Render simple markers

This sample adds a point graphic to a graphics overlay symbolized with a red circle specified via a SimpleMarkerSymbol.

Simple marker symbol

Code

// 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.Geometry;
using Esri.ArcGISRuntime.Mapping;
using Esri.ArcGISRuntime.Symbology;
using Esri.ArcGISRuntime.UI;
using Esri.ArcGISRuntime.UI.Controls;
using Foundation;
using System.Drawing;
using UIKit;

namespace ArcGISRuntimeXamarin.Samples.RenderSimpleMarkers
{
    [Register("RenderSimpleMarkers")]
    public class RenderSimpleMarkers : UIViewController
    {
        // Constant holding offset where the MapView control should start
        private const int yPageOffset = 60;

        // Create and hold reference to the used MapView
        private MapView _myMapView = new MapView();

        public RenderSimpleMarkers()
        {
            Title = "Render simple markers";
        }

        public override void ViewDidLoad()
        {
            base.ViewDidLoad();

            // Create the UI, setup the control references and execute initialization 
            CreateLayout();
            Initialize();
        }

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

            base.ViewDidLayoutSubviews();
        }

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

            // Create initial map location and reuse the location for graphic
            MapPoint centralLocation = new MapPoint(-226773, 6550477, SpatialReferences.WebMercator);
            Viewpoint initialViewpoint = new Viewpoint(centralLocation, 7500);

            // Set initial viewpoint
            myMap.InitialViewpoint = initialViewpoint;

            // Provide used Map to the MapView
            _myMapView.Map = myMap;

            // Create overlay to where graphics are shown
            GraphicsOverlay overlay = new GraphicsOverlay();

            // Add created overlay to the MapView
            _myMapView.GraphicsOverlays.Add(overlay);

            // Create a simple marker symbol
            SimpleMarkerSymbol simpleSymbol = new SimpleMarkerSymbol()
            {
                Color = Color.Red,
                Size = 10,
                Style = SimpleMarkerSymbolStyle.Circle
            };

            // Add a new graphic with a central point that was created earlier
            Graphic graphicWithSymbol = new Graphic(centralLocation, simpleSymbol);
            overlay.Graphics.Add(graphicWithSymbol);
        }

        private void CreateLayout()
        {
            // Add MapView to the page
            View.AddSubviews(_myMapView);
        }
    }
}


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