Change camera controller

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// Copyright 2023 Esri
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//   https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

import ArcGIS
import SwiftUI

struct ChangeCameraControllerView: View {
    /// A scene with imagery basemap style and a tiled elevation source.
    @State private var scene: ArcGIS.Scene = {
        // Creates a scene.
        let scene = Scene(basemapStyle: .arcGISImageryStandard)

        // Sets the initial viewpoint of the scene.
        scene.initialViewpoint = Viewpoint(
            latitude: .nan,
            longitude: .nan,
            scale: .nan,
            camera: Camera(
                lookingAt: Point(
                    x: -109.937516,
                    y: 38.456714,
                    spatialReference: .wgs84
                ),
                distance: 5500,
                heading: 150,
                pitch: 20,
                roll: 0
            )
        )

        // Creates a surface.
        let surface = Surface()

        // Creates a tiled elevation source.
        let worldElevationServiceURL = URL(
            string: "https://elevation3d.arcgis.com/arcgis/rest/services/WorldElevation3D/Terrain3D/ImageServer"
        )!
        let elevationSource = ArcGISTiledElevationSource(url: worldElevationServiceURL)

        // Adds the elevation source to the surface.
        surface.addElevationSource(elevationSource)

        // Sets the surface to the scene's base surface.
        scene.baseSurface = surface
        return scene
    }()

    /// A graphics overlay containing an airplane graphic.
    @State private var graphicsOverlay: GraphicsOverlay = {
        let planePosition = Point(x: -109.937516, y: 38.456714, z: 5000, spatialReference: .wgs84)
        let planeSymbol = ModelSceneSymbol(url: .bristol, scale: 100)
        let planeGraphic = Graphic(geometry: planePosition, symbol: planeSymbol)
        let graphicsOverlay = GraphicsOverlay(graphics: [planeGraphic])
        graphicsOverlay.sceneProperties.surfacePlacement = .absolute
        return graphicsOverlay
    }()

    /// The camera controller kind of the scene view.
    @State private var cameraControllerKind: CameraControllerKind = .globe

    private enum CameraControllerKind: CaseIterable {
        case globe
        case plane
        case crater

        /// A human-readable label for the camera controller kind.
        var label: String {
            switch self {
            case .globe: return "Pan Around Globe"
            case .plane: return "Orbit Around Plane"
            case .crater: return "Orbit Around Crater"
            }
        }
    }

    /// The camera controller of the scene view.
    @State private var cameraController: CameraController = GlobeCameraController()

    var body: some View {
        SceneView(
            scene: scene,
            cameraController: cameraController,
            graphicsOverlays: [graphicsOverlay]
        )
        .toolbar {
            ToolbarItem(placement: .bottomBar) {
                Picker("Camera Controller", selection: $cameraControllerKind) {
                    ForEach(CameraControllerKind.allCases, id: \.self) { kind in
                        Text(kind.label)
                    }
                }
                .task(id: cameraControllerKind) {
                    cameraController = makeCameraController(kind: cameraControllerKind)
                }
            }
        }
    }

    /// Creates a camera controller with the given kind of camera controller.
    /// - Parameter kind: The camera controller kind.
    /// - Returns: A camera controller.
    private func makeCameraController(kind: CameraControllerKind) -> CameraController {
        switch kind {
        case .crater:
            let targetLocation = Point(
                x: -109.929589,
                y: 38.437304,
                z: 1700,
                spatialReference: .wgs84
            )
            let cameraController = OrbitLocationCameraController(
                target: targetLocation,
                distance: 5000
            )
            cameraController.cameraPitchOffset = 3
            cameraController.cameraHeadingOffset = 150
            return cameraController
        case .plane:
            let targetGraphic = graphicsOverlay.graphics.first!
            let cameraController = OrbitGeoElementCameraController(
                target: targetGraphic,
                distance: 5000
            )
            cameraController.cameraPitchOffset = 30
            cameraController.cameraHeadingOffset = 150
            return cameraController
        case .globe:
            return GlobeCameraController()
        }
    }
}

private extension URL {
    static var bristol: URL { Bundle.main.url(forResource: "Bristol", withExtension: "dae", subdirectory: "Bristol")! }
}