[mapserver-users] Labelling Lines with Center justification not owrking as expected.

[Basques, Bob (CI-StPaul)]

Steve,

Doesn’t look like there is a LABEL option avaiable for GEOMTRANSFORM.  All needs to be inside of the STYLE block.  I tried wrapping it in a STYLE block inside of the Label, and got back:

<ServiceException>
msDrawLabelCAche(): General error message. Labels only support LABELPNT and LABELPOLY GEOMTRANSFORMS
</ServiceException>

I also tried “center” and “centroid” as parameters. . . .

bobb




On Aug 24, 2017, at 7:29 PM, Stephen Woodbridge <woodbri at swoodbridge.com<mailto:woodbri at swoodbridge.com>> wrote:

On 8/24/2017 5:47 PM, Basques, Bob (CI-StPaul) wrote:
All,
I’m working on a Parcel Assessment app that will display Parcel edges and which streets they abut.  I’m trying to label each edge of the parcel with it’s Edge length, but the positioning of the labels is not at all what I’m expecting in the output. Here is a sample image:
https://www.dropbox.com/s/ppp1cihnl4flycf/rc_parcels_assessment.02.png?dl=0
The blue lines represent a connection from the center of each of the parcel edge segments being assigned, to the approriate Street/Alley centerline (not shown).  I can’t seem to get the labels to center them selves on the segments.  There should be one distance label centered on each segment at the start of each of the blue lines where they intersect the red parcel edges.
My next workaround would be to use a centroid of the line as the label point.  I think I’ve tried all available combinations of settings in the Mapfile, but maybe I missed something.
Anyone have any ideas?

In the LABEL use a geotransform "center" to create the label point, but this has the problem that you have a point so you have to precompute the ANGLE [angle] in the SQL and make that available to align the label with the edge.

-Steve W

Here is the Label layer for the Parcel edges:
LAYER
NAME 'Parcels-Query-Edges'
STATUS ON
TYPE LINE
METADATA
"ows_title" "Parcels-Query-Edges"
"gml_include_items" "all"
END
CONNECTIONTYPE PostGIS
CONNECTION “***REMOVED***”
DATA "geom from (
select
round(length::numeric,2) round_el,
* from assessment.rc_parcel_segments_no_overlaps
WHERE parcelid = '%pin%'
OR parcelid = '%qstring%'
) as subquery using unique segid srid=200068"
PROJECTION
"init=epsg:200068"
END
CLASSITEM "parcelid"
LABELITEM "round_el"
VALIDATION
'pin' '^[0-9]{12}$'
'qstring' '^[0-9]{12}$'
END
CLASS
STYLE
GEOMTRANSFORM "start"
SYMBOL "circle"
COLOR 255 0 0
SIZE 12
END
STYLE
GEOMTRANSFORM "end"
SYMBOL "circle"
COLOR 255 0 0
SIZE 12
END # STYLE
LABEL
FORCE true
COLOR  255 0 0
OUTLINECOLOR 255 255 255
FONT "arial-bold"
TYPE truetype
SIZE 12
ANGLE auto
POSITION auto
END
END # CLASS
TEMPLATE 'TEMPLATES/empty.html'
END # LAYER
Thanks
bobb
"Reality is merely an illusion, albeit a very persistent one."
   - Albert Einstein
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