I read through the documentation and through the forum and couldn't find anything covering what I am trying to do but I assume it really shouldn't be as hard as I am making it out to be.

Jists of what I am doing:

Reading in a file of points and placing a QwtSymbol::Cross at each point. The rendering is being done while reading in the file.

Issue that is occuring:

When I go to draw a new QwtSymbol::Cross to the screen it is going back and redrawing every point not just the newest point. I tried "setPaintAttribute(QwtPlotCurve::PaintFiltered );" in hopes to see if that would help in any form of performance. I have overridden the "QwtPlotCurve::draw" and placed all my drawing routines between "painter->save()" and "painter->restore()" in order to try and increase performance but I still haven't found a way to simply only draw the newest points. When I specifically state to only draw the newest points it clears all other points from the screen. Hoping that I am just looking over a quick and easy method to implement this.

Let me know if you need any more information from me and I will try and give what I can. Thanks for reading this over.

Thanks,
Jon