Merge branch 'master' into history
[potlatch2.git] / net / systemeD / halcyon / connection / Way.as
index 6c9ae57..11d3214 100644 (file)
@@ -11,17 +11,17 @@ package net.systemeD.halcyon.connection {
                private var edge_b:Number;
                public static var entity_type:String = 'way';
 
-        public function Way(id:Number, version:uint, tags:Object, loaded:Boolean, nodes:Array, uid:Number = NaN, timestamp:String = null) {
-            super(id, version, tags, loaded, uid, timestamp);
+        public function Way(connection:Connection, id:Number, version:uint, tags:Object, loaded:Boolean, nodes:Array, uid:Number = NaN, timestamp:String = null, user:String = null) {
+            super(connection, id, version, tags, loaded, uid, timestamp, user);
             this.nodes = nodes;
                        for each (var node:Node in nodes) { node.addParent(this); }
                        calculateBbox();
         }
 
-               public function update(version:uint, tags:Object, loaded:Boolean, parentsLoaded:Boolean, nodes:Array, uid:Number = NaN, timestamp:String = null):void {
+               public function update(version:uint, tags:Object, loaded:Boolean, parentsLoaded:Boolean, nodes:Array, uid:Number = NaN, timestamp:String = null, user:String = null):void {
                        var node:Node;
                        for each (node in this.nodes) { node.removeParent(this); }
-                       updateEntityProperties(version,tags,loaded,parentsLoaded,uid,timestamp); this.nodes=nodes;
+                       updateEntityProperties(version,tags,loaded,parentsLoaded,uid,timestamp,user); this.nodes=nodes;
                        for each (node in nodes) { node.addParent(this); }
                        calculateBbox();
                }
@@ -51,11 +51,15 @@ package net.systemeD.halcyon.connection {
                            (edge_b>top    && edge_b>top   ) || deleted) { return false; }
                        return true;
                }
-        
+
         public function getNode(index:uint):Node {
             return nodes[index];
         }
 
+        public function getFirstNode():Node {
+            return nodes[0];
+        }
+
                public function getLastNode():Node {
                        return nodes[nodes.length-1];
                }
@@ -84,16 +88,18 @@ package net.systemeD.halcyon.connection {
         }
 
         public function insertNode(index:uint, node:Node, performAction:Function):void {
-                       performAction(new AddNodeToWayAction(this, node, nodes, index));
+                       if (index>0 && getNode(index-1)==node) return;
+                       if (index<nodes.length-1 && getNode(index)==node) return;
+                       performAction(new AddNodeToWayAction(this, node, nodes, index, false));
         }
 
         public function appendNode(node:Node, performAction:Function):uint {
-                       performAction(new AddNodeToWayAction(this, node, nodes, -1));
+                       if (node!=getLastNode()) performAction(new AddNodeToWayAction(this, node, nodes, -1));
             return nodes.length + 1;
         }
         
         public function prependNode(node:Node, performAction:Function):uint {
-                       performAction(new AddNodeToWayAction(this, node, nodes, 0));
+                       if (node!=getFirstNode()) performAction(new AddNodeToWayAction(this, node, nodes, 0));
             return nodes.length + 1;
         }
         
@@ -132,6 +138,7 @@ package net.systemeD.halcyon.connection {
             markDirty();
         }
 
+               /** Merges another way into this one, removing the other one. */
                public function mergeWith(way:Way,topos:int,frompos:int, performAction:Function):void {
                        performAction(new MergeWaysAction(this, way, topos, frompos));
                }
@@ -150,6 +157,39 @@ package net.systemeD.halcyon.connection {
             performAction(new ReverseNodesAction(this, nodes));
         }
 
+               
+               /** Is a point within this way?
+               * From http://as3.miguelmoraleda.com/2009/10/28/point-in-polygon-with-actionscript-3punto-dentro-de-un-poligono-con-actionscript-3/
+               */
+
+               public function pointWithin(lon:Number,lat:Number):Boolean {
+                       if (!isArea()) return false;
+                       
+                       var counter:uint = 0;
+                       var p1x:Number = nodes[0].lon;
+                       var p1y:Number = nodes[0].lat;
+                       var p2x:Number, p2y:Number;
+                       for (var i:uint = 1; i <= length; i++) {
+                               p2x = nodes[i % length].lon;
+                               p2y = nodes[i % length].lat;
+                               if (lat > Math.min(p1y, p2y)) {
+                                       if (lat <= Math.max(p1y, p2y)) {
+                                               if (lon <= Math.max(p1x, p2x)) {
+                                                       if (p1y != p2y) {
+                                                               var xinters:Number = (lat - p1y) * (p2x - p1x) / (p2y - p1y) + p1x;
+                                                               if (p1x == p2x || lon <= xinters) counter++;
+                                                       }
+                                               }
+                                       }
+                               }
+                               p1x = p2x;
+                               p1y = p2y;
+                       }
+                       if (counter % 2 == 0) { return false; }
+                       else { return true; }
+               }
+
         /**
          * Finds the 1st way segment which intersects the projected
          * coordinate and adds the node to that segment. If snap is
@@ -259,12 +299,76 @@ package net.systemeD.halcyon.connection {
                        return 'way';
                }
                
-               public override function isType(str:String):String {
+               public override function isType(str:String):Boolean {
                        if (str=='way') return true;
                        if (str=='line' && !isArea()) return true;
                        if (str=='area' &&  isArea()) return true;
                        return false;
                }
-    }
+               
+               /** Whether the way has a loop that joins back midway along its length */
+               public function isPShape():Boolean {
+                       return getFirstNode() != getLastNode() && (!hasOnceOnly(getFirstNode()) || !hasOnceOnly(getLastNode()) );
+               }
+               
+               /** Given a P-shaped way, return the index of midway node that one end connects back to. */
+               public function getPJunctionNodeIndex():uint {
+                       if (isPShape()) {
+                           if (hasOnceOnly(getFirstNode())) {
+                               // nodes[0] is the free end
+                               return nodes.indexOf(getLastNode());
+                           } else {
+                               // nodes[0] is in the loop
+                               return nodes.lastIndexOf(getFirstNode());
+                           }
+                       }
+                       return null;
+               }
+
+               public function intersects(left:Number,right:Number,top:Number,bottom:Number):Boolean {
+                       // simple test first: are any nodes contained?
+                       for (var i:uint=0; i<nodes.length; i++) {
+                               if (nodes[i].within(left,right,top,bottom)) return true;
+                       }
+                       // more complex test: do any segments cross?
+                       for (i=0; i<nodes.length-1; i++) {
+                               if (lineIntersectsRectangle(
+                                       nodes[i  ].lon, nodes[i  ].lat,
+                                       nodes[i+1].lon, nodes[i+1].lat,
+                                       left,right,top,bottom)) return true;
+                       }
+                       return false;
+               }
+               
+               private function lineIntersectsRectangle(x0:Number, y0:Number, x1:Number, y1:Number, l:Number, r:Number, b:Number, t:Number):Boolean {
+                       // from http://sebleedelisle.com/2009/05/super-fast-trianglerectangle-intersection-test/
+                       // note that t and b are transposed above because we're dealing with lat (top=90), not AS3 pixels (top=0)
+                       var m:Number = (y1-y0) / (x1-x0);
+                       var c:Number = y0 -(m*x0);
+                       var top_intersection:Number, bottom_intersection:Number;
+                       var toptrianglepoint:Number, bottomtrianglepoint:Number;
+
+                       if (m>0) {
+                               top_intersection = (m*l  + c);
+                               bottom_intersection = (m*r  + c);
+                       } else {
+                               top_intersection = (m*r  + c);
+                               bottom_intersection = (m*l  + c);
+                       }
+
+                       if (y0<y1) {
+                               toptrianglepoint = y0;
+                               bottomtrianglepoint = y1;
+                       } else {
+                               toptrianglepoint = y1;
+                               bottomtrianglepoint = y0;
+                       }
 
+                       var topoverlap:Number = top_intersection>toptrianglepoint ? top_intersection : toptrianglepoint;
+                       var botoverlap:Number = bottom_intersection<bottomtrianglepoint ? bottom_intersection : bottomtrianglepoint;
+                       return (topoverlap<botoverlap) && (!((botoverlap<t) || (topoverlap>b)));
+               }
+
+
+    }
 }