selectionbeaconoverlay.h

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#ifndef OPENSWMMVIS_MAP_SELECTIONBEACONOVERLAY_H
#define OPENSWMMVIS_MAP_SELECTIONBEACONOVERLAY_H
 
#include <QColor>
#include <QElapsedTimer>
#include <QObject>
#include <QPointF>
#include <QTimer>
#include <QVector>
 
#include <functional>
 
class QPainter;
 
namespace SelectionBeacon {
inline constexpr int    kBeaconRadiusPx = 14;   
inline constexpr int    kFlashMaxRadiusPx = 46; 
inline constexpr int    kFlashDurationMs  = 800;
inline constexpr int    kFlashFrameMs     = 33; 
inline constexpr int    kMaxBeacons       = 250;
}
 
class SelectionBeaconOverlay : public QObject
{
    Q_OBJECT
 
public:
    explicit SelectionBeaconOverlay(QObject *parent = nullptr);
 
    void setAnchors(const QVector<QPointF> &sceneAnchors);
 
    [[nodiscard]] bool isEmpty() const { return m_anchors.isEmpty(); }
 
    void setColor(const QColor &c);
 
    void paint(QPainter &p,
               const std::function<QPointF(const QPointF &)> &toPixel,
               const QSize &viewport);
 
signals:
    void needsRepaint();
 
private:
    [[nodiscard]] double flashProgress() const;
 
    QVector<QPointF> m_anchors;
    QColor           m_color = QColor(255, 200, 0);
    QElapsedTimer    m_flashClock;
    bool             m_flashing = false;
    QTimer           m_frameTimer;
};
 
#endif // OPENSWMMVIS_MAP_SELECTIONBEACONOVERLAY_H