Find service area

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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 // Copyright 2018 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: http://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.  using Esri.ArcGISRuntime.Geometry; using Esri.ArcGISRuntime.Mapping; using Esri.ArcGISRuntime.Symbology; using Esri.ArcGISRuntime.Tasks.NetworkAnalysis; using Esri.ArcGISRuntime.UI; using Esri.ArcGISRuntime.UI.Editing; using System; using System.Collections.Generic; using System.Linq; using System.Windows;  namespace ArcGIS.WPF.Samples.FindServiceArea {  [ArcGIS.Samples.Shared.Attributes.Sample(  name: "Find service area",  category: "Network analysis",  description: "Find the service area within a network from a given point.",  instructions: "In order to find any service areas at least one facility needs to be added to the map view.",  tags: new[] { "barriers", "facilities", "geometry editor", "impedance", "logistics", "routing" })]  public partial class FindServiceArea  {  // Uri for the service area around San Diego.  private Uri _serviceAreaUri = new Uri("https://sampleserver6.arcgisonline.com/arcgis/rest/services/NetworkAnalysis/SanDiego/NAServer/ServiceArea");   // Hold a reference to the geometry type used in the geometry editor.  private GeometryType _geometryType;   public FindServiceArea()  {  InitializeComponent();   // Create the map, graphics overlay, and geometry editor.  Initialize();  }   private void Initialize()  {  // Center the map on San Diego.  Map streetsMap = new Map(BasemapStyle.ArcGISLightGray)  {  InitialViewpoint = new Viewpoint(32.73, -117.14, 30000)  };  MyMapView.Map = streetsMap;   // Create graphics overlays for all of the elements of the map.  MyMapView.GraphicsOverlays.Add(new GraphicsOverlay());   MyMapView.GeoViewDoubleTapped += (s, e) =>  {  // Finish any barrier.  if (MyMapView.GeometryEditor.IsStarted && _geometryType == GeometryType.Polyline)  {  FinishBarrier();  }  };  }   private void PlaceFacilityButton_Click(object sender, RoutedEventArgs e)  {  try  {  // Let the user tap on the map view using the point geometry type.  _geometryType = GeometryType.Point;   MyMapView.GeometryEditor.Start(_geometryType);  MyMapView.GeometryEditor.PropertyChanged += GeometryEditor_PropertyChanged;  }  catch (Exception ex)  {  // Report exceptions.  MessageBox.Show("Error drawing facility:\n" + ex.Message);  }  }   private void GeometryEditor_PropertyChanged(object sender, System.ComponentModel.PropertyChangedEventArgs e)  {  if (e.PropertyName == nameof(GeometryEditor.Geometry) && _geometryType == GeometryType.Point)  {  // Disconnect event handler to prevent multiple calls.  MyMapView.GeometryEditor.PropertyChanged -= GeometryEditor_PropertyChanged;   // Get the active geometry.  Geometry geometry = MyMapView.GeometryEditor.Geometry;   // Symbology for a facility.  PictureMarkerSymbol facilitySymbol = new PictureMarkerSymbol(new Uri("https://static.arcgis.com/images/Symbols/SafetyHealth/Hospital.png"))  {  Height = 30,  Width = 30  };   // Create a graphic for the facility.  Graphic facilityGraphic = new Graphic(geometry, new Dictionary<string, object>() { { "Type", "Facility" } }, facilitySymbol)  {  ZIndex = 2  };   // Add the graphic to the graphics overlay.  MyMapView.GraphicsOverlays[0].Graphics.Add(facilityGraphic);   // Stop the geometry editor to clear the active geometry.  MyMapView.GeometryEditor.Stop();  }  }   private void DrawBarrierButton_Click(object sender, RoutedEventArgs e)  {  // Finish the drawing if already started.  if ((string)DrawBarrierButton.Content != "Draw barrier")  {  if (MyMapView.GeometryEditor.IsStarted)  {  FinishBarrier();  }  DrawBarrierButton.Content = "Draw barrier";  return;  }  try  {  // Update the button title.  DrawBarrierButton.Content = "Finish barrier";   // Let the user draw on the map view using the polyline geometry type.  _geometryType = GeometryType.Polyline;   MyMapView.GeometryEditor.Start(_geometryType);  }  catch (Exception ex)  {  // Report exceptions.  MessageBox.Show("Error drawing barrier:\n" + ex.Message);  }  }   private void FinishBarrier()  {  Geometry geometry = MyMapView.GeometryEditor.Stop();   if (!geometry.IsEmpty)  {  // Symbol for the barriers.  SimpleLineSymbol barrierSymbol = new SimpleLineSymbol(SimpleLineSymbolStyle.Solid, System.Drawing.Color.Black, 5.0f);   // Create the graphic to be used for barriers.  Graphic barrierGraphic = new Graphic(geometry, new Dictionary<string, object>() { { "Type", "Barrier" } }, barrierSymbol)  {  ZIndex = 1  };   // Add a graphic from the polyline the user drew.  MyMapView.GraphicsOverlays[0].Graphics.Add(barrierGraphic);   // Update button text.  DrawBarrierButton.Content = "Draw barrier";  }  }   private async void ShowServiceAreasButton_Click(object sender, RoutedEventArgs e)  {  // Finish any drawings.  if (MyMapView.GeometryEditor.IsStarted)  {  FinishBarrier();  }   // Use a local variable for the graphics overlay.  GraphicCollection allGraphics = MyMapView.GraphicsOverlays[0].Graphics;   // Get a list of the facilities from the graphics overlay.  List<ServiceAreaFacility> serviceAreaFacilities = (from g in allGraphics  where (string)g.Attributes["Type"] == "Facility"  select new ServiceAreaFacility((MapPoint)g.Geometry)).ToList();   // Check that there is at least 1 facility to find a service area for.  if (!serviceAreaFacilities.Any())  {  MessageBox.Show("Must have at least one Facility!", "Sample error");  return;  }   // Create the service area task and parameters based on the Uri.  ServiceAreaTask serviceAreaTask = await ServiceAreaTask.CreateAsync(_serviceAreaUri);   // Store the default parameters for the service area in an object.  ServiceAreaParameters serviceAreaParameters = await serviceAreaTask.CreateDefaultParametersAsync();   // Add impedance cutoffs for facilities (drive time minutes).  serviceAreaParameters.DefaultImpedanceCutoffs.Add(2.0);  serviceAreaParameters.DefaultImpedanceCutoffs.Add(5.0);   // Set the level of detail for the polygons.  serviceAreaParameters.PolygonDetail = ServiceAreaPolygonDetail.High;   // Get a list of the barriers from the graphics overlay.  List<PolylineBarrier> polylineBarriers = (from g in allGraphics  where (string)g.Attributes["Type"] == "Barrier"  select new PolylineBarrier((Polyline)g.Geometry)).ToList();   // Add the barriers to the service area parameters.  serviceAreaParameters.SetPolylineBarriers(polylineBarriers);   // Update the parameters to include all of the placed facilities.  serviceAreaParameters.SetFacilities(serviceAreaFacilities);   // Clear existing graphics for service areas.  foreach (Graphic g in allGraphics.ToList())  {  // Check if the graphic g is a service area.  if ((string)g.Attributes["Type"] == "ServiceArea")  {  allGraphics.Remove(g);  }  }   try  {  // Solve for the service area of the facilities.  ServiceAreaResult result = await serviceAreaTask.SolveServiceAreaAsync(serviceAreaParameters);   // Loop over each facility.  for (int i = 0; i < serviceAreaFacilities.Count; i++)  {  // Create list of polygons from a service facility.  List<ServiceAreaPolygon> polygons = result.GetResultPolygons(i).ToList();   // Symbol for the outline of the service areas.  SimpleLineSymbol serviceOutline = new SimpleLineSymbol(SimpleLineSymbolStyle.Solid, System.Drawing.Color.DarkGray, 3.0f);   // Create a list of fill symbols for the polygons.  List<SimpleFillSymbol> fillSymbols = new List<SimpleFillSymbol>();  fillSymbols.Add(new SimpleFillSymbol(SimpleFillSymbolStyle.Solid, System.Drawing.Color.FromArgb(70, 255, 0, 0), serviceOutline));  fillSymbols.Add(new SimpleFillSymbol(SimpleFillSymbolStyle.Solid, System.Drawing.Color.FromArgb(70, 255, 165, 0), serviceOutline));   // Loop over every polygon in every facilities result.  for (int j = 0; j < polygons.Count; j++)  {  // Create the graphic for the service areas, alternating between fill symbols.  Graphic serviceGraphic = new Graphic(polygons[j].Geometry, new Dictionary<string, object>() { { "Type", "ServiceArea" } }, fillSymbols[j % 2])  {  ZIndex = 0  };   // Add graphic for service area. Alternate the color of each polygon.  allGraphics.Add(serviceGraphic);  }  }  }  catch (Esri.ArcGISRuntime.Http.ArcGISWebException exception)  {  if (exception.Message.ToString().Equals("Unable to complete operation."))  {  MessageBox.Show("Facility not within San Diego area!", "Sample error");  }  else  {  MessageBox.Show("An ArcGIS web exception occurred. \n" + exception.Message.ToString(), "Sample error");  }  }  }   private void Reset_Click(object sender, RoutedEventArgs e)  {  // Clear all of the graphics.  MyMapView.GraphicsOverlays[0].Graphics.Clear();  }  } }