clockwidget.h

#ifndef CLOCKWIDGET_H
#define CLOCKWIDGET_H
#include <QTime>
#include <QWidget>
 
namespace Ui {
class ClockWidget;
}
class QTimer;
 
class ClockWidget : public QWidget {
    Q_OBJECT
 
public:
    explicit ClockWidget(QWidget* parent = nullptr);
    ~ClockWidget();
public slots:
    void process_update_invokation(QTime clockTime);
 
protected:
    /* Yep, for the dynamic widgets, we have to, sadly, draw by ourselves */
    /* Entry for us to draw a clock */
 
    void paintEvent(QPaintEvent* _paintEvent) override;
    QSize sizeHint() const override;
 
private:
    // Constants
    static constexpr const int DefaultWidgetSize = 1000;
    static constexpr const int DialSize = 200;
    static constexpr const int OuterCircleRadius = 95;
    static constexpr const int HourTickLength = 10;
    static constexpr const int MinuteTickLength = 5;
    static constexpr const int HourTickWidth = 2;
    static constexpr const int MinuteTickWidth = 1;
    static constexpr const int CenterDotRadius = 4;
    static constexpr const int HourHandLength = 50;
    static constexpr const int MinuteHandLength = 70;
    static constexpr const int SecondHandLength = 80;
    static constexpr const int HandWidth = 7;
    static constexpr const int HourRotationPerHour = 30; // 360 / 12
    static constexpr const int MinuteRotationPerMinute = 6; // 360 / 60
    static constexpr const int SecondRotationPerSecond = 6; // 360 / 60
 
    /* fonts */
    static constexpr const int NumberDistanceFromCenter = 70;
    static constexpr const int NumberFontSize = 14;
    Ui::ClockWidget* ui;
    QTime cur_time;
    /* paintEvent periodly and invoke the funcList in sequence */
    void drawBackground(QPainter* painter);
    void drawTicks(QPainter* painter);
    void drawHands(QPainter* painter);
    void drawNumbers(QPainter* painter);
    void drawCenterDot(QPainter* painter);
};
 
#endif // CLOCKWIDGET_H