第C++Qt繪制時鐘界面首先來看一下效果：

大概就是這樣子，需要注意的是，這里你需要創(chuàng)建一個基類為Widget的界面來繪制時鐘，以至于后期你想把這個時鐘放到任意一個界面，你只需要在那個界面的ui里面添加一個widget,然后將它提升為這個時鐘界面，并設定它的大小。

widget.h文件

#ifndefWIDGET_H

#defineWIDGET_H

#includemath.h

#includeQResizeEvent

#includeQGroupBox

#includeQTimer

#includeQTime

#includeQPainter

#includeQWidget

namespaceUi{

classWidget;

classWidget:publicQWidget

Q_OBJECT

public:

explicitWidget(QWidget*parent=0);

~Widget();

protected:

voidpaintEvent(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(newUi::Widget)

ui-setupUi(this);

QTimer*timer=newQTimer(this);//連接信號與槽

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

timer-start(1000);

//設置窗體名稱與大小

setWindowTitle(tr("Clock"));

ui-setupUi(this);

resize(350,350);

Widget::~Widget()

deleteui;

voidWidget::paintEvent(QPaintEvent*event)

staticconstQPointhourHand[3]=

QPoint(5,14),

QPoint(-5,14),

QPoint(0,-50)

staticconstQPointminuteHand[3]=

QPoint(5,14),

QPoint(-5,14),

QPoint(0,-70)

staticconstQPointsecondHand[3]=

QPoint(5,14),

QPoint(-5,14),

QPoint(0,-80)

staticconstQPointline_long[2]=

QPoint(0,100),

QPoint(0,80)

staticconstQPointline_short[2]={

QPoint(0,100),

QPoint(0,95)

//繪制的范圍

intside=qMin(width(),height());

//獲取當前的時間

QTimetime=QTime::currentTime();

//聲明用來繪圖用的painter

QPainterpainter(this);

//繪制的圖像反鋸齒

painter.setRenderHint(QPainter::Antialiasing);

//重新定位坐標起始點，把坐標原點放到窗體的中央

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

//在表盤內(nèi)添加文字（任意）

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

//設定畫布的邊界

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

//填充邊線設為黑色，也可以設置為NoPen

painter.setPen(Qt::black);

//畫刷顏色設定

painter.setBrush(Qt::black);

//保存painter的狀態(tài)

painter.save();

//設置painter的旋轉(zhuǎn)角度

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

//填充時針的區(qū)域

painter.drawConvexPolygon(hourHand,3);

painter.restore();

painter.setPen(Qt::black);

//12個個刻度循環(huán)

for(inti=0;i++i)

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

painter.rotate(30.0);

//繪制分針轉(zhuǎn)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(intj=0;j++j)

if((j%5)!=0)

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

painter.rotate(6.0);

//繪制分針轉(zhuǎn)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(intj=0;j++j)

if((j%5)!=0)

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

painter.rotate(6.0);

//繪制秒針轉(zhuǎn)角

painter.setPen(Qt::black);

painter.setBrush(Qt::black);

painter.save();

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

painter.drawConvexPolygon(secondHand,3);

painter.restore();