No, simpler than that: tracks=1 => render a single line at all zooms tracks=2 => render a double line at all zooms tracks=X => render a multiple line with X tracks at all zooms tracks=1ofX => render a single line at high zooms, but render as if tracks=X at medium/low zooms
and though I wouldn't particularly recommend this complication (but there are circumstances you might want to use it): tracks=YofX => render as if tracks=Y at high zooms, and as if tracks=X at medium/low zooms As an example, if you've got four individual lines next to one another, they would all be tracks=1of4. Richard On Sun, Jun 21, 2009 at 3:00 PM, Jochen Topf <joc...@remote.org> wrote: > On Sun, Jun 21, 2009 at 07:24:37AM +0200, Cartinus wrote: > > On Saturday 20 June 2009 22:20:09 Jochen Topf wrote: > > > Can you think of any software or at least give an algorithm that would > make > > > use of this tag? > > > > When you use a different linestyle for rendering single and double track, > then > > (for the middle zoom levels) you can use the linestyle for double track > on > > any single track that has this extra tag. Aggregation then takes care of > > itself. > > So, do I understand this correctly: On small zoom levels you want to render > all > tracks with track=1ofX and all with track=YofX with Y!=1 don't get > rendered. It > is the responsibility of the mapper to decide which of several tracks gets > to > be number one, because this is the only one rendered (presumably a "middle" > one, if available). Of course you still have to render all tracks without > this > tag, because you don't know how they hang together. > > I guess this could work for rendering. There'll probably be some oddities > where different railways join, but for small enough zoom levels one can't > see that. Mappers would need some guidance on how to tag railway yards, > larger stations etc. so that it comes out right. > > Jochen > -- > Jochen Topf joc...@remote.org http://www.remote.org/jochen/ +49-721-388298 > > > _______________________________________________ > Talk-transit mailing list > Talk-transit@openstreetmap.org > http://lists.openstreetmap.org/listinfo/talk-transit >
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