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