display data for plot items on QwtPolarPlot with mouse hover

[sunburns]

I want to place shapes on a QwtPolarPlot. When the user hovers the mouse on an item, I want to display that item's azimuth and radius. Can someone point me in the right direction for this? An example would be great.

[stepner03]

You can use the QwtPiker , so by right-clicking you can obtain the value

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Added after 7 minutes:

Example:

class MyPicker: public QwtPolarPicker
{
public:
MyPicker( QwtPolarCanvas *canvas ):
QwtPolarPicker( canvas )
{
setStateMachine( new QwtPickerDragPointMachine() );
setRubberBand( QwtPicker::NoRubberBand );
setTrackerMode( ActiveOnly );
}

virtual QwtText trackerTextPolar( const QwtPointPolar &pos ) const
{
QColor bg( Qt::white );
bg.setAlpha( 200 );

..........................
.......................
.....................
QwtText text = QwtPolarPicker::trackerTextPolar( pos );

text.setBackgroundBrush( QBrush( bg ) );
return text;
}
};

where the dots .................. you can possibly perform a processing on your current location.

picker = new MyPicker( ui->myqwtPolarPlot->canvas() );
picker->setMousePattern( QwtEventPattern::MouseSelect1, Qt::RightButton );

[sunburns]

Perfect. Thanks.

[stepner03]

Anything ... even I'm fighting with QT