Version 0.4.0 (#9)

* Update example app to use remote dependency
* Embed image in repo (#2)
* Add function for annular sectors (#4)
* Add Swiftlint
* Enable adding label without icon (#7)
* Enable export by KMZ (#7) 
* Update readme
* Use Sector and Segment correctly (#8)

Author: danleedham

.github/workflows/swiftlint.yml

@@ -13,9 +13,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v1
-      - name: GitHub Action for SwiftLint
-        uses: norio-nomura/action-swiftlint@3.2.1
       - name: GitHub Action for SwiftLint with --strict
         uses: norio-nomura/action-swiftlint@3.2.1
         with:
-          args: --strict
+          args: --fix --quiet

Example/ForeFlightKMLDemo.xcodeproj/project.xcworkspace/xcshareddata/swiftpm/Package.resolved

@@ -4,7 +4,7 @@ import CoreLocation
 import ForeFlightKML
 
 enum KMLGenerator {
-    static func generateCircleKML(center: CLLocationCoordinate2D, radiusMeters: Double) -> String {
+    static func generateCircleKML(center: CLLocationCoordinate2D, radiusMeters: Double) throws -> Data? {
         let builder = ForeFlightKMLBuilder(documentName: "Foreflight KML Demo")
 
         let centerCoordinate = Coordinate(latitude: center.latitude, longitude: center.longitude)
@@ -23,7 +23,8 @@ enum KMLGenerator {
             radiusMeters: radiusMeters * 2,
             style: PolygonStyle(outlineColor: .black, fillColor: .warning.withAlpha(0.3)))
 
-        return builder.build()
+        return try builder.buildKMZ()
+
     }
 
     static func polygonCoordinatesForMap(center: CLLocationCoordinate2D, radiusMeters: Double) -> [CLLocationCoordinate2D] {

Example/ForeFlightKMLDemo/KML/KMLGenerator.swift

@@ -48,19 +48,19 @@ struct ContentView: View {
 
     private func handleMapTap(_ coord: CLLocationCoordinate2D) {
         lastTapCoordinate = coord
+        do {
+            let kmz = try KMLGenerator.generateCircleKML(center: coord, radiusMeters: defaultRadiusMeters)
 
-        let kml = KMLGenerator.generateCircleKML(center: coord, radiusMeters: defaultRadiusMeters)
+            let dateFormatter = DateFormatter()
+            dateFormatter.dateFormat = "yyyyMMdd'T'HHmmss'Z'"
 
-        let dateFormatter = DateFormatter()
-        dateFormatter.dateFormat = "yyyyMMdd'T'HHmmss'Z'"
+            let tmpURL = FileManager.default.temporaryDirectory.appendingPathComponent("\(dateFormatter.string(from: Date())).kmz")
 
-        let tmpURL = FileManager.default.temporaryDirectory.appendingPathComponent("\(dateFormatter.string(from: Date())).kml")
-        do {
-            try kml.data(using: .utf8)?.write(to: tmpURL)
+            try kmz?.write(to: tmpURL)
             kmlToShareURL = tmpURL
             showingShare = true
         } catch {
-            print("Failed to write KML: \(error)")
+            print("Failed to write KMZ: \(error)")
             kmlToShareURL = nil
         }
     }

Example/ForeFlightKMLDemo/Views/ContentView.swift

@@ -11,13 +11,18 @@ let package = Package(
         )
     ],
     dependencies: [
-        .package(url: "https://github.com/florianreinhart/Geodesy", .upToNextMajor(from: "0.2.2"))
+        .package(url: "https://github.com/florianreinhart/Geodesy", .upToNextMajor(from: "0.2.2")),
+        .package(url: "https://github.com/weichsel/ZIPFoundation.git", from: "0.9.0")
     ],
     targets: [
         .target(
             name: "ForeFlightKML",
             dependencies: [
-                .product(name: "Geodesy", package: "Geodesy")
+                .product(name: "Geodesy", package: "Geodesy"),
+                .product(name: "ZIPFoundation", package: "ZIPFoundation")
+            ],
+            resources: [
+                .process("Resources")
             ]
         ),
         .testTarget(

Package.resolved

@@ -2,26 +2,21 @@
 
 > Swift framework to build KML files in Jeppesen ForeFlight friendly format. 
 
-This package provides a small, focused API for composing KML documents suitable for importing into ForeFlight as **User Map Shapes (KML)**. It intentionally avoids UI concerns — it gives you `String` KML output (or bytes) which your app can write to disk and share using the standard iOS share sheet.
+This package provides a small, focused API for composing KML/KMZ documents suitable for importing into ForeFlight as **User Map Shapes (KML)**. It intentionally avoids UI concerns — it gives you `String` KML output (or bytes) which your app can write to disk and share using the standard iOS share sheet.
 
----
 
 ## Quick highlights
 
-- Compose `Placemark`s with `Point`, `LineString`, `Polygon` and derived geometry helpers (circles, arc segments, etc.).
+- Compose `Placemark`s with `Point`, `LineString`, `Polygon` and derived geometry helpers (circles, arc sectors, etc.).
 - Create reusable styles (`Style`, `LineStyle`, `PolyStyle`, `IconStyle`, `LabelStyle`) and assign them to placemarks.
-- `ForeFlightKMLBuilder` collects placemarks and styles, emits a complete `kml` document string.
+- `ForeFlightKMLBuilder` collects placemarks and styles, emits a complete `kml` or `kmz` document .
 - Lightweight — no UI code.
 
----
-
 ## Install
-
 1. In Xcode: **File › Add Packages...**
 2. Enter the repository URL.
 3. Choose the `ForeFlightKML` package product and add it to your app target.
 
----
 
 ## Example Output 
 Using the example given on the [ForeFlight website](https://foreflight.com/support/user-map-shapes/) the below is generated using this Framework. 
@@ -30,27 +25,23 @@ See `/Tests/ForeFlightKMLTests/UserMapShapesSampleFullTest.swift`
 
 <img width="615" height="770" alt="Image" src="/docs/example-output.png" />
 
-## Minimal Quick Start
+## Quick Start
 
 ```swift
 import ForeFlightKML
-import Geodesy (we use this for Coordinate and relative positioniong)
+import Geodesy (used for coordinates)
 
-// Example: Airport Traffic Pattern
 let builder = ForeFlightKMLBuilder(documentName: "Airport with ATZ")
-
-// Runway centerline
 builder.addLine(
     name: "Runway 15-33", 
     coordinates: [Coordinate(latitude:, longitude:),Coordinate(latitude:, longitude:)],
     style: LineStyle(color: .black)
 )
 
-// Traffic Warning Area
 builder.addLineCircle(
     name: "Airport ATZ", 
-    center: airportCenter, 
-    radiusMeters: 4630, // 2.5 nautical mile ATZ
+    center: Coordinate(latitude:, longitude:), 
+    radiusMeters: 4630,
     PolygonStyle(outlineColor: .black, fillColor: .warning.withAlpha(0.3))
 )
 
@@ -60,19 +51,40 @@ presentShareSheet(with: url)
 ```
 
 > **Note**: ForeFlight supports importing KML/KMZ files via the iOS share sheet. See ForeFlight's docs for exact import behavior.
----
 
-## API quick reference (important types)
 
-- `ForeFlightKMLBuilder` — builder for the KML document. Methods: `addPlacemark(_:)`, `kmlString()`.
+## API Reference
+
+### KMLBuidler
+ `ForeFlightKMLBuilder` is the builder for the KML/KMZ document. 
+ - Document name can be set on `init` or with `setDocumentName()` 
+ - Elements can be manually added using `addPlacemark(_:)`
+ - The output is accessed by: for KML `try builder.build()` or for KMZ: `try builder.buildKMZ()`
+
+### KMLBuilder Convenience Elements
+ - `addPoint` Add a point with style.
+ - `addLine` Add a line connecting multiple coordinates.
+ - `addLineCircle` Add a circular line (approximated by line segments).
+ - `addLineSector` Add an arc sector line geometry.
+ - `addPolygon` Add a polygon with outer boundary and optional holes.
+ - `addPolygonCircle` Add a polygon with outer boundary and optional holes.
+ - `addPolygonSector` Add a filled sector polygon (pie slice).
+ - `addPolygonAnnularSector` Add a filled annular (ring) sector polygon.
+ - `addLabel` Add a text-only label placemark at a coordinate.
+
+### ForeflightKMLBuilder Export formats
+- `kml String` via `builder.build()`
+- `kml Data` via `builder.kmlData()`
+- `kmz Data` via `builder.buildKMZ()` 
+- KMZ (zipped KML) is required when using custom icons or using labelBadge (which uses a transparent .png under the hood). 
+
+### Underlying elements
 - `Placemark` — a Feature containing a geometry (must implement `KMLElement`). Optionally attach a `KMLStyle`.
-- Geometry types: `Point`, `Line`, `LineCircle`, `LineSegment` (segment of a Circle), `Polygon`, `PolygonCircle` (filled circle), `PolygonSegment` (filled segment) `LinearRing`.
+- Geometry types: `Point`, `Line`, `LineCircle`, `LineSector` (sector of a Circle), `Polygon`, `PolygonCircle` (filled circle), `PolygonSector` (filled sector) `LinearRing`.
 - `Style` and substyles: `LineStyle`, `PolyStyle`, `IconStyle`, `LabelStyle`.
 - `KMLColor` — helper to create the aabbggrr color values used by KML.
 
-Full public API surface is visible in the package sources; the README examples show common usage patterns.
-
----
+Full public API surface is visible in the package sources.
 
 ## Notes, conventions and gotchas
 
@@ -81,13 +93,10 @@ Full public API surface is visible in the package sources; the README examples s
 - **Angles/bearings**: bearings (for arc & circle generation) are interpreted in degrees (0..360). The bearing convention is clockwise from north.
 - **Altitude**: When you provide altitudes, the `AltitudeMode` is emitted (defaults to `.absolute` in most geometries).
 - **Styles**: `Style` generates a stable `id` when provided; otherwise a UUID-based id is generated. `ForeFlightKMLBuilder` will automatically register styles added via `Placemark`.
----
 
 ## Demo & tests
 
-The repo contains an `Example` app that demonstrates building shapes and the `Tests` folder with unit tests. Before publishing, ensure the example builds and the tests run in CI.
-
----
+The repo contains an `Example` app that demonstrates building shapes and the `Tests` folder with unit tests. 
 
 ## Contributing
 

Package.swift

@@ -0,0 +1,5 @@
+public enum KMZExportError: Error {
+    case kmzRequired
+    case missingLocalResource(String)
+    case archiveCreationFailed
+}

README.md

@@ -97,7 +97,7 @@ extension ForeFlightKMLBuilder {
         return addPlacemark(placemark)
     }
 
-    /// Add an arc segment line geometry.
+    /// Add an arc sector line geometry.
     /// - Parameters:
     ///   - name: Display name in ForeFlight (optional)
     ///   - center: Center point of the arc
@@ -110,7 +110,7 @@ extension ForeFlightKMLBuilder {
     ///   - style: Path style defining line appearance (optional)
     /// - Returns: Self for method chaining
     @discardableResult
-    public func addLineSegment(
+    public func addLineSector(
         name: String? = nil,
         center: Coordinate,
         radiusMeters: Double,
@@ -124,7 +124,7 @@ extension ForeFlightKMLBuilder {
         precondition(radiusMeters > 0, "Radius must be positive")
         precondition(numberOfPoints >= 3, "Need at least 3 segments for an arc")
 
-        let segment = LineSegment(
+        let sector = LineSector(
             center: center,
             radius: radiusMeters,
             startAngle: startAngle,
@@ -134,7 +134,7 @@ extension ForeFlightKMLBuilder {
             tessellate: tessellate
         )
 
-        let placemark = Placemark(name: name, geometry: segment, style: style)
+        let placemark = Placemark(name: name, geometry: sector, style: style)
         return addPlacemark(placemark)
     }
 
@@ -205,7 +205,7 @@ extension ForeFlightKMLBuilder {
         return addPlacemark(placemark)
     }
 
-    /// Add a filled segment polygon (pie slice).
+    /// Add a filled sector polygon (pie slice).
     /// - Parameters:
     ///   - name: Display name in ForeFlight (optional)
     ///   - center: Center point of the arc
@@ -218,7 +218,7 @@ extension ForeFlightKMLBuilder {
     ///   - style: Polygon style defining outline and optional fill (optional)
     /// - Returns: Self for method chaining
     @discardableResult
-    public func addPolygonSegment(
+    public func addPolygonSector(
         name: String? = nil,
         center: Coordinate,
         radiusMeters: Double,
@@ -232,7 +232,7 @@ extension ForeFlightKMLBuilder {
         precondition(radiusMeters > 0, "Radius must be positive")
         precondition(numberOfPoints >= 3, "Need at least 3 segments for a segment")
 
-        let segment = PolygonSegment(
+        let sector = PolygonSector(
             center: center,
             radius: radiusMeters,
             startAngle: startAngle,
@@ -242,15 +242,15 @@ extension ForeFlightKMLBuilder {
             tessellate: tessellate
         )
 
-        let placemark = Placemark(name: name, geometry: segment, style: style)
+        let placemark = Placemark(name: name, geometry: sector, style: style)
         return addPlacemark(placemark)
     }
 
-    /// Add a filled annular (ring) segment polygon.
-    /// This creates a segment between two radii, excluding the inner circle area.
+    /// Add a filled annular (ring) sector polygon.
+    /// This creates a sector between two radii, excluding the inner circle area.
     /// - Parameters:
     ///   - name: Display name in ForeFlight (optional)
-    ///   - center: Center point of the segment
+    ///   - center: Center point of the sector
     ///   - innerRadius: Inner radius in meters (the "hole" size)
     ///   - outerRadius: Outer radius in meters
     ///   - startAngle: Starting angle in degrees (0° = North, clockwise)
@@ -261,7 +261,7 @@ extension ForeFlightKMLBuilder {
     ///   - style: Polygon style defining outline and optional fill (optional)
     /// - Returns: Self for method chaining
     @discardableResult
-    public func addPolygonAnnularSegment(
+    public func addPolygonAnnularSector(
         name: String? = nil,
         center: Coordinate,
         innerRadius: Double,
@@ -277,7 +277,7 @@ extension ForeFlightKMLBuilder {
         precondition(outerRadius > innerRadius, "Outer radius must be greater than inner radius")
         precondition(numberOfPoints >= 3, "Need at least 3 segments for an annular segment")
 
-        let segment = PolygonAnnularSegment(
+        let sector = PolygonAnnularSector(
             center: center,
             innerRadius: innerRadius,
             outerRadius: outerRadius,
@@ -288,7 +288,32 @@ extension ForeFlightKMLBuilder {
             tessellate: tessellate
         )
 
-        let placemark = Placemark(name: name, geometry: segment, style: style)
+        let placemark = Placemark(name: name, geometry: sector, style: style)
         return addPlacemark(placemark)
     }
+
+    /// Add a text-only label placemark at a coordinate.
+    /// This uses a transparent 1×1 icon to enable ForeFlight’s “badge” rendering, with the badge color driven by `IconStyle.color`.
+    /// - Important: Because this relies on a local icon asset, the output **must be exported as KMZ** (not plain KML) for the label to render correctly.
+    /// - Parameters:
+    ///   - text: Label text displayed in ForeFlight
+    ///   - coordinate: Geographic coordinate
+    ///   - altitude: Altitude in meters (optional)
+    ///   - color: Badge/background color for the label (default: white)
+    /// - Returns: Self for method chaining
+    @discardableResult
+    public func addLabel(
+        _ text: String,
+        coordinate: Coordinate,
+        altitude: Double? = nil,
+        color: KMLColor = .white
+    ) -> Self {
+        addPoint(
+            name: text,
+            coordinate: coordinate,
+            altitude: altitude,
+            style: .labelBadge(color: color)
+        )
+    }
+
 }

Sources/ForeFlightKML/Errors/KMZExportError.swift

@@ -47,12 +47,21 @@ public final class ForeFlightKMLBuilder {
         return self
     }
 
+    /// True if this document must be exported as KMZ to render correctly.
+    public var requiresKMZ: Bool {
+        styleManager.requiresKMZ
+    }
+
     // MARK: - Build Methods
 
     /// Generate the complete KML string for this document.
     /// This method can be called multiple times - it doesn't modify the builder state.
     /// - Returns: A complete KML document as a UTF-8 string ready for export to ForeFlight
-    public func build() -> String {
+    public func build() throws -> String {
+        guard !requiresKMZ else {
+            throw KMZExportError.kmzRequired
+        }
+
         return kmlString()
     }