Analyze hotspots

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

// ArcGIS Maps SDK headers
#include "ArcGISMapImageLayer.h"
#include "Envelope.h"
#include "Error.h"
#include "GeoprocessingJob.h"
#include "GeoprocessingResult.h"
#include "GeoprocessingString.h"
#include "GeoprocessingTask.h"
#include "GeoprocessingTypes.h"
#include "LayerListModel.h"
#include "Map.h"
#include "MapQuickView.h"
#include "MapTypes.h"
#include "TaskTypes.h"

// Qt headers
#include <QFuture>

using namespace Esri::ArcGISRuntime;

AnalyzeHotspots::AnalyzeHotspots(QQuickItem* parent /* = nullptr */):
  QQuickItem(parent)
{
}

AnalyzeHotspots::~AnalyzeHotspots() = default;

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

void AnalyzeHotspots::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 Geoprocessing Task
  m_hotspotTask = new GeoprocessingTask(QUrl("https://sampleserver6.arcgisonline.com/arcgis/rest/services/911CallsHotspot/GPServer/911%20Calls%20Hotspot"), this);

  // Connect to the GP Task's errorOccurred signal
  connect(m_hotspotTask, &GeoprocessingTask::errorOccurred, this, [this](const Error& error)
  {
    emit displayErrorDialog("Geoprocessing Task failed", error.message());
  });
}

void AnalyzeHotspots::executeTaskWithDates(const QString& fromDate, const QString& toDate)
{
  // Create the GP Parameters
  GeoprocessingParameters hotspotParameters = createParameters(fromDate, toDate);

  // Create the GP Job and connect to the status signals
  GeoprocessingJob* job = m_hotspotTask->createJob(hotspotParameters);
  connect(job, &GeoprocessingJob::statusChanged, this, [this, job](JobStatus jobStatus)
  {
    switch (jobStatus)
    {
      case JobStatus::Failed:
        emit displayErrorDialog("Geoprocessing Task failed", !job->error().isEmpty() ? job->error().additionalMessage() : "Unknown error.");
        m_jobInProgress = false;
        m_jobStatus = "Job failed";
        break;
      case JobStatus::Started:
        m_jobInProgress = true;
        m_jobStatus = "Job in progress...";
        break;
      case JobStatus::Paused:
        m_jobInProgress = false;
        m_jobStatus = "Job paused...";
        break;
      case JobStatus::Succeeded:
        m_jobInProgress = false;
        m_jobStatus = "Job succeeded";
        // handle the results
        processResults(job->result());
        break;
      default:
        break;
    }

    // emit signals
    emit jobInProgressChanged();
    emit statusChanged();
  });

  // Start the job
  job->start();
  m_jobInProgress = true;
  emit jobInProgressChanged();
  m_jobStatus = "Job in progress...";
  emit statusChanged();
}

GeoprocessingParameters AnalyzeHotspots::createParameters(const QString& fromDate, const QString& toDate)
{
  // Create the GeoprocessingParameters and set the execution type
  GeoprocessingParameters hotspotParameters = GeoprocessingParameters(GeoprocessingExecutionType::AsynchronousSubmit);

  // create the query string
  QString queryString("(\"DATE\" > date '%1 00:00:00' AND \"DATE\" < date '%2 00:00:00')");
  queryString = queryString.arg(fromDate, toDate);

  // Add query that contains the date range and the days of the week that are used in analysis
  QMap<QString, GeoprocessingParameter*> inputs;
  inputs["Query"] = new GeoprocessingString(queryString, this);
  hotspotParameters.setInputs(inputs);

  // return the GeoprocessingParameters
  return hotspotParameters;
}

void AnalyzeHotspots::processResults(GeoprocessingResult* result)
{
  // Clear the map's operational layers
  m_mapView->map()->operationalLayers()->clear();

  // Extract the layer from the result and add to the map
  m_layer = result->mapImageLayer();
  connect(m_layer, &ArcGISMapImageLayer::doneLoading, this, [this](const Error& error)
  {
    if (error.isEmpty())
    {
      m_mapView->setViewpointGeometryAsync(m_layer->fullExtent());
    }
  });
  m_mapView->map()->operationalLayers()->append(m_layer);
}