Cpp/Qt-day040920Qt

目录

时钟

头文件：Widget.h:

源文件:Widget.c:

效果图：

思维导图

---

时钟

头文件：Widget.h:

#ifndef WIDGET_H
#define WIDGET_H
 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
 
QT_BEGIN_NAMESPACE
namespace Ui { class Widget; }
QT_END_NAMESPACE
 
class Widget : public QWidget
{
    Q_OBJECT
 
public:
    Widget(QWidget *parent = nullptr);
    ~Widget();
 
    void timerEvent(QTimerEvent *e) override;
    void paintEvent(QPaintEvent *event) override;
 
private:
    Ui::Widget *ui;
 
    //定义一个定时器
    int timerId;
 
 
};
#endif // WIDGET_H

源文件:Widget.c:

#include "widget.h"
#include "ui_widget.h"
 
Widget::Widget(QWidget *parent)
    : QWidget(parent)
    , ui(new Ui::Widget)
{
    ui->setupUi(this);
 
    timerId = startTimer(1000);
 
}
 
Widget::~Widget()
{
    delete ui;
}
 
void Widget::timerEvent(QTimerEvent *e)
{
 
 
    this->update();
}
 
void Widget::paintEvent(QPaintEvent *event){
    //实例化一个画家
    QPainter Panter(this);
    //实例化一支画笔
    QPen pen;
    //设置画笔线形为实线
    pen.setStyle(Qt::SolidLine);
    //设置画笔宽度为5
    pen.setWidth(5);
    //设置画笔颜色为红色
    pen.setColor(QColor("red"));
 
    //把画笔给画家安排上
    Panter.setPen(pen);
    //将基准坐标系设为界面正中心
    Panter.translate(QPoint(this->width()/2,this->height()/2));
    //给画家设置画刷，给钟添加底色
    Panter.setBrush(QBrush(QColor(188, 75, 126), Qt::Dense1Pattern));
    //画出一个半径为200的圆，作为时钟的框架
    Panter.drawEllipse(QPoint(0, 0), 200, 200);
 
    for(int i=0; i<60; i++){
        //每6度画一个小竖杠
        Panter.rotate(6);
        pen.setColor(QColor("black"));
        pen.setWidth(3);
 
        Panter.setPen(pen);
        Panter.drawLine(QPoint(0, 192),QPoint(0,200));
 
    }
 
    for(int i=1; i<=12; i++){
        //每30度画一个大竖杠
        Panter.rotate(30);
        pen.setColor(QColor("black"));
        pen.setWidth(3);
 
        Panter.setPen(pen);
        Panter.drawLine(QPoint(0, 186),QPoint(0,200));
 
    }
    Panter.rotate(212);
    for(int i=1; i<=12; i++){
        //每30度写上文字
        Panter.translate(0,184);
 
        pen.setColor(QColor("black"));
        pen.setWidth(20);
 
        Panter.setPen(pen);
        //设置文本
 
        QString text = QString::number(i);
        Panter.drawText(QPointF(0,0),text);
        Panter.translate(0,-184);
        Panter.rotate(30);
 
    }
    Panter.rotate(-32+180);
    QTime time = QTime::currentTime();
    int h = time.hour();
    int m = time.minute();
    int s = time.second();
    QPainter painterH(this);
    //设置画笔线形为实线
    pen.setStyle(Qt::SolidLine);
    //设置画笔宽度为5
    pen.setWidth(5);
    //设置画笔颜色为黑色
    pen.setColor(QColor("black"));
    painterH.setPen(pen);
    QPainter painterM(this);
    painterM.setPen(pen);
    QPainter painterS(this);
    painterS.setPen(pen);
    //将基准坐标系设为界面正中心
    painterH.translate(QPoint(this->width()/2,this->height()/2));
    painterH.rotate((h*3600+m*60+s)/120+180);
    painterM.translate(QPoint(this->width()/2,this->height()/2));
    painterM.rotate((m*60+s)/10+180);
    painterS.translate(QPoint(this->width()/2,this->height()/2));
    painterS.rotate(s*6+180);
 
    painterH.drawLine(0,0, 0,150);
    painterH.save();
    painterM.drawLine(0,0, 0,120);
    painterM.save();
    painterS.drawLine(0,0, 0,90);
    painterH.save();
    qDebug()<":"<":"<
}

效果图：

思维导图