[postgis-devel] ST_MinimumBoundingRadius / Diameter

[Bruce Rindahl]

What are they asking for?  The list of vertices from a polygon that touch
the minimum bounding circle?
That is straight forward with existing functions
polygon -> point collection ->MBR center, diameter ->point collection where
st_distance(point,center) = diameter/2 (less a little bit for rounding
errors)

I can fire up a function and example if needed.

On Wed, Aug 14, 2019 at 8:55 AM Paul Ramsey <pramsey at cleverelephant.ca>
wrote:

> In response to a user query on the list, about the actual extrema points
> of a set of points, we looked at the minimum bounding circle calculation,
> and it *almost* returns the answer… but the center and radius don’t quite
> give you the extrema.
>
> CREATE OR REPLACE FUNCTION ST_MinimumBoundingRadius(geometry, OUT center
> geometry, OUT radius double precision)
>         AS 'MODULE_PATHNAME', 'ST_MinimumBoundingRadius'
>         LANGUAGE 'c' IMMUTABLE STRICT _PARALLEL
>         _COST_HIGH;
>
> I was wondering whether to add Yet Another Function or just change the
> signature of this function to include an ‘OUT diameter geometry’ linestring.
>
> Thoughts?
>
> P
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