[Qgis-developer] Re: [Qgis-user] Orphan nodes with GRASS edit plugin

[Radim Blazek]

I have changed it in 0.8 so that the line is deleted if
number of vertices is < 2.

Radim

On 5/2/06, Maciek Sieczka <werchowyna at epf.pl> wrote:
> On Tue, 2 May 2006 12:22:40 +0200
> qgis at rigacci.org wrote:
>
> > > How does this work? ("Delete line" will also delete
> > > boundaries/points/centroids; that's propably why in 0.7.9 it was
> > > renamed to "Delete element").
> >
> > Tried both "Delete vertex" and "Delete line" (the only delete
> > buttons in 0.7.4): no way to remove the dangle vertex.
> >
> > I can reproduce the problem as many times as I want: add a line,
> > then remove vertexes until only one remains. The survivor is
> > undeletable and unmoveable. I have a vector map full of orphan
> > nodes!
> >
> > My be an orphan node is not a line, nor a boundary, point or
> > centroid.
> >
> > Can someone test 0.7.9 on this?
>
> I confirm, using 0.7.9 2006-04-20.
>
> 1. Draw a vector line.
> 2. "Delete vertex" until none left to delete.
> 3. A single red cross remains in Grass digit display. You can't "Delete
> element", "Delete vertex" nor "Move element" etc.
> 4. In Qgis map canvas nothing is displayed. Becomes visible only after
> entering Grass digit.
>
> v.build in Grass says about it:
>
> $ v.build nowa
> Building topology ...
> 1 primitives registered
> Building areas:  100%
> 0 areas built
> 0 isles built
> Attaching islands:
> Attaching centroids:  100%
> Topology was built.
> Number of nodes     :   2
> Number of primitives:   1
> Number of points    :   0
> Number of lines     :   1
> Number of boundaries:   0
> Number of centroids :   0
> Number of areas     :   0
> Number of isles     :   0
>
> If opened in v.digit in Grass, all the symptons 1-4 apply too. So it
> seems like a general issue with Grass vector format. CCing grass devel
> list and Radim.
>
> > May be a bug report should be opened?
>
> Seems a Grass issue rather than Qgis.
>
> Maciek
>
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