C++ Qt绘制时钟界面

首先来看一下效果:

大概就是这样子,需要注意的是,这里你需要创建一个基类为Widget的界面来绘制时钟,以至于后期你想把这个时钟放到任意一个界面,你只需要在那个界面的ui里面添加一个widget,然后将它提升为这个时钟界面,并设定它的大小。

widget.h文件

#ifndef WIDGET_H

#define WIDGET_H

#include<math.h>

#include<QResizeEvent>

#include<QGroupBox>

#include<QTimer>

#include<QTime>

#include<QPainter>

#include <QWidget>

namespace Ui {

class Widget;

}

class Widget : public QWidget

{

Q_OBJECT

public:

explicit Widget(QWidget *parent = 0);

~Widget();

protected:

void paintEvent(QPaintEvent *event);

private:

Ui::Widget *ui;

};

#endif // WIDGET_H

widget.cpp文件

#include "widget.h"

#include "ui_widget.h"

Widget::Widget(QWidget *parent) :

QWidget(parent),

ui(new Ui::Widget)

{

ui->setupUi(this);

QTimer *timer = new QTimer(this); //连接信号与槽

connect(timer, SIGNAL(timeout()), this, SLOT(update()));

timer->start(1000);

//设置窗体名称与大小

setWindowTitle(tr("Clock"));

ui->setupUi(this);

resize(350,350);

}

Widget::~Widget()

{

delete ui;

}

void Widget::paintEvent(QPaintEvent *event)

{

static const QPoint hourHand[3] =

{

QPoint(5, 14),

QPoint(-5, 14),

QPoint(0, -50)

};

static const QPoint minuteHand[3] =

{

QPoint(5, 14),

QPoint(-5,14),

QPoint(0, -70)

};

static const QPoint secondHand[3] =

{

QPoint(5, 14),

QPoint(-5, 14),

QPoint(0, -80)

};

static const QPoint line_long[2]=

{

QPoint(0,100),

QPoint(0,80)

};

static const QPoint line_short[2]={

QPoint(0,100),

QPoint(0,95)

};

//绘制的范围

int side = qMin(width(), height());

//获取当前的时间

QTime time = QTime::currentTime();

//声明用来绘图用的painter

QPainter painter(this);

//绘制的图像反锯齿

painter.setRenderHint(QPainter::Antialiasing);

//重新定位坐标起始点,把坐标原点放到窗体的中央

painter.translate(width() / 2, height() / 2);

//在表盘内添加文字(任意)

//painter.drawText(-75,-120,100,170,Qt::AlignRight,tr("ROLEX"));

//设定画布的边界

painter.scale(side / 200.0, side / 200.0);

//填充边线设为黑色,也可以设置为NoPen

painter.setPen( Qt::black );

//画刷颜色设定

painter.setBrush(Qt::black);

//保存painter的状态

painter.save();

//设置painter的旋转角度

painter.rotate(30.0 * ((time.hour() + time.minute() / 60.0)));

//填充时针的区域

painter.drawConvexPolygon(hourHand, 3);

painter.restore();

painter.setPen(Qt::black);

//12个个刻度循环

for (int i = 0; i < 12; ++i)

{

painter.drawLine(line_long[0],line_long[1]);

painter.rotate(30.0);

}

//绘制分针转角、刻度

painter.setPen(Qt::black);

painter.setBrush(Qt::black);

painter.save();

painter.rotate(6.0 * (time.minute() + time.second() / 60.0));

painter.drawConvexPolygon(minuteHand, 3);

painter.restore();

painter.setPen(Qt::black);

for (int j = 0; j < 60; ++j)

{

if ((j % 5) != 0)

painter.drawLine(line_short[0],line_short[1]);

painter.rotate(6.0);

}

//绘制分针转角、刻度

painter.setPen(Qt::black);

painter.setBrush(Qt::black);

painter.save();

painter.rotate(6.0 * (time.minute() + time.second() / 60.0));

painter.drawConvexPolygon(minuteHand, 3);

painter.restore();

painter.setPen(Qt::black);

for (int j = 0; j < 60; ++j)

{

if ((j % 5) != 0)

painter.drawLine(line_short[0],line_short[1]);

painter.rotate(6.0);

}

//绘制秒针转角

painter.setPen(Qt::black);

painter.setBrush(Qt::black);

painter.save();

painter.rotate(6.0*time.second());

painter.drawConvexPolygon(secondHand,3);

painter.restore();

}

main.cpp文件

#include "widget.h"

#include <QApplication>

int main(int argc, char *argv[])

{

QApplication a(argc, argv);

Widget w;

w.show();

return a.exec();

}

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