This package renders diagrams produced by the FeynDrawGram web app. The input is the JSON exported by the “Save” button in the app.

Typical use:

#import "@preview/feyndrawgram:1.0.0": feyndrawgram

#feyndrawgram(json("my-diagram.json"))

Parameters:

• use-cetz-decorations (default: false) If false, photons/gluons are drawn by sampling exactly the same analytic path the web app shows on screen. If true, simple straight wavy/gluon edges with multiplicity 1 use CeTZ’ native decorations.wave / coil; curved or multi-line oscillating edges always fall back to sampling so that parallel waves stay in phase.
• unit (default: 1pt) Length of one canvas pixel in document units.