Hi Kai,
A picture is maybe easier to understand:
http://opensnowmap.org/?zoom=14&lat=46.54631&lon=6.12847&layers=&marker=false&marker=true
The red pistes are relations rendered with an offset to depict the ways
they have in common with the orange one.
See how the offset affects http://www.openstreetmap.org/relation/1446600
at the start and end: one wayleft, one way right.
As to know if it's a general demand, hard to say. This is just one of
multiple corner cases that makes using offsets complicated in Mapnik.
Thanks for the pointer, I'll try to see if I can do something in
pgsql_out_relation().
Yves
On 01/28/2014 07:14 PM, Kai Krueger wrote:
Hi,
I am not sure I fully understand what you are trying to do, but the part
of the code that seems most likely what you are looking for is the
function pgsql_out_relation (
https://github.com/openstreetmap/osm2pgsql/blob/master/output-pgsql.c#L693
). First I thought you might be able to use the lua tagtransform to do
this, but it doesn't actually pass the osm_ids (or geometry) into the
lua script.
If this is a general thing people want and need to do, perhaps one could
expand the lua interface to pass the necessary information in to do
these kind of processing steps too?
Kai
On 01/27/2014 02:16 PM, yvecai wrote:
I'm looking for the code in OSm2pgsql responsible for 'route' relations
pre-processing.
When a relation make a loop on itself (the same way appears twice in the
relation, backward, then later forward) osm2pgsql does the same: the
resulting linestring is complete. Certainly great for routing, this has
some un-desired effects (at least for me) for rendering.
For instance if using 'offset' parameter in mapnik, the forward part
will be offset left, and the backward right, which I'd like to avoid in
some cases.
Could somebody points me to the relevant part of the code where I could
check for duplicate way IDs passed to geos Linemerger ?
Yves, not so good in reading C
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