Show utility associations

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 // 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 ShowUtilityAssociationsView: View {  /// The view model for the sample.  @StateObject private var model = Model()   /// The current viewpoint of the map.  @State private var viewpoint: Viewpoint = .initialViewpoint   /// The scale of the viewpoint.  @State private var scale: Double = .zero   /// An image that represents an attachment symbol.  @State private var attachmentImage: UIImage?   /// An image that represents a connectivity symbol.  @State private var connectivityImage: UIImage?   /// The display scale of this environment.  @Environment(\.displayScale) private var displayScale   var body: some View {  MapView(  map: model.map,  viewpoint: viewpoint,  graphicsOverlays: [model.associationsOverlay]  )  .onScaleChanged {  scale = $0  Task { try await model.addAssociationGraphics(viewpoint: viewpoint, scale: scale) }  }  .onViewpointChanged(kind: .boundingGeometry) {  viewpoint = $0  Task { try await model.addAssociationGraphics(viewpoint: viewpoint, scale: scale) }  }  .task {  try? await model.setup()  try? await model.addAssociationGraphics(viewpoint: viewpoint, scale: scale)  }  .overlay(alignment: .topLeading) {  legend  .padding()  .background(.thinMaterial)  .clipShape(.rect(cornerRadius: 10))  .shadow(radius: 3)  .padding()  }  .onTeardown {  model.tearDown()  }  } }  private extension ShowUtilityAssociationsView {  /// The legend for the utility associations.  var legend: some View {  VStack {  Label {  Text("Attachment")  } icon: {  if let attachmentImage {  Image(uiImage: attachmentImage)  } else {  Color.clear  }  }  .task(id: displayScale) {  attachmentImage = try? await Symbol.attachment  .makeSwatch(scale: displayScale)  }  Label {  Text("Connectivity")  } icon: {  if let connectivityImage {  Image(uiImage: connectivityImage)  } else {  Color.clear  }  }  .task(id: displayScale) {  connectivityImage = try? await Symbol.connectivity  .makeSwatch(scale: displayScale)  }  }  .labelStyle(.titleAndIcon)  } }  private extension ShowUtilityAssociationsView {  /// The model used to store the geo model and other expensive objects  /// used in this view.  @MainActor  class Model: ObservableObject {  // MARK: Properties   /// The map with the utility network.  let map = Map(item: .napervilleElectricNetwork())   /// The utility network for this sample.  private var network: UtilityNetwork { map.utilityNetworks.first! }   /// A container for associations results.  let associationsOverlay = makeAssociationsOverlay()   /// A Boolean value indicating if the sample is authenticated.  private var isAuthenticated: Bool {  !ArcGISEnvironment.authenticationManager.arcGISCredentialStore.credentials.isEmpty  }   /// A Boolean value indicating if graphics are being added to the associations overlay.  private var isAddingGraphics = false   /// The max scale for the viewpoint.  private var maxScale: Double { 2_000 }   init() {  // Updates the URL session challenge handler to use the  // specified credentials and tokens for any challenges.  ArcGISEnvironment.authenticationManager.arcGISAuthenticationChallengeHandler = ChallengeHandler()  }   // MARK: Methods   /// Loads the map and the utility network.  func setup() async throws {  try await map.load()  try await network.load()  }   /// Cleans up the model's setup.  func tearDown() {  // Resets the URL session challenge handler to use default handling  // and removes all credentials.  ArcGISEnvironment.authenticationManager.arcGISAuthenticationChallengeHandler = nil  ArcGISEnvironment.authenticationManager.arcGISCredentialStore.removeAll()  }   static func makeAssociationsOverlay() -> GraphicsOverlay {  let attachmentValue = UniqueValue(  description: "Attachment",  label: "",  symbol: .attachment,  values: [UtilityAssociation.Kind.attachment]  )  let connectivityValue = UniqueValue(  description: "Connectivity",  label: "",  symbol: .connectivity,  values: [UtilityAssociation.Kind.connectivity]  )   let renderer = UniqueValueRenderer(  fieldNames: ["AssociationType"],  uniqueValues: [attachmentValue, connectivityValue],  defaultLabel: ""  )   let overlay = GraphicsOverlay()  overlay.renderer = renderer  return overlay  }   func addAssociationGraphics(viewpoint: Viewpoint, scale: Double) async throws {  // Check if the current viewpoint is outside of the max scale.  guard isAuthenticated, scale <= maxScale, !isAddingGraphics else { return }  isAddingGraphics = true  let extent = viewpoint.targetGeometry.extent  // Get all of the associations in extent of the viewpoint.  let associations = try await network.associations(forExtent: extent)  let existingAssociationIDs = Set(  associationsOverlay.graphics.compactMap { $0.attributes["GlobalId"] as? UUID }  )  let graphics: [Graphic] = associations  .compactMap { association in  let associationID = association.globalID  guard !existingAssociationIDs.contains(associationID),  let symbol = symbol(for: association.kind) else { return nil }   return Graphic(  geometry: association.geometry,  attributes: [  "GlobalId": associationID,  "AssociationType": association.kind  ],  symbol: symbol  )  }  associationsOverlay.addGraphics(graphics)  isAddingGraphics = false  }   func symbol(for associationKind: UtilityAssociation.Kind) -> Symbol? {  switch associationKind {  case .attachment:  return Symbol.attachment  case .connectivity:  return Symbol.connectivity  default:  return nil  }  }  } }  private extension Symbol {  /// A green dot.  static var attachment: LineSymbol {  SimpleLineSymbol(style: .dot, color: .green, width: 5)  }   /// A red dot.  static var connectivity: LineSymbol {  SimpleLineSymbol(style: .dot, color: .red, width: 5)  } }  private extension Item {  /// A web map portal item for the Naperville Electric Map.  static func napervilleElectricNetwork() -> PortalItem {  PortalItem(  // Sample server 7 authentication required.  portal: Portal(  url: URL(string: "https://sampleserver7.arcgisonline.com/portal")!,  connection: .authenticated  ),  id: .init("be0e4637620a453584118107931f718b")!  )  } }  /// The authentication model used to handle challenges and credentials. private struct ChallengeHandler: ArcGISAuthenticationChallengeHandler {  func handleArcGISAuthenticationChallenge(  _ challenge: ArcGISAuthenticationChallenge  ) async throws -> ArcGISAuthenticationChallenge.Disposition {  // NOTE: Never hardcode login information in a production application.  // This is done solely for the sake of the sample.  return .continueWithCredential(  // Credentials for sample server 7 services.  try await TokenCredential.credential(for: challenge, username: "viewer01", password: "I68VGU^nMurF")  )  } }  private extension Viewpoint {  /// The initial viewpoint to be displayed when the sample is first opened.  static var initialViewpoint: Viewpoint {  .init(  latitude: 41.8057655,  longitude: -88.1489692,  scale: 70.5310735  )  } }  #Preview {  NavigationStack {  ShowUtilityAssociationsView()  } }