[Qgis-developer] Automate snapping after insert of a new feature

[francescoboccacci at libero.it]

Hi all,
i have a question for you. I'd like to have a new function in my plugin that makes an autime snapping if a start point or end point of a new feature inserted is closed to a vertex or segment base on a values setted ina configuration file.
>From plugin console:

l = iface.activeLayer()  --activeLayer
f = l.selectedFeatures()[0] -- new fetaure inserted
start = f.geometry().asPolyline()[0] -- get the start point (the point that i would like to snap to a segment)
result = l.snapWithContext(start,10,QgsSnapper.SnapToVertexAndSegment) -- i use
result
(0, {0.0: [<qgis._core.QgsSnappingResult object at 0x0000000018B9C400>], 0.09699529788394015: [<qgis._core.QgsSnappingResult object at 0x0000000018B9C620>]})

I notice that the key 0.09699529788394015 is the effective distance between my start point and the segment.
My question is:
How can i modify the feature geometry to snap to the segment according to result?

Thanks

Francesco
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