Read a GeoPackage

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
// [WriteFile Name=ReadGeoPackage, Category=Maps]
// [Legal]
// Copyright 2018 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 "ReadGeoPackage.h"

// ArcGIS Maps SDK headers
#include "Error.h"
#include "FeatureLayer.h"
#include "FeatureTable.h"
#include "GeoPackage.h"
#include "GeoPackageFeatureTable.h"
#include "GeoPackageRaster.h"
#include "Layer.h"
#include "LayerListModel.h"
#include "Map.h"
#include "MapQuickView.h"
#include "MapTypes.h"
#include "RasterLayer.h"

// Qt headers
#include <QFuture>
#include <QStandardPaths>
#include <QtCore/qglobal.h>

using namespace Esri::ArcGISRuntime;

// helper method to get cross platform data path
namespace
{
  QString defaultDataPath()
  {
    QString dataPath;

  #ifdef Q_OS_IOS
    dataPath = QStandardPaths::writableLocation(QStandardPaths::DocumentsLocation);
  #else
    dataPath = QStandardPaths::writableLocation(QStandardPaths::HomeLocation);
  #endif

    return dataPath;
  }
} // namespace

ReadGeoPackage::ReadGeoPackage(QQuickItem* parent /* = nullptr */):
  QQuickItem(parent),
  m_dataPath(defaultDataPath() + "/ArcGIS/Runtime/Data")
{
}

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

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

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

  // Create a map using the topographic basemap
  m_map = new Map(BasemapStyle::ArcGISTopographic, this);

  // Set map to map view
  m_mapView->setMap(m_map);

  // Create the initial view area
  const Viewpoint initialViewpoint(39.7294, -104.8319, 500000);
  m_mapView->setViewpointAsync(initialViewpoint);

  // Initialize the read operation
  readGeoPackage();
}

// Read the GeoPackage and create lists for the names and layer data
void ReadGeoPackage::readGeoPackage()
{
  // Load the GeoPackage at the beginning
  GeoPackage* auroraGpkg = new GeoPackage(m_dataPath + "/gpkg/AuroraCO.gpkg", this);

  // Make sure there are no errors in loading the GeoPackage before interacting with it
  connect(auroraGpkg, &GeoPackage::doneLoading, this, [auroraGpkg, this](const Error& error)
  {
    if (error.isEmpty())
    {
      // For each raster, create a raster layer and add the layer to the map
      const auto rasters = auroraGpkg->geoPackageRasters();
      for (GeoPackageRaster* rasterItm : rasters)
      {
        RasterLayer* rasterLyr = new RasterLayer(rasterItm, this);
        rasterLyr->setOpacity(0.55f);
        m_map->operationalLayers()->append(rasterLyr);
      }

      // For each feature table, create a feature layer and add the layer to the map
      const auto tables = auroraGpkg->geoPackageFeatureTables();
      for (GeoPackageFeatureTable* featureTbl : tables)
      {
        FeatureLayer* layer = new FeatureLayer(featureTbl, this);
        m_map->operationalLayers()->append(layer);
      }
    }
  });

  auroraGpkg->load();
}