A library for diagonal line dividers in Typst tables; a.k.a., table cells with a diagonal line dividing them.

Move the diagbox.typ file to e.g. the same folder your main .typ file is in, then write #import "diagbox.typ": * inside it.

This will import two functions: bdiagbox[left][right] (for a diagonal from top-left to bottom-right) and tdiagbox[left][right] (for a diagonal line from bottom-left to top-right).

See sample usage in the examples folder.

Using a simple box with a diagonal line across it won't work in most cases, as tables come with an internal padding option called inset; thus, no box would be able to occupy an entire cell (there would always be some negative space around it).

Instead, the bdiagbox and tdiagbox functions take an inset parameter (which defaults to 5pt, the default for all tables, but must be overridden if your table has a different value). With that parameter, the diagonal line will exceed the box's boundaries to compensate for the padding.

So, for example, if we consider a coordinate system with (0, 0) as the inner box's top left corner, with x increasing to the right and y increasing downwards, we would have, for bdiagbox (a diagonal line going from top left to bottom right), a line going from (-inset, -inset) to (inner_width + inset, inner_width + inset), where inner_width is calculated (normally) by width - 2*inset (where width is the column's total width, which the diagbox should fully occupy).

This is why, if you place a diagbox outside of a table without specifying inset: 0pt, with box_stroke: 1pt, you will notice that the line "overflows" the box - this is necessary to compensate for internal table padding.