net/systemeD/halcyon/WayUI.as

   1 package net.systemeD.halcyon {
   2
   3         import flash.display.*;
   4         import flash.events.*;
   5         import flash.geom.Matrix;
   6         import flash.geom.Rectangle;
   7         import flash.text.TextField;
   8         import flash.text.TextFormat;
   9
  10         import net.systemeD.halcyon.connection.*;
  11         import net.systemeD.halcyon.styleparser.*;
  12     import net.systemeD.halcyon.ImageBank;
  13
  14         /** The graphical representation of a Way. */
  15         public class WayUI extends EntityUI {
  16
  17                 /** Total length of way */
  18                 public var pathlength:Number;
  19                 /** Area of the way */
  20                 public var patharea:Number;
  21                 /** X coord of the centre of the area */
  22                 public var centroid_x:Number;
  23                 /** Y coord of the centre of the area */
  24                 public var centroid_y:Number;                           //  |
  25                 /** Angle at each node */
  26                 public var heading:Array=new Array();
  27                 /** vertex to draw exclusively, or not at all (used by DragWayNode) */
  28                 public var drawExcept:Number;
  29                 /** " */
  30                 public var drawOnly:Number;
  31                 private var indexStart:uint;
  32                 private var indexEnd:uint;
  33                 public var nameformat:TextFormat;
  34                 private var recalculateDue:Boolean=false;
  35                 // Store the temporary highlight settings applied to all nodes.
  36                 private var nodehighlightsettings: Object={};
  37
  38                 private const NODESIZE:uint=6;
  39
  40                 public function WayUI(way:Way, paint:MapPaint) {
  41                         super(way,paint);
  42             entity.addEventListener(Connection.WAY_NODE_ADDED, wayNodeAdded, false, 0, true);
  43             entity.addEventListener(Connection.WAY_NODE_REMOVED, wayNodeRemoved, false, 0, true);
  44             entity.addEventListener(Connection.WAY_REORDERED, wayReordered, false, 0, true);
  45             entity.addEventListener(Connection.ENTITY_DRAGGED, wayDragged, false, 0, true);
  46             attachNodeListeners();
  47             attachRelationListeners();
  48             recalculate();
  49                         redraw();
  50                         redrawMultis();
  51                 }
  52
  53                 public function removeEventListeners():void {
  54                         removeGenericEventListeners();
  55             entity.removeEventListener(Connection.WAY_NODE_ADDED, wayNodeAdded);
  56             entity.removeEventListener(Connection.WAY_NODE_REMOVED, wayNodeRemoved);
  57             entity.removeEventListener(Connection.WAY_REORDERED, wayReordered);
  58             entity.removeEventListener(Connection.ENTITY_DRAGGED, wayDragged);
  59                         removeNodeListeners();
  60                         removeRelationListeners();
  61                 }
  62
  63                 private function attachNodeListeners():void {
  64                         var way:Way=entity as Way;
  65             for (var i:uint = 0; i < way.length; i++ ) {
  66                 way.getNode(i).addEventListener(Connection.NODE_MOVED, nodeMoved, false, 0, true);
  67             }
  68                 }
  69
  70                 private function removeNodeListeners():void {
  71                         var way:Way=entity as Way;
  72             for (var i:uint = 0; i < way.length; i++ ) {
  73                 way.getNode(i).removeEventListener(Connection.NODE_MOVED, nodeMoved);
  74             }
  75                 }
  76
  77                 private function wayNodeAdded(event:WayNodeEvent):void {
  78                     event.node.addEventListener(Connection.NODE_MOVED, nodeMoved, false, 0, true);
  79             recalculate();
  80                     redraw();
  81                         redrawMultis();
  82                 }
  83
  84                 private function wayNodeRemoved(event:WayNodeEvent):void {
  85                     if (!event.node.hasParent(event.way)) {
  86                                 event.node.removeEventListener(Connection.NODE_MOVED, nodeMoved);
  87                         }
  88                         paint.redrawEntity(event.node);
  89             recalculate();
  90                     redraw();
  91                         redrawMultis();
  92                 }
  93
  94         private function nodeMoved(event:NodeMovedEvent):void {
  95                         recalculate();
  96             redraw();
  97                         redrawMultis();
  98         }
  99         private function wayReordered(event:EntityEvent):void {
 100             redraw();
 101                         redrawMultis();
 102         }
 103                 private function wayDragged(event:EntityDraggedEvent):void {
 104                         offsetSprites(event.xDelta,event.yDelta);
 105                 }
 106
 107                 override protected function relationAdded(event:RelationMemberEvent):void {
 108                         super.relationAdded(event);
 109                         redrawMultis();
 110                 }
 111                 override protected function relationRemoved(event:RelationMemberEvent):void {
 112                         super.relationRemoved(event);
 113                         redrawMultis();
 114                 }
 115                 override protected function relationTagChanged(event:TagEvent):void {
 116                         super.relationTagChanged(event);
 117                         redrawMultis();
 118                 }
 119
 120                 /** Don't redraw until further notice. */
 121                 override public function suspendRedraw(event:EntityEvent):void {
 122                         super.suspendRedraw(event);
 123                         recalculateDue=false;
 124                 }
 125
 126                 /** Continue redrawing as normal. */
 127                 override public function resumeRedraw(event:EntityEvent):void {
 128                         suspended=false;
 129                         if (recalculateDue) { recalculate(); }
 130                         super.resumeRedraw(event);
 131                 }
 132
 133                 /** Redraw other ways that are the "outer" part of a multipolygon of which we are the "inner" */
 134                 public function redrawMultis():void {
 135                         var multis:Array=entity.findParentRelationsOfType('multipolygon','inner');
 136                         for each (var m:Relation in multis) {
 137                                 var outers:Array=m.findMembersByRole('outer');
 138                                 for each (var e:Entity in outers) {
 139                                         paint.redrawEntity(e);
 140                                 }
 141                         }
 142                 }
 143
 144         /** Mark every node in this way as highlighted, and redraw it.
 145         *
 146         * @param settings Style state that it applies to. @see EntityUI#setStateClass()
 147         *  */
 148         public function setHighlightOnNodes(settings:Object):void {
 149                         for (var i:uint = 0; i < Way(entity).length; i++) {
 150                 var node:Node = Way(entity).getNode(i);
 151                                 // Speed things up a bit by only setting the highlight if it's either:
 152                                 // a) an "un-highlight" (so we don't leave mess behind when scrolling)
 153                                 // b) currently onscreen
 154                                 // Currently this means if you highlight an object then scroll, nodes will scroll
 155                                 // into view that should be highlighted but aren't.
 156                                 if (settings.hoverway==false ||
 157                                     settings.selectedway==false ||
 158                                     node.within(paint.map.edge_l, paint.map.edge_r, paint.map.edge_t, paint.map.edge_b)) {
 159                                     paint.setHighlight(node,settings); // Triggers redraw if required
 160                                 }
 161                                 if (settings.selectedway || settings.hoverway)
 162                                         nodehighlightsettings=settings;
 163                                 else
 164                                         nodehighlightsettings={};
 165                         }
 166         }
 167
 168         // An ugly hack to allow nodes that have recently scrolled into view to get highlighted.
 169         public function updateHighlights():void {
 170                 if (nodehighlightsettings)
 171                    setHighlightOnNodes(nodehighlightsettings);
 172         }
 173
 174                 // ------------------------------------------------------------------------------------------
 175                 /** Calculate pathlength, patharea, centroid_x, centroid_y, heading[].
 176                 * ** this could be made scale-independent - would speed up redraw
 177                 */
 178                 public function recalculate():void {
 179                         if (suspended) { recalculateDue=true; return; }
 180
 181                         var lx:Number, ly:Number, sc:Number;
 182                         var node:Node, latp:Number, lon:Number;
 183                         var cx:Number=0, cy:Number=0;
 184                         var way:Way=entity as Way;
 185
 186                         pathlength=0;
 187                         patharea=0;
 188                         if (way.length==0) { return; }
 189
 190                         lx = way.getNode(way.length-1).lon;
 191                         ly = way.getNode(way.length-1).latp;
 192                         for ( var i:uint = 0; i < way.length; i++ ) {
 193                 node = way.getNode(i);
 194                 latp = node.latp;
 195                 lon  = node.lon;
 196
 197                                 // length and area
 198                                 if ( i>0 ) { pathlength += Math.sqrt( Math.pow(lon-lx,2)+Math.pow(latp-ly,2) ); }
 199                                 sc = (lx*latp-lon*ly)*paint.map.scalefactor;
 200                                 cx += (lx+lon)*sc;
 201                                 cy += (ly+latp)*sc;
 202                                 patharea += sc;
 203
 204                                 // heading
 205                                 if (i>0) { heading[i-1]=Math.atan2((lon-lx),(latp-ly)); }
 206
 207                                 lx=lon; ly=latp;
 208                         }
 209                         heading[way.length-1]=heading[way.length-2];
 210
 211                         pathlength*=paint.map.scalefactor;
 212                         patharea/=2;
 213                         if (patharea!=0 && way.isArea()) {
 214                                 centroid_x=paint.map.lon2coord(cx/patharea/6);
 215                                 centroid_y=paint.map.latp2coord(cy/patharea/6);
 216                         } else if (pathlength>0) {
 217                                 var c:Array=pointAt(0.5);
 218                                 centroid_x=c[0];
 219                                 centroid_y=c[1];
 220                         }
 221                         patharea=Math.abs(patharea);
 222                 }
 223
 224                 // ------------------------------------------------------------------------------------------
 225
 226                 /** Go through the complex process of drawing this way, including applying styles, casings, fills, fonts... */
 227                 override public function doRedraw():Boolean {
 228                         interactive=false;
 229                         removeSprites();
 230                         if (Way(entity).length==0) { return false; }
 231                         if (!paint.ready) { return false; }
 232
 233             // Copy tags object, and add states
 234             var tags:Object = entity.getTagsCopy();
 235             setStateClass('area', Way(entity).isArea());
 236             setStateClass('background', paint.isBackground);
 237             setStateClass('tiger', (entity.isUneditedTiger() && Globals.vars.highlightTiger));
 238             tags=applyStateClasses(tags);
 239                         if (entity.status) { tags['_status']=entity.status; }
 240
 241                         // Keep track of maximum stroke width for hitzone
 242                         var maxwidth:Number=4;
 243
 244                         // Create styleList if not already drawn
 245                         if (!styleList || !styleList.isValidAt(paint.map.scale)) {
 246                                 styleList=paint.ruleset.getStyles(entity, tags, paint.map.scale);
 247                         }
 248
 249                         // Which layer?
 250                         layer=styleList.layerOverride();
 251                         if (isNaN(layer)) {
 252                                 layer=0;
 253                                 if (tags['layer']) { layer=Math.min(Math.max(tags['layer'],paint.minlayer),paint.maxlayer); }
 254                         }
 255
 256                         // Do we have to draw all nodes in the way?
 257                         var hasFills:Boolean=styleList.hasFills();
 258                         if (isNaN(drawOnly) || hasFills) {
 259                                 indexStart=0; indexEnd=Way(entity).length;
 260                         } else {
 261                                 indexStart=Math.max(0,drawOnly-1);
 262                                 indexEnd  =Math.min(drawOnly+2,Way(entity).length);
 263                         }
 264
 265                         // Iterate through each subpart, drawing any styles on that layer
 266                         var drawn:Boolean;
 267                         var multis:Array=entity.findParentRelationsOfType('multipolygon','outer');
 268                         var inners:Array=[];
 269                         for each (var m:Relation in multis) {
 270                                 inners=inners.concat(m.findMembersByRole('inner',Way));
 271                         }
 272
 273                         for each (var subpart:String in styleList.subparts) {
 274                                 if (styleList.shapeStyles[subpart]) {
 275                                         var s:ShapeStyle=styleList.shapeStyles[subpart];
 276                                         var stroke:Shape, fill:Shape, casing:Shape, roadname:Sprite;
 277                                         var x0:Number=paint.map.lon2coord(Way(entity).getNode(0).lon);
 278                                         var y0:Number=paint.map.latp2coord(Way(entity).getNode(0).latp);
 279                                         interactive||=s.interactive;
 280
 281                                         // Stroke
 282                                         if (s.width)  {
 283                                                 stroke=new Shape(); addToLayer(stroke,STROKESPRITE,s.sublayer);
 284                                                 stroke.graphics.moveTo(x0,y0);
 285                                                 s.applyStrokeStyle(stroke.graphics);
 286                                                 if (s.dashes && s.dashes.length>0) {
 287                                                         var segments:Array=dashedLine(stroke.graphics,s.dashes);
 288                                                         if (s.line_style) { lineDecoration(stroke.graphics,s,segments); }
 289                                                 } else { solidLines(stroke.graphics,inners); }
 290                                                 drawn=true;
 291                                                 if (s.interactive) { maxwidth=Math.max(maxwidth,s.width); }
 292                                         }
 293
 294                                         // Fill
 295                                         if ((!isNaN(s.fill_color) || s.fill_image) && entity.findParentRelationsOfType('multipolygon','inner').length==0 && isNaN(drawExcept)) {
 296                                                 fill=new Shape(); addToLayer(fill,FILLSPRITE,s.sublayer);
 297                                                 fill.graphics.moveTo(x0,y0);
 298                                                 if (s.fill_image) {
 299                                                         fill.graphics.beginBitmapFill(ImageBank.getInstance().getAsBitmapData(s.fill_image));
 300                                                 } else {
 301                                                         s.applyFill(fill.graphics);
 302                                                 }
 303                                                 solidLines(fill.graphics,inners);
 304                                                 fill.graphics.endFill();
 305                                                 drawn=true;
 306                                         }
 307
 308                                         // Casing
 309                                         if (s.casing_width) {
 310                                                 casing=new Shape(); addToLayer(casing,CASINGSPRITE);
 311                                                 casing.graphics.moveTo(x0,y0);
 312                                                 s.applyCasingStyle(casing.graphics);
 313                                                 if (s.casing_dashes && s.casing_dashes.length>0) { dashedLine(casing.graphics,s.casing_dashes); }
 314                                                                                                                                         else { solidLines(casing.graphics,inners); }
 315                                                 drawn=true;
 316                                                 if (s.interactive) { maxwidth=Math.max(maxwidth,s.casing_width); }
 317                                         }
 318                                 }
 319
 320                                 if (styleList.textStyles[subpart] && isNaN(drawExcept)) {
 321                                         var t:TextStyle=styleList.textStyles[subpart];
 322                                         interactive||=t.interactive;
 323                                         roadname=new Sprite(); addToLayer(roadname,NAMESPRITE);
 324                                         nameformat = t.getTextFormat();
 325                                         var a:String=tags[t.text];
 326                                         if (a) {
 327                                                 if (t.font_caps) { a=a.toUpperCase(); }
 328                                                 if (t.text_center && centroid_x) {
 329                                                         t.writeNameLabel(roadname,a,centroid_x,centroid_y);
 330                                                 } else {
 331                                                         writeNameOnPath(roadname,a,t.text_offset ? t.text_offset : 0);
 332                                                 }
 333                                                 if (t.text_halo_radius>0) { roadname.filters=t.getHaloFilter(); }
 334                                         }
 335                                 }
 336
 337                                 // ** ShieldStyle to do
 338                         }
 339
 340                         // Draw icons
 341                         var r:Number;
 342                         var nodeSelected:int=stateClasses["nodeSelected"];
 343                         for (var i:uint = indexStart; i < indexEnd; i++) {
 344                 var node:Node = Way(entity).getNode(i);
 345                                 var nodeStateClasses:Object={};
 346 //                              if (i==0) { nodetags['_heading']= heading[i]; }
 347 //                                   else { nodetags['_heading']=(heading[i]+heading[i-1])/2; }
 348                                 // ** FIXME - heading isn't currently applied
 349                                 nodeStateClasses['junction']=(node.numParentWays>1);
 350                                 paint.createNodeUI(node,r,layer,nodeStateClasses);
 351                         }
 352                         if (!drawn) { return false; } // If not visible, no hitzone.
 353
 354             // create a generic "way" hitzone sprite
 355                         if (interactive && drawn) {
 356                     hitzone = new Sprite();
 357                     hitzone.graphics.lineStyle(maxwidth, 0x000000, 1, false, "normal", CapsStyle.ROUND, JointStyle.ROUND);
 358                     solidLines(hitzone.graphics,[]);
 359                     hitzone.visible = false;
 360                                 setListenSprite();
 361                         }
 362
 363                         return true;
 364                 }
 365
 366                 // ------------------------------------------------------------------------------------------
 367                 // Drawing support functions
 368
 369                 /** Draw solid polyline */
 370
 371                 public function solidLines(g:Graphics,inners:Array):void {
 372                         solidLine(g);
 373                         for each (var w:Way in inners) { solidLineOtherWay(g,w); }
 374                 }
 375
 376                 private function solidLine(g:Graphics):void {
 377                         if (indexEnd==0) { return; }
 378                         var way:Way=entity as Way;
 379
 380             var node:Node = way.getNode(indexStart);
 381                         g.moveTo(paint.map.lon2coord(node.lon), paint.map.latp2coord(node.latp));
 382                         for (var i:uint = indexStart+1; i < indexEnd; i++) {
 383                 node = way.getNode(i);
 384                                 if (!isNaN(drawExcept) && (i-1==drawExcept || i==drawExcept)) {
 385                                         g.moveTo(paint.map.lon2coord(node.lon), paint.map.latp2coord(node.latp));
 386                                 } else {
 387                                         g.lineTo(paint.map.lon2coord(node.lon), paint.map.latp2coord(node.latp));
 388                                 }
 389                         }
 390                 }
 391
 392                 private function solidLineOtherWay(g:Graphics,way:Way):void {
 393                         if (way.length==0) { return; }
 394
 395                         var node:Node = way.getNode(0);
 396                         g.moveTo(paint.map.lon2coord(node.lon), paint.map.latp2coord(node.latp));
 397                         for (var i:uint = 1; i < way.length; i++) {
 398                                 node = way.getNode(i);
 399                                 g.lineTo(paint.map.lon2coord(node.lon), paint.map.latp2coord(node.latp));
 400                         }
 401                 }
 402
 403                 /** Draw dashed polyline */
 404
 405                 private function dashedLine(g:Graphics,dashes:Array):Array {
 406                         var way:Way=entity as Way;
 407                         var segments:Array=[]; // array of dash locations being constructed for later arrow drawing
 408                         var draw:Boolean=false; // are we drawing or marking empty space till next dash
 409                         var dashleft:Number=0; // how much of current dash is left
 410                         var dc:Array=new Array(); // copy of dashes, gets consumed then replaced
 411                         var xc:Number, yc:Number; // normalised vector coordinates of direction to next node
 412                         var curx:Number, cury:Number; // current drawing location
 413                         var dx:Number, dy:Number, segleft:Number=0; // distance remaining until next node
 414                         var i:int=indexStart; // node index
 415                         var dashstartx:int, dashstarty:int; // needed to draw reverse arrows
 416                         var dashstartxc: Number, dashstartyc: Number;
 417
 418             var node:Node = way.getNode(i);
 419             var nextNode:Node = way.getNode(i);
 420                         g.moveTo(paint.map.lon2coord(node.lon), paint.map.latp2coord(node.latp));
 421                         while (i < indexEnd-1 || segleft>0) {
 422                                 if (dashleft<=0) {      // should be ==0
 423                                     // finished drawing current dash, pop another one off the pattern, looping if necessary
 424                                         if (dc.length==0) { dc=dashes.slice(0); }
 425                                         dashleft=dc.shift();
 426                                         if (draw) { segments.push([curx,cury,xc,yc, dashstartx, dashstarty, dashstartxc, dashstartyc]); }
 427                                         draw=!draw;
 428                                         // record start of each dash, if we need to draw a reverse arrow head later
 429                                         dashstartx = curx; dashstarty = cury;
 430                                         dashstartxc = xc; dashstartyc = yc;
 431                                 }
 432                                 if (i==drawExcept || i==drawExcept+1) { draw=false; }
 433                                 if (segleft<=0) {       // should be ==0
 434                     // arrived at target node. calculate direction to next node.
 435                     node = way.getNode(i);
 436                     nextNode = way.getNode(i+1);
 437                                         curx=paint.map.lon2coord(node.lon);
 438                     dx=paint.map.lon2coord(nextNode.lon)-curx;
 439                                         cury=paint.map.latp2coord(node.latp);
 440                     dy=paint.map.latp2coord(nextNode.latp)-cury;
 441                                         segleft=Math.sqrt(dx*dx+dy*dy);
 442                                         xc = dx/segleft;
 443                                         yc = dy/segleft;
 444                                         if (i==0) {
 445                         // record start location of very first dash
 446                         dashstartx = curx; dashstarty = cury;
 447                         dashstartxc = xc; dashstartyc = yc;
 448                                         }
 449                                         i++;
 450                                 }
 451
 452                                 if (segleft<=dashleft) {
 453                                         // the path segment is shorter than the dash: draw to end of segment
 454                                         curx+=dx; cury+=dy;
 455                                         moveLine(g,curx,cury,draw);
 456                                         dashleft-=segleft; segleft=0;
 457                                 } else {
 458                                         // draw whole dash, then loop
 459                                         curx+=dashleft*xc; dx-=dashleft*xc;
 460                                         cury+=dashleft*yc; dy-=dashleft*yc;
 461                                         moveLine(g,curx,cury,draw);
 462                                         segleft-=dashleft; dashleft=0;
 463                                 }
 464                         }
 465                         return segments;
 466                 }
 467
 468                 private function moveLine(g:Graphics,x:Number,y:Number,draw:Boolean):void {
 469                         if (draw) { g.lineTo(x,y); }
 470                                  else { g.moveTo(x,y); }
 471                 }
 472
 473                 /** Draw decoration (arrows etc.) */
 474
 475                 private function lineDecoration(g:Graphics,s:ShapeStyle,segments:Array):void {
 476                         var c:int=s.color ? s.color : 0;
 477                         switch (s.line_style.toLowerCase()) {
 478
 479                                 case 'arrows':; case 'arrows-reversed':
 480                                         var w:Number=s.width*1.5;  // width of arrow
 481                                         var l:Number=s.width*2;    // length of arrow
 482                                         g.lineStyle(1,c);
 483                                         for each (var seg:Array in segments) {
 484                                                 g.beginFill(c);
 485                                                 // seg: {dashendx, dashendy, dx, dy, dashstartx, dashstarty, dashstartdx, dashstartdy}
 486                                                 // where dx is normalised x component of direction vector
 487                                                 // note that a dash can go around a corner, so the info is not redundant
 488
 489                                                 if (s.line_style.toLowerCase() == "arrows-reversed") {
 490                                 g.moveTo(seg[4]-l*seg[6], seg[5]-l*seg[7]); // note reversed arrow head
 491                                 g.lineTo(seg[4]-w*seg[7], seg[5]+w*seg[6]);
 492                                 g.lineTo(seg[4]+w*seg[7], seg[5]-w*seg[6]);
 493                                                 } else {
 494                                                         g.moveTo(seg[0]+l*seg[2], seg[1]+l*seg[3]);
 495                                 g.lineTo(seg[0]-w*seg[3], seg[1]+w*seg[2]);
 496                                 g.lineTo(seg[0]+w*seg[3], seg[1]-w*seg[2]);
 497                             }
 498                                                 g.endFill();
 499                                         }
 500                                         break;
 501                 case 'triangle':
 502                     w=s.width*10;   //triangle egde
 503                     g.lineStyle(1,c);
 504                     for each (seg in segments) {
 505                         g.beginFill(c);
 506                         var angle0:Number = -Math.atan2(seg[3], seg[2]) + Math.PI / 2; //0
 507                         var angle1:Number = -Math.atan2(seg[3], seg[2]) - Math.PI/6;       //60
 508                         g.moveTo(seg[0], seg[1]);//start 0,0
 509                         g.lineTo(seg[0] - w * Math.sin(angle0), seg[1] - w * Math.cos(angle0));
 510                         g.lineTo(seg[0] + w * Math.sin(angle1), seg[1] + w * Math.cos(angle1));
 511                         g.endFill();
 512                     }
 513                     break;
 514                                 }
 515                 }
 516
 517                 /** Find point partway (0-1) along a path
 518                   * @return (x,y,angle)
 519                   * inspired by senocular's Path.as */
 520
 521                 private function pointAt(t:Number):Array {
 522                         var way:Way=entity as Way;
 523                         var totallen:Number = t*pathlength;
 524                         var curlen:Number = 0;
 525                         var dx:Number, dy:Number, seglen:Number;
 526                         for (var i:int = 1; i < way.length; i++){
 527                                 dx=paint.map.lon2coord(way.getNode(i).lon)-paint.map.lon2coord(way.getNode(i-1).lon);
 528                                 dy=paint.map.latp2coord(way.getNode(i).latp)-paint.map.latp2coord(way.getNode(i-1).latp);
 529                                 seglen=Math.sqrt(dx*dx+dy*dy);
 530                                 if (totallen > curlen+seglen) { curlen+=seglen; continue; }
 531                                 return new Array(paint.map.lon2coord(way.getNode(i-1).lon)+(totallen-curlen)/seglen*dx,
 532                                                                  paint.map.latp2coord(way.getNode(i-1).latp)+(totallen-curlen)/seglen*dy,
 533                                                                  Math.atan2(dy,dx));
 534                         }
 535                         return new Array(0, 0, 0);
 536                 }
 537
 538                 /** Draw name along path
 539                  * based on code by Tom Carden
 540                  * */
 541
 542                 private function writeNameOnPath(s:Sprite,a:String,textOffset:Number=0):void {
 543
 544                         // make a dummy textfield so we can measure its width
 545                         var tf:TextField = new TextField();
 546                         tf.defaultTextFormat = nameformat;
 547                         tf.text = a;
 548                         tf.width = tf.textWidth+4;
 549                         tf.height = tf.textHeight+4;
 550                         if (pathlength<tf.width) { return; }    // no room for text?
 551
 552                         var t1:Number = (pathlength/2 - tf.width/2) / pathlength; var p1:Array=pointAt(t1);
 553                         var t2:Number = (pathlength/2 + tf.width/2) / pathlength; var p2:Array=pointAt(t2);
 554
 555                         var angleOffset:Number; // so we can do a 180º if we're running backwards
 556                         var offsetSign:Number;  // -1 if we're starting at t2
 557                         var tStart:Number;      // t1 or t2
 558
 559                         // make sure text doesn't run right->left or upside down
 560                         if (p1[0] < p2[0] &&
 561                                 p1[2] < Math.PI/2 &&
 562                                 p1[2] > -Math.PI/2) {
 563                                 angleOffset = 0; offsetSign = 1; tStart = t1;
 564                         } else {
 565                                 angleOffset = Math.PI; offsetSign = -1; tStart = t2;
 566                         }
 567
 568                         // make a textfield for each char, centered on the line,
 569                         // using getCharBoundaries to rotate it around its center point
 570                         var chars:Array = a.split('');
 571                         for (var i:int = 0; i < chars.length; i++) {
 572                                 var rect:Rectangle = tf.getCharBoundaries(i);
 573                                 if (rect) {
 574                                         s.addChild(rotatedLetter(chars[i],
 575                                                                                          tStart + offsetSign*(rect.left+rect.width/2)/pathlength,
 576                                                                                          rect.width, tf.height, angleOffset, textOffset));
 577                                 }
 578                         }
 579                 }
 580
 581                 private function rotatedLetter(char:String, t:Number, w:Number, h:Number, a:Number, o:Number):TextField {
 582                         var tf:TextField = new TextField();
 583             tf.mouseEnabled = false;
 584             tf.mouseWheelEnabled = false;
 585                         tf.defaultTextFormat = nameformat;
 586                         tf.embedFonts = true;
 587                         tf.text = char;
 588                         tf.width = tf.textWidth+4;
 589                         tf.height = tf.textHeight+4;
 590
 591                         var p:Array=pointAt(t);
 592                         var matrix:Matrix = new Matrix();
 593                         matrix.translate(-w/2, -h/2-o);
 594                         // ** add (say) -4 to the height to move it up by 4px
 595                         matrix.rotate(p[2]+a);
 596                         matrix.translate(p[0], p[1]);
 597                         tf.transform.matrix = matrix;
 598                         return tf;
 599                 }
 600
 601                 public function getNodeAt(x:Number, y:Number):Node {
 602                         var way:Way=entity as Way;
 603                         for (var i:uint = 0; i < way.length; i++) {
 604                 var node:Node = way.getNode(i);
 605                 var nodeX:Number = paint.map.lon2coord(node.lon);
 606                 var nodeY:Number = paint.map.latp2coord(node.latp);
 607                 if ( nodeX >= x-NODESIZE && nodeX <= x+NODESIZE &&
 608                      nodeY >= y-NODESIZE && nodeY <= y+NODESIZE )
 609                     return node;
 610             }
 611             return null;
 612                 }
 613
 614                 // ------------------------------------------------------------------------------------------
 615                 /* Interaction */
 616         // TODO: can this be sped up? Hit testing for long ways (that go off the screen) seems to be very slow. */
 617                 public function hitTest(x:Number, y:Number):Way {
 618                         if (hitzone.hitTestPoint(x,y,true)) { return entity as Way; }
 619                         return null;
 620                 }
 621         }
 622 }