Display scene

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// Copyright 2022 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 SwiftUI
import ArcGIS

struct DisplaySceneView: View {
    /// A scene with imagery basemap style and a tiled elevation source.
    @StateObject private var scene = makeScene()

    /// Makes a scene.
    private static func makeScene() -> ArcGIS.Scene {
        // Creates a scene.
        let scene = Scene(basemapStyle: .arcGISImageryStandard)

        // Sets the initial viewpoint of the scene.
        scene.initialViewpoint = Viewpoint(
            latitude: 45.74,
            longitude: 6.88,
            scale: 4_500,
            camera: Camera(
                latitude: 45.74,
                longitude: 6.88,
                altitude: 4500,
                heading: 10,
                pitch: 70,
                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
    }

    var body: some View {
        // Creates a scene view with the scene.
        SceneView(scene: scene)
    }
}