net/systemeD/halcyon/connection/Way.as

   1 package net.systemeD.halcyon.connection {
   2     import flash.geom.Point;
   3         import net.systemeD.halcyon.Globals;
   4
   5     public class Way extends Entity {
   6         private var nodes:Array;
   7                 public static var entity_type:String = 'way';
   8
   9         public function Way(id:Number, version:uint, tags:Object, loaded:Boolean, nodes:Array) {
  10             super(id, version, tags, loaded);
  11             this.nodes = nodes;
  12                         for each (var node:Node in nodes) { node.addParent(this); }
  13         }
  14
  15                 public function update(version:uint, tags:Object, loaded:Boolean, nodes:Array):void {
  16                         var node:Node;
  17                         for each (node in this.nodes) { node.removeParent(this); }
  18                         updateEntityProperties(version,tags,loaded); this.nodes=nodes;
  19                         for each (node in nodes) { node.addParent(this); }
  20                 }
  21
  22         public function get length():uint {
  23             return nodes.length;
  24         }
  25
  26         public function getNode(index:uint):Node {
  27             return nodes[index];
  28         }
  29
  30                 public function getLastNode():Node {
  31                         return nodes[nodes.length-1];
  32                 }
  33
  34         public function insertNode(index:uint, node:Node):void {
  35                         node.addParent(this);
  36             nodes.splice(index, 0, node);
  37             markDirty();
  38             dispatchEvent(new WayNodeEvent(Connection.WAY_NODE_ADDED, node, this, index));
  39         }
  40
  41         public function appendNode(node:Node):uint {
  42                         node.addParent(this);
  43             nodes.push(node);
  44             markDirty();
  45             dispatchEvent(new WayNodeEvent(Connection.WAY_NODE_ADDED, node, this, nodes.length - 1));
  46             return nodes.length;
  47         }
  48
  49         public function prependNode(node:Node):uint {
  50                         node.addParent(this);
  51             nodes.unshift(node);
  52             markDirty();
  53             dispatchEvent(new WayNodeEvent(Connection.WAY_NODE_ADDED, node, this, 0));
  54             return nodes.length;
  55         }
  56
  57         public function indexOfNode(node:Node):uint {
  58             return nodes.indexOf(node);
  59         }
  60
  61                 public function removeNode(node:Node):void {
  62                         var i:int;
  63                         while ((i=nodes.indexOf(i))>-1) {
  64                                 nodes.splice(i,1);
  65                 dispatchEvent(new WayNodeEvent(Connection.WAY_NODE_REMOVED, node, this, i));
  66                         }
  67                         node.removeParent(this);
  68                         markDirty();
  69                 }
  70
  71         public function removeNodeByIndex(index:uint):void {
  72             var removed:Array=nodes.splice(index, 1);
  73                         if (nodes.indexOf(removed[0])==-1) { removed[0].removeParent(this); }
  74                         markDirty();
  75             dispatchEvent(new WayNodeEvent(Connection.WAY_NODE_REMOVED, removed[0], this, index));
  76         }
  77
  78                 public function removeAllNodes():void {
  79                         var node:Node;
  80                         while (nodes.length) {
  81                                 node=nodes.pop();
  82                                 dispatchEvent(new WayNodeEvent(Connection.WAY_NODE_REMOVED, node, this, 0));
  83                                 // ** the event mechanism calls redraw once per wayNodeRemoved, which isn't too efficient
  84                                 //    so we should probably add a 'redraw' flag to WayNodeEvent
  85                                 node.removeParent(this);
  86                         }
  87                         // ** we should send an event to delete the entire way
  88                 }
  89
  90                 public function sliceNodes(start:int,end:int):Array {
  91                         return nodes.slice(start,end);
  92                 }
  93
  94                 public function deleteNodesFrom(start:int):void {
  95                         nodes.splice(start);
  96                 }
  97
  98                 public function mergeWith(way:Way,topos:int,frompos:int):void {
  99                         var i:int;
 100                         Globals.vars.root.addDebug("way "+id+", merging with "+way.id+", adding to "+topos+" , from "+frompos);
 101
 102                         // merge relations
 103                         for each (var r:Relation in way.parentRelations) {
 104                                 // ** needs to copy roles as well
 105                                 if (r.findEntityMemberIndex(this)==-1) {
 106                                         r.appendMember(new RelationMember(this, ''));
 107                                 }
 108                         }
 109
 110                         // merge tags
 111                         var t:Object=way.getTagsHash();
 112                         for (var k:String in t) {
 113                                 if (getTag(k) && getTag(k)!=t[k]) {
 114                                         setTag(k,getTag(k)+"; "+t[k]);
 115                                         // ** send a warning about tags not matching
 116                                 } else {
 117                                         setTag(k,t[k]);
 118                                 }
 119                         }
 120
 121                         // merge nodes
 122                         if (frompos==0) { for (i=0; i<way.length;    i++) { addToEnd(topos,way.getNode(i)); } }
 123                                            else { for (i=way.length-1; i>=0; i--) { addToEnd(topos,way.getNode(i)); } }
 124
 125                         // delete way
 126
 127                 }
 128
 129                 private function addToEnd(topos:int,node:Node):void {
 130                         Globals.vars.root.addDebug("adding "+node.id+" at "+topos);
 131                         if (topos==0) {
 132                                 if (nodes[0]==node) { return; }
 133                                 prependNode(node);
 134                         } else {
 135                                 if (nodes[nodes.length-1]==node) { return; }
 136                                 appendNode(node);
 137                         }
 138                 }
 139
 140
 141
 142         /**
 143          * Finds the 1st way segment which intersects the projected
 144          * coordinate and adds the node to that segment. If snap is
 145          * specified then the node is moved to exactly bisect the
 146          * segment.
 147          */
 148         public function insertNodeAtClosestPosition(newNode:Node, isSnap:Boolean):int {
 149             var closestProportion:Number = 1;
 150             var newIndex:uint = 0;
 151             var nP:Point = new Point(newNode.lon, newNode.latp);
 152             var snapped:Point = null;
 153
 154             for ( var i:uint; i < length - 1; i++ ) {
 155                 var node1:Node = getNode(i);
 156                 var node2:Node = getNode(i+1);
 157                 var p1:Point = new Point(node1.lon, node1.latp);
 158                 var p2:Point = new Point(node2.lon, node2.latp);
 159
 160                 var directDist:Number = Point.distance(p1, p2);
 161                 var viaNewDist:Number = Point.distance(p1, nP) + Point.distance(nP, p2);
 162
 163                 var proportion:Number = Math.abs(viaNewDist/directDist - 1);
 164                 if ( proportion < closestProportion ) {
 165                     newIndex = i+1;
 166                     closestProportion = proportion;
 167                     snapped = calculateSnappedPoint(p1, p2, nP);
 168                 }
 169             }
 170
 171             // splice in new node
 172             if ( isSnap ) {
 173                 newNode.latp = snapped.y;
 174                 newNode.lon = snapped.x;
 175             }
 176             insertNode(newIndex, newNode);
 177             return newIndex;
 178         }
 179
 180         private function calculateSnappedPoint(p1:Point, p2:Point, nP:Point):Point {
 181             var w:Number = p2.x - p1.x;
 182             var h:Number = p2.y - p1.y;
 183             var u:Number = ((nP.x-p1.x) * w + (nP.y-p1.y) * h) / (w*w + h*h);
 184             return new Point(p1.x + u*w, p1.y+u*h);
 185         }
 186
 187         public override function toString():String {
 188             return "Way("+id+"@"+version+"): "+getTagList()+
 189                      " "+nodes.map(function(item:Node,index:int, arr:Array):String {return item.id.toString();}).join(",");
 190         }
 191
 192                 public function isArea():Boolean {
 193                         return (nodes[0].id==nodes[nodes.length-1].id && nodes.length>2);
 194                 }
 195
 196                 public override function remove():void {
 197                         removeFromParents();
 198                         for each (var node:Node in nodes) {
 199                                 node.removeParent(this);
 200                                 if (!node.hasParentWays) { node.remove(); }
 201                         }
 202                         nodes=[];
 203                         deleted=true;
 204             dispatchEvent(new EntityEvent(Connection.WAY_DELETED, this));
 205                 }
 206
 207                 internal override function isEmpty():Boolean {
 208                         return (deleted || (nodes.length==0));
 209                 }
 210
 211                 public override function getType():String {
 212                         return 'way';
 213                 }
 214     }
 215
 216 }