Press n or j to go to the next uncovered block, b, p or k for the previous block.
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// C ref: stairs.c — stairway linked list, hero placement on stairs
import { game } from './gstate.js';
import { LR_DOWNTELE, LR_UPTELE } from './const.js';
import { place_lregion } from './mkmaze.js';
// C ref: stairs.c:8 stairway_add() — add a stairway to the linked list
export function stairway_add(x, y, up, isladder, dest) {
const stway = {
sx: x,
sy: y,
up: !!up,
isladder: !!isladder,
u_traversed: false,
tolev: { dnum: dest?.dnum ?? 0, dlevel: dest?.dlevel ?? 0 },
next: game.stairs ?? null,
};
game.stairs = stway;
}
// C ref: stairs.c:27 stairway_free_all() — clear the stairway list
export function stairway_free_all() {
game.stairs = null;
}
// C ref: stairs.c:39 stairway_at() — find stairway at position
export function stairway_at(x, y) {
for (let s = game.stairs; s; s = s.next) {
if (s.sx === x && s.sy === y) return s;
}
return null;
}
// C ref: stairs.c:50 stairway_find() — find stairway by destination level
export function stairway_find(fromdlev) {
for (let s = game.stairs; s; s = s.next) {
if (s.tolev.dnum === fromdlev.dnum && s.tolev.dlevel === fromdlev.dlevel)
return s;
}
return null;
}
// C ref: stairs.c:63 stairway_find_from() — find by destination + type
export function stairway_find_from(fromdlev, isladder) {
for (let s = game.stairs; s; s = s.next) {
if (s.tolev.dnum === fromdlev.dnum
&& s.tolev.dlevel === fromdlev.dlevel
&& s.isladder === isladder)
return s;
}
return null;
}
// C ref: stairs.c:78 stairway_find_dir() — find by direction
export function stairway_find_dir(up) {
for (let s = game.stairs; s; s = s.next) {
if (s.up === up) return s;
}
return null;
}
// C ref: stairs.c:88 stairway_find_type_dir() — find by type + direction
export function stairway_find_type_dir(isladder, up) {
for (let s = game.stairs; s; s = s.next) {
if (s.isladder === isladder && s.up === up) return s;
}
return null;
}
// C ref: stairs.c:98 stairway_find_special_dir() — find cross-dungeon stairs
export function stairway_find_special_dir(up) {
const upBool = !!up;
for (let s = game.stairs; s; s = s.next) {
if (s.tolev.dnum !== (game.u?.uz?.dnum ?? 0) && s.up !== upBool)
return s;
}
return null;
}
// C ref: dungeon.c:1568 u_on_newpos() — place hero at new position
export function u_on_newpos(x, y) {
if (!game.u) return;
game.u.ux = x;
game.u.uy = y;
game.u.uundetected = 0;
// Ridden steed shares hero position
if (game.u.usteed) {
game.u.usteed.mx = x;
game.u.usteed.my = y;
}
// When changing levels, initialize ux0/uy0
if (game.u.uz && game.u.uz0
&& (game.u.uz.dnum !== game.u.uz0.dnum
|| game.u.uz.dlevel !== game.u.uz0.dlevel)) {
game.u.ux0 = x;
game.u.uy0 = y;
}
}
// STUB: u_on_rndspot — random placement
async function u_on_rndspot(upflag) {
const up = (upflag & 1) !== 0;
const area = up ? (game.updest || {}) : (game.dndest || {});
await place_lregion(
area.lx || 0, area.ly || 0, area.hx || 0, area.hy || 0,
area.nlx || 0, area.nly || 0, area.nhx || 0, area.nhy || 0,
up ? LR_UPTELE : LR_DOWNTELE,
null
);
}
// C ref: stairs.c:113 u_on_sstairs() — place hero on special stairs
export async function u_on_sstairs(upflag) {
const stway = stairway_find_special_dir(upflag);
if (stway)
u_on_newpos(stway.sx, stway.sy);
else
await u_on_rndspot(upflag);
}
// C ref: stairs.c:125 u_on_upstairs() — place hero on upstairs
export async function u_on_upstairs() {
const stway = stairway_find_dir(true);
if (stway)
u_on_newpos(stway.sx, stway.sy);
else
await u_on_sstairs(0);
}
// C ref: stairs.c:136 u_on_dnstairs() — place hero on downstairs
export async function u_on_dnstairs() {
const stway = stairway_find_dir(false);
if (stway)
u_on_newpos(stway.sx, stway.sy);
else
await u_on_sstairs(1);
}
// C ref: stairs.c:147 On_stairs() — is position on stairs?
export function On_stairs(x, y) {
return stairway_at(x, y) !== null;
}
// C ref: stairs.c:153 On_ladder() — is position on a ladder?
export function On_ladder(x, y) {
const stway = stairway_at(x, y);
return !!(stway && stway.isladder);
}
// C ref: stairs.c:161 On_stairs_up() — is position on upstairs?
export function On_stairs_up(x, y) {
const stway = stairway_at(x, y);
return !!(stway && stway.up);
}
// C ref: stairs.c:169 On_stairs_dn() — is position on downstairs?
export function On_stairs_dn(x, y) {
const stway = stairway_at(x, y);
return !!(stway && !stway.up);
}
// C ref: stairs.c:179 known_branch_stairs()
export function known_branch_stairs(sway) {
return !!(sway && sway.tolev.dnum !== (game.u?.uz?.dnum ?? 0) && sway.u_traversed);
}
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