Map rotation

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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
                                                                                                                         
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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 System;
using Esri.ArcGISRuntime.Mapping;
using Esri.ArcGISRuntime.UI.Controls;
using Foundation;
using UIKit;

namespace ArcGISRuntime.Samples.MapRotation
{
    [Register("MapRotation")]
    [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 : UIViewController
    {
        // Hold references to UI controls.
        private MapView _myMapView;
        private UILabel _rotationLabel;
        private UISlider _rotationSlider;

        public MapRotation()
        {
            Title = "Map rotation";
        }

        private void Initialize()
        {
            // Show a streets basemap.
            _myMapView.Map = new Map(BasemapStyle.ArcGISStreets);
        }

        private void RotationSlider_Changed(object sender, EventArgs e)
        {
            _myMapView.SetViewpointRotationAsync(_rotationSlider.Value);
            _rotationLabel.Text = $"{_rotationSlider.Value:0}°";
        }

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

        public override void LoadView()
        {
            // Create the views.
            View = new UIView {BackgroundColor = ApplicationTheme.BackgroundColor};

            _myMapView = new MapView();
            _myMapView.TranslatesAutoresizingMaskIntoConstraints = false;

            _rotationSlider = new UISlider
            {
                MinValue = 0,
                MaxValue = 360,
                TranslatesAutoresizingMaskIntoConstraints = false
            };

            _rotationLabel = new UILabel
            {
                Text = "0°",
                TextAlignment = UITextAlignment.Center,
                TranslatesAutoresizingMaskIntoConstraints = false
            };

            UIToolbar toolbar = new UIToolbar();
            toolbar.TranslatesAutoresizingMaskIntoConstraints = false;
            toolbar.Items = new[]
            {
                new UIBarButtonItem(_rotationLabel),
                new UIBarButtonItem(UIBarButtonSystemItem.FixedSpace) {Width = 0},
                new UIBarButtonItem(_rotationSlider)
            };

            // Add the views.
            View.AddSubviews(_myMapView, toolbar);

            // Lay out the views.
            NSLayoutConstraint.ActivateConstraints(new[]
            {
                _rotationLabel.WidthAnchor.ConstraintEqualTo(64),

                _myMapView.TopAnchor.ConstraintEqualTo(View.SafeAreaLayoutGuide.TopAnchor),
                _myMapView.LeadingAnchor.ConstraintEqualTo(View.LeadingAnchor),
                _myMapView.TrailingAnchor.ConstraintEqualTo(View.TrailingAnchor),
                _myMapView.BottomAnchor.ConstraintEqualTo(toolbar.TopAnchor),

                toolbar.LeadingAnchor.ConstraintEqualTo(View.LeadingAnchor),
                toolbar.TrailingAnchor.ConstraintEqualTo(View.TrailingAnchor),
                toolbar.BottomAnchor.ConstraintEqualTo(View.SafeAreaLayoutGuide.BottomAnchor)
            });
        }

        public override void ViewWillAppear(bool animated)
        {
            base.ViewWillAppear(animated);

            // Subscribe to events.
            _rotationSlider.ValueChanged += RotationSlider_Changed;
        }

        public override void ViewDidDisappear(bool animated)
        {
            base.ViewDidDisappear(animated);

            // Unsubscribe from events, per best practice.
            _rotationSlider.ValueChanged -= RotationSlider_Changed;
        }
    }
}

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