How to avoid linking both ends of a Curve Plot

[teratux]

Then I'd suggest you start looking for a memory leak. It could also be that even if you don't have a leak, the constant modification of the curve data (and array length) is causing memory fragmentation. In that case, I would look at using fixed-length arrays where instead of adding or removing points, you simply give a different starting position and number of points by manipulating the pointers you send to the curve plot.

okay, I'll keep it in mind, I'll test again first removing and adding points and if I notice something odd I'll fallback to using a pointer, thanks !!!

[Uwe]

You could inherit from QwtSeriesData. Inside you would have an array of points and a start index. When a new point arrives you simply replace the point at the index and increment the index.
Then all you have to do is to reimplement the sample method in a way, that the start index is taken into count.

Or something similar along this idea

HTH,
Uwe