A gingham loom that runs entirely in your browser. Set the cloth size in pixels at a given resolution, pick the yarns, choose how fine the check is, and cut the result as SVG, PNG, JPEG, WEBP, AVIF, a seamless tile, or a CSS rule.

No render server, no uploads. main.ts serves static files; everything else happens on the client.

A woven cloth is warp threads (columns) crossed by weft threads (rows). Each axis is a repeating sequence of bands, and each band is dyed with one of three yarns. The color at a crossing is a mix of its warp yarn and its weft yarn — which is why classic gingham reads as three tones from only two colors.

Everything downstream draws from one tile, so the preview, the SVG and the PNG are the same geometry. Band edges are snapped to whole pixels with cumulative rounding, which keeps the tile seamless and the exports crisp.

Transparency is carried through in premultiplied space, so a transparent secondary yarn gives you a check that stays semi-transparent where it should and fully opaque where the colored threads cross — ready to layer over other art.

File	Role
main.ts	Hono app; serves frontend/
frontend/gingham.js	The loom: bands, weave structures, color mixing, measuring
frontend/render.js	Canvas painting, SVG output, raster encoding, CSS output
frontend/presets.js	Defaults, the sample book, the random-bolt generator, URL codec
frontend/app.js	State, controls, rulers, export
frontend/style.css	Everything visual

• Gingham — the classic even check
• Windowpane — thin lines, wide panes
• Tattersall — two colors of fine line
• Triple check — three-tone grid
• Madras — irregular seeded bands
• Bengal stripe — warp only, no cross-check

Any of them can be woven flat (solid blocks, smallest files) or with a real plain, twill or basket interlacing, where individual threads pass over and under each other.

The whole pattern is encoded into the URL fragment, so a link reproduces the exact cloth without a database.