[OSM-dev] Label font scaling

[Dane Springmeyer]

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) <ldeffenb at homeside.to> 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 at 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
> 
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