net/systemeD/halcyon/Map.as

   1 package net.systemeD.halcyon {
   2
   3         import flash.text.TextField;
   4         import flash.geom.Rectangle;
   5         import flash.display.DisplayObjectContainer;
   6         import flash.display.Loader;
   7         import flash.display.Sprite;
   8         import flash.display.Shape;
   9         import flash.display.Stage;
  10         import flash.display.BitmapData;
  11         import flash.display.LoaderInfo;
  12         import flash.text.Font;
  13         import flash.utils.ByteArray;
  14         import flash.events.*;
  15         import flash.net.*;
  16     import flash.external.ExternalInterface;
  17
  18     import net.systemeD.halcyon.connection.*;
  19     import net.systemeD.halcyon.connection.EntityEvent;
  20         import net.systemeD.halcyon.styleparser.*;
  21         import net.systemeD.halcyon.Globals;
  22         import flash.ui.Keyboard;
  23
  24 //      for experimental export function:
  25 //      import flash.net.FileReference;
  26 //      import com.adobe.images.JPGEncoder;
  27
  28     /** The representation of part of the map on the screen, including information about coordinates, background imagery, paint properties etc. */
  29     public class Map extends Sprite {
  30
  31                 /** master map scale - how many Flash pixels in 1 degree longitude (for Landsat, 5120) */
  32                 public const MASTERSCALE:Number=5825.4222222222;
  33
  34                 /** don't zoom out past this */
  35                 public const MINSCALE:uint=13;
  36                 /** don't zoom in past this */
  37                 public const MAXSCALE:uint=23;
  38
  39                 /** sprite for ways and (POI/tagged) nodes in core layer */
  40                 public var paint:MapPaint;
  41                 /** sprite for vector background layers */
  42                 public var vectorbg:Sprite;
  43
  44                 /** map scale */
  45                 public var scale:uint=14;
  46                 /** current scaling factor for lon/latp */
  47                 public var scalefactor:Number=MASTERSCALE;
  48                 public var bigedge_l:Number= 999999;                    // area of largest whichways
  49                 public var bigedge_r:Number=-999999;                    //  |
  50                 public var bigedge_b:Number= 999999;                    //  |
  51                 public var bigedge_t:Number=-999999;                    //  |
  52
  53                 public var edge_l:Number;                                               // current bounding box
  54                 public var edge_r:Number;                                               //  |
  55                 public var edge_t:Number;                                               //  |
  56                 public var edge_b:Number;                                               //  |
  57                 public var centre_lat:Number;                                   // centre lat/lon
  58                 public var centre_lon:Number;                                   //  |
  59
  60                 /** urllon-xradius/masterscale; */
  61                 public var baselon:Number;
  62                 /** lat2lat2p(urllat)+yradius/masterscale; */
  63                 public var basey:Number;
  64                 /** width (Flash pixels) */
  65                 public var mapwidth:uint;
  66                 /** height (Flash pixels) */
  67                 public var mapheight:uint;
  68
  69                 /** Is the map being panned */
  70                 public var dragstate:uint=NOT_DRAGGING;                 // dragging map (panning)
  71                 /** Can the map be panned */
  72                 private var _draggable:Boolean=true;                    //  |
  73                 private var lastxmouse:Number;                                  //  |
  74                 private var lastymouse:Number;                                  //  |
  75                 private var downX:Number;                                               //  |
  76                 private var downY:Number;                                               //  |
  77                 private var downTime:Number;                                    //  |
  78                 public const NOT_DRAGGING:uint=0;                               //  |
  79                 public const NOT_MOVED:uint=1;                                  //  |
  80                 public const DRAGGING:uint=2;                                   //  |
  81                 /** How far the map can be dragged without actually triggering a pan. */
  82                 public const TOLERANCE:uint=7;                                  //  |
  83
  84                 /** object containing HTML page parameters */
  85                 public var initparams:Object;
  86
  87                 /** reference to backdrop sprite */
  88                 public var backdrop:Object;
  89                 /** background tile object */
  90                 public var tileset:TileSet;
  91                 /** background tile URL, name and scheme */
  92                 private var tileparams:Object={ url:'' };
  93                 /** internal style URL */
  94                 private var styleurl:String='';
  95                 /** show all objects, even if unstyled? */
  96                 public var showall:Boolean=true;
  97
  98                 /** server connection */
  99                 public var connection:Connection;
 100                 /** VectorLayer objects */
 101                 public var vectorlayers:Object={};
 102
 103                 // ------------------------------------------------------------------------------------------
 104                 /** Map constructor function */
 105         public function Map(initparams:Object) {
 106
 107                         this.initparams=initparams;
 108                         connection = Connection.getConnection(initparams);
 109             connection.addEventListener(Connection.NEW_WAY, newWayCreated);
 110             connection.addEventListener(Connection.NEW_POI, newPOICreated);
 111             connection.addEventListener(Connection.WAY_RENUMBERED, wayRenumbered);
 112             connection.addEventListener(Connection.NODE_RENUMBERED, nodeRenumbered);
 113                         gotEnvironment(null);
 114
 115                         addEventListener(Event.ENTER_FRAME, everyFrame);
 116                         scrollRect=new Rectangle(0,0,800,600);
 117         }
 118
 119                 public function gotEnvironment(r:Object):void {
 120                         var loader:Loader = new Loader();
 121                         loader.contentLoaderInfo.addEventListener(Event.COMPLETE, gotFont);
 122                         loader.load(new URLRequest("FontLibrary.swf"));
 123                 }
 124
 125                 public function gotFont(r:Event):void {
 126                         var FontLibrary:Class = r.target.applicationDomain.getDefinition("FontLibrary") as Class;
 127                         Font.registerFont(FontLibrary.DejaVu);
 128
 129                         if (initparams['lat'] != null) {
 130                                 // parameters sent from HTML
 131                                 init(initparams['lat'],
 132                                          initparams['lon'],
 133                                          initparams['zoom']);
 134
 135                         } else {
 136                                 // somewhere innocuous
 137                                 init(53.09465,-2.56495,17);
 138                         }
 139                 }
 140
 141                 // ------------------------------------------------------------------------------------------
 142                 /** Initialise map at a given lat/lon */
 143         public function init(startlat:Number, startlon:Number, startscale:uint=0):void {
 144                         while (numChildren) { removeChildAt(0); }
 145
 146                         tileset=new TileSet(this);                                      // 0 - 900913 background
 147                         if (initparams['tileblocks']) {                         //   | option to block dodgy tile sources
 148                                 tileset.blocks=initparams['tileblocks'];//   |
 149                         }                                                                                       //   |
 150                         addChild(tileset);                                                      //   |
 151                         tileset.init(tileparams, false,
 152                                      initparams['background_dim']    ==null ? true  : initparams['background_dim'],
 153                                      initparams['background_sharpen']==null ? false : initparams['background_sharpen']);
 154
 155                         vectorbg = new Sprite();                                        // 1 - vector background layers
 156                         addChild(vectorbg);                                                     //   |
 157
 158                         paint = new MapPaint(this,-5,5);                        // 2 - core paint object
 159                         addChild(paint);                                                        //   |
 160                         paint.isBackground=false;                                       //   |
 161
 162                         if (styleurl) {                                                         // if we've only just set up paint, then setStyle won't have created the RuleSet
 163                                 paint.ruleset=new RuleSet(MINSCALE,MAXSCALE,redraw,redrawPOIs);
 164                                 paint.ruleset.loadFromCSS(styleurl);
 165                         }
 166                         if (startscale>0) {
 167                                 scale=startscale;
 168                                 this.dispatchEvent(new MapEvent(MapEvent.SCALE, {scale:scale}));
 169                         }
 170
 171                         scalefactor=MASTERSCALE/Math.pow(2,13-scale);
 172                         baselon    =startlon          -(mapwidth /2)/scalefactor;
 173                         basey      =lat2latp(startlat)+(mapheight/2)/scalefactor;
 174                         addDebug("Baselon "+baselon+", basey "+basey);
 175                         updateCoords(0,0);
 176             this.dispatchEvent(new Event(MapEvent.INITIALISED));
 177                         download();
 178
 179             if (ExternalInterface.available) {
 180               ExternalInterface.addCallback("setPosition", function (lat:Number,lon:Number,zoom:uint):void {
 181                   updateCoordsFromLatLon(lat, lon);
 182                   changeScale(zoom);
 183               });
 184             }
 185         }
 186
 187                 // ------------------------------------------------------------------------------------------
 188                 /** Recalculate co-ordinates from new Flash origin */
 189
 190                 public function updateCoords(tx:Number,ty:Number):void {
 191                         setScrollRectXY(tx,ty);
 192
 193                         edge_t=coord2lat(-ty          );
 194                         edge_b=coord2lat(-ty+mapheight);
 195                         edge_l=coord2lon(-tx          );
 196                         edge_r=coord2lon(-tx+mapwidth );
 197                         setCentre();
 198
 199                         tileset.update();
 200                 }
 201
 202                 /** Move the map to centre on a given latitude/longitude. */
 203                 public function updateCoordsFromLatLon(lat:Number,lon:Number):void {
 204                         var cy:Number=-(lat2coord(lat)-mapheight/2);
 205                         var cx:Number=-(lon2coord(lon)-mapwidth/2);
 206                         updateCoords(cx,cy);
 207                 }
 208
 209                 private function setScrollRectXY(tx:Number,ty:Number):void {
 210                         var w:Number=scrollRect.width;
 211                         var h:Number=scrollRect.height;
 212                         scrollRect=new Rectangle(-tx,-ty,w,h);
 213                 }
 214                 private function setScrollRectSize(width:Number,height:Number):void {
 215                         var sx:Number=scrollRect.x ? scrollRect.x : 0;
 216                         var sy:Number=scrollRect.y ? scrollRect.y : 0;
 217                         scrollRect=new Rectangle(sx,sy,width,height);
 218                 }
 219
 220                 private function getX():Number { return -scrollRect.x; }
 221                 private function getY():Number { return -scrollRect.y; }
 222
 223                 private function setCentre():void {
 224                         centre_lat=coord2lat(-getY()+mapheight/2);
 225                         centre_lon=coord2lon(-getX()+mapwidth/2);
 226                         this.dispatchEvent(new MapEvent(MapEvent.MOVE, {lat:centre_lat, lon:centre_lon, scale:scale, minlon:edge_l, maxlon:edge_r, minlat:edge_b, maxlat:edge_t}));
 227                 }
 228
 229                 /** Sets the offset between the background imagery and the map. */
 230                 public function nudgeBackground(x:Number,y:Number):void {
 231                         this.dispatchEvent(new MapEvent(MapEvent.NUDGE_BACKGROUND, { x: x, y: y }));
 232                 }
 233
 234                 private function moveMap(dx:Number,dy:Number):void {
 235                         updateCoords(getX()+dx,getY()+dy);
 236                         updateEntityUIs(false, false);
 237                         download();
 238                 }
 239
 240                 /** Recentre map at given lat/lon, updating the UI and downloading entities. */
 241                 public function moveMapFromLatLon(lat:Number,lon:Number):void {
 242                         updateCoordsFromLatLon(lat,lon);
 243                         updateEntityUIs(false,false);
 244                         download();
 245                 }
 246
 247                 // Co-ordinate conversion functions
 248
 249                 public function latp2coord(a:Number):Number     { return -(a-basey)*scalefactor; }
 250                 public function coord2latp(a:Number):Number     { return a/-scalefactor+basey; }
 251                 public function lon2coord(a:Number):Number      { return (a-baselon)*scalefactor; }
 252                 public function coord2lon(a:Number):Number      { return a/scalefactor+baselon; }
 253
 254                 public function latp2lat(a:Number):Number       { return 180/Math.PI * (2 * Math.atan(Math.exp(a*Math.PI/180)) - Math.PI/2); }
 255                 public function lat2latp(a:Number):Number       { return 180/Math.PI * Math.log(Math.tan(Math.PI/4+a*(Math.PI/180)/2)); }
 256
 257                 public function lat2coord(a:Number):Number      { return -(lat2latp(a)-basey)*scalefactor; }
 258                 public function coord2lat(a:Number):Number      { return latp2lat(a/-scalefactor+basey); }
 259
 260
 261                 // ------------------------------------------------------------------------------------------
 262                 /** Resize map size based on current stage and height */
 263
 264                 public function updateSize(w:uint, h:uint):void {
 265                         mapwidth = w; centre_lon=coord2lon(-getX()+w/2);
 266                         mapheight= h; centre_lat=coord2lat(-getY()+h/2);
 267                         setScrollRectSize(w,h);
 268
 269                         this.dispatchEvent(new MapEvent(MapEvent.RESIZE, {width:w, height:h}));
 270
 271             if ( backdrop != null ) {
 272                 backdrop.width=mapwidth;
 273                 backdrop.height=mapheight;
 274             }
 275             if ( mask != null ) {
 276                 mask.width=mapwidth;
 277                 mask.height=mapheight;
 278             }
 279                 }
 280
 281         /** Download map data. Data is downloaded for the connection and the vector layers, where supported.
 282         * The bounding box for the download is taken from the current map edges.
 283         */
 284                 public function download():void {
 285                         this.dispatchEvent(new MapEvent(MapEvent.DOWNLOAD, {minlon:edge_l, maxlon:edge_r, maxlat:edge_t, minlat:edge_b} ));
 286
 287                         if (edge_l>=bigedge_l && edge_r<=bigedge_r &&
 288                                 edge_b>=bigedge_b && edge_t<=bigedge_t) { return; }     // we have already loaded this area, so ignore
 289                         bigedge_l=edge_l; bigedge_r=edge_r;
 290                         bigedge_b=edge_b; bigedge_t=edge_t;
 291                         if (connection.waycount>1000) {
 292                                 connection.purgeOutside(edge_l,edge_r,edge_t,edge_b);
 293                         }
 294                         addDebug("Calling download with "+edge_l+"-"+edge_r+", "+edge_t+"-"+edge_b);
 295                         connection.loadBbox(edge_l,edge_r,edge_t,edge_b);
 296
 297             // Do the same for vector layers
 298             for each (var layer:VectorLayer in vectorlayers) {
 299               layer.loadBbox(edge_l,edge_r,edge_t,edge_b);
 300             }
 301                 }
 302
 303         private function newWayCreated(event:EntityEvent):void {
 304             var way:Way = event.entity as Way;
 305                         if (!way.loaded || !way.within(edge_l,edge_r,edge_t,edge_b)) { return; }
 306                         paint.createWayUI(way);
 307         }
 308
 309         private function newPOICreated(event:EntityEvent):void {
 310             var node:Node = event.entity as Node;
 311                         if (!node.within(edge_l,edge_r,edge_t,edge_b)) { return; }
 312                         paint.createNodeUI(node);
 313         }
 314
 315                 private function wayRenumbered(event:EntityRenumberedEvent):void {
 316             var way:Way = event.entity as Way;
 317                         paint.renumberWayUI(way,event.oldID);
 318                 }
 319
 320                 private function nodeRenumbered(event:EntityRenumberedEvent):void {
 321             var node:Node = event.entity as Node;
 322                         paint.renumberNodeUI(node,event.oldID);
 323                 }
 324
 325         /** Visually mark an entity as highlighted. */
 326         public function setHighlight(entity:Entity, settings:Object):void {
 327                         if      ( entity is Way  && paint.wayuis[entity.id] ) { paint.wayuis[entity.id].setHighlight(settings);  }
 328                         else if ( entity is Node && paint.nodeuis[entity.id]) { paint.nodeuis[entity.id].setHighlight(settings); }
 329         }
 330
 331         public function setHighlightOnNodes(way:Way, settings:Object):void {
 332                         if (paint.wayuis[way.id]) paint.wayuis[way.id].setHighlightOnNodes(settings);
 333         }
 334
 335                 public function protectWay(way:Way):void {
 336                         if (paint.wayuis[way.id]) paint.wayuis[way.id].protectSprites();
 337                 }
 338
 339                 public function unprotectWay(way:Way):void {
 340                         if (paint.wayuis[way.id]) paint.wayuis[way.id].unprotectSprites();
 341                 }
 342
 343                 public function limitWayDrawing(way:Way,except:Number=NaN,only:Number=NaN):void {
 344                         if (!paint.wayuis[way.id]) return;
 345                         paint.wayuis[way.id].drawExcept=except;
 346                         paint.wayuis[way.id].drawOnly  =only;
 347                         paint.wayuis[way.id].redraw();
 348                 }
 349
 350                 /** Protect Entities and EntityUIs against purging. This prevents the currently selected items
 351                    from being purged even though they're off-screen. */
 352
 353                 public function setPurgable(entities:Array, purgable:Boolean):void {
 354                         for each (var entity:Entity in entities) {
 355                                 entity.locked=!purgable;
 356                                 if ( entity is Way  ) {
 357                                         var way:Way=entity as Way;
 358                                         if (paint.wayuis[way.id]) { paint.wayuis[way.id].purgable=purgable; }
 359                                         for (var i:uint=0; i<way.length; i++) {
 360                                                 var node:Node=way.getNode(i)
 361                                                 node.locked=!purgable;
 362                                                 if (paint.nodeuis[node.id]) { paint.nodeuis[node.id].purgable=purgable; }
 363                                         }
 364                                 } else if ( entity is Node && paint.nodeuis[entity.id]) {
 365                                         paint.nodeuis[entity.id].purgable=purgable;
 366                                 }
 367                         }
 368                 }
 369
 370         // Handle mouse events on ways/nodes
 371         private var mapController:MapController = null;
 372
 373         /** Assign map controller. */
 374         public function setController(controller:MapController):void {
 375             this.mapController = controller;
 376         }
 377
 378         public function entityMouseEvent(event:MouseEvent, entity:Entity):void {
 379             if ( mapController != null )
 380                 mapController.entityMouseEvent(event, entity);
 381
 382         }
 383
 384                 // ------------------------------------------------------------------------------------------
 385                 // Add vector layer
 386
 387                 public function addVectorLayer(layer:VectorLayer):void {
 388                         vectorlayers[layer.name]=layer;
 389                         vectorbg.addChild(layer.paint);
 390                 }
 391
 392                 // ------------------------------------------------------------------------------------------
 393                 // Redraw all items, zoom in and out
 394
 395                 public function updateEntityUIs(redraw:Boolean,remove:Boolean):void {
 396                         paint.updateEntityUIs(connection.getObjectsByBbox(edge_l, edge_r, edge_t, edge_b), redraw, remove);
 397                         for each (var v:VectorLayer in vectorlayers) {
 398                                 v.paint.updateEntityUIs(v.getObjectsByBbox(edge_l, edge_r, edge_t, edge_b), redraw, remove);
 399                         }
 400                 }
 401                 /** Redraw everything, including in every vector layer. */
 402                 public function redraw():void {
 403                         paint.redraw();
 404                         for each (var v:VectorLayer in vectorlayers) { v.paint.redraw(); }
 405                 }
 406                 /** Redraw POI's, including in every vector layer. */
 407                 public function redrawPOIs():void {
 408                         paint.redrawPOIs();
 409                         for each (var v:VectorLayer in vectorlayers) { v.paint.redrawPOIs(); }
 410                 }
 411
 412                 /** Increase scale. */
 413                 public function zoomIn():void {
 414                         if (scale==MAXSCALE) { return; }
 415                         changeScale(scale+1);
 416                 }
 417
 418                 /** Decrease scale. */
 419                 public function zoomOut():void {
 420                         if (scale==MINSCALE) { return; }
 421                         changeScale(scale-1);
 422                 }
 423
 424                 private function changeScale(newscale:uint):void {
 425                         addDebug("new scale "+newscale);
 426                         scale=newscale;
 427                         this.dispatchEvent(new MapEvent(MapEvent.SCALE, {scale:scale}));
 428                         scalefactor=MASTERSCALE/Math.pow(2,13-scale);
 429                         updateCoordsFromLatLon((edge_t+edge_b)/2,(edge_l+edge_r)/2);    // recentre
 430                         tileset.changeScale(scale);
 431                         updateEntityUIs(true,true);
 432                         download();
 433                 }
 434
 435                 private function reportPosition():void {
 436                         addDebug("lon "+coord2lon(mouseX)+", lat "+coord2lat(mouseY));
 437                 }
 438
 439                 /** Switch to new MapCSS. */
 440                 public function setStyle(url:String):void {
 441                         styleurl=url;
 442                         if (paint) {
 443                                 paint.ruleset=new RuleSet(MINSCALE,MAXSCALE,redraw,redrawPOIs);
 444                                 paint.ruleset.loadFromCSS(url);
 445                         }
 446         }
 447
 448                 /** Select a new background imagery. */
 449                 public function setBackground(bg:Object):void {
 450                         tileparams=bg;
 451                         if (tileset) { tileset.init(bg, bg.url!=''); }
 452                 }
 453
 454                 /** Set background dimming on/off. */
 455                 public function setDimming(dim:Boolean):void {
 456                         if (tileset) { tileset.setDimming(dim); }
 457                 }
 458
 459                 /** Return background dimming. */
 460                 public function getDimming():Boolean {
 461                         if (tileset) { return tileset.getDimming(); }
 462                         return true;
 463                 }
 464
 465                 /** Set background sharpening on/off. */
 466                 public function setSharpen(sharpen:Boolean):void {
 467                         if (tileset) { tileset.setSharpen(sharpen); }
 468                 }
 469                 /** Return background sharpening. */
 470                 public function getSharpen():Boolean {
 471                         if (tileset) { return tileset.getSharpen(); }
 472                         return false;
 473                 }
 474
 475                 // ------------------------------------------------------------------------------------------
 476                 // Export (experimental)
 477                 // ** just a bit of fun for now!
 478                 // really needs to take a bbox, and make sure that the image is correctly cropped/resized
 479                 // to that area (will probably require creating a new DisplayObject with a different origin
 480                 // and mask)
 481 /*
 482                 public function export():void {
 483                         addDebug("size is "+this.width+","+this.height);
 484                         var jpgSource:BitmapData = new BitmapData(800,800); // (this.width, this.height);
 485                         jpgSource.draw(this);
 486                         var jpgEncoder:JPGEncoder = new JPGEncoder(85);
 487                         var jpgStream:ByteArray = jpgEncoder.encode(jpgSource);
 488                         var fileRef:FileReference = new FileReference();
 489 //                      fileRef.save(jpgStream,'map.jpeg');
 490                 }
 491
 492 */
 493
 494                 // ==========================================================================================
 495                 // Events
 496
 497                 // ------------------------------------------------------------------------------------------
 498                 // Mouse events
 499
 500                 /** Should map be allowed to pan? */
 501                 public function set draggable(draggable:Boolean):void {
 502                         _draggable=draggable;
 503                         dragstate=NOT_DRAGGING;
 504                 }
 505
 506                 /** Prepare for being dragged by recording start time and location of mouse. */
 507                 public function mouseDownHandler(event:MouseEvent):void {
 508                         if (!_draggable) { return; }
 509                         dragstate=NOT_MOVED;
 510                         lastxmouse=stage.mouseX; downX=stage.mouseX;
 511                         lastymouse=stage.mouseY; downY=stage.mouseY;
 512                         downTime=new Date().getTime();
 513                 }
 514
 515                 /** Respond to mouse up by possibly moving map. */
 516                 public function mouseUpHandler(event:MouseEvent=null):void {
 517                         if (dragstate==DRAGGING) { moveMap(x,y); }
 518                         dragstate=NOT_DRAGGING;
 519                 }
 520
 521                 /** Respond to mouse movement, dragging the map if tolerance threshold met. */
 522                 public function mouseMoveHandler(event:MouseEvent):void {
 523                         if (!_draggable) { return; }
 524                         if (dragstate==NOT_DRAGGING) { return; }
 525
 526                         if (dragstate==NOT_MOVED) {
 527                                 if (new Date().getTime()-downTime<300) {
 528                                         if (Math.abs(downX-stage.mouseX)<=TOLERANCE   && Math.abs(downY-stage.mouseY)<=TOLERANCE  ) return;
 529                                 } else {
 530                                         if (Math.abs(downX-stage.mouseX)<=TOLERANCE/2 && Math.abs(downY-stage.mouseY)<=TOLERANCE/2) return;
 531                                 }
 532                                 dragstate=DRAGGING;
 533                         }
 534
 535                         setScrollRectXY(getX()+stage.mouseX-lastxmouse,getY()+stage.mouseY-lastymouse);
 536                         lastxmouse=stage.mouseX; lastymouse=stage.mouseY;
 537                         setCentre();
 538                 }
 539
 540                 // ------------------------------------------------------------------------------------------
 541                 // Do every frame
 542
 543                 private function everyFrame(event:Event):void {
 544                         if (tileset) { tileset.serviceQueue(); }
 545                 }
 546
 547                 // ------------------------------------------------------------------------------------------
 548                 // Miscellaneous events
 549
 550                 /** Respond to cursor movements and zoom in/out.*/
 551                 public function keyUpHandler(event:KeyboardEvent):void {
 552                         if (event.target is TextField) return;                          // not meant for us
 553                         switch (event.keyCode) {
 554                                 case Keyboard.PAGE_UP:  zoomIn(); break;                 // Page Up - zoom in
 555                                 case Keyboard.PAGE_DOWN:        zoomOut(); break;            // Page Down - zoom out
 556                                 case Keyboard.LEFT:     moveMap(mapwidth/2,0); break;        // left cursor
 557                                 case Keyboard.UP:       moveMap(0,mapheight/2); break;           // up cursor
 558                                 case Keyboard.RIGHT:    moveMap(-mapwidth/2,0); break;   // right cursor
 559                                 case Keyboard.DOWN:     moveMap(0,-mapheight/2); break;      // down cursor
 560 //                              case 76:        reportPosition(); break;                        // L - report lat/long
 561                         }
 562                 }
 563
 564                 /** What to do if an error with the network connection happens. */
 565                 public function connectionError(err:Object=null): void {
 566                         addDebug("got error");
 567                 }
 568
 569                 // ------------------------------------------------------------------------------------------
 570                 // Debugging
 571
 572                 public function clearDebug():void {
 573                         if (!Globals.vars.hasOwnProperty('debug')) return;
 574                         Globals.vars.debug.text='';
 575                 }
 576
 577                 public function addDebug(text:String):void {
 578                         trace(text);
 579                         if (!Globals.vars.hasOwnProperty('debug')) return;
 580                         if (!Globals.vars.debug.visible) return;
 581                         Globals.vars.debug.appendText(text+"\n");
 582                         Globals.vars.debug.scrollV=Globals.vars.debug.maxScrollV;
 583                 }
 584
 585         }
 586 }