How to rotate markers in qwt

[alperyazir]

I want to rotate my marker in my plot but i cant. Here is my code to adding images to plot:

QPixmap pixmap("image");
 
        QwtSymbol *symbol = new QwtSymbol;
        symbol->setPixmap(pixmap);
 
        marker = new QwtPlotMarker;
        marker->setSymbol( symbol);
        marker->attach(this);

QPixmap pixmap("image");

        QwtSymbol *symbol = new QwtSymbol;
        symbol->setPixmap(pixmap);

        marker = new QwtPlotMarker;
        marker->setSymbol( symbol);
        marker->attach(this);

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I tried to rotate with QTransform but i couldnt achive. Is there any trick to solve this problem?

Thanks.