Getting data from ChartView after plotting it

[A Former User]

I see I can get the plotted data from the chart after plotting it using this Method:

QPointF at(int index)

https://doc.qt.io/archives/qt-5.10/qml-qtcharts-xyseries.html#append-method

, which :Returns the point at the position specified by index. Returns (0, 0) if the index is not valid.

but I don't know how to use it?

[6thC]

XYSeries is the class you are using inquiring about, it's a base class.
XYSeries is inherited By:
LineSeries, ScatterSeries, and SplineSeries

So your instance of [LineSeries | ScatterSeries | SplineSeries]

ChartView { 
...
LineSeries {
id: series 
...

onSomethingHasToHappen: { var values = series.at(indexToValue); }

[A Former User]

@6thC Thanks it works

[A Former User]

@6thC said in Getting data from ChartView after plotting it:

series.at(indexToValue)

How to get the y element from this array!

[6thC]

@6thC said in Getting data from ChartView after plotting it:

series.at(indexToValue)

var values = series.at(indexToValue);

values object should give you x,y - I assume in a JS array or object with 2 real values? I don't read back only push to charts and I don't use qml to do it as its too slow for me.

This should help, a Qt.point apparently: http://doc.qt.io/qt-5/qml-point.html