observablehq / observablehq/plot

Description

We can create a grid facet with:

    x: d => (f(d) % 5),
    y: d => Math.floor(f(d) / 5)

where f returns an integer, maybe d => groups.indexOf(d.group).

Can we make it easier to compute the gridded facet, and to draw its mark)? (In this case we can't use fx/fy for the facet ticks, and also need a way to draw the facet's tick inside or below the frame at a fixed point.)

Examples:

https://observablehq.com/d/61ca1967e419b882

https://observablehq.com/@data-workflows/geofacet & https://github.com/observablehq/plot/pull/101

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