Hi,
I'm looking into a request to have the label conflict
resolution algorithm consider other graphic elements
as obstacles for labeling, in particular point symbolizers,
but it could be something else as well.
As I understand this is something the ESRI products allow
for.
The current labeler already has the ability to store a
Rectangle2d as an obstacle and uDig is using to avoid
labels overlapping with some map decorations, so the
labeler itself would not have to be touched, it already
has the necessary area reservation abilities.
So I guess what I'd need to to mark certain symbolizers
as obstacles.
Looks like a good occasion to move TextSymbolizer.getOptions()
one level up in Symbolizer so that all symbolizers can have
vendor options.
I guess the sld could look like:
<PointSymboolizer>
<Graphic>
...
</Graphic>
<VendorOption name="labelObstacle">true</VendorOption>
</PointSymbolizer>
and the renderer would process that directive by marking
the rectangle2d used by the geometry as busy (this won't
work too well will lines, we'd need a bitmap based
conflict resolution to do that better).
Ah, I'd need to commit the work on 2.6.x as well, and the
above would be an API change. What about doing the API
change on trunk only and have the code work against the
implementations on 2.6.x
Otherwise I can setup a git clone just for this work
for the time being.
Opinions?
Cheers
Andrea
--
Andrea Aime
OpenGeo - http://opengeo.org
Expert service straight from the developers.
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