2009/3/15 Stefan de Konink <[email protected]>: > Udo Giacomozzi wrote: >> Of course I realize that now the OSM data format can't be extended to >> curves without breaking existing renderes and tools... > > You can extend it to NURBS without breaking tools ;) Think about the > control point approximation ;) So every embedded device that isn't fast > or doesn't have a fpu will use the ugly linear version, while any other > tool will use the weight associated with the line thus has a pretty > version of it all. > > > Stefan
I'm quite familiar with the use of NURBS ecc. but want to point you to another fact: curves in streets are not designed completely "free" but follow in nearly all cases some basic rules, that is: they are all tractrix. http://en.wikipedia.org/wiki/Tractrix So when thinking about implementing curves, think first of implementing this type of curve that is used to design streets. Martin _______________________________________________ dev mailing list [email protected] http://lists.openstreetmap.org/listinfo/dev
