tim/prune/gui/map/MapCanvas.java

   1 package tim.prune.gui.map;
   2
   3 import java.awt.BasicStroke;
   4 import java.awt.BorderLayout;
   5 import java.awt.Color;
   6 import java.awt.Dimension;
   7 import java.awt.FlowLayout;
   8 import java.awt.FontMetrics;
   9 import java.awt.Graphics;
  10 import java.awt.Graphics2D;
  11 import java.awt.Image;
  12 import java.awt.event.ActionEvent;
  13 import java.awt.event.ActionListener;
  14 import java.awt.event.ItemEvent;
  15 import java.awt.event.ItemListener;
  16 import java.awt.event.KeyEvent;
  17 import java.awt.event.KeyListener;
  18 import java.awt.event.MouseEvent;
  19 import java.awt.event.MouseListener;
  20 import java.awt.event.MouseMotionListener;
  21 import java.awt.event.MouseWheelEvent;
  22 import java.awt.event.MouseWheelListener;
  23 import java.awt.image.BufferedImage;
  24
  25 import javax.swing.BorderFactory;
  26 import javax.swing.BoxLayout;
  27 import javax.swing.JButton;
  28 import javax.swing.JCheckBox;
  29 import javax.swing.JMenuItem;
  30 import javax.swing.JPanel;
  31 import javax.swing.JPopupMenu;
  32 import javax.swing.JSlider;
  33 import javax.swing.event.ChangeEvent;
  34 import javax.swing.event.ChangeListener;
  35
  36 import tim.prune.App;
  37 import tim.prune.DataSubscriber;
  38 import tim.prune.FunctionLibrary;
  39 import tim.prune.I18nManager;
  40 import tim.prune.UpdateMessageBroker;
  41 import tim.prune.config.ColourScheme;
  42 import tim.prune.config.Config;
  43 import tim.prune.data.Checker;
  44 import tim.prune.data.Coordinate;
  45 import tim.prune.data.DataPoint;
  46 import tim.prune.data.DoubleRange;
  47 import tim.prune.data.Latitude;
  48 import tim.prune.data.Longitude;
  49 import tim.prune.data.Selection;
  50 import tim.prune.data.Track;
  51 import tim.prune.data.TrackInfo;
  52 import tim.prune.gui.IconManager;
  53
  54 /**
  55  * Class for the map canvas, to display a background map and draw on it
  56  */
  57 public class MapCanvas extends JPanel implements MouseListener, MouseMotionListener, DataSubscriber,
  58         KeyListener, MouseWheelListener
  59 {
  60         /** App object for callbacks */
  61         private App _app = null;
  62         /** Track object */
  63         private Track _track = null;
  64         /** TrackInfo object */
  65         private TrackInfo _trackInfo = null;
  66         /** Selection object */
  67         private Selection _selection = null;
  68         /** Previously selected point */
  69         private int _prevSelectedPoint = -1;
  70         /** Tile manager */
  71         private MapTileManager _tileManager = new MapTileManager(this);
  72         /** Image to display */
  73         private BufferedImage _mapImage = null;
  74         /** Slider for transparency */
  75         private JSlider _transparencySlider = null;
  76         /** Checkbox for scale bar */
  77         private JCheckBox _scaleCheckBox = null;
  78         /** Checkbox for maps */
  79         private JCheckBox _mapCheckBox = null;
  80         /** Checkbox for autopan */
  81         private JCheckBox _autopanCheckBox = null;
  82         /** Checkbox for connecting track points */
  83         private JCheckBox _connectCheckBox = null;
  84         /** Right-click popup menu */
  85         private JPopupMenu _popup = null;
  86         /** Top component panel */
  87         private JPanel _topPanel = null;
  88         /** Side component panel */
  89         private JPanel _sidePanel = null;
  90         /** Scale bar */
  91         private ScaleBar _scaleBar = null;
  92         /* Data */
  93         private DoubleRange _latRange = null, _lonRange = null;
  94         private DoubleRange _xRange = null, _yRange = null;
  95         private boolean _recalculate = false;
  96         /** Flag to check bounds on next paint */
  97         private boolean _checkBounds = false;
  98         /** Map position */
  99         private MapPosition _mapPosition = null;
 100         /** x coordinate of drag from point */
 101         private int _dragFromX = -1;
 102         /** y coordinate of drag from point */
 103         private int _dragFromY = -1;
 104         /** x coordinate of drag to point */
 105         private int _dragToX = -1;
 106         /** y coordinate of drag to point */
 107         private int _dragToY = -1;
 108         /** x coordinate of popup menu */
 109         private int _popupMenuX = -1;
 110         /** y coordinate of popup menu */
 111         private int _popupMenuY = -1;
 112         /** Flag to prevent showing too often the error message about loading maps */
 113         private boolean _shownOsmErrorAlready = false;
 114         /** Current drawing mode */
 115         private int _drawMode = MODE_DEFAULT;
 116
 117         /** Constant for click sensitivity when selecting nearest point */
 118         private static final int CLICK_SENSITIVITY = 10;
 119         /** Constant for pan distance from key presses */
 120         private static final int PAN_DISTANCE = 20;
 121         /** Constant for pan distance from autopan */
 122         private static final int AUTOPAN_DISTANCE = 75;
 123
 124         // Colours
 125         private static final Color COLOR_MESSAGES   = Color.GRAY;
 126
 127         // Drawing modes
 128         private static final int MODE_DEFAULT = 0;
 129         private static final int MODE_ZOOM_RECT = 1;
 130         private static final int MODE_DRAW_POINTS_START = 2;
 131         private static final int MODE_DRAW_POINTS_CONT = 3;
 132
 133         /**
 134          * Constructor
 135          * @param inApp App object for callbacks
 136          * @param inTrackInfo track info object
 137          */
 138         public MapCanvas(App inApp, TrackInfo inTrackInfo)
 139         {
 140                 _app = inApp;
 141                 _trackInfo = inTrackInfo;
 142                 _track = inTrackInfo.getTrack();
 143                 _selection = inTrackInfo.getSelection();
 144                 _mapPosition = new MapPosition();
 145                 addMouseListener(this);
 146                 addMouseMotionListener(this);
 147                 addMouseWheelListener(this);
 148                 addKeyListener(this);
 149
 150                 // Make listener for changes to controls
 151                 ItemListener itemListener = new ItemListener() {
 152                         public void itemStateChanged(ItemEvent e)
 153                         {
 154                                 _recalculate = true;
 155                                 repaint();
 156                         }
 157                 };
 158                 // Make special listener for changes to map checkbox
 159                 ItemListener mapCheckListener = new ItemListener() {
 160                         public void itemStateChanged(ItemEvent e)
 161                         {
 162                                 _tileManager.clearMemoryCaches();
 163                                 _recalculate = true;
 164                                 Config.setConfigBoolean(Config.KEY_SHOW_MAP, e.getStateChange() == ItemEvent.SELECTED);
 165                                 UpdateMessageBroker.informSubscribers(); // to let menu know
 166                         }
 167                 };
 168                 _topPanel = new JPanel();
 169                 _topPanel.setLayout(new FlowLayout());
 170                 _topPanel.setOpaque(false);
 171                 // Make slider for transparency
 172                 _transparencySlider = new JSlider(-6, 6, 0);
 173                 _transparencySlider.setPreferredSize(new Dimension(100, 20));
 174                 _transparencySlider.setMajorTickSpacing(1);
 175                 _transparencySlider.setSnapToTicks(true);
 176                 _transparencySlider.setOpaque(false);
 177                 _transparencySlider.setValue(0);
 178                 _transparencySlider.addChangeListener(new ChangeListener() {
 179                         public void stateChanged(ChangeEvent e)
 180                         {
 181                                 int val = _transparencySlider.getValue();
 182                                 if (val == 1 || val == -1)
 183                                         _transparencySlider.setValue(0);
 184                                 else {
 185                                         _recalculate = true;
 186                                         repaint();
 187                                 }
 188                         }
 189                 });
 190                 _transparencySlider.setFocusable(false); // stop slider from stealing keyboard focus
 191                 _topPanel.add(_transparencySlider);
 192                 // Add checkbox button for enabling scale bar
 193                 _scaleCheckBox = new JCheckBox(IconManager.getImageIcon(IconManager.SCALEBAR_BUTTON), true);
 194                 _scaleCheckBox.setSelectedIcon(IconManager.getImageIcon(IconManager.SCALEBAR_BUTTON_ON));
 195                 _scaleCheckBox.setOpaque(false);
 196                 _scaleCheckBox.setToolTipText(I18nManager.getText("menu.map.showscalebar"));
 197                 _scaleCheckBox.addItemListener(new ItemListener() {
 198                         public void itemStateChanged(ItemEvent e) {
 199                                 _scaleBar.setVisible(_scaleCheckBox.isSelected());
 200                         }
 201                 });
 202                 _scaleCheckBox.setFocusable(false); // stop button from stealing keyboard focus
 203                 _topPanel.add(_scaleCheckBox);
 204                 // Add checkbox button for enabling maps or not
 205                 _mapCheckBox = new JCheckBox(IconManager.getImageIcon(IconManager.MAP_BUTTON), false);
 206                 _mapCheckBox.setSelectedIcon(IconManager.getImageIcon(IconManager.MAP_BUTTON_ON));
 207                 _mapCheckBox.setOpaque(false);
 208                 _mapCheckBox.setToolTipText(I18nManager.getText("menu.map.showmap"));
 209                 _mapCheckBox.addItemListener(mapCheckListener);
 210                 _mapCheckBox.setFocusable(false); // stop button from stealing keyboard focus
 211                 _topPanel.add(_mapCheckBox);
 212                 // Add checkbox button for enabling autopan or not
 213                 _autopanCheckBox = new JCheckBox(IconManager.getImageIcon(IconManager.AUTOPAN_BUTTON), true);
 214                 _autopanCheckBox.setSelectedIcon(IconManager.getImageIcon(IconManager.AUTOPAN_BUTTON_ON));
 215                 _autopanCheckBox.setOpaque(false);
 216                 _autopanCheckBox.setToolTipText(I18nManager.getText("menu.map.autopan"));
 217                 _autopanCheckBox.addItemListener(itemListener);
 218                 _autopanCheckBox.setFocusable(false); // stop button from stealing keyboard focus
 219                 _topPanel.add(_autopanCheckBox);
 220                 // Add checkbox button for connecting points or not
 221                 _connectCheckBox = new JCheckBox(IconManager.getImageIcon(IconManager.POINTS_DISCONNECTED_BUTTON), true);
 222                 _connectCheckBox.setSelectedIcon(IconManager.getImageIcon(IconManager.POINTS_CONNECTED_BUTTON));
 223                 _connectCheckBox.setOpaque(false);
 224                 _connectCheckBox.setToolTipText(I18nManager.getText("menu.map.connect"));
 225                 _connectCheckBox.addItemListener(itemListener);
 226                 _connectCheckBox.setFocusable(false); // stop button from stealing keyboard focus
 227                 _topPanel.add(_connectCheckBox);
 228
 229                 // Add zoom in, zoom out buttons
 230                 _sidePanel = new JPanel();
 231                 _sidePanel.setLayout(new BoxLayout(_sidePanel, BoxLayout.Y_AXIS));
 232                 _sidePanel.setOpaque(false);
 233                 JButton zoomInButton = new JButton(IconManager.getImageIcon(IconManager.ZOOM_IN_BUTTON));
 234                 zoomInButton.setBorder(BorderFactory.createEmptyBorder(3, 3, 3, 3));
 235                 zoomInButton.setContentAreaFilled(false);
 236                 zoomInButton.setToolTipText(I18nManager.getText("menu.map.zoomin"));
 237                 zoomInButton.addActionListener(new ActionListener() {
 238                         public void actionPerformed(ActionEvent e)
 239                         {
 240                                 zoomIn();
 241                         }
 242                 });
 243                 zoomInButton.setFocusable(false); // stop button from stealing keyboard focus
 244                 _sidePanel.add(zoomInButton);
 245                 JButton zoomOutButton = new JButton(IconManager.getImageIcon(IconManager.ZOOM_OUT_BUTTON));
 246                 zoomOutButton.setBorder(BorderFactory.createEmptyBorder(3, 3, 3, 3));
 247                 zoomOutButton.setContentAreaFilled(false);
 248                 zoomOutButton.setToolTipText(I18nManager.getText("menu.map.zoomout"));
 249                 zoomOutButton.addActionListener(new ActionListener() {
 250                         public void actionPerformed(ActionEvent e)
 251                         {
 252                                 zoomOut();
 253                         }
 254                 });
 255                 zoomOutButton.setFocusable(false); // stop button from stealing keyboard focus
 256                 _sidePanel.add(zoomOutButton);
 257
 258                 // Bottom panel for scale bar
 259                 _scaleBar = new ScaleBar();
 260
 261                 // add control panels to this one
 262                 setLayout(new BorderLayout());
 263                 _topPanel.setVisible(false);
 264                 _sidePanel.setVisible(false);
 265                 add(_topPanel, BorderLayout.NORTH);
 266                 add(_sidePanel, BorderLayout.WEST);
 267                 add(_scaleBar, BorderLayout.SOUTH);
 268                 // Make popup menu
 269                 makePopup();
 270         }
 271
 272
 273         /**
 274          * Make the popup menu for right-clicking the map
 275          */
 276         private void makePopup()
 277         {
 278                 _popup = new JPopupMenu();
 279                 JMenuItem zoomInItem = new JMenuItem(I18nManager.getText("menu.map.zoomin"));
 280                 zoomInItem.addActionListener(new ActionListener() {
 281                         public void actionPerformed(ActionEvent e)
 282                         {
 283                                 panMap((_popupMenuX - getWidth()/2)/2, (_popupMenuY - getHeight()/2)/2);
 284                                 zoomIn();
 285                         }});
 286                 _popup.add(zoomInItem);
 287                 JMenuItem zoomOutItem = new JMenuItem(I18nManager.getText("menu.map.zoomout"));
 288                 zoomOutItem.addActionListener(new ActionListener() {
 289                         public void actionPerformed(ActionEvent e)
 290                         {
 291                                 panMap(-(_popupMenuX - getWidth()/2), -(_popupMenuY - getHeight()/2));
 292                                 zoomOut();
 293                         }});
 294                 _popup.add(zoomOutItem);
 295                 JMenuItem zoomFullItem = new JMenuItem(I18nManager.getText("menu.map.zoomfull"));
 296                 zoomFullItem.addActionListener(new ActionListener() {
 297                         public void actionPerformed(ActionEvent e)
 298                         {
 299                                 zoomToFit();
 300                                 _recalculate = true;
 301                                 repaint();
 302                         }});
 303                 _popup.add(zoomFullItem);
 304                 _popup.addSeparator();
 305                 // Set background
 306                 JMenuItem setMapBgItem = new JMenuItem(
 307                         I18nManager.getText(FunctionLibrary.FUNCTION_SET_MAP_BG.getNameKey()));
 308                 setMapBgItem.addActionListener(new ActionListener() {
 309                         public void actionPerformed(ActionEvent e)
 310                         {
 311                                 FunctionLibrary.FUNCTION_SET_MAP_BG.begin();
 312                         }});
 313                 _popup.add(setMapBgItem);
 314                 // new point option
 315                 JMenuItem newPointItem = new JMenuItem(I18nManager.getText("menu.map.newpoint"));
 316                 newPointItem.addActionListener(new ActionListener() {
 317                         public void actionPerformed(ActionEvent e)
 318                         {
 319                                 _app.createPoint(createPointFromClick(_popupMenuX, _popupMenuY));
 320                         }});
 321                 _popup.add(newPointItem);
 322                 // draw point series
 323                 JMenuItem drawPointsItem = new JMenuItem(I18nManager.getText("menu.map.drawpoints"));
 324                 drawPointsItem.addActionListener(new ActionListener() {
 325                         public void actionPerformed(ActionEvent e)
 326                         {
 327                                 _drawMode = MODE_DRAW_POINTS_START;
 328                         }
 329                 });
 330                 _popup.add(drawPointsItem);
 331         }
 332
 333
 334         /**
 335          * Zoom to fit the current data area
 336          */
 337         private void zoomToFit()
 338         {
 339                 _latRange = _track.getLatRange();
 340                 _lonRange = _track.getLonRange();
 341                 _xRange = new DoubleRange(MapUtils.getXFromLongitude(_lonRange.getMinimum()),
 342                         MapUtils.getXFromLongitude(_lonRange.getMaximum()));
 343                 _yRange = new DoubleRange(MapUtils.getYFromLatitude(_latRange.getMinimum()),
 344                         MapUtils.getYFromLatitude(_latRange.getMaximum()));
 345                 _mapPosition.zoomToXY(_xRange.getMinimum(), _xRange.getMaximum(), _yRange.getMinimum(), _yRange.getMaximum(),
 346                         getWidth(), getHeight());
 347         }
 348
 349
 350         /**
 351          * Paint method
 352          * @see java.awt.Canvas#paint(java.awt.Graphics)
 353          */
 354         public void paint(Graphics inG)
 355         {
 356                 super.paint(inG);
 357                 if (_mapImage != null && (_mapImage.getWidth() != getWidth() || _mapImage.getHeight() != getHeight())) {
 358                         _mapImage = null;
 359                 }
 360                 if (_track.getNumPoints() > 0)
 361                 {
 362                         // Check for autopan if enabled / necessary
 363                         if (_autopanCheckBox.isSelected())
 364                         {
 365                                 int selectedPoint = _selection.getCurrentPointIndex();
 366                                 if (selectedPoint >= 0 && _dragFromX == -1 && selectedPoint != _prevSelectedPoint)
 367                                 {
 368                                         int px = getWidth() / 2 + _mapPosition.getXFromCentre(_track.getX(selectedPoint));
 369                                         int py = getHeight() / 2 + _mapPosition.getYFromCentre(_track.getY(selectedPoint));
 370                                         int panX = 0;
 371                                         int panY = 0;
 372                                         if (px < PAN_DISTANCE) {
 373                                                 panX = px - AUTOPAN_DISTANCE;
 374                                         }
 375                                         else if (px > (getWidth()-PAN_DISTANCE)) {
 376                                                 panX = AUTOPAN_DISTANCE + px - getWidth();
 377                                         }
 378                                         if (py < PAN_DISTANCE) {
 379                                                 panY = py - AUTOPAN_DISTANCE;
 380                                         }
 381                                         if (py > (getHeight()-PAN_DISTANCE)) {
 382                                                 panY = AUTOPAN_DISTANCE + py - getHeight();
 383                                         }
 384                                         if (panX != 0 || panY != 0) {
 385                                                 _mapPosition.pan(panX, panY);
 386                                         }
 387                                 }
 388                                 _prevSelectedPoint = selectedPoint;
 389                         }
 390
 391                         // Draw the map contents if necessary
 392                         if ((_mapImage == null || _recalculate))
 393                         {
 394                                 paintMapContents();
 395                                 _scaleBar.updateScale(_mapPosition.getZoom(), _mapPosition.getYFromPixels(0, 0));
 396                         }
 397                         // Draw the prepared image onto the panel
 398                         if (_mapImage != null) {
 399                                 inG.drawImage(_mapImage, 0, 0, getWidth(), getHeight(), null);
 400                         }
 401                         // Draw the zoom rectangle if necessary
 402                         if (_drawMode == MODE_ZOOM_RECT)
 403                         {
 404                                 inG.setColor(Color.RED);
 405                                 inG.drawLine(_dragFromX, _dragFromY, _dragFromX, _dragToY);
 406                                 inG.drawLine(_dragFromX, _dragFromY, _dragToX, _dragFromY);
 407                                 inG.drawLine(_dragToX, _dragFromY, _dragToX, _dragToY);
 408                                 inG.drawLine(_dragFromX, _dragToY, _dragToX, _dragToY);
 409                         }
 410                         else if (_drawMode == MODE_DRAW_POINTS_CONT)
 411                         {
 412                                 // draw line to mouse position to show drawing mode
 413                                 inG.setColor(Config.getColourScheme().getColour(ColourScheme.IDX_POINT));
 414                                 int prevIndex = _track.getNumPoints()-1;
 415                                 int px = getWidth() / 2 + _mapPosition.getXFromCentre(_track.getX(prevIndex));
 416                                 int py = getHeight() / 2 + _mapPosition.getYFromCentre(_track.getY(prevIndex));
 417                                 inG.drawLine(px, py, _dragToX, _dragToY);
 418                         }
 419                 }
 420                 else
 421                 {
 422                         inG.setColor(Config.getColourScheme().getColour(ColourScheme.IDX_BACKGROUND));
 423                         inG.fillRect(0, 0, getWidth(), getHeight());
 424                         inG.setColor(COLOR_MESSAGES);
 425                         inG.drawString(I18nManager.getText("display.nodata"), 50, getHeight()/2);
 426                         _scaleBar.updateScale(-1, 0);
 427                 }
 428                 // Draw slider etc on top
 429                 paintChildren(inG);
 430         }
 431
 432
 433         /**
 434          * Paint the map tiles and the points on to the _mapImage
 435          */
 436         private void paintMapContents()
 437         {
 438                 if (_mapImage == null || _mapImage.getWidth() != getWidth() || _mapImage.getHeight() != getHeight())
 439                 {
 440                         _mapImage = new BufferedImage(getWidth(), getHeight(), BufferedImage.TYPE_INT_RGB);
 441                 }
 442
 443                 // Clear map
 444                 Graphics g = _mapImage.getGraphics();
 445                 // Clear to background
 446                 g.setColor(Config.getColourScheme().getColour(ColourScheme.IDX_BACKGROUND));
 447                 g.fillRect(0, 0, getWidth(), getHeight());
 448
 449                 // Check whether maps are on or not
 450                 boolean showMap = Config.getConfigBoolean(Config.KEY_SHOW_MAP);
 451                 _mapCheckBox.setSelected(showMap);
 452
 453                 // reset error message
 454                 if (!showMap) {_shownOsmErrorAlready = false;}
 455                 _recalculate = false;
 456                 // Only get map tiles if selected
 457                 if (showMap)
 458                 {
 459                         // init tile cacher
 460                         _tileManager.centreMap(_mapPosition.getZoom(), _mapPosition.getCentreTileX(), _mapPosition.getCentreTileY());
 461
 462                         boolean loadingFailed = false;
 463                         if (_mapImage == null) return;
 464
 465                         if (_tileManager.isOverzoomed())
 466                         {
 467                                 // display overzoom message
 468                                 g.setColor(COLOR_MESSAGES);
 469                                 g.drawString(I18nManager.getText("map.overzoom"), 50, getHeight()/2);
 470                         }
 471                         else
 472                         {
 473                                 int numLayers = _tileManager.getNumLayers();
 474                                 // Loop over tiles drawing each one
 475                                 int[] tileIndices = _mapPosition.getTileIndices(getWidth(), getHeight());
 476                                 int[] pixelOffsets = _mapPosition.getDisplayOffsets(getWidth(), getHeight());
 477                                 for (int tileX = tileIndices[0]; tileX <= tileIndices[1] && !loadingFailed; tileX++)
 478                                 {
 479                                         int x = (tileX - tileIndices[0]) * 256 - pixelOffsets[0];
 480                                         for (int tileY = tileIndices[2]; tileY <= tileIndices[3]; tileY++)
 481                                         {
 482                                                 int y = (tileY - tileIndices[2]) * 256 - pixelOffsets[1];
 483                                                 // Loop over layers
 484                                                 for (int l=0; l<numLayers; l++)
 485                                                 {
 486                                                         Image image = _tileManager.getTile(l, tileX, tileY);
 487                                                         if (image != null) {
 488                                                                 g.drawImage(image, x, y, 256, 256, null);
 489                                                         }
 490                                                 }
 491                                         }
 492                                 }
 493
 494                                 // Make maps brighter / fainter according to slider
 495                                 final int brightnessIndex = Math.max(1, _transparencySlider.getValue()) - 1;
 496                                 if (brightnessIndex > 0)
 497                                 {
 498                                         final int[] alphas = {0, 40, 80, 120, 160, 210};
 499                                         Color bgColor = Config.getColourScheme().getColour(ColourScheme.IDX_BACKGROUND);
 500                                         bgColor = new Color(bgColor.getRed(), bgColor.getGreen(), bgColor.getBlue(), alphas[brightnessIndex]);
 501                                         g.setColor(bgColor);
 502                                         g.fillRect(0, 0, getWidth(), getHeight());
 503                                 }
 504                         }
 505                 }
 506
 507                 // Paint the track points on top
 508                 int pointsPainted = 1;
 509                 try
 510                 {
 511                         pointsPainted = paintPoints(g);
 512                 }
 513                 catch (NullPointerException npe) { // ignore, probably due to data being changed during drawing
 514                 }
 515
 516                 // free g
 517                 g.dispose();
 518
 519                 // Zoom to fit if no points found
 520                 if (pointsPainted <= 0 && _checkBounds) {
 521                         zoomToFit();
 522                         _recalculate = true;
 523                         repaint();
 524                 }
 525                 _checkBounds = false;
 526                 // enable / disable transparency slider
 527                 _transparencySlider.setEnabled(showMap);
 528         }
 529
 530
 531         /**
 532          * Paint the points using the given graphics object
 533          * @param inG Graphics object to use for painting
 534          * @return number of points painted, if any
 535          */
 536         private int paintPoints(Graphics inG)
 537         {
 538                 // Set up colours
 539                 final ColourScheme cs = Config.getColourScheme();
 540                 final int[] opacities = {255, 190, 130, 80, 40, 0};
 541                 int opacity = 255;
 542                 if (_transparencySlider.getValue() < 0)
 543                         opacity = opacities[-1 - _transparencySlider.getValue()];
 544                 final Color pointColour  = makeTransparentColour(cs.getColour(ColourScheme.IDX_POINT), opacity);
 545                 final Color rangeColour  = makeTransparentColour(cs.getColour(ColourScheme.IDX_SELECTION), opacity);
 546                 final Color currentColour = makeTransparentColour(cs.getColour(ColourScheme.IDX_PRIMARY), opacity);
 547                 final Color secondColour = makeTransparentColour(cs.getColour(ColourScheme.IDX_SECONDARY), opacity);
 548                 final Color textColour   = makeTransparentColour(cs.getColour(ColourScheme.IDX_TEXT), opacity);
 549
 550                 // try to set line width for painting
 551                 if (inG instanceof Graphics2D)
 552                 {
 553                         int lineWidth = Config.getConfigInt(Config.KEY_LINE_WIDTH);
 554                         if (lineWidth < 1 || lineWidth > 4) {lineWidth = 2;}
 555                         ((Graphics2D) inG).setStroke(new BasicStroke(lineWidth));
 556                 }
 557                 int pointsPainted = 0;
 558                 // draw track points
 559                 inG.setColor(pointColour);
 560                 int prevX = -1, prevY = -1;
 561                 boolean connectPoints = _connectCheckBox.isSelected();
 562                 boolean prevPointVisible = false, currPointVisible = false;
 563                 boolean anyWaypoints = false;
 564                 boolean isWaypoint = false;
 565                 for (int i=0; i<_track.getNumPoints(); i++)
 566                 {
 567                         int px = getWidth() / 2 + _mapPosition.getXFromCentre(_track.getX(i));
 568                         int py = getHeight() / 2 + _mapPosition.getYFromCentre(_track.getY(i));
 569                         currPointVisible = px >= 0 && px < getWidth() && py >= 0 && py < getHeight();
 570                         isWaypoint = _track.getPoint(i).isWaypoint();
 571                         anyWaypoints = anyWaypoints || isWaypoint;
 572                         if (currPointVisible)
 573                         {
 574                                 if (!isWaypoint)
 575                                 {
 576                                         // Draw rectangle for track point
 577                                         if (_track.getPoint(i).getDeleteFlag()) {
 578                                                 inG.setColor(currentColour);
 579                                         }
 580                                         else {
 581                                                 inG.setColor(pointColour);
 582                                         }
 583                                         inG.drawRect(px-2, py-2, 3, 3);
 584                                         pointsPainted++;
 585                                 }
 586                         }
 587                         if (!isWaypoint)
 588                         {
 589                                 // Connect track points if either of them are visible
 590                                 if (connectPoints && (currPointVisible || prevPointVisible)
 591                                  && !(prevX == -1 && prevY == -1)
 592                                  && !_track.getPoint(i).getSegmentStart())
 593                                 {
 594                                         inG.drawLine(prevX, prevY, px, py);
 595                                 }
 596                                 prevX = px; prevY = py;
 597                         }
 598                         prevPointVisible = currPointVisible;
 599                 }
 600
 601                 // Loop over points, just drawing blobs for waypoints
 602                 inG.setColor(textColour);
 603                 FontMetrics fm = inG.getFontMetrics();
 604                 int nameHeight = fm.getHeight();
 605                 int width = getWidth();
 606                 int height = getHeight();
 607                 if (anyWaypoints) {
 608                         for (int i=0; i<_track.getNumPoints(); i++)
 609                         {
 610                                 if (_track.getPoint(i).isWaypoint())
 611                                 {
 612                                         int px = getWidth() / 2 + _mapPosition.getXFromCentre(_track.getX(i));
 613                                         int py = getHeight() / 2 + _mapPosition.getYFromCentre(_track.getY(i));
 614                                         if (px >= 0 && px < getWidth() && py >= 0 && py < getHeight())
 615                                         {
 616                                                 inG.fillRect(px-3, py-3, 6, 6);
 617                                                 pointsPainted++;
 618                                         }
 619                                 }
 620                         }
 621                         // Loop over points again, now draw names for waypoints
 622                         for (int i=0; i<_track.getNumPoints(); i++)
 623                         {
 624                                 if (_track.getPoint(i).isWaypoint())
 625                                 {
 626                                         int px = getWidth() / 2 + _mapPosition.getXFromCentre(_track.getX(i));
 627                                         int py = getHeight() / 2 + _mapPosition.getYFromCentre(_track.getY(i));
 628                                         if (px >= 0 && px < getWidth() && py >= 0 && py < getHeight())
 629                                         {
 630                                                 // Figure out where to draw waypoint name so it doesn't obscure track
 631                                                 String waypointName = _track.getPoint(i).getWaypointName();
 632                                                 int nameWidth = fm.stringWidth(waypointName);
 633                                                 boolean drawnName = false;
 634                                                 // Make arrays for coordinates right left up down
 635                                                 int[] nameXs = {px + 2, px - nameWidth - 2, px - nameWidth/2, px - nameWidth/2};
 636                                                 int[] nameYs = {py + (nameHeight/2), py + (nameHeight/2), py - 2, py + nameHeight + 2};
 637                                                 for (int extraSpace = 4; extraSpace < 13 && !drawnName; extraSpace+=2)
 638                                                 {
 639                                                         // Shift arrays for coordinates right left up down
 640                                                         nameXs[0] += 2; nameXs[1] -= 2;
 641                                                         nameYs[2] -= 2; nameYs[3] += 2;
 642                                                         // Check each direction in turn right left up down
 643                                                         for (int a=0; a<4; a++)
 644                                                         {
 645                                                                 if (nameXs[a] > 0 && (nameXs[a] + nameWidth) < width
 646                                                                         && nameYs[a] < height && (nameYs[a] - nameHeight) > 0
 647                                                                         && !overlapsPoints(nameXs[a], nameYs[a], nameWidth, nameHeight, textColour))
 648                                                                 {
 649                                                                         // Found a rectangle to fit - draw name here and quit
 650                                                                         inG.drawString(waypointName, nameXs[a], nameYs[a]);
 651                                                                         drawnName = true;
 652                                                                         break;
 653                                                                 }
 654                                                         }
 655                                                 }
 656                                         }
 657                                 }
 658                         }
 659                 }
 660                 // Loop over points, drawing blobs for photo / audio points
 661                 inG.setColor(secondColour);
 662                 for (int i=0; i<_track.getNumPoints(); i++)
 663                 {
 664                         if (_track.getPoint(i).hasMedia())
 665                         {
 666                                 int px = getWidth() / 2 + _mapPosition.getXFromCentre(_track.getX(i));
 667                                 int py = getHeight() / 2 + _mapPosition.getYFromCentre(_track.getY(i));
 668                                 if (px >= 0 && px < getWidth() && py >= 0 && py < getHeight())
 669                                 {
 670                                         inG.drawRect(px-1, py-1, 2, 2);
 671                                         inG.drawRect(px-2, py-2, 4, 4);
 672                                         pointsPainted++;
 673                                 }
 674                         }
 675                 }
 676
 677                 // Draw selected range
 678                 if (_selection.hasRangeSelected())
 679                 {
 680                         inG.setColor(rangeColour);
 681                         for (int i=_selection.getStart(); i<=_selection.getEnd(); i++)
 682                         {
 683                                 int px = getWidth() / 2 + _mapPosition.getXFromCentre(_track.getX(i));
 684                                 int py = getHeight() / 2 + _mapPosition.getYFromCentre(_track.getY(i));
 685                                 inG.drawRect(px-1, py-1, 2, 2);
 686                         }
 687                 }
 688
 689                 // Draw selected point, crosshairs
 690                 int selectedPoint = _selection.getCurrentPointIndex();
 691                 if (selectedPoint >= 0)
 692                 {
 693                         int px = getWidth() / 2 + _mapPosition.getXFromCentre(_track.getX(selectedPoint));
 694                         int py = getHeight() / 2 + _mapPosition.getYFromCentre(_track.getY(selectedPoint));
 695                         inG.setColor(currentColour);
 696                         // crosshairs
 697                         inG.drawLine(px, 0, px, getHeight());
 698                         inG.drawLine(0, py, getWidth(), py);
 699                         // oval
 700                         inG.drawOval(px - 2, py - 2, 4, 4);
 701                         inG.drawOval(px - 3, py - 3, 6, 6);
 702                 }
 703                 // Return the number of points painted
 704                 return pointsPainted;
 705         }
 706
 707
 708         /**
 709          * Tests whether there are any dark pixels within the specified x,y rectangle
 710          * @param inX left X coordinate
 711          * @param inY bottom Y coordinate
 712          * @param inWidth width of rectangle
 713          * @param inHeight height of rectangle
 714          * @param inTextColour colour of text
 715          * @return true if the rectangle overlaps stuff too close to the given colour
 716          */
 717         private boolean overlapsPoints(int inX, int inY, int inWidth, int inHeight, Color inTextColour)
 718         {
 719                 // each of the colour channels must be further away than this to count as empty
 720                 final int BRIGHTNESS_LIMIT = 80;
 721                 final int textRGB = inTextColour.getRGB();
 722                 final int textLow = textRGB & 255;
 723                 final int textMid = (textRGB >> 8) & 255;
 724                 final int textHigh = (textRGB >> 16) & 255;
 725                 try
 726                 {
 727                         // loop over x coordinate of rectangle
 728                         for (int x=0; x<inWidth; x++)
 729                         {
 730                                 // loop over y coordinate of rectangle
 731                                 for (int y=0; y<inHeight; y++)
 732                                 {
 733                                         int pixelColor = _mapImage.getRGB(inX + x, inY - y);
 734                                         // split into four components rgba
 735                                         int pixLow = pixelColor & 255;
 736                                         int pixMid = (pixelColor >> 8) & 255;
 737                                         int pixHigh = (pixelColor >> 16) & 255;
 738                                         //int fourthBit = (pixelColor >> 24) & 255; // alpha ignored
 739                                         // If colours are too close in any channel then it's an overlap
 740                                         if (Math.abs(pixLow-textLow) < BRIGHTNESS_LIMIT ||
 741                                                 Math.abs(pixMid-textMid) < BRIGHTNESS_LIMIT ||
 742                                                 Math.abs(pixHigh-textHigh) < BRIGHTNESS_LIMIT) {return true;}
 743                                 }
 744                         }
 745                 }
 746                 catch (NullPointerException e) {
 747                         // ignore null pointers, just return false
 748                 }
 749                 return false;
 750         }
 751
 752         /**
 753          * Make a semi-transparent colour for drawing with
 754          * @param inColour base colour (fully opaque)
 755          * @param inOpacity opacity where 0=invisible and 255=full
 756          * @return new colour object
 757          */
 758         private static Color makeTransparentColour(Color inColour, int inOpacity)
 759         {
 760                 if (inOpacity > 240) return inColour;
 761                 return new Color(inColour.getRed(), inColour.getGreen(), inColour.getBlue(), inOpacity);
 762         }
 763
 764         /**
 765          * Inform that tiles have been updated and the map can be repainted
 766          * @param inIsOk true if data loaded ok, false for error
 767          */
 768         public synchronized void tilesUpdated(boolean inIsOk)
 769         {
 770                 // Show message if loading failed (but not too many times)
 771                 if (!inIsOk && !_shownOsmErrorAlready && _mapCheckBox.isSelected())
 772                 {
 773                         _shownOsmErrorAlready = true;
 774                         // use separate thread to show message about failing to load osm images
 775                         new Thread(new Runnable() {
 776                                 public void run() {
 777                                         try {Thread.sleep(500);} catch (InterruptedException ie) {}
 778                                         _app.showErrorMessage("error.osmimage.dialogtitle", "error.osmimage.failed");
 779                                 }
 780                         }).start();
 781                 }
 782                 _recalculate = true;
 783                 repaint();
 784         }
 785
 786         /**
 787          * Zoom out, if not already at minimum zoom
 788          */
 789         public void zoomOut()
 790         {
 791                 _mapPosition.zoomOut();
 792                 _recalculate = true;
 793                 repaint();
 794         }
 795
 796         /**
 797          * Zoom in, if not already at maximum zoom
 798          */
 799         public void zoomIn()
 800         {
 801                 _mapPosition.zoomIn();
 802                 _recalculate = true;
 803                 repaint();
 804         }
 805
 806         /**
 807          * Pan map
 808          * @param inDeltaX x shift
 809          * @param inDeltaY y shift
 810          */
 811         public void panMap(int inDeltaX, int inDeltaY)
 812         {
 813                 _mapPosition.pan(inDeltaX, inDeltaY);
 814                 _recalculate = true;
 815                 repaint();
 816         }
 817
 818         /**
 819          * Create a DataPoint object from the given click coordinates
 820          * @param inX x coordinate of click
 821          * @param inY y coordinate of click
 822          * @return DataPoint with given coordinates and no altitude
 823          */
 824         private DataPoint createPointFromClick(int inX, int inY)
 825         {
 826                 double lat = MapUtils.getLatitudeFromY(_mapPosition.getYFromPixels(inY, getHeight()));
 827                 double lon = MapUtils.getLongitudeFromX(_mapPosition.getXFromPixels(inX, getWidth()));
 828                 return new DataPoint(new Latitude(lat, Coordinate.FORMAT_NONE),
 829                         new Longitude(lon, Coordinate.FORMAT_NONE), null);
 830         }
 831
 832         /**
 833          * @see javax.swing.JComponent#getMinimumSize()
 834          */
 835         public Dimension getMinimumSize()
 836         {
 837                 final Dimension minSize = new Dimension(512, 300);
 838                 return minSize;
 839         }
 840
 841         /**
 842          * @see javax.swing.JComponent#getPreferredSize()
 843          */
 844         public Dimension getPreferredSize()
 845         {
 846                 return getMinimumSize();
 847         }
 848
 849
 850         /**
 851          * Respond to mouse click events
 852          * @see java.awt.event.MouseListener#mouseClicked(java.awt.event.MouseEvent)
 853          */
 854         public void mouseClicked(MouseEvent inE)
 855         {
 856                 if (_track != null && _track.getNumPoints() > 0)
 857                 {
 858                          // select point if it's a left-click
 859                         if (!inE.isMetaDown())
 860                         {
 861                                 if (inE.getClickCount() == 1)
 862                                 {
 863                                         // single click
 864                                         if (_drawMode == MODE_DEFAULT)
 865                                         {
 866                                                 int pointIndex = _track.getNearestPointIndex(
 867                                                          _mapPosition.getXFromPixels(inE.getX(), getWidth()),
 868                                                          _mapPosition.getYFromPixels(inE.getY(), getHeight()),
 869                                                          _mapPosition.getBoundsFromPixels(CLICK_SENSITIVITY), false);
 870                                                 // Extend selection for shift-click
 871                                                 if (inE.isShiftDown()) {
 872                                                         _trackInfo.extendSelection(pointIndex);
 873                                                 }
 874                                                 else {
 875                                                         _trackInfo.selectPoint(pointIndex);
 876                                                 }
 877                                         }
 878                                         else if (_drawMode == MODE_DRAW_POINTS_START)
 879                                         {
 880                                                 _app.createPoint(createPointFromClick(inE.getX(), inE.getY()));
 881                                                 _dragToX = inE.getX();
 882                                                 _dragToY = inE.getY();
 883                                                 _drawMode = MODE_DRAW_POINTS_CONT;
 884                                         }
 885                                         else if (_drawMode == MODE_DRAW_POINTS_CONT)
 886                                         {
 887                                                 DataPoint point = createPointFromClick(inE.getX(), inE.getY());
 888                                                 _app.createPoint(point);
 889                                                 point.setSegmentStart(false);
 890                                         }
 891                                 }
 892                                 else if (inE.getClickCount() == 2)
 893                                 {
 894                                         // double click
 895                                         if (_drawMode == MODE_DEFAULT) {
 896                                                 panMap(inE.getX() - getWidth()/2, inE.getY() - getHeight()/2);
 897                                                 zoomIn();
 898                                         }
 899                                         else if (_drawMode == MODE_DRAW_POINTS_START || _drawMode == MODE_DRAW_POINTS_CONT) {
 900                                                 _drawMode = MODE_DEFAULT;
 901                                         }
 902                                 }
 903                         }
 904                         else
 905                         {
 906                                 // show the popup menu for right-clicks
 907                                 _popupMenuX = inE.getX();
 908                                 _popupMenuY = inE.getY();
 909                                 _popup.show(this, _popupMenuX, _popupMenuY);
 910                         }
 911                 }
 912         }
 913
 914         /**
 915          * Ignore mouse enter events
 916          * @see java.awt.event.MouseListener#mouseEntered(java.awt.event.MouseEvent)
 917          */
 918         public void mouseEntered(MouseEvent inE)
 919         {
 920                 // ignore
 921         }
 922
 923         /**
 924          * Ignore mouse exited events
 925          * @see java.awt.event.MouseListener#mouseExited(java.awt.event.MouseEvent)
 926          */
 927         public void mouseExited(MouseEvent inE)
 928         {
 929                 // ignore
 930         }
 931
 932         /**
 933          * Ignore mouse pressed events
 934          * @see java.awt.event.MouseListener#mousePressed(java.awt.event.MouseEvent)
 935          */
 936         public void mousePressed(MouseEvent inE)
 937         {
 938                 // ignore
 939         }
 940
 941         /**
 942          * Respond to mouse released events
 943          * @see java.awt.event.MouseListener#mouseReleased(java.awt.event.MouseEvent)
 944          */
 945         public void mouseReleased(MouseEvent inE)
 946         {
 947                 _recalculate = true;
 948                 if (_drawMode == MODE_ZOOM_RECT && Math.abs(_dragToX - _dragFromX) > 20
 949                         && Math.abs(_dragToY - _dragFromY) > 20)
 950                 {
 951                         _mapPosition.zoomToPixels(_dragFromX, _dragToX, _dragFromY, _dragToY, getWidth(), getHeight());
 952                 }
 953                 if (_drawMode == MODE_ZOOM_RECT) {
 954                         _drawMode = MODE_DEFAULT;
 955                 }
 956                 _dragFromX = _dragFromY = -1;
 957                 repaint();
 958         }
 959
 960         /**
 961          * Respond to mouse drag events
 962          * @see java.awt.event.MouseMotionListener#mouseDragged(java.awt.event.MouseEvent)
 963          */
 964         public void mouseDragged(MouseEvent inE)
 965         {
 966                 if (!inE.isMetaDown())
 967                 {
 968                         // Left mouse drag - pan map by appropriate amount
 969                         if (_dragFromX != -1)
 970                         {
 971                                 panMap(_dragFromX - inE.getX(), _dragFromY - inE.getY());
 972                                 _recalculate = true;
 973                                 repaint();
 974                         }
 975                         _dragFromX = _dragToX = inE.getX();
 976                         _dragFromY = _dragToY = inE.getY();
 977                 }
 978                 else
 979                 {
 980                         // Right-click and drag - draw rectangle and control zoom
 981                         _drawMode = MODE_ZOOM_RECT;
 982                         if (_dragFromX == -1) {
 983                                 _dragFromX = inE.getX();
 984                                 _dragFromY = inE.getY();
 985                         }
 986                         _dragToX = inE.getX();
 987                         _dragToY = inE.getY();
 988                         repaint();
 989                 }
 990         }
 991
 992         /**
 993          * Respond to mouse move events without button pressed
 994          * @param inEvent ignored
 995          */
 996         public void mouseMoved(MouseEvent inEvent)
 997         {
 998                 // Ignore unless we're drawing points
 999                 if (_drawMode == MODE_DRAW_POINTS_CONT)
1000                 {
1001                         _dragToX = inEvent.getX();
1002                         _dragToY = inEvent.getY();
1003                         repaint();
1004                 }
1005         }
1006
1007         /**
1008          * Respond to status bar message from broker
1009          * @param inMessage message, ignored
1010          */
1011         public void actionCompleted(String inMessage)
1012         {
1013                 // ignore
1014         }
1015
1016         /**
1017          * Respond to data updated message from broker
1018          * @param inUpdateType type of update
1019          */
1020         public void dataUpdated(byte inUpdateType)
1021         {
1022                 _recalculate = true;
1023                 if ((inUpdateType & DataSubscriber.DATA_ADDED_OR_REMOVED) > 0) {
1024                         _checkBounds = true;
1025                 }
1026                 if ((inUpdateType & DataSubscriber.MAPSERVER_CHANGED) > 0) {
1027                         _tileManager.resetConfig();
1028                 }
1029                 repaint();
1030                 // enable or disable components
1031                 boolean hasData = _track.getNumPoints() > 0;
1032                 _topPanel.setVisible(hasData);
1033                 _sidePanel.setVisible(hasData);
1034                 // grab focus for the key presses
1035                 this.requestFocus();
1036         }
1037
1038         /**
1039          * Respond to key presses on the map canvas
1040          * @param inE key event
1041          */
1042         public void keyPressed(KeyEvent inE)
1043         {
1044                 int code = inE.getKeyCode();
1045                 int currPointIndex = _selection.getCurrentPointIndex();
1046                 // Check for Ctrl key (for Linux/Win) or meta key (Clover key for Mac)
1047                 if (inE.isControlDown() || inE.isMetaDown())
1048                 {
1049                         // Shift as well makes things faster
1050                         final int pointIncrement = inE.isShiftDown()?3:1;
1051                         // Check for arrow keys to zoom in and out
1052                         if (code == KeyEvent.VK_UP)
1053                                 zoomIn();
1054                         else if (code == KeyEvent.VK_DOWN)
1055                                 zoomOut();
1056                         // Key nav for next/prev point
1057                         else if (code == KeyEvent.VK_LEFT && currPointIndex > 0)
1058                                 _trackInfo.incrementPointIndex(-pointIncrement);
1059                         else if (code == KeyEvent.VK_RIGHT)
1060                                 _trackInfo.incrementPointIndex(pointIncrement);
1061                         else if (code == KeyEvent.VK_PAGE_UP)
1062                                 _trackInfo.selectPoint(Checker.getPreviousSegmentStart(
1063                                         _trackInfo.getTrack(), _trackInfo.getSelection().getCurrentPointIndex()));
1064                         else if (code == KeyEvent.VK_PAGE_DOWN)
1065                                 _trackInfo.selectPoint(Checker.getNextSegmentStart(
1066                                         _trackInfo.getTrack(), _trackInfo.getSelection().getCurrentPointIndex()));
1067                         // Check for home and end
1068                         else if (code == KeyEvent.VK_HOME)
1069                                 _trackInfo.selectPoint(0);
1070                         else if (code == KeyEvent.VK_END)
1071                                 _trackInfo.selectPoint(_trackInfo.getTrack().getNumPoints()-1);
1072                 }
1073                 else
1074                 {
1075                         // Check for arrow keys to pan
1076                         int upwardsPan = 0;
1077                         if (code == KeyEvent.VK_UP)
1078                                 upwardsPan = -PAN_DISTANCE;
1079                         else if (code == KeyEvent.VK_DOWN)
1080                                 upwardsPan = PAN_DISTANCE;
1081                         int rightwardsPan = 0;
1082                         if (code == KeyEvent.VK_RIGHT)
1083                                 rightwardsPan = PAN_DISTANCE;
1084                         else if (code == KeyEvent.VK_LEFT)
1085                                 rightwardsPan = -PAN_DISTANCE;
1086                         panMap(rightwardsPan, upwardsPan);
1087                         // Check for escape
1088                         if (code == KeyEvent.VK_ESCAPE)
1089                                 _drawMode = MODE_DEFAULT;
1090                         // Check for backspace key to delete current point (delete key already handled by menu)
1091                         else if (code == KeyEvent.VK_BACK_SPACE && currPointIndex >= 0) {
1092                                 _app.deleteCurrentPoint();
1093                         }
1094                 }
1095         }
1096
1097         /**
1098          * @param inE key released event, ignored
1099          */
1100         public void keyReleased(KeyEvent e)
1101         {
1102                 // ignore
1103         }
1104
1105         /**
1106          * @param inE key typed event, ignored
1107          */
1108         public void keyTyped(KeyEvent inE)
1109         {
1110                 // ignore
1111         }
1112
1113         /**
1114          * @param inE mouse wheel event indicating scroll direction
1115          */
1116         public void mouseWheelMoved(MouseWheelEvent inE)
1117         {
1118                 int clicks = inE.getWheelRotation();
1119                 if (clicks < 0) {
1120                         panMap((inE.getX() - getWidth()/2)/2, (inE.getY() - getHeight()/2)/2);
1121                         zoomIn();
1122                 }
1123                 else if (clicks > 0) {
1124                         panMap(-(inE.getX() - getWidth()/2), -(inE.getY() - getHeight()/2));
1125                         zoomOut();
1126                 }
1127         }
1128
1129         /**
1130          * @return current map position
1131          */
1132         public MapPosition getMapPosition()
1133         {
1134                 return _mapPosition;
1135         }
1136 }