Add graphics with 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 // 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 Colors = System.Drawing.Color; using PointCollection = Esri.ArcGISRuntime.Geometry.PointCollection;  namespace ArcGIS.Samples.AddGraphicsWithSymbols {  [ArcGIS.Samples.Shared.Attributes.Sample(  name: "Add graphics with symbols",  category: "GraphicsOverlay",  description: "Use a symbol style to display a graphic on a graphics overlay.",  instructions: "Observe the graphics on the map.",  tags: new[] { "display", "fill", "graphics", "line", "marker", "overlay", "point", "symbol" })]  public partial class AddGraphicsWithSymbols : ContentPage  {  // Create the graphics overlay.  private readonly GraphicsOverlay _overlay = new GraphicsOverlay();   public AddGraphicsWithSymbols()  {  InitializeComponent();   // Create the UI, setup the control references and execute initialization.  Initialize();  }   private void Initialize()  {  // Create the map.  Map myMap = new Map(BasemapStyle.ArcGISOceans);  myMap.InitialViewpoint = new Viewpoint(56.075844, -2.681572, 13);   // Add the map to the map view.  MyMapView.Map = myMap;   // Add the graphics overlay to the map view.  MyMapView.GraphicsOverlays.Add(_overlay);   // Call functions to create the graphics.  CreatePoints();  CreatePolygon();  CreatePolyline();  CreateText();   // Update the extent to encompass all of the symbols.  SetExtent();  }   private void CreatePoints()  {  // Create a red circle simple marker symbol.  SimpleMarkerSymbol redCircleSymbol = new SimpleMarkerSymbol(SimpleMarkerSymbolStyle.Circle, Colors.Red, 10);   // Create graphics and add them to graphics overlay.  Graphic graphic = new Graphic(new MapPoint(-2.72, 56.065, SpatialReferences.Wgs84), redCircleSymbol);  _overlay.Graphics.Add(graphic);   graphic = new Graphic(new MapPoint(-2.69, 56.065, SpatialReferences.Wgs84), redCircleSymbol);  _overlay.Graphics.Add(graphic);   graphic = new Graphic(new MapPoint(-2.66, 56.065, SpatialReferences.Wgs84), redCircleSymbol);  _overlay.Graphics.Add(graphic);   graphic = new Graphic(new MapPoint(-2.63, 56.065, SpatialReferences.Wgs84), redCircleSymbol);  _overlay.Graphics.Add(graphic);  }   private void CreatePolyline()  {  // Create a purple simple line symbol.  SimpleLineSymbol lineSymbol = new SimpleLineSymbol(SimpleLineSymbolStyle.Dash, Colors.Purple, 4);   // Create a new point collection for polyline.  PointCollection points = new PointCollection(SpatialReferences.Wgs84)  {  // Create and add points to the point collection.  new MapPoint(-2.715, 56.061),  new MapPoint(-2.6438, 56.079),  new MapPoint(-2.638, 56.079),  new MapPoint(-2.636, 56.078),  new MapPoint(-2.636, 56.077),  new MapPoint(-2.637, 56.076),  new MapPoint(-2.715, 56.061)  };   // Create the polyline from the point collection.  Polyline polyline = new Polyline(points);   // Create the graphic with polyline and symbol.  Graphic graphic = new Graphic(polyline, lineSymbol);   // Add graphic to the graphics overlay.  _overlay.Graphics.Add(graphic);  }   private void CreatePolygon()  {  // Create a green simple line symbol.  SimpleLineSymbol outlineSymbol = new SimpleLineSymbol(SimpleLineSymbolStyle.Dash, Colors.Green, 1);   // Create a green mesh simple fill symbol.  SimpleFillSymbol fillSymbol = new SimpleFillSymbol(SimpleFillSymbolStyle.DiagonalCross, Colors.Green, outlineSymbol);   // Create a new point collection for polygon.  PointCollection points = new PointCollection(SpatialReferences.Wgs84)  {  // Create and add points to the point collection.  new MapPoint(-2.6425, 56.0784),  new MapPoint(-2.6430, 56.0763),  new MapPoint(-2.6410, 56.0759),  new MapPoint(-2.6380, 56.0765),  new MapPoint(-2.6380, 56.0784),  new MapPoint(-2.6410, 56.0786)  };   // Create the polyline from the point collection.  Polygon polygon = new Polygon(points);   // Create the graphic with polyline and symbol.  Graphic graphic = new Graphic(polygon, fillSymbol);   // Add graphic to the graphics overlay.  _overlay.Graphics.Add(graphic);  }   private void CreateText()  {  // Create two text symbols.  TextSymbol bassRockTextSymbol = new TextSymbol("Black Rock", Colors.Blue, 10,  Esri.ArcGISRuntime.Symbology.HorizontalAlignment.Left, Esri.ArcGISRuntime.Symbology.VerticalAlignment.Bottom);   TextSymbol craigleithTextSymbol = new TextSymbol("Craigleith", Colors.Blue, 10,  Esri.ArcGISRuntime.Symbology.HorizontalAlignment.Right, Esri.ArcGISRuntime.Symbology.VerticalAlignment.Top);   // Create two points.  MapPoint bassPoint = new MapPoint(-2.64, 56.079, SpatialReferences.Wgs84);  MapPoint craigleithPoint = new MapPoint(-2.72, 56.076, SpatialReferences.Wgs84);   // Create two graphics from the points and symbols.  Graphic bassRockGraphic = new Graphic(bassPoint, bassRockTextSymbol);  Graphic craigleithGraphic = new Graphic(craigleithPoint, craigleithTextSymbol);   // Add graphics to the graphics overlay.  _overlay.Graphics.Add(bassRockGraphic);  _overlay.Graphics.Add(craigleithGraphic);  }   private void SetExtent()  {  // Get all of the graphics contained in the graphics overlay.  GraphicCollection myGraphicCollection = _overlay.Graphics;   // Create a new envelope builder using the same spatial reference as the graphics.  EnvelopeBuilder myEnvelopeBuilder = new EnvelopeBuilder(SpatialReferences.Wgs84);   // Loop through each graphic in the graphic collection.  foreach (Graphic oneGraphic in myGraphicCollection)  {  // Union the extent of each graphic in the envelope builder.  myEnvelopeBuilder.UnionOf(oneGraphic.Geometry.Extent);  }   // Expand the envelope builder by 30%.  myEnvelopeBuilder.Expand(1.3);   // Adjust the viewable area of the map to encompass all of the graphics in the  // graphics overlay plus an extra 30% margin for better viewing.  MyMapView.SetViewpointAsync(new Viewpoint(myEnvelopeBuilder.Extent));  }  } }