let cell_size = 10
let slash_length = mult(cell_size, sqrt(2))
let cols = 20
let rows = 4


penwidth!(3)

fn forward_slash! () -> {
  pd!()
  rt!(0.125)
  fd!(slash_length)
  pu!()
  bk!(slash_length)
  lt!(0.125)
}

fn back_slash! () -> {
  pu!()
  fd!(cell_size)
  pd!()
  rt!(0.375)
  fd!(slash_length)
  pu!()
  lt!(0.125)
  bk!(cell_size)
  lt!(0.25)
}

fn next_cell! () -> {
  pu!()
  rt!(0.25)
  fd!(cell_size)
  lt!(0.25)
}

repeat rows {
  repeat cols {
    if random([true, false])
      then forward_slash!()
      else back_slash!()

    next_cell!()
  }
  lt!(0.25)
  fd!(mult(cols, cell_size))
  rt!(0.25)
  back!(cell_size)
}