meshprofileoverlay.h

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#ifndef MESH_PROFILE_OVERLAY_H
#define MESH_PROFILE_OVERLAY_H
 
#include <QPointF>
#include <QVector>
#include <functional>
 
class QPainter;
 
class MeshProfileOverlay
{
public:
    MeshProfileOverlay() = default;
 
    void setPolyline(const QVector<QPointF> &scenePolyline);
 
    void setArrowChainage(double chainage);
 
    using SceneToPixel = std::function<QPointF(const QPointF &)>;
 
    void paint(QPainter &p, const SceneToPixel &toPixel) const;
 
    // ── Geometry helpers (chainage ↔ scene point along the polyline) ──────
    [[nodiscard]] double  totalLength() const { return m_total; }
    [[nodiscard]] QPointF chainageToScene(double chainage) const;
    [[nodiscard]] double  nearestChainage(const QPointF &scenePt) const;
    [[nodiscard]] const QVector<QPointF> &polyline() const { return m_poly; }
 
private:
    QVector<QPointF>      m_poly;             
    QVector<double>       m_chain;            
    double                m_total = 0.0;
    double                m_arrowChainage = -1.0;  
};
 
#endif // MESH_PROFILE_OVERLAY_H