How i can plot result in my GUI ?

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it makes no difference whether you use a polygon or a vector. that has no effect on the style. you can set the style by using "QwtPlotCurve::setStyle (CurveStyle style)".

ok . thank you

you plot exactly one point after each calculation. the previously calculated (and plotted) points will be deleted. is that really what you want? or do you want to keep all points in the plot?

ok! i understand why i must not clear the vector!
=> yes i want to plot one point and keep the previous

thank you for yur help

=> i try, and i will keep informed

EDIT:
i think now i understand the mistake, i try it and i will keep you informed