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Showing content from https://developers.arcgis.com/qt/cpp/sample-code/map-rotation/ below:

Map rotation | ArcGIS Maps SDK for Qt

View on GitHub Sample viewer app

Rotate a map.

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

Use the slider to rotate the map.

1. Create a Map object.
2. Set the map to a MapView object.
3. Use setViewpointRotation to indicate the rotation angle.

• Map
• MapView

rotate, rotation, viewpoint

MapRotation.cpp MapRotation.cpp MapRotation.h MapRotation.qml

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// [WriteFile Name=MapRotation, Category=Maps]
// [Legal]
// 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.
// [Legal]

#ifdef PCH_BUILD
#include "pch.hpp"
#endif // PCH_BUILD

// sample headers
#include "MapRotation.h"

// ArcGIS Maps SDK headers
#include "Basemap.h"
#include "Map.h"
#include "MapQuickView.h"
#include "MapTypes.h"
#include "Point.h"
#include "SpatialReference.h"
#include "Viewpoint.h"

// Qt headers
#include <QFuture>

using namespace Esri::ArcGISRuntime;

MapRotation::MapRotation(QQuickItem* parent) :
    QQuickItem(parent)
{
}

MapRotation::~MapRotation() = default;

void MapRotation::init()
{
  qmlRegisterType<MapQuickView>("Esri.Samples", 1, 0, "MapView");
  qmlRegisterType<MapRotation>("Esri.Samples", 1, 0, "MapRotationSample");
}

void MapRotation::componentComplete()
{
    QQuickItem::componentComplete();

    // find QML MapView component
    m_mapView = findChild<MapQuickView*>("mapView");

    // create a new basemap instance
    Basemap* basemap = new Basemap(BasemapStyle::ArcGISStreets, this);
    // create a new map instance and set the initial viewpoint
    m_map = new Map(basemap, this);
    Viewpoint initialViewpoint(Point(-11070722, 4658720, SpatialReference(102100)), 55151630);
    m_map->setInitialViewpoint(initialViewpoint);
    // set map on the map view
    m_mapView->setMap(m_map);
}

void MapRotation::setMapViewRotation(double degrees)
{
    m_mapView->setViewpointRotationAsync(degrees);
}

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