[mapserver-users] GEOMTRANSFORM LABELPNT example

[thomas bonfort]

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.

To draw a label at the center of the label text, another geomtransform
would have to be implemented, named e.g. LABELBBOXCENTROID.

regards,
thomas

On Sun, Dec 11, 2011 at 19:34, Brent Fraser <bfraser at 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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