Feature collection layer

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
// 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.Data;
using Esri.ArcGISRuntime.Geometry;
using Esri.ArcGISRuntime.Mapping;
using Esri.ArcGISRuntime.Symbology;

using Colors = System.Drawing.Color;

namespace ArcGIS.Samples.CreateFeatureCollectionLayer
{
    [ArcGIS.Samples.Shared.Attributes.Sample(
        name: "Feature collection layer",
        category: "Layers",
        description: "Create a Feature Collection Layer from a Feature Collection Table, and add it to a map.",
        instructions: "When launched, this sample displays a `FeatureCollectionLayer` with a `Point`, `Polyline` and `Polygon` geometry.",
        tags: new[] { "feature collection", "layers" })]
    public partial class CreateFeatureCollectionLayer : ContentPage
    {
        public CreateFeatureCollectionLayer()
        {
            InitializeComponent();

            // call a function to initialize a map to display in the MyMapView control
            Initialize();
        }

        private void Initialize()
        {
            // Create a new map with the oceans basemap and add it to the map view
            Map myMap = new Map(BasemapStyle.ArcGISOceans);
            MyMapView.Map = myMap;

            // Call a function that will create a new feature collection layer and zoom to it
            _ = CreateNewFeatureCollection();
        }

        private async Task CreateNewFeatureCollection()
        {
            // Create the schema for a points table (one text field to contain a name attribute)
            List<Field> pointFields = new List<Field>();
            Field placeField = new Field(FieldType.Text, "Place", "Place Name", 50);
            pointFields.Add(placeField);

            // Create the schema for a lines table (one text field to contain a name attribute)
            List<Field> lineFields = new List<Field>();
            Field boundaryField = new Field(FieldType.Text, "Boundary", "Boundary Name", 50);
            lineFields.Add(boundaryField);

            // Create the schema for a polygon table (one text field to contain a name attribute)
            List<Field> polyFields = new List<Field>();
            Field areaField = new Field(FieldType.Text, "AreaName", "Area Name", 50);
            polyFields.Add(areaField);

            // Instantiate FeatureCollectionTables with schema and geometry type
            FeatureCollectionTable pointsTable = new FeatureCollectionTable(pointFields, GeometryType.Point, SpatialReferences.Wgs84);
            FeatureCollectionTable linesTable = new FeatureCollectionTable(lineFields, GeometryType.Polyline, SpatialReferences.Wgs84);
            FeatureCollectionTable polysTable = new FeatureCollectionTable(polyFields, GeometryType.Polygon, SpatialReferences.Wgs84);

            // Set rendering for each table
            pointsTable.Renderer = CreateRenderer(GeometryType.Point);
            linesTable.Renderer = CreateRenderer(GeometryType.Polyline);
            polysTable.Renderer = CreateRenderer(GeometryType.Polygon);

            // Create a new point feature, provide geometry and attribute values
            Feature pointFeature = pointsTable.CreateFeature();
            pointFeature.SetAttributeValue(placeField, "Current location");
            MapPoint point1 = new MapPoint(-79.497238, 8.849289, SpatialReferences.Wgs84);
            pointFeature.Geometry = point1;

            // Create a new line feature, provide geometry and attribute values
            Feature lineFeature = linesTable.CreateFeature();
            lineFeature.SetAttributeValue(boundaryField, "AManAPlanACanalPanama");
            MapPoint point2 = new MapPoint(-80.035568, 9.432302, SpatialReferences.Wgs84);
            Polyline line = new Polyline(new MapPoint[] { point1, point2 });
            lineFeature.Geometry = line;

            // Create a new polygon feature, provide geometry and attribute values
            Feature polyFeature = polysTable.CreateFeature();
            polyFeature.SetAttributeValue(areaField, "Restricted area");
            MapPoint point3 = new MapPoint(-79.337936, 8.638903, SpatialReferences.Wgs84);
            MapPoint point4 = new MapPoint(-79.11409, 8.895422, SpatialReferences.Wgs84);
            Polygon poly = new Polygon(new MapPoint[] { point1, point3, point4 });
            polyFeature.Geometry = poly;

            try
            {
                // Add the new features to the appropriate feature collection table
                await pointsTable.AddFeatureAsync(pointFeature);
                await linesTable.AddFeatureAsync(lineFeature);
                await polysTable.AddFeatureAsync(polyFeature);

                // Create a feature collection and add the feature collection tables
                FeatureCollection featuresCollection = new FeatureCollection();
                featuresCollection.Tables.Add(pointsTable);
                featuresCollection.Tables.Add(linesTable);
                featuresCollection.Tables.Add(polysTable);

                // Create a FeatureCollectionLayer
                FeatureCollectionLayer collectionLayer = new FeatureCollectionLayer(featuresCollection);

                // When the layer loads, zoom the map centered on the feature collection
                await collectionLayer.LoadAsync();
                await MyMapView.SetViewpointCenterAsync(collectionLayer.FullExtent.GetCenter(), 1000000);

                // Add the layer to the Map's Operational Layers collection
                MyMapView.Map.OperationalLayers.Add(collectionLayer);
            }
            catch (Exception e)
            {
                await Application.Current.MainPage.DisplayAlert("Error", e.ToString(), "OK");
            }
        }

        private Renderer CreateRenderer(GeometryType rendererType)
        {
            // Return a simple renderer to match the geometry type provided
            Symbol sym = null;

            switch (rendererType)
            {
                case GeometryType.Point:
                case GeometryType.Multipoint:
                    // Create a marker symbol
                    sym = new SimpleMarkerSymbol(SimpleMarkerSymbolStyle.Triangle, Colors.Red, 18);
                    break;

                case GeometryType.Polyline:
                    // Create a line symbol
                    sym = new SimpleLineSymbol(SimpleLineSymbolStyle.Dash, Colors.Green, 3);
                    break;

                case GeometryType.Polygon:
                    // Create a fill symbol
                    SimpleLineSymbol lineSym = new SimpleLineSymbol(SimpleLineSymbolStyle.Solid, Colors.DarkBlue, 2);
                    sym = new SimpleFillSymbol(SimpleFillSymbolStyle.DiagonalCross, Colors.Cyan, lineSym);
                    break;

                default:
                    break;
            }

            // Return a new renderer that uses the symbol created above
            return new SimpleRenderer(sym);
        }
    }
}