Set spatial reference

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// Copyright 2024 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 SetSpatialReferenceView: View {
    /// A map with spatial reference and a basemap.
    @State private var map: Map = {
        let map = Map(spatialReference: .worldBonne)
        map.basemap = Basemap(
            baseLayer: ArcGISMapImageLayer(url: .worldCities)
        )
        return map
    }()
    /// The currently selected spatial reference.
    @State private var selectedSpatialReference: SpatialReference = .worldBonne

    var body: some View {
        MapView(map: map)
            .toolbar {
                ToolbarItem(placement: .bottomBar) {
                    Picker("Spatial Reference", selection: $selectedSpatialReference) {
                        ForEach(SpatialReference.allOptions, id: \.wkid) { spatialReference in
                            Text(spatialReference.name)
                                .tag(spatialReference)
                        }
                    }
                    .onChange(of: selectedSpatialReference) {
                        map.setSpatialReference(selectedSpatialReference)
                    }
                    .fixedSize()
                }
            }
    }
}

private extension URL {
    /// The URL to the World Cities map service for the map image layer.
    static var worldCities: URL {
        URL(string: "https://sampleserver6.arcgisonline.com/arcgis/rest/services/SampleWorldCities/MapServer")!
    }
}

// MARK: - Spatial References

private extension SpatialReference {
    /// A human-readable name for the spatial reference.
    var name: String {
        switch self {
        case .berghausStar:
            "Berghaus Star AAG"
        case .fuller:
            "Fuller"
        case .newZealandMapGrid:
            "New Zealand Map Grid"
        case .northPoleStereographic:
            "North Pole Stereographic"
        case .peirceQuincuncial:
            "Peirce Quincuncial"
        case .utmZone10N:
            "UTM Zone 10 N"
        case .worldBonne:
            "World Bonne"
        case .worldOrthographic:
            "World Orthographic"
        case .worldGoodeHomolosine:
            "World Goode Homolosine"
        case .webMercator:
            "Web Mercator"
        case .wgs84:
            "WGS 84"
        default:
            "Unknown"
        }
    }

    /// Berghaus Star AAG (WKID: 102299).
    static var berghausStar: SpatialReference {
        SpatialReference(wkid: WKID(102299)!)!
    }
    /// Fuller (WKID: 54050).
    static var fuller: SpatialReference {
        SpatialReference(wkid: WKID(54050)!)!
    }
    /// New Zealand Map Grid (WKID: 27200).
    static var newZealandMapGrid: SpatialReference {
        SpatialReference(wkid: WKID(27200)!)!
    }
    /// North Pole Stereographic (WKID: 102018).
    static var northPoleStereographic: SpatialReference {
        SpatialReference(wkid: WKID(102018)!)!
    }
    /// Peirce quincuncial North Pole in a square (WKID: 54090).
    static var peirceQuincuncial: SpatialReference {
        SpatialReference(wkid: WKID(54090)!)!
    }
    /// UTM Zone 10 N (WKID: 32610).
    static var utmZone10N: SpatialReference {
        SpatialReference(wkid: WKID(32610)!)!
    }
    /// World Bonne (WKID: 54024).
    static var worldBonne: SpatialReference {
        SpatialReference(wkid: WKID(54024)!)!
    }
    /// World Goode Homolosine Land (WKID: 54052).
    static var worldGoodeHomolosine: SpatialReference {
        SpatialReference(wkid: WKID(54052)!)!
    }
    /// Orthographic projection of the World from Space (WKID: 102038).
    static var worldOrthographic: SpatialReference {
        SpatialReference(wkid: WKID(102038)!)!
    }

    /// All available spatial references for selection.
    static var allOptions: [SpatialReference] {
        return [
            .berghausStar,
            .fuller,
            .newZealandMapGrid,
            .northPoleStereographic,
            .peirceQuincuncial,
            .utmZone10N,
            .worldBonne,
            .worldGoodeHomolosine,
            .worldOrthographic,
            .webMercator,
            .wgs84
        ]
    }
}

#Preview {
    SetSpatialReferenceView()
}