Retrieve Curve values

[nenukino]

HI all,

I have several QwtPlotCurve objects and a QwtPlotPicker object on my graph, QwtPlotPicker send the x,y value inside the canvas where I click , and I would like to know if there is a way to retrieve the real values of the curve using the values (coordinates x,y ) send by QwtPlotPicker object.

look at the picture attached, when I click inside the canvas I need to display next to each curve the value where the mark intersect the curve.

If someone had done something like this I really appreciate any help.