Qt中重绘制窗口方法：

 void CircleWidget::paintEvent(QPaintEvent * event)

 {

     QPainter painter(this);

     int wight = this->width();

     int heigth = this->height();

     if (m_timers==)

     {

         QColor green(, , 0xff);

         QPen pen(green);

         painter.setBrush(QBrush(QColor(0x00, 0xFF, 0x00)));

         pen.setStyle(Qt::DashLine);

         painter.setPen(pen);

         m_timers++;

     }

     else

     {

         QColor red(0xff, ,);

         QPen pen(red);

         painter.setBrush(QBrush(QColor(0xFF,0x00,0x00)));

         pen.setStyle(Qt::DashLine);

         painter.setPen(pen);

         m_timers = ;

     }

     painter.drawRect(, , , );

 }

 void CircleWidget::timerEvent(QTimerEvent* event)

 {

     if (event->timerId() == m_TimerID)

     {

         update();

     }

 }