Good Morning Simon,
sorry for the late answer. Since I'm not an expert, I had to figure it out.
If I understood right, an iterator setup on a pointset like this
mitk::PointSet::PointsContainer* pointsContainer =
pointSet->GetPointSet()->GetPoints();
mitk::PointSet::PointsContainer::Iterator it;
it = pointsContainer->Begin();
(out of mitk::PointSetWriter::WriteXML())
iterates based on the ID of the points. So if you swap the coordinates, but
not the ID you change the position in the pointset.
You can try it, by saving a PointSet before and after moving a point.
Please correct me, if I'm wrong.
Greetings,
John
Datum: Tue, 03 Aug 2010 17:15:03 +0200
>
> -------- Original-Nachricht --------
>
> Von: Simon Eck <[email protected]>
> An: [email protected]
> Betreff: Re: [mitk-users] QmitkPointListWidget / QmitkPointListView
> behavior when modifying points by key press
>
> Hi John,
>
> thanks for your help. I will consider trying an observer then, although
> i think that using the signal and slot mechanism is a very convenient
> way to communicate with the Qmitk* classes.
>
> Just to make sure, when pressing F2/F3 the coordinates of 2 nearby
> points inside the PointSet are swapped, while their PointSet-ID and also
> their position (when iterating) remains the same.
> This means that the move up / move down slots of the underlying
> QmitkPointListModel are not made for changing the order of points inside
> a PointSet, but rather for exchanging their geometric position?!
>
> Regards,
> Simon
>
>
>
> On 08/03/2010 03:50 PM, Johannes Gaa wrote:
> > Hello Simon!
> >
> > The PointListChanged() signal is supposed to be emitted whenever the
> > PointSet gets cleared or a new PointSet is loaded. So changing the
> order
> > of the points - or more specific: changing the ID of two or more points
> > by swapping their PointSet IDs - won't emit this signal.
> > Maybe the name of the signal isn't the best.
> > Setup an observer on events like that may do it?
> >
> > As I mentioned, by pressing F3/F2 the user swaps the (PointSet-)IDs of
> > two nearby points. In your example the points only change their
> > positions within the ListView, not the PointSet.
> > I agree, that there should be a way to give a point a specific
> > PointSetID via the widget.
> >
> > Greetings,
> > John
> >>
> >> -------- Original-Nachricht --------
> >> Datum: Tue, 03 Aug 2010 09:56:37 +0200
> >> Von: Simon Eck <[email protected]>
> >> An: [email protected]
> >> Betreff: [mitk-users] QmitkPointListWidget / QmitkPointListView
> >> behavior when modifying points by key press
> >>
> >> Dear list,
> >>
> >> I recently tried to react to changes of a mitk::PointSet done by
> >> QmitkPointListWidget. While connecting to signal PointListChanged() of
> >> class QmitkPointListWidget works fine for changes performed by buttons
> >> of the widget (e.g. delete a point), it is currently not emitted by
> >> changes performed by key press events.
> >> I'm not sure if this behavior is desired, but for convenience i
> inserted
> >> an appropriate signal to QmitkPointListView and a slot to
> >> QmitkPointListWidget catching this signal.
> >>
> >> I attached the modifications based on revision 24408 if one wants to
> >> take a look.
> >>
> >>
> >> Another issue i noticed is that when changing the order of points with
> >> QmitkPointSetWidget by using F2 / F3 button, the point identifier
> >> remains at the former index of the pointset, exchanging only the
> >> coordinates. E.g. the pressing F3 on point with identifier 4 in the
> >> following constellation
> >>
> >> 0: (-9.592, -3.257, -1127.020)
> >> 4: (-52.914, -31.455, -1020.490)
> >> 11: (-41.563, 7.705, -1090.180)
> >>
> >> will result in
> >>
> >> 0: (-52.914, -31.455, -1020.490)
> >> 4: (-9.592, -3.257, -1127.020)
> >> 11: (-41.563, 7.705, -1090.180)
> >>
> >> While this may be desired, i expected the following:
> >> 4: (-52.914, -31.455, -1020.490)
> >> 0: (-9.592, -3.257, -1127.020)
> >> 11: (-41.563, 7.705, -1090.180)
> >>
> >>
> >> Best wishes,
> >> Simon
> >>
> >>
> >> --
> >> Simon Eck
> >>
> >> Biomedical Computer Vision Group
> >> Im Neuenheimer Feld 267
> >> 69120 Heidelberg
> >>
> >> [email protected]
> >
> >
> >
> > --
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> >
> >
> >
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