Hi,

I have a QwtPlot showing several QwtPlotCurves.
As the y-values of the curves are spread over a big range, the curves are created by applying a scale factor to the values. That means i.e. curve 1 is created with values divided by 100, curve 2 is created with values multiplied by 10 and so on.
(By the way, I use only one y-axis as the number of curves can change dynamically. The data unit as well as the scale factor are indicated at the legend, i.e. [ft / 100])
For better user friendlyness it's needed to indicate the correct original y-value when the mouse is pointing to a certain curve, i.e. 12'300ft. For that purpose I need to figure out the curve the mouse is pointing to in order to apply the correct scale factor to the transformed value.

Any idea about that?
Thank's in advance.

Best Regards
Stefan