Look in this module for documentation on building your Directions API
query. In particular, look at the Request struct for examples of the
builder pattern. This module contains the tools (enums, structs, methods)
for building your Google Maps Platform request.
| avoid | Contains the Avoid enum and its associated traits. It is used to route
around features such as ferries, highways, and tolls.
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| departure_time | Contains the DepartureTime enum and its associated traits. It is used to
specify when the user would like to depart for traffic modelling and transit
directions.
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| location | Contains the Location enum and its associated traits. It is used to
specify origin and destination locations in the form of a text address,
latitude/longitude pair, or Google Place ID.
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| traffic_model | Contains the TrafficModel enum and its associated traits. It is used to
select a traffic model that is as accurate as possible, optimistic, or
pessimistic.
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| transit_mode | Contains the TransitMode enum and its associated traits. It is used to
prioritize certain transit modes such as bus or subway when generating
transit directions.
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| transit_route_preference | Contains the TransitRoutePreference enum and its associated traits. It is
used to prioritize fewer bus transfers or less walking is when
generating transit directions.
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| unit_system | Contains the UnitSystem enum and its associated traits. It is used specify
whether imperial or metric units are used in Directions responses.
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| waypoint | Contains the Waypoint enum and its associated traits. It is used to
specify intermediate locations in the form of a text address,
a latitude & longitude pair, a Google Place ID, or as an Encoded Polyline.
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| Request | Look at this Request struct for documentation on how to build your
Directions API query. The methods implemented for this struct are what's
used to build your request.
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