[OSM-dev] Label font scaling

[Lynn W. Deffenbaugh (Mr)]

Ok, that's a good step in the right direction.  But since I stated that 
I'm using mod_tile/renderd, how does one configure things to use that?

I see that mod_tile's renderd.py invokes mapnik.render(), but without 
the 3rd argument which is the scale factor.  Or is there a new version 
of mod_tile that I need to pick up?  Checking further reveals that 
gen_tile..cpp invokes agg_renderer, but again without that optional 3rd 
parameter of the scale factor.

I don't know which of these two modules is actually invoked by apache 
when tiles are requested, but since neither one does scale_factor, this 
looks like a mapnik feature that's not yet used by mod_tile/renderd?

Lynn (D) - KJ4ERJ - Author of APRSISCE for Windows Mobile and Win32

On 5/31/2013 12:47 PM, Dane Springmeyer wrote:
> 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 <mailto: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:
>>
>>> <https://help.openstreetmap.org/vote/8472/up/>
>>> 3
>>> <https://help.openstreetmap.org/vote/8472/down/>
>>> 	
>>>
>>> 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
>>
>> _______________________________________________
>> dev mailing list
>> dev at openstreetmap.org <mailto:dev at openstreetmap.org>
>> http://lists.openstreetmap.org/listinfo/dev
>

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