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
// Copyright 2016 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 System;
using Esri.ArcGISRuntime.Data;
using Esri.ArcGISRuntime.Mapping;
using Esri.ArcGISRuntime.Symbology;
using Esri.ArcGISRuntime.UI.Controls;
using Foundation;
using UIKit;
namespace ArcGISRuntime.Samples.RenderUniqueValues
{
[Register("RenderUniqueValues")]
[ArcGISRuntime.Samples.Shared.Attributes.Sample(
name: "Unique value renderer",
category: "Symbology",
description: "Render features in a layer using a distinct symbol for each unique attribute value.",
instructions: "The map with the symbolized feature layer will be shown automatically when the sample loads.",
tags: new[] { "draw", "renderer", "symbol", "symbology", "values" })]
public class RenderUniqueValues : UIViewController
{
// Hold references to UI controls.
private MapView _myMapView;
public RenderUniqueValues()
{
Title = "Render unique values";
}
private void Initialize()
{
// Create new Map with a topographic basemap.
Map myMap = new Map(BasemapStyle.ArcGISTopographic);
// Create URI pointing to the feature service.
Uri serviceUri = new Uri("https://sampleserver6.arcgisonline.com/arcgis/rest/services/Census/MapServer/3");
// Create service feature table.
ServiceFeatureTable statesFeatureTable = new ServiceFeatureTable(serviceUri);
// Create a new feature layer using the service feature table.
FeatureLayer statesLayer = new FeatureLayer(statesFeatureTable);
// Create a new unique value renderer.
UniqueValueRenderer regionRenderer = new UniqueValueRenderer();
// Add the "SUB_REGION" field to the renderer.
regionRenderer.FieldNames.Add("SUB_REGION");
// Define a line symbol to use for the region fill symbols.
SimpleLineSymbol stateOutlineSymbol = new SimpleLineSymbol(
SimpleLineSymbolStyle.Solid, System.Drawing.Color.White, 0.7);
// Define distinct fill symbols for a few regions (use the same outline symbol).
SimpleFillSymbol pacificFillSymbol = new SimpleFillSymbol(
SimpleFillSymbolStyle.Solid, System.Drawing.Color.Blue, stateOutlineSymbol);
SimpleFillSymbol mountainFillSymbol = new SimpleFillSymbol(
SimpleFillSymbolStyle.Solid, System.Drawing.Color.LawnGreen, stateOutlineSymbol);
SimpleFillSymbol westSouthCentralFillSymbol = new SimpleFillSymbol(
SimpleFillSymbolStyle.Solid, System.Drawing.Color.SandyBrown, stateOutlineSymbol);
// Add values to the renderer: define the label, description, symbol, and attribute value for each.
regionRenderer.UniqueValues.Add(
new UniqueValue("Pacific", "Pacific Region", pacificFillSymbol, "Pacific"));
regionRenderer.UniqueValues.Add(
new UniqueValue("Mountain", "Rocky Mountain Region", mountainFillSymbol, "Mountain"));
regionRenderer.UniqueValues.Add(
new UniqueValue("West South Central", "West South Central Region", westSouthCentralFillSymbol, "West South Central"));
// Set the default region fill symbol (transparent with no outline) for regions not explicitly defined in the renderer
regionRenderer.DefaultSymbol = new SimpleFillSymbol(SimpleFillSymbolStyle.Cross, System.Drawing.Color.Gray, null);
regionRenderer.DefaultLabel = "Other";
// Apply the unique value renderer to the states layer.
statesLayer.Renderer = regionRenderer;
// Add created layer to the map.
myMap.OperationalLayers.Add(statesLayer);
// Assign the map to the MapView.
_myMapView.Map = myMap;
// Feature table initialization.
statesFeatureTable.RetryLoadAsync();
}
public override void ViewDidLoad()
{
base.ViewDidLoad();
Initialize();
}
public override void LoadView()
{
// Create the views.
View = new UIView() { BackgroundColor = ApplicationTheme.BackgroundColor };
_myMapView = new MapView();
_myMapView.TranslatesAutoresizingMaskIntoConstraints = false;
// Add the views.
View.AddSubviews(_myMapView);
// Lay out the views.
NSLayoutConstraint.ActivateConstraints(new[]
{
_myMapView.TopAnchor.ConstraintEqualTo(View.SafeAreaLayoutGuide.TopAnchor),
_myMapView.BottomAnchor.ConstraintEqualTo(View.BottomAnchor),
_myMapView.LeadingAnchor.ConstraintEqualTo(View.LeadingAnchor),
_myMapView.TrailingAnchor.ConstraintEqualTo(View.TrailingAnchor)
});
}
}
}