St_Centroid doesn't work on curved geom

[remic]

When trying SELECT ST_AsText(ST_centroid(geom)) FROM st_geomfromtext('circularstring(0 0 , 1 1, 2 0)') as geom

Error is: ERROR: Exception in LWGEOM2GEOS: curved geometry not supported.

Centroid of such a curve would only be centroid(ST_DumpPoints(circularstring)) , so maybe easy to add?

[remic]

After some thinking : better define the centroid as the centroid of (point1, point3). Cheers, Rémi-C

[remic]

Here is a wrapper , totally non optimal

DROP FUNCTION IF EXISTS public.rc_centroid( igeom GEOMETRY); CREATE OR REPLACE FUNCTION public.rc_centroid(

igeom GEOMETRY ) RETURNS GEOMETRY AS

$BODY$

--@brief : this function is a thin wrapper around st_centroid than enable to use it with circularstring --@param : a geom whose centroid we want --@return : teh centroid

DECLARE BEGIN

--RAISE EXCEPTION 'hello, % , %', st_astext(igeom), st_geometrytype(igeom) ;

IF ST_GeometryType(igeom) ILIKE '%CircularString%' THEN

--special case, we cast the circularstring to multipoint

RETURN ST_Centroid(ST_Collect(dmp.geom)) FROM ST_DumpPoints(igeom) as dmp WHERE dmp.path =ARRAY[1] OR dmp.path =ARRAY[3];

END IF ; --cicular string

RETURN ST_Centroid(igeom) ;

END ;

--test --SELECT ST_AsText(rc_centroid(geom )) --FROM st_geomfromtext('circularstring(0 0 , 1 1, 2 0)') as geom ;

$BODY$

LANGUAGE plpgsql IMMUTABLE STRICT;

[pramsey]

Done at r13764