Show viewshed from geoelement in scene

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 // 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 ShowViewshedFromGeoelementInSceneView: View {  /// The view model for the sample.  @StateObject private var model = Model()   /// A timer to trigger waypoint movement animation.  let timer = Timer.publish(every: 0.1, on: .main, in: .common).autoconnect()   var body: some View {  SceneView(  scene: model.scene,  cameraController: model.cameraController,  graphicsOverlays: [model.graphicsOverlay],  analysisOverlays: [model.analysisOverlay]  )  .onSingleTapGesture { _, scenePoint in  // Move the tank to the scene point on a screen tap.  guard let scenePoint else { return }  model.waypoint = scenePoint  }  .onReceive(timer) { _ in  // Use a timer to animate the tank moving towards the new waypoint.  if model.waypoint != nil {  model.animate()  }  }  .overlay(alignment: .top) {  // Instruction text.  Text("Tap on the map to move the tank and update the viewshed.")  .padding(8)  .frame(maxWidth: .infinity, alignment: .leading)  .background(.thinMaterial, ignoresSafeAreaEdges: .horizontal)  }  } }  private extension ShowViewshedFromGeoelementInSceneView {  /// The view model for the sample.  class Model: ObservableObject {  /// A scene with an imagery basemap.  let scene: ArcGIS.Scene = {  let scene = Scene(basemapStyle: .arcGISImagery)   // Add elevation source to the base surface of the scene with the service URL.  let elevationSource = ArcGISTiledElevationSource(url: .worldElevationService)  scene.baseSurface.addElevationSource(elevationSource)   // Create the building layer and add it to the scene.  let buildingsLayer = ArcGISSceneLayer(url: .brestBuildingsService)  scene.addOperationalLayer(buildingsLayer)   return scene  }()   /// A camera controller set to follow the tank.  let cameraController: CameraController   /// The graphics overlay for the tank graphic.  let graphicsOverlay: GraphicsOverlay = {  let graphicsOverlay = GraphicsOverlay()  graphicsOverlay.sceneProperties = LayerSceneProperties(surfacePlacement: .relative)   // Set up the heading expression for the tank.  let renderer3D = SimpleRenderer()  let sceneProperties = RendererSceneProperties(  headingExpression: "[heading]",  pitchExpression: "[pitch]",  rollExpression: "[roll]"  )  renderer3D.sceneProperties = sceneProperties  graphicsOverlay.renderer = renderer3D   return graphicsOverlay  }()   /// The analysis overlay for the tank's viewshed.  let analysisOverlay = AnalysisOverlay()   /// The graphic for the tank.  private let tankGraphic: Graphic = {  let tankSymbol = ModelSceneSymbol(url: .bradleyTank, scale: 10)  tankSymbol.heading = 90  tankSymbol.anchorPosition = .bottom  let tankGraphic = Graphic(  geometry: Point(latitude: 48.385624, longitude: -4.506390),  attributes: ["heading": 0.0],  symbol: tankSymbol  )  return tankGraphic  }()   /// The point for the tank to move toward.  var waypoint: Point?   init() {  // Create camera controller.  cameraController = OrbitGeoElementCameraController(  target: tankGraphic,  distance: 200  )   // Add tank graphic to graphics overlay.  graphicsOverlay.addGraphic(tankGraphic)   // Create a viewshed to attach to the tank.  let geoElementViewshed = GeoElementViewshed(  geoElement: tankGraphic,  horizontalAngle: 90,  verticalAngle: 40,  headingOffset: 0,  pitchOffset: 0,  minDistance: 0.1,  maxDistance: 250  )   // Offset viewshed observer location to top of tank.  geoElementViewshed.offsetZ = 3   // Add the viewshed to the analysisOverlay to add to the scene.  analysisOverlay.addAnalysis(geoElementViewshed)  }   /// Animates the tank moving from its current point to the waypoint.  func animate() {  // Get point from the current tank position.  guard let tankLocation = tankGraphic.geometry as? Point,  let point = waypoint else { return }   // Get the distance from the current tank location to the waypoint.  guard let distanceResult = GeometryEngine.geodeticDistance(  from: tankLocation,  to: point,  distanceUnit: .meters,  azimuthUnit: .degrees,  curveType: .geodesic  ) else { return }   // Move toward waypoint a short distance.  let locations = GeometryEngine.geodeticMove(  [tankLocation],  distance: 1,  distanceUnit: .meters,  azimuth: distanceResult.azimuth1.value,  azimuthUnit: distanceResult.azimuth1.unit.angularUnit,  curveType: .geodesic  )  tankGraphic.geometry = locations.first   // Set tank graphic heading.  if let heading = tankGraphic.attributes["heading"] as? Double {  // Divide by 10 to make the animation more smooth.  tankGraphic.setAttributeValue(  heading + ((distanceResult.azimuth1.value - heading) / 10),  forKey: "heading"  )  }   // Reset waypoint to stop animation when within 5 meters of the waypoint.  if distanceResult.distance.value <= 5 {  waypoint = nil  }  }  } }  private extension URL {  /// The on-demand resource URL for the Bradley tank.  static var bradleyTank: URL {  Bundle.main.url(forResource: "bradle", withExtension: "3ds", subdirectory: "bradley_low_3ds")!  }   /// A world elevation service from Terrain3D ArcGIS REST service.  static var worldElevationService: URL {  URL(string: "https://elevation3d.arcgis.com/arcgis/rest/services/WorldElevation3D/Terrain3D/ImageServer")!  }   /// A scene service URL for buildings in Brest, France.  static var brestBuildingsService: URL {  URL(string: "https://tiles.arcgis.com/tiles/P3ePLMYs2RVChkJx/arcgis/rest/services/Buildings_Brest/SceneServer/layers/0")!  } }