[mapserver-users] GEOMTRANSFORM LABELPNT example

[Stephen Woodbridge]

Hmmm, I'm curious why the upper left corner of the label polygon shifts 
in your two examples also.

-Steve W

On 12/11/2011 4:01 PM, Brent Fraser wrote:
> 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<bfraser at 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, see
>>> http://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<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
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>> _______________________________________________
>>>>> mapserver-users mailing list
>>>>> mapserver-users at lists.osgeo.org
>>>>> http://lists.osgeo.org/mailman/listinfo/mapserver-users
>>>
>
>
> _______________________________________________
> mapserver-users mailing list
> mapserver-users at lists.osgeo.org
> http://lists.osgeo.org/mailman/listinfo/mapserver-users