QT4thclock

一个普普通通的小时钟

#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>

QT_BEGIN_NAMESPACE
namespace Ui {
class MainWindow;
}
QT_END_NAMESPACE

class MainWindow : public QMainWindow
{
    Q_OBJECT

public:
    MainWindow(QWidget *parent = nullptr);
    ~MainWindow();
    int picID=1;

private:

protected:
    void paintEvent(QPaintEvent *event) override;
};
#endif // MAINWINDOW_H

#include "mainwindow.h"
#include<QTimer>
#include<QPainter>
#include<QTime>
MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent)

{
    QTimer *timer=new QTimer(this);
    connect(timer, &QTimer::timeout, this, QOverload<>::of(&MainWindow::update));
    timer->start(1000);
    setWindowTitle("Clock");
    resize(200,200);
}

MainWindow::~MainWindow()
{

}

void MainWindow::paintEvent(QPaintEvent *event)
{
    static const QPoint hourHand[4] = {
        QPoint(5, 14),
        QPoint(-5, 14),
        QPoint(-4, -61),
        QPoint(4, -61)//构成时针梯形的四个点
    };//时针
    static const QPoint minuteHand[4] = {
        QPoint(4, 14),
        QPoint(-4, 14),
        QPoint(-3, -79),
        QPoint(3, -79)
    };

    static const QPoint secondHand[4] = {
        QPoint(1, 14),
        QPoint(-1, 14),
        QPoint(-1, -89),
        QPoint(1, -89)
    };
    const QColor hourColor(Qt::black);
    const QColor minuteColor(Qt::blue);
    const QColor secondColor(Qt::red);

    int side = qMin(width(), height());
    QPainter painter(this);
    QTime time=QTime::currentTime();//获取时间
    QDate date = QDate::currentDate();//获取日期

    painter.setRenderHint(QPainter::Antialiasing);//平滑
    painter.translate(width()/2,height()/2);//将原点移动到页面的中心
    painter.scale(side/200,side/200);//设置长宽比例因子
    painter.setBrush(hourColor);//设置画笔颜色
    painter.setPen(Qt::NoPen);

    painter.save();//保存
    painter.setPen(Qt::blue);
    painter.setFont(QFont("Arial", 10));
    painter.drawText(QRect(-side/2,side/2-290,side,290),Qt::AlignCenter,tr("Njupt"));
    painter.restore();
    painter.save();
    painter.setPen(Qt::black);//设置画笔颜色
    painter.setFont(QFont("Arial", 10));//设定字体
    painter.drawText(QRect(-side/2, side/2 - 100, side, 100), Qt::AlignCenter, date.toString("yyyy-MM-dd"));//将日期转化成字符串
    painter.restore();//存储

    painter.save();
    painter.rotate(30*(time.hour()+time.minute()/60));
    painter.drawConvexPolygon(hourHand, 4);
    for (int i = 0; i < 60; i++) {
        if (i % 5 == 0) {
            painter.drawRect(85, -2, 10, 4);//(x,y,width,height)时针
        } else {
            painter.drawRect(90, -1, 5, 2);//(x,y,width,height)分针
        }
        painter.rotate(6);//每调用一次，转六度
    }
    painter.restore();

    painter.save();
    painter.setBrush(minuteColor);

    painter.rotate(6*(time.minute()+time.second()/60));
    painter.drawConvexPolygon(minuteHand, 4);
    painter.restore();

    painter.save();
    painter.setBrush(secondColor);
    painter.rotate(6*time.second());
    painter.drawConvexPolygon(secondHand, 4);//
    painter.drawEllipse(-5, -68, 10, 10);//(x,y,r,r)画小圆圈
    painter.drawEllipse(-5, -6, 10, 10);
    painter.restore();

}

#include "mainwindow.h"

#include <QApplication>

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    MainWindow w;
    w.show();
    return a.exec();
}