QML ChartView Model

[neda]

Hi,
I wanna draw chart when received data from serial port.
I used this code but I have not any point on chart.
Please guide me.
Thanks

void SerialPort::readData()
{
    QByteArray data = serial->read();
    ....
    ....
    chartModel->addPointChart(x,y);
}
void ChartModel::addPointChart(double x,double y){            
    QStandardItem* it = new QStandardItem();
    it->setData(x, ChartModel::x);
    it->setData(y, ChartModel::y);
    newChartModel->appendRow(it);
}

ChartView {
        id: chartView
        anchors.fill: parent
        backgroundColor: "transparent"
        legend{
            visible: false
        }
        theme: chartView.ChartThemeBlueIcy
        dropShadowEnabled: true
        animationOptions: ChartView.AllAnimations
        
        ValueAxis {
            id: valueAxisX
            min: 0
            max: 50
            color: "transparent"
            labelsFont:Qt.font({pointSize: 12})
        }

        ValueAxis {
            id: valueAxisY
            min: 0
            max: 200
            color: "transparent"
        }
                
        HXYModelMapper{
            series: lineSeries
            model: chartModel.newChartModel
        }

        SplineSeries {
            id: lineSeries
            name: "LineSeries"
            color: "blue"
            width: 8
            VXYModelMapper{
                series: lineSeries
                model: chartModel.newChartModel
                xColumn: 0
                yColumn: 0
            }        
        }
    }