QwtPlotPicker trackerText not drawing

[Younes K. <kha...@gm...>]

Hello,

I am trying to draw a rubberband when the user click on some area on the
plot.
I created my custom class that derives from qwtplotpicker and overloaded
trackertext method.
I initialize the picker like this:

pickerPAM_Mx = new customPlotPicker(ui->qwtPlotMxPAM->canvas());

    pickerPAM_Mx->setStateMachine(new QwtPickerClickPointMachine());

    pickerPAM_Mx->setRubberBandPen( QColor( Qt::red ) );

    pickerPAM_Mx->setTrackerPen(QColor( Qt::red ));

    pickerPAM_Mx->setTrackerMode(QwtPicker::ActiveOnly);

    pickerPAM_Mx->setRubberBand( QwtPicker::RectRubberBand );


TrackerText is actually called when I click on some point on the plot,

but nothings shows up, no rubberband.


Am I doing something wrong ?


Best


-- 
Younes Khadraoui, PhD
*Co-Founder at Ostadhi.com | Research Engineer | Data Scientist |
Enterpreneur*