[mapserver-users] Constraining label position

[Jan Hartmann]

That's it, thanks Thomas. It's a problem with the development version of 
OpenLayers, where during a map refresh the old version remains visible 
for some time next to the updated one, in order to get a smooth 
transition. I find intelligent labelpositioning more important than 
smooth transitions, so I'll suggest to them an option to disable the 
smoothing effect.

Jan

On 02/20/2012 03:30 PM, thomas bonfort wrote:
> PROCESSING "LABEL_NO_CLIP=yes"
>
> --
> thomas
>
> On Mon, Feb 20, 2012 at 15:27, Jan Hartmann<j.l.h.hartmann at uva.nl>  wrote:
>>
>> On 02/14/2012 06:17 PM, Stephen Woodbridge wrote:
>>
>> google: mapserver geomtransform
>>
>> this will let you fix the label point to the centroid of the object or some
>> other positions.
>>
>> The issue is that the label point is generally calculated based on the
>> geometry of the object as clipped to the view port. So the geometry changes
>> based on the view clipping and this causes the label point to also change.
>> the geomtransform works on the original data and so the label point becomes
>> fixed.
>>
>>
>> No I can't get this to work, perhaps I don't understand the syntax of
>> geomtransform. Can you give me an example of fixing a label to the center
>> point of a rectangle, without shifting it when the rectangle crosses the
>> viewport? My mapfile looks:
>>
>> connectiontype postgis
>> connection ""
>> data the_rect from bnds
>> labelitem rect_id
>> style
>>    color 0 0 0
>> end
>> label
>>    color 0 0 255
>> end
>>
>> I put a few geotransforms within the label and within the style objects, but
>> the label always shifts near the margin of the viewport.
>>
>> Thanks,
>>
>> Jan
>>
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>>
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