Refreshtest example. How to introduce new data in the circularbuffer.

[Uwe]

These days I have been trying to use the refreshtest example to plot different data (i.e. not a circular buffer)

Then write a class for your type of buffer instead of trying to modify a class, that is written for a different use case ( example code ).
In the end all what your class has to offer is the API how to iterate over the points,

Uwe

[Ethan]

Yes, and that is actually what I am trying to do. Can someone explain me what this line of code does?:

CircularBuffer *buffer = (CircularBuffer *)d_curve->data();

CircularBuffer *buffer = (CircularBuffer *)d_curve->data();

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I know this is a casting, d_curve is a QwtPlotCurve pointer, and data() backs a QwtSeriesData< QPointF > pointer. On the other hand, CircularBuffer inherits from QwtSeriesData<QPointF>. It seems to me that, somehow, with this casting I can use the CircularBuffer methods with the data pointed by a QwtSeriesData<QPointF> pointer. Is that the main reason of this line of code, if not, which is?

Regards,

-E