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core: check if edge length is zero for rounded corners (#4424)

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Yaroslav
2026-07-22 18:57:57 +03:00
committed by GitHub
parent b288c6dee6
commit 702ebc6114
1 changed files with 10 additions and 2 deletions
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12
src/mbgl/tile/geometry_tile_data.cpp
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@@ -316,12 +316,20 @@ GeometryCollectionFloat roundPolygonCorners(GeometryCollection& polygon, double
auto cornerPoint = convertPoint<double>(ring[i]);
auto nextPoint = convertPoint<double>(ring[(i + 1) % nVertices]);
auto edge1Len = util::dist<double>(cornerPoint, prevPoint);
auto edge2Len = util::dist<double>(cornerPoint, nextPoint);
if (edge1Len == 0.0 || edge2Len == 0.0) {
// Duplicate vertex: no direction to round, keep it as-is.
roundedCornerRing.emplace_back(convertPoint<float>(ring[i]));
continue;
}
// Compute the start and end points of the rounded corner
auto edge1Vector = util::normal<double>(prevPoint, cornerPoint);
auto edge2Vector = util::normal<double>(cornerPoint, nextPoint);
auto edge1MaxCornerDistance = util::dist<double>(cornerPoint, prevPoint) * maxEdgeLenPercent;
auto edge2MaxCornerDistance = util::dist<double>(cornerPoint, nextPoint) * maxEdgeLenPercent;
auto edge1MaxCornerDistance = edge1Len * maxEdgeLenPercent;
auto edge2MaxCornerDistance = edge2Len * maxEdgeLenPercent;
auto cornerDistance = std::min({desiredCornerDistance, edge1MaxCornerDistance, edge2MaxCornerDistance});
auto startPoint = cornerPoint - edge1Vector * cornerDistance;