[Tilesathome] New preprocessor - area center

[Jiri Klement]

>> Do you think I should make area center preprocessor default (and force
>> people to install Java or disable it in their tilesAtHom.conf)?
>
> I'll have a look, maybe I can simply re-implement your code in Perl, then we
> don't have the Java dependency. It shouldn't be too hard!

Actually I've been thinking about another thing, that would make Java
dependency mandatory. One of steps in batik's svg rendering is
creating of GVT tree. It contains all graphic elements already with
all styles applied. You can get bounding box for every element
(including it's stroke-width, font-size etc).

Using GVT tree should be possible to make list of nodes/ways that
affect neighbouring tile, but have no node in neighbouring tile. So it
would be possible to download only tile + nodes/ways that are known to
affect the tile. Not like it works now when you download and process
2.68 times more data than neccessary. This will also allow to
processes smaller tiles than z12.

I think it would be worthy to make Java new dependency if this works
out. So reimplementing area center preprocessor in perl might not be
necessary. For now I will make area center preprocessor to fail
silently when Java is not installed. orp/osmarender can still
calculate area center by themselves though not as good as area center
preprocessor can.

--
Jiri