From 29b278d76d517814d786bcf573c86e7514698219 Mon Sep 17 00:00:00 2001
From: Masashi Katsumata <wf9a5m75@gmail.com>
Date: Sat, 7 Nov 2026 21:47:37 -0800
Subject: [PATCH 1/2] Interpolate the closing edge of geodesic polygons

ringPath densified a geodesic ring with createInterpolatePoints, which only
interpolates between neighbouring points. Rings arrive open, so the
closing edge (last vertex -> first) stayed a straight chord in both fill
and outline (Boston -> London -> Iceland: the Iceland -> Boston edge).
Use ios-sdk-core's densifyGeodesicRing. geodesic=false is unchanged.

Requires the ios-sdk-core release that adds densifyGeodesicRing.
---
 .../polygon/GoogleMapPolygonOverlayRenderer.swift             | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/Sources/MapConductorForGoogleMaps/polygon/GoogleMapPolygonOverlayRenderer.swift b/Sources/MapConductorForGoogleMaps/polygon/GoogleMapPolygonOverlayRenderer.swift
index 100c572..0be4433 100644
--- a/Sources/MapConductorForGoogleMaps/polygon/GoogleMapPolygonOverlayRenderer.swift
+++ b/Sources/MapConductorForGoogleMaps/polygon/GoogleMapPolygonOverlayRenderer.swift
@@ -110,7 +110,9 @@ final class GoogleMapPolygonOverlayRenderer: AbstractPolygonOverlayRenderer<GMSP
             return cached
         }
 
-        let path = makePath(WGS84Geodesic.createInterpolatePoints(points, maxSegmentLength: maxSegmentLength))
+        // リングの閉じる辺（末尾 → 先頭）も大圏で補間する。隣り合う点の間だけを補間すると、閉じる辺が
+        // 直線の弦になり、塗りも輪郭（同じ GMSPolygon の stroke）もそこだけ直線になる。
+        let path = makePath(densifyGeodesicRing(points, maxSegmentLength: maxSegmentLength))
         interpolationCache.put(key, path)
         return path
     }

From 265a72b4eddde7ce1f1111a14838f4a222f07b9a Mon Sep 17 00:00:00 2001
From: Masashi Katsumata <wf9a5m75@gmail.com>
Date: Sat, 7 Nov 2026 23:26:58 -0800
Subject: [PATCH 2/2] Densify the closing edge of non-geodesic polygons too

A geodesic=false ring went through Planar.createInterpolatePoints, which
only interpolates between neighbouring points, so the closing edge (last
vertex -> first) stayed one straight Web Mercator segment while the other
edges - and polylines with geodesic=false - follow linear lat/lng
interpolation. Use ios-sdk-core's densifyPolygonRing for both modes (it
replaces the unreleased densifyGeodesicRing). Same as android-for-googlemaps.

Requires the ios-sdk-core release that adds densifyPolygonRing.
---
 .../polygon/GoogleMapPolygonOverlayRenderer.swift           | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/Sources/MapConductorForGoogleMaps/polygon/GoogleMapPolygonOverlayRenderer.swift b/Sources/MapConductorForGoogleMaps/polygon/GoogleMapPolygonOverlayRenderer.swift
index 0be4433..b9c57cc 100644
--- a/Sources/MapConductorForGoogleMaps/polygon/GoogleMapPolygonOverlayRenderer.swift
+++ b/Sources/MapConductorForGoogleMaps/polygon/GoogleMapPolygonOverlayRenderer.swift
@@ -92,7 +92,9 @@ final class GoogleMapPolygonOverlayRenderer: AbstractPolygonOverlayRenderer<GMSP
         mapView: GMSMapView
     ) -> GMSPath {
         if !geodesic {
-            return makePath(Planar.createInterpolatePoints(points))
+            // geodesic=false も閉じる辺（末尾 → 先頭）を緯度経度で線形補間する（輪郭のポリラインと同じ線。
+            // 補間しないと閉じる辺だけメルカトルの直線になる）。
+            return makePath(densifyPolygonRing(points, geodesic: false))
         }
 
         let camera = mapView.camera
@@ -112,7 +114,7 @@ final class GoogleMapPolygonOverlayRenderer: AbstractPolygonOverlayRenderer<GMSP
 
         // リングの閉じる辺（末尾 → 先頭）も大圏で補間する。隣り合う点の間だけを補間すると、閉じる辺が
         // 直線の弦になり、塗りも輪郭（同じ GMSPolygon の stroke）もそこだけ直線になる。
-        let path = makePath(densifyGeodesicRing(points, maxSegmentLength: maxSegmentLength))
+        let path = makePath(densifyPolygonRing(points, geodesic: true, maxSegmentLength: maxSegmentLength))
         interpolationCache.put(key, path)
         return path
     }