Brent,
Ok, we had been using an earlier version of the mapserver
documentation we had downloaded which had the text below.
The latest version now describes the discussed functionally more closely.
We had been looking at using the previous functionally to draw and
rotate a symbol around the label text. Not what we are thinking but
this could be used for something like displaying the wind speed and
symbol rotated for the wind direction using a symbol around the outside.
To do this it sounds like a new GEOMTRANSFORM type.
Thanks
Ian
STYLE The start of a STYLE object.
Label specific mechanisms of the STYLE object are the GEOMTRANSFORM
options:
GEOMTRANSFORM [labelpnt|labelpoly] Creates geometries that can be used
for styling the label.
. labelpnt generates a point with its center at the middle of the
bounding rectangle of the text.
. labelpoly generates the bounding rectangle for the text, with 1
pixel of padding added in all directions.
The resulting geometries can be styled using the mechanisms available
in the STYLE object.
New in version 6.0.
*From:*Brent Fraser [mailto:bfra...@geoanalytic.com]
*Sent:* Sunday, December 11, 2011 1:52 PM
*To:* Ian Walberg
*Cc:* mapserver-users@lists.osgeo.org
*Subject:* Re: [mapserver-users] GEOMTRANSFORM LABELPNT example
Ian,
No, there is no ability to do that, unless you use POSITION CC.
There had been some discussion several months ago to add functions to
the GEOMTRANSFORM resulting in RFC 72
(http://www.mapserver.org/development/rfc/ms-rfc-72.html)
I think something like
GEOMTRANSFORM (getCentroid(labelpoly))
would be a good addition, but I don't have a specific use-case. What
were you planning to do the center of the label polygon?
Best Regards,
Brent Fraser
On 12/11/2011 2:18 PM, Ian Walberg wrote:
So is it expected that labelpnt generates a point with its center at the middle
of the bounding rectangle of the text?
Thanks
Ian
-----Original Message-----
From:mapserver-users-boun...@lists.osgeo.org
<mailto:mapserver-users-boun...@lists.osgeo.org>
[mailto:mapserver-users-boun...@lists.osgeo.org] On Behalf Of Brent Fraser
Sent: Sunday, December 11, 2011 1:02 PM
To: thomas bonfort
Cc:mapserver-users@lists.osgeo.org <mailto:mapserver-users@lists.osgeo.org>
Subject: Re: [mapserver-users] GEOMTRANSFORM LABELPNT example
Thomas,
I tracked it down to the LABELCACHE setting.
LABELCACHE ON gives the expected results LABELCACHE OFF gives my old blue-dot-on-the-left results.
See attached PDFs.
Best Regards,
Brent Fraser
On 12/11/2011 1:05 PM, thomas bonfort wrote:
There might have been a bug in the initial implementation. trying it
out with current trunk gives me the expected result, unless I'm
missing something.
On Sun, Dec 11, 2011 at 20:44, Brent Fraser<bfra...@geoanalytic.com>
<mailto:bfra...@geoanalytic.com> wrote:
Thomas,
See comments below.
Best Regards,
Brent Fraser
On 12/11/2011 12:26 PM, thomas bonfort wrote:
I think this is all expected behavior, although the documentation
may be incorrect.
LABELPNT draws a marker on the geographic position the label is
attached to. This corresponds to the center of the label text only
if the label is in position CC.
I think that is what is intended but my original test case (using CC
) resulted in the LABELPNT rendered on the left side of the
labelpoly,
seehttp://lists.osgeo.org/pipermail/mapserver-dev/attachments/20110526/47c9bc8c/labelpnt-0001.png.
I had expected it to be coincident with the yellow circle and green
cross.
To draw a label at the center of the label text, another
geomtransform would have to be implemented, named e.g.
LABELBBOXCENTROID.
or maybe
GEOMTRANSFORM (centroid([LABELPOLY]))
regards,
thomas
On Sun, Dec 11, 2011 at 19:34, Brent Fraser<bfra...@geoanalytic.com>
<mailto:bfra...@geoanalytic.com>
wrote:
Hey Jeff,
I've been looking into this too (not finished yet). I'm
using
v6.0.1 and can reproduce my original results (blue dot to the
left)
AND Ian's (grey dot coincident with white dot). Very strange.
My
shapefile dataset gets reprojected from geographic to UTM, so
that
may be causing the difference.
I need to look into that...
Best Regards,
Brent Fraser
On 12/11/2011 10:57 AM, Jeff McKenna wrote:
On 11-12-11 11:20 AM, Ian Walberg wrote:
Here is the map file we are using ms4w 3.0.3.
We thought the larger grey circle should be drawn in
the center
of the label text.
What have we done wrong?
I have done some testing on this on Windows, with MapServer
trunk
(6.1-dev), here are my findings:
- I used Brent's original example styles (from
http://osgeo-org.1803224.n2.nabble.com/GEOMTRANSFORM-labelpnt-location-td6408065.html)
with Ian's FEATURE layer --> Brent's "Blue Dot"
LABELPNT with POSITION
CC is
now correctly placed in the center of the label text (so it
seems
this has been fixed in the code, but I can't find the
ticket that
says that)
- If I change to POSITION LR (as in Ian's example layer)
then I
get Ian's issue (LABELPNT is placed at the geometry
location, not
in the center of the label text
- but this is now an issue of understanding the developer's
logic
(from that thread SteveL says "Let me ponder this and get
back to
you. I think it makes sense to use the label point
geotransform
only with position CC so that it matches actual shape
location.")
That's all I know at this point (ha pun).
-jeff
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