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< h1 > < a class = "header" href = "#live-edits" id = "live-edits" > Live edits< / a > < / h1 >
< p > A key feature of A/B Street is the player editing the map and seeing how traffic
responds. The possible edits include:< / p >
< ul >
< li > Change lane types (driving, bus, bike, parking -- sidewalks are fixed)< / li >
< li > Change speed limits< / li >
< li > Reverse a lane< / li >
< li > Change a stop sign policy (which roads have a stop sign and which have
priority)< / li >
< li > Change a traffic signal policy< / li >
< / ul >
< p > The map conversion process outlined above takes a few minutes, so reusing this
process directly to compute a map with edits wouldn't work at all for real
gameplay. Instead, the process for applying edits is incremental:< / p >
< ul >
< li > Figure out the actual diff between edits and the current map
< ul >
< li > This is necessary for correctness, but also speeds up a sequence of edits
made in the UI -- only one or two lanes or intersections actually changes
each time. Of course when loading some saved edits, lots of things might
change.< / li >
< / ul >
< / li >
< li > For any changed roads, make sure any bus stop on it have a good pointer to
their equivalent driving position for the bus.< / li >
< li > For any modified intersections, recompute turns and the default intersection
policies< / li >
< li > Recompute all the CHs for cars, buses, and bikes -- note sidewalks and bus
stops never change
< ul >
< li > This is the slowest step. Critically, the < code > fast_paths< / code > crate lets a previous
node ordering be reused. If just a few edge weights change, then recomputing
is much faster than starting from scratch.< / li >
< li > While making edits in the UI, we don't actually need to recompute the CH
after every little tweak. When the player exits edit mode, only then do we
recompute everything.< / li >
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< / li >
< / ul >
< p > A list of lanes and intersections actually modified is then returned to the
drawing layer, which uploads new geometry to the GPU accordingly.< / p >
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