two-storey.arch

# A compact two-storey house — one drawing per storey, from `level` blocks.
#
# Settings and the plan-global `let`s live OUTSIDE the levels and apply to every one of
# them: one building is issued on one sheet at one scale. Each level's body is an ordinary
# plan body, and ids are unique WITHIN a level — so the `stair` below exists on both floors
# at the same coordinates, and that shared id is what declares one shaft: `describe --json`
# reports it under `vertical.connections`, and it is why the first floor needs no front
# door of its own to lint clean.
plan "Two-storey house" {
  units mm
  grid 50
  paper A3 landscape
  north up
  dims auto all

  let W = 8000        # outer width (wall centerlines)
  let D = 7000        # outer depth
  let T = 200         # exterior wall thickness
  let HALL = 2200     # the stair hall / landing runs the full depth on the left

  level 1 "Ground floor" {
    wall id=shell exterior thickness T { (0,0) (W,0) (W,D) (0,D) close }
    wall id=hall_w partition thickness 100 { (HALL,0) (HALL,D) }
    wall id=kitchen_w partition thickness 100 { (HALL,3600) (W,3600) }

    room id=hall at (0,0) size 2200x7000 label "Hall" uses hall
    room id=living at (2200,0) size 5800x3600 label "Living" uses living
    room id=kitchen at (2200,3600) size 5800x3400 label "Kitchen" uses kitchen

    door id=front on shell at 21900 width 1000 swing into hall
    door id=d_living on hall_w at 1800 width 900 swing into living
    door id=d_kitchen on hall_w at 5300 width 900 swing into kitchen

    window id=w_living on shell at 5000 width 1800
    window id=w_kitchen on shell at 13300 width 1200

    furniture sofa in living anchor top flush inset 300 size 2000x850 label "Sofa"
    furniture kitchen_sink against wall kitchen_w offset 1200 in kitchen
    stair id=stair at (100,1500) size 900x2600 dir up
  }

  level 2 "First floor" {
    wall id=shell exterior thickness T { (0,0) (W,0) (W,D) (0,D) close }
    wall id=hall_w partition thickness 100 { (HALL,0) (HALL,D) }
    wall id=bath_w partition thickness 100 { (0,4600) (HALL,4600) }
    wall id=bed_w partition thickness 100 { (HALL,3600) (W,3600) }

    room id=landing at (0,0) size 2200x4600 label "Landing" uses circulation
    room id=bath at (0,4600) size 2200x2400 label "Bath" uses bath
    room id=bed1 at (2200,0) size 5800x3600 label "Bedroom 1" uses bedroom
    room id=bed2 at (2200,3600) size 5800x3400 label "Bedroom 2" uses bedroom

    # No exterior door up here: the `stair` below carries the same id as the ground
    # floor's, so the access graph reads the landing as reached from outside via the
    # storey below. (Before vertical circulation was modelled this floor needed a
    # made-up balcony door to lint clean.)
    door id=d_bed1 on hall_w at 1800 width 900 swing into bed1
    door id=d_bed2 on hall_w at 4100 width 900 swing into bed2
    door id=d_bath on bath_w at 1100 width 800 swing into bath

    window id=w_bed1 on shell at 5000 width 1500
    window id=w_bed2 on shell at 13300 width 1200
    window id=w_bath on shell at 24200 width 600

    furniture bed in bed1 anchor top-right flush inset 300 size 1500x2000 label "Double"
    furniture bed in bed2 anchor bottom flush inset 300 size 1000x2000 label "Single"
    furniture wc in bath anchor bottom-left flush size 400x700
    furniture basin in bath anchor bottom-right flush size 600x450
    stair id=stair at (100,1500) size 900x2600 dir down

    # The landing looks down into the hall below over a balustrade: there is no floor
    # here, so the plan says so. A `void` is drawn (dashed rectangle + both diagonals)
    # and it OBSTRUCTS circulation — you cannot walk across a hole — with the walkable
    # halo suppressed on every edge, because you can stand at the railing. It does NOT
    # come off the landing's area: that number is the room's floor area and it is what
    # the schedule and `describe --json` both report, so subtracting the well here would
    # leave the drawing and the table disagreeing. `describe --json` lists it under
    # `voids[]` with the room it falls in, which is where a net figure comes from.
    void id=gallery at (100,200) size 900x1100

    # The eaves, on the top storey only — this level's `shell` is the plan's one
    # closed exterior ring on THIS page, so no `wall` clause is needed.
    roof overhang 400
  }

  title {
    project "Two-storey house"
    drawn_by "ArchLang"
    date "2026-07-26"
  }
}