[QChart] The Spline chart has an overshoot in displaying the change in value

[giusdbg]

Hi.

I am testing a dynamic line chart, and I have an overshoot problem in displaying the value change (Y from 6 to 4).

And I can't figure out what is causing it and how to avoid it.

In the image you can see the series of values ​​(without problems) loaded into the chart with

auto xySeries = static_cast<QtCharts::QXYSeries *>(series);

xySeries->replace( dataList );

[giusdbg]

I changed the title, because the problem is related to QSplineSeries, QLineSeries does not have overshoots for value changes.

From what I understand QSplineSeries tries to smooth out value changes, and the overshoots are a side effect of the filter applied to do so.

With QLineSeries