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QT 绘制简易时钟

article 2024/9/20 1:28:00

头文件

#ifndef WIDGET_H
#define WIDGET_H

#include <QWidget>
#include <QPainter>
#include <QTime>
#include <QTimerEvent>
#include <QDebug>

QT_BEGIN_NAMESPACE
namespace Ui { class Widget; }
QT_END_NAMESPACE

class Widget : public QWidget
{
    Q_OBJECT

public:
    Widget(QWidget *parent = nullptr);
    ~Widget();

    void paintEvent(QPaintEvent *event) override;


private:
    Ui::Widget *ui;

    //声明 事件处理函数 重载
    void timerEvent(QTimerEvent *event) override;

};
#endif // WIDGET_H

原文件

#include "widget.h"
#include "ui_widget.h"

Widget::Widget(QWidget *parent)
    : QWidget(parent)
    , ui(new Ui::Widget)
{
    ui->setupUi(this);

    this->startTimer(1000);
}

Widget::~Widget()
{
    delete ui;
}

//时钟底座
void Widget::paintEvent(QPaintEvent *event)
{   
    QPainter painter(this);//实例化画家
    QPen pen;//实例化笔
    QFont font;//实例化字体

    //画笔属性
    pen.setWidth(5);

    //字体属性
    font.setFamily("楷体");
    font.setPointSize(10);

    //画家属性
    painter.setPen(pen);
    painter.setFont(font);
    painter.translate(this->width()/2,this->height()/2);//画家坐标

    //绘制圆
    painter.drawEllipse(QPoint(0,0),300,300);

    //绘制粗刻度
    painter.rotate(-60);
    for(int i = 0; i < 12; i++)
    {
        painter.drawLine(300,0,290,0);
        painter.rotate(30);
    }

    //绘制细刻度
    pen.setWidth(2);
    painter.setPen(pen);
    painter.rotate(-24);
    for(int i = 0; i < 60 ; i++)
    {
        painter.drawLine(300,0,295,0);
        painter.rotate(6);
    }

    //获取系统时间
    QTime time = QTime::currentTime();

    //绘制秒针
    painter.setPen(pen);
    painter.rotate(-6);
    painter.rotate(6*time.second());
    painter.drawLine(290,0,0,0);
    painter.rotate(-6*time.second());

    //绘制分针
    pen.setWidth(10);
    painter.setPen(pen);
    painter.rotate(6*time.minute());
    painter.drawLine(200,0,0,0);
    painter.rotate(-6*time.minute());

    //绘制时针
    pen.setWidth(15);
    painter.setPen(pen);
    painter.rotate(30*time.hour());
    painter.drawLine(100,0,0,0);

    qDebug()<<time.hour()<<" "<<time.minute()<<" "<<time.second();
}

void Widget::timerEvent(QTimerEvent *event)
{
    this->update();
}