Information split that separates shield design from presentation

[Brian Sperlongano]

In order to promote re-usability of the great work we've done in generating highway shields on maps, we should separate design and presentation details into separate data products that can be used separately. The purpose of this ticket is to capture which details belong in which category and discuss the breakdown of attributes.

I propose as a starting point that there are three categories:

Shield design (kept in JSON):

• The shape of the shield (e.g., rectangle, oval, circle, diamond, etc.). This captures cases where the shield is some type of named shape. It is an enumeration that we will define. Rounded corners are defined in this category only if they are a significant design element vice a presentational detail.
• A pseudo-human-readable name of the shield design or artwork, in English, with some guidelines to be invented for the naming scheme
• The exact real-world color for:
  • Route number/designator text color
  • Shield background color
  • Shield border color
• A list of banner placards displayed above the shield with the exact text displayed in the real world
• The exact text written on the shield in cases where the text constitutes the equivalent of a ref for numbered routes.
• Special cases within the scope of the elements above (for example, "this particular route number is drawn in green")
• The list of OSM network values for which this shield design applies to
• Where appropriate, linkages to wikidata

Shield description (format TBD and may just be documentation):

• For each named shape, an English-language human-readable description of the shape
• For each shield artwork, an English-language human-readable description
• Where appropriate, linkages to wikidata

Shield presentation (kept in JSON):

• The color actually drawn on the digital map for the following categories. This may instead be represented as a discrete list of colors for which the closest color is selected by color distance.
  • Route number/designator text color
  • Shield background color
  • Shield border color
• All strategies for laying out text inside shields or for banners, including padding
• All strategies for expanding and contracting shapes to fit longer or shorter text
• Mappings between real-world banner placard text and the text string displayed on the digital map
• Line styles and thicknesses
• Fonts
• Whether or not corners are rounded and by how much
• The decision to draw a pseudo-route designator in place of a graphic design
• Special cases within the scope of the elements abo