Retaining drawing across paintevents

[angedward3 at gmail.com]

Hi all,

I am sub-classing the paintevent at the moment to create a 2D plot.

I find that I have to re-paint the whole widget every time I call an update(), as I have create a new QPainter() instance. Is there a way to update only a small part of the widget, while retaining the rest of the widget?

Thanks in advance
Ed

BTW if this is the wrong forum to post this, pls let me know.