Adding support for polyline compression. Reduces file size, see http://open.mapquestapi.com/common/encodedecode.html

DataStructures/PolylineCompressor.h

@@ -0,0 +1,78 @@
+/*
+    open source routing machine
+    Copyright (C) Dennis Luxen, others 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 POLYLINECOMPRESSOR_H_
+#define POLYLINECOMPRESSOR_H_
+
+#include "ExtractorStructs.h"
+
+class PolylineCompressor {
+private:
+	inline string encodeSignedNumber(int number) const {
+	    int signedNumber = number << 1;
+	    if (number < 0) {
+	        signedNumber = ~(signedNumber);
+	    }
+	    return (encodeNumber(signedNumber));
+	}
+
+	inline string encodeNumber(int numberToEncode) const {
+	    ostringstream encodeString;
+
+	    while (numberToEncode >= 0x20) {
+	        int nextValue = (0x20 | (numberToEncode & 0x1f)) + 63;
+	        encodeString << (static_cast<char> (nextValue));
+	        numberToEncode >>= 5;
+	    }
+
+	    numberToEncode += 63;
+	    encodeString << (static_cast<char> (numberToEncode));
+
+	    return encodeString.str();
+	}
+public:
+	inline void printEncodedString(vector<_Coordinate>& polyline, string &output) {
+		output += encodeSignedNumber(polyline[0].lat);
+		output += encodeSignedNumber(polyline[0].lon);
+		for(unsigned i = 1; i < polyline.size(); i++) {
+			output += encodeSignedNumber(polyline[i].lat - polyline[i-1].lat);
+			output += encodeSignedNumber(polyline[i].lon - polyline[i-1].lon);
+		}
+	}
+
+	inline void printUnencodedString(vector<_Coordinate> & polyline, string & output) {
+		string tmp;
+		for(unsigned i = 0; i < polyline.size(); i++) {
+			convertLatLon(polyline[i].lat, tmp);
+			output += "[";
+			output += tmp;
+			convertLatLon(polyline[i].lon, tmp);
+			output += ", ";
+			output += tmp;
+			output += "]";
+			if( i < polyline.size()-1 ) {
+				output += ",";
+			}
+		}
+
+	}
+};
+
+#endif /* POLYLINECOMPRESSOR_H_ */

Plugins/BaseDescriptor.h

@@ -29,13 +29,17 @@ or see http://www.gnu.org/licenses/agpl.txt.
 #include "../typedefs.h"
 #include "../DataStructures/ExtractorStructs.h"
 #include "../DataStructures/HashTable.h"
+#include "../DataStructures/PolylineCompressor.h"
 #include "../Util/StrIngUtil.h"
 
 struct DescriptorConfig {
-    DescriptorConfig() : instructions(true), geometry(true), z(18) {}
+    DescriptorConfig() : instructions(true), geometry(true), encodeGeometry(false), z(18) {}
     bool instructions;
     bool geometry;
+    bool encodeGeometry;
     unsigned short z;
+
+    PolylineCompressor pc;
 };
 
 template<class SearchEngineT>

Plugins/JSONDescriptor.h

@@ -19,6 +19,7 @@ or see http://www.gnu.org/licenses/agpl.txt.
  */
 
 #include "BaseDescriptor.h"
+#include "../DataStructures/PolylineCompressor.h"
 
 #ifndef JSONDESCRIPTOR_H_
 #define JSONDESCRIPTOR_H_
@@ -29,6 +30,7 @@ template<class SearchEngineT>
 class JSONDescriptor : public BaseDescriptor<SearchEngineT> {
 private:
     DescriptorConfig config;
+    vector<_Coordinate> polyline;
 public:
     JSONDescriptor() {}
     void SetConfig(const DescriptorConfig c) {
@@ -104,13 +106,7 @@ public:
             routeInstructionString += direction;
 
             //put start coord to linestring;
-            convertLatLon(phantomNodes->startCoord.lat, tmp);
+            polyline.push_back(phantomNodes->startCoord);
-            routeGeometryString += "[";
-            routeGeometryString += tmp;
-            routeGeometryString += ", ";
-            convertLatLon(phantomNodes->startCoord.lon, tmp);
-            routeGeometryString += tmp;
-            routeGeometryString += "],";
 
             _Coordinate previous(phantomNodes->startCoord.lat, phantomNodes->startCoord.lon);
             _Coordinate next, current, lastPlace, startOfSegment;
@@ -147,13 +143,8 @@ public:
                 //                std::cout << "Area for: " << area << std::endl;
                 if(area > areaThresholds[config.z] || 19 == config.z) {
                     painted++;
-                    convertLatLon(current.lat, tmp);
+                	polyline.push_back(current);
-                    routeGeometryString += "[";
+
-                    routeGeometryString += tmp;
-                    routeGeometryString += ", ";
-                    convertLatLon(current.lon, tmp);
-                    routeGeometryString += tmp;
-                    routeGeometryString += "],";
                     position++;
                     startOfSegment = current;
                 } else {
@@ -200,8 +191,6 @@ public:
                     routeInstructionString += "],";
 
                     string lat; string lon;
-                    convertLatLon(lastPlace.lon, lon);
-                    convertLatLon(lastPlace.lat, lat);
                     lastPlace = current;
                     routeInstructionString += "[\"";
 
@@ -264,13 +253,7 @@ public:
             string lat; string lon;
 
             //put targetCoord to linestring
-            convertLatLon(phantomNodes->targetCoord.lat, tmp);
+            polyline.push_back(phantomNodes->targetCoord);
-            routeGeometryString += "[";
-            routeGeometryString += tmp;
-            routeGeometryString += ", ";
-            convertLatLon(phantomNodes->targetCoord.lon, tmp);
-            routeGeometryString += tmp;
-            routeGeometryString += "]";
             position++;
 
             //give complete distance in meters;
@@ -305,6 +288,11 @@ public:
         reply.content += "},";
         reply.content += "\"route_geometry\": [";
         if(config.geometry) {
+        	if(config.encodeGeometry)
+        		config.pc.printEncodedString(polyline, routeGeometryString);
+        	else
+        		config.pc.printUnencodedString(polyline, routeGeometryString);
+
             reply.content += routeGeometryString;
         }
         reply.content += "],";

Plugins/RoutePlugin.h

@@ -119,6 +119,9 @@ public:
             descriptorConfig.geometry = false;
         }
 
+        if("cmp" == routeParameters.options.Find("geomformat") || "cmp6" == routeParameters.options.Find("geomformat")  ) {
+            descriptorConfig.encodeGeometry = true;
+        }
 
         switch(descriptorType){
         case 0: