net/systemeD/halcyon/Map.as

   1 package net.systemeD.halcyon {
   2
   3         import flash.display.Loader;
   4         import flash.display.Sprite;
   5         import flash.events.*;
   6         import flash.external.ExternalInterface;
   7         import flash.geom.Rectangle;
   8         import flash.net.*;
   9         import flash.text.Font;
  10         import flash.text.TextField;
  11         import flash.ui.Keyboard;
  12
  13         import net.systemeD.halcyon.connection.*;
  14         import net.systemeD.halcyon.styleparser.*;
  15
  16 //      for experimental export function:
  17 //      import flash.net.FileReference;
  18 //      import com.adobe.images.JPGEncoder;
  19
  20     /** The representation of part of the map on the screen, including information about coordinates, background imagery, paint properties etc. */
  21     public class Map extends Sprite {
  22
  23                 /** master map scale - how many Flash pixels in 1 degree longitude (for Landsat, 5120) */
  24                 public const MASTERSCALE:Number=5825.4222222222;
  25
  26                 /** don't zoom out past this */
  27                 public const MINSCALE:uint=13;
  28                 /** don't zoom in past this */
  29                 public const MAXSCALE:uint=23;
  30
  31                 // Container for MapPaint objects
  32                 public var paintContainer:Sprite;
  33
  34                 /** map scale */
  35                 public var scale:uint=14;
  36                 /** current scaling factor for lon/latp */
  37                 public var scalefactor:Number=MASTERSCALE;
  38
  39                 public var edge_l:Number;                                               // current bounding box
  40                 public var edge_r:Number;                                               //  |
  41                 public var edge_t:Number;                                               //  |
  42                 public var edge_b:Number;                                               //  |
  43                 public var centre_lat:Number;                                   // centre lat/lon
  44                 public var centre_lon:Number;                                   //  |
  45
  46                 /** urllon-xradius/masterscale; */
  47                 public var baselon:Number;
  48                 /** lat2lat2p(urllat)+yradius/masterscale; */
  49                 public var basey:Number;
  50                 /** width (Flash pixels) */
  51                 public var mapwidth:uint;
  52                 /** height (Flash pixels) */
  53                 public var mapheight:uint;
  54
  55                 /** Is the map being panned */
  56                 public var dragstate:uint=NOT_DRAGGING;                 // dragging map (panning)
  57                 /** Can the map be panned */
  58                 private var _draggable:Boolean=true;                    //  |
  59                 private var lastxmouse:Number;                                  //  |
  60                 private var lastymouse:Number;                                  //  |
  61                 private var downX:Number;                                               //  |
  62                 private var downY:Number;                                               //  |
  63                 private var downTime:Number;                                    //  |
  64                 public const NOT_DRAGGING:uint=0;                               //  |
  65                 public const NOT_MOVED:uint=1;                                  //  |
  66                 public const DRAGGING:uint=2;                                   //  |
  67                 /** How far the map can be dragged without actually triggering a pan. */
  68                 public const TOLERANCE:uint=7;                                  //  |
  69
  70                 /** object containing HTML page parameters: lat, lon, zoom, background_dim, background_sharpen, tileblocks */
  71                 public var initparams:Object;
  72
  73                 /** reference to backdrop sprite */
  74                 public var backdrop:Object;
  75                 /** background tile object */
  76                 public var tileset:TileSet;
  77                 /** background tile URL, name and scheme */
  78                 public var tileparams:Object={ url:'' };
  79                 /** show all objects, even if unstyled? */
  80                 public var showall:Boolean=true;
  81
  82                 // ------------------------------------------------------------------------------------------
  83                 /** Map constructor function */
  84         public function Map() {
  85                         // Remove any existing sprites
  86                         while (numChildren) { removeChildAt(0); }
  87
  88                         // 900913 background
  89                         tileset=new TileSet(this);
  90                         addChild(tileset);
  91
  92                         // Container for all MapPaint objects
  93                         paintContainer = new Sprite();
  94                         addChild(paintContainer);
  95
  96                         addEventListener(Event.ENTER_FRAME, everyFrame);
  97                         scrollRect=new Rectangle(0,0,800,600);
  98
  99                         if (ExternalInterface.available) {
 100                                 ExternalInterface.addCallback("setPosition", function (lat:Number,lon:Number,zoom:uint):void {
 101                                         updateCoordsFromLatLon(lat, lon);
 102                                         changeScale(zoom);
 103                                 });
 104                         }
 105                 }
 106
 107                 // ------------------------------------------------------------------------------------------
 108                 /** Initialise map at a given lat/lon */
 109         public function init(startlat:Number, startlon:Number, startscale:uint=0):void {
 110                         if (startscale>0) {
 111                                 scale=startscale;
 112                                 this.dispatchEvent(new MapEvent(MapEvent.SCALE, {scale:scale}));
 113                         }
 114                         scalefactor=MASTERSCALE/Math.pow(2,13-scale);
 115                         baselon    =startlon          -(mapwidth /2)/scalefactor;
 116                         basey      =lat2latp(startlat)+(mapheight/2)/scalefactor;
 117                         updateCoords(0,0);
 118             this.dispatchEvent(new Event(MapEvent.INITIALISED));
 119                         download();
 120         }
 121
 122                 // ------------------------------------------------------------------------------------------
 123                 /** Recalculate co-ordinates from new Flash origin */
 124
 125                 public function updateCoords(tx:Number,ty:Number):void {
 126                         setScrollRectXY(tx,ty);
 127
 128                         edge_t=coord2lat(-ty          );
 129                         edge_b=coord2lat(-ty+mapheight);
 130                         edge_l=coord2lon(-tx          );
 131                         edge_r=coord2lon(-tx+mapwidth );
 132                         setCentre();
 133
 134                         tileset.update();
 135                 }
 136
 137                 /** Move the map to centre on a given latitude/longitude. */
 138                 public function updateCoordsFromLatLon(lat:Number,lon:Number):void {
 139                         var cy:Number=-(lat2coord(lat)-mapheight/2);
 140                         var cx:Number=-(lon2coord(lon)-mapwidth/2);
 141                         updateCoords(cx,cy);
 142                 }
 143
 144                 private function setScrollRectXY(tx:Number,ty:Number):void {
 145                         var w:Number=scrollRect.width;
 146                         var h:Number=scrollRect.height;
 147                         scrollRect=new Rectangle(-tx,-ty,w,h);
 148                 }
 149                 private function setScrollRectSize(width:Number,height:Number):void {
 150                         var sx:Number=scrollRect.x ? scrollRect.x : 0;
 151                         var sy:Number=scrollRect.y ? scrollRect.y : 0;
 152                         scrollRect=new Rectangle(sx,sy,width,height);
 153                 }
 154
 155                 private function getX():Number { return -scrollRect.x; }
 156                 private function getY():Number { return -scrollRect.y; }
 157
 158                 private function setCentre():void {
 159                         centre_lat=coord2lat(-getY()+mapheight/2);
 160                         centre_lon=coord2lon(-getX()+mapwidth/2);
 161                         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}));
 162                 }
 163
 164                 /** Sets the offset between the background imagery and the map. */
 165                 public function nudgeBackground(x:Number,y:Number):void {
 166                         this.dispatchEvent(new MapEvent(MapEvent.NUDGE_BACKGROUND, { x: x, y: y }));
 167                 }
 168
 169                 private function moveMap(dx:Number,dy:Number):void {
 170                         updateCoords(getX()+dx,getY()+dy);
 171                         updateAllEntityUIs(false, false);
 172                         download();
 173                 }
 174
 175                 /** Recentre map at given lat/lon, updating the UI and downloading entities. */
 176                 public function moveMapFromLatLon(lat:Number,lon:Number):void {
 177                         updateCoordsFromLatLon(lat,lon);
 178                         updateAllEntityUIs(false,false);
 179                         download();
 180                 }
 181
 182                 /** Recentre map at given lat/lon, if that point is currently outside the visible area. */
 183                 public function scrollIfNeeded(lat:Number,lon:Number): void{
 184             if (lat> edge_t || lat < edge_b || lon < edge_l || lon > edge_r) {
 185                 moveMapFromLatLon(lat, lon);
 186             }
 187                 }
 188
 189                 // Co-ordinate conversion functions
 190
 191                 public function latp2coord(a:Number):Number     { return -(a-basey)*scalefactor; }
 192                 public function coord2latp(a:Number):Number     { return a/-scalefactor+basey; }
 193                 public function lon2coord(a:Number):Number      { return (a-baselon)*scalefactor; }
 194                 public function coord2lon(a:Number):Number      { return a/scalefactor+baselon; }
 195
 196                 public function latp2lat(a:Number):Number       { return 180/Math.PI * (2 * Math.atan(Math.exp(a*Math.PI/180)) - Math.PI/2); }
 197                 public function lat2latp(a:Number):Number       { return 180/Math.PI * Math.log(Math.tan(Math.PI/4+a*(Math.PI/180)/2)); }
 198
 199                 public function lat2coord(a:Number):Number      { return -(lat2latp(a)-basey)*scalefactor; }
 200                 public function coord2lat(a:Number):Number      { return latp2lat(a/-scalefactor+basey); }
 201
 202
 203                 // ------------------------------------------------------------------------------------------
 204                 /** Resize map size based on current stage and height */
 205
 206                 public function updateSize(w:uint, h:uint):void {
 207                         mapwidth = w; centre_lon=coord2lon(-getX()+w/2);
 208                         mapheight= h; centre_lat=coord2lat(-getY()+h/2);
 209                         setScrollRectSize(w,h);
 210
 211                         this.dispatchEvent(new MapEvent(MapEvent.RESIZE, {width:w, height:h}));
 212
 213             if ( backdrop != null ) {
 214                 backdrop.width=mapwidth;
 215                 backdrop.height=mapheight;
 216             }
 217             if ( mask != null ) {
 218                 mask.width=mapwidth;
 219                 mask.height=mapheight;
 220             }
 221                 }
 222
 223         /** Download map data. Data is downloaded for the connection and the vector layers, where supported.
 224         * The bounding box for the download is taken from the current map edges.
 225         */
 226                 public function download():void {
 227 trace("download "+edge_l+","+edge_r+","+edge_t+","+edge_b)
 228                         this.dispatchEvent(new MapEvent(MapEvent.DOWNLOAD, {minlon:edge_l, maxlon:edge_r, maxlat:edge_t, minlat:edge_b} ));
 229                         for (var i:uint=0; i<paintContainer.numChildren; i++)
 230                                 getLayerAt(i).connection.loadBbox(edge_l,edge_r,edge_t,edge_b);
 231                 }
 232
 233         // Handle mouse events on ways/nodes
 234         private var mapController:MapController = null;
 235
 236         /** Assign map controller. */
 237         public function setController(controller:MapController):void {
 238             this.mapController = controller;
 239         }
 240
 241         public function entityMouseEvent(event:MouseEvent, entity:Entity):void {
 242             if ( mapController != null )
 243                 mapController.entityMouseEvent(event, entity);
 244         }
 245
 246                 // ------------------------------------------------------------------------------------------
 247                 // Add layers
 248
 249                 public function addLayer(connection:Connection, styleurl:String, backgroundlayer:Boolean=true):void {
 250                         var paint:MapPaint=new MapPaint(this, connection, styleurl, -5, 5);
 251                         paintContainer.addChild(paint);
 252                         paint.isBackground=backgroundlayer;
 253                 }
 254
 255                 public function removeLayerByName(name:String):void {
 256                         for (var i:uint=0; i<paintContainer.numChildren; i++) {
 257                                 if (getLayerAt(i).connection.name==name)
 258                                         paintContainer.removeChildAt(i);
 259                                         // >>>> REFACTOR: needs to do the equivalent of VectorLayer.blank()
 260                         }
 261                 }
 262
 263                 public function findLayer(name:String):MapPaint {
 264                         for (var i:uint=0; i<paintContainer.numChildren; i++)
 265                                 if (getLayerAt(i).connection.name==name) return getLayerAt(i);
 266                         return null;
 267                 }
 268
 269                 private function getLayerAt(i:uint):MapPaint {
 270                         return MapPaint(paintContainer.getChildAt(i));
 271                 }
 272
 273                 /* Find which layer is editable */
 274                 public function get editableLayer():MapPaint {
 275                         var editableLayer:MapPaint;
 276                         for (var i:uint=0; i<paintContainer.numChildren; i++) {
 277                                 if (!getLayerAt(i).isBackground) {
 278                                         if (editableLayer) trace("Multiple editable layers found");
 279                                         editableLayer=getLayerAt(i);
 280                                 }
 281                         }
 282                         return editableLayer;
 283                 }
 284
 285                 // ------------------------------------------------------------------------------------------
 286                 // Redraw all items, zoom in and out
 287
 288                 private function updateAllEntityUIs(redraw:Boolean,remove:Boolean):void {
 289                         for (var i:uint=0; i<paintContainer.numChildren; i++)
 290                                 getLayerAt(i).updateEntityUIs(redraw, remove);
 291                 }
 292                 public function redraw():void {
 293                         for (var i:uint=0; i<paintContainer.numChildren; i++)
 294                                 getLayerAt(i).redraw();
 295                 }
 296                 public function redrawPOIs():void {
 297                         for (var i:uint=0; i<paintContainer.numChildren; i++)
 298                                 getLayerAt(i).redrawPOIs();
 299                 }
 300
 301                 public function zoomIn():void {
 302                         if (scale!=MAXSCALE) changeScale(scale+1);
 303                 }
 304
 305                 public function zoomOut():void {
 306                         if (scale!=MINSCALE) changeScale(scale-1);
 307                 }
 308
 309                 private function changeScale(newscale:uint):void {
 310                         scale=newscale;
 311                         this.dispatchEvent(new MapEvent(MapEvent.SCALE, {scale:scale}));
 312                         scalefactor=MASTERSCALE/Math.pow(2,13-scale);
 313                         updateCoordsFromLatLon((edge_t+edge_b)/2,(edge_l+edge_r)/2);    // recentre
 314                         tileset.changeScale(scale);
 315                         updateAllEntityUIs(true,true);
 316                         download();
 317                 }
 318
 319                 /** Select a new background imagery. */
 320                 public function setBackground(bg:Object):void {
 321                         tileparams=bg;
 322                         if (tileset) { tileset.init(bg, bg.url!=''); }
 323                 }
 324
 325                 /** Set background dimming on/off. */
 326                 public function setDimming(dim:Boolean):void {
 327                         if (tileset) { tileset.setDimming(dim); }
 328                 }
 329
 330                 /** Return background dimming. */
 331                 public function getDimming():Boolean {
 332                         if (tileset) { return tileset.getDimming(); }
 333                         return true;
 334                 }
 335
 336                 /** Set background sharpening on/off. */
 337                 public function setSharpen(sharpen:Boolean):void {
 338                         if (tileset) { tileset.setSharpen(sharpen); }
 339                 }
 340                 /** Return background sharpening. */
 341                 public function getSharpen():Boolean {
 342                         if (tileset) { return tileset.getSharpen(); }
 343                         return false;
 344                 }
 345
 346                 // ------------------------------------------------------------------------------------------
 347                 // Export (experimental)
 348                 // ** just a bit of fun for now!
 349                 // really needs to take a bbox, and make sure that the image is correctly cropped/resized
 350                 // to that area (will probably require creating a new DisplayObject with a different origin
 351                 // and mask)
 352 /*
 353                 public function export():void {
 354                         trace("size is "+this.width+","+this.height);
 355                         var jpgSource:BitmapData = new BitmapData(800,800); // (this.width, this.height);
 356                         jpgSource.draw(this);
 357                         var jpgEncoder:JPGEncoder = new JPGEncoder(85);
 358                         var jpgStream:ByteArray = jpgEncoder.encode(jpgSource);
 359                         var fileRef:FileReference = new FileReference();
 360 //                      fileRef.save(jpgStream,'map.jpeg');
 361                 }
 362
 363 */
 364
 365                 // ==========================================================================================
 366                 // Events
 367
 368                 // ------------------------------------------------------------------------------------------
 369                 // Mouse events
 370
 371                 /** Should map be allowed to pan? */
 372                 public function set draggable(draggable:Boolean):void {
 373                         _draggable=draggable;
 374                         dragstate=NOT_DRAGGING;
 375                 }
 376
 377                 /** Prepare for being dragged by recording start time and location of mouse. */
 378                 public function mouseDownHandler(event:MouseEvent):void {
 379                         if (!_draggable) { return; }
 380                         dragstate=NOT_MOVED;
 381                         lastxmouse=stage.mouseX; downX=stage.mouseX;
 382                         lastymouse=stage.mouseY; downY=stage.mouseY;
 383                         downTime=new Date().getTime();
 384                 }
 385
 386                 /** Respond to mouse up by possibly moving map. */
 387                 public function mouseUpHandler(event:MouseEvent=null):void {
 388                         if (dragstate==DRAGGING) { moveMap(x,y); }
 389                         dragstate=NOT_DRAGGING;
 390                 }
 391
 392                 /** Respond to mouse movement, dragging the map if tolerance threshold met. */
 393                 public function mouseMoveHandler(event:MouseEvent):void {
 394                         if (!_draggable) { return; }
 395                         if (dragstate==NOT_DRAGGING) {
 396                            this.dispatchEvent(new MapEvent(MapEvent.MOUSE_MOVE, { x: coord2lon(mouseX), y: coord2lat(mouseY) }));
 397                return;
 398             }
 399
 400                         if (dragstate==NOT_MOVED) {
 401                                 if (new Date().getTime()-downTime<300) {
 402                                         if (Math.abs(downX-stage.mouseX)<=TOLERANCE   && Math.abs(downY-stage.mouseY)<=TOLERANCE  ) return;
 403                                 } else {
 404                                         if (Math.abs(downX-stage.mouseX)<=TOLERANCE/2 && Math.abs(downY-stage.mouseY)<=TOLERANCE/2) return;
 405                                 }
 406                                 dragstate=DRAGGING;
 407                         }
 408
 409                         setScrollRectXY(getX()+stage.mouseX-lastxmouse,getY()+stage.mouseY-lastymouse);
 410                         lastxmouse=stage.mouseX; lastymouse=stage.mouseY;
 411                         setCentre();
 412                 }
 413
 414                 // ------------------------------------------------------------------------------------------
 415                 // Do every frame
 416
 417                 private function everyFrame(event:Event):void {
 418                         if (tileset) { tileset.serviceQueue(); }
 419                 }
 420
 421                 // ------------------------------------------------------------------------------------------
 422                 // Miscellaneous events
 423
 424                 /** Respond to cursor movements and zoom in/out.*/
 425                 public function keyUpHandler(event:KeyboardEvent):void {
 426                         if (event.target is TextField) return;                          // not meant for us
 427                         switch (event.keyCode) {
 428                                 case Keyboard.PAGE_UP:  zoomIn(); break;                 // Page Up - zoom in
 429                                 case Keyboard.PAGE_DOWN:        zoomOut(); break;            // Page Down - zoom out
 430                                 case Keyboard.LEFT:     moveMap(mapwidth/2,0); break;        // left cursor
 431                                 case Keyboard.UP:       moveMap(0,mapheight/2); break;           // up cursor
 432                                 case Keyboard.RIGHT:    moveMap(-mapwidth/2,0); break;   // right cursor
 433                                 case Keyboard.DOWN:     moveMap(0,-mapheight/2); break;      // down cursor
 434                         }
 435                 }
 436
 437                 // ------------------------------------------------------------------------------------------
 438                 // Debugging
 439
 440                 public function clearDebug():void {
 441                         if (!Globals.vars.hasOwnProperty('debug')) return;
 442                         Globals.vars.debug.text='';
 443                 }
 444
 445                 public function addDebug(text:String):void {
 446                         trace(text);
 447                         if (!Globals.vars.hasOwnProperty('debug')) return;
 448                         if (!Globals.vars.debug.visible) return;
 449                         Globals.vars.debug.appendText(text+"\n");
 450                         Globals.vars.debug.scrollV=Globals.vars.debug.maxScrollV;
 451                 }
 452
 453         }
 454 }