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.JOptionPane;
  31 import javax.swing.JPanel;
  32 import javax.swing.JPopupMenu;
  33 import javax.swing.JSlider;
  34 import javax.swing.event.ChangeEvent;
  35 import javax.swing.event.ChangeListener;
  36
  37 import tim.prune.App;
  38 import tim.prune.DataSubscriber;
  39 import tim.prune.I18nManager;
  40 import tim.prune.data.DoubleRange;
  41 import tim.prune.data.Selection;
  42 import tim.prune.data.Track;
  43 import tim.prune.data.TrackInfo;
  44 import tim.prune.gui.IconManager;
  45
  46 /**
  47  * Class for the map canvas, to display a background map and draw on it
  48  */
  49 public class MapCanvas extends JPanel implements MouseListener, MouseMotionListener, DataSubscriber,
  50         KeyListener, MouseWheelListener
  51 {
  52         /** App object for callbacks */
  53         private App _app = null;
  54         /** Track object */
  55         private Track _track = null;
  56         /** Selection object */
  57         private Selection _selection = null;
  58         /** Previously selected point */
  59         private int _prevSelectedPoint = -1;
  60         /** Tile cacher */
  61         private MapTileCacher _tileCacher = new MapTileCacher(this);
  62         /** Image to display */
  63         private BufferedImage _mapImage = null;
  64         /** Slider for transparency */
  65         private JSlider _transparencySlider = null;
  66         /** Checkbox for maps */
  67         private JCheckBox _mapCheckBox = null;
  68         /** Checkbox for autopan */
  69         private JCheckBox _autopanCheckBox = null;
  70         /** Checkbox for connecting track points */
  71         private JCheckBox _connectCheckBox = null;
  72         /** Right-click popup menu */
  73         private JPopupMenu _popup = null;
  74         /** Top component panel */
  75         private JPanel _topPanel = null;
  76         /** Side component panel */
  77         private JPanel _sidePanel = null;
  78         /* Data */
  79         private DoubleRange _latRange = null, _lonRange = null;
  80         private DoubleRange _xRange = null, _yRange = null;
  81         private boolean _recalculate = false;
  82         /** Flag to check bounds on next paint */
  83         private boolean _checkBounds = false;
  84         /** Map position */
  85         private MapPosition _mapPosition = null;
  86         /** x coordinate of drag from point */
  87         private int _dragFromX = -1;
  88         /** y coordinate of drag from point */
  89         private int _dragFromY = -1;
  90         /** Flag set to true for right-click dragging */
  91         private boolean _zoomDragging = false;
  92         /** x coordinate of drag to point */
  93         private int _dragToX = -1;
  94         /** y coordinate of drag to point */
  95         private int _dragToY = -1;
  96         /** x coordinate of popup menu */
  97         private int _popupMenuX = -1;
  98         /** y coordinate of popup menu */
  99         private int _popupMenuY = -1;
 100         /** Flag to prevent showing too often the error message about loading maps */
 101         private boolean _shownOsmErrorAlready = false;
 102
 103         /** Constant for click sensitivity when selecting nearest point */
 104         private static final int CLICK_SENSITIVITY = 10;
 105         /** Constant for pan distance from key presses */
 106         private static final int PAN_DISTANCE = 20;
 107         /** Constant for pan distance from autopan */
 108         private static final int AUTOPAN_DISTANCE = 75;
 109
 110         // Colours
 111         private static final Color COLOR_BG         = Color.WHITE;
 112         private static final Color COLOR_POINT      = Color.BLUE;
 113         private static final Color COLOR_CURR_RANGE = Color.GREEN;
 114         private static final Color COLOR_CROSSHAIRS = Color.RED;
 115         private static final Color COLOR_WAYPT_NAME = Color.BLACK;
 116         private static final Color COLOR_PHOTO_PT   = Color.ORANGE;
 117
 118
 119         /**
 120          * Constructor
 121          * @param inApp App object for callbacks
 122          * @param inTrackInfo track info object
 123          */
 124         public MapCanvas(App inApp, TrackInfo inTrackInfo)
 125         {
 126                 _app = inApp;
 127                 _track = inTrackInfo.getTrack();
 128                 _selection = inTrackInfo.getSelection();
 129                 _mapPosition = new MapPosition();
 130                 addMouseListener(this);
 131                 addMouseMotionListener(this);
 132                 addMouseWheelListener(this);
 133                 addKeyListener(this);
 134
 135                 // Make listener for changes to controls
 136                 ItemListener itemListener = new ItemListener() {
 137                         public void itemStateChanged(ItemEvent e)
 138                         {
 139                                 _recalculate = true;
 140                                 repaint();
 141                         }
 142                 };
 143                 // Make special listener for changes to map checkbox
 144                 ItemListener mapCheckListener = new ItemListener() {
 145                         public void itemStateChanged(ItemEvent e)
 146                         {
 147                                 _tileCacher.clearAll();
 148                                 _recalculate = true;
 149                                 repaint();
 150                         }
 151                 };
 152                 _topPanel = new JPanel();
 153                 _topPanel.setLayout(new FlowLayout());
 154                 _topPanel.setOpaque(false);
 155                 // Make slider for transparency
 156                 _transparencySlider = new JSlider(0, 5, 0);
 157                 _transparencySlider.setPreferredSize(new Dimension(100, 20));
 158                 _transparencySlider.setMajorTickSpacing(1);
 159                 _transparencySlider.setSnapToTicks(true);
 160                 _transparencySlider.setOpaque(false);
 161                 _transparencySlider.addChangeListener(new ChangeListener() {
 162                         public void stateChanged(ChangeEvent e)
 163                         {
 164                                 _recalculate = true;
 165                                 repaint();
 166                         }
 167                 });
 168                 _transparencySlider.setFocusable(false); // stop slider from stealing keyboard focus
 169                 _topPanel.add(_transparencySlider);
 170                 // Add checkbox button for enabling maps or not
 171                 _mapCheckBox = new JCheckBox(IconManager.getImageIcon(IconManager.MAP_BUTTON), false);
 172                 _mapCheckBox.setSelectedIcon(IconManager.getImageIcon(IconManager.MAP_BUTTON_ON));
 173                 _mapCheckBox.setOpaque(false);
 174                 _mapCheckBox.setToolTipText(I18nManager.getText("menu.map.showmap"));
 175                 _mapCheckBox.addItemListener(mapCheckListener);
 176                 _mapCheckBox.setFocusable(false); // stop button from stealing keyboard focus
 177                 _topPanel.add(_mapCheckBox);
 178                 // Add checkbox button for enabling autopan or not
 179                 _autopanCheckBox = new JCheckBox(IconManager.getImageIcon(IconManager.AUTOPAN_BUTTON), true);
 180                 _autopanCheckBox.setSelectedIcon(IconManager.getImageIcon(IconManager.AUTOPAN_BUTTON_ON));
 181                 _autopanCheckBox.setOpaque(false);
 182                 _autopanCheckBox.setToolTipText(I18nManager.getText("menu.map.autopan"));
 183                 _autopanCheckBox.addItemListener(itemListener);
 184                 _autopanCheckBox.setFocusable(false); // stop button from stealing keyboard focus
 185                 _topPanel.add(_autopanCheckBox);
 186                 // Add checkbox button for connecting points or not
 187                 _connectCheckBox = new JCheckBox(IconManager.getImageIcon(IconManager.POINTS_DISCONNECTED_BUTTON), true);
 188                 _connectCheckBox.setSelectedIcon(IconManager.getImageIcon(IconManager.POINTS_CONNECTED_BUTTON));
 189                 _connectCheckBox.setOpaque(false);
 190                 _connectCheckBox.setToolTipText(I18nManager.getText("menu.map.connect"));
 191                 _connectCheckBox.addItemListener(itemListener);
 192                 _connectCheckBox.setFocusable(false); // stop button from stealing keyboard focus
 193                 _topPanel.add(_connectCheckBox);
 194
 195                 // Add zoom in, zoom out buttons
 196                 _sidePanel = new JPanel();
 197                 _sidePanel.setLayout(new BoxLayout(_sidePanel, BoxLayout.Y_AXIS));
 198                 _sidePanel.setOpaque(false);
 199                 JButton zoomInButton = new JButton(IconManager.getImageIcon(IconManager.ZOOM_IN_BUTTON));
 200                 zoomInButton.setBorder(BorderFactory.createEmptyBorder(3, 3, 3, 3));
 201                 zoomInButton.setContentAreaFilled(false);
 202                 zoomInButton.setToolTipText(I18nManager.getText("menu.map.zoomin"));
 203                 zoomInButton.addActionListener(new ActionListener() {
 204                         public void actionPerformed(ActionEvent e)
 205                         {
 206                                 zoomIn();
 207                         }
 208                 });
 209                 zoomInButton.setFocusable(false); // stop button from stealing keyboard focus
 210                 _sidePanel.add(zoomInButton);
 211                 JButton zoomOutButton = new JButton(IconManager.getImageIcon(IconManager.ZOOM_OUT_BUTTON));
 212                 zoomOutButton.setBorder(BorderFactory.createEmptyBorder(3, 3, 3, 3));
 213                 zoomOutButton.setContentAreaFilled(false);
 214                 zoomOutButton.setToolTipText(I18nManager.getText("menu.map.zoomout"));
 215                 zoomOutButton.addActionListener(new ActionListener() {
 216                         public void actionPerformed(ActionEvent e)
 217                         {
 218                                 zoomOut();
 219                         }
 220                 });
 221                 zoomOutButton.setFocusable(false); // stop button from stealing keyboard focus
 222                 _sidePanel.add(zoomOutButton);
 223
 224                 // add control panels to this one
 225                 setLayout(new BorderLayout());
 226                 _topPanel.setVisible(false);
 227                 _sidePanel.setVisible(false);
 228                 add(_topPanel, BorderLayout.NORTH);
 229                 add(_sidePanel, BorderLayout.WEST);
 230                 // Make popup menu
 231                 makePopup();
 232         }
 233
 234
 235         /**
 236          * Make the popup menu for right-clicking the map
 237          */
 238         private void makePopup()
 239         {
 240                 _popup = new JPopupMenu();
 241                 JMenuItem zoomInItem = new JMenuItem(I18nManager.getText("menu.map.zoomin"));
 242                 zoomInItem.addActionListener(new ActionListener() {
 243                         public void actionPerformed(ActionEvent e)
 244                         {
 245                                 zoomIn();
 246                         }});
 247                 zoomInItem.setEnabled(true);
 248                 _popup.add(zoomInItem);
 249                 JMenuItem zoomOutItem = new JMenuItem(I18nManager.getText("menu.map.zoomout"));
 250                 zoomOutItem.addActionListener(new ActionListener() {
 251                         public void actionPerformed(ActionEvent e)
 252                         {
 253                                 zoomOut();
 254                         }});
 255                 zoomOutItem.setEnabled(true);
 256                 _popup.add(zoomOutItem);
 257                 JMenuItem zoomFullItem = new JMenuItem(I18nManager.getText("menu.map.zoomfull"));
 258                 zoomFullItem.addActionListener(new ActionListener() {
 259                         public void actionPerformed(ActionEvent e)
 260                         {
 261                                 zoomToFit();
 262                                 _recalculate = true;
 263                                 repaint();
 264                         }});
 265                 zoomFullItem.setEnabled(true);
 266                 _popup.add(zoomFullItem);
 267                 // new point option
 268                 JMenuItem newPointItem = new JMenuItem(I18nManager.getText("menu.map.newpoint"));
 269                 newPointItem.addActionListener(new ActionListener() {
 270                         public void actionPerformed(ActionEvent e)
 271                         {
 272                                 _app.createPoint(MapUtils.getLatitudeFromY(_mapPosition.getYFromPixels(_popupMenuY, getHeight())),
 273                                         MapUtils.getLongitudeFromX(_mapPosition.getXFromPixels(_popupMenuX, getWidth())));
 274                         }});
 275                 newPointItem.setEnabled(true);
 276                 _popup.add(newPointItem);
 277         }
 278
 279
 280         /**
 281          * Zoom to fit the current data area
 282          */
 283         private void zoomToFit()
 284         {
 285                 _latRange = _track.getLatRange();
 286                 _lonRange = _track.getLonRange();
 287                 _xRange = new DoubleRange(MapUtils.getXFromLongitude(_lonRange.getMinimum()),
 288                         MapUtils.getXFromLongitude(_lonRange.getMaximum()));
 289                 _yRange = new DoubleRange(MapUtils.getYFromLatitude(_latRange.getMinimum()),
 290                         MapUtils.getYFromLatitude(_latRange.getMaximum()));
 291                 _mapPosition.zoomToXY(_xRange.getMinimum(), _xRange.getMaximum(), _yRange.getMinimum(), _yRange.getMaximum(),
 292                                 getWidth(), getHeight());
 293         }
 294
 295
 296         /**
 297          * Paint method
 298          * @see java.awt.Canvas#paint(java.awt.Graphics)
 299          */
 300         public void paint(Graphics inG)
 301         {
 302                 super.paint(inG);
 303                 if (_mapImage != null && (_mapImage.getWidth() != getWidth() || _mapImage.getHeight() != getHeight())) {
 304                         _mapImage = null;
 305                 }
 306                 if (_track.getNumPoints() > 0)
 307                 {
 308                         // Check for autopan if enabled / necessary
 309                         if (_autopanCheckBox.isSelected())
 310                         {
 311                                 int selectedPoint = _selection.getCurrentPointIndex();
 312                                 if (selectedPoint > 0 && _dragFromX == -1 && selectedPoint != _prevSelectedPoint)
 313                                 {
 314                                         int px = getWidth() / 2 + _mapPosition.getXFromCentre(_track.getXNew(selectedPoint));
 315                                         int py = getHeight() / 2 + _mapPosition.getYFromCentre(_track.getYNew(selectedPoint));
 316                                         int panX = 0;
 317                                         int panY = 0;
 318                                         if (px < PAN_DISTANCE) {
 319                                                 panX = px - AUTOPAN_DISTANCE;
 320                                         }
 321                                         else if (px > (getWidth()-PAN_DISTANCE)) {
 322                                                 panX = AUTOPAN_DISTANCE + px - getWidth();
 323                                         }
 324                                         if (py < PAN_DISTANCE) {
 325                                                 panY = py - AUTOPAN_DISTANCE;
 326                                         }
 327                                         if (py > (getHeight()-PAN_DISTANCE)) {
 328                                                 panY = AUTOPAN_DISTANCE + py - getHeight();
 329                                         }
 330                                         if (panX != 0 || panY != 0) {
 331                                                 _mapPosition.pan(panX, panY);
 332                                         }
 333                                 }
 334                                 _prevSelectedPoint = selectedPoint;
 335                         }
 336
 337                         // Draw the mapImage if necessary
 338                         if ((_mapImage == null || _recalculate)) {
 339                                 getMapTiles();
 340                         }
 341                         // Draw the prepared image onto the panel
 342                         if (_mapImage != null) {
 343                                 inG.drawImage(_mapImage, 0, 0, getWidth(), getHeight(), null);
 344                         }
 345                         // Draw the zoom rectangle if necessary
 346                         if (_zoomDragging)
 347                         {
 348                                 inG.setColor(Color.RED);
 349                                 inG.drawLine(_dragFromX, _dragFromY, _dragFromX, _dragToY);
 350                                 inG.drawLine(_dragFromX, _dragFromY, _dragToX, _dragFromY);
 351                                 inG.drawLine(_dragToX, _dragFromY, _dragToX, _dragToY);
 352                                 inG.drawLine(_dragFromX, _dragToY, _dragToX, _dragToY);
 353                         }
 354                 }
 355                 else
 356                 {
 357                         inG.setColor(COLOR_BG);
 358                         inG.fillRect(0, 0, getWidth(), getHeight());
 359                         inG.setColor(Color.GRAY);
 360                         inG.drawString(I18nManager.getText("display.nodata"), 50, getHeight()/2);
 361                 }
 362                 // Draw slider etc on top
 363                 paintChildren(inG);
 364         }
 365
 366
 367         /**
 368          * Get the map tiles for the current zoom level and given tile parameters
 369          */
 370         private void getMapTiles()
 371         {
 372                 if (_mapImage == null || _mapImage.getWidth() != getWidth() || _mapImage.getHeight() != getHeight())
 373                 {
 374                         _mapImage = new BufferedImage(getWidth(), getHeight(), BufferedImage.TYPE_INT_RGB);
 375                 }
 376
 377                 // Clear map
 378                 Graphics g = _mapImage.getGraphics();
 379                 // Clear to white
 380                 g.setColor(COLOR_BG);
 381                 g.fillRect(0, 0, getWidth(), getHeight());
 382
 383                 // reset error message
 384                 if (!_mapCheckBox.isSelected()) {_shownOsmErrorAlready = false;}
 385                 // Only get map tiles if selected
 386                 if (_mapCheckBox.isSelected())
 387                 {
 388                         // init tile cacher
 389                         _tileCacher.centreMap(_mapPosition.getZoom(), _mapPosition.getCentreTileX(), _mapPosition.getCentreTileY());
 390
 391                         boolean loadingFailed = false;
 392                         if (_mapImage == null) return;
 393
 394                         // Loop over tiles drawing each one
 395                         int[] tileIndices = _mapPosition.getTileIndices(getWidth(), getHeight());
 396                         int[] pixelOffsets = _mapPosition.getDisplayOffsets(getWidth(), getHeight());
 397                         for (int tileX = tileIndices[0]; tileX <= tileIndices[1] && !loadingFailed; tileX++)
 398                         {
 399                                 int x = (tileX - tileIndices[0]) * 256 - pixelOffsets[0];
 400                                 for (int tileY = tileIndices[2]; tileY <= tileIndices[3]; tileY++)
 401                                 {
 402                                         int y = (tileY - tileIndices[2]) * 256 - pixelOffsets[1];
 403                                         Image image = _tileCacher.getTile(tileX, tileY);
 404                                         if (image != null) {
 405                                                 g.drawImage(image, x, y, 256, 256, null);
 406                                         }
 407                                 }
 408                         }
 409
 410                         // Make maps brighter / fainter
 411                         float[] scaleFactors = {1.0f, 1.05f, 1.1f, 1.2f, 1.6f, 2.0f};
 412                         float scaleFactor = scaleFactors[_transparencySlider.getValue()];
 413                         if (scaleFactor > 1.0f) {
 414                                 RenderingHints hints = new RenderingHints(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_OFF);
 415                                 hints.put(RenderingHints.KEY_RENDERING, RenderingHints.VALUE_RENDER_QUALITY);
 416                                 RescaleOp op = new RescaleOp(scaleFactor, 0, hints);
 417                                 op.filter(_mapImage, _mapImage);
 418                         }
 419                 }
 420
 421                 int pointsPainted = 0;
 422                 // draw track points
 423                 g.setColor(COLOR_POINT);
 424                 int prevX = -1, prevY = -1;
 425                 boolean connectPoints = _connectCheckBox.isSelected();
 426                 for (int i=0; i<_track.getNumPoints(); i++)
 427                 {
 428                         int px = getWidth() / 2 + _mapPosition.getXFromCentre(_track.getXNew(i));
 429                         int py = getHeight() / 2 + _mapPosition.getYFromCentre(_track.getYNew(i));
 430                         if (px >= 0 && px < getWidth() && py >= 0 && py < getHeight())
 431                         {
 432                                 if (!_track.getPoint(i).isWaypoint())
 433                                 {
 434                                         g.drawRect(px-2, py-2, 3, 3);
 435                                         // Connect track points
 436                                         if (connectPoints && prevX != -1 && prevY != -1 && !_track.getPoint(i).getSegmentStart()) {
 437                                                 g.drawLine(prevX, prevY, px, py);
 438                                         }
 439                                         pointsPainted++;
 440                                         prevX = px; prevY = py;
 441                                 }
 442                         }
 443                         else {
 444                                 prevX = -1; prevY = -1;
 445                         }
 446                 }
 447
 448                 // Loop over points, just drawing blobs for waypoints
 449                 g.setColor(COLOR_WAYPT_NAME);
 450                 FontMetrics fm = g.getFontMetrics();
 451                 int nameHeight = fm.getHeight();
 452                 int width = getWidth();
 453                 int height = getHeight();
 454                 for (int i=0; i<_track.getNumPoints(); i++)
 455                 {
 456                         if (_track.getPoint(i).isWaypoint())
 457                         {
 458                                 int px = getWidth() / 2 + _mapPosition.getXFromCentre(_track.getXNew(i));
 459                                 int py = getHeight() / 2 + _mapPosition.getYFromCentre(_track.getYNew(i));
 460                                 if (px >= 0 && px < getWidth() && py >= 0 && py < getHeight())
 461                                 {
 462                                         g.fillRect(px-3, py-3, 6, 6);
 463                                         pointsPainted++;
 464                                 }
 465                         }
 466                 }
 467                 // Loop over points again, now draw names for waypoints
 468                 for (int i=0; i<_track.getNumPoints(); i++)
 469                 {
 470                         if (_track.getPoint(i).isWaypoint())
 471                         {
 472                                 int px = getWidth() / 2 + _mapPosition.getXFromCentre(_track.getXNew(i));
 473                                 int py = getHeight() / 2 + _mapPosition.getYFromCentre(_track.getYNew(i));
 474                                 if (px >= 0 && px < getWidth() && py >= 0 && py < getHeight())
 475                                 {
 476                                         // Figure out where to draw waypoint name so it doesn't obscure track
 477                                         String waypointName = _track.getPoint(i).getWaypointName();
 478                                         int nameWidth = fm.stringWidth(waypointName);
 479                                         boolean drawnName = false;
 480                                         // Make arrays for coordinates right left up down
 481                                         int[] nameXs = {px + 2, px - nameWidth - 2, px - nameWidth/2, px - nameWidth/2};
 482                                         int[] nameYs = {py + (nameHeight/2), py + (nameHeight/2), py - 2, py + nameHeight + 2};
 483                                         for (int extraSpace = 4; extraSpace < 13 && !drawnName; extraSpace+=2)
 484                                         {
 485                                                 // Shift arrays for coordinates right left up down
 486                                                 nameXs[0] += 2; nameXs[1] -= 2;
 487                                                 nameYs[2] -= 2; nameYs[3] += 2;
 488                                                 // Check each direction in turn right left up down
 489                                                 for (int a=0; a<4; a++)
 490                                                 {
 491                                                         if (nameXs[a] > 0 && (nameXs[a] + nameWidth) < width
 492                                                                 && nameYs[a] < height && (nameYs[a] - nameHeight) > 0
 493                                                                 && !overlapsPoints(nameXs[a], nameYs[a], nameWidth, nameHeight))
 494                                                         {
 495                                                                 // Found a rectangle to fit - draw name here and quit
 496                                                                 g.drawString(waypointName, nameXs[a], nameYs[a]);
 497                                                                 drawnName = true;
 498                                                                 break;
 499                                                         }
 500                                                 }
 501                                         }
 502                                 }
 503                         }
 504                 }
 505                 // Loop over points, drawing blobs for photo points
 506                 g.setColor(COLOR_PHOTO_PT);
 507                 for (int i=0; i<_track.getNumPoints(); i++)
 508                 {
 509                         if (_track.getPoint(i).getPhoto() != null)
 510                         {
 511                                 int px = getWidth() / 2 + _mapPosition.getXFromCentre(_track.getXNew(i));
 512                                 int py = getHeight() / 2 + _mapPosition.getYFromCentre(_track.getYNew(i));
 513                                 if (px >= 0 && px < getWidth() && py >= 0 && py < getHeight())
 514                                 {
 515                                         g.drawRect(px-1, py-1, 2, 2);
 516                                         g.drawRect(px-2, py-2, 4, 4);
 517                                         pointsPainted++;
 518                                 }
 519                         }
 520                 }
 521
 522                 // Draw selected range
 523                 if (_selection.hasRangeSelected())
 524                 {
 525                         g.setColor(COLOR_CURR_RANGE);
 526                         for (int i=_selection.getStart(); i<=_selection.getEnd(); i++)
 527                         {
 528                                 int px = getWidth() / 2 + _mapPosition.getXFromCentre(_track.getXNew(i));
 529                                 int py = getHeight() / 2 + _mapPosition.getYFromCentre(_track.getYNew(i));
 530                                 g.drawRect(px-1, py-1, 2, 2);
 531                         }
 532                 }
 533
 534                 // Draw selected point, crosshairs
 535                 int selectedPoint = _selection.getCurrentPointIndex();
 536                 if (selectedPoint >= 0)
 537                 {
 538                         int px = getWidth() / 2 + _mapPosition.getXFromCentre(_track.getXNew(selectedPoint));
 539                         int py = getHeight() / 2 + _mapPosition.getYFromCentre(_track.getYNew(selectedPoint));
 540                         g.setColor(COLOR_CROSSHAIRS);
 541                         // crosshairs
 542                         g.drawLine(px, 0, px, getHeight());
 543                         g.drawLine(0, py, getWidth(), py);
 544                         // oval
 545                         g.drawOval(px - 2, py - 2, 4, 4);
 546                         g.drawOval(px - 3, py - 3, 6, 6);
 547                 }
 548
 549                 // free g
 550                 g.dispose();
 551
 552                 _recalculate = false;
 553                 // Zoom to fit if no points found
 554                 if (pointsPainted <= 0 && _checkBounds) {
 555                         zoomToFit();
 556                         _recalculate = true;
 557                         repaint();
 558                 }
 559                 _checkBounds = false;
 560                 // enable / disable transparency slider
 561                 _transparencySlider.setEnabled(_mapCheckBox.isSelected());
 562         }
 563
 564
 565         /**
 566          * Tests whether there are any dark pixels within the specified x,y rectangle
 567          * @param inX left X coordinate
 568          * @param inY bottom Y coordinate
 569          * @param inWidth width of rectangle
 570          * @param inHeight height of rectangle
 571          * @return true if there's at least one data point in the rectangle
 572          */
 573         private boolean overlapsPoints(int inX, int inY, int inWidth, int inHeight)
 574         {
 575                 // each of the colour channels must be brighter than this to count as empty
 576                 final int BRIGHTNESS_LIMIT = 210;
 577                 try
 578                 {
 579                         // loop over x coordinate of rectangle
 580                         for (int x=0; x<inWidth; x++)
 581                         {
 582                                 // loop over y coordinate of rectangle
 583                                 for (int y=0; y<inHeight; y++)
 584                                 {
 585                                         int pixelColor = _mapImage.getRGB(inX + x, inY - y);
 586                                         // split into four components rgba
 587                                         int lowestBit = pixelColor & 255;
 588                                         int secondBit = (pixelColor >> 8) & 255;
 589                                         int thirdBit = (pixelColor >> 16) & 255;
 590                                         //int fourthBit = (pixelColor >> 24) & 255; // alpha ignored
 591                                         if (lowestBit < BRIGHTNESS_LIMIT || secondBit < BRIGHTNESS_LIMIT || thirdBit < BRIGHTNESS_LIMIT) return true;
 592                                 }
 593                         }
 594                 }
 595                 catch (NullPointerException e) {
 596                         // ignore null pointers, just return false
 597                 }
 598                 return false;
 599         }
 600
 601
 602         /**
 603          * Inform that tiles have been updated and the map can be repainted
 604          * @param isOK true if data loaded ok, false for error
 605          */
 606         public synchronized void tilesUpdated(boolean inIsOk)
 607         {
 608                 // Show message if loading failed (but not too many times)
 609                 if (!inIsOk && !_shownOsmErrorAlready)
 610                 {
 611                         _shownOsmErrorAlready = true;
 612                         // use separate thread to show message about failing to load osm images
 613                         new Thread(new Runnable() {
 614                                 public void run() {
 615                                         try {Thread.sleep(500);} catch (InterruptedException ie) {}
 616                                         JOptionPane.showMessageDialog(MapCanvas.this,
 617                                                 I18nManager.getText("error.osmimage.failed"),
 618                                                 I18nManager.getText("error.osmimage.dialogtitle"),
 619                                                 JOptionPane.ERROR_MESSAGE);
 620                                 }
 621                         }).start();
 622                 }
 623                 _recalculate = true;
 624                 repaint();
 625         }
 626
 627         /**
 628          * Zoom out, if not already at minimum zoom
 629          */
 630         public void zoomOut()
 631         {
 632                 _mapPosition.zoomOut();
 633                 _recalculate = true;
 634                 repaint();
 635         }
 636
 637         /**
 638          * Zoom in, if not already at maximum zoom
 639          */
 640         public void zoomIn()
 641         {
 642                 _mapPosition.zoomIn();
 643                 _recalculate = true;
 644                 repaint();
 645         }
 646
 647         /**
 648          * Pan map
 649          * @param inDeltaX x shift
 650          * @param inDeltaY y shift
 651          */
 652         public void panMap(int inDeltaX, int inDeltaY)
 653         {
 654                 _mapPosition.pan(inDeltaX, inDeltaY);
 655                 _recalculate = true;
 656                 repaint();
 657         }
 658
 659         /**
 660          * @see javax.swing.JComponent#getMinimumSize()
 661          */
 662         public Dimension getMinimumSize()
 663         {
 664                 final Dimension minSize = new Dimension(512, 300);
 665                 return minSize;
 666         }
 667
 668         /**
 669          * @see javax.swing.JComponent#getPreferredSize()
 670          */
 671         public Dimension getPreferredSize()
 672         {
 673                 return getMinimumSize();
 674         }
 675
 676
 677         /**
 678          * Respond to mouse click events
 679          * @see java.awt.event.MouseListener#mouseClicked(java.awt.event.MouseEvent)
 680          */
 681         public void mouseClicked(MouseEvent inE)
 682         {
 683                 if (_track != null && _track.getNumPoints() > 0)
 684                 {
 685                          // select point if it's a left-click
 686                         if (!inE.isMetaDown())
 687                         {
 688                                 int pointIndex = _track.getNearestPointIndexNew(
 689                                          _mapPosition.getXFromPixels(inE.getX(), getWidth()),
 690                                          _mapPosition.getYFromPixels(inE.getY(), getHeight()),
 691                                          _mapPosition.getBoundsFromPixels(CLICK_SENSITIVITY), false);
 692                                 _selection.selectPoint(pointIndex);
 693                         }
 694                         else
 695                         {
 696                                 // show the popup menu for right-clicks
 697                                 _popupMenuX = inE.getX();
 698                                 _popupMenuY = inE.getY();
 699                                 _popup.show(this, _popupMenuX, _popupMenuY);
 700                         }
 701                 }
 702         }
 703
 704         /**
 705          * Ignore mouse enter events
 706          * @see java.awt.event.MouseListener#mouseEntered(java.awt.event.MouseEvent)
 707          */
 708         public void mouseEntered(MouseEvent inE)
 709         {
 710                 // ignore
 711         }
 712
 713         /**
 714          * Ignore mouse exited events
 715          * @see java.awt.event.MouseListener#mouseExited(java.awt.event.MouseEvent)
 716          */
 717         public void mouseExited(MouseEvent inE)
 718         {
 719                 // ignore
 720         }
 721
 722         /**
 723          * Ignore mouse pressed events
 724          * @see java.awt.event.MouseListener#mousePressed(java.awt.event.MouseEvent)
 725          */
 726         public void mousePressed(MouseEvent inE)
 727         {
 728                 // ignore
 729         }
 730
 731         /**
 732          * Respond to mouse released events
 733          * @see java.awt.event.MouseListener#mouseReleased(java.awt.event.MouseEvent)
 734          */
 735         public void mouseReleased(MouseEvent inE)
 736         {
 737                 _recalculate = true;
 738                 if (_zoomDragging && Math.abs(_dragToX - _dragFromX) > 20 && Math.abs(_dragToY - _dragFromY) > 20)
 739                 {
 740                         //System.out.println("Finished zoom: " + _dragFromX + ", " + _dragFromY + " to " + _dragToX + ", " + _dragToY);
 741                         _mapPosition.zoomToPixels(_dragFromX, _dragToX, _dragFromY, _dragToY, getWidth(), getHeight());
 742                 }
 743                 _dragFromX = _dragFromY = -1;
 744                 _zoomDragging = false;
 745                 repaint();
 746         }
 747
 748         /**
 749          * Respond to mouse drag events
 750          * @see java.awt.event.MouseMotionListener#mouseDragged(java.awt.event.MouseEvent)
 751          */
 752         public void mouseDragged(MouseEvent inE)
 753         {
 754                 if (!inE.isMetaDown())
 755                 {
 756                         // Left mouse drag - pan map by appropriate amount
 757                         _zoomDragging = false;
 758                         if (_dragFromX != -1)
 759                         {
 760                                 panMap(_dragFromX - inE.getX(), _dragFromY - inE.getY());
 761                                 _recalculate = true;
 762                                 repaint();
 763                         }
 764                         _dragFromX = inE.getX();
 765                         _dragFromY = inE.getY();
 766                 }
 767                 else
 768                 {
 769                         // Right-click and drag - draw rectangle and control zoom
 770                         _zoomDragging = true;
 771                         if (_dragFromX == -1) {
 772                                 _dragFromX = inE.getX();
 773                                 _dragFromY = inE.getY();
 774                         }
 775                         _dragToX = inE.getX();
 776                         _dragToY = inE.getY();
 777                         repaint();
 778                 }
 779         }
 780
 781         /**
 782          * Respond to mouse move events without button pressed
 783          * @param inEvent ignored
 784          */
 785         public void mouseMoved(MouseEvent inEvent)
 786         {
 787                 // ignore
 788         }
 789
 790         /**
 791          * Respond to status bar message from broker
 792          * @param inMessage message, ignored
 793          */
 794         public void actionCompleted(String inMessage)
 795         {
 796                 // ignore
 797         }
 798
 799         /**
 800          * Respond to data updated message from broker
 801          * @param inUpdateType type of update
 802          */
 803         public void dataUpdated(byte inUpdateType)
 804         {
 805                 _recalculate = true;
 806                 if ((inUpdateType & DataSubscriber.DATA_ADDED_OR_REMOVED) > 0) {
 807                         _checkBounds = true;
 808                 }
 809                 repaint();
 810                 // enable or disable components
 811                 boolean hasData = _track.getNumPoints() > 0;
 812                 _topPanel.setVisible(hasData);
 813                 _sidePanel.setVisible(hasData);
 814                 // grab focus for the key presses
 815                 this.requestFocus();
 816         }
 817
 818         /**
 819          * Respond to key presses on the map canvas
 820          * @param inE key event
 821          */
 822         public void keyPressed(KeyEvent inE)
 823         {
 824                 int code = inE.getKeyCode();
 825                 // Check for meta key
 826                 if (inE.isControlDown())
 827                 {
 828                         // Check for arrow keys to zoom in and out
 829                         if (code == KeyEvent.VK_UP)
 830                                 zoomIn();
 831                         else if (code == KeyEvent.VK_DOWN)
 832                                 zoomOut();
 833                         // Key nav for next/prev point
 834                         else if (code == KeyEvent.VK_LEFT)
 835                                 _selection.selectPreviousPoint();
 836                         else if (code == KeyEvent.VK_RIGHT)
 837                                 _selection.selectNextPoint();
 838                 }
 839                 else
 840                 {
 841                         // Check for arrow keys to pan
 842                         int upwardsPan = 0;
 843                         if (code == KeyEvent.VK_UP)
 844                                 upwardsPan = -PAN_DISTANCE;
 845                         else if (code == KeyEvent.VK_DOWN)
 846                                 upwardsPan = PAN_DISTANCE;
 847                         int rightwardsPan = 0;
 848                         if (code == KeyEvent.VK_RIGHT)
 849                                 rightwardsPan = PAN_DISTANCE;
 850                         else if (code == KeyEvent.VK_LEFT)
 851                                 rightwardsPan = -PAN_DISTANCE;
 852                         panMap(rightwardsPan, upwardsPan);
 853                         // Check for delete key to delete current point
 854                         if (code == KeyEvent.VK_DELETE && _selection.getCurrentPointIndex() >= 0)
 855                         {
 856                                 _app.deleteCurrentPoint();
 857                         }
 858                 }
 859         }
 860
 861         /**
 862          * @param inE key released event, ignored
 863          */
 864         public void keyReleased(KeyEvent e)
 865         {
 866                 // ignore
 867         }
 868
 869         /**
 870          * @param inE key typed event, ignored
 871          */
 872         public void keyTyped(KeyEvent inE)
 873         {
 874                 // ignore
 875         }
 876
 877         /**
 878          * @param inE mouse wheel event indicating scroll direction
 879          */
 880         public void mouseWheelMoved(MouseWheelEvent inE)
 881         {
 882                 int clicks = inE.getWheelRotation();
 883                 if (clicks < 0)
 884                         zoomIn();
 885                 else if (clicks > 0)
 886                         zoomOut();
 887         }
 888 }