WimaPlaner.cc 25 KB
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#include "WimaPlaner.h"
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#include "MissionController.h"
#include "MissionSettingsItem.h"
#include "PlanMasterController.h"
#include "QGCApplication.h"
#include "QGCMapPolygon.h"
#include "SimpleMissionItem.h"
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#include "Geometry/GeoUtilities.h"
#include "Geometry/PlanimetryCalculus.h"
#include "OptimisationTools.h"
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#include "CircularSurvey.h"
#include "Geometry/WimaArea.h"
#include "Geometry/WimaAreaData.h"
#include "WimaBridge.h"
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const char *WimaPlaner::wimaFileExtension = "wima";
const char *WimaPlaner::areaItemsName = "AreaItems";
const char *WimaPlaner::missionItemsName = "MissionItems";
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WimaPlaner::WimaPlaner(QObject *parent)
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    : QObject(parent), _masterController(nullptr), _missionController(nullptr),
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      _currentAreaIndex(-1), _wimaBridge(nullptr), _mAreaChanged(true),
      _sAreaChanged(true), _corridorChanged(true), _joinedArea(this),
      _arrivalPathLength(0), _returnPathLength(0), _TSComplexItem(nullptr),
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      _surveyChanged(true), _synchronized(false), _needsUpdate(true) {
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  connect(this, &WimaPlaner::currentPolygonIndexChanged, this,
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          &WimaPlaner::updatePolygonInteractivity);
  connect(&this->_measurementArea, &WimaArea::pathChanged, [this] {
    this->_mAreaChanged = true;
    this->setNeedsUpdate(true);
  });
  connect(&this->_serviceArea, &WimaArea::pathChanged, [this] {
    this->_sAreaChanged = true;
    this->setNeedsUpdate(true);
  });
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  connect(&this->_serviceArea, &WimaServiceArea::depotChanged, [this] {
    this->_sAreaChanged = true;
    this->setNeedsUpdate(true);
  });
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  connect(&this->_corridor, &WimaArea::pathChanged, [this] {
    this->_corridorChanged = true;
    this->setNeedsUpdate(true);
  });
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#ifndef NDEBUG
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  // for debugging and testing purpose, remove if not needed anymore
  connect(&_autoLoadTimer, &QTimer::timeout, this,
          &WimaPlaner::autoLoadMission);
  _autoLoadTimer.setSingleShot(true);
  _autoLoadTimer.start(300);
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#endif
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}
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PlanMasterController *WimaPlaner::masterController() {
  return _masterController;
}

MissionController *WimaPlaner::missionController() {
  return _missionController;
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}

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QmlObjectListModel *WimaPlaner::visualItems() { return &_visualItems; }
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int WimaPlaner::currentPolygonIndex() const { return _currentAreaIndex; }

QString WimaPlaner::currentFile() const { return _currentFile; }

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QStringList WimaPlaner::loadNameFilters() const {
  QStringList filters;
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  filters << tr("Supported types (*.%1 *.%2)")
                 .arg(wimaFileExtension)
                 .arg(AppSettings::planFileExtension)
          << tr("All Files (*.*)");
  return filters;
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}

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QStringList WimaPlaner::saveNameFilters() const {
  QStringList filters;
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  filters << tr("Supported types (*.%1 *.%2)")
                 .arg(wimaFileExtension)
                 .arg(AppSettings::planFileExtension);
  return filters;
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}

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QString WimaPlaner::fileExtension() const { return wimaFileExtension; }

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QGeoCoordinate WimaPlaner::joinedAreaCenter() const {
  return _joinedArea.center();
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}

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WimaBridge *WimaPlaner::wimaBridge() { return _wimaBridge; }

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void WimaPlaner::setMasterController(PlanMasterController *masterC) {
  _masterController = masterC;
  emit masterControllerChanged();
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}

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void WimaPlaner::setMissionController(MissionController *missionC) {
  _missionController = missionC;
  emit missionControllerChanged();
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}

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void WimaPlaner::setCurrentPolygonIndex(int index) {
  if (index >= 0 && index < _visualItems.count() &&
      index != _currentAreaIndex) {
    _currentAreaIndex = index;
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    emit currentPolygonIndexChanged(index);
  }
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}

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void WimaPlaner::setWimaBridge(WimaBridge *bridge) {
  if (bridge != nullptr) {
    _wimaBridge = bridge;
    emit wimaBridgeChanged();
  }
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}

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bool WimaPlaner::synchronized() { return _synchronized; }
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bool WimaPlaner::needsUpdate() { return _needsUpdate; }
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WimaPlaner *WimaPlaner::thisPointer() { return this; }
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void WimaPlaner::removeArea(int index) {
  if (index >= 0 && index < _visualItems.count()) {
    WimaArea *area = qobject_cast<WimaArea *>(_visualItems.removeAt(index));
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    if (area == nullptr) {
      qWarning("WimaPlaner::removeArea(): nullptr catched, internal error.");
      return;
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    }
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    area->clear();
    area->borderPolygon()->clear();
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    emit visualItemsChanged();
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    if (_visualItems.count() == 0) {
      // this branch is reached if all items are removed
      // to guarentee proper behavior, _currentAreaIndex must be set to a
      // invalid value, as on constructor init.
      resetAllInteractive();
      _currentAreaIndex = -1;
      return;
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    }

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    if (_currentAreaIndex >= _visualItems.count()) {
      setCurrentPolygonIndex(_visualItems.count() - 1);
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    } else {
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      updatePolygonInteractivity(_currentAreaIndex);
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    }
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  } else {
    qWarning("Index out of bounds!");
  }
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}

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bool WimaPlaner::addMeasurementArea() {
  if (!_visualItems.contains(&_measurementArea)) {
    _visualItems.append(&_measurementArea);
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    int newIndex = _visualItems.count() - 1;
    setCurrentPolygonIndex(newIndex);
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    emit visualItemsChanged();
    return true;
  } else {
    return false;
  }
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}

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bool WimaPlaner::addServiceArea() {
  if (!_visualItems.contains(&_serviceArea)) {
    _visualItems.append(&_serviceArea);
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    int newIndex = _visualItems.count() - 1;
    setCurrentPolygonIndex(newIndex);
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    emit visualItemsChanged();
    return true;
  } else {
    return false;
  }
}
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bool WimaPlaner::addCorridor() {
  if (!_visualItems.contains(&_corridor)) {
    _visualItems.append(&_corridor);
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    int newIndex = _visualItems.count() - 1;
    setCurrentPolygonIndex(newIndex);
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    emit visualItemsChanged();
    return true;
  } else {
    return false;
  }
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}

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void WimaPlaner::removeAll() {
  bool changesApplied = false;
  while (_visualItems.count() > 0) {
    removeArea(0);
    changesApplied = true;
  }
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  _missionController->removeAll();
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  _currentFile = "";
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  _TSComplexItem = nullptr;
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  emit currentFileChanged();
  if (changesApplied)
    emit visualItemsChanged();
}
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bool WimaPlaner::update() {
  this->_synchronized = false;
  emit synchronizedChanged();

  // ====================== update joined area ======================
  // check if at least service area and measurement area are available
  if (_visualItems.indexOf(&_serviceArea) == -1 ||
      _visualItems.indexOf(&_measurementArea) == -1)
    return false;

  // Check if polygons have at least three vertices
  if (_serviceArea.count() < 3) {
    qgcApp()->showMessage(tr("Service area has less than three vertices."));
    return false;
  }

  if (_measurementArea.count() < 3) {
    qgcApp()->showMessage(tr("Measurement area has less than three vertices."));
    return false;
  }

  // Check for simple polygons
  if (!_serviceArea.isSimplePolygon()) {
    qgcApp()->showMessage(tr("Service area is not a simple polygon. "
                             "Only simple polygons allowed.\n"));
    return false;
  }
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  if (!_corridor.isSimplePolygon() && _corridor.count() > 0) {
    qgcApp()->showMessage(tr("Corridor is not a simple polygon. Only "
                             "simple polygons allowed.\n"));
    return false;
  }
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  if (!_measurementArea.isSimplePolygon()) {
    qgcApp()->showMessage(tr("Measurement area is not a simple "
                             "polygon. Only simple polygons allowed.\n"));
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    return false;
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  }

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  if (!_serviceArea.containsCoordinate(_serviceArea.depot())) {
    qgcApp()->showMessage(tr("Depot not inside service area."));
    return false;
  }

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  // Join areas.
  bool jAreaChanged =
      this->_mAreaChanged || this->_sAreaChanged || this->_corridorChanged;
  if (jAreaChanged) {
    _joinedArea.setPath(_serviceArea.path());
    if (_corridor.count() >= 3) {
      _joinedArea.join(_corridor);
    }
    if (!_joinedArea.join(_measurementArea)) {
      qgcApp()->showMessage(
          tr("Not able to join areas. Service and measurement area"
             " must be overlapping, or connected through a "
             "corridor."));
      return false;
    }
  }
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  // ===========================================================
  // ====================== update survey ======================
  bool updateSurveyArea = jAreaChanged;
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  // extract old survey data
  QmlObjectListModel *missionItems = _missionController->visualItems();
  int surveyIndex = missionItems->indexOf(_TSComplexItem);
  // create survey item if not yet present
  if (surveyIndex == -1) {
    _missionController->insertComplexMissionItem(
        _missionController->circularSurveyComplexItemName(),
        _measurementArea.center(), missionItems->count());
    _TSComplexItem = qobject_cast<CircularSurvey *>(
        missionItems->get(missionItems->count() - 1));
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    if (_TSComplexItem == nullptr) {
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      qWarning("WimaPlaner::update(): survey == nullptr");
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      return false;
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    }

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    // establish connections
    _TSComplexItem->setRefPoint(_measurementArea.center());
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    _TSComplexItem->setHidePolygon(true);
    connect(_TSComplexItem, &CircularSurvey::missionItemReady, [this] {
      this->_surveyChanged = true;
      this->setNeedsUpdate(true);
    });
    updateSurveyArea = true;
  }

  if (updateSurveyArea) {
    // update survey area
    _TSComplexItem->surveyAreaPolygon()->clear();
    _TSComplexItem->surveyAreaPolygon()->appendVertices(
        _measurementArea.coordinateList());
    _TSComplexItem->setDepot(this->_serviceArea.depot());
    _TSComplexItem->setSafeArea(this->_joinedArea.coordinateList());
    this->_mAreaChanged = false;
    this->_sAreaChanged = false;
    this->_corridorChanged = false;
  } else if (this->_surveyChanged) {

    // ==========================================================
    // ====================== update paths ======================

    surveyIndex = missionItems->indexOf(_TSComplexItem);

    if (surveyIndex == -1) {
      qWarning("WimaPlaner::update(): no survey item");
      return false;
    }
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    // remove old arrival and return path
    int size = missionItems->count();
    for (int i = surveyIndex + 1; i < size; i++)
      _missionController->removeMissionItem(surveyIndex + 1);
    for (int i = surveyIndex - 1; i > 1; i--)
      _missionController->removeMissionItem(i);

    // set home position to serArea center
    MissionSettingsItem *settingsItem =
        qobject_cast<MissionSettingsItem *>(missionItems->get(0));
    if (settingsItem == nullptr) {
      qWarning("WimaPlaner::update(): settingsItem == nullptr");
      return false;
    }
    // set altitudes
    QGeoCoordinate point = _serviceArea.depot();
    point.setAltitude(0);
    _serviceArea.setDepot(point);
    point = _measurementArea.center();
    point.setAltitude(0);
    _measurementArea.setCenter(point);
    point = _corridor.center();
    point.setAltitude(0);
    _corridor.setCenter(point);
    settingsItem->setCoordinate(_serviceArea.depot());

    // set takeoff position
    bool setCommandNeeded = false;
    if (missionItems->count() < 3) {
      setCommandNeeded = true;
      _missionController->insertSimpleMissionItem(_serviceArea.depot(), 1);
    }
    SimpleMissionItem *takeOffItem =
        qobject_cast<SimpleMissionItem *>(missionItems->get(1));
    if (takeOffItem == nullptr) {
      qWarning("WimaPlaner::update(): takeOffItem == nullptr");
      return false;
    }
    if (setCommandNeeded)
      _missionController->setTakeoffCommand(*takeOffItem);
    takeOffItem->setCoordinate(_serviceArea.depot());
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    if (_TSComplexItem->visualTransectPoints().size() == 0) {
      qWarning("WimaPlaner::update(): survey no points.");
      return false;
    }

    // calculate path from take off to survey
    QGeoCoordinate start = _serviceArea.depot();
    QGeoCoordinate end = _TSComplexItem->coordinate();
#ifdef QT_DEBUG
// if (!_visualItems.contains(&_joinedArea))
//_visualItems.append(&_joinedArea);
#endif
    QVector<QGeoCoordinate> path;
    if (!shortestPath(start, end, path)) {
      qgcApp()->showMessage(QString(tr("Not able to calculate path from "
                                       "takeoff position to measurement area."))
                                .toLocal8Bit()
                                .data());
      return false;
    }
    _arrivalPathLength = path.size() - 1;
    int sequenceNumber = 0;
    for (int i = 1; i < path.count() - 1; i++) {
      sequenceNumber = _missionController->insertSimpleMissionItem(
          path[i], missionItems->count() - 1);
      _missionController->setCurrentPlanViewIndex(sequenceNumber, true);
    }

    // calculate return path
    start = _TSComplexItem->exitCoordinate();
    end = _serviceArea.depot();
    path.clear();
    if (!shortestPath(start, end, path)) {
      qgcApp()->showMessage(QString(tr("Not able to calculate the path from "
                                       "measurement area to landing position."))
                                .toLocal8Bit()
                                .data());
      return false;
    }
    _returnPathLength =
        path.size() - 1; // -1: fist item is last measurement point
    for (int i = 1; i < path.count() - 1; i++) {
      sequenceNumber = _missionController->insertSimpleMissionItem(
          path[i], missionItems->count());
      _missionController->setCurrentPlanViewIndex(sequenceNumber, true);
    }

    // create land position item
    sequenceNumber = _missionController->insertSimpleMissionItem(
        _serviceArea.depot(), missionItems->count());
    _missionController->setCurrentPlanViewIndex(sequenceNumber, true);
    SimpleMissionItem *landItem = qobject_cast<SimpleMissionItem *>(
        missionItems->get(missionItems->count() - 1));
    if (landItem == nullptr) {
      qWarning("WimaPlaner::calcArrivalAndReturnPath(): landItem == nullptr");
      return false;
    } else {
      if (!_missionController->setLandCommand(*landItem))
        return false;
    }
    this->_surveyChanged = false;
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    setNeedsUpdate(false);
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  }

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  return true;
}
void WimaPlaner::saveToCurrent() { saveToFile(_currentFile); }

void WimaPlaner::saveToFile(const QString &filename) {
  if (filename.isEmpty()) {
    return;
  }

  QString planFilename = filename;
  if (!QFileInfo(filename).fileName().contains(".")) {
    planFilename += QString(".%1").arg(wimaFileExtension);
  }

  QFile file(planFilename);
  if (!file.open(QIODevice::WriteOnly | QIODevice::Text)) {
    qgcApp()->showMessage(
        tr("Plan save error %1 : %2").arg(filename).arg(file.errorString()));
    _currentFile.clear();
    emit currentFileChanged();
  } else {
    FileType fileType = FileType::WimaFile;
    if (planFilename.contains(QString(".%1").arg(wimaFileExtension))) {
      fileType = FileType::WimaFile;
    } else if (planFilename.contains(
                   QString(".%1").arg(AppSettings::planFileExtension))) {
      fileType = FileType::PlanFile;
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    } else {
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      if (planFilename.contains(".")) {
        qgcApp()->showMessage(tr("File format not supported"));
      } else {
        qgcApp()->showMessage(tr("File without file extension not accepted."));
        return;
      }
    }
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    QJsonDocument saveDoc = saveToJson(fileType);
    file.write(saveDoc.toJson());
    if (_currentFile != planFilename) {
      _currentFile = planFilename;
      emit currentFileChanged();
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    }
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  }
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}

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bool WimaPlaner::loadFromCurrent() { return loadFromFile(_currentFile); }
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bool WimaPlaner::loadFromFile(const QString &filename) {
#define debug 0
  QString errorString;
  QString errorMessage =
      tr("Error loading Plan file (%1). %2").arg(filename).arg("%1");
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  if (filename.isEmpty()) {
    return false;
  }
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  QFileInfo fileInfo(filename);
  QFile file(filename);
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  if (!file.open(QIODevice::ReadOnly | QIODevice::Text)) {
    errorString = file.errorString() + QStringLiteral(" ") + filename;
    qgcApp()->showMessage(errorMessage.arg(errorString));
    return false;
  }
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  if (fileInfo.suffix() == wimaFileExtension) {
    QJsonDocument jsonDoc;
    QByteArray bytes = file.readAll();
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    if (!JsonHelper::isJsonFile(bytes, jsonDoc, errorString)) {
      qgcApp()->showMessage(errorMessage.arg(errorString));
      return false;
    }
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    QJsonObject json = jsonDoc.object();
    // AreaItems
    QJsonArray areaArray = json[areaItemsName].toArray();
    _visualItems.clear();
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    int validAreaCounter = 0;
    for (int i = 0; i < areaArray.size() && validAreaCounter < 3; i++) {
      QJsonObject jsonArea = areaArray[i].toObject();
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      if (jsonArea.contains(WimaArea::areaTypeName) &&
          jsonArea[WimaArea::areaTypeName].isString()) {
        if (jsonArea[WimaArea::areaTypeName] ==
            WimaMeasurementArea::WimaMeasurementAreaName) {
          bool success = _measurementArea.loadFromJson(jsonArea, errorString);
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          if (!success) {
            qgcApp()->showMessage(errorMessage.arg(errorString));
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            return false;
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          }

          validAreaCounter++;
          _visualItems.append(&_measurementArea);
          emit visualItemsChanged();
        } else if (jsonArea[WimaArea::areaTypeName] ==
                   WimaServiceArea::wimaServiceAreaName) {
          bool success = _serviceArea.loadFromJson(jsonArea, errorString);

          if (!success) {
            qgcApp()->showMessage(errorMessage.arg(errorString));
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            return false;
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          }

          validAreaCounter++;
          _visualItems.append(&_serviceArea);
          emit visualItemsChanged();
        } else if (jsonArea[WimaArea::areaTypeName] ==
                   WimaCorridor::WimaCorridorName) {
          bool success = _corridor.loadFromJson(jsonArea, errorString);

          if (!success) {
            qgcApp()->showMessage(errorMessage.arg(errorString));
            return false;
          }
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          validAreaCounter++;
          _visualItems.append(&_corridor);
          emit visualItemsChanged();
        } else {
          errorString +=
              QString(tr("%s not supported.\n").arg(WimaArea::areaTypeName));
          qgcApp()->showMessage(errorMessage.arg(errorString));
          return false;
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        }
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      } else {
        errorString += QString(tr("Invalid or non existing entry for %s.\n")
                                   .arg(WimaArea::areaTypeName));
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        return false;
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      }
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    }

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    _currentFile.sprintf("%s/%s.%s", fileInfo.path().toLocal8Bit().data(),
                         fileInfo.completeBaseName().toLocal8Bit().data(),
                         wimaFileExtension);
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    emit currentFileChanged();
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    QJsonObject missionObject = json[missionItemsName].toObject();
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    // qWarning() << json[missionItemsName].type();
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    QJsonDocument missionJsonDoc = QJsonDocument(missionObject);
    // create temporary file with missionItems
    QFile temporaryFile;
    QString cropedFileName = filename.section("/", 0, -2);
#if debug
    qWarning() << cropedFileName;
#endif
    QString temporaryFileName;
    for (int i = 0;; i++) {
      temporaryFileName =
          cropedFileName +
          QString("/temp%1.%2").arg(i).arg(AppSettings::planFileExtension);
      // qWarning() << temporaryFileName;

      if (!QFile::exists(temporaryFileName)) {
        temporaryFile.setFileName(temporaryFileName);
        if (temporaryFile.open(QIODevice::WriteOnly | QIODevice::Text)) {
          break;
        }
      }
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      if (i > 1000) {
        qWarning(
            "WimaPlaner::loadFromFile(): not able to create temporary file.");
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        return false;
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      }
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    }

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    // qWarning() << missionJsonDoc.toVariant().toString();
    temporaryFile.write(missionJsonDoc.toJson());
    temporaryFile.close();
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    // load from temporary file
    _masterController->loadFromFile(temporaryFileName);
    QmlObjectListModel *missionItems = _missionController->visualItems();
    _TSComplexItem = nullptr;
    for (int i = 0; i < missionItems->count(); i++) {
      _TSComplexItem = missionItems->value<CircularSurvey *>(i);
      if (_TSComplexItem != nullptr) {
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        _TSComplexItem->setHidePolygon(true);
        connect(_TSComplexItem, &CircularSurvey::missionItemReady, [this] {
          this->_surveyChanged = true;
          this->setNeedsUpdate(true);
        });
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        break;
      }
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    }

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    if (!update())
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      return false;
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    // remove temporary file
    if (!temporaryFile.remove()) {
      qWarning(
          "WimaPlaner::loadFromFile(): not able to remove temporary file.");
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    }

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    this->_synchronized = false;
    emit synchronizedChanged();
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    return true;
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  } else if (fileInfo.suffix() == AppSettings::planFileExtension) {
    _masterController->loadFromFile(filename);
    return true; // might be wrong return value
  } else {
    errorString += QString(tr("File extension not supported.\n"));
    qgcApp()->showMessage(errorMessage.arg(errorString));
    return false;
  }
}

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void WimaPlaner::updatePolygonInteractivity(int index) {
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  if (index >= 0 && index < _visualItems.count()) {
    resetAllInteractive();
    WimaArea *interactivePoly =
        qobject_cast<WimaArea *>(_visualItems.get(index));
    if (interactivePoly != nullptr)
      interactivePoly->setWimaAreaInteractive(true);
  }
}

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void WimaPlaner::synchronize() {
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  if (_wimaBridge != nullptr) {
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    if (_needsUpdate)
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      return;
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    auto planData = toPlanData();
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    (void)_wimaBridge->setWimaPlanData(planData);
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    this->_synchronized = true;
    emit synchronizedChanged();
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  } else {
    qWarning("WimaPlaner::uploadToContainer(): no container assigned.");
  }
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}

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bool WimaPlaner::shortestPath(const QGeoCoordinate &start,
                              const QGeoCoordinate &destination,
                              QVector<QGeoCoordinate> &path) {
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  using namespace GeoUtilities;
  using namespace PolygonCalculus;
  QPolygonF polygon2D;
  toCartesianList(_joinedArea.coordinateList(), /*origin*/ start, polygon2D);
  QPointF start2D(0, 0);
  QPointF end2D;
  QVector<QPointF> path2D;
  toCartesian(destination, start, end2D);
  bool retVal =
      PolygonCalculus::shortestPath(polygon2D, start2D, end2D, path2D);
  toGeoList(path2D, /*origin*/ start, path);

  return retVal;
}

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void WimaPlaner::setNeedsUpdate(bool needsUpdate) {
  if (this->_needsUpdate != needsUpdate) {
    this->_needsUpdate = needsUpdate;
    emit needsUpdateChanged();
  }
}

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void WimaPlaner::resetAllInteractive() {
  // Marks all areas as inactive (area.interactive == false)
  int itemCount = _visualItems.count();
  if (itemCount > 0) {
    for (int i = 0; i < itemCount; i++) {
      WimaArea *iteratorPoly = qobject_cast<WimaArea *>(_visualItems.get(i));
      iteratorPoly->setWimaAreaInteractive(false);
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    }
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  }
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}

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void WimaPlaner::setInteractive() {
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  updatePolygonInteractivity(_currentAreaIndex);
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}

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/*!
 * \fn WimaPlanData WimaPlaner::toPlanData()
 *
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 * Returns a \c WimaPlanData object containing information about the current
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 * mission. The \c WimaPlanData object holds only the data which is relevant
 * for the \c WimaController class. Should only be called if update() was
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 * successful.
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 *
 * \sa WimaController, WimaPlanData
 */
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QSharedPointer<WimaPlanData> WimaPlaner::toPlanData() {
  QSharedPointer<WimaPlanData> planData(new WimaPlanData());
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  // store areas
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  planData->append(WimaMeasurementAreaData(_measurementArea));
  planData->append(WimaServiceAreaData(_serviceArea));
  planData->append(WimaCorridorData(_corridor));
  planData->append(WimaJoinedAreaData(_joinedArea));
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  // convert mission items to mavlink commands
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  QList<MissionItem *> missionItems;
  _TSComplexItem->appendMissionItems(missionItems, nullptr);
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  // store mavlink commands
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  qWarning() << "WimaPlaner";
  for (auto *item : missionItems) {
    qWarning() << item->coordinate();
  }
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  planData->append(missionItems);
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  return planData;
}

#ifndef NDEBUG
void WimaPlaner::autoLoadMission() {
  loadFromFile("/home/valentin/Desktop/drones/qgroundcontrol/Paths/"
               "KlingenbachTest.wima");
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  synchronize();
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}
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#endif
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QJsonDocument WimaPlaner::saveToJson(FileType fileType) {
  /// This function save all areas (of WimaPlaner) and all mission items (of
  /// MissionController) to a QJsonDocument
  /// @param fileType is either WimaFile or PlanFile (enum), if fileType ==
  /// PlanFile only mission items are stored
  QJsonObject json;
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  if (fileType == FileType::WimaFile) {
    QJsonArray jsonArray;
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    for (int i = 0; i < _visualItems.count(); i++) {
      QJsonObject json;
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      WimaArea *area = qobject_cast<WimaArea *>(_visualItems.get(i));
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      if (area == nullptr) {
        qWarning("WimaPlaner::saveToJson(): Internal error, area == nullptr!");
        return QJsonDocument();
      }
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      // check the type of area, create and append the JsonObject to the
      // JsonArray once determined
      WimaMeasurementArea *opArea = qobject_cast<WimaMeasurementArea *>(area);
      if (opArea != nullptr) {
        opArea->saveToJson(json);
        jsonArray.append(json);
        continue;
      }
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      WimaServiceArea *serArea = qobject_cast<WimaServiceArea *>(area);
      if (serArea != nullptr) {
        serArea->saveToJson(json);
        jsonArray.append(json);
        continue;
      }
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      WimaCorridor *corridor = qobject_cast<WimaCorridor *>(area);
      if (corridor != nullptr) {
        corridor->saveToJson(json);
        jsonArray.append(json);
        continue;
      }
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      // if non of the obove branches was trigger, type must be WimaArea
      area->saveToJson(json);
      jsonArray.append(json);
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    }

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    json[areaItemsName] = jsonArray;
    json[missionItemsName] = _masterController->saveToJson().object();
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    return QJsonDocument(json);
  } else if (fileType == FileType::PlanFile) {
    return _masterController->saveToJson();
  }
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  return QJsonDocument(json);
}