Add outline/shadow to QwtText

[Uwe]

One option might be to add a semitransparent white background - like it is done for tracker text in the spectrogram example.

Otherwise you could try to overload QwtPlotMarker::drawLabel somehow like this:

virtual void YourMarker::drawLabel( QPainter *painter, const QRectF &canvasRect, const QPointF &pos ) const
{
   painter->save();
   painter->setPen( Qt::black );
   QwtPlotMarker::drawLabel( painter, canvasRect, pos + QPointF( -1, 1 ) );
   painter->restore();
 
   QwtPlotMarker::drawLabel( painter, canvasRect, pos  );
}

virtual void YourMarker::drawLabel( QPainter *painter, const QRectF &canvasRect, const QPointF &pos ) const
{
   painter->save();
   painter->setPen( Qt::black );
   QwtPlotMarker::drawLabel( painter, canvasRect, pos + QPointF( -1, 1 ) );
   painter->restore();

   QwtPlotMarker::drawLabel( painter, canvasRect, pos  );
}

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Uwe