Fix for creating bounding box that span the antimeridian

maparoni · Oct 21, 2022 · 7e5d8ba · 7e5d8ba
1 parent 678daa8
commit 7e5d8ba
Showing 1 changed file with 5 additions and 4 deletions.
diff --git a/Sources/GeoJSONKitTurf/Turf+BoundingBox.swift b/Sources/GeoJSONKitTurf/Turf+BoundingBox.swift
@@ -41,14 +41,15 @@ extension GeoJSON.BoundingBox {
   }
 
   public init(positions: [GeoJSON.Position], allowSpanningAntimeridian: Bool) {
-    guard allowSpanningAntimeridian, let first = positions.first else {
+    guard allowSpanningAntimeridian, !positions.isEmpty else {
       self.init(positions: positions)
       return
     }
 
-    self = positions.dropFirst()
-      .sorted { $0.longitude < $1.longitude }
-      .reduce(into: GeoJSON.BoundingBox(positions: [first])) { box, next in
+    let sorted = positions.sorted { $0.longitude < $1.longitude }
+
+    self = sorted.dropFirst()
+      .reduce(into: GeoJSON.BoundingBox(positions: Array(sorted.prefix(1)))) { box, next in
         box.append(next, allowSpanningAntimeridian: allowSpanningAntimeridian)
       }
   }