Moving plot marker with the mouse

Hi,

I want to move a QwtPlotMarker (vertical) when I click on it, and move it while the mouse button is down. Of course, the marker should follow the mouse cursor.

What is the easiest way to achieve this ?

Regards,

I would implement it as a combination of a QwtPlotMarker and a QwtPlotPicker.

Uwe

Hi Uwe, I am trying to achieve exactly the same thing, however I'm quite new to Qwt and I need more help.

Can you please give me a few hints about how to set up the picker to display the vertical movement marker and to emit the event after the movement is complete?

Code:

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m_picker = new QwtPlotPicker(m_amp->canvas());
m_picker->setTrackerMode(QwtPicker::AlwaysOn);
m_picker->setRubberBand(QwtPicker::VLineRubberBand);
m_picker->setSelectionFlags(QwtPicker::PointSelection | QwtPicker::ClickSelection);
connect(m_picker, SIGNAL(selected(const QwtDoublePoint&)), this, SLOT(Clicked(const QwtDoublePoint&)) );

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