Adding series to qml Chartview

[milan]

Hello, I came across a problem. How can I add new series and remove series from existing qml Chartview from C++?
I have data for series in C++, also I need qml Chartview as I am developing qml application. Please help. How could this be achieved

[Mammamia]

This is an abstract version of what you should do to achieve what you need.

void PlotData::updateData(QAbstractSeries *p_series)
{
        QVector<QPointF> pointList;
        // fill data into pointlist
        QXYSeries *xySeries = static_cast<QXYSeries *>(p_series);
        xySeries->replace(pointList);
}
    
void PlotData::clearSeries(QAbstractSeries *p_series)
{
        if (p_series) {
            QXYSeries *xySeries = static_cast<QXYSeries *>(p_series);
            xySeries->clear();
        }
}

and inside QML

//QML
ChartView {
	id: chartView
	width: 400
	height: 300
	antialiasing: true
	// Plot line
	LineSeries {
		id: lineSeries
                axisX: axisX
                axisY: axisY
                useOpenGL: true
    }
}

Button {
	id: reload
	onClicked: {
		PlotData.clearSeries(chartView.series(0))  
                PlotData.updateData(chartView.series(0))       
	}
}

Hope it helps.

[milan]

@Mammamia . Thanks for your answer. I do know how to update the existing series. What I do not know is to add "new series", and to remove "existing series" from the chartview from "C++".

[Diracsbracket]

@milan
What about the createSeries method?
https://doc.qt.io/qt-5.11/qml-qtcharts-chartview.html#createSeries-method

[milan]

@Diracsbracket. I know how to add series from QML, I dont know how to add from C++.

[Diracsbracket]

@milan
My bad... it seems I am turning blind and obtuse (again)...

What about this:
https://stackoverflow.com/questions/38467769/add-c-qabstractseries-to-qml-chartview

Instead of instantiating the interfacing object as a QML type as in the example, you probably want to instantiate it in C++ and then pass it to the QML context. This object would emit a signal when the data is ready and the graph needs to be updated.

In your QML you could then use a Connections {} component to connect to that signal and invoke the series-adding JS code from there.