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-- gnomonic projection and its inverse
CREATE OR REPLACE FUNCTION gnomonic_proj(spoint, spoint)
RETURNS point
AS 'MODULE_PATHNAME'
LANGUAGE C IMMUTABLE STRICT PARALLEL SAFE;
COMMENT ON FUNCTION gnomonic_proj(spoint, spoint) IS
'gnomonic projection, the second argument is the tangential point';
CREATE OR REPLACE FUNCTION gnomonic_inv(point, spoint)
RETURNS spoint
AS 'MODULE_PATHNAME'
LANGUAGE C IMMUTABLE STRICT PARALLEL SAFE;
COMMENT ON FUNCTION gnomonic_inv(point, spoint) IS
'inverse of gnomonic projection, the second argument is the tangential point';
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