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Change basemap | ArcGIS Maps SDK for Qt

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Change a map's basemap. A basemap is beneath all layers on a Map and is used to provide visual reference for the operational layers.

Basemaps should be selected contextually, for example, in maritime applications, it would be more appropriate to use a basemap of the world's oceans as opposed to a basemap of the world's streets.

Press the Change Basemap button to display the Basemap Gallery. When the gallery appears, select a basemap to be displayed.

A basemap can be changed by setting the basemap property of a map object to a new basemap object (e.g. map->setBasemap(basemap);). However, this sample utilises the BasemapGallery toolkit component to manage this process and provide a common user experience. In this sample, the BasemapGallery creates a visual display of basemap options and automates the changing of the basemap.

1. Create a Map object.
2. Set the map to the MapView object.
3. Create a BasemapGallery from the toolkit.
4. Use the setGeoModelFromGeoView method to manage changes to the basemap.

• BasemapStyle
• Map
• MapView

This sample uses the BasemapGallery toolkit component and requires the toolkit to be cloned and set-up locally. For information about setting up the toolkit, see the repository's root README file.

basemap, map

ChangeBasemap.cpp ChangeBasemap.cpp ChangeBasemap.h ChangeBasemap.qml

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

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

// sample headers
#include "ChangeBasemap.h"

// ArcGIS Maps SDK headers
#include "Map.h"
#include "MapQuickView.h"
#include "MapTypes.h"

using namespace Esri::ArcGISRuntime;

ChangeBasemap::ChangeBasemap(QObject* parent /* = nullptr */):
  QObject(parent),
  m_map(new Map(BasemapStyle::ArcGISTopographic, this))
{
}

ChangeBasemap::~ChangeBasemap() = default;

void ChangeBasemap::init()
{
  // Register the map view for QML
  qmlRegisterType<MapQuickView>("Esri.Samples", 1, 0, "MapView");
  qmlRegisterType<ChangeBasemap>("Esri.Samples", 1, 0, "ChangeBasemapSample");
}

MapQuickView* ChangeBasemap::mapView() const
{
  return m_mapView;
}

// Set the view (created in QML)
void ChangeBasemap::setMapView(MapQuickView* mapView)
{
  if (!mapView || mapView == m_mapView)
    return;

  m_mapView = mapView;
  m_mapView->setMap(m_map);

  emit mapViewChanged();
}

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