Statistical query

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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 // [WriteFile Name=StatisticalQuery, Category=Analysis] // [Legal] // Copyright 2017 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 "StatisticalQuery.h"  // ArcGIS Maps SDK headers #include "CoreTypes.h" #include "Error.h" #include "FeatureLayer.h" #include "Geometry.h" #include "LayerListModel.h" #include "Map.h" #include "MapQuickView.h" #include "MapTypes.h" #include "ServiceFeatureTable.h" #include "StatisticDefinition.h" #include "StatisticRecord.h" #include "StatisticRecordIterator.h" #include "StatisticsQueryParameters.h" #include "StatisticsQueryResult.h" #include "Viewpoint.h"  // Qt headers #include <QFuture> #include <QUrl> #include <QUuid>  // STL headers #include <memory>  using namespace Esri::ArcGISRuntime;  StatisticalQuery::StatisticalQuery(QQuickItem* parent /* = nullptr */):  QQuickItem(parent) { }  void StatisticalQuery::init() {  // Register the map view for QML  qmlRegisterType<MapQuickView>("Esri.Samples", 1, 0, "MapView");  qmlRegisterType<StatisticalQuery>("Esri.Samples", 1, 0, "StatisticalQuerySample"); }  void StatisticalQuery::componentComplete() {  QQuickItem::componentComplete();   // find QML MapView component  m_mapView = findChild<MapQuickView*>("mapView");   // Create a new Map with the world streets vector basemap  m_map = new Map(BasemapStyle::ArcGISStreets, this);   // Create feature table using the world cities URL  m_featureTable = new ServiceFeatureTable(QUrl("https://sampleserver6.arcgisonline.com/arcgis/rest/services/SampleWorldCities/MapServer/0"), this);   // Create a new feature layer to display features in the world cities table  FeatureLayer* featureLayer = new FeatureLayer(m_featureTable, this);  m_map->operationalLayers()->append(featureLayer);   // Set map to map view  m_mapView->setMap(m_map);   connect(m_featureTable, &ServiceFeatureTable::errorOccurred, this, [this](const Error& e)  {  if (e.isEmpty())  return;   emit showStatistics(e.message());  });  }  void StatisticalQuery::onQueryStatisticsCompleted_(StatisticsQueryResult* rawResult) {  if (!rawResult)  return;   // Delete rawResult when we leave local scope.  auto result = std::unique_ptr<StatisticsQueryResult>(rawResult);   // Iterate through the results  QObject parent;  QString resultText;  StatisticRecordIterator iter = result->iterator();  while (iter.hasNext())  {  StatisticRecord* record = iter.next(&parent);  const QVariantMap& statsMap = record->statistics();  for (auto it = statsMap.cbegin(); it != statsMap.cend(); ++it)  {  resultText += QString("%1: %2\n").arg(it.key(), it.value().toString());  }  }   // Display the Results  emit showStatistics(resultText); }  void StatisticalQuery::queryStatistics(bool extentOnly, bool bigCitiesOnly) {  // create the parameters  StatisticsQueryParameters queryParameters;   // Add the Statistic Definitions  QList<StatisticDefinition> definitions  {  StatisticDefinition("POP", StatisticType::Average, ""),  StatisticDefinition("POP", StatisticType::Minimum, ""),  StatisticDefinition("POP", StatisticType::Maximum, ""),  StatisticDefinition("POP", StatisticType::Sum, ""),  StatisticDefinition("POP", StatisticType::StandardDeviation, ""),  StatisticDefinition("POP", StatisticType::Variance, ""),  StatisticDefinition("POP", StatisticType::Count, "CityCount")  };  queryParameters.setStatisticDefinitions(definitions);   // If only using features in the current extent, set up the spatial filter for the statistics query parameters  if (extentOnly)  {  // Set the statistics query parameters geometry with the envelope  queryParameters.setGeometry(m_mapView->currentViewpoint(ViewpointType::BoundingGeometry).targetGeometry());   // Set the spatial relationship to Intersects (which is the default)  queryParameters.setSpatialRelationship(SpatialRelationship::Intersects);  }   // If only evaluating the largest cities (over 5 million in population), set up an attribute filter  if (bigCitiesOnly)  queryParameters.setWhereClause("POP_RANK = 1");   // Execute the statistical query with these parameters  m_featureTable->queryStatisticsAsync(queryParameters).then(this, [this](StatisticsQueryResult* rawResult)  {  onQueryStatisticsCompleted_(rawResult);  }); }