PostGeoSQL/ST_GeoAstroideAsymmetrical at main · CM-FOGS/PostGeoSQL · GitHub

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DROP FUNCTION ST_GeoAstroideAsymmetrical(
geom GEOMETRY,
distance float,
direction_degrees_npts numeric,
first_numerator_exponentiation numeric,
first_denominator_exponentiation numeric,
second_numerator_exponentiation numeric,
second_denominator_exponentiation numeric,
third_numerator_exponentiation numeric,
third_denominator_exponentiation numeric,
fourth_numerator_exponentiation numeric,
fourth_denominator_exponentiation numeric)

CREATE OR REPLACE FUNCTION ST_GeoAstroideAsymmetrical(
geom GEOMETRY,
distance float,
direction_degrees_npts numeric,
first_numerator_exponentiation numeric,
first_denominator_exponentiation numeric,
second_numerator_exponentiation numeric,
second_denominator_exponentiation numeric,
third_numerator_exponentiation numeric,
third_denominator_exponentiation numeric,
fourth_numerator_exponentiation numeric,
fourth_denominator_exponentiation numeric)
RETURNS GEOMETRY AS
$BODY$
SELECT ST_Point(ST_X($1)+$2*(COSD($3)^$4/$5)^$6/$7, ST_Y($1)+$2*(SIND($3)^$8/$9)^$10/$11);
$BODY$
LANGUAGE SQL

SELECT ST_SetSrid(ST_MakeLine(ST_GeoAstroideAsymmetrical(geom, 1, i, 1, 1, 1, 1, 1, 1, 1, 1)),4326) geom FROM
(SELECT ST_Point(0, 0) geom) foo CROSS JOIN generate_series (0,360) AS step(i) UNION
SELECT ST_SetSrid(ST_MakeLine(ST_GeoAstroideAsymmetrical(geom, 1, i, 3, 1, 3, 1, 1, 1, 3, 1)),4326) geom FROM
(SELECT ST_Point(0, 0) geom) foo CROSS JOIN generate_series (0,360) AS step(i) UNION
SELECT ST_SetSrid(ST_MakeLine(ST_GeoAstroideAsymmetrical(geom, -1, i, 3, 1, 3, 1, 1, 1, 1, 1)),4326) geom FROM
(SELECT ST_Point(0, 0) geom) foo CROSS JOIN generate_series (0,360) AS step(i);

*Experimental function*