QChart refresh, with new call chart function, that add chart but not delete the first one...

[filipdns]

Hello, How can I have dynamic update of my chart?
I try chartView.update, chartView.repaint, chart.removeAllSeries but nothing work

here the code:

    QFile fileGraph("d:/Magasin_Temp_Hygro2.txt");//select text file with recorded data
    fileGraph.open(QFile::ReadOnly);//open text file with recorded data
    int line_count=0;
    qreal temp=0;
    QString date;
    qreal hygro;
    QLineSeries *temperature = new QLineSeries();
    QLineSeries *hygrometrie = new QLineSeries();
    QCategoryAxis *axisX = new QCategoryAxis;
    QCategoryAxis *axisY1 = new QCategoryAxis;
    QCategoryAxis *axisY = new QCategoryAxis;
    while( !fileGraph.atEnd())//loop until end of QTextStrem
    {
        QString line=fileGraph.readLine();
        QString date=line.split(":")[0];
        bool ok = false;
        temp=line.split(":")[2].toDouble(&ok);
        hygro=line.split(":")[4].replace(";","").toDouble(&ok);
        axisX->append(date,line_count);
        axisY1->append(QString::number(temp),temp);
        axisY->append(QString::number(hygro),hygro);
        *temperature <<QPointF(line_count, temp);
        *hygrometrie <<QPointF(line_count, hygro);
        line_count++;
    }

    chart->addSeries(temperature);
    chart->addSeries(hygrometrie);
    temperature->attachAxis(axisX);
    temperature->attachAxis(axisY1);
    hygrometrie->attachAxis(axisY);
    axisX->setLabelsAngle(-90);
    axisX->setLabelsPosition(QCategoryAxis::AxisLabelsPositionOnValue);
    axisY1->setLabelsPosition(QCategoryAxis::AxisLabelsPositionOnValue);
    axisY1->setMin(10);
    axisY1->setMax(100);
    axisY1->setLabelsColor(temperature->pen().color());
    axisY->setLabelsPosition(QCategoryAxis::AxisLabelsPositionOnValue);
    axisY->setMin(10);
    axisY->setMax(100);
    axisY->setLabelsColor(hygrometrie->pen().color());
    chart->addAxis(axisY, Qt::AlignRight);
    chart->addAxis(axisY1, Qt::AlignLeft);
    chart->addAxis(axisX, Qt::AlignBottom);
    chart->setTitle("Revelé Température et humidité Magasin");
    chartView->setRenderHint(QPainter::Antialiasing);
    chartView->chart()->setAxisX(axisX, hygrometrie);
    chartView->chart()->setAxisY(axisY, hygrometrie);
    chartView->chart()->setAxisX(axisY1, temperature);
    fileGraph.close();

here the result:

Thank you for your help