How can I measure a table cell size to draw a vertical line as long as the cell height?

Questions
, ,
2

Hi. You can save position of each year and then draw lines between them:

#let get-margin(side) = {
  if page.margin == auto or page.margin.at(repr(side)) == auto {
    calc.min(page.height, page.width) * 2.5 / 21
  } else {
    page.margin.at(repr(side))
  }
}

#let timeline(year) = [#year#metadata(none)<timeline>]

#show table: it => context {
  let selector = here => selector(<timeline>).before(here)
  let init-marks = query(selector(here()))
  let before = here()
  it
  context {
    let marks = query(selector(here()))
    if init-marks.len() == marks.len() { return }
    let selector = std.selector(<timeline>).after(before).before(here())
    let marks = query(selector).map(x => x.location().position())
    let left-margin = get-margin(left)
    let top-margin = get-margin(top)
    let year-width = measure[2000].width
    for (a, b) in marks.windows(2) {
      place(
        top + left,
        dx: a.x - left-margin + year-width / 2,
        dy: a.y - top-margin,
        line(length: b.y - a.y - 0.6em, stroke: green + 1mm, angle: 90deg),
      )
    }
  }
}

#set text(size: 12pt)

#table(
  columns: (1fr, 10fr),
  stroke: none,
  timeline[2025], lorem(100),
  timeline[2024], lorem(50),
  timeline[2024], lorem(20),
)

#table(
  columns: (1fr, 10fr),
  stroke: none,
  timeline[1999], lorem(10),
  timeline[2010], lorem(10),
  timeline[2077], lorem(10),
)

image
image601×437 107 KB

The get-margin is used from How to right annotate a span of list items with a brace and text? - #2 by Andrew.