[mapserver-users] Label alignment . . .

[Thomas Bonfort]

* Mapserver chooses the longest visible segment to place the label. If
you set the LABEL_NO_CLIP processing keyword, it will select the
longest segment of the underlying feature, whether it is visible or
not.
* There's no such thing as alignment between labels coming from
different features. The alignment keyword is used for centering texct
when it spans multiple lines inside a single label.

regards,
thomas

www.camptocamp.com
+33 4 79 26 57 97



On Thu, May 7, 2009 at 01:52, Bob Basques <Bob.Basques at ci.stpaul.mn.us> wrote:
> All,
>
> I'm playing around with generating a map collar image by labeling some lines
> with MapServer.
>
> I get the labels looking about what I would like them to look like, but the
> alignment vertically ( and this applies to horizontal  alignment as well )
> is not playing nice.
>
> See this link:
> http://gis.ci.stpaul.mn.us/datasets/SHP/FED/USGS/USNG/mn_usng_lines_labels_public_2.map?mapext=503179.6728349806%20111379.8994326578%20508281.0020239575%20135621.41573867595&mapsize=70%20600&mode=map&MOOSETIME=1241653121858
>
> I'm thinking that the labels are moving back and forth horizontally because
> of the underlying line work, It's not strictly horizontal but curved
> slightly, and there may or may not be a vertice visible within a view.  (Can
> a vertice be marked somehow?) So I think MapServer is using the longest
> straight segment within the view to center on for labeling.
>
> Question, how do I get these to line up vertically (and horizontally)?  I
> know there was some recent justification work going on, but didn't follow it
> in detail.
>
> Thanks
>
> bobb
>
> Pertinent mapfile chunks:
>
>   LAYER
>
>     METADATA
>
>           "ows_title" "layer_0"
>
>           "gml_include_items"
>
>           "all"
>
>     END
>
>          NAME 'usng'
>
>     DATA '0000_00/MN_Line_Experiments/MN_USNG_Ramsey_Line_Northing_Beta'
>
>     STATUS DEFAULT
>
>     TYPE LINE
>
>     LABELITEM 'NORTHING'
>
>     CLASS
>
>       LABEL
>
>         TYPE TRUETYPE
>
>         FONT bluehigh
>
>         SIZE 10
>
>         COLOR 25 25 25
>
>         OUTLINECOLOR 255 255 254
>
>         ANGLE 0
>
>         OFFSET -15 -1
>
>         FORCE true
>
>       END
>
>     END
>
>   END
>
>   LAYER
>
>     METADATA
>
>           "ows_title" "layer_0"
>
>           "gml_include_items"
>
>           "all"
>
>     END
>
>          NAME 'usng'
>
>     DATA '0000_00/MN_Line_Experiments/MN_USNG_Ramsey_Line_Northing_Beta'
>
>     STATUS DEFAULT
>
>     TYPE LINE
>
>     LABELITEM 'NORTHING'
>
>     CLASS
>
>       LABEL
>
>         TYPE TRUETYPE
>
>         FONT bluehigh
>
>         SIZE 15
>
>         COLOR 25 25 25
>
>         OUTLINECOLOR 255 255 254
>
>         ANGLE 0
>
>         FORCE true
>
>       END
>
>     END
>
>   END
>
>   LAYER
>
>     METADATA
>
>           "ows_title" "layer_0"
>
>           "gml_include_items"
>
>           "all"
>
>     END
>
>          NAME 'usng'
>
>     DATA '0000_00/MN_Line_Experiments/MN_USNG_Ramsey_Line_Northing_Beta'
>
>     STATUS DEFAULT
>
>     TYPE LINE
>
>     LABELITEM 'NORTHING'
>
>     CLASS
>
>       LABEL
>
>         TYPE TRUETYPE
>
>         FONT bluehigh
>
>         SIZE 10
>
>         COLOR 25 25 25
>
>         OUTLINECOLOR 255 255 254
>
>         ANGLE 0
>
>         OFFSET 14 -1
>
>         FORCE true
>
>       END
>
>     END
>
>     MAXSCALE 5000000
>
>   END
>
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