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();
     }
 }