[Qgis-user] edit point coordinates / remove rings

[Tim Sutton]

Hi

Marco could we add the ability to edit multipart features (create /
delete parts). With that and the other things added here I think we
would be pretty well rounded off on the digitising front:

- digitising in streaming mode (capture a vertex for each pixel you pass
over while e.g. shift + leftmouse button is held down)
- manual vertex coordinate entry
- ring and multipolygon island deletion
- create / edit multipart features

I've also been wondering if it won't make more sense to show the vertex
editing markers for the current feature only (following the way udig
does it). This would mean the work flow would change a little in that
you need to first click a feature to select higlight its vertices and
then start to manipulate its geometry. The reason I ask is because when
you have a lot of features in a layer all close to each other it can be
difficult to make out what is going on with all the vertex markers shown
on the screen.

Regards

Tim

On Wed, 2008-11-12 at 17:39 +0100, Marco Hugentobler wrote:
> Hi Borys
> 
> I also think that the possibility to remove rings and  multipolygon islands is 
> important. It needs a few additions in QgsGeometry class and therefore, since 
> it's feature freeze, could go into 1.1.
> 
> Of course no problem to start programming now. Just make a patch against trunk 
> and it can be applied after 1.0 is out (or at least branched).
> 
> Regards,
> Marco   
> 
> On Wednesday 12 November 2008 16:10:17 Borys Jurgiel wrote:
> > > I prefer your idea because your way a user could just keep entering
> > > coordinate pairs to build up a feature without any need for mouse
> > > clicks. Since docs can be stacked / tabbed it neednt consume a lot of
> > > screen real estate. The disadvantage of your idea is that we would
> > > need to implement the concept of a selected vertex probably...
> >
> > Oh yes, I've forgot vertex aren't selectable.
> >
> > Btw. I've realized that there is no way to remove rings and islands. For me
> > it's a critical issue if user can't revert unnecessarily added features.
> >
> > I think it should be easy solvable. Now, if the ring contains only three
> > vertex and user attempts to remove one of them, nothing happens. I suggest
> > to display a confirmation dialog in this case and remove whole ring. I
> > propose the confirmation dialog because the user may not expect this change
> > of behaviour and removing all three vertex in one click.
> >
> > I'm going to fill a ticket, but maybe someone wants to resolve it now ;)
> > _______________________________________________
> > Qgis-user mailing list
> > Qgis-user at lists.osgeo.org
> > http://lists.osgeo.org/mailman/listinfo/qgis-user
> 

-- 
Tim Sutton - QGIS Project Steering Committee Member (Release  Manager)
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