How to do scale-aware vector operations

[JonPichel]

Hi,

I have defined this function to draw nodes in a diagram:

/// Draw a block on the canvas.
///
/// - pos (coordinate): Center coordinate of the block.
/// - width (int): Width of the block.
/// - height (int): Height of the block.
/// - name (none, str): Reference name for the block.
/// - label (content): Text to display inside the block.
/// ->
#let node(pos, width, height, label, name: none) = {
  import cetz.draw: *

  let box-options = (
    stroke: 2pt,
    width: 100%,
    height: 100%,
    radius: 2pt,
  )

  get-ctx(ctx => {
    let (_, pos) = cetz.coordinate.resolve(ctx, pos)
    let start = cetz.vector.add(pos, (-width / 2, -height / 2))
    let end = cetz.vector.add(start, (width, height))

    content(
      start,
      end,
      box(
        ..box-options,
        align(center + horizon, label),
      ),
      name: name,
    )
  })
}

It works fine, but then when I try to scale diagrams that make use of this function using cetz.draw.scale, I find that the size of the nodes created with this function do not change. I know it is because of the way I compute the start and end positions using cetz.vector.add. Is there a way to add these vectors using the context's transform or something?

Thanks