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C++ Qt繪制時(shí)鐘界面

更新時(shí)間：2021年12月30日 14:03:29 作者：你不懂細(xì)節(jié)

大家好，本篇文章主要講的是C++ Qt繪制時(shí)鐘界面，感興趣的同學(xué)趕快來看一看吧，對(duì)你有幫助的話記得收藏一下，方便下次瀏覽

首先來看一下效果：

大概就是這樣子，需要注意的是，這里你需要?jiǎng)?chuàng)建一個(gè)基類為Widget的界面來繪制時(shí)鐘，以至于后期你想把這個(gè)時(shí)鐘放到任意一個(gè)界面，你只需要在那個(gè)界面的ui里面添加一個(gè)widget,然后將它提升為這個(gè)時(shí)鐘界面，并設(shè)定它的大小。

widget.h文件

#ifndef WIDGET_H
#define WIDGET_H
 
#include<math.h>
#include<QResizeEvent>
#include<QGroupBox>
#include<QTimer>
#include<QTime>
#include<QPainter>
 
#include <QWidget>
 
namespace Ui {
class Widget;
}
 
class Widget : public QWidget
{
    Q_OBJECT
 
public:
    explicit Widget(QWidget *parent = 0);
    ~Widget();
protected:
    void paintEvent(QPaintEvent *event);
 
private:
    Ui::Widget *ui;
};
 
#endif // WIDGET_H

widget.cpp文件

#include "widget.h"
#include "ui_widget.h"
 
Widget::Widget(QWidget *parent) :
    QWidget(parent),
    ui(new Ui::Widget)
{
    ui->setupUi(this);
    QTimer *timer = new QTimer(this);  //連接信號(hào)與槽
    connect(timer, SIGNAL(timeout()), this, SLOT(update()));
    timer->start(1000);
    //設(shè)置窗體名稱與大小
    setWindowTitle(tr("Clock"));
    ui->setupUi(this);
    resize(350,350);
}
 
Widget::~Widget()
{
    delete ui;
}
 
void Widget::paintEvent(QPaintEvent *event)
{
    static const QPoint hourHand[3] =
    {
        QPoint(5, 14),
        QPoint(-5, 14),
        QPoint(0, -50)
    };
    static const QPoint minuteHand[3] =
    {
        QPoint(5, 14),
        QPoint(-5,14),
        QPoint(0, -70)
    };
    static const QPoint secondHand[3] =
    {
        QPoint(5, 14),
        QPoint(-5, 14),
        QPoint(0, -80)
    };
    static const QPoint line_long[2]=
    {
        QPoint(0,100),
        QPoint(0,80)
    };
    static const QPoint line_short[2]={
        QPoint(0,100),
        QPoint(0,95)
    };
    //繪制的范圍
    int side = qMin(width(), height());
    //獲取當(dāng)前的時(shí)間
    QTime time = QTime::currentTime();
    //聲明用來繪圖用的painter
    QPainter painter(this);
    //繪制的圖像反鋸齒
    painter.setRenderHint(QPainter::Antialiasing);
    //重新定位坐標(biāo)起始點(diǎn)，把坐標(biāo)原點(diǎn)放到窗體的中央
    painter.translate(width() / 2, height() / 2);
    //在表盤內(nèi)添加文字（任意）
    //painter.drawText(-75,-120,100,170,Qt::AlignRight,tr("ROLEX"));
    //設(shè)定畫布的邊界
    painter.scale(side / 200.0, side / 200.0);
    //填充邊線設(shè)為黑色，也可以設(shè)置為NoPen
    painter.setPen( Qt::black );
    //畫刷顏色設(shè)定
    painter.setBrush(Qt::black);
    //保存painter的狀態(tài)
    painter.save();
    //設(shè)置painter的旋轉(zhuǎn)角度
    painter.rotate(30.0 * ((time.hour() + time.minute() / 60.0)));
    //填充時(shí)針的區(qū)域
    painter.drawConvexPolygon(hourHand, 3);
    painter.restore();
    painter.setPen(Qt::black);
    //12個(gè)個(gè)刻度循環(huán)
    for (int i = 0; i < 12; ++i)
    {
        painter.drawLine(line_long[0],line_long[1]);
        painter.rotate(30.0);
    }
    //繪制分針轉(zhuǎn)角、刻度
    painter.setPen(Qt::black);
    painter.setBrush(Qt::black);
    painter.save();
    painter.rotate(6.0 * (time.minute() + time.second() / 60.0));
    painter.drawConvexPolygon(minuteHand, 3);
    painter.restore();
    painter.setPen(Qt::black);
    for (int j = 0; j < 60; ++j)
    {
        if ((j % 5) != 0)
        painter.drawLine(line_short[0],line_short[1]);
        painter.rotate(6.0);
    }
 
     //繪制分針轉(zhuǎn)角、刻度
    painter.setPen(Qt::black);
    painter.setBrush(Qt::black);
    painter.save();
    painter.rotate(6.0 * (time.minute() + time.second() / 60.0));
    painter.drawConvexPolygon(minuteHand, 3);
    painter.restore();
    painter.setPen(Qt::black);
    for (int j = 0; j < 60; ++j)
    {
        if ((j % 5) != 0)
        painter.drawLine(line_short[0],line_short[1]);
        painter.rotate(6.0);
    }
   //繪制秒針轉(zhuǎn)角
    painter.setPen(Qt::black);
    painter.setBrush(Qt::black);
    painter.save();
    painter.rotate(6.0*time.second());
    painter.drawConvexPolygon(secondHand,3);
    painter.restore();
 
}

main.cpp文件

#include "widget.h"
#include <QApplication>
 
int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    Widget w;
    w.show();
    return a.exec();
}

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