expose more style properties for annotations

[incanus]

Shape annotations need to support more features in the exposed API.

Definite:

• line join
• line cap
• line dash

Maybe:

• line/fill image
• translate (for putting lines next to roads? e.g. multiple transit line colors)
• antialias off?

@friedbunny

[friedbunny]

"Line/fill image" could also be useful for specifying symbols, like arrows. CartoCSS supported this via marker-type: arrow.

Line stroke would also be nice to have.

[jfirebaugh]

Can we expose exactly the set of properties that are in the style spec?

[incanus]

Can we expose exactly the set of properties that are in the style spec?

In C++, sure. We shouldn't do this all the way up in iOS because it would just crap up the delegate protocol, since that's where we configure these things (on a per-annotation basis).

[incanus]

Line stroke would also be nice to have.

BTW, this is in there for polylines already. For polygons, see #1737 for why we can't do this right now.

[friedbunny]

@incanus I suppose I mean "stroke" in the Photoshop sense — an external casing around the filled line. Right now this requires duplicating the line and widening it, unless I'm missing something.

[incanus]

De-prioritizing this in light of #1839, which solves the immediate problem at hand.