Andy
I've been trying the changes you suggested without success.
I get an error when I use the + operator (and also if I leave out temp_).
Perhaps I don't understand the use of st_y, st_x max and min.
I don't want to change the entity merley move it from where it is to the
center of an established geometry (box).
Here's the function as it now stands. I still get 0 rows affected and the
two tables do have geometries (one entity in process_dgm and one box in
spatial_ref where position = 2) in them.
Insert into temp_ (the_geom)
Select st_translate (st_translate(graphics.process_dgm.the_geom,
st_x (st_centroid(graphics.process_dgm.the_geom)) - st_x (st_centroid
(spatial_ref.the_geom)),
st_y (st_centroid(graphics.process_dgm.the_geom)) - st_y (st_centroid
(spatial_ref.the_geom))),
( st_xmax(graphics.process_dgm.the_geom) -
st_xmin(graphics.process_dgm.the_geom)),
( st_ymax(graphics.process_dgm.the_geom) -
st_ymin(graphics.process_dgm.the_geom)))
from graphics.process_dgm, spatial_ref, temp_
where graphics.process_dgm.description = 'Tank'
and spatial_ref.position_ = 2 ;
Bob
----- Original Message -----
From: "Andy Anderson" <[EMAIL PROTECTED]>
To: "PostGIS Users Discussion" <[email protected]>
Sent: Sunday, June 08, 2008 7:25 PM
Subject: Re: [postgis-users] Creating a Flow Diagram
On Jun 8, 2008, at 5:14 PM, Bob Pawley wrote:
I 'm playing with a variation of the st_translate function we were
discussing last week.
I have created two boxes (spatial_ref) and I wish to place an entity
(graphics.process_dgm) into the temp_ table with the coordinates that
centers the entity in a specific one of these boxes.
Here's the code that I have come up with but so far it produces 0 rows.
Insert into temp_ (the_geom)
Select st_translate(st_translate (graphics.process_dgm.the_geom,
st_y (st_centroid(graphics.process_dgm.the_geom)) - st_x (st_centroid
(spatial_ref.the_geom)),
The first function here should be "st_x", not "st_y".
st_y (st_centroid(graphics.process_dgm.the_geom)) - st_y (st_centroid
(spatial_ref.the_geom))),
( st_xmax(graphics.process_dgm.the_geom) -
st_xmin(graphics.process_dgm.the_geom)),
( st_ymax(graphics.process_dgm.the_geom) -
st_ymin(graphics.process_dgm.the_geom)))
I don't see anything wrong with this, but you should be able to make a
single st_translate call here since max - min won't change in a
translation, e.g.
(st_y (st_centroid(graphics.process_dgm.the_geom)) - st_x (st_centroid
(spatial_ref.the_geom))) + ( st_xmax(graphics.process_dgm.the_geom) -
st_xmin(graphics.process_dgm.the_geom))
So after matching the centroids you're trying to move the lower left
corner of the bounding box to its upper right corner?
from graphics.process_dgm, spatial_ref, temp_
I don't think you need the ", temp_", but it probably doesn't hurt.
where graphics.process_dgm.description = 'Tank'
and spatial_ref.position_ = '2';
Is spatial_ref.position_ text? If it's an integer, drop the quotes.
-- Andy
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