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Write rings in opposite order since Y axis is inverted (relative to B… #901

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Merged
systemed merged 1 commit into from
May 23, 2026
Merged

Write rings in opposite order since Y axis is inverted (relative to B… #901

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21 changes: 13 additions & 8 deletions src/tile_worker.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -192,15 +192,18 @@ bool writeRing(

bool firstPoint = true;
fbuilder.add_ring(points);
for (const Point& point : ring) {
pair<int, int> xy = std::make_pair(point.get<0>(), point.get<1>());
for (auto it = ring.rbegin(); it != ring.rend(); ++it) {
const Point& point = *it;

if (firstPoint || xy != lastXy) {
firstPoint = false;
lastXy = xy;
fbuilder.set_point(xy.first, xy.second);
}
}
pair<int, int> xy =
std::make_pair(point.get<0>(), point.get<1>());

if (firstPoint || xy != lastXy) {
firstPoint = false;
lastXy = xy;
fbuilder.set_point(xy.first, xy.second);
}
}

return true;
}
Expand Down Expand Up @@ -229,6 +232,8 @@ void writeMultiPolygon(
if (geom::is_empty(current))
return;

geom::correct(current);

geom::validity_failure_type failure;
if (verbose && !geom::is_valid(current, failure)) {
cout << "output multipolygon has " << boost_validity_error(failure) << endl;
Expand Down
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