[postgis-tickets] [PostGIS] #3960: Unify centroid functions

[PostGIS]

#3960: Unify centroid functions
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 Reporter:  komzpa   |      Owner:  pramsey
     Type:  task     |     Status:  new
 Priority:  medium   |  Milestone:  PostGIS 2.5.0
Component:  postgis  |    Version:  trunk
 Keywords:           |
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 Code currently contains at least three centroid implementations:

 ST_Centroid backing function, calls GEOS, has CIRCULAR* support, no weight
 support:

 https://github.com/postgis/postgis/blob/b8400aeff39419e6e57f61589a66d3bc4f4a6cc5/postgis/lwgeom_geos.c#L1346

 lwgeom_centroid, KMeans backing, calls GEOS, has no CIRCULAR* support
 visible:

 https://github.com/postgis/postgis/blob/8d538e952743acf3e9311e4f576d2afd00ae1fc1/liblwgeom/lwgeom_geos.c#L940

 median init_guess, only points, no GEOS, supports weights:

 https://github.com/postgis/postgis/blob/svn-
 trunk/liblwgeom/lwgeom_median.c#L124

 It looks like all three can be merged and pulled closer together,
 providing a weighted centroid for multipoints and support for CIRCULAR* in
 kmeans.

 Are there any other places?

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Ticket URL: <https://trac.osgeo.org/postgis/ticket/3960>
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