how to get the coordinates of the curves's points?

[yleesun]

hi everyone!

I used to do QwtPlotCurve curve. Now like to ask how art can be kind of coordinates of the points. When the mouse stops at the point that the point of coordinates. Instead of drawing the curve, do not show. QwtPlotPicker can be used at the coordinates of the mouse, but I need is drawing point coordinates, is there no one can be under the guidance

Edit:Translated to English, please stay with that language.