Function decodePolyline

include/engine/polyline_compressor.hpp:55–76

template <unsigned POLYLINE_PRECISION = 100000>
std::vector<util::Coordinate> decodePolyline(const std::string &polyline)
{
    double polyline_to_coordinate = COORDINATE_PRECISION / POLYLINE_PRECISION;
    std::vector<util::Coordinate> coordinates;
    std::int32_t latitude = 0, longitude = 0;

    std::string::const_iterator first = polyline.begin();
    const std::string::const_iterator last = polyline.end();
    while (first != last)
    {
        const auto dlat = detail::decode_polyline_integer(first, last);
        const auto dlon = detail::decode_polyline_integer(first, last);

        latitude += dlat;
        longitude += dlon;

        coordinates.emplace_back(util::Coordinate{
            util::FixedLongitude{static_cast<std::int32_t>(longitude * polyline_to_coordinate)},
            util::FixedLatitude{static_cast<std::int32_t>(latitude * polyline_to_coordinate)}});
    }
    return coordinates;
}
} // namespace osrm::engine

#endif /* POLYLINECOMPRESSOR_H_ */