On Wed, Aug 15, 2012 at 11:29 AM, Rahkonen Jukka
<[email protected]>wrote:
> Hi,****
>
> ** **
>
> > What you are experiencing is that for polygons, the anchor****
>
> > point used for labelling is the centroid of the visible portion****
>
> > of the polygon. So for each small tile image that covers your****
>
> > polygon, a new anchor point is computed and the label is drawn.****
>
> ** **
>
> There must be something obvious that I cannot see, but why not****
>
> to have an option to use the real centroid of the polygon as anchor ****
>
> point instead of the centroid of the visible portion when the goal****
>
> is to create tiles?
>
There is not reason not to have it indeed, it's just works that needs
doing, and code
does not write itself :-p
It's also not easy because by the time the polygon gets to the labelling
enging the
polygon is clipped to the viewing area already, an option could be to have
a
filter function called "label point" that can be used when specifying the
geometry:
<TextSymbolizer>
<Geometry>
<ogc:Function name="labelPoint">
<ogc:Property>the_geom</ogc:Property>
</ogc:Function>
</Geometry>
...
</TextSymbolizer>
There is this common fallacy that the centroid is a good label point, while
try in
most simple cases there is no guarantee it actually falls inside the polygon
(think of a doughnut), a label point instead should always be inside or at
worse
on the border (which is something the labeler in its default configuration
guarantees instead)
Cheers
Andrea
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