QWidget item in QGraphicsScene

[wysota]

Qwt is basically tightly coupled with widgets. You can create a plot as a widget, show it on the screen, grab its contents using QWidget::grabWidget(), hide the widget and use the pixmap created to render it onto a graphics item. It will be quite slow though, so if you want to have something close to real-time updates, I suggest you implement your own plotting as a graphics item directly, especially that you'll be able to use many features it has and which are not handled by Qwt (like the level of detail).

[Uwe]

Curves, spectrograms, markers .. are QwtPlotItems - no widgets. I´m pretty sure that it wouldn't be very difficult to embedd them in a QGraphicsItem.

But maybe it´s enough to implement the chemical primitives as QwtPlotItems, painting them on the QwtPlot canvas. I wouldn´t expect much difference in writing the painting code for a new type of QwtPlotItem compared to writing it for a QGraphicsItem.

QGV and Qwt are both frameworks for graphic primitives. But without a deeper knowledge about the requirements of an application it is hard to recommend which one should be used.

Uwe

@wysota: sometimes not answering is the better idea.