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Fix numerical problems with polyline

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This commit is contained in:
Patrick Niklaus 2016-03-04 00:36:36 +01:00
parent bcfbc0cf6c
commit 33f083b213
1 changed files with 7 additions and 7 deletions
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14
src/engine/polyline_compressor.cpp
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@ -68,16 +68,16 @@ std::string encodePolyline(CoordVectorForwardIter begin, CoordVectorForwardIter
std::vector<int> delta_numbers;
BOOST_ASSERT(size > 0);
delta_numbers.reserve((size - 1) * 2);
util::Coordinate previous_coordinate{util::FixedLongitude(0), util::FixedLatitude(0)};
std::for_each(begin, end, [&delta_numbers, &previous_coordinate](const util::Coordinate loc)
int current_lat = 0;
int current_lon = 0;
std::for_each(begin, end, [&delta_numbers, &current_lat, &current_lon](const util::Coordinate loc)
{
const int lat_diff = static_cast<int>(loc.lat - previous_coordinate.lat) *
detail::COORDINATE_TO_POLYLINE;
const int lon_diff = static_cast<int>(loc.lon - previous_coordinate.lon) *
detail::COORDINATE_TO_POLYLINE;
const int lat_diff = std::round(static_cast<int>(loc.lat) * detail::COORDINATE_TO_POLYLINE) - current_lat;
const int lon_diff = std::round(static_cast<int>(loc.lon) * detail::COORDINATE_TO_POLYLINE) - current_lon;
delta_numbers.emplace_back(lat_diff);
delta_numbers.emplace_back(lon_diff);
previous_coordinate = loc;
current_lat += lat_diff;
current_lon += lon_diff;
});
return encode(delta_numbers);
}