144 lines
5.0 KiB
C++
144 lines
5.0 KiB
C++
/*
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Copyright (c) 2013, Project OSRM, Dennis Luxen, others
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All rights reserved.
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Redistribution and use in source and binary forms, with or without modification,
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are permitted provided that the following conditions are met:
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Redistributions of source code must retain the above copyright notice, this list
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of conditions and the following disclaimer.
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Redistributions in binary form must reproduce the above copyright notice, this
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list of conditions and the following disclaimer in the documentation and/or
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other materials provided with the distribution.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
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ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
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ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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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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