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< ol class = "chapter" > < li class = "chapter-item expanded " > < a href = "../index.html" > < strong aria-hidden = "true" > 1.< / strong > Overview< / a > < / li > < li class = "chapter-item expanded " > < a href = "../howto/index.html" > < strong aria-hidden = "true" > 2.< / strong > Instructions< / a > < / li > < li > < ol class = "section" > < li class = "chapter-item expanded " > < a href = "../howto/map_parking.html" > < strong aria-hidden = "true" > 2.1.< / strong > How to map on-street parking< / a > < / li > < li class = "chapter-item expanded " > < a href = "../howto/new_city.html" > < strong aria-hidden = "true" > 2.2.< / strong > Importing a new city< / a > < / li > < / ol > < / li > < li class = "chapter-item expanded " > < a href = "../how_it_works.html" > < strong aria-hidden = "true" > 3.< / strong > How it works< / a > < / li > < li class = "chapter-item expanded " > < a href = "../case_studies/index.html" > < strong aria-hidden = "true" > 4.< / strong > Case studies< / a > < / li > < li > < ol class = "section" > < li class = "chapter-item expanded " > < a href = "../case_studies/lake_wash.html" > < strong aria-hidden = "true" > 4.1.< / strong > Lake Washington Blvd Stay Healthy Street< / a > < / li > < li class = "chapter-item expanded " > < a href = "../case_studies/west_seattle.html" > < strong aria-hidden = "true" > 4.2.< / strong > West Seattle mitigations< / a > < / li > < li class = "spacer" > < / li > < / ol > < / li > < li class = "chapter-item expanded " > < a href = "../dev/index.html" > < strong aria-hidden = "true" > 5.< / strong > Developer guide< / a > < / li > < li > < ol class = "section" > < li class = "chapter-item expanded " > < a href = "../dev/misc_tricks.html" > < strong aria-hidden = "true" > 5.1.< / strong > Misc developer tricks< / a > < / li > < li class = "chapter-item expanded " > < a href = "../dev/api.html" class = "active" > < strong aria-hidden = "true" > 5.2.< / strong > API< / a > < / li > < / ol > < / li > < li class = "chapter-item expanded " > < a href = "../map/index.html" > < strong aria-hidden = "true" > 6.< / strong > Map model< / a > < / li > < li > < ol class = "section" > < li class = "chapter-item expanded " > < a href = "../map/importing/index.html" > < strong aria-hidden = "true" > 6.1.< / strong > Importing< / a > < / li > < li > < ol class = "section" > < li class = "chapter-item expanded " > < a href = "../map/importing/convert_osm.html" > < strong aria-hidden = "true" > 6.1.1.< / strong > convert_osm< / a > < / li > < li class = "chapter-item expanded " > < a href = "../map/importing/geometry.html" > < strong aria-hidden = "true" > 6.1.2.< / strong > Road/intersection geometry< / a > < / li > < li class = "chapter-item expanded " > < a href = "../map/importing/rest.html" > < strong aria-hidden = "true" > 6.1.3.< / strong > The rest< / a > < / li > < / ol > < / li > < li class = "chapter-item expanded " > < a href = "../map/edits.html" > < strong aria-hidden = "true" > 6.2.< / strong > Live edits< / a > < / li > < li class = "chapter-item expanded " > < a href = "../map/misc.html" > < strong aria-hidden = "true" > 6.3.< / strong > Misc< / a > < / li > < / ol > < / li > < li class = "chapter-item expanded " > < a href = "../trafficsim/index.html" > < strong aria-hidden = "true" > 7.< / strong > Traffic simulation< / a > < / li > < li > < ol class = "section" > < li class = "chapter-item expanded " > < a href = "../trafficsim/discrete_event.html" > < strong aria-hidden = "true" > 7.1.< / strong > Discrete event simulation< / a > < / li > < li class = "chapter-item expanded " > < a href = "../trafficsim/travel_demand.html" > < strong aria-hidden = "true" > 7.2.< / strong > Travel demand< / a > < / li > < li class = "chapter-item expanded " > < a href = "../trafficsim/gridlock.html" > < strong aria-hidden = "true" > 7.3.< / strong > Gridlock< / a > < / li > < li class = "chapter-item expanded " > < a href = "../trafficsim/trips.html" > < strong aria-hidden = "true" > 7.4.< / strong > Multi-modal trips< / a > < / li > < li class = "chapter-item expanded " > < a href = "../trafficsim/live_edits.html" > < strong aria-hidden = "true" > 7.5.< / strong > Live edits< / a > < / li > < li class = "spacer" > < / li > < / ol > < / li > < li class = "chapter-item expanded " > < a href = "../project/index.html" > < strong aria-hidden = "true" > 8.< / strong > Project< / a > < / li > < li > < ol class = "section" > < li class = "chapter-item expanded " > < a href = "../project/roadmap.html" > < strong aria-hidden = "true" > 8.1.< / strong > Roadmap< / a > < / li > < li class = "chapter-item expanded " > < a href = "../project/motivations.html" > < strong aria-hidden = "true" > 8.2.< / strong > Motivations< / a > < / li > < li class = "chapter-item expanded " > < a href = "../project/history/index.html" > < strong aria-hidden = "true" > 8.3.< / strong > History< / a > < / li > < li > < ol class = "se
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< h1 > < a class = "header" href = "#api" id = "api" > API< / a > < / h1 >
< p > Suppose you're tired of manually fiddling with traffic signals, and you want to
use machine learning to do it. You can run A/B Street without graphics and
automatically control it through an API.< / p >
< h2 > < a class = "header" href = "#example" id = "example" > Example< / a > < / h2 >
< p > This
< a href = "https://github.com/dabreegster/abstreet/blob/master/headless/examples/python_client.py" > Python example< / a >
has everything you need to get started.< / p >
< h2 > < a class = "header" href = "#api-details" id = "api-details" > API details< / a > < / h2 >
< blockquote >
< p > < strong > Under construction< / strong > : The API will keep changing. There are no backwards
compatibility guarantees yet. Please make sure I know about your project, so I
don't break your client code.< / p >
< / blockquote >
< p > For now, the API is JSON over HTTP. The exact format is unspecified, error codes
are missing, etc. A summary of the commands available so far:< / p >
< ul >
< li > < strong > /sim< / strong >
< ul >
< li > < strong > GET /sim/reset< / strong > : Reset all map edits and the simulation state. The trips
that will run don't change; they're determined by the scenario file you
initially pass to < code > headless< / code > .< / li >
< li > < strong > GET /sim/get-time< / strong > : Returns the current simulation time.< / li >
< li > < strong > GET /sim/goto-time?t=06:30:00< / strong > : Simulate until 6:30 AM. If the time you
specify is before the current time, you have to call < strong > /sim/reset< / strong > first.< / li >
< / ul >
< / li >
< li > < strong > /traffic-signals< / strong >
< ul >
< li > < strong > GET /traffic-signals/get?id=42< / strong > : Returns the traffic signal of
intersection #42 in JSON.< / li >
< li > < strong > POST /traffic-signals/set< / strong > : The POST body must be a traffic signal in
JSON format.< / li >
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< li > < strong > GET /traffic-signals/get-delays?id=42& t1=03:00:00& t2=03:30:00< / strong > : Returns
the delay experienced by every agent passing through intersection #42 from
3am to 3:30, grouped by direction of travel.< / li >
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< li > < strong > GET /traffic-signals/get-cumulative-thruput?id=42< / strong > : Returns the number of
agents passing through intersection #42 since midnight, grouped by direction
of travel.< / li >
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< / ul >
< / li >
< li > < strong > /data< / strong >
< ul >
< li > < strong > GET /data/get-finished-trips< / strong > : Returns a JSON list of all finished trips.
Each tuple is (time the trip finished in seconds after midnight, trip ID,
mode, duration of trip in seconds). The mode is either a string like " Walk"
or " Drive" , or null if the trip was aborted (due to a simulation bug or
disconnected map).< / li >
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< li > < strong > GET /data/get-agent-positions< / strong > : Returns a JSON list of all active agents.
Vehicle type (or pedestrian), person ID, and position is included.< / li >
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< / ul >
< / li >
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< li > < strong > /map< / strong >
< ul >
< li > < strong > GET /map/get-edits< / strong > : Returns the current map edits in JSON. You can save
this to a file in < code > data/player/edits/map_name/< / code > and later use it in-game
normally. You can also later run the < code > headless< / code > server with
< code > --edits=name_of_edits< / code > .< / li >
< / ul >
< / li >
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< / ul >
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< h2 > < a class = "header" href = "#related-tools" id = "related-tools" > Related tools< / a > < / h2 >
< p > There's no API to create trips. Instead, you can
< a href = "https://dabreegster.github.io/abstreet/trafficsim/travel_demand.html#custom-import" > import trips from your own data< / a > .< / p >
< p > If you need to deeply inspect the map, you can dump it to JSON:< / p >
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< pre > < code > cargo run --bin dump_map data/system/maps/montlake.bin
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< / code > < / pre >
< p > The format of the map isn't well-documented yet. See the
< a href = "https://dabreegster.github.io/abstreet/rustdoc/map_model/index.html" > generated API docs< / a >
and < a href = "https://dabreegster.github.io/abstreet/map/index.html" > the map model docs< / a >
in the meantime.< / p >
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