[OSM-talk] OpenStreetMap Carto design

[Christoph Hormann]

On Friday 29 June 2018, Paul Norman wrote:
>
> I had a go at fixing the roads code with
> https://github.com/gravitystorm/openstreetmap-carto/pull/2869, but
> didn't have free time. Based on that work, I'd estimate that the
> roads code is twice the size and complexity of what it needs to be.
>
> With the surface code merged, I would be unwilling to tackle a
> cleanup like that. I like the surface code as a technical demo, but
> find it's too much complexity for the style in a part of the style
> which is already difficult to understand.

But the surface rendering from Lucas is something you could fairly well 
re-integrate into a reworked road rendering framework afterwards - and 
this is probably also the way i would approach it.

By the way roads rendering would be a really good test case for 
designing a rendering framework that would allow addressing the 
fundamental needs of rendering (in particular getting everything drawn 
in the right order and combining polygon and line features) with little 
complexity and at the same time allow flexibility in design (with 
casings, patterned fills, additional center lines etc.)

I have the impression that giving up the idea of fixed layers and 
database queries being directly attached to them in favour of a free 
modularization of how the data is queried and defining how it is drawn 
in what order independent of that could make this significantly easier 
and more intuitive.

How to implement something like that in an actual renderer is of course 
not a trivial task.

-- 
Christoph Hormann
http://www.imagico.de/