本文实例为大家分享了Qt实现简易时钟展示的具体代码，供大家参考，具体内容如下

一、效果展示

简单实现时钟（圆盘+QLCDNumber），大小刻度，数字等。

二、实现

.pro

QT += core gui greaterThan(QT_MAJOR_VERSION, 4): QT += widgets CONFIG += c++11 # The following define makes your compiler emit warnings if you use# any Qt feature that has been marked deprecated (the exact warnings# depend on your compiler). Please consult the documentation of the# deprecated API in order to know how to port your code away from it.DEFINES += QT_DEPRECATED_WARNINGS # You can also make your code fail to compile if it uses deprecated APIs.# In order to do so, uncomment the following line.# You can also select to disable deprecated APIs only up to a certain version of Qt.#DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000 # disables all the APIs deprecated before Qt 6.0.0 SOURCES += \ main.cpp \ mainwindow.cpp HEADERS += \ mainwindow.h FORMS += \ mainwindow.ui # Default rules for deployment.qnx: target.path = /tmp/$${TARGET}/binelse: unix:!android: target.path = /opt/$${TARGET}/bin!isEmpty(target.path): INSTALLS += target RESOURCES += \ image.qrc

.h

#ifndef MAINWINDOW_H#define MAINWINDOW_H #include <QMainWindow>#include <QDateTime> QT_BEGIN_NAMESPACEnamespace Ui { class MainWindow; }QT_END_NAMESPACE class MainWindow : public QMainWindow{ Q_OBJECT public: MainWindow(QWidget *parent = nullptr); ~MainWindow(); void paintEvent(QPaintEvent *event); bool showColon = false;public slots: void countTime(); private: Ui::MainWindow *ui;};#endif // MAINWINDOW_H

.cpp

#include "mainwindow.h"#include "ui_mainwindow.h"#include<QPainter>#include<QTimer>#include<QTime>#include<QString> MainWindow::MainWindow(QWidget *parent) : QMainWindow(parent) , ui(new Ui::MainWindow){ ui->setupUi(this); QTimer *timer = new QTimer(this); connect(timer, SIGNAL(timeout()), this, SLOT(update())); connect(timer, SIGNAL(timeout()), this, SLOT(countTime())); timer->start(1000); countTime(); setWindowTitle(tr("Clock_by_Xr")); setFixedSize(800, 400); } MainWindow::~MainWindow(){ delete ui;} void MainWindow::paintEvent(QPaintEvent *event){ static QPoint hourHand[3] = { QPoint(5, 3), QPoint(-5, 3), QPoint(0, -30) }; static QPoint minuteHand[3] = { QPoint(4, 6), QPoint(-4, 6), QPoint(0, -45) }; static QPoint secondHand[3] = { QPoint(2, 10), QPoint(-2, 10), QPoint(0, -60) }; //颜色 QColor hourColor(0, 185, 211, 238); QColor minuteColor(0, 96, 123, 139); QColor secondColor(0, 176, 226, 255); int side = qMin(width(), height()); QTime time = QTime::currentTime(); QPainter painter(this); painter.setRenderHint(QPainter::Antialiasing); //表盘 QBrush brush1(QColor(164,211,238)); QPen pen1(QColor(164,211,238)); painter.setBrush(brush1); painter.setPen(pen1); painter.drawEllipse(QPoint(200,200),200/3*2,200/3*2); QBrush brush2(QColor(245,245,245)); QPen pen2(QColor(245,245,245)); painter.setBrush(brush2); painter.setPen(pen2); painter.drawEllipse(QPoint(200,200),194/3*2,194/3*2); QBrush brush3(QColor(250,250,250)); QPen pen3(QColor(250,250,250)); painter.setBrush(brush3); painter.setPen(pen3); painter.drawEllipse(QPoint(200,200),183/3*2,183/3*2); QBrush brush4(QColor(255,255,255)); QPen pen4(QColor(255,255,255)); painter.setBrush(brush4); painter.setPen(pen4); painter.drawEllipse(QPoint(200,200),175/3*2,175/3*2); painter.setRenderHint(QPainter::Antialiasing); painter.translate(width()/4, height()/2); painter.scale(side/200.0, side/200.0); painter.setPen(Qt::NoPen); painter.setBrush(hourColor); painter.save(); painter.rotate(30.0 * ((time.hour() + time.minute() / 60.0))); painter.drawConvexPolygon(hourHand, 3); painter.restore(); //刻度 painter.setPen(hourColor); for (int i = 0; i < 12; ++i) { painter.rotate(30.0); painter.drawLine(66,0,72,0); painter.drawText(-15, -65, 30, 30,Qt::AlignHCenter,QString::number(i+1)); } //分钟 painter.setPen(Qt::NoPen); painter.setBrush(minuteColor); painter.save(); painter.rotate(6.0 * (time.minute() + time.second() / 60.0)); painter.drawConvexPolygon(minuteHand, 3); painter.restore(); painter.setPen(minuteColor); for (int j = 0; j < 60; ++j) { if ((j % 5) != 0) painter.drawLine(68, 0, 72, 0); painter.rotate(6.0); } //秒钟 painter.setPen(Qt::NoPen); painter.setBrush(secondColor); painter.save(); painter.rotate(6.0 * time.second()); painter.drawConvexPolygon(secondHand, 3); painter.restore(); painter.end();} void MainWindow::countTime(){ QTime t = QTime::currentTime(); QString text=t.toString("hh:mm:ss"); if(showColon){ text[2] = ':'; text[5] = ':'; showColon = false; } else{ text[2] = ' '; text[5] = ' '; showColon = true; } ui->lcdNumber->display(text); ui->lcdNumber_2->display(text);}

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。