Hi,
I use QgsGeometry.intersection() and QgsGeometry.difference() in the
DigitizingTools plugin (cutter/clipper) and I did never experience any
errors in these functions no matter if the geometries share a vertex or
not (neither during my tests nor during courses I gave nor in the bug
tracker). So I wouldn't say this is generally true. I wonder, however,
why it seems to be a problem in processing.
Bernhard
Am 17.03.2016 um 23:19 schrieb Maximilian Krambach:
Hi,
I've frequently stumbled upon the problem that several functions (like
geomentry().intersection(geometry2), geometry().touches(geometry2) only
return something useful if BOTH geometries have a vertex at the meeting
point (which is inherited from GEOS)
My expection: they do intersect or touch if they share space.
I am Getting: Only a result if they share at least a vertex.
This results in tools like geoprocessing:intersection or clip giving
strange/unintuitive outputs.
Is it a design decision or just never discussed? It could be solved
quite easily, (see https://hub.qgis.org/issues/14504#note-2)
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