eulerr: Area-Proportional Euler and Venn Diagrams

Generate area-proportional Euler diagrams using numerical optimization. An Euler diagram is a generalization of a Venn diagram, relaxing the criterion that all interactions need to be represented. Diagrams may be fit with circles, ellipses, squares, and rectangles via a wide range of inputs and can be visualized in numerous ways. The fitting engine is described in Larsson and Lee (2026) doi:10.48550/arXiv.2611.02198 .

See also

Useful links:

• https://github.com/jolars/eulerr

• https://jolars.github.io/eulerr/

• https://eunoia.bz

• Report bugs at https://github.com/jolars/eulerr/issues

Author

Maintainer: Johan Larsson johan@jolars.co (ORCID) [copyright holder]

Authors:

• Johan Larsson johan@jolars.co (ORCID) [copyright holder]

Other contributors:

• A. Jonathan R. Godfrey [contributor]

• Peter Gustafsson [contributor]

• David H. Eberly (geometric algorithms) [contributor]

• Emanuel Huber (root solver code) [contributor]

• Florian Privé [contributor]