基于QT5实现一个时钟桌面

发布时间：2024-02-20 14:30

介绍

这是一个简单的时钟运行界面，项目的结构如图所示，主要包含一个头文件：** analogclock.h **，两个源文件: ** analogclock.cpp main.cpp **.

看完本教程，你就可以知悉在Windows系统上如何实现一个界面程序并部署在Windows系统上。

实现代码

clock.pro

QT       += core gui

greaterThan(QT_MAJOR_VERSION, 4): QT += widgets

CONFIG += c++11

# You can make your code fail to compile if it uses deprecated APIs.
# In order to do so, uncomment the following line.
#DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000    # disables all the APIs deprecated before Qt 6.0.0

SOURCES += \\
    main.cpp \\
    analogclock.cpp

HEADERS += \\
    analogclock.h

# Default rules for deployment.
qnx: target.path = /tmp/$${TARGET}/bin
else: unix:!android: target.path = /opt/$${TARGET}/bin
!isEmpty(target.path): INSTALLS += target

analogclock.h

#ifndef ANALOGCLOCK_H
#define ANALOGCLOCK_H

#include 

class AnalogClock : public QWidget
{
    Q_OBJECT

public:
    AnalogClock(QWidget *parent=0);
protected:
    void paintEvent(QPaintEvent *event) override;
};
#endif // WIDGET_H

analogclock.cpp

#include 
#include \"analogclock.h\"
AnalogClock::AnalogClock(QWidget *parent)
    : QWidget(parent)
{
    QTimer *timer = new QTimer(this);
    //实例一个QTimer的类
    connect(timer, SIGNAL(timeout()), this, SLOT(update()));
    //监控timeout（）信号是否发出
    //timeout()表示：This signal is emitted when the timer times out.
    //指计时器发出信号，即下面的延时器发出信号
    timer->start(1000);//设置1s的延时
   /*
    *for a function
    * void QTimer::start(int msec)
    * Starts or restarts the timer with a timeout interval of msec milliseconds.
    * If the timer is already running, it will be stopped and restarted.
    * If singleShot is true, the timer will be activated only once.
    * 单位是毫秒，表示每一秒设置一个信号发出
    */
    setWindowTitle(tr(\"Analog Clock\"));
    //void setWindowTitle(const QString &)
    resize(200, 200);
    //初始值大小
}
void AnalogClock::paintEvent(QPaintEvent *)
 {
    /*
     *
     *   repaint() or update() was invoked,
     *   the widget was obscured and has now been uncovered, or
     *   many other reasons.
     *
     *
     */
    static const QPoint hourHand[3] = {
        QPoint(7, 8),
        QPoint(-7, 8),
        QPoint(0, -40)
    };//用于绘制时针的三角形
    static const QPoint minuteHand[3] = {
        QPoint(7, 8),
        QPoint(-7, 8),
        QPoint(0, -60)
    };//用于绘制分针的三角形
    static const QPoint secondHand[3]={
        QPoint(7,8),
        QPoint(-7,8),
        QPoint(0,-90)
    };//用于绘制秒针的三角形

    QColor hourColor(127, 0, 127);
    QColor minuteColor(0, 127, 127, 191);
    //QColor::QColor(int r, int g, int b, int a = 255)a表示透明度
    QColor secondColor(220,20,60,100);
    //为每一个图形绘制颜色及透明度

    int side = qMin(width(), height());
    //我认为这一句的作用在于找到最小标出，用于坐标系的绘制

    QTime time = QTime::currentTime();
    qDebug()<

main.cpp

#include \"analogclock.h\"

#include 

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