[postgis-users] Dynamic Bounding boxes

[Obe, Regina]

I'm just wandering about this since I have found work-arounds for this
so its not much of a bother aside from when loading a new db.
 
Is there a technical reason why we don't allow casting a BOX from a
dynamic string (text) although you can from a static string (cstring).
 
e.g.
 I can do this:
ST_SetSRID(CAST('BOX(33863.73046875 777606.3125,35348.73046875
778517.3125)' as box2d), 26986)

But I can not do this

ST_SetSRID(CAST('BOX(33863.73046875 777606.3125 ' || ',35348.73046875
778517.3125)' as box2d), 26986)

--To get around this minor inconvenience I've been using a function like
this

CREATE FUNCTION pgis_makeboxgeom(xmin float, ymin float, xmax float,
ymax float, SRID int) 
RETURNS geometry As
$$
SELECT ST_GeomFromText('POLYGON((' || $1 || ' ' || $2 || ',' || $1 ||  '
' || $4 || ',' || $3 || ' ' || $4 || ', ' || $3 || ' ' || $2 || ',' ||
$1 || ' ' || $2 || '))', $5)
$$
language 'sql' IMMUTABLE STRICT;

SO I can create dynamic boxes using syntax like this.

SELECT
pgis_makeboxgeom(33863.73046875,777606.3125,35348.73046875,778517.3125,
26986)


Thanks,
Regina



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