Hi, I've made a new preprocessor - area center calculator. It iterates though all ways, find good position to place an icon or text and save it to tags 'osmarender:areaCenterLat/Lon'.
Both osmarender and or/p will profit from it. Osmarender will be much faster and or/p use only bbox center for placing icons, which has bad results on some kinds of polygons. The areaCenter prepocessor use different strategy for (almost) convex polygons and for general polygons. Area center for (almost) convex polygon is simply it's centroid, area center for general polygon is calculated using bobcare's algorithm. Almost convex polygon means polygon which area is at least 80% of it's convex envelope. It's written in Java as osmosis plugin. I don't know how many people have Java available, anyway osmarender and orp can calculate area center by themself so people without Java can still use [EMAIL PROTECTED] You can see results for areaCenter preprocessor, osmarender area center algorithm and orp area center algorithm here: http://jttt.110mb.com/areacenter.svg http://jttt.110mb.com/osmarender.svg http://jttt.110mb.com/orp.svg Image for osmarender is smaller because osmarender was taking too long to render big image. It's not in svn yet, you can download osmosis with areacenter plugin included here: http://jttt.110mb.com/areacenter.zip Usage ./osmosis -p org.tah.areaCenter.AreaCenterPlugin --read-xml input.osm --area-center --write-xml output.osm Do you think I should make area center preprocessor default (and force people to install Java or disable it in their tilesAtHom.conf)? -- Jiri _______________________________________________ Tilesathome mailing list [email protected] http://lists.openstreetmap.org/listinfo/tilesathome
