79 lines
2.3 KiB
C
79 lines
2.3 KiB
C
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/*
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open source routing machine
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Copyright (C) Dennis Luxen, others 2010
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU AFFERO General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU Affero General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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or see http://www.gnu.org/licenses/agpl.txt.
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*/
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#ifndef POLYLINECOMPRESSOR_H_
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#define POLYLINECOMPRESSOR_H_
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#include "ExtractorStructs.h"
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class PolylineCompressor {
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private:
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inline string encodeSignedNumber(int number) const {
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int signedNumber = number << 1;
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if (number < 0) {
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signedNumber = ~(signedNumber);
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}
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return (encodeNumber(signedNumber));
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}
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inline string encodeNumber(int numberToEncode) const {
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ostringstream encodeString;
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while (numberToEncode >= 0x20) {
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int nextValue = (0x20 | (numberToEncode & 0x1f)) + 63;
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encodeString << (static_cast<char> (nextValue));
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numberToEncode >>= 5;
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}
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numberToEncode += 63;
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encodeString << (static_cast<char> (numberToEncode));
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return encodeString.str();
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}
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public:
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inline void printEncodedString(vector<_Coordinate>& polyline, string &output) {
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output += encodeSignedNumber(polyline[0].lat);
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output += encodeSignedNumber(polyline[0].lon);
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for(unsigned i = 1; i < polyline.size(); i++) {
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output += encodeSignedNumber(polyline[i].lat - polyline[i-1].lat);
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output += encodeSignedNumber(polyline[i].lon - polyline[i-1].lon);
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}
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}
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inline void printUnencodedString(vector<_Coordinate> & polyline, string & output) {
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string tmp;
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for(unsigned i = 0; i < polyline.size(); i++) {
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convertLatLon(polyline[i].lat, tmp);
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output += "[";
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output += tmp;
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convertLatLon(polyline[i].lon, tmp);
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output += ", ";
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output += tmp;
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output += "]";
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if( i < polyline.size()-1 ) {
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output += ",";
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}
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}
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}
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};
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#endif /* POLYLINECOMPRESSOR_H_ */
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