[ka-Map-dev] [Bug 1379] labels truncated at tile boundaries

bugzilla-daemon at bugzilla.maptools.org bugzilla-daemon at bugzilla.maptools.org
Wed May 10 11:08:41 EDT 2006


------- Additional Comments From dmorissette at mapgears.com  2006-05-10 11:08 -------
Tamas, you wrote "mapserver should draw the labels if the partial drawing is
enabled and the labels bounding box falls inside the drawing area", but
unfortunately achieving this is not as simple as it seems.

In order to catch all the partial labels, you need to process the shapes that
they come from, and in order to do that you need to enlarge the bbox of the data
that you read from the shapefiles by some buffer value around the current map
extents, that's more or less what increasing the metaBuffer value does today.
But then what is the correct buffer value? If you don't make the buffer large
enough then you risk losing some very large partial labels, and if you make the
buffer too large then you can affect rendering performance significantly.

Plus, with automated label positioning, the position of the labels is not
absolute, it can change depending on which labels were drawn before a given
label. As a result, a partial label may not show up at the same location in two
metatiles evn if you use a large buffer.

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