Commits on Oct 14, 2016

1. [ios, macos] Add feature initializer …

   This adds a features initializer to MGLGeoJSONSource. The initializer
   takes shapes and converts them to JSON representation before passing
   to core. This also adds methods to the MGLShape concrete subclasses
   so that they can represent themselves in NSDictionary form suitable
   for transforming to JSON (GeoJSON).

   

   ituaijagbone authored and boundsj committed Oct 14, 2016
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2. [ios, macos] Teach features and shapes about GeoJSON and mbgl types …

   MGLShape subclasses can now return NSDictionaries that represent the shapes' GeoJSON geometries. MGLFeature classes can now return NSDictionaries that represent the features as GeoJSON features. This makes it trivial to serialize iOS and macOS shapes and features into GeoJSON.
   
   MGLFeature instances can also return a representation of themselves as an mbgl::Feature. This capability is used in a refactoring of the implementations of MGLGeoJSONSource to more efficiently transform MGLFeatures into mbgl::Features so they can be fed directly into mbgl::GeoJSONSource without having to round trip through NSJSONSerialization. The MGLFeature identifier is converted into the mbgl::identifier type based on the type of the identifier. The MGLFeature attributes are recursively converted into an mbgl::PropertyMap and each value is converted into one of the types that the PropertyMap's Value variant supports.

   

   boundsj committed Oct 14, 2016
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