[mapserver-users] GEOMTRANSFORM LABELPNT example

[Brent Fraser]

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
>>
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