Qwt display coordinates label

Hi,

I've read this thread (from almost three years ago): http://www.qtcentre.org/threads/2659...-QLabel-widget.

Now, since then, I was wondering if to display the coordinates of the cursor in some sort of label, if I would need to subclass qwtplotpicker, and reimplement the protected trackerText function, or if since then, Qwt 6.0.1 has a better way of doing this.

If this question has already been answered (I've looked, but you never know), please point me to the question.

Thanks again for your time.

If QwtPicker::trackerText() isn't enough you could install event filter on the canvas and handle the QEvent::MouseMove event.
In there you'll get screen coordinates which you can translate to world coordinates using QwtPlot::invTransform().
Now you can display any of those values wherever you want.
If you need, for example point closest to the cursor along it's y axis, then you need to do some extra calculations but that would be your starting point.

Or use the QwtPlotPicker::selected() signals. Guess you want to use point selection in combination with with a QwtPickerTrackerMachine.

Uwe