On 2/14/2012 12:03 PM, Jan Hartmann wrote:
Hi,
The development version of Openlayers has a new facility: smooth tile
transition. When panning, the old image remains visible for 2.5 seconds
under the new one, so as to make the panning process smoother. This
works fine for static maps, but gives undesired effects with MapServer
labels. Those are computed anew for every request, so e.g. labels for
items at the corner of the map get a different position, to keep them
inside the displayed map. This results in old and new labels being
displayed next to one another for some time.
Is there an option in MapServer to constrain the labels to always have
the same position respective to the geometry they are labeling?
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.
There is also a lot of label enhancements being added to trunk for the
next release. You might want to look at rfc 77 [1] in additions to rfc
72 [2].
[1] http://mapserver.org/development/rfc/ms-rfc-77.html
[2] http://mapserver.org/development/rfc/ms-rfc-72.html
-Steve W
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