Render multilayer symbols

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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 // 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: 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.UI; using System; using System.Collections.Generic; using System.Drawing; using System.IO; using System.Linq; using System.Reflection;  namespace ArcGIS.WPF.Samples.RenderMultilayerSymbols {  [ArcGIS.Samples.Shared.Attributes.Sample(  name: "Render multilayer symbols",  category: "Symbology",  description: "Show different kinds of multilayer symbols on a map similar to some pre-defined 2D simple symbol styles.",  instructions: "The sample loads multilayer symbols for points, polylines, and polygons.",  tags: new[] { "graphic", "marker", "multilayer", "picture", "symbol" })]  public partial class RenderMultilayerSymbols  {  // This is used to keep consistent distance from each symbol on the column.  private double _offset = 20.0;   public RenderMultilayerSymbols()  {  InitializeComponent();  Initialize();  }   private void Initialize()  {  MyMapView.Map = new Map(BasemapStyle.ArcGISLightGray);  var overlay = new GraphicsOverlay();   var textGraphicForMarkers = new Graphic(new MapPoint(-150, 50, SpatialReferences.Wgs84),  new TextSymbol()  {  Text = "MultilayerPoint\nsimple markers",  Color = Color.Black,  BackgroundColor = Color.White,  Size = 20,  OutlineColor = Color.Black,  OutlineWidth = 1,  });  overlay.Graphics.Add(textGraphicForMarkers);   AddPointGraphicsWithMarkerSymbols(overlay);   var textGraphicForPictureMarkers = new Graphic(new MapPoint(-80, 50, SpatialReferences.Wgs84),  new TextSymbol()  {  Text = "MultilayerPoint\npicture markers",  Color = Color.Black,  BackgroundColor = Color.White,  Size = 20,  OutlineColor = Color.Black,  OutlineWidth = 1  });  overlay.Graphics.Add(textGraphicForPictureMarkers);   // Create picture marker symbol from a Uri.  AddPointGraphicsWithPictureMarkerSymbolFromUri(overlay);   // Create picture marker symbol from embedded resources.  AddPointGraphicsWithPictureMarkerSymbolFromResources(overlay);   var textGraphicForLineSymbols = new Graphic(new MapPoint(0, 50, SpatialReferences.Wgs84),  new TextSymbol()  {  Text = "Multilayer\nPolyline",  Color = Color.Black,  BackgroundColor = Color.White,  Size = 20,  OutlineColor = Color.Black,  OutlineWidth = 1  });  overlay.Graphics.Add(textGraphicForLineSymbols);   // Create the line marker symbols.  AddLineGraphicsWithMarkerSymbols(overlay);   var textGraphicForFillSymbols = new Graphic(new MapPoint(65, 50, SpatialReferences.Wgs84),  new TextSymbol()  {  Text = "Multilayer\nPolygon",  Color = Color.Black,  BackgroundColor = Color.White,  Size = 20,  OutlineColor = Color.Black,  OutlineWidth = 1  });  overlay.Graphics.Add(textGraphicForFillSymbols);   // Create the polygon marker symbol.  AddPolygonGraphicsWithMarkerSymbols(overlay);   var textGraphicForComplexSymbols = new Graphic(new MapPoint(130, 50, SpatialReferences.Wgs84),  new TextSymbol()  {  Text = "More Multilayer\nSymbols",  Color = Color.Black,  BackgroundColor = Color.White,  Size = 20,  OutlineColor = Color.Black,  OutlineWidth = 1  });  overlay.Graphics.Add(textGraphicForComplexSymbols);   // Create the more complex multilayer points, polygons, and polylines.  AddComplexPointGraphic(overlay);  AddComplexPolygonGraphic(overlay);  AddComplexPolylineGraphic(overlay);   MyMapView.GraphicsOverlays.Add(overlay);  }   #region Create a multilayer point symbol.   private void AddPointGraphicsWithMarkerSymbols(GraphicsOverlay overlay)  {  MultilayerPointSymbol markerSymbol;   // Define a vector element, a diamond in this case.  Geometry vectorElementGeometry = Geometry.FromJson("{\"rings\":[[[0.0,2.5],[2.5,0.0],[0.0,-2.5],[-2.5,0.0],[0.0,2.5]]]}");  var vectorElementFill = new SolidFillSymbolLayer(Color.Red);  var multiLayerPolygonSymbol = new MultilayerPolygonSymbol(new[] { vectorElementFill });  var vectorMarkerDiamond = new VectorMarkerSymbolElement(vectorElementGeometry, multiLayerPolygonSymbol);  var vectorMarkerSymbol = new VectorMarkerSymbolLayer(new[] { vectorMarkerDiamond });  markerSymbol = new MultilayerPointSymbol(new[] { vectorMarkerSymbol });   // Create point graphics using the diamond symbol created above.  var diamondGraphic = new Graphic(new MapPoint(-150, 20, SpatialReferences.Wgs84), markerSymbol);  overlay.Graphics.Add(diamondGraphic);   // Define a vector element, a triangle in this case.  vectorElementGeometry = Geometry.FromJson("{\"rings\":[[[0.0,5.0],[5,-5.0],[-5,-5.0],[0.0,5.0]]]}");  vectorElementFill = new SolidFillSymbolLayer(Color.Red);  multiLayerPolygonSymbol = new MultilayerPolygonSymbol(new[] { vectorElementFill });  var vectorMarkerTriangle = new VectorMarkerSymbolElement(vectorElementGeometry, multiLayerPolygonSymbol);  vectorMarkerSymbol = new VectorMarkerSymbolLayer(new[] { vectorMarkerTriangle });  markerSymbol = new MultilayerPointSymbol(new[] { vectorMarkerSymbol });   // Create point graphics using the triangle symbol created above.  var triangleGraphic = new Graphic(new MapPoint(-150, 20 - _offset, SpatialReferences.Wgs84), markerSymbol);  overlay.Graphics.Add(triangleGraphic);   // Define a vector element, a cross in this case.  vectorElementGeometry = Geometry.FromJson("{\"paths\":[[[-1,1],[0,0],[1,-1]],[[1,1],[0,0],[-1,-1]]]}");  var vectorElementStroke = new SolidStrokeSymbolLayer(1, Color.Red);  var multilayerPolylineSymbol = new MultilayerPolylineSymbol(new[] { vectorElementStroke });  var vectorMarkerX = new VectorMarkerSymbolElement(vectorElementGeometry, multilayerPolylineSymbol);  vectorMarkerSymbol = new VectorMarkerSymbolLayer(new[] { vectorMarkerX });  markerSymbol = new MultilayerPointSymbol(new[] { vectorMarkerSymbol });   // Create point graphics using the cross symbol created above.  var crossGraphic = new Graphic(new MapPoint(-150, 20 - 2 * _offset, SpatialReferences.Wgs84), markerSymbol);  overlay.Graphics.Add(crossGraphic);  }   #endregion Create a multilayer point symbol.   #region Create a picture marker symbol from a Uri.   private void AddPointGraphicsWithPictureMarkerSymbolFromUri(GraphicsOverlay overlay)  {  var symbolUri = new Uri("https://static.arcgis.com/images/Symbols/OutdoorRecreation/Camping.png");   // Create a new symbol using asynchronous factory method from Uri.  var campsiteMarker = new PictureMarkerSymbolLayer(symbolUri)  {  Size = 40  };  var campsiteSymbol = new MultilayerPointSymbol(new[] { campsiteMarker });   var campsitePoint = new MapPoint(-80, 20, SpatialReferences.Wgs84);   // Create graphic with the location and symbol.  var campsiteGraphic = new Graphic(campsitePoint, campsiteSymbol);  overlay.Graphics.Add(campsiteGraphic);  }   #endregion Create a picture marker symbol from a Uri.   #region Create a picture marker symbol from an embedded resource.   private void AddPointGraphicsWithPictureMarkerSymbolFromResources(GraphicsOverlay overlay)  {  // Get current assembly that contains the image.  Assembly currentAssembly = Assembly.GetExecutingAssembly();   // Get the resource name of the blue pin image  string resourceStreamName = this.GetType().Assembly.GetManifestResourceNames().Single(str => str.EndsWith("pin_star_blue.png"));   // Get image as a stream from the resources.  // Picture is defined as EmbeddedResource.  using (var stream = currentAssembly.GetManifestResourceStream(resourceStreamName))  {  using (var mem = new MemoryStream())  {  stream.CopyTo(mem);   // Create a runtime image from the bytes read from the memory stream.  var img = new RuntimeImage(mem.ToArray());   // Create new PictureMarkerSymbolLayer from the runtime image object.  var pinMarker = new PictureMarkerSymbolLayer(img) { Size = 50 };   // Create a new multilayerpoint symbol with the PictureMarkerSymbolLayer.  var pinSymbol = new MultilayerPointSymbol(new[] { pinMarker });   // Create location for the pin.  var pinPoint = new MapPoint(-80, 20 - _offset, SpatialReferences.Wgs84);   // Create graphic with the location and symbol.  var pinGraphic = new Graphic(pinPoint, pinSymbol);  overlay.Graphics.Add(pinGraphic);  }  }  }   #endregion Create a picture marker symbol from an embedded resource.   #region Create a multilayer polyline symbol.   private void AddLineGraphicsWithMarkerSymbols(GraphicsOverlay overlay)  {  // Multilayer polyline symbol for different line styles.  MultilayerPolylineSymbol lineSymbol;   // Stroke used by line symbols.  SolidStrokeSymbolLayer strokeLayer;  strokeLayer = new SolidStrokeSymbolLayer(3, Color.Red);  strokeLayer.CapStyle = StrokeSymbolLayerCapStyle.Round;   // Create a polyline for the multilayer polyline symbol.  var polylineBuilder = new PolylineBuilder(SpatialReferences.Wgs84);  polylineBuilder.AddPoint(new MapPoint(-30, 20, SpatialReferences.Wgs84));  polylineBuilder.AddPoint(new MapPoint(30, 20, SpatialReferences.Wgs84));   // Dash geometric effects that define the dash and dot template used by different line style.  var dashEffect = new DashGeometricEffect();   // Create a dash effect similar to SimpleLineSymbolStyle.ShortDashDotDot.  dashEffect.DashTemplate.Add(4);  dashEffect.DashTemplate.Add(6);  dashEffect.DashTemplate.Add(0.5);  dashEffect.DashTemplate.Add(6);  dashEffect.DashTemplate.Add(0.5);  dashEffect.DashTemplate.Add(6);  strokeLayer.GeometricEffects.Add(dashEffect);   lineSymbol = new MultilayerPolylineSymbol(new List<SymbolLayer> { strokeLayer });   // Create a polyline graphic with geometry using the symbol created above.  var shortDashDotGraphic = new Graphic(polylineBuilder.ToGeometry(), lineSymbol);  overlay.Graphics.Add(shortDashDotGraphic);   polylineBuilder = new PolylineBuilder(SpatialReferences.Wgs84);  polylineBuilder.AddPoint(new MapPoint(-30, 20 - _offset, SpatialReferences.Wgs84));  polylineBuilder.AddPoint(new MapPoint(30, 20 - _offset, SpatialReferences.Wgs84));   strokeLayer = new SolidStrokeSymbolLayer(3, Color.Red);  strokeLayer.CapStyle = StrokeSymbolLayerCapStyle.Round;  dashEffect = new DashGeometricEffect();   // Create a dash effect similar to SimpleLineSymbolStyle.ShortDash.  dashEffect.DashTemplate.Add(4);  dashEffect.DashTemplate.Add(6);  strokeLayer.GeometricEffects.Add(dashEffect);   lineSymbol = new MultilayerPolylineSymbol(new List<SymbolLayer> { strokeLayer });   // Create a polyline graphic with geometry using the symbol created above.  var shortDashGraphic = new Graphic(polylineBuilder.ToGeometry(), lineSymbol);  overlay.Graphics.Add(shortDashGraphic);   polylineBuilder = new PolylineBuilder(SpatialReferences.Wgs84);  polylineBuilder.AddPoint(new MapPoint(-30, 20 - 2 * _offset, SpatialReferences.Wgs84));  polylineBuilder.AddPoint(new MapPoint(30, 20 - 2 * _offset, SpatialReferences.Wgs84));   strokeLayer = new SolidStrokeSymbolLayer(3, Color.Red);  strokeLayer.CapStyle = StrokeSymbolLayerCapStyle.Round;  dashEffect = new DashGeometricEffect();   // Create a dash effect similar to SimpleLineSymbolStyle.DashDotDot.  dashEffect.DashTemplate.Add(7);  dashEffect.DashTemplate.Add(9);  dashEffect.DashTemplate.Add(0.5);  dashEffect.DashTemplate.Add(9);  strokeLayer.GeometricEffects.Add(dashEffect);   lineSymbol = new MultilayerPolylineSymbol(new List<SymbolLayer> { strokeLayer });   // Create a polyline graphic with geometry using the symbol created above.  var dashDotGraphic = new Graphic(polylineBuilder.ToGeometry(), lineSymbol);  overlay.Graphics.Add(dashDotGraphic);  }   #endregion Create a multilayer polyline symbol.   #region Create a multilayer polygon symbol.   private void AddPolygonGraphicsWithMarkerSymbols(GraphicsOverlay overlay)  {  var polygonBuilder = new PolygonBuilder(SpatialReferences.Wgs84);  polygonBuilder.AddPoint(new MapPoint(60, 25, SpatialReferences.Wgs84));  polygonBuilder.AddPoint(new MapPoint(70, 25, SpatialReferences.Wgs84));  polygonBuilder.AddPoint(new MapPoint(70, 20, SpatialReferences.Wgs84));  polygonBuilder.AddPoint(new MapPoint(60, 20, SpatialReferences.Wgs84));   // Create a stroke symbol layer to be used by hatch patterns.  var strokeForHatches = new SolidStrokeSymbolLayer(2, Color.Red);  var strokeForOutline = new SolidStrokeSymbolLayer(1, Color.Black);   // Create a diagonal cross pattern hatch symbol layers for diagonal cross fill style.  var diagonalStroke1 = new HatchFillSymbolLayer(new MultilayerPolylineSymbol(new List<SymbolLayer>() { strokeForHatches }), 45);  var diagonalStroke2 = new HatchFillSymbolLayer(new MultilayerPolylineSymbol(new List<SymbolLayer>() { strokeForHatches }), -45);   diagonalStroke1.Separation = 9;  diagonalStroke2.Separation = 9;   // Create a multilayer polygon symbol with symbol layers.  var diagonalCrossPolygonSymbol = new MultilayerPolygonSymbol(new List<SymbolLayer>() { diagonalStroke1, diagonalStroke2, strokeForOutline });   // Create a polygon graphic with geometry using the symbol created above.  var diagonalCrossGraphic = new Graphic(polygonBuilder.ToGeometry(), diagonalCrossPolygonSymbol);  overlay.Graphics.Add(diagonalCrossGraphic);   polygonBuilder = new PolygonBuilder(SpatialReferences.Wgs84);  polygonBuilder.AddPoint(new MapPoint(60, 25 - _offset, SpatialReferences.Wgs84));  polygonBuilder.AddPoint(new MapPoint(70, 25 - _offset, SpatialReferences.Wgs84));  polygonBuilder.AddPoint(new MapPoint(70, 20 - _offset, SpatialReferences.Wgs84));  polygonBuilder.AddPoint(new MapPoint(60, 20 - _offset, SpatialReferences.Wgs84));   // Create a forward diagonal pattern hatch symbol layer for forward diagonal fill style.  var forwardDiagonal = new HatchFillSymbolLayer(new MultilayerPolylineSymbol(new List<SymbolLayer>() { strokeForHatches }), -45);  forwardDiagonal.Separation = 9;   // Create a multilayer polygon symbol with symbol layers.  var forwardDiagonalPolygonSymbol = new MultilayerPolygonSymbol(new List<SymbolLayer>() { forwardDiagonal, strokeForOutline });   // Create a polygon graphic with geometry using the symbol created above.  var forwardDiagonalGraphic = new Graphic(polygonBuilder.ToGeometry(), forwardDiagonalPolygonSymbol);  overlay.Graphics.Add(forwardDiagonalGraphic);   polygonBuilder = new PolygonBuilder(SpatialReferences.Wgs84);  polygonBuilder.AddPoint(new MapPoint(60, 25 - 2 * _offset, SpatialReferences.Wgs84));  polygonBuilder.AddPoint(new MapPoint(70, 25 - 2 * _offset, SpatialReferences.Wgs84));  polygonBuilder.AddPoint(new MapPoint(70, 20 - 2 * _offset, SpatialReferences.Wgs84));  polygonBuilder.AddPoint(new MapPoint(60, 20 - 2 * _offset, SpatialReferences.Wgs84));   // Create a vertical pattern hatch symbol layer for vertical fill style.  var vertical = new HatchFillSymbolLayer(new MultilayerPolylineSymbol(new List<SymbolLayer> { strokeForHatches }), 90);  vertical.Separation = 9;   // Create a multilayer polygon symbol with symbol layers.  var verticalPolygonSymbol = new MultilayerPolygonSymbol(new List<SymbolLayer> { vertical, strokeForOutline });   // Create a polygon graphic with geometry using the symbol created above.  var verticalPolygonGraphic = new Graphic(polygonBuilder.ToGeometry(), verticalPolygonSymbol);  overlay.Graphics.Add(verticalPolygonGraphic);  }   #endregion Create a multilayer polygon symbol.   #region Create complex multilayer point symbol.   private void AddComplexPointGraphic(GraphicsOverlay overlay)  {  // Create an orange envelope with reddish outline.  var orangeFillLayer = new SolidFillSymbolLayer(Color.Orange);  var pinkOutline = new SolidStrokeSymbolLayer(2, Color.Blue);  var orangeSquareGeometry = new Envelope(new MapPoint(-0.5, -0.5, SpatialReferences.Wgs84), new MapPoint(0.5, 0.5, SpatialReferences.Wgs84));  var orangeSquareVectorElement = new VectorMarkerSymbolElement(orangeSquareGeometry, new MultilayerPolygonSymbol(new List<SymbolLayer>() { orangeFillLayer, pinkOutline }));  var orangeSquareVectorMarkerLayer = new VectorMarkerSymbolLayer(new[] { orangeSquareVectorElement });  orangeSquareVectorMarkerLayer.Size = 11;  orangeSquareVectorMarkerLayer.Anchor = new SymbolAnchor(-4, -6, SymbolAnchorPlacementMode.Absolute);   // Create a black envelope.  var blackFillLayer = new SolidFillSymbolLayer(Color.Black);  var orangeOutline = new SolidStrokeSymbolLayer(2, Color.OrangeRed);  var blackSquareGeometry = new Envelope(new MapPoint(-0.5, -0.5, SpatialReferences.Wgs84), new MapPoint(0.5, 0.5, SpatialReferences.Wgs84));  var blackSquareVectorElement = new VectorMarkerSymbolElement(blackSquareGeometry, new MultilayerPolygonSymbol(new List<SymbolLayer>() { blackFillLayer, orangeOutline }));  var blackSquareVectorMarkerLayer = new VectorMarkerSymbolLayer(new[] { blackSquareVectorElement });  blackSquareVectorMarkerLayer.Size = 6;  blackSquareVectorMarkerLayer.Anchor = new SymbolAnchor(2, 1, SymbolAnchorPlacementMode.Absolute);   // Create an envelope with no purple outline.  var transparentFillLayer = new SolidFillSymbolLayer(Color.Transparent);  var purpleOutline = new SolidStrokeSymbolLayer(2, Color.Purple);  var purpleSquareGeometry = new Envelope(new MapPoint(-0.5, -0.5, SpatialReferences.Wgs84), new MapPoint(0.5, 0.5, SpatialReferences.Wgs84));  var purpleSquareVectorElement = new VectorMarkerSymbolElement(purpleSquareGeometry, new MultilayerPolygonSymbol(new List<SymbolLayer>() { transparentFillLayer, purpleOutline }));  var purpleSquareVectorMarkerLayer = new VectorMarkerSymbolLayer(new[] { purpleSquareVectorElement });  purpleSquareVectorMarkerLayer.Size = 14;  purpleSquareVectorMarkerLayer.Anchor = new SymbolAnchor(4, 2, SymbolAnchorPlacementMode.Absolute);   // First layer with its marker graphics and nested symbol layers.  Geometry hexagonElementGeometry = Geometry.FromJson("{\"rings\":[[[-2.89,5.0],[2.89,5.0],[5.77,0.0],[2.89,-5.0],[-2.89,-5.0],[-5.77,0.0],[-2.89,5.0]]]}");  var yellowFillLayer = new SolidFillSymbolLayer(Color.Yellow);  var blackOutline = new SolidStrokeSymbolLayer(2, Color.Black);  var hexagonVectorElement = new VectorMarkerSymbolElement(hexagonElementGeometry, new MultilayerPolygonSymbol(new List<SymbolLayer>() { yellowFillLayer, blackOutline }));  var hexagonVectorMarkerLayer = new VectorMarkerSymbolLayer(new[] { hexagonVectorElement });  hexagonVectorMarkerLayer.Size = 35;   // Create the multilayer point symbol.  var pointSymbol = new MultilayerPointSymbol(new List<SymbolLayer> { hexagonVectorMarkerLayer, orangeSquareVectorMarkerLayer, blackSquareVectorMarkerLayer, purpleSquareVectorMarkerLayer });   // Create the multilayer point graphic using the symbols created above.  var complexPointGraphic = new Graphic(new MapPoint(130, 20, SpatialReferences.Wgs84), pointSymbol);  overlay.Graphics.Add(complexPointGraphic);  }   #endregion Create complex multilayer point symbol.   #region Create complex multilayer polyline symbol.   private void AddComplexPolylineGraphic(GraphicsOverlay overlay)  {  // Symbol layers for multilayer polyline.  var blackDashes = new SolidStrokeSymbolLayer(1, Color.Black);  var dashEffect = new DashGeometricEffect(new double[] { 5, 3 });  blackDashes.GeometricEffects.Add(dashEffect);  blackDashes.CapStyle = StrokeSymbolLayerCapStyle.Square;   // Create the yellow stroke inside.  var yellowStroke = new SolidStrokeSymbolLayer(5, Color.Yellow);  yellowStroke.CapStyle = StrokeSymbolLayerCapStyle.Round;   // Create the black outline.  var blackOutline = new SolidStrokeSymbolLayer(7, Color.Black);  blackOutline.CapStyle = StrokeSymbolLayerCapStyle.Round;   // Create the multilayer polyline symbol.  var polylineSymbol = new MultilayerPolylineSymbol(new List<SymbolLayer> { blackOutline, yellowStroke, blackDashes });  var polylineBuilder = new PolylineBuilder(SpatialReferences.Wgs84);  polylineBuilder.AddPoint(new MapPoint(120, -25, SpatialReferences.Wgs84));  polylineBuilder.AddPoint(new MapPoint(140, -25, SpatialReferences.Wgs84));   // Create the multilayer polyline graphic with geometry using the symbols created above.  var complexLineGraphic = new Graphic(polylineBuilder.ToGeometry(), polylineSymbol);  overlay.Graphics.Add(complexLineGraphic);  }   #endregion Create complex multilayer polyline symbol.   #region Create complex multilayer polygon symbol.   private void AddComplexPolygonGraphic(GraphicsOverlay overlay)  {  // Create the black outline.  SolidStrokeSymbolLayer blackOutline = new SolidStrokeSymbolLayer(7, Color.Black);  blackOutline.CapStyle = StrokeSymbolLayerCapStyle.Round;   // Create the yellow stroke inside.  SolidStrokeSymbolLayer yellowStroke = new SolidStrokeSymbolLayer(5, Color.Yellow);  yellowStroke.CapStyle = StrokeSymbolLayerCapStyle.Round;   // Symbol layers for multilayer polyline.  SolidStrokeSymbolLayer blackDashes = new SolidStrokeSymbolLayer(1, Color.Black);  GeometricEffect dashEffect = new DashGeometricEffect(new double[] { 5, 3 });  blackDashes.GeometricEffects.Add(dashEffect);  blackDashes.CapStyle = StrokeSymbolLayerCapStyle.Square;   // Create a red filling for the polygon.  SolidFillSymbolLayer redFillLayer = new SolidFillSymbolLayer(Color.Red);   // Create the multilayer polygon symbol.  MultilayerPolygonSymbol polygonSymbol = new MultilayerPolygonSymbol(new List<SymbolLayer> { redFillLayer, blackOutline, yellowStroke, blackDashes });   // Create the polygon.  PolygonBuilder polygonBuilder = new PolygonBuilder(SpatialReferences.Wgs84);  polygonBuilder.AddPoint(new MapPoint(120, 0, SpatialReferences.Wgs84));  polygonBuilder.AddPoint(new MapPoint(140, 0, SpatialReferences.Wgs84));  polygonBuilder.AddPoint(new MapPoint(140, -10, SpatialReferences.Wgs84));  polygonBuilder.AddPoint(new MapPoint(120, -10, SpatialReferences.Wgs84));   // Create a multilayer polygon graphic with geometry using the symbols created above.  Graphic complexPolygonGraphic = new Graphic(polygonBuilder.ToGeometry(), polygonSymbol);  overlay.Graphics.Add(complexPolygonGraphic);  }   #endregion Create complex multilayer polygon symbol.  } }