maptoolmeasure.h

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#ifndef MAPTOOLMEASURE_H
#define MAPTOOLMEASURE_H
 
#include "map/tools/maptool.h"
#include "core/measurementunitmanager.h"
 
#include <QColor>
#include <QFont>
#include <QPointF>
#include <QVector>
 
class OpenSWMMVisWorkspace;
class OGRCoordinateTransformation;
 
enum class MeasureMode
{
    Distance, 
    Area,     
};
 
class OpenSWMMVisMapToolMeasure : public OpenSWMMVisMapTool
{
    Q_OBJECT
 
    Q_PROPERTY(MeasureMode mode READ mode WRITE setMode NOTIFY modeChanged)
    Q_PROPERTY(double      total READ total NOTIFY totalChanged)
 
public:
 
    explicit OpenSWMMVisMapToolMeasure(MapCanvas *canvas, QObject *parent = nullptr);
    ~OpenSWMMVisMapToolMeasure() override;
 
    [[nodiscard]] QCursor cursor() const override;
 
    // ----- Mode & units --------------------------------------------------
 
    [[nodiscard]] MeasureMode mode()  const;
    void setMode(MeasureMode mode);
 
    [[nodiscard]] MeasurementUnitManager::DistanceUnit distanceUnit() const;
    void setDistanceUnit(MeasurementUnitManager::DistanceUnit unit);
 
    [[nodiscard]] MeasurementUnitManager::AreaUnit areaUnit() const;
    void setAreaUnit(MeasurementUnitManager::AreaUnit unit);
 
    [[nodiscard]] double total() const;
 
    // ----- Actions -------------------------------------------------------
 
    void clearMeasurement();
 
    // ----- Tool interface ------------------------------------------------
 
    void activate()   override;
    void deactivate() override;
 
    void mousePressEvent(QMouseEvent *event)       override;
    void mouseMoveEvent(QMouseEvent *event)        override;
    void mouseDoubleClickEvent(QMouseEvent *event) override;
    void keyPressEvent(QKeyEvent *event)           override;
 
    void paint(QPainter *painter,
               const MapExtent &canvasExtent,
               const SpatialReferenceSystem *canvasSRS) override;
 
signals:
    void modeChanged(MeasureMode mode);
    void distanceUnitChanged(MeasurementUnitManager::DistanceUnit unit);
    void areaUnitChanged(MeasurementUnitManager::AreaUnit unit);
    void totalChanged(double total);
    void measurementCleared();
 
private:
    void recalculate();
    void rebuildTransform();
    void clearTransform();
    void applyPreferences();
 
    double geodesicDistance(const QPointF &a, const QPointF &b) const;
    double geodesicArea(const QVector<QPointF> &vertices) const;
 
    // Formats a metre value in the current distance unit: "142.30 m"
    QString formatDist(double metres) const;
    // Formats a square-metre value in the current area unit: "3 847.20 m²"
    QString formatArea(double sqm) const;
 
    MeasureMode        m_mode    = MeasureMode::Distance;
    MeasurementUnitManager::DistanceUnit m_distanceUnit = MeasurementUnitManager::Metres;
    MeasurementUnitManager::AreaUnit     m_areaUnit     = MeasurementUnitManager::SquareMetres;
 
    QVector<QPointF>   m_vertices;           
    QVector<double>    m_segmentMetres;       
    QPointF            m_mousePos;           
    double             m_total  = 0.0;
    bool               m_finalized = false;
 
    // Cached display preferences (updated via applyPreferences())
    QColor  m_lineColor   { Qt::red };
    QFont   m_labelFont   { QStringLiteral("sans-serif"), 8 };
    int     m_labelDecimals { 2 };
    QColor  m_fillColor   { 100, 149, 237 };
    int     m_fillOpacity { 30 };
 
    OGRCoordinateTransformation *m_toWgs84 = nullptr; 
};
 
#endif // MAPTOOLMEASURE_H