用QT做一个时钟

最新推荐文章于 2024-12-08 10:13:57 发布

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#qt #timer #signal #class

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本文介绍了一个使用QT库实现的简单数字时钟程序。该程序能够实时更新显示当前时间，并通过旋转不同长度的手来表示小时、分钟和秒。文章包含了完整的源代码，包括头文件、实现文件及主函数。

源码来自“QT小神童”

clock.h

#ifndef CLOCK_H
#define CLOCK_H

#include <QtGui/QWidget>
#include <QPainter>
#include <QPoint>
#include <QTimer>
#include <QTime>
static QPoint sec[4]={QPoint(0,-70),QPoint(2,0),QPoint(0,10),QPoint(-2,0)};
static QPoint min[4]={QPoint(0,-60),QPoint(4,0),QPoint(0,12),QPoint(-4,0)};
static QPoint hour[4]={QPoint(0,-50),QPoint(6,0),QPoint(0,13),QPoint(-6,0)};

class Clock : public QWidget
{
Q_OBJECT

public:
    Clock(QWidget *parent = 0);
    ~Clock();
protected:
    void paintEvent(QPaintEvent *);
};

#endif // CLOCK_H

clock.cpp

#include "clock.h"

Clock::Clock(QWidget *parent)
    : QWidget(parent)
{
    QTimer *timer= new QTimer(this);
    timer->start(1000);
    connect(timer,SIGNAL(timeout()),this,SLOT(update()));
    resize(200,200);

}

Clock::~Clock()
{

}

void Clock::paintEvent(QPaintEvent *)
{
        QPainter paint(this);
        QTime time=QTime::currentTime();
        paint.translate(100,100);
        paint.setRenderHint(QPainter::Antialiasing);
        paint.setBrush(Qt::red);
        paint.setPen(Qt::red);
        paint.save();
        paint.rotate(6.0*time.second());
        paint.drawConvexPolygon(sec,4);
        paint.restore();

        paint.setBrush(Qt::blue);
        paint.setPen(Qt::blue);
        paint.save();
        paint.rotate(6.0*(time.minute()+time.second()/60.0));
        paint.drawConvexPolygon(min,4);
        paint.restore();

        paint.setBrush(Qt::black);
        paint.setPen(Qt::black);
        paint.save();
        paint.rotate(30.0*(time.hour()+time.minute()/60.0));
        paint.drawConvexPolygon(hour,4);
        paint.restore();

        for(int i=0;i<12;i++)
        {
        paint.rotate(30);
        paint.drawLine(0,-98,0,-88);
        }
}

main.c

#include <QtGui/QApplication>
#include "clock.h"

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    Clock w;
    w.show();

return a.exec();
}