Draw a circle or sequare/rectange by mouse on qwtpolt???

[jesse_mark]

i edite my code and i was able to see the rect on my plot, but when i finisd the rect disappear , i would like to keep it shown and have access to its valus(points)

picker = new QwtPlotPicker(QwtPlot::xBottom,QwtPlot::yLeft,this->canvas());
   // picker->setStateMachine(new QwtPickerTrackerMachine);
    picker->setStateMachine(new QwtPickerClickRectMachine);
    picker->setTrackerMode(QwtPicker::ActiveOnly);
    picker->setTrackerPen(QColor(Qt::white));
 
    picker->setRubberBand(QwtPicker::RectRubberBand);
    picker->setRubberBandPen(QColor(Qt::green));

picker = new QwtPlotPicker(QwtPlot::xBottom,QwtPlot::yLeft,this->canvas());
   // picker->setStateMachine(new QwtPickerTrackerMachine);
    picker->setStateMachine(new QwtPickerClickRectMachine);
    picker->setTrackerMode(QwtPicker::ActiveOnly);
    picker->setTrackerPen(QColor(Qt::white));

    picker->setRubberBand(QwtPicker::RectRubberBand);
    picker->setRubberBandPen(QColor(Qt::green));

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