[Qgis-developer] help with splitGeometry

[luca_manganelli at comune.trento.it]

Martin Dobias <wonder.sk at gmail.com> scritti il 03/03/2010 10.41.12

> Sorry I've misread your question. Splitting by a point is IMHO very
> tricky. It's likely that the point you've specified for splitting lies
> close to the line but doesn't really lie on it due precision errors of
> the representation of floating point numbers. So I think this wouldn't
> generally work. But it shouldn't be a problem to create a very short
> line that crosses the linestring geometry of your interest and splits
> it correctly.

This is the "topological editing". For i.e., Streets layer.

If I draw a line that crosses another line, with "topological editing"
enabled ON Qgis should create 4 features, 2 per line.