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ArcGIS Runtime SDK for .NET

Render picture markers

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

Use pictures for markers.

screenshot

Use case

When marking geoelements on a map, using custom, unique symbols can be helpful for highlighting and differentiating between locations. For example, a tourism office may use pictures of landmarks as symbols on an online map or app, to help prospective visitors to orient themselves more easily around a city.

How to use the sample

When launched, this sample displays a map with some picture marker symbols. Pan and zoom to explore the map.

How it works

  1. Create a PictureMarkerSymbol using the URI to an online or local image or a JavaFX Image (platform dependent).
  2. Create a Graphic and set its symbol to the picture marker symbol.

Relevant API

  • PictureMarkerSymbol

About the data

The picture marker symbols in this sample are all constructed from different types of resources:

Tags

graphics, marker, picture, symbol, visualization

Sample Code

<UserControl
    x:Class="ArcGISRuntime.UWP.Samples.RenderPictureMarkers.RenderPictureMarkers"
    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:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    xmlns:esriUI="using:Esri.ArcGISRuntime.UI.Controls"
    mc:Ignorable="d"
    d:DesignHeight="300"
    d:DesignWidth="400">

    <Grid>
        <esriUI:MapView x:Name="MyMapView"/>
    </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.Geometry;
using Esri.ArcGISRuntime.Mapping;
using Esri.ArcGISRuntime.Symbology;
using Esri.ArcGISRuntime.UI;
using System;
using System.IO;
using System.Reflection;
using System.Threading.Tasks;
using Windows.UI.Popups;

namespace ArcGISRuntime.UWP.Samples.RenderPictureMarkers
{
    [ArcGISRuntime.Samples.Shared.Attributes.Sample(
        "Render picture markers",
        "Symbology",
        "This sample demonstrates how to create picture marker symbols from a URL and embedded resources.",
        "")]
    [ArcGISRuntime.Samples.Shared.Attributes.EmbeddedResource(@"PictureMarkerSymbols\pin_star_blue.png")]
    public sealed partial class RenderPictureMarkers
    {
        public RenderPictureMarkers()
        {
            InitializeComponent();

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

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

            // Create and set initial map area
            Envelope initialLocation = new Envelope(
                -229835, 6550763, -222560, 6552021,
                SpatialReferences.WebMercator);
            myMap.InitialViewpoint = new Viewpoint(initialLocation);

            // Assign the 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);

            // Add graphics using different source types
            CreatePictureMarkerSymbolFromUrl(overlay);
            try
            {
                await CreatePictureMarkerSymbolFromResources(overlay);
            }
            catch (Exception e)
            {
                await new MessageDialog(e.ToString(), "Error").ShowAsync();
            }
        }

        private void CreatePictureMarkerSymbolFromUrl(GraphicsOverlay overlay)
        {
            // Create uri to the used image
            Uri symbolUri = new Uri(
                "https://sampleserver6.arcgisonline.com/arcgis/rest/services/Recreation/FeatureServer/0/images/e82f744ebb069bb35b234b3fea46deae");

            // Create new symbol using asynchronous factory method from uri.
            PictureMarkerSymbol campsiteSymbol = new PictureMarkerSymbol(symbolUri)
            {
                Width = 40,
                Height = 40
            };

            // Create location for the campsite
            MapPoint campsitePoint = new MapPoint(-223560, 6552021, SpatialReferences.WebMercator);

            // Create graphic with the location and symbol
            Graphic campsiteGraphic = new Graphic(campsitePoint, campsiteSymbol);

            // Add graphic to the graphics overlay
            overlay.Graphics.Add(campsiteGraphic);
        }

        private async Task CreatePictureMarkerSymbolFromResources(GraphicsOverlay overlay)
        {
            // Get current assembly that contains the image
            Assembly currentAssembly = GetType().GetTypeInfo().Assembly;

            // Get image as a stream from the resources
            // Picture is defined as EmbeddedResource and DoNotCopy
            Stream resourceStream = currentAssembly.GetManifestResourceStream(
                "ArcGISRuntime.Resources.PictureMarkerSymbols.pin_star_blue.png");

            // Create new symbol using asynchronous factory method from stream
            PictureMarkerSymbol pinSymbol = await PictureMarkerSymbol.CreateAsync(resourceStream);
            pinSymbol.Width = 50;
            pinSymbol.Height = 50;

            // Create location for the pint
            MapPoint pinPoint = new MapPoint(-226773, 6550477, SpatialReferences.WebMercator);

            // Create graphic with the location and symbol
            Graphic pinGraphic = new Graphic(pinPoint, pinSymbol);

            // Add graphic to the graphics overlay
            overlay.Graphics.Add(pinGraphic);
        }
    }
}