Mapnik supports an optional `scale_factor` argument for rendering that enables the 2x scale up (or any variable size) without any modifications to your stylesheet.
See documentation at https://github.com/mapnik/mapnik/wiki/Scale-factor Dane On May 31, 2013, at 8:12 AM, Lynn W. Deffenbaugh (Mr) <[email protected]> wrote: > I'm running my own Tile Server (mod_tile/renderd created from packages as > described at > http://switch2osm.org/serving-tiles/building-a-tile-server-from-packages/ and > would like to serve up a new set of tiles with larger font sizes for higher > resolution displays. > > I read > https://help.openstreetmap.org/questions/8467/font-size-and-adding-scale-to-map > which describes the textsymbolizer element in osm.xml, to whit: > >> >> 3 >> The font size comes from the style file osm.xml. This includes several lines >> on the form "<textsymbolizer name="name" fontset_name="bold-fonts" >> size="11"/>". You can edit the size parameter in the wanted areas to >> generate a new style with other font sizes. >> > > But there's a TON of textsymbolizer's that would need to be edited. > Cloudmade's tile servers support an embedded doubler in their tile URL as > described at http://developers.cloudmade.com/projects/tiles/documents > >> To get double resolution tiles use @2x suffix: 997@2x - this will improve >> map look for iPhone 4, Motorola Milestone, etc. > > Does anyone know how they do that? Is there a way to replace the > textsymbolizer element size attributes with a variable (say Size11, Size8, > SizeN) so that I can simply clone the style and edit all of the sizes in a > single place? Then I could do a 1.5, 2, 4, or whatever by simply editing the > sizes where the variables are declared instead of every single textsymbolizer > element. > > Any/all help would be appreciated to accomplish label font scaling in the > rendering chain with minimal manual editing work for each scale that I > support. > > Lynn (D) - KJ4ERJ - Author of APRSISCE for Windows Mobile and Win32 > > _______________________________________________ > dev mailing list > [email protected] > http://lists.openstreetmap.org/listinfo/dev
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