net/systemeD/halcyon/Elastic.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 flash.events.*;
  12         import net.systemeD.halcyon.styleparser.*;
  13     import net.systemeD.halcyon.connection.*;
  14
  15         public class Elastic {
  16
  17                 public var map:Map;                                                     // reference to parent map
  18                 public var sprites:Array=new Array();           // instances in display list
  19         private var _start:Point;
  20         private var _end:Point;
  21
  22                 public function Elastic(map:Map, start:Point, end:Point) {
  23                         this.map = map;
  24                         this._start = start;
  25                         this._end = end;
  26                         redraw();
  27                 }
  28
  29                 public function set start(start:Point):void {
  30                     this._start = start;
  31                     redraw();
  32                 }
  33
  34                 public function set end(end:Point):void {
  35                     this._end = end;
  36                     redraw();
  37                 }
  38
  39                 public function get start():Point {
  40                     return _start;
  41                 }
  42
  43                 public function get end():Point {
  44                     return _end;
  45                 }
  46
  47                 public function removeSprites():void {
  48                         // Remove all currently existing sprites
  49                         while (sprites.length>0) {
  50                                 var d:DisplayObject=sprites.pop(); d.parent.removeChild(d);
  51                         }
  52         }
  53
  54                 public function redraw():void {
  55                     removeSprites();
  56
  57                         // Iterate through each sublayer, drawing any styles on that layer
  58                         var p0:Point = start;
  59                         var p1:Point = end;
  60
  61                         // Create stroke object
  62                         var stroke:Shape = new Shape();
  63             stroke.graphics.lineStyle(1, 0xff0000, 1, false, "normal", CapsStyle.ROUND, JointStyle.ROUND);
  64
  65                         var l:DisplayObject=map.paint.getChildAt(map.paint.maxlayer-map.paint.minlayer);
  66                         var o:DisplayObject=Sprite(l).getChildAt(3);    // names layer
  67                         (o as Sprite).addChild(stroke);
  68                         sprites.push(stroke);
  69
  70                         dashedLine(stroke.graphics, [2,2]);
  71
  72
  73                 }
  74
  75                 // ------------------------------------------------------------------------------------------
  76                 // Drawing support functions
  77
  78                 // Draw dashed polyline
  79
  80                 private function dashedLine(g:Graphics,dashes:Array):void {
  81                         var draw:Boolean=false, dashleft:Number=0, dc:Array=new Array();
  82                         var a:Number, xc:Number, yc:Number;
  83                         var curx:Number, cury:Number;
  84                         var dx:Number, dy:Number, segleft:Number=0;
  85                         var i:int=0;
  86
  87             var p0:Point = start;
  88             var p1:Point = end;
  89                         g.moveTo(map.lon2coord(p0.x), map.latp2coord(p0.y));
  90                         while (i < 1 || segleft>0) {
  91                                 if (dashleft<=0) {      // should be ==0
  92                                         if (dc.length==0) { dc=dashes.slice(0); }
  93                                         dashleft=dc.shift();
  94                                         draw=!draw;
  95                                 }
  96                                 if (segleft<=0) {       // should be ==0
  97                                         curx=map.lon2coord(p0.x);
  98                     dx=map.lon2coord(p1.x)-curx;
  99                                         cury=map.latp2coord(p0.y);
 100                     dy=map.latp2coord(p1.y)-cury;
 101                                         a=Math.atan2(dy,dx); xc=Math.cos(a); yc=Math.sin(a);
 102                                         segleft=Math.sqrt(dx*dx+dy*dy);
 103                                         i++;
 104                                 }
 105
 106                                 if (segleft<=dashleft) {
 107                                         // the path segment is shorter than the dash
 108                                         curx+=dx; cury+=dy;
 109                                         moveLine(g,curx,cury,draw);
 110                                         dashleft-=segleft; segleft=0;
 111                                 } else {
 112                                         // the path segment is longer than the dash
 113                                         curx+=dashleft*xc; dx-=dashleft*xc;
 114                                         cury+=dashleft*yc; dy-=dashleft*yc;
 115                                         moveLine(g,curx,cury,draw);
 116                                         segleft-=dashleft; dashleft=0;
 117                                 }
 118                         }
 119                 }
 120
 121                 private function moveLine(g:Graphics,x:Number,y:Number,draw:Boolean):void {
 122                         if (draw) { g.lineTo(x,y); }
 123                                  else { g.moveTo(x,y); }
 124                 }
 125
 126         }
 127 }