Qt 3.x + Qwt - Advice on programming and plotting.

[Spitfire]

Qwt up to version 6.0.0 (but not including) supports Qt3.
As far as I know online documentation for Qwt is up to date although each source code has documentation current for that version.

Anything can be used for ploting, OpenGL, QGraphicsSceen (but I think you don't have that in Qt3), or simple QWidget (in essence Qwt is QPolygon drawn on QWidget + plenty of convinience functions).
All depends on what kind of performance you're looking for.

Take a look at examples to learn Qwt, unfortunatley documentation is very vague.