Skip To Content ArcGIS for Developers Sign In Dashboard

ArcGIS Runtime SDK for .NET

Show magnifier

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

Tap and hold on a map to show a magnifier.

screenshot

Use case

Due to the limited screen size of some mobile devices, it may be difficult to identify individual features on a map where there is a high density of information, or the scale is very small. This can be the case when a mobile device is used for navigation, and the user wishes to magnify a particular area to better identify a road intersection.

How to use the sample

Tap and hold on the map to show a magnifier, then drag across the map to move the magnifier. You can also pan the map while holding the magnifier, by dragging the magnifier to the edge of the map.

How it works

  1. Create a new MapView, and add an Map to it.
  2. Enable the magnifier using mapView.MagnifierEnabled. This will set the magnifier to be shown on the Map when the user performs a long press gesture. Note: The default value is false.

Relevant API

  • Map
  • MapView
  • MapView.MagnifierEnabled

Additional information

This sample only works on a device with a touch screen. The magnifier will not appear via a mouse click.

Tags

magnify, map, zoom

Sample Code

<UserControl
    x:Class="ArcGISRuntime.UWP.Samples.ShowMagnifier.ShowMagnifier"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:esriControls="using:Esri.ArcGISRuntime.UI.Controls">
    <Grid>
        <esriControls:MapView x:Name="MyMapView" />
        <Border Style="{StaticResource BorderStyle}">
            <TextBlock Text="Tap and hold to show the magnifier. Note: This only works on touchscreen devices."
                       TextAlignment="Left" TextWrapping="Wrap"
                       FontWeight="SemiBold" />
        </Border>
    </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.Mapping;
using Esri.ArcGISRuntime.UI;

namespace ArcGISRuntime.UWP.Samples.ShowMagnifier
{
    [ArcGISRuntime.Samples.Shared.Attributes.Sample(
        "Show magnifier",
        "MapView",
        "This sample demonstrates how you can tap and hold on a map to get the magnifier. You can also pan while tapping and holding to move the magnifier across the map.",
        "This sample only works on a device with a touch screen. The magnifier will not appear via a mouse click.")]
    public partial class ShowMagnifier
    {
        public ShowMagnifier()
        {
            InitializeComponent();

            Initialize();
        }

        private void Initialize()
        {
            // Create new Map with basemap and initial location
            Map myMap = new Map(BasemapType.Topographic, 34.056295, -117.195800, 10);

            // Enable magnifier
            MyMapView.InteractionOptions = new MapViewInteractionOptions
            {
                IsMagnifierEnabled = true
            };

            // Assign the map to the MapView
            MyMapView.Map = myMap;
        }
    }
}