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Set initial map area | ArcGIS Maps SDK for Qt

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Display a map with a predefined initial extent.

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 of the initial map view.

1. Create a Envelope(xMin, yMin, xMax, yMax, SpatialReference).
2. Create a Viewpoint passing in the envelope.
3. Call setInitialViewpoint(viewpoint) on the Map to set the initial map area.

• 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

SetInitialMapArea.cpp SetInitialMapArea.cpp SetInitialMapArea.h SetInitialMapArea.qml

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

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

using namespace Esri::ArcGISRuntime;

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

SetInitialMapArea::~SetInitialMapArea() = default;

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

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

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

  // create a new basemap instance
  Basemap* basemap = new Basemap(BasemapStyle::ArcGISImageryStandard, this);
  // create a new map instance
  m_map = new Map(basemap, this);
  // set the initial viewpoint
  Envelope envelope(-12211308.778729, 4645116.003309, -12208257.879667, 4650542.535773, SpatialReference(102100));
  m_map->setInitialViewpoint(Viewpoint(envelope));
  // set map on the map view
  m_mapView->setMap(m_map);
}

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