ShapeFileHelper.h

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#pragma once
 
#include <QtCore/QList>
#include <QtCore/QObject>
#include <QtPositioning/QGeoCoordinate>
#include <QtQmlIntegration/QtQmlIntegration>
 
class ShapeFileHelper : public QObject
{
    Q_OBJECT
    QML_ELEMENT
    QML_SINGLETON
    Q_PROPERTY(QStringList fileDialogKMLFilters         READ fileDialogKMLFilters       CONSTANT) 
    Q_PROPERTY(QStringList fileDialogKMLOrSHPFilters    READ fileDialogKMLOrSHPFilters  CONSTANT) 
 
public:
    static QStringList fileDialogKMLFilters();
    static QStringList fileDialogKMLOrSHPFilters();
 
    enum class ShapeType {
        Polygon,
        Polyline,
        Point,
        Error
    };
 
    static constexpr double kDefaultVertexFilterMeters = 5.0;
 
    static ShapeType determineShapeType(const QString &file, QString &errorString);
 
    static int getEntityCount(const QString &file, QString &errorString);
 
    static bool loadPolygonsFromFile(const QString &file, QList<QList<QGeoCoordinate>> &polygons, QString &errorString,
                                     double filterMeters = kDefaultVertexFilterMeters);
 
    static bool loadPolylinesFromFile(const QString &file, QList<QList<QGeoCoordinate>> &polylines, QString &errorString,
                                      double filterMeters = kDefaultVertexFilterMeters);
 
    static bool loadPointsFromFile(const QString &file, QList<QGeoCoordinate> &points, QString &errorString);
 
    static constexpr const char *kmlFileExtension = ".kml";
    static constexpr const char *shpFileExtension = ".shp";
 
private:
    enum class ShapeFileType {
        None,
        KML,
        SHP
    };
    static ShapeFileType _getShapeFileType(const QString &file, QString &errorString);
};