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ArcGIS Runtime SDK for .NET

Feature layer rendering mode (map)

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

Render features statically or dynamically by setting the feature layer rendering mode.

screenshot

Use case

In dynamic rendering mode, features and graphics are stored on the GPU. As a result, dynamic rendering mode is good for moving objects and for maintaining graphical fidelity during extent changes, since individual graphic changes can be efficiently applied directly to the GPU state. This gives the map or scene a seamless look and feel when interacting with it. The number of features and graphics has a direct impact on GPU resources, so large numbers of features or graphics can affect the responsiveness of maps or scenes to user interaction. Ultimately, the number and complexity of features and graphics that can be rendered in dynamic rendering mode is dependent on the power and memory of the device's GPU.

In static rendering mode, features and graphics are rendered only when needed (for example, after an extent change) and offloads a significant portion of the graphical processing onto the CPU. As a result, less work is required by the GPU to draw the graphics, and the GPU can spend its resources on keeping the UI interactive. Use this mode for stationary graphics, complex geometries, and very large numbers of features or graphics. The number of features and graphics has little impact on frame render time, meaning it scales well, and pushes a constant GPU payload. However, rendering updates is CPU and system memory intensive, which can have an impact on device battery life.

How to use the sample

Click the button to trigger the same zoom animation on both static and dynamic maps.

How it works

  1. Create feature layers, setting the rendering mode on each before adding to the map
  2. The RenderingMode can be set to Static, Dynamic, or Automatic.
    • In Static rendering mode, the number of features and graphics has little impact on frame render time, meaning it scales well, however points don't stay screen-aligned and point/polyline/polygon objects are only redrawn once map view navigation is complete.
    • In Dynamic rendering mode, large numbers of features or graphics can affect the responsiveness of maps or scenes to user interaction, however points remain screen-aligned and point/polyline/polygon objects are continually redrawn while the map view is navigating.
  3. When left to automatic rendering, points are drawn dynamically and polylines and polygons statically.

Relevant API

  • Map
  • FeatureLayer
  • FeatureLayer.RenderingMode
  • MapView

Tags

FeatureRenderingMode, MapViews SceneViews and UI, dynamic, static

Sample Code

<UserControl
    x:Class="ArcGISRuntime.UWP.Samples.FeatureLayerRenderingModeMap.FeatureLayerRenderingModeMap"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:esriUI="using:Esri.ArcGISRuntime.UI.Controls">
    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition Height="auto" />
            <RowDefinition Height="*" />
            <RowDefinition Height="auto" />
            <RowDefinition Height="*" />
        </Grid.RowDefinitions>
        <Grid.ColumnDefinitions>
            <ColumnDefinition Width="*" />
            <ColumnDefinition Width="*" />
        </Grid.ColumnDefinitions>
        <TextBlock Text="Static mode:"
                   Grid.Row="0" Grid.ColumnSpan="2"
                   FontWeight="SemiBold" VerticalAlignment="Center"
                   Foreground="RoyalBlue"/>
        <esriUI:MapView x:Name="MyStaticMapView"
                        Grid.Row="1" Grid.Column="0" Grid.ColumnSpan="2" />
        <TextBlock Text="Dynamic mode:"
                   Grid.Row="2" Grid.Column="0"
                   FontWeight="SemiBold" VerticalAlignment="Center"
                   Foreground="RoyalBlue"/>
        <Button Content="Animated zoom"
                Grid.Row="2" Grid.Column="1"
                HorizontalAlignment="Stretch"
                Click="OnZoomClick" />
        <esriUI:MapView x:Name="MyDynamicMapView"
                        Grid.Row="3" Grid.Column="0" Grid.ColumnSpan="2" />
    </Grid>
</UserControl>
// Copyright 2017 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.Mapping;
using Esri.ArcGISRuntime.Data;
using Esri.ArcGISRuntime.Geometry;
using System;
using System.Collections.Generic;
using System.Threading.Tasks;
using Windows.UI.Popups;

namespace ArcGISRuntime.UWP.Samples.FeatureLayerRenderingModeMap
{
    [ArcGISRuntime.Samples.Shared.Attributes.Sample(
        "Feature layer rendering mode (Map)",
        "Layers",
        "This sample demonstrates how to use load settings to set preferred rendering mode for feature layers, specifically static or dynamic rendering modes.",
        "")]
    public partial class FeatureLayerRenderingModeMap
    {
        // Viewpoint locations for map view to zoom in and out to.
        private Viewpoint _zoomOutPoint = new Viewpoint(new MapPoint(-118.37, 34.46, SpatialReferences.Wgs84), 650000, 0);
        private Viewpoint _zoomInPoint = new Viewpoint(new MapPoint(-118.45, 34.395, SpatialReferences.Wgs84), 50000, 90);

        public FeatureLayerRenderingModeMap()
        {
            InitializeComponent();

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

        private void Initialize()
        {
            // Set the initial viewpoint on the maps.
            MyStaticMapView.Map = new Map
            {
                InitialViewpoint = _zoomOutPoint
            };

            MyDynamicMapView.Map = new Map
            {
                InitialViewpoint = _zoomOutPoint
            };

            // Create service feature table using a point, polyline, and polygon service.
            ServiceFeatureTable pointServiceFeatureTable = new ServiceFeatureTable(new Uri("https://sampleserver6.arcgisonline.com/arcgis/rest/services/Energy/Geology/FeatureServer/0"));
            ServiceFeatureTable polylineServiceFeatureTable = new ServiceFeatureTable(new Uri("https://sampleserver6.arcgisonline.com/arcgis/rest/services/Energy/Geology/FeatureServer/8"));
            ServiceFeatureTable polygonServiceFeatureTable = new ServiceFeatureTable(new Uri("https://sampleserver6.arcgisonline.com/arcgis/rest/services/Energy/Geology/FeatureServer/9"));

            // Create feature layers from service feature tables
            List<FeatureLayer> featureLayers = new List<FeatureLayer>
            {
                new FeatureLayer(polygonServiceFeatureTable),
                new FeatureLayer(polylineServiceFeatureTable),
                new FeatureLayer(pointServiceFeatureTable)
            };

            // Add each layer to the map as a static layer and a dynamic layer
            foreach (FeatureLayer layer in featureLayers)
            {
                // Add the static layer to the top map view
                layer.RenderingMode = FeatureRenderingMode.Static;
                MyStaticMapView.Map.OperationalLayers.Add(layer);

                // Add the dynamic layer to the bottom map view
                FeatureLayer dynamicLayer = (FeatureLayer)layer.Clone();
                dynamicLayer.RenderingMode = FeatureRenderingMode.Dynamic;
                MyDynamicMapView.Map.OperationalLayers.Add(dynamicLayer);
            }

            // Set the view point of both MapViews.
            MyStaticMapView.SetViewpoint(_zoomOutPoint);
            MyDynamicMapView.SetViewpoint(_zoomOutPoint);
        }

        private async void OnZoomClick(object sender, Windows.UI.Xaml.RoutedEventArgs e)
        {
            try
            {
                // Initiate task to zoom both map views in.  
                Task t1 = MyStaticMapView.SetViewpointAsync(_zoomInPoint, TimeSpan.FromSeconds(5));
                Task t2 = MyDynamicMapView.SetViewpointAsync(_zoomInPoint, TimeSpan.FromSeconds(5));
                await Task.WhenAll(t1, t2);

                // Delay start of next set of zoom tasks.
                await Task.Delay(2000);

                // Initiate task to zoom both map views out. 
                Task t3 = MyStaticMapView.SetViewpointAsync(_zoomOutPoint, TimeSpan.FromSeconds(5));
                Task t4 = MyDynamicMapView.SetViewpointAsync(_zoomOutPoint, TimeSpan.FromSeconds(5));
                await Task.WhenAll(t3, t4);
            }
            catch (Exception ex)
            {
                await new MessageDialog(ex.ToString(), "Error").ShowAsync();
            }
        }
    }
}