Opened 3 months ago
Last modified 2 months ago
#5725 closed defect
Undocumented st_offsetcurve behaviour change between 3.2 and 3.3 — at Initial Version
| Reported by: | gbartonowenstl | Owned by: | pramsey |
|---|---|---|---|
| Priority: | medium | Milestone: | PostGIS GEOS |
| Component: | postgis | Version: | 3.3.x |
| Keywords: | offsetcurve, release notes, st_offsetcurve, reversing | Cc: | gbartonowenstl |
Description
I've read all the release notes and searched the internet generally for this but I cannot find anything.
It appears that between 3.2 and 3.3, st_offsetcurve started reversing the curves when a negative offset was given (the documented behaviour), where as previously it did not.
Reproduction SQL:
select
PostGIS_Version(),
st_startpoint(geom),
st_startpoint(st_offsetcurve(geom, -0.1)),
st_distance(st_startpoint(geom), st_startpoint(st_offsetcurve(geom, -0.1)))
from
(values (st_geomfromtext('LINESTRING (2302997.443737494 116854.4859950367, 2303083.234236186 117132.01622010056)',2163))) as vals (geom)
One env: 3.3 USE_GEOS=1 USE_PROJ=1 USE_STATS=1 POINT (2302997.443737494 116854.4859950367) POINT (2303083.3297756314 117131.98668682482) 290.48759954576633 Older env: 3.2 USE_GEOS=1 USE_PROJ=1 USE_STATS=1 POINT (2302997.443737494 116854.4859950367) POINT (2302997.5392769394 116854.45646176096) 0.10000000013339401
I think this is due to a geos change: https://github.com/dr-jts/geos/commit/7561b50f943305b1419bd655e10e7dcad2cb9492
I'd say this was mostly a bug in the documentation/release notes but I suspect it will cause subtle sadness for many
