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Set initial map location | ArcGIS Maps SDK for Qt

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Display a basemap centered at an initial location and scale.

You can set a map's initial location when you want to highlight a particular feature or area to establish the context.

When the map loads, note the specific location and scale of the initial map view.

1. Create a Map, specifying a basemap style, latitude and longitude in WGS84, and target scale.
2. Display the map in a map view.

• Basemap
• Map
• MapView

The map opens with satellite imagery of a guitar-shaped field in the Pampas region of north central Argentina.

basemap, center, envelope, extent, initial, lat, latitude, level of detail, location, LOD, long, longitude, scale, zoom level

SetInitialMapLocation.cpp SetInitialMapLocation.cpp SetInitialMapLocation.h SetInitialMapLocation.qml

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// [WriteFile Name=SetInitialMapLocation, 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 "SetInitialMapLocation.h"

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

using namespace Esri::ArcGISRuntime;

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

SetInitialMapLocation::~SetInitialMapLocation() = default;

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

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

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

  // Create a new map with the imagery basemap style enum and set its initial lat, long, and scale
  constexpr double lat = -33.867886;
  constexpr double lon = -63.985;
  constexpr double scale = 9027.977411;

  m_map = new Map(BasemapStyle::ArcGISImagery, this);
  m_map->setInitialViewpoint(Viewpoint(lat, lon, scale));
  // set map on the map view
  m_mapView->setMap(m_map);
}

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