problem with dot style

[21did21]

Now i have a problem to change the symbol of this curve...

for the moment i have several dots, it's nice but i want to change dots by triangle

I have done this in my constructor:

MySymbol =new QwtSymbol();
MySymbol->Triangle;
mycurve->setStyle( QwtPlotCurve::Dots );
mycurve->setSymbol( MySymbol );

MySymbol =new QwtSymbol();
MySymbol->Triangle;
mycurve->setStyle( QwtPlotCurve::Dots );
mycurve->setSymbol( MySymbol );

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My curve always have dots and Triangles are not taken into account i have always Dots.

=> if i erase this line:

mycurve->setStyle( QwtPlotCurve::Dots );

mycurve->setStyle( QwtPlotCurve::Dots );

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my curve don't appears,

So i think i haven't understand the difference between style and symbol, i don't want line but i want to change Dots by triangle

i hope you can help me

thank a lot

[21did21]

it's work now but i superpoze dots and triangles...