Sailing

Sailing is wind, bearings and canvas on top of an open vehicle. It is the use sailing extension, and it builds on use expanses: both lines go in the story header, and neither turns on the other. Every word on this page applies to a movement: open vehicle in an expanse; on any other vehicle, or a room carrying wind:, it is a compile error.

story
  title: The Sargasso
  authors:
    ref
  id: sargasso
  story-version: 0.0.1
  use expanses
  use sailing

Bearings

Under use sailing a heading is a bearing in whole degrees, 0 north, clockwise. A compass word still names its bearing (northeast is 45), so the base compass set, start <vehicle> heading <direction> and is heading <direction> keep working, and each also takes <n> degrees.

The naval command set turns the ship from where it points: port 15 and starboard 15 degrees (the word is optional), hard to port and hard to starboard for 90 degrees, come about to tack through the wind. No turn starts the ship: ahead puts it under way on its bearing and heave to takes it out. A bare port asks how far, so no turn size is ever invented for the author. A ship may list both sets, answering "starboard 15" and "steer north" alike.

Wind

Wind is the author's choice. With no wind: line the vehicle writes the base pace: and the wind is never read. With one, the expanse carries it — wind: from <direction or bearing> or wind: calm — the story changes it with set the <expanse>'s wind to <direction, bearing or calm>, and the vehicle writes a sailing block in place of pace:.

The sailing block gives the pace by the angle between the heading and where the wind comes from: 0 is dead into it, 180 dead before it. Each row is a band, <a> to <b> degrees: <n> turns or stopped, plus one calm: row. After every step the band the ship is in sets the pace of the next, so a tailwind is faster and a headwind slower at exactly the paces written. In a stopped band the ship keeps her heading and stays under way but does not move: she is in irons, said once, and <vehicle> is in irons holds until she is turned out of it.

Sails

Sails are optional, author-named settings on the vehicle, declared from least to most canvas with a start: sails: furled, reefed, full and sails start: furled. With sails, each band row gives a pace per setting, naming every setting once; the calm: row keeps one value. The naval set gains make sail, shorten sail and furl sails, understood only aboard a vehicle with sails:; the story writes set the <vehicle>'s sails to <setting> and reads <vehicle>'s sails are <setting>. Irons is the wind's, not the canvas's: it applies when the band is stopped under the fullest setting.

create the Sargasso
  an expanse
  size: 40 by 40
  wind: from northeast
  aka sea, weed

  Weed-choked water under a sky the colour of pewter.

  landmarks
    Port Royal: 3, 4
    the Reef: 12, 30
  end landmarks

create Port Royal
  a room
  seen from afar: a smudge of smoke over a low green shore

  The quay at Port Royal, the Marigold warped alongside.

create the Reef
  a room
  seen from afar: a line of white where the swell breaks

  Coral under a foot of water, and the wreck it made.

create the Marigold
  a vehicle
  in the Sargasso at 20, 20
  movement: open
  carries: in
  drive: player
  commands: naval, compass
  stride: 1 unit
  sight: 8
  seen from afar: three masts leaning to the wind
  sails: furled, reefed, full
  sails start: furled
  aka ship, barque

  A barque, three masts, a wheel aft.

  sailing
    0 to 44 degrees: furled stopped, reefed stopped, full stopped
    45 to 74 degrees: furled stopped, reefed 6 turns, full 4 turns
    75 to 119 degrees: furled stopped, reefed 3 turns, full 2 turns
    120 to 180 degrees: furled 6 turns, reefed 2 turns, full 1 turn
    calm: stopped
  end sailing

create the capstan
  a thing, pushable
  in the Marigold

  The capstan. Turning it sets every stitch of canvas at once.

  on the player pushing
    set the Marigold's sails to full
    phrase all-sail
  end on

define phrase all-sail
  The capstan clanks round and every sail fills.
end phrase

> starboard
How many degrees?

> starboard 90 degrees
You bring the Marigold to starboard, to 90 degrees.

> ahead
The Marigold gathers way on 90 degrees.

> push capstan
The capstan clanks round and every sail fills.

With the wind from 45 and the ship on 90, she is 45 degrees off it: under furled sails that band is stopped, and under full it is four turns a step, so the capstan is what gets her moving. Turn her to 180 and she runs before the wind at one turn a step.

Edges under sail

An edge of the expanse with no blocked-exit line of its own is weather under use sailing: a sailing vehicle that reaches it is driven back with the stock line "Wind and sea drive you back." A written edge line, or override message, still wins.