New plugin "Nearest" locates the nearest point on an edge to a given input coordinate. Needed for draggable routes.

DataStructures/NNGrid.h

@@ -327,7 +327,7 @@ public:
 		return true;
 	}
 
-	_Coordinate FindNearestPointOnEdge(const _Coordinate& inputCoordinate) {
+	void FindNearestNodeInGraph(const _Coordinate& inputCoordinate, _Coordinate& outputCoordinate) {
 	    unsigned fileIndex = GetFileIndexForLatLon(100000*(lat2y(static_cast<double>(inputCoordinate.lat)/100000.)), inputCoordinate.lon);
 		std::vector<_Edge> candidates;
 		double timestamp = get_timestamp();
@@ -336,7 +336,7 @@ public:
 				GetContentsOfFileBucket(fileIndex+i+j, candidates);
 			}
 		}
-		_Coordinate nearest(numeric_limits<int>::max(), numeric_limits<int>::max()), tmp;
+		_Coordinate tmp;
 		double dist = numeric_limits<double>::max();
 		timestamp = get_timestamp();
 		for(std::vector<_Edge>::iterator it = candidates.begin(); it != candidates.end(); it++) {
@@ -344,13 +344,34 @@ public:
 			double tmpDist = ComputeDistance(inputCoordinate, it->startCoord, it->targetCoord, tmp, &r);
 			if(tmpDist < dist) {
 				dist = tmpDist;
-				nearest = tmp;
+				outputCoordinate = tmp;
 			}
 		}
-		nearest.lat = 100000*(y2lat(static_cast<double>(nearest.lat)/100000.));
-		return nearest;
+		outputCoordinate.lat = 100000*(y2lat(static_cast<double>(outputCoordinate.lat)/100000.));
 	}
 
+    void FindNearestPointOnEdge(const _Coordinate& inputCoordinate, _Coordinate& outputCoordinate) {
+        unsigned fileIndex = GetFileIndexForLatLon(100000*(lat2y(static_cast<double>(inputCoordinate.lat)/100000.)), inputCoordinate.lon);
+         std::vector<_Edge> candidates;
+         for(int j = -32768; j < (32768+1); j+=32768) {
+             for(int i = -1; i < 2; i++) {
+                 GetContentsOfFileBucket(fileIndex+i+j, candidates);
+             }
+         }
+         _Coordinate tmp;
+         double dist = numeric_limits<double>::max();
+         for(std::vector<_Edge>::iterator it = candidates.begin(); it != candidates.end(); it++) {
+             double r = 0.;
+             double tmpDist = ComputeDistance(inputCoordinate, it->startCoord, it->targetCoord, tmp, &r);
+             if(tmpDist < dist) {
+                 dist = tmpDist;
+                 outputCoordinate.lat = round(100000*(y2lat(static_cast<double>(tmp.lat)/100000.)));
+                 outputCoordinate.lon = tmp.lon;
+             }
+         }
+    }
+
+
 private:
 	unsigned FillCell(std::vector<GridEntry>& entriesWithSameRAMIndex, unsigned fileOffset )
 	{

DataStructures/NodeInformationHelpDesk.h

@@ -58,8 +58,8 @@ public:
 	NodeID getNumberOfNodes() const { return numberOfNodes; }
 	NodeID getNumberOfNodes2() const { return int2ExtNodeMap->size(); }
 
-	inline void findNearestNodeCoordForLatLon(const _Coordinate coord, _Coordinate& result) {
-		result = readOnlyGrid->FindNearestPointOnEdge(coord);
+	inline void FindNearestNodeCoordForLatLon(const _Coordinate coord, _Coordinate& result) {
+		readOnlyGrid->FindNearestNodeInGraph(coord, result);
 	}
 
 	inline bool FindRoutingStarts(const _Coordinate start, const _Coordinate target, PhantomNodes * phantomNodes) {
@@ -67,6 +67,10 @@ public:
 		return true;
 	}
 
+	inline void FindNearestPointOnEdge(const _Coordinate & input, _Coordinate& output){
+	    readOnlyGrid->FindNearestPointOnEdge(input, output);
+	}
+
 	inline void RegisterThread(const unsigned k, const unsigned v) {
 		readOnlyGrid->threadLookup.Add(k, v);
 	}

Plugins/LocatePlugin.h

@@ -28,7 +28,7 @@ or see http://www.gnu.org/licenses/agpl.txt.
 #include "../DataStructures/NodeInformationHelpDesk.h"
 
 /*
- * This Plugin locates the nearest point on a street in the road network for a given coordinate.
+ * This Plugin locates the nearest node in the road network for a given coordinate.
  */
 class LocatePlugin : public BasePlugin {
 public:
@@ -41,7 +41,7 @@ public:
 		delete nodeHelpDesk;
 	}
 	std::string GetDescriptor() { return std::string("locate"); }
-	std::string GetVersionString() { return std::string("0.2a (DL)"); }
+	std::string GetVersionString() { return std::string("0.3 (DL)"); }
 	void HandleRequest(std::vector<std::string> parameters, http::Reply& reply) {
 		//check number of parameters
 		if(parameters.size() != 2) {
@@ -58,7 +58,7 @@ public:
 		}
 		//query to helpdesk
 		_Coordinate result;
-		nodeHelpDesk->findNearestNodeCoordForLatLon(_Coordinate(lat, lon), result);
+		nodeHelpDesk->FindNearestNodeCoordForLatLon(_Coordinate(lat, lon), result);
 
 		//Write to stream
 		reply.status = http::Reply::ok;

Plugins/NearestPlugin.h

@@ -0,0 +1,96 @@
+/*
+    open source routing machine
+    Copyright (C) Dennis Luxen, 2010
+
+This program is free software; you can redistribute it and/or modify
+it under the terms of the GNU AFFERO General Public License as published by
+the Free Software Foundation; either version 3 of the License, or
+any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU Affero General Public License
+along with this program; if not, write to the Free Software
+Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+or see http://www.gnu.org/licenses/agpl.txt.
+ */
+
+#ifndef NearestPlugin_H_
+#define NearestPlugin_H_
+
+#include <fstream>
+
+#include "BasePlugin.h"
+
+#include "../DataStructures/NodeInformationHelpDesk.h"
+
+/*
+ * This Plugin locates the nearest point on a street in the road network for a given coordinate.
+ */
+class NearestPlugin : public BasePlugin {
+public:
+	NearestPlugin(std::string ramIndexPath, std::string fileIndexPath, std::string nodesPath) {
+		nodeHelpDesk = new NodeInformationHelpDesk(ramIndexPath.c_str(), fileIndexPath.c_str());
+		ifstream nodesInStream(nodesPath.c_str(), ios::binary);
+		nodeHelpDesk->initNNGrid(nodesInStream);
+	}
+	~NearestPlugin() {
+		delete nodeHelpDesk;
+	}
+	std::string GetDescriptor() { return std::string("nearest"); }
+	std::string GetVersionString() { return std::string("0.3 (DL)"); }
+	void HandleRequest(std::vector<std::string> parameters, http::Reply& reply) {
+		//check number of parameters
+		if(parameters.size() != 2) {
+			reply = http::Reply::stockReply(http::Reply::badRequest);
+			return;
+		}
+
+		int lat = static_cast<int>(100000.*atof(parameters[0].c_str()));
+		int lon = static_cast<int>(100000.*atof(parameters[1].c_str()));
+
+		if(lat>90*100000 || lat <-90*100000 || lon>180*100000 || lon <-180*100000) {
+		    reply = http::Reply::stockReply(http::Reply::badRequest);
+		    return;
+		}
+		//query to helpdesk
+		_Coordinate result;
+		nodeHelpDesk->FindNearestPointOnEdge(_Coordinate(lat, lon), result);
+
+		//Write to stream
+		reply.status = http::Reply::ok;
+		reply.content.append("<?xml version=\"1.0\" encoding=\"UTF-8\"?>");
+		reply.content.append("<kml xmlns=\"http://www.opengis.net/kml/2.2\">");
+		reply.content.append("<Placemark>");
+
+		std::stringstream out1;
+		out1 << setprecision(10);
+		out1 << "<name>Nearest Place in map to " << lat/100000. << "," << lon/100000. << "</name>";
+		reply.content.append(out1.str());
+		reply.content.append("<Point>");
+
+		std::stringstream out2;
+		out2 << setprecision(10);
+		out2 << "<coordinates>" << result.lon / 100000. << "," << result.lat / 100000.  << "</coordinates>";
+		reply.content.append(out2.str());
+		reply.content.append("</Point>");
+		reply.content.append("</Placemark>");
+		reply.content.append("</kml>");
+
+		reply.headers.resize(3);
+		reply.headers[0].name = "Content-Length";
+		reply.headers[0].value = boost::lexical_cast<std::string>(reply.content.size());
+		reply.headers[1].name = "Content-Type";
+		reply.headers[1].value = "application/vnd.google-earth.kml+xml";
+		reply.headers[2].name = "Content-Disposition";
+		reply.headers[2].value = "attachment; filename=\"placemark.kml\"";
+		return;
+	}
+private:
+	NodeInformationHelpDesk * nodeHelpDesk;
+};
+
+#endif /* NearestPlugin_H_ */

routed.cpp

@@ -33,6 +33,7 @@ or see http://www.gnu.org/licenses/agpl.txt.
 #include "Plugins/BasicDescriptor.h"
 #include "Plugins/HelloWorldPlugin.h"
 #include "Plugins/LocatePlugin.h"
+#include "Plugins/NearestPlugin.h"
 #include "Plugins/RoutePlugin.h"
 #include "Util/InputFileUtil.h"
 
@@ -62,11 +63,17 @@ int main (int argc, char *argv[])
 		BasePlugin * helloWorld = new HelloWorldPlugin();
 		h.RegisterPlugin(helloWorld);
 
-		BasePlugin * locate = new LocatePlugin(
-				serverConfig.GetParameter("ramIndex"),
-				serverConfig.GetParameter("fileIndex"),
-				serverConfig.GetParameter("nodesData"));
-		h.RegisterPlugin(locate);
+        BasePlugin * locate = new LocatePlugin(
+                serverConfig.GetParameter("ramIndex"),
+                serverConfig.GetParameter("fileIndex"),
+                serverConfig.GetParameter("nodesData"));
+        h.RegisterPlugin(locate);
+
+        BasePlugin * nearest = new NearestPlugin(
+                serverConfig.GetParameter("ramIndex"),
+                serverConfig.GetParameter("fileIndex"),
+                serverConfig.GetParameter("nodesData"));
+        h.RegisterPlugin(nearest);
 
 		BasePlugin * route = new RoutePlugin<BasicDescriptor>(
 				serverConfig.GetParameter("hsgrData"),