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ArcGIS Runtime SDK for .NET

Change feature layer renderer

This code sample is available for these platforms:
View Sample on GitHub

Change the appearance of a feature layer with a renderer.

Image of change feature layer 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 buttons 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

  1. Create a ServiceFeatureTable from a URL.
  2. Create a FeatureLayer from the service feature table.
  3. Create a new renderer (in this case, a SimpleRenderer).
  4. 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 Riverside County, California, showing parcels of land and whether they have pool permits. Red polygons indicate parcels that do have permits.

Tags

feature layer, renderer, visualization

Sample Code

<UserControl
    x:Class="ArcGISRuntime.UWP.Samples.ChangeFeatureLayerRenderer.ChangeFeatureLayerRenderer"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:esri="using:Esri.ArcGISRuntime"
    xmlns:esriUI="using:Esri.ArcGISRuntime.UI.Controls"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    d:DesignHeight="300"
    d:DesignWidth="300"
    mc:Ignorable="d">
    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition Height="auto" />
            <RowDefinition Height="*" />
        </Grid.RowDefinitions>
        <CommandBar Grid.Row="0" OverflowButtonVisibility="Collapsed">
            <AppBarButton
                Name="Reset"
                Click="OnResetButtonClicked"
                Content="Reset" />
            <AppBarButton
                Name="ApplyRenderer"
                Click="OnOverrideButtonClicked"
                Content="Override" />
        </CommandBar>
        <esriUI:MapView x:Name="MyMapView" Grid.Row="1" />
    </Grid>
</UserControl>
// 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 Esri.ArcGISRuntime.Data;
using Esri.ArcGISRuntime.Geometry;
using Esri.ArcGISRuntime.Mapping;
using Esri.ArcGISRuntime.Symbology;
using System;
using System.Drawing;
using Windows.UI.Xaml;

namespace ArcGISRuntime.UWP.Samples.ChangeFeatureLayerRenderer
{
    [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 buttons 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" })]
    public partial class ChangeFeatureLayerRenderer
    {
        // Create and hold reference to the feature layer
        private FeatureLayer _featureLayer;

        public ChangeFeatureLayerRenderer()
        {
            InitializeComponent();

            // Setup the control references and execute initialization 
            Initialize();
        }

        private void Initialize()
        {
            // Create new Map with basemap
            Map myMap = new Map(Basemap.CreateTopographic());

            // Create and set initial map area
            Envelope initialLocation = new Envelope(
                -1.30758164047166E7, 4014771.46954516, -1.30730056797177E7, 4016869.78617381,
                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://sampleserver6.arcgisonline.com/arcgis/rest/services/PoolPermits/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);
        }

        private void OnOverrideButtonClicked(object sender, RoutedEventArgs e)
        {
            // Create a symbol to be used in the renderer
            SimpleLineSymbol symbol = new SimpleLineSymbol()
            {
                Color = Color.Blue,
                Width = 2,
                Style = SimpleLineSymbolStyle.Solid
            };

            // Create a new renderer using the symbol just created
            SimpleRenderer renderer = new SimpleRenderer(symbol);

            // Assign the new renderer to the feature layer
            _featureLayer.Renderer = renderer;
        }

        private void OnResetButtonClicked(object sender, RoutedEventArgs e)
        {
            // Reset the renderer to default
            _featureLayer.ResetRenderer();
        }
    }
}