Show magnifier

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Tap and hold on a map to show a magnifier.

Image of show magnifier

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

ShowMagnifier.cs
                                                                             
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// 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 Android.App;
using Android.OS;
using Android.Widget;
using Esri.ArcGISRuntime.Mapping;
using Esri.ArcGISRuntime.UI.Controls;

namespace ArcGISRuntime.Samples.ShowMagnifier
{
    [Activity (ConfigurationChanges=Android.Content.PM.ConfigChanges.Orientation | Android.Content.PM.ConfigChanges.ScreenSize)]
    [ArcGISRuntime.Samples.Shared.Attributes.Sample(
        name: "Show magnifier",
        category: "MapView",
        description: "Tap and hold on a map to show a magnifier.",
        instructions: "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.",
        tags: new[] { "magnify", "map", "zoom" })]
    public class ShowMagnifier : Activity
    {
        // Hold a reference to the map view
        private MapView _myMapView;

        protected override void OnCreate(Bundle bundle)
        {
            base.OnCreate(bundle);

            Title = "Show magnifier";

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

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

            // Enable the ability to interact with the map view (including enabling the magnifier)
            _myMapView.InteractionOptions = new Esri.ArcGISRuntime.UI.MapViewInteractionOptions
            {
                // Enable magnifier
                IsMagnifierEnabled = true
            };

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

        private void CreateLayout()
        {
            // Create a new vertical layout for the app
            LinearLayout layout = new LinearLayout(this) { Orientation = Orientation.Vertical };

            // Create and add a help label
            TextView helpLabel = new TextView(this)
            {
                Text = "Tap and hold to show the magnifier. Note: This only works on touchscreen devices."
            };
            layout.AddView(helpLabel);

            // Add the map view to the layout
            _myMapView = new MapView(this);
            layout.AddView(_myMapView);

            // Show the layout in the app
            SetContentView(layout);
        }
    }
}

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