[Qgis-developer] more advanced editing tools
bernhard.stroebl at jena.de
Thu Nov 29 23:04:43 PST 2012
> Hi Bernhard
>> this was requested here, too. Fill hole seems (theoretically) quite simple,
>> the other one is harder:
>> 1) which layers are defined to form the space to be filled. Any line or
>> polygon layer could do it. Maybe one would use the ones that are ticked for
>> avoid intersection.
>> 2) what happens if these layers do not form a closed boundary around the
>> point where the user clicked? how would you detect this?
> actually my suggestion wasn't that advanced:
> * the tool should work on just one layer
in that case the algorithm might be easier: just disoolve all polygons
in the layer into one (spaces are thus converted into holes) and fill
all the holes in it. Might take a while with layers with many or complex
> * the tool should be able to fill all holes and/or spaces (with
> polygons) in one go
that is similar but different from what I had in mind. I was thinking
about the user clicking in a hole or space and just this one is filled.
The algorithm however would be the same.
> * allow the user click on a specific hole/space, fill it (with a
> polygon) and pop-up the dialog for attributes
> there is a plugin (does not seem mantained) that works in a similar
> way, so I guess that it implemets a detection code, anyway it just
> fills holes (not spaces), one at the time, and does not ask to fill
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