Feature Layer Rendering Mode (Map)

This sample demonstrates how to use load settings to set preferred rendering mode for feature layers, specifically static or dynamic rendering modes.

Feature layer rendering modes

Code

// 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.Data;
using Esri.ArcGISRuntime.Geometry;
using Esri.ArcGISRuntime.Mapping;
using Esri.ArcGISRuntime.UI.Controls;
using Foundation;
using System;
using System.Threading.Tasks;
using UIKit;

namespace ArcGISRuntimeXamarin.Samples.FeatureLayerRenderingModeMap
{
    [Register("FeatureLayerRenderingModeMap")]
    public class FeatureLayerRenderingModeMap : UIViewController
    {
        private MapView _myMapViewTop;
        private MapView _myMapViewBottom;

        private UIButton _zoomButton;

        private Viewpoint _zoomOutPoint;
        private Viewpoint _zoomInPoint;

        public FeatureLayerRenderingModeMap()
        {
            this.Title = "Feature Layer Rendering Mode (Map)";
        }
        
        public override void ViewDidLoad()
        {
            base.ViewDidLoad();

            // Create the layout
            CreateLayout();

            // Initialize the app
            Initialize();
        }

        public override void ViewDidLayoutSubviews()
        {
            // Setup the visual frame for the MapViews
            _myMapViewTop.Frame = new CoreGraphics.CGRect(0, 0, View.Bounds.Width, View.Bounds.Height/2);
            _myMapViewBottom.Frame = new CoreGraphics.CGRect(0, View.Bounds.Height / 2, View.Bounds.Width, View.Bounds.Height/2);

            base.ViewDidLayoutSubviews();
        }

        private  void Initialize()
        {
            // Viewpoint locations for map view to zoom in and out to.
            _zoomOutPoint = new Viewpoint(new MapPoint(-118.37, 34.46, SpatialReferences.Wgs84), 650000, 0);
            _zoomInPoint = new Viewpoint(new MapPoint(-118.45, 34.395, SpatialReferences.Wgs84), 50000, 90);

            // Set the Map property of both of the MapViews
            _myMapViewTop.Map = new Map();
            _myMapViewBottom.Map = new Map();

            // Set the top map to render all features in static rendering mode
            _myMapViewTop.Map.LoadSettings.PreferredPointFeatureRenderingMode = FeatureRenderingMode.Static;
            _myMapViewTop.Map.LoadSettings.PreferredPolylineFeatureRenderingMode = FeatureRenderingMode.Static;
            _myMapViewTop.Map.LoadSettings.PreferredPolygonFeatureRenderingMode = FeatureRenderingMode.Static;

            // Set the bottom map to render all features in dynamic rendering mode
            _myMapViewBottom.Map.LoadSettings.PreferredPointFeatureRenderingMode = FeatureRenderingMode.Dynamic;
            _myMapViewBottom.Map.LoadSettings.PreferredPolylineFeatureRenderingMode = FeatureRenderingMode.Dynamic;
            _myMapViewBottom.Map.LoadSettings.PreferredPolygonFeatureRenderingMode = FeatureRenderingMode.Dynamic;

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

            // Create feature layer from service feature tables.
            FeatureLayer pointFeatureLayer = new FeatureLayer(pointServiceFeatureTable);
            FeatureLayer polylineFeatureLayer = new FeatureLayer(polylineServiceFeatureTable);
            FeatureLayer polygonFeatureLayer = new FeatureLayer(polygonServiceFeatureTable);

            // Add each layer to top map.
            _myMapViewTop.Map.OperationalLayers.Add(pointFeatureLayer.Clone());
            _myMapViewTop.Map.OperationalLayers.Add(polylineFeatureLayer.Clone());
            _myMapViewTop.Map.OperationalLayers.Add(polygonFeatureLayer.Clone());

            // Add each layer to top map.
            _myMapViewBottom.Map.OperationalLayers.Add(pointFeatureLayer);
            _myMapViewBottom.Map.OperationalLayers.Add(polylineFeatureLayer);
            _myMapViewBottom.Map.OperationalLayers.Add(polygonFeatureLayer);

            // Set the view point of both MapViews.
            _myMapViewTop.SetViewpoint(_zoomOutPoint);
            _myMapViewBottom.SetViewpoint(_zoomOutPoint);
        }

        private void CreateLayout()
        {
            // Create and hold reference to the used MapView
            _myMapViewTop = new MapView();
            _myMapViewBottom = new MapView();

            // Add a button at the bottom to show webmap choices
            _zoomButton = new UIButton(UIButtonType.Custom)
            {
                Frame = new CoreGraphics.CGRect(
                    0, View.Bounds.Height - 40, View.Bounds.Width, 40),
                BackgroundColor = UIColor.White
            };

            // Create button to show map options
            _zoomButton.SetTitle("Zoom", UIControlState.Normal);
            _zoomButton.SetTitleColor(UIColor.Blue, UIControlState.Normal);
            _zoomButton.TouchUpInside += OnZoomClick;

            // Add MapView to the page
            View.AddSubviews(_myMapViewTop, _myMapViewBottom, _zoomButton);
        }

        private async void OnZoomClick(object sender, EventArgs e)
        {
            // Initiate task to zoom both map views in.  
            Task t1 = _myMapViewTop.SetViewpointAsync(_zoomInPoint, TimeSpan.FromSeconds(5));
            Task t2 = _myMapViewBottom.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 = _myMapViewTop.SetViewpointAsync(_zoomOutPoint, TimeSpan.FromSeconds(5));
            Task t4 = _myMapViewBottom.SetViewpointAsync(_zoomOutPoint, TimeSpan.FromSeconds(5));
            await Task.WhenAll(t3, t4);
        }
    }
}


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