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Interpolate the closing edge of polygons, geodesic or not #13

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Merged
wf9a5m75 merged 2 commits into from
Nov 8, 2026
Merged

Interpolate the closing edge of polygons, geodesic or not #13

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c260d29
Interpolate the closing edge of geodesic polygons
wf9a5m75 Nov 8, 2026
a195afa
Densify the closing edge of non-geodesic polygons too
wf9a5m75 Nov 8, 2026
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7 changes: 3 additions & 4 deletions Sources/MapConductorForMapKit/polygon/MapKitPolygonOverlayRenderer.swift
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Original file line number Diff line number Diff line change
Expand Up @@ -132,10 +132,9 @@ final class MapKitPolygonOverlayRenderer: AbstractPolygonOverlayRenderer<MKPolyg
/// リングをコア共通の補間（geodesic は球面補間・非 geodesic は線形補間）で密度化して
/// `CLLocationCoordinate2D` へ変換する。外周・穴の両方に同じ処理を通す。
private func ring(_ points: [GeoPointProtocol], geodesic: Bool) -> [CLLocationCoordinate2D] {
let geoPoints: [GeoPointProtocol] = geodesic
? WGS84Geodesic.createInterpolatePoints(points)
: Planar.createInterpolatePoints(points)
return geoPoints.map { CLLocationCoordinate2D(latitude: $0.latitude, longitude: $0.longitude) }
// 閉じる辺（末尾 → 先頭）も他の辺と同じく補間する（塗りと輪郭が同じ MKPolygon）。
// geodesic は大圏、geodesic=false は緯度経度の線形補間（ポリラインの false と同じ線）。
densifyPolygonRing(points, geodesic: geodesic).map { CLLocationCoordinate2D(latitude: $0.latitude, longitude: $0.longitude) }
}
}

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