
WITH input(geom) AS (
  VALUES ('Polygon((0 0, 100 0, 99 98, 0 100, 0 0))'::geometry)
), mic AS (
  SELECT geom, result.*
  FROM input
  CROSS JOIN LATERAL ST_MaximumInscribedCircle(geom) AS result
)
SELECT 'mic-box' AS name,
       st_astext(center, 1) AS center,
       ST_DWithin(nearest, ST_Boundary(geom), 1e-9) AS nearest_on_boundary,
       round(ST_Distance(center, nearest)::numeric, 1) =
         round(radius::numeric, 1) AS nearest_at_radius,
       round(radius::numeric,1) AS radius
FROM mic;

SELECT 'mic-empty' AS name,
       st_astext(center, 4) AS center,
       st_astext(nearest, 4) AS nearest,
       round(radius::numeric,4) AS radius
FROM ST_MaximumInscribedCircle('Polygon Empty'::geometry);

SELECT 'mic-null' AS name, center, nearest, radius
FROM ST_MaximumInscribedCircle(NULL);

SELECT 'mic-line' AS name,
       st_astext(center, 4) AS center,
       st_astext(nearest, 4) AS nearest,
       round(radius::numeric,4) AS radius
FROM ST_MaximumInscribedCircle('LINESTRING(0 0, 100 0, 99 98, 0 100, 0 0)'::geometry);

SELECT 'mic-mpoint' AS name,
       st_astext(center, 4) AS center,
       st_astext(nearest, 4) AS nearest,
       round(radius::numeric,4) AS radius
FROM ST_MaximumInscribedCircle('MULTIPOINT(0 0, 100 0, 99 98, 0 100, 0 0)'::geometry);

SELECT 'mic-point' AS name,
       st_astext(center, 4) AS center,
       st_astext(nearest, 4) AS nearest,
       round(radius::numeric,4) AS radius
FROM ST_MaximumInscribedCircle('POINT(0 0)'::geometry);

WITH p AS (
	SELECT 'Polygon((0 0, 100 0, 99 98, 0 100, 0 0))'::geometry AS ply
)
SELECT 'mic-cte' AS name, ST_AsText(st_snaptogrid((ST_MaximumInscribedCircle(ply)).center,0.1))
	FROM p;

-- ST_ReducePrecision
SELECT 'rp-1', ST_AsText(ST_ReducePrecision('POINT(1.412 19.323)', 0.1));
SELECT 'rp-2', ST_AsText(ST_ReducePrecision('POINT(1.412 19.323)', 1.0));
SELECT 'rp-3', ST_AsText(ST_ReducePrecision('POINT(1.412 19.323)', 10));

-- ST_MaximumInscribedCircle infinite check https://trac.osgeo.org/postgis/ticket/5318
SELECT '#5318', ST_MaximumInscribedCircle('0106000020E61000000100000001030000000100000005000000000000000000F07F000000000000F07F000000000000F07F000000000000F07F000000000000F07F000000000000F07F000000000000F07F000000000000F07F000000000000F07F000000000000F07F'::geometry) As result;

-- ST_LargestEmptyCircle
SELECT 'lec-1', round(radius::numeric,3),
  ST_AsText(center,3) AS center,
  ST_AsText(nearest,3) AS nearest
FROM ST_LargestEmptyCircle(
  'MULTIPOINT ((4 3), (7 6), (4 6))');
