mouse tracking showing float numbers

[d_stranz]

Do you call the QwtPicker::setEnabled( true ) method anywhere?

[fatecasino]

yes,I have an "enablePickerMode" button, which enables/disables the picker.
When I press it I can see that the picker works fine,
i can select a polygon and I can see the plot values (but the float number like e-12 are represented as 0.0000 and the trackerText function is never called)

void my2dPlot::enablePickerMode(bool on)
{
 
    d_picker->setEnabled(on);
 
}

void my2dPlot::enablePickerMode(bool on)
{

    d_picker->setEnabled(on);

}

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[FelixB]

which version of qwt are you using? I have 5.2. Maybe something has changed in 6.0. have a look into the sources of qwtplotpicker.h to and check the declaration of TrackerText()...

[fatecasino]

I use the QWT Release 6.0.

searching in my QWT folder i found this in the qwt_plot_picker.cpp

QwtText QwtPlotPicker::trackerText( const QPoint &pos ) const
{
    return trackerTextF( invTransform( pos ) );
}
 
/*!
  \brief Translate a position into a position string
 
  In case of HLineRubberBand the label is the value of the
  y position, in case of VLineRubberBand the value of the x position.
  Otherwise the label contains x and y position separated by a ',' .
 
  The format for the double to string conversion is "%.4f".
 
  \param pos Position
  \return Position string
*/
QwtText QwtPlotPicker::trackerTextF( const QPointF &pos ) const
{
    QString text;
 
    switch ( rubberBand() )
    {
        case HLineRubberBand:
            text.sprintf( "%.4f", pos.y() );
            break;
        case VLineRubberBand:
            text.sprintf( "%.4f", pos.x() );
            break;
        default:
            text.sprintf( "%.4f, %.4f", pos.x(), pos.y() );
    }
    return QwtText( text );
}

QwtText QwtPlotPicker::trackerText( const QPoint &pos ) const
{
    return trackerTextF( invTransform( pos ) );
}

/*!
  \brief Translate a position into a position string

  In case of HLineRubberBand the label is the value of the
  y position, in case of VLineRubberBand the value of the x position.
  Otherwise the label contains x and y position separated by a ',' .

  The format for the double to string conversion is "%.4f".

  \param pos Position
  \return Position string
*/
QwtText QwtPlotPicker::trackerTextF( const QPointF &pos ) const
{
    QString text;

    switch ( rubberBand() )
    {
        case HLineRubberBand:
            text.sprintf( "%.4f", pos.y() );
            break;
        case VLineRubberBand:
            text.sprintf( "%.4f", pos.x() );
            break;
        default:
            text.sprintf( "%.4f, %.4f", pos.x(), pos.y() );
    }
    return QwtText( text );
}

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is there an obvious reason I cannot overload these functions? should I just go manually and change them?!

---

Added after 15 minutes:

I FOUND IT!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Ι should overload the trackerTextF function and not the trackerText!!!
I realized it when I saw the source code of the qwt_plot_picker

[d_stranz]

I use the QWT Release 6.0.

Oh boy. Another "gotcha" when moving from Qwt 5.x to 6.0. I hope these kinds of things are going to be documented...

Sorry fatecasino, all of our answers were based on Qwt 5.2, where your trackerText() code should have worked perfectly.