大家好，遇到个问题，车标根据收到的经纬度信息更新位置，发现更新的频率大概是1s更新一次，实际设置的时间是200ms。
设置了下面两种方法，都无效果，求助
1.this->viewport()->repaint(0,0,320,180);
2.this->viewport()->update();

bool g_test = true;
graphicsView::graphicsView()
{
    if(SHAPEMANAGE_SING->readlayer())
    {
        SHAPEMANAGE_SING->initData();
        if(g_test)
        {
            SHAPEMANAGE_SING->testData();
        }
    }
    m_pos = 0;
    m_scare = 5;
    m_ni = 0;
    m_graphicsScene = new QGraphicsScene;
    //    m_graphicsScene->setBackgroundBrush(Qt::black);
    setFrameStyle(QFrame::NoFrame);
    m_graphicsScene->setSceneRect(0, 0, 320, 180);
    //    setBackgroundBrush(Qt::black);
    setAlignment(Qt::AlignCenter);
    setRenderHint(QPainter::Antialiasing, false);
    setDragMode(QGraphicsView::ScrollHandDrag);
    setOptimizationFlags(QGraphicsView::DontSavePainterState);
    setViewportUpdateMode(QGraphicsView::SmartViewportUpdate);
    setTransformationAnchor(QGraphicsView::AnchorUnderMouse);
    setWindowFlags(Qt::FramelessWindowHint);
    setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
    setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);


    setScene(m_graphicsScene);
    populateScene();
    QTimer *timer = new QTimer(this);
    connect(timer, SIGNAL(timeout()), this, SLOT(handleOutTiemr()));
    timer->start(200);
}

void graphicsView::handleOutTiemr()
{

    m_graphicsScene->clear();
    populateScene();

    if(g_test)
    {
        if(m_pos >= 0 && m_pos < SHAPEMANAGE_SING->m_testPos.length())
        {
            dataPoint carPos;
            carPos.latitude = SHAPEMANAGE_SING->Singleton()->m_testPos.value(m_pos).X;
            carPos.longitude = SHAPEMANAGE_SING->Singleton()->m_testPos.value(m_pos).Y;
            //qDebug("x %f, y %f",carPos.latitude,carPos.longitude);
            SHAPE_DATAMANAGE->setCarPos(carPos);
            m_pos ++;
        }
        else
        {
            m_pos = 0;
        }
    }
//    下面两种刷新都无效果
//    this->viewport()->repaint(0,0,320,180);
//   this->viewport()->update();
}