Press n or j to go to the next uncovered block, b, p or k for the previous block.
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73x | // region.js — Region effects (port of region.c)
// C ref: region.c — 1408 lines
//
// Regions are area effects (gas clouds, force fields) that persist
// across turns and affect monsters/hero that enter them.
import { game } from './gstate.js';
import { c_d, rn2, rnd, rn1 } from './rng.js';
import { You, You_see, Your, impossible, pline, pline1, pline_The } from './pline.js';
import { cansee } from './vision.js';
import { isok, COLNO, ROWNO, MONST_INC, M_POISONGAS_OK, u_at,
PLNMSG_ENVELOPED_IN_GAS, ACCESSIBLE, KILLED_BY_AN,
FM_FMON, M_SEEN_POISON, TELEDS_NO_FLAGS } from './const.js';
import { m_at, levl } from './map_access.js';
import { block_point, canseemon, cmap_to_glyph, does_block, newsym, show_glyph, unblock_point } from './display.js';
import { DEADMONSTER, m_monnam, Monnam, setmangry, wake_nearto } from './mon.js';
import { S_poisoncloud, S_cloud } from './symbols.js';
import { AD_RBRE, AT_BREA, mons, PM_FOG_CLOUD, PM_HEZROU, PM_LONG_WORM, PM_VROCK, S_EEL, AD_DRST } from './monsters.js';
import { EYE, LUNG } from './const.js';
import { makeplural } from './objnam.js';
import { body_part } from './polyself.js';
import { attacktype_fordmg, breathless, haseyes, is_silent, is_vampshifter, nonliving, resists_poison } from './mondata.js';
import { monstseesu, monstunseesu } from './mondata.js';
import { Blind, BlindedTimeout, Breathless, Half_gas_damage, Is_waterlevel, Maybe_Half_Phys, Poison_resistance, Underwater } from './macros.js';
import { is_pool, is_lava } from './dbridge.js';
import { plur } from './hacklib.js';
import { losehp, killed, monkilled } from './hack.js';
import { make_blinded } from './potion.js';
import { safe_teleds } from './teleport.js';
import { set_itimeout } from './timeout.js';
import { distu } from './hacklib.js';
// ── Local stubs for deps not yet fully ported ──
// block_point: imported from display.js
// does_block: imported from display.js
// show_glyph: imported from display.js
// cmap_to_glyph: imported from display.js
function find_mid(id, flags) { // TODO: proper implementation
if (!game.level?.monsters) return null;
for (const m of game.level.monsters) {
if (m && m.m_id === id) return m;
}
return null;
}
// C ref: mon.c:311 — m_poisongas_ok: is monster OK with poison gas?
// Returns M_POISONGAS_OK(2), M_POISONGAS_MINOR(1), or M_POISONGAS_BAD(0)
function m_poisongas_ok(mtmp) {
const M_POISONGAS_OK = 2, M_POISONGAS_MINOR = 1, M_POISONGAS_BAD = 0;
const is_you = (mtmp === game.youmonst);
// Non-living, non-breathing, immune monsters are not concerned
if (nonliving(mtmp?.data) || is_vampshifter(mtmp)
|| breathless(mtmp?.data)
|| mtmp?.data === mons[PM_HEZROU] || mtmp?.data === mons[PM_VROCK])
return M_POISONGAS_OK;
// Eels in water or water level
const px = is_you ? (game.u?.ux ?? 0) : (mtmp.mx ?? 0);
const py = is_you ? (game.u?.uy ?? 0) : (mtmp.my ?? 0);
if ((mtmp?.data?.mlet === S_EEL || Is_waterlevel(game.u?.uz))
&& is_pool(px, py))
return M_POISONGAS_OK;
// Poison gas breath attack
if (attacktype_fordmg(mtmp?.data, AT_BREA, AD_DRST)
|| attacktype_fordmg(mtmp?.data, AT_BREA, AD_RBRE))
return M_POISONGAS_OK;
// Hero-specific checks
if (is_you && (Breathless() || Underwater()))
return M_POISONGAS_OK;
if (is_you ? Poison_resistance() : resists_poison(mtmp))
return M_POISONGAS_MINOR;
return M_POISONGAS_BAD;
}
function lookup_id_mapping(oldid, newid_ref) { return false; } // TODO: bones
// pline1 imported from pline.js
// ── Callback indices (match C's callbacks[] array) ──
const NO_CALLBACK = -1;
const INSIDE_GAS_CLOUD = 0;
const EXPIRE_GAS_CLOUD = 1;
// ── player_flags bits (from region.h) ──
const REG_HERO_INSIDE = 0x01;
const REG_NOT_HEROS = 0x02;
function hero_inside(r) { return !!(r.player_flags & REG_HERO_INSIDE); }
function heros_fault(r) { return !(r.player_flags & REG_NOT_HEROS); }
function set_hero_inside(r) { r.player_flags |= REG_HERO_INSIDE; }
function clear_hero_inside(r) { r.player_flags &= ~REG_HERO_INSIDE; }
function set_heros_fault(r) { r.player_flags &= ~REG_NOT_HEROS; }
function clear_heros_fault(r) { r.player_flags |= REG_NOT_HEROS; }
// ── Callback dispatch ──
const callbacks = [
inside_gas_cloud, // INSIDE_GAS_CLOUD = 0
expire_gas_cloud, // EXPIRE_GAS_CLOUD = 1
];
// ── Region list accessors ──
// C uses gr.regions[] with svn.n_regions count.
// JS uses game.level.regions[] with .length as count.
function get_regions() {
if (!game.level) return [];
if (!game.level.regions) game.level.regions = [];
return game.level.regions;
}
function n_regions() {
return get_regions().length;
}
// ── inside_rect: is point inside rectangle? ──
// C ref: region.c:53
export function inside_rect(r, x, y) {
return x >= r.lx && x <= r.hx && y >= r.ly && y <= r.hy;
}
// ── inside_region: check if point is inside a region ──
// C ref: region.c:62
export function inside_region(reg, x, y) {
if (!reg || !inside_rect(reg.bounding_box, x, y))
return false;
for (let i = 0; i < reg.nrects; i++)
if (inside_rect(reg.rects[i], x, y))
return true;
return false;
}
// ── create_region: create but do not activate a region ──
// C ref: region.c:79
export function create_region(rects, nrect) {
const reg = {};
// Determine bounding box
if (nrect > 0) {
reg.bounding_box = { ...rects[0] };
} else {
reg.bounding_box = { lx: COLNO, ly: ROWNO, hx: 0, hy: 0 };
}
reg.nrects = nrect;
reg.rects = [];
for (let i = 0; i < nrect; i++) {
if (rects[i].lx < reg.bounding_box.lx)
reg.bounding_box.lx = rects[i].lx;
if (rects[i].ly < reg.bounding_box.ly)
reg.bounding_box.ly = rects[i].ly;
if (rects[i].hx > reg.bounding_box.hx)
reg.bounding_box.hx = rects[i].hx;
if (rects[i].hy > reg.bounding_box.hy)
reg.bounding_box.hy = rects[i].hy;
reg.rects[i] = { ...rects[i] };
}
reg.ttl = -1; // Defaults
reg.attach_2_u = false;
reg.attach_2_m = 0;
reg.enter_msg = null;
reg.leave_msg = null;
reg.expire_f = NO_CALLBACK;
reg.enter_f = NO_CALLBACK;
reg.can_enter_f = NO_CALLBACK;
reg.leave_f = NO_CALLBACK;
reg.can_leave_f = NO_CALLBACK;
reg.inside_f = NO_CALLBACK;
reg.player_flags = 0;
clear_hero_inside(reg);
clear_heros_fault(reg);
reg.n_monst = 0;
reg.max_monst = 0;
reg.monsters = [];
reg.arg = { a_int: 0 }; // cg.zeroany
reg.visible = false;
reg.glyph = cmap_to_glyph(0); // canonical S_stone glyph (no visible region)
return reg;
}
// ── add_rect_to_reg: add rectangle to region ──
// C ref: region.c:133
export function add_rect_to_reg(reg, rect) {
reg.rects.push({ ...rect });
reg.nrects++;
// Update bounding box if needed
if (reg.bounding_box.lx > rect.lx)
reg.bounding_box.lx = rect.lx;
if (reg.bounding_box.ly > rect.ly)
reg.bounding_box.ly = rect.ly;
if (reg.bounding_box.hx < rect.hx)
reg.bounding_box.hx = rect.hx;
if (reg.bounding_box.hy < rect.hy)
reg.bounding_box.hy = rect.hy;
}
// ── add_mon_to_reg: add a monster to the region ──
// C ref: region.c:161
export function add_mon_to_reg(reg, mon) {
if (mon_in_region(reg, mon)) {
if (mon.data !== mons[PM_LONG_WORM])
impossible(`add_mon_to_reg: ${m_monnam(mon)} [#${mon.m_id}] already in region.`);
return;
}
if (reg.max_monst <= reg.n_monst) {
reg.max_monst += MONST_INC;
}
reg.monsters[reg.n_monst++] = mon.m_id;
}
// ── remove_mon_from_reg: remove monster from region ──
// C ref: region.c:192
export function remove_mon_from_reg(reg, mon) {
for (let i = 0; i < reg.n_monst; i++)
if (reg.monsters[i] === mon.m_id) {
reg.n_monst--;
reg.monsters[i] = reg.monsters[reg.n_monst];
return;
}
}
// ── mon_in_region: check if monster is in region ──
// C ref: region.c:210
export function mon_in_region(reg, mon) {
for (let i = 0; i < reg.n_monst; i++)
if (reg.monsters[i] === mon.m_id)
return true;
return false;
}
// ── free_region: free a region ──
// C ref: region.c:263
export function free_region(reg) {
// In JS, garbage collection handles memory.
// Nothing explicit to do, but we keep the function for API parity.
}
// ── add_region: add region to the list and activate it ──
// C ref: region.c:284
export function add_region(reg) {
const regions = get_regions();
regions.push(reg);
// Check for monsters inside the region
for (let i = reg.bounding_box.lx; i <= reg.bounding_box.hx; i++)
for (let j = reg.bounding_box.ly; j <= reg.bounding_box.hy; j++) {
let is_inside = false;
// Some regions can cross the level boundaries
if (!isok(i, j))
continue;
if (inside_region(reg, i, j)) {
is_inside = true;
const mtmp = m_at(i, j);
if (mtmp) {
add_mon_to_reg(reg, mtmp);
}
}
if (reg.visible) {
if (is_inside)
block_point(i, j);
if (cansee(i, j))
newsym(i, j);
}
}
// Check for player now
if (inside_region(reg, game.u.ux, game.u.uy))
set_hero_inside(reg);
else
clear_hero_inside(reg);
}
// ── remove_region: remove region from list and free it ──
// C ref: region.c:344
export function remove_region(reg) {
const regions = get_regions();
let i;
for (i = 0; i < regions.length; i++)
if (regions[i] === reg)
break;
if (i === regions.length)
return;
// remove region before potential newsym() calls, but don't free it yet
const last = regions.length - 1;
if (last !== i)
regions[i] = regions[last];
regions.length = last;
// Update screen if necessary
reg.ttl = -2; // for visible_region_at
if (reg.visible) {
let pass;
const tmp_uinwater = game.u.uinwater;
for (pass = 1; pass <= (Blind() ? 1 : 2); ++pass) {
game.u.uinwater = (pass === 1) ? 0 : tmp_uinwater;
for (let x = reg.bounding_box.lx; x <= reg.bounding_box.hx; x++)
for (let y = reg.bounding_box.ly; y <= reg.bounding_box.hy; y++)
if (isok(x, y) && inside_region(reg, x, y)) {
if (pass === 1) {
if (!does_block(x, y, levl(x, y)))
unblock_point(x, y);
} else { // pass==2
if (cansee(x, y))
newsym(x, y);
}
}
}
game.u.uinwater = tmp_uinwater;
}
free_region(reg);
}
// ── clear_regions: remove all regions ──
// C ref: region.c:394
export function clear_regions() {
const regions = get_regions();
for (let i = 0; i < regions.length; i++)
free_region(regions[i]);
if (game.level) game.level.regions = [];
}
// ── run_regions: process all active regions every turn ──
// C ref: region.c:414
export async function run_regions() {
const regions = get_regions();
if (!regions.length) return;
// reset some messaging variables
game.gas_cloud_diss_within = false;
game.gas_cloud_diss_seen = 0;
// End of life? Do it backward because the array will be modified
for (let i = regions.length - 1; i >= 0; i--) {
if (regions[i].ttl === 0) {
const f_indx = regions[i].expire_f;
if (f_indx === NO_CALLBACK
|| callbacks[f_indx](regions[i], null))
remove_region(regions[i]);
}
}
// Process remaining regions
for (let i = 0; i < regions.length; i++) {
// Make the region age
if (regions[i].ttl > 0)
regions[i].ttl--;
// Check if player is inside region
let f_indx = regions[i].inside_f;
if (f_indx !== NO_CALLBACK && hero_inside(regions[i]))
await callbacks[f_indx](regions[i], null);
// Check if any monster is inside region
if (f_indx !== NO_CALLBACK) {
for (let j = 0; j < regions[i].n_monst; j++) {
const mtmp = find_mid(regions[i].monsters[j], FM_FMON);
if (!mtmp || DEADMONSTER(mtmp)
|| await callbacks[f_indx](regions[i], mtmp)) {
// The monster died, remove it from list
const k = (regions[i].n_monst -= 1);
regions[i].monsters[j] = regions[i].monsters[k];
regions[i].monsters[k] = 0;
--j; // current slot has been reused; recheck it next
}
}
}
}
if (game.gas_cloud_diss_within) {
await pline_The("gas cloud around you dissipates.");
if ((game.u.xray_range || 0) <= 1)
game.gas_cloud_diss_seen = 0;
game.gas_cloud_diss_within = false;
}
if (game.gas_cloud_diss_seen) {
await You_see(
`${game.gas_cloud_diss_seen === 1 ? "a" : "some"} gas cloud${plur(game.gas_cloud_diss_seen)} dissipate.`
);
game.gas_cloud_diss_seen = 0;
}
}
// ── in_out_region: check player enters/leaves regions ──
// C ref: region.c:480
export async function in_out_region(x, y) {
const regions = get_regions();
let f_indx = 0;
// First check if hero can do the move
for (let i = 0; i < regions.length; i++) {
if (regions[i].attach_2_u)
continue;
if (inside_region(regions[i], x, y)
? (!hero_inside(regions[i])
&& (f_indx = regions[i].can_enter_f) !== NO_CALLBACK)
: (hero_inside(regions[i])
&& (f_indx = regions[i].can_leave_f) !== NO_CALLBACK)) {
if (!callbacks[f_indx](regions[i], null))
return false;
}
}
// Callbacks for the regions hero does leave
for (let i = 0; i < regions.length; i++) {
if (regions[i].attach_2_u)
continue;
if (hero_inside(regions[i])
&& !inside_region(regions[i], x, y)) {
clear_hero_inside(regions[i]);
if (regions[i].leave_msg !== null)
await pline1(regions[i].leave_msg);
if ((f_indx = regions[i].leave_f) !== NO_CALLBACK)
callbacks[f_indx](regions[i], null);
}
}
// Callbacks for the regions hero does enter
for (let i = 0; i < regions.length; i++) {
if (regions[i].attach_2_u)
continue;
if (!hero_inside(regions[i])
&& inside_region(regions[i], x, y)) {
set_hero_inside(regions[i]);
if (regions[i].enter_msg !== null)
await pline1(regions[i].enter_msg);
if ((f_indx = regions[i].enter_f) !== NO_CALLBACK)
callbacks[f_indx](regions[i], null);
}
}
return true;
}
// ── m_in_out_region: check monster enters/leaves regions ──
// C ref: region.c:533
export function m_in_out_region(mon, x, y) {
const regions = get_regions();
let f_indx = 0;
// First check if mon can do the move
for (let i = 0; i < regions.length; i++) {
if (regions[i].attach_2_m === mon.m_id)
continue;
if (inside_region(regions[i], x, y)
? (!mon_in_region(regions[i], mon)
&& (f_indx = regions[i].can_enter_f) !== NO_CALLBACK)
: (mon_in_region(regions[i], mon)
&& (f_indx = regions[i].can_leave_f) !== NO_CALLBACK)) {
if (!callbacks[f_indx](regions[i], mon))
return false;
}
}
// Callbacks for the regions mon does leave
for (let i = 0; i < regions.length; i++) {
if (regions[i].attach_2_m === mon.m_id)
continue;
if (mon_in_region(regions[i], mon)
&& !inside_region(regions[i], x, y)) {
remove_mon_from_reg(regions[i], mon);
if ((f_indx = regions[i].leave_f) !== NO_CALLBACK)
callbacks[f_indx](regions[i], mon);
}
}
// Callbacks for the regions mon does enter
for (let i = 0; i < regions.length; i++) {
if (regions[i].attach_2_m === mon.m_id)
continue;
if (!mon_in_region(regions[i], mon)
&& inside_region(regions[i], x, y)) {
add_mon_to_reg(regions[i], mon);
if ((f_indx = regions[i].enter_f) !== NO_CALLBACK)
callbacks[f_indx](regions[i], mon);
}
}
return true;
}
// ── update_player_regions: after teleport etc. ──
// C ref: region.c:582
export function update_player_regions() {
const regions = get_regions();
for (let i = 0; i < regions.length; i++)
if (!regions[i].attach_2_u
&& inside_region(regions[i], game.u.ux, game.u.uy))
set_hero_inside(regions[i]);
else
clear_hero_inside(regions[i]);
}
// ── update_monster_region: update regions for a monster ──
// C ref: region.c:598
export function update_monster_region(mon) {
const regions = get_regions();
for (let i = 0; i < regions.length; i++) {
if (inside_region(regions[i], mon.mx, mon.my)) {
if (!mon_in_region(regions[i], mon))
add_mon_to_reg(regions[i], mon);
} else {
if (mon_in_region(regions[i], mon))
remove_mon_from_reg(regions[i], mon);
}
}
}
// ── reg_damg: per-turn damage from visible region ──
// C ref: region.c:651
export function reg_damg(reg) {
const damg = (!reg.visible || reg.ttl === -2) ? 0 : reg.arg.a_int;
return damg;
}
// ── any_visible_region: check if level has any visible regions ──
// C ref: region.c:660
export function any_visible_region() {
const regions = get_regions();
for (let i = 0; i < regions.length; i++) {
if (!regions[i].visible || regions[i].ttl === -2)
continue;
return true;
}
return false;
}
// ── visible_region_at: return visible region at position, or null ──
// C ref: region.c:718
export function visible_region_at(x, y) {
const regions = get_regions();
for (let i = 0; i < regions.length; i++) {
if (!regions[i].visible || regions[i].ttl === -2)
continue;
if (inside_region(regions[i], x, y))
return regions[i];
}
return null;
}
// ── show_region ──
// C ref: region.c:732
export function show_region(reg, x, y) {
show_glyph(x, y, reg.glyph);
}
// ── region_at: check if any region at position (used externally) ──
export function region_at(x, y) {
const regions = get_regions();
for (let i = 0; i < regions.length; i++) {
if (inside_region(regions[i], x, y))
return regions[i];
}
return null;
}
// ── save_regions ──
// C ref: region.c:741
export function save_regions(nhfp) {
const regions = get_regions();
// timestamp
nhfp.writeLong(game.moves || 0);
nhfp.writeInt(regions.length);
for (let i = 0; i < regions.length; i++) {
const r = regions[i];
nhfp.writeNhRect(r.bounding_box);
nhfp.writeShort(r.nrects);
for (let j = 0; j < r.nrects; j++) {
nhfp.writeNhRect(r.rects[j]);
}
nhfp.writeBoolean(r.attach_2_u);
nhfp.writeUnsigned(r.attach_2_m);
const enter_msg_len = r.enter_msg ? r.enter_msg.length : 0;
nhfp.writeUnsigned(enter_msg_len);
if (enter_msg_len > 0)
nhfp.writeString(r.enter_msg);
const leave_msg_len = r.leave_msg ? r.leave_msg.length : 0;
nhfp.writeUnsigned(leave_msg_len);
if (leave_msg_len > 0)
nhfp.writeString(r.leave_msg);
nhfp.writeLong(r.ttl);
nhfp.writeShort(r.expire_f);
nhfp.writeShort(r.can_enter_f);
nhfp.writeShort(r.enter_f);
nhfp.writeShort(r.can_leave_f);
nhfp.writeShort(r.leave_f);
nhfp.writeShort(r.inside_f);
nhfp.writeUnsigned(r.player_flags);
nhfp.writeShort(r.n_monst);
for (let j = 0; j < r.n_monst; j++) {
nhfp.writeUnsigned(r.monsters[j]);
}
nhfp.writeBoolean(r.visible);
nhfp.writeInt(r.glyph);
nhfp.writeAny(r.arg);
}
if (nhfp.release_data) {
clear_regions();
}
}
// ── rest_regions ──
// C ref: region.c:799
export function rest_regions(nhfp) {
clear_regions(); // Just for security
let tmstamp = nhfp.readLong();
const ghostly = nhfp.ghostly || false;
if (ghostly)
tmstamp = 0;
else
tmstamp = (game.moves || 0) - tmstamp;
const n_reg = nhfp.readInt();
const regions = get_regions();
for (let i = 0; i < n_reg; i++) {
const r = {};
r.bounding_box = nhfp.readNhRect();
r.nrects = nhfp.readShort();
r.rects = [];
for (let j = 0; j < r.nrects; j++) {
r.rects[j] = nhfp.readNhRect();
}
r.attach_2_u = nhfp.readBoolean();
r.attach_2_m = nhfp.readUnsigned();
let n = nhfp.readUnsigned();
if (n > 0) {
r.enter_msg = nhfp.readString(n);
} else {
r.enter_msg = null;
}
n = nhfp.readUnsigned();
if (n > 0) {
r.leave_msg = nhfp.readString(n);
} else {
r.leave_msg = null;
}
r.ttl = nhfp.readLong();
// check for expired region
if (r.ttl >= 0)
r.ttl = (r.ttl > tmstamp) ? r.ttl - tmstamp : 0;
r.expire_f = nhfp.readShort();
r.can_enter_f = nhfp.readShort();
r.enter_f = nhfp.readShort();
r.can_leave_f = nhfp.readShort();
r.leave_f = nhfp.readShort();
r.inside_f = nhfp.readShort();
r.player_flags = nhfp.readUnsigned();
if (ghostly) {
clear_hero_inside(r);
clear_heros_fault(r);
}
r.n_monst = nhfp.readShort();
r.monsters = [];
r.max_monst = r.n_monst;
for (let j = 0; j < r.n_monst; j++) {
r.monsters[j] = nhfp.readUnsigned();
}
r.visible = nhfp.readBoolean();
r.glyph = nhfp.readInt();
r.arg = nhfp.readAny();
regions.push(r);
}
// remove expired regions; also update monster lists if bones
for (let i = regions.length - 1; i >= 0; i--) {
const r = regions[i];
if (r.ttl === 0)
remove_region(r);
else if (ghostly && r.n_monst > 0)
reset_region_mids(r);
}
}
// ── reset_region_mids: update monster IDs for bones ──
// C ref: region.c:928
function reset_region_mids(reg) {
let i = 0, n = reg.n_monst;
const mid_list = reg.monsters;
while (i < n) {
const result = { value: mid_list[i] };
if (!lookup_id_mapping(mid_list[i], result)) {
// shrink list to remove missing monster
mid_list[i] = mid_list[--n];
} else {
mid_list[i] = result.value;
++i;
}
}
reg.n_monst = n;
}
// ── update_regions: update all regions (alias for update_player_regions) ──
export function update_regions() {
update_player_regions();
}
// ── valid_cloud_pos: check if position is valid for gas cloud ──
// C ref: read.c:1069
// C ref: region.c:1158 valid_cloud_pos()
export function valid_cloud_pos(x, y) {
if (!isok(x, y))
return false;
const lev = levl(x, y);
return ACCESSIBLE(lev?.typ) || is_pool(x, y) || is_lava(x, y);
}
// ── is_hero_inside_gas_cloud ──
// C ref: region.c:1168
function is_hero_inside_gas_cloud() {
const regions = get_regions();
for (let i = 0; i < regions.length; i++)
if (hero_inside(regions[i])
&& regions[i].inside_f === INSIDE_GAS_CLOUD)
return true;
return false;
}
// ── make_gas_cloud: common details for gas cloud creation ──
// C ref: region.c:1182
async function make_gas_cloud(cloud, damage, inside_cloud) {
if (!game.in_mklev && !game.context?.mon_moving)
set_heros_fault(cloud); // assume player has created it
cloud.inside_f = INSIDE_GAS_CLOUD;
cloud.expire_f = EXPIRE_GAS_CLOUD;
cloud.arg = { a_int: damage };
cloud.visible = true;
cloud.glyph = cmap_to_glyph(damage ? S_poisoncloud : S_cloud);
add_region(cloud);
if (!game.in_mklev && !inside_cloud && is_hero_inside_gas_cloud()) {
await You(`are enveloped in a cloud of ${damage ? "noxious gas" : "steam"}!`);
game.iflags.last_msg = PLNMSG_ENVELOPED_IN_GAS;
}
}
// ── create_gas_cloud: create a gas cloud via BFS ──
// C ref: region.c:1213
const MAX_CLOUD_SIZE = 150;
export async function create_gas_cloud(x, y, cloudsize, damage) {
const xcoords = new Array(MAX_CLOUD_SIZE);
const ycoords = new Array(MAX_CLOUD_SIZE);
xcoords[0] = x;
ycoords[0] = y;
let newidx = 1; // initial spot is already taken
let inside_cloud = is_hero_inside_gas_cloud();
// a single-point cloud on hero and it deals no damage
if (!game.context?.mon_moving && u_at(x, y) && cloudsize === 1
&& (!damage
|| (damage && m_poisongas_ok(game.youmonst) === M_POISONGAS_OK)))
inside_cloud = true;
if (cloudsize > MAX_CLOUD_SIZE) {
impossible(`create_gas_cloud: cloud too large (${cloudsize})!`);
cloudsize = MAX_CLOUD_SIZE;
}
for (let curridx = 0; curridx < newidx; curridx++) {
if (newidx >= cloudsize)
break;
const xx = xcoords[curridx];
const yy = ycoords[curridx];
// Primitive Fisher-Yates-Knuth shuffle
const dirs = [ {x: 0, y: -1}, {x: 0, y: 1}, {x: -1, y: 0}, {x: 1, y: 0} ];
for (let ii = 4; ii > 0; --ii) {
const swapidx = rn2(ii);
const tmp = dirs[swapidx];
dirs[swapidx] = dirs[ii - 1];
dirs[ii - 1] = tmp;
}
let nvalid = 0;
for (let ii = 0; ii < 4; ++ii) {
const dx = dirs[ii].x, dy = dirs[ii].y;
let isunpicked = true;
if (valid_cloud_pos(xx + dx, yy + dy)) {
nvalid++;
for (let j = 0; j < newidx; ++j) {
if (xcoords[j] === xx + dx && ycoords[j] === yy + dy) {
isunpicked = false;
break;
}
}
// randomly disrupt the natural BFS
if (nvalid === 4 && !rn2(2))
continue;
if (isunpicked) {
xcoords[newidx] = xx + dx;
ycoords[newidx] = yy + dy;
newidx++;
}
}
if (newidx >= cloudsize) {
break;
}
}
}
// Create the region from collected coordinates
const cloud = create_region([], 0);
for (let i = 0; i < newidx; ++i) {
const tmprect = { lx: xcoords[i], hx: xcoords[i],
ly: ycoords[i], hy: ycoords[i] };
add_rect_to_reg(cloud, tmprect);
}
cloud.ttl = rn1(3, 4);
// If cloud was constrained in small space, give it more time to live
cloud.ttl = Math.trunc((cloud.ttl * cloudsize) / newidx);
await make_gas_cloud(cloud, damage, inside_cloud);
return cloud;
}
// ── expire_gas_cloud: callback when gas cloud TTL reaches 0 ──
// C ref: region.c:1046
export function expire_gas_cloud(p1, p2) {
const reg = p1;
let damage = reg.arg.a_int;
// If it was a thick cloud, it dissipates a little first
if (damage >= 5) {
damage = Math.trunc(damage / 2);
reg.arg = { a_int: damage };
reg.ttl = 2; // reset ttl
return false; // "still there"
}
// The cloud no longer blocks vision
for (let pass = 1; pass <= (Blind() ? 1 : 2); ++pass) {
for (let x = reg.bounding_box.lx; x <= reg.bounding_box.hx; x++) {
for (let y = reg.bounding_box.ly; y <= reg.bounding_box.hy; y++) {
if (inside_region(reg, x, y)) {
if (pass === 1) {
if (!does_block(x, y, levl(x, y)))
unblock_point(x, y);
} else { // pass==2
if (!game.u.uswallow) {
if (u_at(x, y))
game.gas_cloud_diss_within = true;
else if (cansee(x, y))
game.gas_cloud_diss_seen = (game.gas_cloud_diss_seen || 0) + 1;
}
}
}
}
}
}
return true; // OK, it's gone
}
// ── inside_gas_cloud: callback for creature inside gas cloud ──
// C ref: region.c:1091
// Returns true if p2 (monster) is killed, false otherwise
export async function inside_gas_cloud(p1, p2) {
const reg = p1;
const mtmp = p2;
const umon = mtmp ? mtmp : game.youmonst;
const dam = reg.arg.a_int;
// fog clouds maintain gas clouds
if (reg.ttl < 20 && umon && umon.data === mons[PM_FOG_CLOUD])
reg.ttl += 5;
if (dam < 1)
return false; // no damage, nothing to do
if (!mtmp) { // hero
if (m_poisongas_ok(game.youmonst) === M_POISONGAS_OK)
return false;
if (!Blind()) {
await Your(`${makeplural(body_part(EYE))} sting.`);
await make_blinded(1, false);
}
if (!Poison_resistance()) {
await pline(`Something is burning your ${makeplural(body_part(LUNG))}!`);
await You("cough and spit blood!");
wake_nearto(game.u.ux, game.u.uy, 2);
let dmg = Maybe_Half_Phys(rnd(dam) + 5);
if (Half_gas_damage())
dmg = Math.trunc((dmg + 1) / 2);
await losehp(dmg, "gas cloud", KILLED_BY_AN);
monstunseesu(M_SEEN_POISON);
return false;
} else {
await You("cough!");
wake_nearto(game.u.ux, game.u.uy, 2);
monstseesu(M_SEEN_POISON);
return false;
}
} else { // A monster is inside the cloud
if (m_poisongas_ok(mtmp) !== M_POISONGAS_OK) {
if (!is_silent(mtmp.data)) {
if (cansee(mtmp.mx, mtmp.my)
|| (distu(mtmp.mx, mtmp.my) < 8))
await pline(`${Monnam(mtmp)} coughs!`);
wake_nearto(mtmp.mx, mtmp.my, 2);
}
if (heros_fault(reg))
await setmangry(mtmp, true);
if (haseyes(mtmp.data) && mtmp.mcansee) {
mtmp.mblinded = 1;
mtmp.mcansee = 0;
}
if (resists_poison(mtmp))
return false;
mtmp.mhp -= rnd(dam) + 5;
if (DEADMONSTER(mtmp)) {
if (heros_fault(reg))
await killed(mtmp);
else
await monkilled(mtmp, "gas cloud", AD_DRST);
if (DEADMONSTER(mtmp)) { // not lifesaved
return true;
}
}
}
}
return false; // Monster is still alive
}
// ── gas_cloud_in_sight: check if hero can see a gas cloud ──
// (Utility used externally)
export function gas_cloud_in_sight() {
const regions = get_regions();
for (let i = 0; i < regions.length; i++) {
if (!regions[i].visible || regions[i].ttl === -2)
continue;
if (regions[i].inside_f === INSIDE_GAS_CLOUD) {
for (let x = regions[i].bounding_box.lx; x <= regions[i].bounding_box.hx; x++)
for (let y = regions[i].bounding_box.ly; y <= regions[i].bounding_box.hy; y++)
if (inside_region(regions[i], x, y) && cansee(x, y))
return true;
}
}
return false;
}
// ── region_danger: is hero at risk from regions? (prayer check) ──
// C ref: region.c:1342
export function region_danger() {
const regions = get_regions();
let n = 0;
for (let i = 0; i < regions.length; i++) {
if (!hero_inside(regions[i]))
continue;
const f_indx = regions[i].inside_f;
if (f_indx === INSIDE_GAS_CLOUD) {
if (nonliving(game.youmonst?.data) || Breathless())
continue;
if (Poison_resistance())
continue;
++n;
}
}
return n ? true : false;
}
// ── region_safety: fix trouble from regions at end of prayer ──
// C ref: region.c:1368
export async function region_safety() {
let r = null;
const regions = get_regions();
let n = 0;
for (let i = 0; i < regions.length; i++) {
if (!hero_inside(regions[i]))
continue;
const f_indx = regions[i].inside_f;
if (f_indx === INSIDE_GAS_CLOUD) {
if (!n++ && regions[i].ttl >= 0)
r = regions[i];
}
}
if (n > 1 || (n === 1 && !r)) {
await safe_teleds(TELEDS_NO_FLAGS);
if (region_danger()) {
set_itimeout('HMagical_breathing', c_d(4, 4) + 4);
await You("feel able to breathe.");
}
} else if (r) {
remove_region(r);
await pline_The("gas cloud enveloping you dissipates.");
} else {
await pline_The("gas cloud has dissipated.");
}
// maybe cure blindness too
if (BlindedTimeout() === 1)
await make_blinded(0, true);
}
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