Change the appearance of a feature layer with a renderer.
Use case
A feature layer hosted on ArcGIS Online has a preset renderer and will display in an ArcGIS Runtime application with that renderer. However, for example, the color associated with the original renderer may be unsuitable for a company with staff or clients who are color blind, or for presentation with a different set of basemap and operational layers. In these cases, the renderer on the feature layer's data can be set to a more suitable color.
How to use the sample
Use the button in the control panel to change the renderer on the feature layer. The original renderer displays orange circles, the diameters of which are proportional to carbon storage of each tree. When the blue renderer in this sample is applied, it displays the location of the trees simply as blue points.
How it works
Create a ServiceFeatureTable from a URL.
Create a FeatureLayer from the service feature table.
Create a new renderer (in this case, a SimpleRenderer).
Change the feature layer's renderer using the FeatureLayer.Renderer property.
Relevant API
FeatureLayer.Renderer
ServiceFeatureTable
SimpleRenderer
About the data
This sample displays a feature layer in Warren Wilson College, North Carolina, showing carbon storage of trees on campus. The size of each circle is proportional to that particular tree's carbon storage total.
Tags
feature layer, renderer, visualization
Sample Code
ChangeFeatureLayerRenderer.cs
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// Copyright 2021 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 Android.App;
using Android.OS;
using Android.Widget;
using Esri.ArcGISRuntime.Data;
using Esri.ArcGISRuntime.Geometry;
using Esri.ArcGISRuntime.Mapping;
using Esri.ArcGISRuntime.Symbology;
using Esri.ArcGISRuntime.UI.Controls;
using System;
using System.Drawing;
namespaceArcGISRuntime.Samples.ChangeFeatureLayerRenderer{
[Activity (ConfigurationChanges=Android.Content.PM.ConfigChanges.Orientation | Android.Content.PM.ConfigChanges.ScreenSize)]
[ArcGISRuntime.Samples.Shared.Attributes.Sample(
name: "Change feature layer renderer",
category: "Layers",
description: "Change the appearance of a feature layer with a renderer.",
instructions: "Use the button in the control panel to change the renderer on the feature layer. The original renderer displays orange circles, the diameters of which are proportional to carbon storage of each tree. When the blue renderer in this sample is applied, it displays the location of the trees simply as blue points.",
tags: new[] { "feature layer", "renderer", "visualization" })]
publicclassChangeFeatureLayerRenderer : Activity {
// Hold a reference to the map viewprivate MapView _myMapView;
// Create and hold reference to the feature layerprivate FeatureLayer _featureLayer;
private Button _overrideButton;
private Button _resetButton;
protectedoverridevoidOnCreate(Bundle bundle) {
base.OnCreate(bundle);
Title = "Change feature layer renderer";
// Create the UI, setup the control references and execute initialization CreateLayout();
Initialize();
}
privatevoidInitialize() {
// Create new Map with basemap Map myMap = new Map(BasemapStyle.ArcGISTopographic);
// Create and set initial map area Envelope initialLocation = new Envelope(
-9177811, 4247000, -9176791, 4247784,
SpatialReferences.WebMercator);
// Set the initial viewpoint for map myMap.InitialViewpoint = new Viewpoint(initialLocation);
// Provide used Map to the MapView _myMapView.Map = myMap;
// Create uri to the used feature service Uri serviceUri = new Uri("https://services.arcgis.com/V6ZHFr6zdgNZuVG0/arcgis/rest/services/Landscape_Trees/FeatureServer/0");
// Initialize feature table using a url to feature server url ServiceFeatureTable featureTable = new ServiceFeatureTable(serviceUri);
// Initialize a new feature layer based on the feature table _featureLayer = new FeatureLayer(featureTable);
myMap.OperationalLayers.Add(_featureLayer);
}
privatevoidOnOverrideButtonClicked(object sender, EventArgs e) {
// Create a symbol to be used in the renderer. SimpleMarkerSymbol symbol = new SimpleMarkerSymbol(SimpleMarkerSymbolStyle.Circle, Color.Blue, 5);
// Create and apply a new renderer using the symbol just created. _featureLayer.Renderer = new SimpleRenderer(symbol);
// Enable the reset button. _overrideButton.Enabled = false;
_resetButton.Enabled = true;
}
privatevoidOnResetButtonClicked(object sender, EventArgs e) {
// Reset the renderer to default _featureLayer.ResetRenderer();
// Re-enable the override button. _overrideButton.Enabled = true;
_resetButton.Enabled = false;
}
privatevoidCreateLayout() {
// Create a new vertical layout for the app LinearLayout layout = new LinearLayout(this) { Orientation = Orientation.Vertical };
// Create a button to apply new renderer _overrideButton = new Button(this)
{
Text = "Override" };
_overrideButton.Click += OnOverrideButtonClicked;
// Create a button to reset the renderer _resetButton = new Button(this)
{
Text = "Reset",
Enabled = false };
_resetButton.Click += OnResetButtonClicked;
// Add Override Button to the layout layout.AddView(_overrideButton);
// Add Reset Button to the layout layout.AddView(_resetButton);
// Add the map view to the layout _myMapView = new MapView(this);
layout.AddView(_myMapView);
// Show the layout in the app SetContentView(layout);
}
}
}