Las Reliquias de Tolti Aph
An interactive fiction by Graham Nelson (2005) - the Inform 7 source text
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A spatial coordinate is a kind of value. <9,24,24> specifies a spatial coordinate with parts maze level, easting (without leading zeros), northing (without leading zeros). A room has a spatial coordinate called grid position. Definition: A room is unlocated if its grid position is <0,0,0>. Definition: A room is located if it is not unlocated.[1]
To decide which number is the current maze level:
let L be the maze level part of the grid position of the location;
decide on L.
The previous maze level is a number that varies.
Every turn:
if the location is a labyrinth room and the location is not the Arco de Seto
begin;
if the current maze level is not the previous maze level
begin;
if the current maze level is 1, say "Parpadeas en la penumbra, a pesar de estar bajo la luz natural del crepúsculo, sintiendo nuevamente una leve brisa en tu cara. Estás de vuelta en el familiar laberinto vallado, en la superficie.";
if the previous maze level is 1, say "Subsuelo. El laberinto parece extenderse en pasajes mágicamente iluminados; oradados en la roca con precisión.";
end if;
end if;
change the previous maze level to the current maze level.
A direction has a spatial coordinate called vector. North has vector <0,0,1>. South has vector <0,0,24>. East has vector <0,1,0>. West has vector <0,24,0>. Down has vector <1,0,0>. Up has vector <9,0,0>.[2] Definition: A direction is vectorial if its vector is not <0,0,0>.[3] Definition: A direction is vertical if it is up or it is down.
To decide which spatial coordinate is the vector sum of (V1 - a spatial coordinate) and (V2 - a spatial coordinate):
let L be the maze level part of V1 plus the maze level part of V2;
let L be the remainder after dividing L by 10;
let E be the easting part of V1 plus the easting part of V2;
let E be the remainder after dividing E by 25;
let N be the northing part of V1 plus the northing part of V2;
let N be the remainder after dividing N by 25;
if L is 0 or L is 9, decide on <0,0,0>;
if E is 0 or E is 24, decide on <0,0,0>;
if N is 0 or N is 24, decide on <0,0,0>;
let the sum be the spatial coordinate with maze level part L easting part E northing part N;
decide on the sum.[4]
To decide which spatial coordinate is the vector difference of (V1 - a spatial coordinate) and (V2 - a spatial coordinate):
let L be the maze level part of V1 minus the maze level part of V2;
let L be the remainder after dividing L by 10;
let E be the easting part of V1 minus the easting part of V2;
let E be the remainder after dividing E by 25;
let N be the northing part of V1 minus the northing part of V2;
let N be the remainder after dividing N by 25;
let the sum be the spatial coordinate with maze level part L easting part E northing part N;
decide on the sum.
Notes
[1]. Inform no construye automáticamente los refijos un-: son demasiado impredecibles en Inglés. Por ejemplo, en ROTA "undead" tiene una definición que para nada es equivalente a "not dead".
[2]. Como esto demuestra, Inform permite añadir o modificar incluso los conceptos más fundamentales construidos en Inform.