137 lines
4.5 KiB
C++
137 lines
4.5 KiB
C++
/*
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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 "../DataStructures/SegmentInformation.h"
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#include "../Util/StringUtil.h"
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#include <string>
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class PolylineCompressor {
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private:
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inline void encodeVectorSignedNumber(std::vector<int> & numbers, std::string & output) const {
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for(unsigned i = 0; i < numbers.size(); ++i) {
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numbers[i] <<= 1;
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if (numbers[i] < 0) {
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numbers[i] = ~(numbers[i]);
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}
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}
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for(unsigned i = 0; i < numbers.size(); ++i) {
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encodeNumber(numbers[i], output);
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}
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}
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inline void encodeNumber(int numberToEncode, std::string & output) const {
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while (numberToEncode >= 0x20) {
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int nextValue = (0x20 | (numberToEncode & 0x1f)) + 63;
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output += (static_cast<char> (nextValue));
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if(92 == nextValue)
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output += (static_cast<char> (nextValue));
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numberToEncode >>= 5;
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}
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numberToEncode += 63;
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output += (static_cast<char> (numberToEncode));
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if(92 == numberToEncode)
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output += (static_cast<char> (numberToEncode));
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}
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public:
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inline void printEncodedString(
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const std::vector<SegmentInformation> & polyline,
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std::string & output
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) const {
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std::vector<int> deltaNumbers;
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output += "\"";
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if(!polyline.empty()) {
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FixedPointCoordinate lastCoordinate = polyline[0].location;
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deltaNumbers.push_back( lastCoordinate.lat );
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deltaNumbers.push_back( lastCoordinate.lon );
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for(unsigned i = 1; i < polyline.size(); ++i) {
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if(!polyline[i].necessary)
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continue;
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deltaNumbers.push_back(polyline[i].location.lat - lastCoordinate.lat);
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deltaNumbers.push_back(polyline[i].location.lon - lastCoordinate.lon);
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lastCoordinate = polyline[i].location;
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}
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encodeVectorSignedNumber(deltaNumbers, output);
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}
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output += "\"";
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}
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inline void printEncodedString(const std::vector<FixedPointCoordinate>& polyline, std::string &output) const {
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std::vector<int> deltaNumbers(2*polyline.size());
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output += "\"";
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if(!polyline.empty()) {
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deltaNumbers[0] = polyline[0].lat;
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deltaNumbers[1] = polyline[0].lon;
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for(unsigned i = 1; i < polyline.size(); ++i) {
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deltaNumbers[(2*i)] = (polyline[i].lat - polyline[i-1].lat);
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deltaNumbers[(2*i)+1] = (polyline[i].lon - polyline[i-1].lon);
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}
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encodeVectorSignedNumber(deltaNumbers, output);
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}
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output += "\"";
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}
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inline void printUnencodedString(std::vector<FixedPointCoordinate> & polyline, std::string & output) const {
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output += "[";
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std::string tmp;
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for(unsigned i = 0; i < polyline.size(); i++) {
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convertInternalLatLonToString(polyline[i].lat, tmp);
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output += "[";
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output += tmp;
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convertInternalLatLonToString(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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output += "]";
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}
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inline void printUnencodedString(std::vector<SegmentInformation> & polyline, std::string & output) const {
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output += "[";
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std::string tmp;
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for(unsigned i = 0; i < polyline.size(); i++) {
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if(!polyline[i].necessary)
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continue;
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convertInternalLatLonToString(polyline[i].location.lat, tmp);
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output += "[";
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output += tmp;
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convertInternalLatLonToString(polyline[i].location.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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output += "]";
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}
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};
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#endif /* POLYLINECOMPRESSOR_H_ */
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