本文实例为大家分享了Qt实现简单动态时钟的具体代码，供大家参考，具体内容如下
任务实现：
通过Qt语言使用计时器实现一个简单的动态时钟；
实现效果：
实现过程：
整体过程主要分为两个部分：
1.绘制一个表盘所需的元素：时分秒针，刻度，还可以插入钟面背景图片；
2.让所绘制的指针动起来（使用计时器并关联系统时间）；
整体代码：
dialog.h
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#ifndef DIALOG_H#define DIALOG_H#include <QDialog>QT_BEGIN_NAMESPACEnamespace Ui { class Dialog; }QT_END_NAMESPACEclass Dialog : public QDialog{ Q_OBJECTpublic: Dialog(QWidget *parent = nullptr); ~Dialog(); void paintEvent(QPaintEvent *event); void drawSecond(QPainter *painter); void drawMinute(QPainter *painter); void drawHour(QPainter *painter); void drawClock(QPainter *painter);private: Ui::Dialog *ui;};#endif // DIALOG_H |
dialog.cpp
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#include "dialog.h"#include "ui_dialog.h"#include <QPainter>#include <QTime>#include <QTimer>#include <QPixmap>#include <QPen>Dialog::Dialog(QWidget *parent) : QDialog(parent) , ui(new Ui::Dialog){ ui->setupUi(this); resize(959,959); setWindowTitle("My Clock"); QTimer *timer = new QTimer(this); timer->start(1000); //信号的链接 connect(timer,SIGNAL(timeout()),this,SLOT(update()));}Dialog::~Dialog(){ delete ui;}void Dialog::paintEvent(QPaintEvent *event){ QPainter painter(this); QPixmap map(":/Resrouse/Pic.jpg"); QRect q(0,0,959,959); QRect q2(0,0,width(),height()); painter.drawPixmap(q2,map,q); //防止图形走样 painter.setRenderHint(QPainter::Antialiasing,true); //使得窗口可调节，图形随之变形 painter.setWindow(0,0,200,200); //重新设置坐标轴的原点位置 painter.translate(100,100); //调用绘制图像函数，分别绘制时分秒 drawClock(&painter); drawSecond(&painter); drawMinute(&painter); drawHour(&painter);}void Dialog::drawSecond(QPainter *painter){ static const QPoint Second[4]= { QPoint(2, 5), QPoint(0, 18), QPoint(-2, 5), QPoint(0, -90) }; //获取当前系统时间currentTime(); QTime time = QTime::currentTime(); //设置绘制颜色 painter->setBrush(Qt::red); painter->setPen(Qt::red); //save进行保存 painter->save(); //完成绘制（时间换算倾斜角度） painter->rotate(6.0*time.second()); painter->drawConvexPolygon(Second,4); //ratate进行复位 painter->restore();}void Dialog::drawMinute(QPainter *painter){ static const QPoint Minute[4]= { QPoint(2, 5), QPoint(0, 16), QPoint(-2, 5), QPoint(0, -70) }; QTime time = QTime::currentTime(); painter->setBrush(Qt::blue); painter->setPen(Qt::blue); painter->save(); painter->rotate(6.0*(time.minute()+time.second()/60.0)); painter->drawConvexPolygon(Minute,4); painter->restore();}void Dialog::drawHour(QPainter *painter){ static const QPoint Hour[4]= { QPoint(2, 5), QPoint(0, 13), QPoint(-2, 5), QPoint(0, -40) }; QTime time = QTime::currentTime(); painter->setBrush(Qt::yellow); painter->setPen(Qt::yellow); painter->save(); painter->rotate(30.0*(time.hour()+time.minute()/60.0)); painter->drawConvexPolygon(Hour,4); painter->restore();}void Dialog::drawClock(QPainter *painter){ QPen pen; pen.setWidth(2); pen.setColor(Qt::white); painter->setPen(pen); //绘制钟表刻度盘和数字 for (int i = 1; i <=60; ++i) { painter->save(); painter->rotate(6*i);//坐标轴旋转6度 //分别绘制长短线 if (i % 5 == 0) { painter->drawLine(0, -98, 0, -82); painter->drawText(-20, -82, 40, 40,Qt::AlignHCenter | Qt::AlignTop,QString::number(i/5)); } else { painter->drawLine(0, -98, 0, -88); } painter->restore();//绘制图形后复位坐标系 }} |
表盘绘制：
使用paintEvent（）函数，以结构体形式来储存每一个指针的大小位置，并进行绘制；
下面用秒针的绘制作为例子：
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void Dialog::drawSecond(QPainter *painter){ static const QPoint Second[4]= { QPoint(3, 5), QPoint(0, 18), QPoint(-3, 5), QPoint(0, -90) }; //获取当前系统时间currentTime(); QTime time = QTime::currentTime(); //设置绘制颜色 painter->setBrush(Qt::red); painter->setPen(Qt::red); //save进行保存 painter->save(); //完成绘制（时间换算倾斜角度） painter->rotate(6.0*time.second()); painter->drawConvexPolygon(Second,4); //ratate进行复位 painter->restore();} |
调用时间：
设置计时器的时间为1000ms，即1s；
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QTimer *timer = new QTimer(this);timer->start(1000);//信号的链接connect(timer,SIGNAL(timeout()),this,SLOT(update())); |
其他：
1.图片的插入：
map中内容可替换为自行导入的资源文件
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QPixmap map(":/Resrouse/Pic.jpg");QRect q(0,0,959,959);QRect q2(0,0,width(),height());painter.drawPixmap(q2,map,q); |
2.绘制颜色的改变：
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QPen pen; //设置画笔的宽度pen.setWidth(2); //设置画笔的颜色pen.setColor(Qt::white);//调用设置的画笔参数painter->setPen(pen); |
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服务器之家。
原文链接：https://blog.csdn.net/weixin_45752304/article/details/106408363
