net/systemeD/halcyon/WayUI.as

   1 package net.systemeD.halcyon {
   2
   3         import flash.display.*;
   4         import flash.geom.Matrix;
   5         import flash.geom.Point;
   6         import flash.geom.Rectangle;
   7         import flash.text.AntiAliasType;
   8         import flash.text.GridFitType;
   9         import flash.text.TextField;
  10         import flash.text.TextFormat;
  11         import net.systemeD.halcyon.styleparser.*;
  12     import net.systemeD.halcyon.connection.*;
  13
  14         public class WayUI {
  15         private var way:Way;
  16
  17                 public var pathlength:Number;                           // length of path
  18                 public var patharea:Number;                                     // area of path
  19                 public var centroid_x:Number;                           // centroid
  20                 public var centroid_y:Number;                           //  |
  21                 public var layer:int=0;                                         // map layer
  22                 public var map:Map;                                                     // reference to parent map
  23                 public var sprites:Array=new Array();           // instances in display list
  24
  25                 public static const DEFAULT_TEXTFIELD_PARAMS:Object = {
  26                         embedFonts: true,
  27                         antiAliasType: AntiAliasType.ADVANCED,
  28                         gridFitType: GridFitType.NONE
  29                 };
  30                 [Embed(source="fonts/DejaVuSans.ttf", fontFamily="DejaVu", fontWeight="normal", mimeType="application/x-font-truetype")]
  31                 public static var DejaVu:Class;
  32                 public var nameformat:TextFormat;
  33
  34
  35                 public function WayUI(way:Way, map:Map) {
  36                         this.way = way;
  37                         this.map = map;
  38             init();
  39                 }
  40
  41                 private function init():void {
  42                         recalculate();
  43                         redraw();
  44                         // updateBbox(lon, lat);
  45                         // ** various other stuff
  46                 }
  47
  48                 // ------------------------------------------------------------------------------------------
  49                 // Calculate length etc.
  50                 // ** this could be made scale-independent - would speed up redraw
  51
  52                 public function recalculate():void {
  53                         var lx:Number, ly:Number, sc:Number;
  54                         var cx:Number=0, cy:Number=0;
  55                         pathlength=0;
  56                         patharea=0;
  57
  58                         lx = way.getNode(way.length-1).lon;
  59                         ly = way.getNode(way.length-1).latp;
  60                         for ( var i:uint = 0; i < way.length; i++ ) {
  61                 var node:Node = way.getNode(i);
  62                 var latp:Number = node.latp;
  63                 var lon:Number  = node.lon;
  64                                 if ( i>0 ) { pathlength += Math.sqrt( Math.pow(lon-lx,2)+Math.pow(latp-ly,2) ); }
  65                                 sc = (lx*latp-lon*ly)*map.scalefactor;
  66                                 cx += (lx+lon)*sc;
  67                                 cy += (ly+latp)*sc;
  68                                 patharea += sc;
  69                                 lx=lon; ly=latp;
  70                         }
  71
  72                         pathlength*=map.scalefactor;
  73                         patharea/=2;
  74                         if (patharea!=0 && way.isArea()) {
  75                                 centroid_x=map.lon2coord(cx/patharea/6);
  76                                 centroid_y=map.latp2coord(cy/patharea/6);
  77                         } else if (pathlength>0) {
  78                                 var c:Array=pointAt(0.5);
  79                                 centroid_x=c[0];
  80                                 centroid_y=c[1];
  81                         }
  82                 }
  83
  84                 // ------------------------------------------------------------------------------------------
  85                 // Redraw
  86
  87                 public function redraw():void {
  88             var tags:Object = way.getTagsCopy();
  89
  90                         // remove all currently existing sprites
  91                         while (sprites.length>0) {
  92                                 var d:Sprite=sprites.pop(); d.parent.removeChild(d);
  93                         }
  94
  95                         // which layer?
  96                         layer=5;
  97                         if ( tags['layer'] )
  98                 layer=Math.min(Math.max(tags['layer']+5,-5),5)+5;
  99
 100                         // set style
 101                         var styles:Array=map.ruleset.getStyles(false, tags, map.scale);
 102                         for each (var s:* in styles) {
 103
 104                                 if (s is ShapeStyle) {
 105                                         var stroke:Sprite, fill:Sprite, roadname:Sprite, f:Graphics, g:Graphics;
 106                                         var doStroke:Boolean=false, doDashed:Boolean=false;
 107                                         var doFill:Boolean=false, fill_colour:uint, fill_opacity:Number;
 108                                         var doCasing:Boolean=false, doDashedCasing:Boolean=false;
 109
 110                                         // Set stroke style
 111                                         if (s.isStroked)  {
 112                                                 stroke=new Sprite(); addToLayer(stroke,1,s.sublayer); g=stroke.graphics;
 113                                 g.moveTo(map.lon2coord(way.getNode(0).lon), map.latp2coord(way.getNode(0).latp));
 114                                                 g.lineStyle(s.stroke_width, s.stroke_colour, s.stroke_opacity/100,
 115                                                                         false, "normal", s.stroke_linecap, s.stroke_linejoin);
 116                                         }
 117
 118                                         // Set fill and casing style
 119                                         if (s.isFilled || s.isCased) {
 120                                                 fill=new Sprite(); addToLayer(fill,0); f=fill.graphics;
 121                                 f.moveTo(map.lon2coord(way.getNode(0).lon), map.latp2coord(way.getNode(0).latp));
 122                                                 if (s.isCased)  { f.lineStyle(s.casing_width, s.casing_colour, s.casing_opacity/100,
 123                                                                                   false, "normal", s.stroke_linecap, s.stroke_linejoin); }
 124                                                 if (s.isFilled) { f.beginFill(s.fill_colour,s.fill_opacity/100); }
 125                                         }
 126
 127                                         // Draw stroke
 128                                         if (s.stroke_dashArray.length>0) { dashedLine(g,s.stroke_dashArray); }
 129                                                            else if (s.isStroked) { solidLine(g); }
 130
 131                                         // Draw fill and casing
 132                                         if (s.casing_dashArray.length>0) { dashedLine(f,s.casing_dashArray); f.lineStyle(); }
 133                                         if (s.isFilled)                                  { f.beginFill(s.fill_colour,s.fill_opacity/100);
 134                                                                                                            solidLine(f); f.endFill(); }
 135                                         else if (s.isCased && s.casing_dashArray.length==0) { solidLine(f); }
 136
 137
 138                                 } else if (s is TextStyle && s.tag && tags[s.tag]) {
 139                                         roadname=new Sprite(); addToLayer(roadname,2);
 140                                         nameformat = s.getTextFormat();
 141                                         var a:String=tags[s.tag]; if (s.font_caps) { a=a.toUpperCase(); }
 142                                         if (s.isLine) {
 143                                                 writeNameOnPath(roadname,a,s.text_offset ? s.text_offset : 0);
 144                                                 if (s.pullout_radius>0) { roadname.filters=s.getPulloutFilter(); }
 145                                         } else if (centroid_x) {
 146                                                 s.writeNameLabel(roadname,tags[s.tag],centroid_x,centroid_y);
 147                                         }
 148
 149
 150                                 } else if (s is ShieldStyle) {
 151                                         // ** to do
 152                                 }
 153                         }
 154                 }
 155
 156                 // ------------------------------------------------------------------------------------------
 157                 // Drawing support functions
 158
 159                 // Draw solid polyline
 160
 161                 private function solidLine(g:Graphics):void {
 162             var node:Node = way.getNode(0);
 163                         g.moveTo(map.lon2coord(node.lon), map.latp2coord(node.latp));
 164                         for (var i:uint = 1; i < way.length; i++) {
 165                 node = way.getNode(i);
 166                                 g.lineTo(map.lon2coord(node.lon), map.latp2coord(node.latp));
 167                         }
 168                 }
 169
 170                 // Draw dashed polyline
 171
 172                 private function dashedLine(g:Graphics,dashes:Array):void {
 173                         var draw:Boolean=false, dashleft:Number=0, dc:Array=new Array();
 174                         var a:Number, xc:Number, yc:Number;
 175                         var curx:Number, cury:Number;
 176                         var dx:Number, dy:Number, segleft:Number=0;
 177                         var i:int=0;
 178
 179             var node:Node = way.getNode(0);
 180             var nextNode:Node = way.getNode(0);
 181                         g.moveTo(map.lon2coord(node.lon), map.latp2coord(node.latp));
 182                         while (i < way.length-1 || segleft>0) {
 183                                 if (dashleft<=0) {      // should be ==0
 184                                         if (dc.length==0) { dc=dashes.slice(0); }
 185                                         dashleft=dc.shift();
 186                                         draw=!draw;
 187                                 }
 188                                 if (segleft<=0) {       // should be ==0
 189                     node = way.getNode(i);
 190                     nextNode = way.getNode(i+1);
 191                                         curx=map.lon2coord(node.lon);
 192                     dx=map.lon2coord(nextNode.lon)-curx;
 193                                         cury=map.latp2coord(node.latp);
 194                     dy=map.latp2coord(nextNode.latp)-cury;
 195                                         a=Math.atan2(dy,dx); xc=Math.cos(a); yc=Math.sin(a);
 196                                         segleft=Math.sqrt(dx*dx+dy*dy);
 197                                         i++;
 198                                 }
 199
 200                                 if (segleft<=dashleft) {
 201                                         // the path segment is shorter than the dash
 202                                         curx+=dx; cury+=dy;
 203                                         moveLine(g,curx,cury,draw);
 204                                         dashleft-=segleft; segleft=0;
 205                                 } else {
 206                                         // the path segment is longer than the dash
 207                                         curx+=dashleft*xc; dx-=dashleft*xc;
 208                                         cury+=dashleft*yc; dy-=dashleft*yc;
 209                                         moveLine(g,curx,cury,draw);
 210                                         segleft-=dashleft; dashleft=0;
 211                                 }
 212                         }
 213                 }
 214
 215                 private function moveLine(g:Graphics,x:Number,y:Number,draw:Boolean):void {
 216                         if (draw) { g.lineTo(x,y); }
 217                                  else { g.moveTo(x,y); }
 218                 }
 219
 220
 221                 // Find point partway (0-1) along a path
 222                 // returns (x,y,angle)
 223                 // inspired by senocular's Path.as
 224
 225                 private function pointAt(t:Number):Array {
 226                         var totallen:Number = t*pathlength;
 227                         var curlen:Number = 0;
 228                         var dx:Number, dy:Number, seglen:Number;
 229                         for (var i:int = 1; i < way.length; i++){
 230                                 dx=map.lon2coord(way.getNode(i).lon)-map.lon2coord(way.getNode(i-1).lon);
 231                                 dy=map.latp2coord(way.getNode(i).latp)-map.latp2coord(way.getNode(i-1).latp);
 232                                 seglen=Math.sqrt(dx*dx+dy*dy);
 233                                 if (totallen > curlen+seglen) { curlen+=seglen; continue; }
 234                                 return new Array(map.lon2coord(way.getNode(i-1).lon)+(totallen-curlen)/seglen*dx,
 235                                                                  map.latp2coord(way.getNode(i-1).latp)+(totallen-curlen)/seglen*dy,
 236                                                                  Math.atan2(dy,dx));
 237                         }
 238                         return new Array(0, 0, 0);
 239                 }
 240
 241                 // Draw name along path
 242                 // based on code by Tom Carden
 243                 // ** needs styling
 244
 245                 private function writeNameOnPath(s:Sprite,a:String,textOffset:Number=0):void {
 246
 247                         // make a dummy textfield so we can measure its width
 248                         var tf:TextField = new TextField();
 249                         tf.defaultTextFormat = nameformat;
 250                         tf.text = a;
 251                         tf.width = tf.textWidth+4;
 252                         tf.height = tf.textHeight+4;
 253                         if (pathlength<tf.width) { return; }    // no room for text?
 254
 255                         var t1:Number = (pathlength/2 - tf.width/2) / pathlength; var p1:Array=pointAt(t1);
 256                         var t2:Number = (pathlength/2 + tf.width/2) / pathlength; var p2:Array=pointAt(t2);
 257
 258                         var angleOffset:Number; // so we can do a 180º if we're running backwards
 259                         var offsetSign:Number;  // -1 if we're starting at t2
 260                         var tStart:Number;      // t1 or t2
 261
 262                         // make sure text doesn't run right->left or upside down
 263                         if (p1[0] < p2[0] &&
 264                                 p1[2] < Math.PI/2 &&
 265                                 p1[2] > -Math.PI/2) {
 266                                 angleOffset = 0; offsetSign = 1; tStart = t1;
 267                         } else {
 268                                 angleOffset = Math.PI; offsetSign = -1; tStart = t2;
 269                         }
 270
 271                         // make a textfield for each char, centered on the line,
 272                         // using getCharBoundaries to rotate it around its center point
 273                         var chars:Array = a.split('');
 274                         for (var i:int = 0; i < chars.length; i++) {
 275                                 var rect:Rectangle = tf.getCharBoundaries(i);
 276                                 if (rect) {
 277                                         s.addChild(rotatedLetter(chars[i],
 278                                                                                          tStart + offsetSign*(rect.left+rect.width/2)/pathlength,
 279                                                                                          rect.width, tf.height, angleOffset, textOffset));
 280                                 }
 281                         }
 282                 }
 283
 284                 private function rotatedLetter(char:String, t:Number, w:Number, h:Number, a:Number, o:Number):TextField {
 285                         var tf:TextField = new TextField();
 286                         tf.embedFonts = true;
 287                         tf.defaultTextFormat = nameformat;
 288                         tf.text = char;
 289                         tf.width = tf.textWidth+4;
 290                         tf.height = tf.textHeight+4;
 291
 292                         var p:Array=pointAt(t);
 293                         var matrix:Matrix = new Matrix();
 294                         matrix.translate(-w/2, -h/2-o);
 295                         // ** add (say) -4 to the height to move it up by 4px
 296                         matrix.rotate(p[2]+a);
 297                         matrix.translate(p[0], p[1]);
 298                         tf.transform.matrix = matrix;
 299                         return tf;
 300                 }
 301
 302                 // Add object (stroke/fill/roadname) to layer sprite
 303
 304                 private function addToLayer(s:Sprite,t:uint,sublayer:int=-1):void {
 305                         var l:DisplayObject=Map(map).getChildAt(layer);
 306                         var o:DisplayObject=Sprite(l).getChildAt(t);
 307                         if (sublayer!=-1) { o=Sprite(o).getChildAt(sublayer); }
 308                         Sprite(o).addChild(s);
 309                         sprites.push(s);
 310                 }
 311         }
 312 }