<p align="center">
<a href="https://github.com/cmudig/draco2">
<picture>
<source media="(prefers-color-scheme: dark)" srcset="https://github.com/cmudig/draco2/raw/main/docs/logo-light.png">
<source media="(prefers-color-scheme: light)" srcset="https://github.com/cmudig/draco2/raw/main/docs/logo-dark.png">
<img alt="The Draco logo. A set of circles connected by lines depicting the draco star constellation." src="https://github.com/cmudig/draco2/raw/main/docs/logo-light.png" width=260>
</picture>
</a>
</p>
# Draco v2
[](https://github.com/codespaces/new?hide_repo_select=true&ref=main&repo=313704611&machine=standardLinux32gb&devcontainer_path=.devcontainer%2Fdevcontainer.json&location=WestEurope)
[](https://pypi.org/project/draco/)
[](https://www.npmjs.com/package/draco-pyodide)
[](https://github.com/cmudig/draco2/actions/workflows/test.yml)
[](https://github.com/psf/black)
[](https://codecov.io/gh/cmudig/draco2)
[](https://dig.cmu.edu/draco2)
[](https://mybinder.org/v2/gh/cmudig/draco2/HEAD)
[](https://dig.cmu.edu/draco2/jupyterlite)
[](https://dig.cmu.edu/draco2/jupyterlite/static/pyodide/console.html)
Draco is a formal framework for representing design knowledge about effective visualization design as a collection of
constraints. You can use Draco to find effective visualization designs or validate existing ones. Draco's constraints
are based on Answer Set Programming (ASP) and solved with the [Clingo](https://github.com/potassco/clingo) constraint
solver. We also implemented a way to learn weights for the recommendation system directly from the results of graphical
perception experiment. Draco v2 is a much improved version of the first iteration of
[Draco](https://github.com/uwdata/draco).
- [Draco paper (VIS 2018)](https://idl.cs.washington.edu/files/2019-Draco-InfoVis.pdf)
- [Draco 2 paper (VIS 2023)](https://arxiv.org/pdf/2308.14247.pdf)
## Documentation
Read about Draco in the online book at [https://dig.cmu.edu/draco2/](https://dig.cmu.edu/draco2/) or launch it in
interactive mode using [Binder](https://mybinder.org/v2/gh/cmudig/draco2/HEAD). In the documentation, we just refer to
_Draco_ without a version.
## Contributing
We welcome any input, feedback, bug reports, and contributions. You can learn about setting up your development
environment in [CONTRIBUTING.md](https://github.com/cmudig/draco2/blob/main/CONTRIBUTING.md).
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