Bug report #21282
[Expression] point_n function should be coherent with other vertex based functions and algorithms
|Affected QGIS version:||3.7(master)||Regression?:||No|
|Operating System:||Easy fix?:||No|
|Pull Request or Patch supplied:||No||Resolution:|
|Crashes QGIS or corrupts data:||No||Copied to github as #:||29100|
I don't know if I should report it as a bug or a feature request...
The point_n function returns a specific node on a geometry, based on the provided index. The first vertex index is 1.
But when using Processing to extract vertices from a feature, the vertex_index is 0-based. Some other expression that manipulates vertices (angle_at_vertex, distance_to_vertex) are also 0-based.
It could be nice to align the point_n function with the others.
#2 Updated by Mathieu Pellerin - nIRV over 1 year ago
- Regression? set to No
- Crashes QGIS or corrupts data set to No
- Affected QGIS version set to 3.7(master)
- Tracker changed from Feature request to Bug report
IMHO, it's an inconsistency which should be considered as a bug. Fixing this will have to wait until we cross the QGIS 4.0 bridge.