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44 lines
1.8 KiB
Markdown
44 lines
1.8 KiB
Markdown
# A/B Street + Mapbox demo
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This is an example of integrating parts of A/B Street with Mapbox GL. It's a
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normal web app using Mapbox, but it includes a layer rendering streets and
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moving agents from A/B Street.
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The goal is to increase interoperability and meet developers where they're at.
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Parts of the A/B Street code-base are intended as
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[a platform](https://a-b-street.github.io/docs/tech/map/platform.html) to build
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other transportation-related things, using unique features like the detailed
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street rendering. But Rust and our unusual UI library are a huge barrier.
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Treating A/B Street as a layer that can be added to Mapbox and as a library with
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a simple API for controlling a traffic simulation should be an easier start.
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Another goal is to take advantage of all the great stuff that exists in the web
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ecosystem. Instead of implementing satellite layers, multi-line text entry
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(seriously!), and story mapping ourselves, we can just use stuff that's built
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aready.
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## How to run
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You'll need `wasm-pack` and `python3` setup. You'll also need the `data/system/`
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directory to contain some maps.
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Quick development:
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`wasm-pack build --dev --target web -- --features wasm && ./serve_locally.py`
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To build the WASM in release mode:
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`wasm-pack build --release --target web -- --features wasm && ./serve_locally.py`
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Maps can be specified by URL:
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- http://localhost:8000/?map=/data/system/us/seattle/maps/arboretum.bin
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No deployment instructions yet.
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## How it works
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The `PiggybackDemo` struct is a thin layer written in Rust to hook up to the
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rest of the A/B Street codebase. After beng initialized with a WebGL context and
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a map file, it can render streets and agents and control a traffic simulation.
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It serves as a public API, exposed via WASM. Then a regular Mapbox GL app treats
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it as a library and adds a custom WebGL rendering layer that calls this API.
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