Map rotation

View inWPFUWPFormsiOSAndroid
View on GitHub

Rotate a map.

Image of map rotation

Use case

A user may wish to view the map in an orientation other than north-facing.

How to use the sample

Use the slider to rotate the map.

How it works

  1. Instantiate an Map object.
  2. Set the map in the MapView object.
  3. Use SetViewpointRotationAsync to indicate the rotation angle.

Relevant API

  • Map
  • Compass
  • MapView

Tags

rotate, rotation, viewpoint

Sample Code

MapRotation.cs
                                                                                                         
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
// Copyright 2021 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.Views;
using Android.Widget;
using Esri.ArcGISRuntime.Mapping;
using Esri.ArcGISRuntime.UI.Controls;

namespace ArcGISRuntime.Samples.MapRotation
{
    [Activity (ConfigurationChanges=Android.Content.PM.ConfigChanges.Orientation | Android.Content.PM.ConfigChanges.ScreenSize)]
    [ArcGISRuntime.Samples.Shared.Attributes.Sample(
        name: "Map rotation",
        category: "MapView",
        description: "Rotate a map.",
        instructions: "Use the slider to rotate the map.",
        tags: new[] { "rotate", "rotation", "viewpoint" })]
    public class MapRotation : Activity
    {
        // Hold a reference to the map view
        private MapView _myMapView;

        private TextView _mapRotationLabel;

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

            CreateLayout();
            Initialize();

            Title = "Map rotation";
        }

        private void Initialize()
        {
            // Create a new Map instance with the basemap
            Basemap myBasemap = new Basemap(BasemapStyle.ArcGISStreets);

            _myMapView.Map = new Map(myBasemap);
        }

        private void CreateLayout()
        {
            LinearLayout layout = new LinearLayout(this) { Orientation = Orientation.Vertical };

            // Create a slider (SeekBar) control for selecting an angle
            SeekBar angleSlider = new SeekBar(this)
            {
                // Set a maximum slider value (minimum is always 0)
                Max = 360,
                Progress = 0
            };

            // When the slider value (Progress) changes, rotate the map
            angleSlider.ProgressChanged += (s, e) =>
            {
                if (e.FromUser)
                {
                    // Set rotation asynchronously (no need to await the result)
                    _myMapView.SetViewpointRotationAsync(e.Progress);

                    // Display the MapView's rotation.
                    _mapRotationLabel.Text = $"{angleSlider.Progress:0}°";
                }
            };

            // Create a layout to show the slider and label
            LinearLayout sliderLayout = new LinearLayout(this)
            {
                Orientation = Orientation.Horizontal
            };
            sliderLayout.SetPadding(10, 10, 10, 10);
            angleSlider.LayoutParameters = new LinearLayout.LayoutParams(
                ViewGroup.LayoutParams.MatchParent,
                ViewGroup.LayoutParams.MatchParent,
                1.0f
            );
            _mapRotationLabel = new TextView(this);
            _mapRotationLabel.SetMaxWidth(150);
            _mapRotationLabel.SetMinWidth(150);
            sliderLayout.AddView(angleSlider);
            sliderLayout.AddView(_mapRotationLabel);

            // Display the MapView's initial rotation value.
            _mapRotationLabel.Text = $"{angleSlider.Progress:0}°";

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

            // Apply the layout to the app
            SetContentView(layout);
        }
    }
}

Your browser is no longer supported. Please upgrade your browser for the best experience. See our browser deprecation post for more details.