QT制作一个钟表

效果图：

废话不多说直接上源码：
clock.h

#ifndef CLOCK_H
#define CLOCK_H

#include <QWidget>
#include <QPixmap>
#include <QBitmap>
#include <QPainter>
#include <QPaintEvent>
#include <QTime>
#include <QPaintEvent>
#include <QPainter>
#include <QTimer>
#include <QPen>
#include <QFont>

class Widget : public QWidget
{
    Q_OBJECT

public:
    Widget(QWidget *parent = nullptr);
    ~Widget();
    void mousePressEvent(QMouseEvent *event);
    void mouseMoveEvent(QMouseEvent *event);

private:
    QPixmap pix;
    QPoint dragPosition;
    static const QPoint hourHand[4];
    static const QPoint minuteHand[4];
    static const QPoint secondHand[4];
    QPen hourHandPen;
    QPen minuteHandPen;
    QFont font;

protected:
    void paintEvent(QPaintEvent *);
    void drawHourHand(QPainter *painter);
    void drawMinuteH