analogclock.h

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#ifndef ANALOGCLOCK_H
#define ANALOGCLOCK_H

#include <QWidget>
#include <QTime>

class AnalogClock : public QWidget
{
    Q_OBJECT
    Q_PROPERTY(QTime time READ time WRITE setTime)
    Q_PROPERTY(
        bool showSecondsHand READ showSecondsHand WRITE setShowSecondsHand)
    Q_PROPERTY(
        int utcOffset READ utcOffset WRITE setUtcOffset)
    Q_PROPERTY(bool showAmPm READ showAmPm WRITE setShowAmPm)

public:
    AnalogClock(QWidget *parent = nullptr);

    QTime time() const;
    bool showSecondsHand() const;
    int utcOffset() const;
    bool showAmPm() const;

    QSize sizeHint() const override {
        return QSize(200, 200);
    }

    QSize minimumSizeHint() const override {
        return QSize(109, 109);
    }

public slots:
    void setTime(const QTime &time);
    void setShowSecondsHand(bool showSecondsHand);
    bool setTimezone(int value);
    void setUtcOffset(int offset);
    void setShowAmPm(bool value);

protected:
    void paintEvent(QPaintEvent *event) override;
    void changeEvent(QEvent *) override;

private slots:
    void timerTimeout();

private:
    void paintWindowsVista(QPainter *painter);
    void paintWindows(QPainter *painter);
    void paintDefault(QPainter *painter);

    void paintImg(QPainter *painter, const QString &imgpath);
    void paintHourHand(QPainter *painter, const QPolygon &poly,
                       const QColor &color);
    void paintHourMarkers(QPainter *painter, const QLine &line,
                          const QColor &color);
    void paintMinuteHand(QPainter *painter, const QPolygon &poly,
                         const QColor &color);
    void paintMinuteMarkers(QPainter *painter, const QLine &line,
                            const QColor &color);
    void paintSecondsHand(QPainter *painter, const QPolygon &poly,
                          const QColor &color);
    void paintAmPm(QPainter *painter, int offset);

    QTime m_time;
    QString m_styleName;
    int m_utcOffset        = 0;
    bool m_showSecondsHand = true;
    bool m_showAmPm        = false;

    static int sysUtcOffset;
};

#endif