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Your IP : 3.21.122.130
CREATE OR REPLACE FUNCTION ST_Letters(letters text, font json DEFAULT NULL)
RETURNS geometry
AS
$$
DECLARE
letterarray text[];
letter text;
geom geometry;
prevgeom geometry = NULL;
adjustment float8 = 0.0;
position float8 = 0.0;
text_height float8 = 100.0;
width float8;
m_width float8;
spacing float8;
dist float8;
wordarr geometry[];
wordgeom geometry;
-- geometry has been run through replace(encode(st_astwkb(geom),'base64'), E'\n', '')
font_default_height float8 = 1000.0;
font_default json = '{
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}';
BEGIN
IF font IS NULL THEN
font := font_default;
END IF;
-- For character spacing, use m as guide size
geom := ST_GeomFromTWKB(decode(font->>'m', 'base64'));
m_width := ST_XMax(geom) - ST_XMin(geom);
spacing := m_width / 12;
letterarray := regexp_split_to_array(replace(letters, ' ', E'\t'), E'');
FOREACH letter IN ARRAY letterarray
LOOP
geom := ST_GeomFromTWKB(decode(font->>(letter), 'base64'));
-- Chars are not already zeroed out, so do it now
geom := ST_Translate(geom, -1 * ST_XMin(geom), 0.0);
-- unknown characters are treated as spaces
IF geom IS NULL THEN
-- spaces are a "quarter m" in width
width := m_width / 3.5;
ELSE
width := (ST_XMax(geom) - ST_XMin(geom));
END IF;
geom := ST_Translate(geom, position, 0.0);
-- Tighten up spacing when characters have a large gap
-- between them like Yo or To
adjustment := 0.0;
IF prevgeom IS NOT NULL AND geom IS NOT NULL THEN
dist = ST_Distance(prevgeom, geom);
IF dist > spacing THEN
adjustment = spacing - dist;
geom := ST_Translate(geom, adjustment, 0.0);
END IF;
END IF;
prevgeom := geom;
position := position + width + spacing + adjustment;
wordarr := array_append(wordarr, geom);
END LOOP;
-- apply the start point and scaling options
wordgeom := ST_CollectionExtract(ST_Collect(wordarr));
wordgeom := ST_Scale(wordgeom,
text_height/font_default_height,
text_height/font_default_height);
return wordgeom;
END;
$$
LANGUAGE 'plpgsql'
SET standard_conforming_strings = ON
IMMUTABLE _COST_MEDIUM PARALLEL SAFE;