#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>

QT_BEGIN_NAMESPACE
namespace Ui { class MainWindow; }
QT_END_NAMESPACE

class MainWindow : public QMainWindow
{
 Q_OBJECT

public:
 MainWindow(QWidget *parent = nullptr);
 ~MainWindow();
 void paintEvent(QPaintEvent *event); //重載paintEvent函數(shù)
 void timerEvent(QTimerEvent *event); //重載timerEvent函數(shù)

private:
 Ui::MainWindow *ui;
 int second=0; //該變量用來記錄秒針旋轉度數(shù)
 double minute=0,hour=0;//該變量分別用來記錄分針，時針旋轉度數(shù)
 QPixmap pic; //用來保存導入的背景位圖
};
#endif // MAINWINDOW_H

#include "mainwindow.h"

#include <QApplication>

int main(int argc, char *argv[])
{
 QApplication a(argc, argv);
 MainWindow w;
 w.show();
 return a.exec();
}

#include "mainwindow.h"
#include "ui_mainwindow.h"
#include<QPainter>
#define PI 3.1415926
#define WIDE 1000
#define HIGHT 1000
MainWindow::MainWindow(QWidget *parent)
 : QMainWindow(parent)
 , ui(new Ui::MainWindow)
{
 ui->setupUi(this);
 resize(WIDE,HIGHT);
 startTimer(1000);

}

MainWindow::~MainWindow()
{
 delete ui;
}
void MainWindow::timerEvent(QTimerEvent *event)//該函數(shù)每秒執(zhí)行一次
{
 second+=6;  //秒針刻度+6°
 minute+=0.1; //秒針刻度+0.1°(秒針速度/60)
 hour+=0.0016666667; //秒針刻度+0.0016666667°(秒針速度/3600)
 repaint();
}
void MainWindow::paintEvent(QPaintEvent *event)
{
 QPainter painter(this);
 QPixmap pix(":/new/prefix1/1.png"); //導入背景位圖
 pic=pix;
 QRect p(0,0,1000,1000);
 QRect p2(0,0,1000,1000);
 painter.drawPixmap(p2,pic,p);  //以原有尺寸從界面（0，0）點繪制位圖
 painter.translate(WIDE/2-10,HIGHT/2); //設置繪圖原點坐標為(WIDE/2-10,HIGHT/2)(此處坐標即為表盤中心，便于接下來的指針即刻度線繪制時的旋轉操作)
 painter.drawEllipse(QPoint(10,0),327,327);
 painter.setBrush(QBrush(QColor(0,0,0)));
 painter.drawEllipse(QPoint(0,0),10,10);
 for (int i=1;i<=12;i++)
 {
  QFont font;      //設置字體
  font.setPointSize(17); //設置字體大小
  font.setFamily("Microsoft YaHei"); //設置字體樣式
  font.setLetterSpacing(QFont::AbsoluteSpacing,0);
  painter.setFont(font);
  QString s=QString("%1").arg(i); //將int型變量i轉化為Qstring類型以便用drawText函數(shù)畫在窗口
  painter.drawText(QPoint(290*cos(PI*(i-1)/6-PI/3),290*sin(PI*(i-1)/6-PI/3)+10),s);    //將數(shù)字1-12在窗口畫在以原點為中心，290為半徑的圓上每次繪畫后角度順時針旋轉30°
 }
 for (int i=0;i<=60;i++) //表盤刻度的繪制以及顏色漸變的實現(xiàn)
 {
  painter.translate(WIDE/2,HIGHT/2); //設置繪圖原點為(WIDE/2,HIGHT/2)
  if(i*12<255) //從六點左邊一格的刻度開始繪制，且每次繪制時以i為變量改變rgb顏色實現(xiàn)鐘表刻度填充色的漸變
  {
   painter.setBrush(QBrush(QColor(0,0,i*12)));  
  }
  else if(i*12>255&i*12<510)
  {
   painter.setBrush(QBrush(QColor(0,((42-i)*12)%255,0)));
  }
  else
  {
   painter.setBrush(QBrush(QColor(((63-i)*12)%255,0,0)));
  }
  if(i%5==0)  //當i為5的倍數(shù)時繪制較長刻度線 繪制方法為通過rotate函數(shù)以之前設置的原點為旋轉軸旋轉一定角度到相應刻度線位置
  {
   painter.rotate(6*i);
   painter.drawRect(0,327,4,-30);

  }
  else
  {
   painter.rotate(6*i);
   painter.drawRect(0,327,2,-20);
  }
  painter.resetTransform(); //重置繪圖中心
 }
 painter.setBrush(QBrush(QColor(0,0,0))); //設置黑色填充色
  painter.translate(WIDE/2-10,HIGHT/2); //繪制秒針
 painter.rotate(second);  //以原點為軸旋轉相應角度以指向相應刻度 下同
 painter.drawRect(-5,-320,10,320);
 painter.resetTransform();
 painter.translate(WIDE/2-10,HIGHT/2); //繪制分針
 painter.rotate(minute);
 painter.drawRect(-3,-300,6,300);
 painter.resetTransform();
 painter.translate(WIDE/2-10,HIGHT/2); //繪制時針
 painter.rotate(hour);
 painter.drawRect(-7,-180,14,180);
 painter.resetTransform();

}