BoundingSphere(new Point3d(0.0,0.0,0.0), 100.0);
 163                 _orbit.setSchedulingBounds(bounds);
 164                 u.getViewingPlatform().setViewPlatformBehavior(_orbit);
 165                 u.addBranchGraph(scene);
 166
 167                 // Don't reuse _frame object from last time, because data and/or scale might be different
 168                 // Need to regenerate everything
 169                 _frame = new JFrame(I18nManager.getText("dialog.3d.title"));
 170                 _frame.getContentPane().setLayout(new BorderLayout());
 171                 _frame.getContentPane().add(canvas, BorderLayout.CENTER);
 172                 // Make panel for render, close buttons
 173                 JPanel panel = new JPanel();
 174                 panel.setLayout(new FlowLayout(FlowLayout.RIGHT));
 175                 // Add callback button for render
 176                 JButton renderButton = new JButton(I18nManager.getText("menu.file.exportpov"));
 177                 renderButton.addActionListener(new ActionListener()
 178                 {
 179                         /** Render button pressed */
 180                         public void actionPerformed(ActionEvent e)
 181                         {
 182                                 if (_orbit != null)
 183                                 {
 184                                         callbackRender();
 185                                 }
 186                         }});
 187                 panel.add(renderButton);
 188                 // Display coordinates of lat/long lines of 3d graph in separate dialog
 189                 JButton showLinesButton = new JButton(I18nManager.getText("button.showlines"));
 190                 showLinesButton.addActionListener(new ActionListener() {
 191                         public void actionPerformed(ActionEvent e)
 192                         {
 193                                 double[] latLines = _model.getLatitudeLines();
 194                                 double[] lonLines = _model.getLongitudeLines();
 195                                 LineDialog dialog = new LineDialog(_frame, latLines, lonLines);
 196                                 dialog.showDialog();
 197                         }
 198                 });
 199                 panel.add(showLinesButton);
 200                 // Close button
 201                 JButton closeButton = new JButton(I18nManager.getText("button.close"));
 202                 closeButton.addActionListener(new ActionListener()
 203                 {
 204                         /** Close button pressed - clean up */
 205                         public void actionPerformed(ActionEvent e)
 206                         {
 207                                 _frame.dispose();
 208                                 _frame = null;
 209                                 _orbit = null;
 210                         }});
 211                 panel.add(closeButton);
 212                 _frame.getContentPane().add(panel, BorderLayout.SOUTH);
 213                 _frame.setSize(500, 350);
 214                 _frame.pack();
 215
 216                 // show frame
 217                 _frame.show();
 218                 if (_frame.getState() == JFrame.ICONIFIED)
 219                 {
 220                         _frame.setState(JFrame.NORMAL);
 221                 }
 222         }
 223
 224
 225         /**
 226          * Create the whole scenery from the given track
 227          * @return all objects in the scene
 228          */
 229         private BranchGroup createSceneGraph()
 230         {
 231                 // Create the root of the branch graph
 232                 BranchGroup objRoot = new BranchGroup();
 233
 234                 // Create the transform group node and initialize it.
 235                 // Enable the TRANSFORM_WRITE capability so it can be spun by the mouse
 236                 TransformGroup objTrans = new TransformGroup();
 237                 objTrans.setCapability(TransformGroup.ALLOW_TRANSFORM_WRITE);
 238
 239                 // Create a translation
 240                 Transform3D shiftz = new Transform3D();
 241                 shiftz.setScale(0.055);
 242                 TransformGroup shiftTrans = new TransformGroup(shiftz);
 243
 244                 objRoot.addChild(shiftTrans);
 245                 Transform3D rotTrans = new Transform3D();
 246                 rotTrans.rotY(Math.toRadians(INITIAL_Y_ROTATION));
 247                 Transform3D rot2 = new Transform3D();
 248                 rot2.rotX(Math.toRadians(INITIAL_X_ROTATION));
 249                 TransformGroup tg2 = new TransformGroup(rot2);
 250                 objTrans.setTransform(rotTrans);
 251                 shiftTrans.addChild(tg2);
 252                 tg2.addChild(objTrans);
 253
 254                 // Base plane
 255                 Appearance planeAppearance = null;
 256                 Box plane = null;
 257                 planeAppearance = new Appearance();
 258                 planeAppearance.setMaterial(new Material(new Color3f(0.1f, 0.2f, 0.2f),
 259                  new Color3f(0.0f, 0.0f, 0.0f), new Color3f(0.3f, 0.4f, 0.4f),
 260                  new Color3f(0.3f, 0.3f, 0.3f), 0.0f));
 261                 plane = new Box(10f, 0.04f, 10f, planeAppearance);
 262                 objTrans.addChild(plane);
 263
 264                 // N, S, E, W
 265                 GeneralPath bevelPath = new GeneralPath();
 266                 bevelPath.moveTo(0.0f, 0.0f);
 267                 for (int i=0; i<91; i+= 5)
 268                         bevelPath.lineTo((float) (0.1 - 0.1 * Math.cos(Math.toRadians(i))),
 269                           (float) (0.1 * Math.sin(Math.toRadians(i))));
 270                 for (int i=90; i>0; i-=5)
 271                         bevelPath.lineTo((float) (0.3 + 0.1 * Math.cos(Math.toRadians(i))),
 272                           (float) (0.1 * Math.sin(Math.toRadians(i))));
 273                 Font3D compassFont = new Font3D(
 274                         new Font(CARDINALS_FONT, Font.PLAIN, 1),
 275                         new FontExtrusion(bevelPath));
 276                 objTrans.addChild(createCompassPoint(I18nManager.getText("cardinal.n"), new Point3f(0f, 0f, -10f), compassFont));
 277                 objTrans.addChild(createCompassPoint(I18nManager.getText("cardinal.s"), new Point3f(0f, 0f, 10f), compassFont));
 278                 objTrans.addChild(createCompassPoint(I18nManager.getText("cardinal.w"), new Point3f(-11f, 0f, 0f), compassFont));
 279                 objTrans.addChild(createCompassPoint(I18nManager.getText("cardinal.e"), new Point3f(10f, 0f, 0f), compassFont));
 280
 281                 // create and scale model
 282                 _model = new ThreeDModel(_track);
 283                 _model.setAltitudeCap(_altitudeCap);
 284                 _model.scale();
 285
 286                 // Lat/Long lines
 287                 objTrans.addChild(createLatLongs(_model));
 288
 289                 // Add points to model
 290                 objTrans.addChild(createDataPoints(_model));
 291
 292                 // Create lights
 293                 BoundingSphere bounds =
 294                   new BoundingSphere(new Point3d(0.0,0.0,0.0), 100.0);
 295                 AmbientLight aLgt = new AmbientLight(new Color3f(1.0f, 1.0f, 1.0f));
 296                 aLgt.setInfluencingBounds(bounds);
 297                 objTrans.addChild(aLgt);
 298
 299                 PointLight pLgt = new PointLight(new Color3f(1.0f, 1.0f, 1.0f),
 300                  new Point3f(0f, 0f, 2f),
 301                  new Point3f(0.25f, 0.05f, 0.0f) );
 302                 pLgt.setInfluencingBounds(bounds);
 303                 objTrans.addChild(pLgt);
 304
 305                 PointLight pl2 = new PointLight(new Color3f(0.8f, 0.9f, 0.4f),
 306                  new Point3f(6f, 1f, 6f),
 307                  new Point3f(0.2f, 0.1f, 0.05f) );
 308                 pl2.setInfluencingBounds(bounds);
 309                 objTrans.addChild(pl2);
 310
 311                 PointLight pl3 = new PointLight(new Color3f(0.7f, 0.7f, 0.7f),
 312                  new Point3f(0.0f, 12f, -2f),
 313                  new Point3f(0.1f, 0.1f, 0.0f) );
 314                 pl3.setInfluencingBounds(bounds);
 315                 objTrans.addChild(pl3);
 316
 317                 // Have Java 3D perform optimizations on this scene graph.
 318                 objRoot.compile();
 319
 320                 return objRoot;
 321         }
 322
 323
 324         /**
 325          * Create a text object for compass point, N S E or W
 326          * @param text text to display
 327          * @param locn position at which to display
 328          * @param font 3d font to use
 329          * @return Shape3D object
 330          */
 331         private Shape3D createCompassPoint(String inText, Point3f inLocn, Font3D inFont)
 332         {
 333                 Text3D txt = new Text3D(inFont, inText, inLocn, Text3D.ALIGN_FIRST, Text3D.PATH_RIGHT);
 334                 Material mat = new Material(new Color3f(0.5f, 0.5f, 0.55f),
 335                  new Color3f(0.05f, 0.05f, 0.1f), new Color3f(0.3f, 0.4f, 0.5f),
 336                  new Color3f(0.4f, 0.5f, 0.7f), 70.0f);
 337                 mat.setLightingEnable(true);
 338                 Appearance app = new Appearance();
 339                 app.setMaterial(mat);
 340                 Shape3D shape = new Shape3D(txt, app);
 341                 return shape;
 342         }
 343
 344
 345         /**
 346          * Create all the latitude and longitude lines on the base plane
 347          * @param inModel model containing data
 348          * @return Group object containing cylinders for lat and long lines
 349          */
 350         private static Group createLatLongs(ThreeDModel inModel)
 351         {
 352                 Group group = new Group();
 353                 int numlines = inModel.getLatitudeLines().length;
 354                 for (int i=0; i<numlines; i++)
 355                 {
 356                         group.addChild(createLatLine(inModel.getScaledLatitudeLine(i), inModel.getModelSize()));
 357                 }
 358                 numlines = inModel.getLongitudeLines().length;
 359                 for (int i=0; i<numlines; i++)
 360                 {
 361                         group.addChild(createLonLine(inModel.getScaledLongitudeLine(i), inModel.getModelSize()));
 362                 }
 363                 return group;
 364         }
 365
 366
 367         /**
 368          * Make a single latitude line for the specified latitude
 369          * @param inLatitude latitude in scaled units
 370          * @param inSize size of model, for length of line
 371          * @return Group object containing cylinder for latitude line
 372          */
 373         private static Group createLatLine(double inLatitude, double inSize)
 374         {
 375                 Cylinder latline = new Cylinder(0.1f, (float) (inSize*2));
 376                 Transform3D horizShift = new Transform3D();
 377                 horizShift.setTranslation(new Vector3d(0.0, 0.0, inLatitude));
 378                 TransformGroup horizTrans = new TransformGroup(horizShift);
 379                 Transform3D zRot = new Transform3D();
 380                 zRot.rotZ(Math.toRadians(90.0));
 381                 TransformGroup zTrans = new TransformGroup(zRot);
 382                 horizTrans.addChild(zTrans);
 383                 zTrans.addChild(latline);
 384                 return horizTrans;
 385         }
 386
 387
 388         /**
 389          * Make a single longitude line for the specified longitude
 390          * @param inLongitude longitude in scaled units
 391          * @param inSize size of model, for length of line
 392          * @return Group object containing cylinder for longitude line
 393          */
 394         private static Group createLonLine(double inLongitude, double inSize)
 395         {
 396                 Cylinder lonline = new Cylinder(0.1f, (float) (inSize*2));
 397                 Transform3D horizShift = new Transform3D();
 398                 horizShift.setTranslation(new Vector3d(inLongitude, 0.0, 0.0));
 399                 TransformGroup horizTrans = new TransformGroup(horizShift);
 400                 Transform3D xRot = new Transform3D();
 401                 xRot.rotX(Math.toRadians(90.0));
 402                 TransformGroup xTrans = new TransformGroup(xRot);
 403                 horizTrans.addChild(xTrans);
 404                 xTrans.addChild(lonline);
 405                 return horizTrans;
 406         }
 407
 408
 409         /**
 410          * Make a Group of the data points to be added
 411          * @param inModel model containing data
 412          * @return Group object containing spheres, rods etc
 413          */
 414         private static Group createDataPoints(ThreeDModel inModel)
 415         {
 416                 // Add points to model
 417                 Group group = new Group();
 418                 int numPoints = inModel.getNumPoints();
 419                 for (int i=0; i<numPoints; i++)
 420                 {
 421                         byte pointType = inModel.getPointType(i);
 422                         if (pointType == ThreeDModel.POINT_TYPE_WAYPOINT)
 423                         {
 424                                 // Add waypoint
 425                                 // Note that x, y and z are horiz, altitude, -vert
 426                                 group.addChild(createWaypoint(new Point3d(
 427                                         inModel.getScaledHorizValue(i), inModel.getScaledAltValue(i), -inModel.getScaledVertValue(i))));
 428                         }
 429                         else
 430                         {
 431                                 // Add colour-coded track point
 432                                 // Note that x, y and z are horiz, altitude, -vert
 433                                 group.addChild(createTrackpoint(new Point3d(
 434                                         inModel.getScaledHorizValue(i), inModel.getScaledAltValue(i), -inModel.getScaledVertValue(i)),
 435                                         inModel.getPointHeightCode(i)));
 436                         }
 437                 }
 438                 return group;
 439         }
 440
 441
 442         /**
 443          * Create a waypoint sphere
 444          * @param inPointPos position of point
 445          * @return Group object containing sphere
 446          */
 447         private static Group createWaypoint(Point3d inPointPos)
 448         {
 449                 Material mat = getWaypointMaterial();
 450                 // TODO: sort symbol scaling
 451                 Sphere dot = new Sphere(0.35f); // * symbolScaling / 100f);
 452                 return createBall(inPointPos, dot, mat);
 453         }
 454
 455
 456         /**
 457          * @return a new Material object to define waypoint colour / shine etc
 458          */
 459         private static Material getWaypointMaterial()
 460         {
 461                 return new Material(new Color3f(0.1f, 0.1f, 0.4f),
 462                          new Color3f(0.0f, 0.0f, 0.0f), new Color3f(0.0f, 0.2f, 0.7f),
 463                          new Color3f(1.0f, 0.6f, 0.6f), 40.0f);
 464         }
 465
 466
 467         private static Group createTrackpoint(Point3d inPointPos, byte inHeightCode)
 468         {
 469                 Material mat = getTrackpointMaterial(inHeightCode);
 470                 // TODO: sort symbol scaling
 471                 Sphere dot = new Sphere(0.2f); // * symbolScaling / 100f);
 472                 return createBall(inPointPos, dot, mat);
 473         }
 474
 475
 476         private static Material getTrackpointMaterial(byte inHeightCode)
 477         {
 478                 // create default material
 479                 Material mat = new Material(new Color3f(0.3f, 0.2f, 0.1f),
 480                         new Color3f(0.0f, 0.0f, 0.0f), new Color3f(0.0f, 0.6f, 0.0f),
 481                         new Color3f(1.0f, 0.6f, 0.6f), 70.0f);
 482                 // change colour according to height code
 483                 if (inHeightCode == 1) mat.setDiffuseColor(new Color3f(0.4f, 0.9f, 0.2f));
 484                 if (inHeightCode == 2) mat.setDiffuseColor(new Color3f(0.7f, 0.8f, 0.2f));
 485                 if (inHeightCode == 3) mat.setDiffuseColor(new Color3f(0.5f, 0.85f, 0.95f));
 486                 if (inHeightCode == 4) mat.setDiffuseColor(new Color3f(0.1f, 0.9f, 0.9f));
 487                 if (inHeightCode >= 5) mat.setDiffuseColor(new Color3f(1.0f, 1.0f, 1.0f));
 488                 // return object
 489                 return mat;
 490         }
 491
 492
 493         /**
 494          * Create a ball at the given point
 495          * @param inPosition scaled position of point
 496          * @param inSphere sphere object
 497          * @param inMaterial material object
 498          * @return Group containing sphere
 499          */
 500         private static Group createBall(Point3d inPosition, Sphere inSphere, Material inMaterial)
 501         {
 502                 Group group = new Group();
 503                 // Create ball and add to group
 504                 Transform3D ballShift = new Transform3D();
 505                 ballShift.setTranslation(new Vector3d(inPosition));
 506                 TransformGroup ballShiftTrans = new TransformGroup(ballShift);
 507                 inMaterial.setLightingEnable(true);
 508                 Appearance ballApp = new Appearance();
 509                 ballApp.setMaterial(inMaterial);
 510                 inSphere.setAppearance(ballApp);
 511                 ballShiftTrans.addChild(inSphere);
 512                 group.addChild(ballShiftTrans);
 513                 // Also create rod for ball to sit on
 514                 Cylinder rod = new Cylinder(0.1f, (float) inPosition.y);
 515                 Material rodMat = new Material(new Color3f(0.2f, 0.2f, 0.2f),
 516                  new Color3f(0.0f, 0.0f, 0.0f), new Color3f(0.2f, 0.2f, 0.2f),
 517                  new Color3f(0.05f, 0.05f, 0.05f), 0.4f);
 518                 rodMat.setLightingEnable(true);
 519                 Appearance rodApp = new Appearance();
 520                 rodApp.setMaterial(rodMat);
 521                 rod.setAppearance(rodApp);
 522                 Transform3D rodShift = new Transform3D();
 523                 rodShift.setTranslation(new Vector3d(inPosition.x,
 524                  inPosition.y/2.0, inPosition.z));
 525                 TransformGroup rodShiftTrans = new TransformGroup(rodShift);
 526                 rodShiftTrans.addChild(rod);
 527                 group.addChild(rodShiftTrans);
 528                 // return the pair
 529                 return group;
 530         }
 531
 532
 533         /**
 534          * Calculate the angles and call them back to the app
 535          */
 536         private void callbackRender()
 537         {
 538                 Transform3D trans3d = new Transform3D();
 539                 _orbit.getViewingPlatform().getViewPlatformTransform().getTransform(trans3d);
 540                 Matrix3d matrix = new Matrix3d();
 541                 trans3d.get(matrix);
 542                 Point3d point = new Point3d(0.0, 0.0, 1.0);
 543                 matrix.transform(point);
 544                 // Set up initial rotations
 545                 Transform3D firstTran = new Transform3D();
 546                 firstTran.rotY(Math.toRadians(-INITIAL_Y_ROTATION));
 547                 Transform3D secondTran = new Transform3D();
 548                 secondTran.rotX(Math.toRadians(-INITIAL_X_ROTATION));
 549                 // Apply inverse rotations in reverse order to test point
 550                 Point3d result = new Point3d();
 551                 secondTran.transform(point, result);
 552                 firstTran.transform(result);
 553                 // Callback settings to App
 554                 _app.exportPov(result.x, result.y, result.z, _altitudeCap);
 555         }
 556
 557
 558         /**
 559          * Get a units label for the altitudes in the given Track
 560          * @param inTrack Track object
 561          * @return units label for altitude used in Track
 562          */
 563         private static String getAltitudeUnitsLabel(Track inTrack)
 564         {
 565                 int altitudeFormat = inTrack.getAltitudeRange().getFormat();
 566                 if (altitudeFormat == Altitude.FORMAT_METRES)
 567                         return I18nManager.getText("units.metres.short");
 568                 return I18nManager.getText("units.feet.short");
 569         }
 570
 571 }