tim/prune/gui/map/MapCanvas.java

   1 package tim.prune.gui.map;
   2
   3 import java.awt.BorderLayout;
   4 import java.awt.Color;
   5 import java.awt.Dimension;
   6 import java.awt.FlowLayout;
   7 import java.awt.FontMetrics;
   8 import java.awt.Graphics;
   9 import java.awt.Image;
  10 import java.awt.RenderingHints;
  11 import java.awt.event.ActionEvent;
  12 import java.awt.event.ActionListener;
  13 import java.awt.event.ItemEvent;
  14 import java.awt.event.ItemListener;
  15 import java.awt.event.KeyEvent;
  16 import java.awt.event.KeyListener;
  17 import java.awt.event.MouseEvent;
  18 import java.awt.event.MouseListener;
  19 import java.awt.event.MouseMotionListener;
  20 import java.awt.event.MouseWheelEvent;
  21 import java.awt.event.MouseWheelListener;
  22 import java.awt.image.BufferedImage;
  23 import java.awt.image.RescaleOp;
  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.Coordinate;
  44 import tim.prune.data.DataPoint;
  45 import tim.prune.data.DoubleRange;
  46 import tim.prune.data.Latitude;
  47 import tim.prune.data.Longitude;
  48 import tim.prune.data.Selection;
  49 import tim.prune.data.Track;
  50 import tim.prune.data.TrackInfo;
  51 import tim.prune.gui.IconManager;
  52
  53 /**
  54  * Class for the map canvas, to display a background map and draw on it
  55  */
  56 public class MapCanvas extends JPanel implements MouseListener, MouseMotionListener, DataSubscriber,
  57         KeyListener, MouseWheelListener
  58 {
  59         /** App object for callbacks */
  60         private App _app = null;
  61         /** Track object */
  62         private Track _track = null;
  63         /** TrackInfo object */
  64         private TrackInfo _trackInfo = null;
  65         /** Selection object */
  66         private Selection _selection = null;
  67         /** Previously selected point */
  68         private int _prevSelectedPoint = -1;
  69         /** Tile cacher */
  70         private MapTileCacher _tileCacher = new MapTileCacher(this);
  71         /** Image to display */
  72         private BufferedImage _mapImage = null;
  73         /** Slider for transparency */
  74         private JSlider _transparencySlider = null;
  75         /** Checkbox for scale bar */
  76         private JCheckBox _scaleCheckBox = null;
  77         /** Checkbox for maps */
  78         private JCheckBox _mapCheckBox = null;
  79         /** Checkbox for autopan */
  80         private JCheckBox _autopanCheckBox = null;
  81         /** Checkbox for connecting track points */
  82         private JCheckBox _connectCheckBox = null;
  83         /** Right-click popup menu */
  84         private JPopupMenu _popup = null;
  85         /** Top component panel */
  86         private JPanel _topPanel = null;
  87         /** Side component panel */
  88         private JPanel _sidePanel = null;
  89         /** Scale bar */
  90         private ScaleBar _scaleBar = null;
  91         /* Data */
  92         private DoubleRange _latRange = null, _lonRange = null;
  93         private DoubleRange _xRange = null, _yRange = null;
  94         private boolean _recalculate = false;
  95         /** Flag to check bounds on next paint */
  96         private boolean _checkBounds = false;
  97         /** Map position */
  98         private MapPosition _mapPosition = null;
  99         /** x coordinate of drag from point */
 100         private int _dragFromX = -1;
 101         /** y coordinate of drag from point */
 102         private int _dragFromY = -1;
 103         /** Flag set to true for right-click dragging */
 104         private boolean _zoomDragging = false;
 105         /** x coordinate of drag to point */
 106         private int _dragToX = -1;
 107         /** y coordinate of drag to point */
 108         private int _dragToY = -1;
 109         /** x coordinate of popup menu */
 110         private int _popupMenuX = -1;
 111         /** y coordinate of popup menu */
 112         private int _popupMenuY = -1;
 113         /** Flag to prevent showing too often the error message about loading maps */
 114         private boolean _shownOsmErrorAlready = false;
 115
 116         /** Constant for click sensitivity when selecting nearest point */
 117         private static final int CLICK_SENSITIVITY = 10;
 118         /** Constant for pan distance from key presses */
 119         private static final int PAN_DISTANCE = 20;
 120         /** Constant for pan distance from autopan */
 121         private static final int AUTOPAN_DISTANCE = 75;
 122
 123         // Colours
 124         private static final Color COLOR_MESSAGES   = Color.GRAY;
 125
 126
 127         /**
 128          * Constructor
 129          * @param inApp App object for callbacks
 130          * @param inTrackInfo track info object
 131          */
 132         public MapCanvas(App inApp, TrackInfo inTrackInfo)
 133         {
 134                 _app = inApp;
 135                 _trackInfo = inTrackInfo;
 136                 _track = inTrackInfo.getTrack();
 137                 _selection = inTrackInfo.getSelection();
 138                 _mapPosition = new MapPosition();
 139                 addMouseListener(this);
 140                 addMouseMotionListener(this);
 141                 addMouseWheelListener(this);
 142                 addKeyListener(this);
 143
 144                 // Make listener for changes to controls
 145                 ItemListener itemListener = new ItemListener() {
 146                         public void itemStateChanged(ItemEvent e)
 147                         {
 148                                 _recalculate = true;
 149                                 repaint();
 150                         }
 151                 };
 152                 // Make special listener for changes to map checkbox
 153                 ItemListener mapCheckListener = new ItemListener() {
 154                         public void itemStateChanged(ItemEvent e)
 155                         {
 156                                 _tileCacher.clearAll();
 157                                 _recalculate = true;
 158                                 Config.setConfigBoolean(Config.KEY_SHOW_MAP, e.getStateChange() == ItemEvent.SELECTED);
 159                                 UpdateMessageBroker.informSubscribers(); // to let menu know
 160                         }
 161                 };
 162                 _topPanel = new JPanel();
 163                 _topPanel.setLayout(new FlowLayout());
 164                 _topPanel.setOpaque(false);
 165                 // Make slider for transparency
 166                 _transparencySlider = new JSlider(0, 5, 0);
 167                 _transparencySlider.setPreferredSize(new Dimension(100, 20));
 168                 _transparencySlider.setMajorTickSpacing(1);
 169                 _transparencySlider.setSnapToTicks(true);
 170                 _transparencySlider.setOpaque(false);
 171                 _transparencySlider.addChangeListener(new ChangeListener() {
 172                         public void stateChanged(ChangeEvent e)
 173                         {
 174                                 _recalculate = true;
 175                                 repaint();
 176                         }
 177                 });
 178                 _transparencySlider.setFocusable(false); // stop slider from stealing keyboard focus
 179                 _topPanel.add(_transparencySlider);
 180                 // Add checkbox button for enabling scale bar
 181                 _scaleCheckBox = new JCheckBox(IconManager.getImageIcon(IconManager.SCALEBAR_BUTTON), true);
 182                 _scaleCheckBox.setSelectedIcon(IconManager.getImageIcon(IconManager.SCALEBAR_BUTTON_ON));
 183                 _scaleCheckBox.setOpaque(false);
 184                 _scaleCheckBox.setToolTipText(I18nManager.getText("menu.map.showscalebar"));
 185                 _scaleCheckBox.addItemListener(new ItemListener() {
 186                         public void itemStateChanged(ItemEvent e) {
 187                                 _scaleBar.setVisible(_scaleCheckBox.isSelected());
 188                         }
 189                 });
 190                 _scaleCheckBox.setFocusable(false); // stop button from stealing keyboard focus
 191                 _topPanel.add(_scaleCheckBox);
 192                 // Add checkbox button for enabling maps or not
 193                 _mapCheckBox = new JCheckBox(IconManager.getImageIcon(IconManager.MAP_BUTTON), false);
 194                 _mapCheckBox.setSelectedIcon(IconManager.getImageIcon(IconManager.MAP_BUTTON_ON));
 195                 _mapCheckBox.setOpaque(false);
 196                 _mapCheckBox.setToolTipText(I18nManager.getText("menu.map.showmap"));
 197                 _mapCheckBox.addItemListener(mapCheckListener);
 198                 _mapCheckBox.setFocusable(false); // stop button from stealing keyboard focus
 199                 _topPanel.add(_mapCheckBox);
 200                 // Add checkbox button for enabling autopan or not
 201                 _autopanCheckBox = new JCheckBox(IconManager.getImageIcon(IconManager.AUTOPAN_BUTTON), true);
 202                 _autopanCheckBox.setSelectedIcon(IconManager.getImageIcon(IconManager.AUTOPAN_BUTTON_ON));
 203                 _autopanCheckBox.setOpaque(false);
 204                 _autopanCheckBox.setToolTipText(I18nManager.getText("menu.map.autopan"));
 205                 _autopanCheckBox.addItemListener(itemListener);
 206                 _autopanCheckBox.setFocusable(false); // stop button from stealing keyboard focus
 207                 _topPanel.add(_autopanCheckBox);
 208                 // Add checkbox button for connecting points or not
 209                 _connectCheckBox = new JCheckBox(IconManager.getImageIcon(IconManager.POINTS_DISCONNECTED_BUTTON), true);
 210                 _connectCheckBox.setSelectedIcon(IconManager.getImageIcon(IconManager.POINTS_CONNECTED_BUTTON));
 211                 _connectCheckBox.setOpaque(false);
 212                 _connectCheckBox.setToolTipText(I18nManager.getText("menu.map.connect"));
 213                 _connectCheckBox.addItemListener(itemListener);
 214                 _connectCheckBox.setFocusable(false); // stop button from stealing keyboard focus
 215                 _topPanel.add(_connectCheckBox);
 216
 217                 // Add zoom in, zoom out buttons
 218                 _sidePanel = new JPanel();
 219                 _sidePanel.setLayout(new BoxLayout(_sidePanel, BoxLayout.Y_AXIS));
 220                 _sidePanel.setOpaque(false);
 221                 JButton zoomInButton = new JButton(IconManager.getImageIcon(IconManager.ZOOM_IN_BUTTON));
 222                 zoomInButton.setBorder(BorderFactory.createEmptyBorder(3, 3, 3, 3));
 223                 zoomInButton.setContentAreaFilled(false);
 224                 zoomInButton.setToolTipText(I18nManager.getText("menu.map.zoomin"));
 225                 zoomInButton.addActionListener(new ActionListener() {
 226                         public void actionPerformed(ActionEvent e)
 227                         {
 228                                 zoomIn();
 229                         }
 230                 });
 231                 zoomInButton.setFocusable(false); // stop button from stealing keyboard focus
 232                 _sidePanel.add(zoomInButton);
 233                 JButton zoomOutButton = new JButton(IconManager.getImageIcon(IconManager.ZOOM_OUT_BUTTON));
 234                 zoomOutButton.setBorder(BorderFactory.createEmptyBorder(3, 3, 3, 3));
 235                 zoomOutButton.setContentAreaFilled(false);
 236                 zoomOutButton.setToolTipText(I18nManager.getText("menu.map.zoomout"));
 237                 zoomOutButton.addActionListener(new ActionListener() {
 238                         public void actionPerformed(ActionEvent e)
 239                         {
 240                                 zoomOut();
 241                         }
 242                 });
 243                 zoomOutButton.setFocusable(false); // stop button from stealing keyboard focus
 244                 _sidePanel.add(zoomOutButton);
 245
 246                 // Bottom panel for scale bar
 247                 _scaleBar = new ScaleBar();
 248
 249                 // add control panels to this one
 250                 setLayout(new BorderLayout());
 251                 _topPanel.setVisible(false);
 252                 _sidePanel.setVisible(false);
 253                 add(_topPanel, BorderLayout.NORTH);
 254                 add(_sidePanel, BorderLayout.WEST);
 255                 add(_scaleBar, BorderLayout.SOUTH);
 256                 // Make popup menu
 257                 makePopup();
 258         }
 259
 260
 261         /**
 262          * Make the popup menu for right-clicking the map
 263          */
 264         private void makePopup()
 265         {
 266                 _popup = new JPopupMenu();
 267                 JMenuItem zoomInItem = new JMenuItem(I18nManager.getText("menu.map.zoomin"));
 268                 zoomInItem.addActionListener(new ActionListener() {
 269                         public void actionPerformed(ActionEvent e)
 270                         {
 271                                 zoomIn();
 272                         }});
 273                 zoomInItem.setEnabled(true);
 274                 _popup.add(zoomInItem);
 275                 JMenuItem zoomOutItem = new JMenuItem(I18nManager.getText("menu.map.zoomout"));
 276                 zoomOutItem.addActionListener(new ActionListener() {
 277                         public void actionPerformed(ActionEvent e)
 278                         {
 279                                 zoomOut();
 280                         }});
 281                 zoomOutItem.setEnabled(true);
 282                 _popup.add(zoomOutItem);
 283                 JMenuItem zoomFullItem = new JMenuItem(I18nManager.getText("menu.map.zoomfull"));
 284                 zoomFullItem.addActionListener(new ActionListener() {
 285                         public void actionPerformed(ActionEvent e)
 286                         {
 287                                 zoomToFit();
 288                                 _recalculate = true;
 289                                 repaint();
 290                         }});
 291                 zoomFullItem.setEnabled(true);
 292                 _popup.add(zoomFullItem);
 293                 _popup.addSeparator();
 294                 // Set background
 295                 JMenuItem setMapBgItem = new JMenuItem(
 296                         I18nManager.getText(FunctionLibrary.FUNCTION_SET_MAP_BG.getNameKey()));
 297                 setMapBgItem.addActionListener(new ActionListener() {
 298                         public void actionPerformed(ActionEvent e)
 299                         {
 300                                 FunctionLibrary.FUNCTION_SET_MAP_BG.begin();
 301                         }});
 302                 _popup.add(setMapBgItem);
 303                 // new point option
 304                 JMenuItem newPointItem = new JMenuItem(I18nManager.getText("menu.map.newpoint"));
 305                 newPointItem.addActionListener(new ActionListener() {
 306                         public void actionPerformed(ActionEvent e)
 307                         {
 308                                 double lat = MapUtils.getLatitudeFromY(_mapPosition.getYFromPixels(_popupMenuY, getHeight()));
 309                                 double lon = MapUtils.getLongitudeFromX(_mapPosition.getXFromPixels(_popupMenuX, getWidth()));
 310                                 _app.createPoint(new DataPoint(new Latitude(lat, Coordinate.FORMAT_NONE),
 311                                         new Longitude(lon, Coordinate.FORMAT_NONE), null));
 312                         }});
 313                 newPointItem.setEnabled(true);
 314                 _popup.add(newPointItem);
 315         }
 316
 317
 318         /**
 319          * Zoom to fit the current data area
 320          */
 321         private void zoomToFit()
 322         {
 323                 _latRange = _track.getLatRange();
 324                 _lonRange = _track.getLonRange();
 325                 _xRange = new DoubleRange(MapUtils.getXFromLongitude(_lonRange.getMinimum()),
 326                         MapUtils.getXFromLongitude(_lonRange.getMaximum()));
 327                 _yRange = new DoubleRange(MapUtils.getYFromLatitude(_latRange.getMinimum()),
 328                         MapUtils.getYFromLatitude(_latRange.getMaximum()));
 329                 _mapPosition.zoomToXY(_xRange.getMinimum(), _xRange.getMaximum(), _yRange.getMinimum(), _yRange.getMaximum(),
 330                                 getWidth(), getHeight());
 331         }
 332
 333
 334         /**
 335          * Paint method
 336          * @see java.awt.Canvas#paint(java.awt.Graphics)
 337          */
 338         public void paint(Graphics inG)
 339         {
 340                 super.paint(inG);
 341                 if (_mapImage != null && (_mapImage.getWidth() != getWidth() || _mapImage.getHeight() != getHeight())) {
 342                         _mapImage = null;
 343                 }
 344                 if (_track.getNumPoints() > 0)
 345                 {
 346                         // Check for autopan if enabled / necessary
 347                         if (_autopanCheckBox.isSelected())
 348                         {
 349                                 int selectedPoint = _selection.getCurrentPointIndex();
 350                                 if (selectedPoint >= 0 && _dragFromX == -1 && selectedPoint != _prevSelectedPoint)
 351                                 {
 352                                         int px = getWidth() / 2 + _mapPosition.getXFromCentre(_track.getX(selectedPoint));
 353                                         int py = getHeight() / 2 + _mapPosition.getYFromCentre(_track.getY(selectedPoint));
 354                                         int panX = 0;
 355                                         int panY = 0;
 356                                         if (px < PAN_DISTANCE) {
 357                                                 panX = px - AUTOPAN_DISTANCE;
 358                                         }
 359                                         else if (px > (getWidth()-PAN_DISTANCE)) {
 360                                                 panX = AUTOPAN_DISTANCE + px - getWidth();
 361                                         }
 362                                         if (py < PAN_DISTANCE) {
 363                                                 panY = py - AUTOPAN_DISTANCE;
 364                                         }
 365                                         if (py > (getHeight()-PAN_DISTANCE)) {
 366                                                 panY = AUTOPAN_DISTANCE + py - getHeight();
 367                                         }
 368                                         if (panX != 0 || panY != 0) {
 369                                                 _mapPosition.pan(panX, panY);
 370                                         }
 371                                 }
 372                                 _prevSelectedPoint = selectedPoint;
 373                         }
 374
 375                         // Draw the mapImage if necessary
 376                         if ((_mapImage == null || _recalculate))
 377                         {
 378                                 getMapTiles();
 379                                 _scaleBar.updateScale(_mapPosition.getZoom(), _mapPosition.getCentreTileY());
 380                         }
 381                         // Draw the prepared image onto the panel
 382                         if (_mapImage != null) {
 383                                 inG.drawImage(_mapImage, 0, 0, getWidth(), getHeight(), null);
 384                         }
 385                         // Draw the zoom rectangle if necessary
 386                         if (_zoomDragging)
 387                         {
 388                                 inG.setColor(Color.RED);
 389                                 inG.drawLine(_dragFromX, _dragFromY, _dragFromX, _dragToY);
 390                                 inG.drawLine(_dragFromX, _dragFromY, _dragToX, _dragFromY);
 391                                 inG.drawLine(_dragToX, _dragFromY, _dragToX, _dragToY);
 392                                 inG.drawLine(_dragFromX, _dragToY, _dragToX, _dragToY);
 393                         }
 394                 }
 395                 else
 396                 {
 397                         inG.setColor(Config.getColourScheme().getColour(ColourScheme.IDX_BACKGROUND));
 398                         inG.fillRect(0, 0, getWidth(), getHeight());
 399                         inG.setColor(COLOR_MESSAGES);
 400                         inG.drawString(I18nManager.getText("display.nodata"), 50, getHeight()/2);
 401                         _scaleBar.updateScale(-1, 0);
 402                 }
 403                 // Draw slider etc on top
 404                 paintChildren(inG);
 405         }
 406
 407
 408         /**
 409          * Get the map tiles for the current zoom level and given tile parameters
 410          */
 411         private void getMapTiles()
 412         {
 413                 if (_mapImage == null || _mapImage.getWidth() != getWidth() || _mapImage.getHeight() != getHeight())
 414                 {
 415                         _mapImage = new BufferedImage(getWidth(), getHeight(), BufferedImage.TYPE_INT_RGB);
 416                 }
 417
 418                 // Clear map
 419                 Graphics g = _mapImage.getGraphics();
 420                 // Clear to background
 421                 g.setColor(Config.getColourScheme().getColour(ColourScheme.IDX_BACKGROUND));
 422                 g.fillRect(0, 0, getWidth(), getHeight());
 423
 424                 // Check whether maps are on or not
 425                 boolean showMap = Config.getConfigBoolean(Config.KEY_SHOW_MAP);
 426                 _mapCheckBox.setSelected(showMap);
 427
 428                 // reset error message
 429                 if (!showMap) {_shownOsmErrorAlready = false;}
 430                 // Only get map tiles if selected
 431                 if (showMap)
 432                 {
 433                         // init tile cacher
 434                         _tileCacher.centreMap(_mapPosition.getZoom(), _mapPosition.getCentreTileX(), _mapPosition.getCentreTileY());
 435
 436                         boolean loadingFailed = false;
 437                         if (_mapImage == null) return;
 438
 439                         if (_tileCacher.isOverzoomed())
 440                         {
 441                                 // display overzoom message
 442                                 g.setColor(COLOR_MESSAGES);
 443                                 g.drawString(I18nManager.getText("map.overzoom"), 50, getHeight()/2);
 444                         }
 445                         else
 446                         {
 447                                 // Loop over tiles drawing each one
 448                                 int[] tileIndices = _mapPosition.getTileIndices(getWidth(), getHeight());
 449                                 int[] pixelOffsets = _mapPosition.getDisplayOffsets(getWidth(), getHeight());
 450                                 for (int tileX = tileIndices[0]; tileX <= tileIndices[1] && !loadingFailed; tileX++)
 451                                 {
 452                                         int x = (tileX - tileIndices[0]) * 256 - pixelOffsets[0];
 453                                         for (int tileY = tileIndices[2]; tileY <= tileIndices[3]; tileY++)
 454                                         {
 455                                                 int y = (tileY - tileIndices[2]) * 256 - pixelOffsets[1];
 456                                                 Image image = _tileCacher.getTile(tileX, tileY);
 457                                                 if (image != null) {
 458                                                         g.drawImage(image, x, y, 256, 256, null);
 459                                                 }
 460                                         }
 461                                 }
 462
 463                                 // Make maps brighter / fainter
 464                                 float[] scaleFactors = {1.0f, 1.05f, 1.1f, 1.2f, 1.6f, 2.0f};
 465                                 float scaleFactor = scaleFactors[_transparencySlider.getValue()];
 466                                 if (scaleFactor > 1.0f)
 467                                 {
 468                                         RenderingHints hints = new RenderingHints(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_OFF);
 469                                         hints.put(RenderingHints.KEY_RENDERING, RenderingHints.VALUE_RENDER_QUALITY);
 470                                         RescaleOp op = new RescaleOp(scaleFactor, 0, hints);
 471                                         op.filter(_mapImage, _mapImage);
 472                                 }
 473                         }
 474                 }
 475
 476                 // Paint the track points on top
 477                 int pointsPainted = 1;
 478                 try
 479                 {
 480                         pointsPainted = paintPoints(g);
 481                 }
 482                 catch (NullPointerException npe) { // ignore, probably due to data being changed during drawing
 483                 }
 484
 485                 // free g
 486                 g.dispose();
 487
 488                 _recalculate = false;
 489                 // Zoom to fit if no points found
 490                 if (pointsPainted <= 0 && _checkBounds) {
 491                         zoomToFit();
 492                         _recalculate = true;
 493                         repaint();
 494                 }
 495                 _checkBounds = false;
 496                 // enable / disable transparency slider
 497                 _transparencySlider.setEnabled(showMap);
 498         }
 499
 500
 501         /**
 502          * Paint the points using the given graphics object
 503          * @param inG Graphics object to use for painting
 504          * @return number of points painted, if any
 505          */
 506         private int paintPoints(Graphics inG)
 507         {
 508                 // Set up colours
 509                 final Color pointColour = Config.getColourScheme().getColour(ColourScheme.IDX_POINT);
 510                 final Color rangeColour = Config.getColourScheme().getColour(ColourScheme.IDX_SELECTION);
 511                 final Color currentColour = Config.getColourScheme().getColour(ColourScheme.IDX_PRIMARY);
 512                 final Color secondColour = Config.getColourScheme().getColour(ColourScheme.IDX_SECONDARY);
 513                 final Color textColour = Config.getColourScheme().getColour(ColourScheme.IDX_TEXT);
 514
 515                 int pointsPainted = 0;
 516                 // draw track points
 517                 inG.setColor(pointColour);
 518                 int prevX = -1, prevY = -1;
 519                 boolean connectPoints = _connectCheckBox.isSelected();
 520                 boolean prevPointVisible = false, currPointVisible = false;
 521                 boolean anyWaypoints = false;
 522                 boolean isWaypoint = false;
 523                 for (int i=0; i<_track.getNumPoints(); i++)
 524                 {
 525                         int px = getWidth() / 2 + _mapPosition.getXFromCentre(_track.getX(i));
 526                         int py = getHeight() / 2 + _mapPosition.getYFromCentre(_track.getY(i));
 527                         currPointVisible = px >= 0 && px < getWidth() && py >= 0 && py < getHeight();
 528                         isWaypoint = _track.getPoint(i).isWaypoint();
 529                         anyWaypoints = anyWaypoints || isWaypoint;
 530                         if (currPointVisible)
 531                         {
 532                                 if (!isWaypoint)
 533                                 {
 534                                         // Draw rectangle for track point
 535                                         if (_track.getPoint(i).getDeleteFlag()) {
 536                                                 inG.setColor(currentColour);
 537                                         }
 538                                         else {
 539                                                 inG.setColor(pointColour);
 540                                         }
 541                                         inG.drawRect(px-2, py-2, 3, 3);
 542                                         pointsPainted++;
 543                                 }
 544                         }
 545                         if (!isWaypoint)
 546                         {
 547                                 // Connect track points if either of them are visible
 548                                 if (connectPoints && (currPointVisible || prevPointVisible)
 549                                  && !(prevX == -1 && prevY == -1)
 550                                  && !_track.getPoint(i).getSegmentStart())
 551                                 {
 552                                         inG.drawLine(prevX, prevY, px, py);
 553                                 }
 554                                 prevX = px; prevY = py;
 555                         }
 556                         prevPointVisible = currPointVisible;
 557                 }
 558
 559                 // Loop over points, just drawing blobs for waypoints
 560                 inG.setColor(textColour);
 561                 FontMetrics fm = inG.getFontMetrics();
 562                 int nameHeight = fm.getHeight();
 563                 int width = getWidth();
 564                 int height = getHeight();
 565                 if (anyWaypoints) {
 566                         for (int i=0; i<_track.getNumPoints(); i++)
 567                         {
 568                                 if (_track.getPoint(i).isWaypoint())
 569                                 {
 570                                         int px = getWidth() / 2 + _mapPosition.getXFromCentre(_track.getX(i));
 571                                         int py = getHeight() / 2 + _mapPosition.getYFromCentre(_track.getY(i));
 572                                         if (px >= 0 && px < getWidth() && py >= 0 && py < getHeight())
 573                                         {
 574                                                 inG.fillRect(px-3, py-3, 6, 6);
 575                                                 pointsPainted++;
 576                                         }
 577                                 }
 578                         }
 579                         // Loop over points again, now draw names for waypoints
 580                         for (int i=0; i<_track.getNumPoints(); i++)
 581                         {
 582                                 if (_track.getPoint(i).isWaypoint())
 583                                 {
 584                                         int px = getWidth() / 2 + _mapPosition.getXFromCentre(_track.getX(i));
 585                                         int py = getHeight() / 2 + _mapPosition.getYFromCentre(_track.getY(i));
 586                                         if (px >= 0 && px < getWidth() && py >= 0 && py < getHeight())
 587                                         {
 588                                                 // Figure out where to draw waypoint name so it doesn't obscure track
 589                                                 String waypointName = _track.getPoint(i).getWaypointName();
 590                                                 int nameWidth = fm.stringWidth(waypointName);
 591                                                 boolean drawnName = false;
 592                                                 // Make arrays for coordinates right left up down
 593                                                 int[] nameXs = {px + 2, px - nameWidth - 2, px - nameWidth/2, px - nameWidth/2};
 594                                                 int[] nameYs = {py + (nameHeight/2), py + (nameHeight/2), py - 2, py + nameHeight + 2};
 595                                                 for (int extraSpace = 4; extraSpace < 13 && !drawnName; extraSpace+=2)
 596                                                 {
 597                                                         // Shift arrays for coordinates right left up down
 598                                                         nameXs[0] += 2; nameXs[1] -= 2;
 599                                                         nameYs[2] -= 2; nameYs[3] += 2;
 600                                                         // Check each direction in turn right left up down
 601                                                         for (int a=0; a<4; a++)
 602                                                         {
 603                                                                 if (nameXs[a] > 0 && (nameXs[a] + nameWidth) < width
 604                                                                         && nameYs[a] < height && (nameYs[a] - nameHeight) > 0
 605                                                                         && !overlapsPoints(nameXs[a], nameYs[a], nameWidth, nameHeight, textColour))
 606                                                                 {
 607                                                                         // Found a rectangle to fit - draw name here and quit
 608                                                                         inG.drawString(waypointName, nameXs[a], nameYs[a]);
 609                                                                         drawnName = true;
 610                                                                         break;
 611                                                                 }
 612                                                         }
 613                                                 }
 614                                         }
 615                                 }
 616                         }
 617                 }
 618                 // Loop over points, drawing blobs for photo points
 619                 inG.setColor(secondColour);
 620                 for (int i=0; i<_track.getNumPoints(); i++)
 621                 {
 622                         if (_track.getPoint(i).getPhoto() != null)
 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                                         inG.drawRect(px-1, py-1, 2, 2);
 629                                         inG.drawRect(px-2, py-2, 4, 4);
 630                                         pointsPainted++;
 631                                 }
 632                         }
 633                 }
 634
 635                 // Draw selected range
 636                 if (_selection.hasRangeSelected())
 637                 {
 638                         inG.setColor(rangeColour);
 639                         for (int i=_selection.getStart(); i<=_selection.getEnd(); i++)
 640                         {
 641                                 int px = getWidth() / 2 + _mapPosition.getXFromCentre(_track.getX(i));
 642                                 int py = getHeight() / 2 + _mapPosition.getYFromCentre(_track.getY(i));
 643                                 inG.drawRect(px-1, py-1, 2, 2);
 644                         }
 645                 }
 646
 647                 // Draw selected point, crosshairs
 648                 int selectedPoint = _selection.getCurrentPointIndex();
 649                 if (selectedPoint >= 0)
 650                 {
 651                         int px = getWidth() / 2 + _mapPosition.getXFromCentre(_track.getX(selectedPoint));
 652                         int py = getHeight() / 2 + _mapPosition.getYFromCentre(_track.getY(selectedPoint));
 653                         inG.setColor(currentColour);
 654                         // crosshairs
 655                         inG.drawLine(px, 0, px, getHeight());
 656                         inG.drawLine(0, py, getWidth(), py);
 657                         // oval
 658                         inG.drawOval(px - 2, py - 2, 4, 4);
 659                         inG.drawOval(px - 3, py - 3, 6, 6);
 660                 }
 661                 // Return the number of points painted
 662                 return pointsPainted;
 663         }
 664
 665
 666         /**
 667          * Tests whether there are any dark pixels within the specified x,y rectangle
 668          * @param inX left X coordinate
 669          * @param inY bottom Y coordinate
 670          * @param inWidth width of rectangle
 671          * @param inHeight height of rectangle
 672          * @param inTextColour colour of text
 673          * @return true if the rectangle overlaps stuff too close to the given colour
 674          */
 675         private boolean overlapsPoints(int inX, int inY, int inWidth, int inHeight, Color inTextColour)
 676         {
 677                 // each of the colour channels must be further away than this to count as empty
 678                 final int BRIGHTNESS_LIMIT = 80;
 679                 final int textRGB = inTextColour.getRGB();
 680                 final int textLow = textRGB & 255;
 681                 final int textMid = (textRGB >> 8) & 255;
 682                 final int textHigh = (textRGB >> 16) & 255;
 683                 try
 684                 {
 685                         // loop over x coordinate of rectangle
 686                         for (int x=0; x<inWidth; x++)
 687                         {
 688                                 // loop over y coordinate of rectangle
 689                                 for (int y=0; y<inHeight; y++)
 690                                 {
 691                                         int pixelColor = _mapImage.getRGB(inX + x, inY - y);
 692                                         // split into four components rgba
 693                                         int pixLow = pixelColor & 255;
 694                                         int pixMid = (pixelColor >> 8) & 255;
 695                                         int pixHigh = (pixelColor >> 16) & 255;
 696                                         //int fourthBit = (pixelColor >> 24) & 255; // alpha ignored
 697                                         // If colours are too close in any channel then it's an overlap
 698                                         if (Math.abs(pixLow-textLow) < BRIGHTNESS_LIMIT ||
 699                                                 Math.abs(pixMid-textMid) < BRIGHTNESS_LIMIT ||
 700                                                 Math.abs(pixHigh-textHigh) < BRIGHTNESS_LIMIT) {return true;}
 701                                 }
 702                         }
 703                 }
 704                 catch (NullPointerException e) {
 705                         // ignore null pointers, just return false
 706                 }
 707                 return false;
 708         }
 709
 710
 711         /**
 712          * Inform that tiles have been updated and the map can be repainted
 713          * @param inIsOk true if data loaded ok, false for error
 714          */
 715         public synchronized void tilesUpdated(boolean inIsOk)
 716         {
 717                 // Show message if loading failed (but not too many times)
 718                 if (!inIsOk && !_shownOsmErrorAlready && _mapCheckBox.isSelected())
 719                 {
 720                         _shownOsmErrorAlready = true;
 721                         // use separate thread to show message about failing to load osm images
 722                         new Thread(new Runnable() {
 723                                 public void run() {
 724                                         try {Thread.sleep(500);} catch (InterruptedException ie) {}
 725                                         _app.showErrorMessage("error.osmimage.dialogtitle", "error.osmimage.failed");
 726                                 }
 727                         }).start();
 728                 }
 729                 _recalculate = true;
 730                 repaint();
 731         }
 732
 733         /**
 734          * Zoom out, if not already at minimum zoom
 735          */
 736         public void zoomOut()
 737         {
 738                 _mapPosition.zoomOut();
 739                 _recalculate = true;
 740                 repaint();
 741         }
 742
 743         /**
 744          * Zoom in, if not already at maximum zoom
 745          */
 746         public void zoomIn()
 747         {
 748                 _mapPosition.zoomIn();
 749                 _recalculate = true;
 750                 repaint();
 751         }
 752
 753         /**
 754          * Pan map
 755          * @param inDeltaX x shift
 756          * @param inDeltaY y shift
 757          */
 758         public void panMap(int inDeltaX, int inDeltaY)
 759         {
 760                 _mapPosition.pan(inDeltaX, inDeltaY);
 761                 _recalculate = true;
 762                 repaint();
 763         }
 764
 765         /**
 766          * @see javax.swing.JComponent#getMinimumSize()
 767          */
 768         public Dimension getMinimumSize()
 769         {
 770                 final Dimension minSize = new Dimension(512, 300);
 771                 return minSize;
 772         }
 773
 774         /**
 775          * @see javax.swing.JComponent#getPreferredSize()
 776          */
 777         public Dimension getPreferredSize()
 778         {
 779                 return getMinimumSize();
 780         }
 781
 782
 783         /**
 784          * Respond to mouse click events
 785          * @see java.awt.event.MouseListener#mouseClicked(java.awt.event.MouseEvent)
 786          */
 787         public void mouseClicked(MouseEvent inE)
 788         {
 789                 if (_track != null && _track.getNumPoints() > 0)
 790                 {
 791                          // select point if it's a left-click
 792                         if (!inE.isMetaDown())
 793                         {
 794                                 int pointIndex = _track.getNearestPointIndex(
 795                                          _mapPosition.getXFromPixels(inE.getX(), getWidth()),
 796                                          _mapPosition.getYFromPixels(inE.getY(), getHeight()),
 797                                          _mapPosition.getBoundsFromPixels(CLICK_SENSITIVITY), false);
 798                                 // Extend selection for shift-click
 799                                 if (inE.isShiftDown()) {
 800                                         _trackInfo.extendSelection(pointIndex);
 801                                 }
 802                                 else {
 803                                         _trackInfo.selectPoint(pointIndex);
 804                                 }
 805                         }
 806                         else
 807                         {
 808                                 // show the popup menu for right-clicks
 809                                 _popupMenuX = inE.getX();
 810                                 _popupMenuY = inE.getY();
 811                                 _popup.show(this, _popupMenuX, _popupMenuY);
 812                         }
 813                 }
 814         }
 815
 816         /**
 817          * Ignore mouse enter events
 818          * @see java.awt.event.MouseListener#mouseEntered(java.awt.event.MouseEvent)
 819          */
 820         public void mouseEntered(MouseEvent inE)
 821         {
 822                 // ignore
 823         }
 824
 825         /**
 826          * Ignore mouse exited events
 827          * @see java.awt.event.MouseListener#mouseExited(java.awt.event.MouseEvent)
 828          */
 829         public void mouseExited(MouseEvent inE)
 830         {
 831                 // ignore
 832         }
 833
 834         /**
 835          * Ignore mouse pressed events
 836          * @see java.awt.event.MouseListener#mousePressed(java.awt.event.MouseEvent)
 837          */
 838         public void mousePressed(MouseEvent inE)
 839         {
 840                 // ignore
 841         }
 842
 843         /**
 844          * Respond to mouse released events
 845          * @see java.awt.event.MouseListener#mouseReleased(java.awt.event.MouseEvent)
 846          */
 847         public void mouseReleased(MouseEvent inE)
 848         {
 849                 _recalculate = true;
 850                 if (_zoomDragging && Math.abs(_dragToX - _dragFromX) > 20 && Math.abs(_dragToY - _dragFromY) > 20)
 851                 {
 852                         //System.out.println("Finished zoom: " + _dragFromX + ", " + _dragFromY + " to " + _dragToX + ", " + _dragToY);
 853                         _mapPosition.zoomToPixels(_dragFromX, _dragToX, _dragFromY, _dragToY, getWidth(), getHeight());
 854                 }
 855                 _dragFromX = _dragFromY = -1;
 856                 _zoomDragging = false;
 857                 repaint();
 858         }
 859
 860         /**
 861          * Respond to mouse drag events
 862          * @see java.awt.event.MouseMotionListener#mouseDragged(java.awt.event.MouseEvent)
 863          */
 864         public void mouseDragged(MouseEvent inE)
 865         {
 866                 if (!inE.isMetaDown())
 867                 {
 868                         // Left mouse drag - pan map by appropriate amount
 869                         _zoomDragging = false;
 870                         if (_dragFromX != -1)
 871                         {
 872                                 panMap(_dragFromX - inE.getX(), _dragFromY - inE.getY());
 873                                 _recalculate = true;
 874                                 repaint();
 875                         }
 876                         _dragFromX = inE.getX();
 877                         _dragFromY = inE.getY();
 878                 }
 879                 else
 880                 {
 881                         // Right-click and drag - draw rectangle and control zoom
 882                         _zoomDragging = true;
 883                         if (_dragFromX == -1) {
 884                                 _dragFromX = inE.getX();
 885                                 _dragFromY = inE.getY();
 886                         }
 887                         _dragToX = inE.getX();
 888                         _dragToY = inE.getY();
 889                         repaint();
 890                 }
 891         }
 892
 893         /**
 894          * Respond to mouse move events without button pressed
 895          * @param inEvent ignored
 896          */
 897         public void mouseMoved(MouseEvent inEvent)
 898         {
 899                 // ignore
 900         }
 901
 902         /**
 903          * Respond to status bar message from broker
 904          * @param inMessage message, ignored
 905          */
 906         public void actionCompleted(String inMessage)
 907         {
 908                 // ignore
 909         }
 910
 911         /**
 912          * Respond to data updated message from broker
 913          * @param inUpdateType type of update
 914          */
 915         public void dataUpdated(byte inUpdateType)
 916         {
 917                 _recalculate = true;
 918                 if ((inUpdateType & DataSubscriber.DATA_ADDED_OR_REMOVED) > 0) {
 919                         _checkBounds = true;
 920                 }
 921                 if ((inUpdateType & DataSubscriber.MAPSERVER_CHANGED) > 0) {
 922                         _tileCacher.setTileConfig(new MapTileConfig());
 923                 }
 924                 repaint();
 925                 // enable or disable components
 926                 boolean hasData = _track.getNumPoints() > 0;
 927                 _topPanel.setVisible(hasData);
 928                 _sidePanel.setVisible(hasData);
 929                 // grab focus for the key presses
 930                 this.requestFocus();
 931         }
 932
 933         /**
 934          * Respond to key presses on the map canvas
 935          * @param inE key event
 936          */
 937         public void keyPressed(KeyEvent inE)
 938         {
 939                 int code = inE.getKeyCode();
 940                 int currPointIndex = _selection.getCurrentPointIndex();
 941                 // Check for meta key
 942                 if (inE.isControlDown())
 943                 {
 944                         // Check for arrow keys to zoom in and out
 945                         if (code == KeyEvent.VK_UP)
 946                                 zoomIn();
 947                         else if (code == KeyEvent.VK_DOWN)
 948                                 zoomOut();
 949                         // Key nav for next/prev point
 950                         else if (code == KeyEvent.VK_LEFT && currPointIndex > 0)
 951                                 _trackInfo.selectPoint(currPointIndex-1);
 952                         else if (code == KeyEvent.VK_RIGHT)
 953                                 _trackInfo.selectPoint(currPointIndex+1);
 954                 }
 955                 else
 956                 {
 957                         // Check for arrow keys to pan
 958                         int upwardsPan = 0;
 959                         if (code == KeyEvent.VK_UP)
 960                                 upwardsPan = -PAN_DISTANCE;
 961                         else if (code == KeyEvent.VK_DOWN)
 962                                 upwardsPan = PAN_DISTANCE;
 963                         int rightwardsPan = 0;
 964                         if (code == KeyEvent.VK_RIGHT)
 965                                 rightwardsPan = PAN_DISTANCE;
 966                         else if (code == KeyEvent.VK_LEFT)
 967                                 rightwardsPan = -PAN_DISTANCE;
 968                         panMap(rightwardsPan, upwardsPan);
 969                         // Check for delete key to delete current point
 970                         if (code == KeyEvent.VK_DELETE && currPointIndex >= 0)
 971                         {
 972                                 _app.deleteCurrentPoint();
 973                         }
 974                 }
 975         }
 976
 977         /**
 978          * @param inE key released event, ignored
 979          */
 980         public void keyReleased(KeyEvent e)
 981         {
 982                 // ignore
 983         }
 984
 985         /**
 986          * @param inE key typed event, ignored
 987          */
 988         public void keyTyped(KeyEvent inE)
 989         {
 990                 // ignore
 991         }
 992
 993         /**
 994          * @param inE mouse wheel event indicating scroll direction
 995          */
 996         public void mouseWheelMoved(MouseWheelEvent inE)
 997         {
 998                 int clicks = inE.getWheelRotation();
 999                 if (clicks < 0)
1000                         zoomIn();
1001                 else if (clicks > 0)
1002                         zoomOut();
1003         }
1004
1005         /**
1006          * @return current map position
1007          */
1008         public MapPosition getMapPosition()
1009         {
1010                 return _mapPosition;
1011         }
1012 }