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-- **************************
--
-- spherical point functions
--
-- **************************
CREATE FUNCTION pg_sphere_version()
RETURNS CSTRING
AS 'MODULE_PATHNAME', 'pg_sphere_version'
LANGUAGE 'c';
CREATE FUNCTION spoint(FLOAT8, FLOAT8)
RETURNS spoint
AS 'MODULE_PATHNAME', 'spherepoint_from_long_lat'
LANGUAGE 'c'
IMMUTABLE STRICT PARALLEL SAFE;
CREATE FUNCTION spoint_deg(FLOAT8, FLOAT8)
RETURNS spoint
AS 'MODULE_PATHNAME', 'spherepoint_from_long_lat_deg'
LANGUAGE 'c'
IMMUTABLE STRICT PARALLEL SAFE;
CREATE FUNCTION set_sphere_output_precision(INT4)
RETURNS CSTRING
AS 'MODULE_PATHNAME', 'set_sphere_output_precision'
LANGUAGE 'c';
CREATE FUNCTION reset_sphere_output_precision()
RETURNS CSTRING
AS 'MODULE_PATHNAME', 'reset_sphere_output_precision'
LANGUAGE 'c';
CREATE FUNCTION set_sphere_output(CSTRING)
RETURNS CSTRING
AS 'MODULE_PATHNAME', 'set_sphere_output'
LANGUAGE 'c';
COMMENT ON FUNCTION spoint(FLOAT8, FLOAT8) IS
'returns a spherical point from longitude (arg1), latitude (arg2)';
COMMENT ON FUNCTION spoint_deg(FLOAT8, FLOAT8) IS
'returns a spherical point from longitude (arg1, in degrees), latitude (arg2, in degrees)';
CREATE FUNCTION long(spoint)
RETURNS FLOAT8
AS 'MODULE_PATHNAME', 'spherepoint_long'
LANGUAGE 'c'
IMMUTABLE STRICT PARALLEL SAFE;
COMMENT ON FUNCTION long(spoint) IS
'longitude of spherical point';
CREATE FUNCTION lat(spoint)
RETURNS FLOAT8
AS 'MODULE_PATHNAME', 'spherepoint_lat'
LANGUAGE 'c'
IMMUTABLE STRICT PARALLEL SAFE;
COMMENT ON FUNCTION lat(spoint) IS
'latitude of spherical point';
CREATE FUNCTION x(spoint)
RETURNS FLOAT8
AS 'MODULE_PATHNAME', 'spherepoint_x'
LANGUAGE 'c'
IMMUTABLE STRICT PARALLEL SAFE;
COMMENT ON FUNCTION x(spoint) IS
'cartesian x value of spherical point';
CREATE FUNCTION y(spoint)
RETURNS FLOAT8
AS 'MODULE_PATHNAME', 'spherepoint_y'
LANGUAGE 'c'
IMMUTABLE STRICT PARALLEL SAFE;
COMMENT ON FUNCTION y(spoint) IS
'cartesian y value of spherical point';
CREATE FUNCTION xyz(spoint)
RETURNS FLOAT8[]
AS 'MODULE_PATHNAME', 'spherepoint_xyz'
LANGUAGE 'c'
IMMUTABLE STRICT PARALLEL SAFE;
COMMENT ON FUNCTION xyz(spoint) IS
'cartesian values of spherical point';
CREATE FUNCTION z(spoint)
RETURNS FLOAT8
AS 'MODULE_PATHNAME', 'spherepoint_z'
LANGUAGE 'c'
IMMUTABLE STRICT PARALLEL SAFE;
COMMENT ON FUNCTION z(spoint) IS
'cartesian z value of spherical point';
-- ***************************
--
-- spherical point operators
--
-- ***************************
--
-- equal
--
CREATE FUNCTION spoint_equal(spoint, spoint)
RETURNS BOOL
AS 'MODULE_PATHNAME', 'spherepoint_equal'
LANGUAGE 'c'
IMMUTABLE STRICT PARALLEL SAFE;
COMMENT ON FUNCTION spoint_equal(spoint, spoint) IS
'returns true, if spherical points are equal';
CREATE OPERATOR = (
LEFTARG = spoint,
RIGHTARG = spoint,
COMMUTATOR = =,
NEGATOR = <>,
PROCEDURE = spoint_equal,
RESTRICT = contsel,
JOIN = contjoinsel
);
COMMENT ON OPERATOR = (spoint, spoint) IS
'true, if spherical points are equal';
--
-- not equal
--
CREATE FUNCTION spoint_equal_neg (spoint, spoint)
RETURNS BOOL
AS 'SELECT NOT spoint_equal($1,$2);'
LANGUAGE 'sql'
IMMUTABLE STRICT PARALLEL SAFE;
COMMENT ON FUNCTION spoint_equal_neg (spoint, spoint) IS
'returns true, if spherical points are not equal';
CREATE OPERATOR <> (
LEFTARG = spoint,
RIGHTARG = spoint,
COMMUTATOR = <>,
NEGATOR = =,
PROCEDURE = spoint_equal_neg,
RESTRICT = contsel,
JOIN = contjoinsel
);
COMMENT ON OPERATOR <> (spoint, spoint) IS
'true, if spherical points are not equal';
--
-- distance between points
--
CREATE FUNCTION dist(spoint, spoint)
RETURNS FLOAT8
AS 'MODULE_PATHNAME', 'spherepoint_distance'
LANGUAGE 'c'
IMMUTABLE STRICT PARALLEL SAFE;
COMMENT ON FUNCTION dist(spoint, spoint) IS
'distance between spherical points';
CREATE OPERATOR <-> (
LEFTARG = spoint,
RIGHTARG = spoint,
COMMUTATOR = '<->',
PROCEDURE = dist
);
COMMENT ON OPERATOR <-> (spoint, spoint) IS
'distance between spherical points';
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