| abstract
| - Below is the full text to teleport.c from the source code of NetHack 3.3.0. To link to a particular line, write [[NetHack 3.3.0/teleport.c#line123]], for example. Warning! This is the source code from an old release. For the latest release, see Source code 1. /* SCCS Id: @(#)teleport.c 3.3 1999/11/27 */ 2. /* Copyright (c) Stichting Mathematisch Centrum, Amsterdam, 1985. */ 3. /* NetHack may be freely redistributed. See license for details. */ 4. 5. #include "hack.h" 6. 7. STATIC_DCL boolean FDECL(tele_jump_ok, (int,int,int,int)); 8. STATIC_DCL boolean FDECL(teleok, (int,int,BOOLEAN_P)); 9. STATIC_DCL void NDECL(vault_tele); 10. STATIC_DCL boolean FDECL(rloc_pos_ok, (int,int,struct monst *)); 11. STATIC_DCL void FDECL(mvault_tele, (struct monst *)); 12. 13. /* 14. * Is (x,y) a good position of mtmp? If mtmp is NULL, then is (x,y) good 15. * for an object? 16. * 17. * This function will only look at mtmp->mdat, so makemon, mplayer, etc can 18. * call it to generate new monster positions with fake monster structures. 19. */ 20. boolean 21. goodpos(x, y, mtmp) 22. int x,y; 23. struct monst *mtmp; 24. { 25. struct permonst *mdat = NULL; 26. 27. if (!isok(x, y)) return FALSE; 28. 29. /* in many cases, we're trying to create a new monster, which 30. * can't go on top of the player or any existing monster. 31. * however, occasionally we are relocating engravings or objects, 32. * which could be co-located and thus get restricted a bit too much. 33. * oh well. 34. */ 35. if (mtmp != &youmonst && x == u.ux && y == u.uy 36. #ifdef STEED 37. && (!u.usteed || mtmp != u.usteed) 38. #endif 39. ) 40. return FALSE; 41. 42. if (mtmp) { 43. struct monst *mtmp2 = m_at(x,y); 44. 45. if (mtmp2 && mtmp2 != mtmp) 46. return FALSE; 47. 48. mdat = mtmp->data; 49. if (is_pool(x,y)) { 50. if (mtmp == &youmonst) 51. return !!(HLevitation || Flying || Wwalking || 52. Swimming || Amphibious); 53. else return (is_flyer(mdat) || is_swimmer(mdat) || 54. is_clinger(mdat)); 55. } else if (mdat->mlet == S_EEL && rn2(13)) { 56. return FALSE; 57. } else if (is_lava(x,y)) { 58. if (mtmp == &youmonst) 59. return !!HLevitation; 60. else 61. return (is_flyer(mdat) || likes_lava(mdat)); 62. } 63. if (passes_walls(mdat) && may_passwall(x,y)) return TRUE; 64. } 65. if (!ACCESSIBLE(levl[x][y].typ)) return FALSE; 66. if (closed_door(x, y) && (!mdat || !amorphous(mdat))) 67. return FALSE; 68. if (sobj_at(BOULDER, x, y) && (!mdat || !throws_rocks(mdat))) 69. return FALSE; 70. return TRUE; 71. } 72. 73. /* 74. * "entity next to" 75. * 76. * Attempt to find a good place for the given monster type in the closest 77. * position to (xx,yy). Do so in successive square rings around (xx,yy). 78. * If there is more than one valid positon in the ring, choose one randomly. 79. * Return TRUE and the position chosen when successful, FALSE otherwise. 80. */ 81. boolean 82. enexto(cc, xx, yy, mdat) 83. coord *cc; 84. register xchar xx, yy; 85. struct permonst *mdat; 86. { 87. #define MAX_GOOD 15 88. coord good[MAX_GOOD], *good_ptr; 89. int x, y, range, i; 90. int xmin, xmax, ymin, ymax; 91. struct monst fakemon; /* dummy monster */ 92. 93. if (!mdat) { 94. #ifdef DEBUG 95. pline("enexto() called with mdat==0"); 96. #endif 97. /* default to player's original monster type */ 98. mdat = &mons[u.umonster]; 99. } 100. fakemon.data = mdat; /* set up for goodpos */ 101. good_ptr = good; 102. range = 1; 103. /* 104. * Walk around the border of the square with center (xx,yy) and 105. * radius range. Stop when we find at least one valid position. 106. */ 107. do { 108. xmin = max(1, xx-range); 109. xmax = min(COLNO-1, xx+range); 110. ymin = max(0, yy-range); 111. ymax = min(ROWNO-1, yy+range); 112. 113. for (x = xmin; x <= xmax; x++) 114. if (goodpos(x, ymin, &fakemon)) { 115. good_ptr->x = x; 116. good_ptr->y = ymin ; 117. /* beware of accessing beyond segment boundaries.. */ 118. if (good_ptr++ == &good[MAX_GOOD-1]) goto full; 119. } 120. for (x = xmin; x <= xmax; x++) 121. if (goodpos(x, ymax, &fakemon)) { 122. good_ptr->x = x; 123. good_ptr->y = ymax ; 124. /* beware of accessing beyond segment boundaries.. */ 125. if (good_ptr++ == &good[MAX_GOOD-1]) goto full; 126. } 127. for (y = ymin+1; y < ymax; y++) 128. if (goodpos(xmin, y, &fakemon)) { 129. good_ptr->x = xmin; 130. good_ptr-> y = y ; 131. /* beware of accessing beyond segment boundaries.. */ 132. if (good_ptr++ == &good[MAX_GOOD-1]) goto full; 133. } 134. for (y = ymin+1; y < ymax; y++) 135. if (goodpos(xmax, y, &fakemon)) { 136. good_ptr->x = xmax; 137. good_ptr->y = y ; 138. /* beware of accessing beyond segment boundaries.. */ 139. if (good_ptr++ == &good[MAX_GOOD-1]) goto full; 140. } 141. range++; 142. 143. /* return if we've grown too big (nothing is valid) */ 144. if (range > ROWNO && range > COLNO) return FALSE; 145. } while (good_ptr == good); 146. 147. full: 148. i = rn2((int)(good_ptr - good)); 149. cc->x = good[i].x; 150. cc->y = good[i].y; 151. return TRUE; 152. } 153. 154. /* 155. * Check for restricted areas present in some special levels. (This might 156. * need to be augmented to allow deliberate passage in wizard mode, but 157. * only for explicitly chosen destinations.) 158. */ 159. STATIC_OVL boolean 160. tele_jump_ok(x1, y1, x2, y2) 161. int x1, y1, x2, y2; 162. { 163. if (dndest.nlx > 0) { 164. /* if inside a restricted region, can't teleport outside */ 165. if (within_bounded_area(x1, y1, dndest.nlx, dndest.nly, 166. dndest.nhx, dndest.nhy) && 167. !within_bounded_area(x2, y2, dndest.nlx, dndest.nly, 168. dndest.nhx, dndest.nhy)) 169. return FALSE; 170. /* and if outside, can't teleport inside */ 171. if (!within_bounded_area(x1, y1, dndest.nlx, dndest.nly, 172. dndest.nhx, dndest.nhy) && 173. within_bounded_area(x2, y2, dndest.nlx, dndest.nly, 174. dndest.nhx, dndest.nhy)) 175. return FALSE; 176. } 177. if (updest.nlx > 0) { /* ditto */ 178. if (within_bounded_area(x1, y1, updest.nlx, updest.nly, 179. updest.nhx, updest.nhy) && 180. !within_bounded_area(x2, y2, updest.nlx, updest.nly, 181. updest.nhx, updest.nhy)) 182. return FALSE; 183. if (!within_bounded_area(x1, y1, updest.nlx, updest.nly, 184. updest.nhx, updest.nhy) && 185. within_bounded_area(x2, y2, updest.nlx, updest.nly, 186. updest.nhx, updest.nhy)) 187. return FALSE; 188. } 189. return TRUE; 190. } 191. 192. STATIC_OVL boolean 193. teleok(x, y, trapok) 194. register int x, y; 195. boolean trapok; 196. { 197. if (!trapok && t_at(x, y)) return FALSE; 198. if (!goodpos(x, y, &youmonst)) return FALSE; 199. if (!tele_jump_ok(u.ux, u.uy, x, y)) return FALSE; 200. return TRUE; 201. } 202. 203. void 204. teleds(nux, nuy) 205. register int nux,nuy; 206. { 207. if (Punished) unplacebc(); 208. u.utrap = 0; 209. u.ustuck = 0; 210. u.ux0 = u.ux; 211. u.uy0 = u.uy; 212. u.ux = nux; 213. u.uy = nuy; 214. fill_pit(u.ux0, u.uy0); /* do this now so that cansee() is correct */ 215. 216. if (hides_under(youmonst.data)) 217. u.uundetected = OBJ_AT(nux, nuy); 218. else if (youmonst.data->mlet == S_EEL) 219. u.uundetected = is_pool(u.ux, u.uy); 220. else { 221. u.uundetected = 0; 222. /* mimics stop being unnoticed */ 223. if (youmonst.data->mlet == S_MIMIC) 224. youmonst.m_ap_type = M_AP_NOTHING; 225. } 226. 227. if (u.uswallow) { 228. u.uswldtim = u.uswallow = 0; 229. docrt(); 230. } 231. if (Punished) placebc(); 232. initrack(); /* teleports mess up tracking monsters without this */ 233. update_player_regions(); 234. #ifdef STEED 235. /* Move your steed, too */ 236. if (u.usteed) { 237. u.usteed->mx = nux; 238. u.usteed->my = nuy; 239. } 240. #endif 241. /* 242. * Make sure the hero disappears from the old location. This will 243. * not happen if she is teleported within sight of her previous 244. * location. Force a full vision recalculation because the hero 245. * is now in a new location. 246. */ 247. newsym(u.ux0,u.uy0); 248. vision_full_recalc = 1; 249. nomul(0); 250. spoteffects(); 251. invocation_message(); 252. } 253. 254. boolean 255. safe_teleds() 256. { 257. register int nux, nuy, tcnt = 0; 258. 259. do { 260. nux = rnd(COLNO-1); 261. nuy = rn2(ROWNO); 262. } while (!teleok(nux, nuy, (boolean)(tcnt > 200)) && ++tcnt <= 400); 263. 264. if (tcnt <= 400) { 265. teleds(nux, nuy); 266. return TRUE; 267. } else 268. return FALSE; 269. } 270. 271. STATIC_OVL void 272. vault_tele() 273. { 274. register struct mkroom *croom = search_special(VAULT); 275. coord c; 276. 277. if (croom && somexy(croom, &c) && teleok(c.x,c.y,FALSE)) { 278. teleds(c.x,c.y); 279. return; 280. } 281. tele(); 282. } 283. 284. boolean 285. teleport_pet(mtmp, force_it) 286. register struct monst *mtmp; 287. boolean force_it; 288. { 289. register struct obj *otmp; 290. 291. #ifdef STEED 292. if (mtmp == u.usteed) 293. return (FALSE); 294. #endif 295. 296. if (mtmp->mleashed) { 297. otmp = get_mleash(mtmp); 298. if (!otmp) { 299. impossible("%s is leashed, without a leash.", Monnam(mtmp)); 300. goto release_it; 301. } 302. if (otmp->cursed && !force_it) { 303. yelp(mtmp); 304. return FALSE; 305. } else { 306. Your("leash goes slack."); 307. release_it: 308. m_unleash(mtmp); 309. return TRUE; 310. } 311. } 312. return TRUE; 313. } 314. 315. void 316. tele() 317. { 318. coord cc; 319. 320. /* Disable teleportation in stronghold && Vlad's Tower */ 321. if (level.flags.noteleport) { 322. #ifdef WIZARD 323. if (!wizard) { 324. #endif 325. pline("A mysterious force prevents you from teleporting!"); 326. return; 327. #ifdef WIZARD 328. } 329. #endif 330. } 331. 332. /* don't show trap if "Sorry..." */ 333. if (!Blinded) make_blinded(0L,FALSE); 334. 335. if ((u.uhave.amulet || On_W_tower_level(&u.uz)) && !rn2(3)) { 336. You_feel("disoriented for a moment."); 337. return; 338. } 339. if (Teleport_control 340. #ifdef WIZARD 341. || wizard 342. #endif 343. ) { 344. if (unconscious()) { 345. pline("Being unconscious, you cannot control your teleport."); 346. } else { 347. #ifdef STEED 348. char buf[BUFSZ]; 349. if (u.usteed) Sprintf(buf," and %s", mon_nam(u.usteed)); 350. #endif 351. pline("To what position do you%s want to be teleported?", 352. #ifdef STEED 353. u.usteed ? buf : 354. #endif 355. ""); 356. cc.x = u.ux; 357. cc.y = u.uy; 358. if (getpos(&cc, TRUE, "the desired position") < 0) 359. return; /* abort */ 360. /* possible extensions: introduce a small error if 361. magic power is low; allow transfer to solid rock */ 362. if (teleok(cc.x, cc.y, FALSE)) { 363. teleds(cc.x, cc.y); 364. return; 365. } 366. pline("Sorry..."); 367. } 368. } 369. 370. (void) safe_teleds(); 371. } 372. 373. int 374. dotele() 375. { 376. struct trap *trap; 377. 378. trap = t_at(u.ux, u.uy); 379. if (trap && (!trap->tseen || trap->ttyp != TELEP_TRAP)) 380. trap = 0; 381. 382. if (trap) { 383. if (trap->once) { 384. pline("This is a vault teleport, usable once only."); 385. if (yn("Jump in?") == 'n') 386. trap = 0; 387. else { 388. deltrap(trap); 389. newsym(u.ux, u.uy); 390. } 391. } 392. if (trap) 393. You("%s onto the teleportation trap.", 394. locomotion(youmonst.data, "jump")); 395. } 396. if (!trap) { 397. boolean castit = FALSE; 398. register int sp_no = 0, energy = 0; 399. 400. if (!Teleportation || (u.ulevel < (Role_if(PM_WIZARD) ? 8 : 12) 401. && !can_teleport(youmonst.data))) { 402. /* Try to use teleport away spell. */ 403. if (objects[SPE_TELEPORT_AWAY].oc_name_known && !Confusion) 404. for (sp_no = 0; sp_no < MAXSPELL; sp_no++) 405. if (spl_book[sp_no].sp_id == SPE_TELEPORT_AWAY) { 406. castit = TRUE; 407. break; 408. } 409. #ifdef WIZARD 410. if (!wizard) { 411. #endif 412. if (!castit) { 413. if (!Teleportation) 414. You("don't know that spell."); 415. else You("are not able to teleport at will."); 416. return(0); 417. } 418. #ifdef WIZARD 419. } 420. #endif 421. } 422. 423. if (u.uhunger <= 100 || ACURR(A_STR) < 6) { 424. #ifdef WIZARD 425. if (!wizard) { 426. #endif 427. You("lack the strength %s.", 428. castit ? "for a teleport spell" : "to teleport"); 429. return 1; 430. #ifdef WIZARD 431. } 432. #endif 433. } 434. 435. energy = objects[SPE_TELEPORT_AWAY].oc_level * 7 / 2 - 2; 436. if (u.uen <= energy) { 437. #ifdef WIZARD 438. if (wizard) 439. energy = u.uen; 440. else 441. #endif 442. { 443. You("lack the energy %s.", 444. castit ? "for a teleport spell" : "to teleport"); 445. return 1; 446. } 447. } 448. 449. if (check_capacity( 450. "Your concentration falters from carrying so much.")) 451. return 1; 452. 453. if (castit) { 454. exercise(A_WIS, TRUE); 455. if (spelleffects(sp_no, TRUE)) 456. return(1); 457. else 458. #ifdef WIZARD 459. if (!wizard) 460. #endif 461. return(0); 462. } else { 463. u.uen -= energy; 464. flags.botl = 1; 465. } 466. } 467. 468. if (next_to_u()) { 469. if (trap && trap->once) vault_tele(); 470. else tele(); 471. (void) next_to_u(); 472. } else { 473. You(shudder_for_moment); 474. return(0); 475. } 476. if (!trap) morehungry(100); 477. return(1); 478. } 479. 480. 481. void 482. level_tele() 483. { 484. register int newlev; 485. d_level newlevel; 486. const char *escape_by_flying = 0; /* when surviving dest of -N */ 487. 488. if ((u.uhave.amulet || In_endgame(&u.uz) || In_sokoban(&u.uz)) 489. #ifdef WIZARD 490. && !wizard 491. #endif 492. ) { 493. You_feel("very disoriented for a moment."); 494. return; 495. } 496. if (Teleport_control 497. #ifdef WIZARD 498. || wizard 499. #endif 500. ) { 501. char buf[BUFSZ], qbuf[BUFSZ]; 502. int trycnt = 0; 503. 504. Strcpy(qbuf, "To what level do you want to teleport?"); 505. do { 506. if (++trycnt == 2) Strcat(qbuf, " [type a number]"); 507. getlin(qbuf, buf); 508. if (!strcmp(buf,"\033")) /* cancelled */ 509. return; 510. else if (!strcmp(buf,"*")) 511. goto random_levtport; 512. if ((newlev = lev_by_name(buf)) == 0) newlev = atoi(buf); 513. } while (!newlev && !digit(buf[0]) && 514. (buf[0] != '-' || !digit(buf[1])) && 515. trycnt < 10); 516. 517. /* no dungeon escape via this route */ 518. if (newlev == 0) { 519. if (trycnt >= 10) 520. goto random_levtport; 521. if (ynq("Go to Nowhere. Are you sure?") != 'y') return; 522. You("scream in agony as your body begins to warp..."); 523. display_nhwindow(WIN_MESSAGE, FALSE); 524. You("cease to exist."); 525. killer_format = NO_KILLER_PREFIX; 526. killer = "committed suicide"; 527. done(DIED); 528. return; 529. } 530. 531. /* if in Knox and the requested level > 0, stay put. 532. * we let negative values requests fall into the "heaven" loop. 533. */ 534. if (Is_knox(&u.uz) && newlev > 0) { 535. You(shudder_for_moment); 536. return; 537. } 538. /* if in Quest, the player sees "Home 1", etc., on the status 539. * line, instead of the logical depth of the level. controlled 540. * level teleport request is likely to be relativized to the 541. * status line, and consequently it should be incremented to 542. * the value of the logical depth of the target level. 543. * 544. * we let negative values requests fall into the "heaven" loop. 545. */ 546. if (In_quest(&u.uz) && newlev > 0) 547. newlev = newlev + dungeons[u.uz.dnum].depth_start - 1; 548. } else { /* involuntary level tele */ 549. random_levtport: 550. newlev = random_teleport_level(); 551. if (newlev == depth(&u.uz)) { 552. You(shudder_for_moment); 553. return; 554. } 555. } 556. 557. if (!next_to_u()) { 558. You(shudder_for_moment); 559. return; 560. } 561. #ifdef WIZARD 562. if (In_endgame(&u.uz)) { /* must already be wizard */ 563. int llimit = dunlevs_in_dungeon(&u.uz); 564. 565. if (newlev >= 0 || newlev <= -llimit) { 566. You_cant("get there from here."); 567. return; 568. } 569. newlevel.dnum = u.uz.dnum; 570. newlevel.dlevel = llimit + newlev; 571. schedule_goto(&newlevel, FALSE, FALSE, 0, (char *)0, (char *)0); 572. return; 573. } 574. #endif 575. 576. killer = 0; /* still alive, so far... */ 577. 578. if (newlev < 0) { 579. if (newlev <= -10) { 580. You("arrive in heaven."); 581. verbalize("Thou art early, but we'll admit thee."); 582. killer_format = NO_KILLER_PREFIX; 583. killer = "went to heaven prematurely"; 584. } else if (newlev == -9) { 585. You_feel("deliriously happy. "); 586. pline("(In fact, you're on Cloud 9!) "); 587. display_nhwindow(WIN_MESSAGE, FALSE); 588. } else 589. You("are now high above the clouds..."); 590. 591. if (killer) { 592. ; /* arrival in heaven is pending */ 593. } else if (Levitation) { 594. escape_by_flying = "float gently down to earth"; 595. } else if (Flying) { 596. escape_by_flying = "fly down to the ground"; 597. } else { 598. pline("Unfortunately, you don't know how to fly."); 599. You("plummet a few thousand feet to your death."); 600. killer_format = NO_KILLER_PREFIX; 601. killer = 602. self_pronoun("teleported out of the dungeon and fell to %s death","his"); 603. } 604. } 605. 606. if (killer) { /* the chosen destination was not survivable */ 607. /* set specific death location; this also suppresses bones */ 608. u.uz.dnum = 0; /* main dungeon */ 609. u.uz.dlevel = (newlev <= -10) ? -1 : 0; /* heaven or surface */ 610. done(DIED); 611. /* can only get here via life-saving (or declining to die in 612. explore|debug mode); the hero has now left the dungeon... */ 613. escape_by_flying = "find yourself back on the surface"; 614. } 615. 616. /* calls done(ESCAPED) if newlevel==0 */ 617. if (escape_by_flying) { 618. You("%s.", escape_by_flying); 619. newlevel.dnum = 0; /* specify main dungeon */ 620. newlevel.dlevel = 0; /* escape the dungeon */ 621. /* [dlevel used to be set to 1, but it doesn't make sense to 622. teleport out of the dungeon and float or fly down to the 623. surface but then actually arrive back inside the dungeon] */ 624. } else if (u.uz.dnum == medusa_level.dnum && 625. newlev >= dungeons[u.uz.dnum].depth_start + 626. dunlevs_in_dungeon(&u.uz)) { 627. find_hell(&newlevel); 628. } else { 629. /* if invocation did not yet occur, teleporting into 630. * the last level of Gehennom is forbidden. 631. */ 632. #ifdef WIZARD 633. if (!wizard) 634. #endif 635. if (Inhell && !u.uevent.invoked && 636. newlev >= (dungeons[u.uz.dnum].depth_start + 637. dunlevs_in_dungeon(&u.uz) - 1)) { 638. newlev = dungeons[u.uz.dnum].depth_start + 639. dunlevs_in_dungeon(&u.uz) - 2; 640. pline("Sorry..."); 641. } 642. /* no teleporting out of quest dungeon */ 643. if (In_quest(&u.uz) && newlev < depth(&qstart_level)) 644. newlev = depth(&qstart_level); 645. /* the player thinks of levels purely in logical terms, so 646. * we must translate newlev to a number relative to the 647. * current dungeon. 648. */ 649. get_level(&newlevel, newlev); 650. } 651. schedule_goto(&newlevel, FALSE, FALSE, 0, (char *)0, (char *)0); 652. /* in case player just read a scroll and is about to be asked to 653. call it something, we can't defer until the end of the turn */ 654. if (u.utotype && !flags.mon_moving) deferred_goto(); 655. } 656. 657. void 658. domagicportal(ttmp) 659. register struct trap *ttmp; 660. { 661. struct d_level target_level; 662. 663. if (!next_to_u()) { 664. You(shudder_for_moment); 665. return; 666. } 667. 668. /* if landed from another portal, do nothing */ 669. /* problem: level teleport landing escapes the check */ 670. if (!on_level(&u.uz, &u.uz0)) return; 671. 672. You("activated a magic portal!"); 673. 674. /* prevent the poor shnook, whose amulet was stolen while in 675. * the endgame, from accidently triggering the portal to the 676. * next level, and thus losing the game 677. */ 678. if (In_endgame(&u.uz) && !u.uhave.amulet) { 679. You_feel("dizzy for a moment, but nothing happens..."); 680. return; 681. } 682. 683. target_level = ttmp->dst; 684. schedule_goto(&target_level, FALSE, FALSE, 1, 685. "You feel dizzy for a moment, but the sensation passes.", 686. (char *)0); 687. } 688. 689. void 690. tele_trap(trap) 691. struct trap *trap; 692. { 693. if (In_endgame(&u.uz) || Antimagic) { 694. if (Antimagic) 695. shieldeff(u.ux, u.uy); 696. You_feel("a wrenching sensation."); 697. } else if (!next_to_u()) { 698. You(shudder_for_moment); 699. } else if (trap->once) { 700. deltrap(trap); 701. newsym(u.ux,u.uy); /* get rid of trap symbol */ 702. vault_tele(); 703. } else 704. tele(); 705. } 706. 707. void 708. level_tele_trap(trap) 709. struct trap *trap; 710. { 711. You("%s onto a level teleport trap!", 712. Levitation ? (const char *)"float" : 713. locomotion(youmonst.data, "step")); 714. if (Antimagic) { 715. shieldeff(u.ux, u.uy); 716. } 717. if (Antimagic || In_endgame(&u.uz)) { 718. You_feel("a wrenching sensation."); 719. return; 720. } 721. if (!Blind) 722. You("are momentarily blinded by a flash of light."); 723. else 724. You("are momentarily disoriented."); 725. deltrap(trap); 726. newsym(u.ux,u.uy); /* get rid of trap symbol */ 727. level_tele(); 728. } 729. 730. /* check whether monster can arrive at location via Tport (or fall) */ 731. STATIC_OVL boolean 732. rloc_pos_ok(x, y, mtmp) 733. register int x, y; /* coordinates of candidate location */ 734. struct monst *mtmp; 735. { 736. register int xx, yy; 737. 738. if (!goodpos(x, y, mtmp)) return FALSE; 739. /* 740. * Check for restricted areas present in some special levels. 741. * 742. * `xx' is current column; if 0, then `yy' will contain flag bits 743. * rather than row: bit #0 set => moving upwards; bit #1 set => 744. * inside the Wizard's tower. 745. */ 746. xx = mtmp->mx; 747. yy = mtmp->my; 748. if (!xx) { 749. /* no current location (migrating monster arrival) */ 750. if (dndest.nlx && On_W_tower_level(&u.uz)) 751. return ((yy & 2) != 0) ^ /* inside xor not within */ 752. !within_bounded_area(x, y, dndest.nlx, dndest.nly, 753. dndest.nhx, dndest.nhy); 754. if (updest.lx && (yy & 1) != 0) /* moving up */ 755. return (within_bounded_area(x, y, updest.lx, updest.ly, 756. updest.hx, updest.hy) && 757. (!updest.nlx || 758. !within_bounded_area(x, y, updest.nlx, updest.nly, 759. updest.nhx, updest.nhy))); 760. if (dndest.lx && (yy & 1) == 0) /* moving down */ 761. return (within_bounded_area(x, y, dndest.lx, dndest.ly, 762. dndest.hx, dndest.hy) && 763. (!dndest.nlx || 764. !within_bounded_area(x, y, dndest.nlx, dndest.nly, 765. dndest.nhx, dndest.nhy))); 766. } else { 767. /* current location is */ 768. if (!tele_jump_ok(xx, yy, x, y)) return FALSE; 769. } 770. /* is ok */ 771. return TRUE; 772. } 773. 774. /* 775. * rloc_to() 776. * 777. * Pulls a monster from its current position and places a monster at 778. * a new x and y. If oldx is 0, then the monster was not in the levels.monsters 779. * array. However, if oldx is 0, oldy may still have a value because mtmp is a 780. * migrating_mon. Worm tails are always placed randomly around the head of 781. * the worm. 782. */ 783. void 784. rloc_to(mtmp, x, y) 785. struct monst *mtmp; 786. register int x, y; 787. { 788. register int oldx = mtmp->mx, oldy = mtmp->my; 789. 790. if (x == mtmp->mx && y == mtmp->my) /* that was easy */ 791. return; 792. 793. if (oldx) { /* "pick up" monster */ 794. if (mtmp->wormno) 795. remove_worm(mtmp); 796. else { 797. remove_monster(oldx, oldy); 798. newsym(oldx, oldy); /* update old location */ 799. } 800. } 801. 802. place_monster(mtmp, x, y); /* put monster down */ 803. update_monster_region(mtmp); 804. 805. if (mtmp->wormno) /* now put down tail */ 806. place_worm_tail_randomly(mtmp, x, y); 807. 808. if (u.ustuck == mtmp) { 809. if (u.uswallow) { 810. u.ux = x; 811. u.uy = y; 812. docrt(); 813. } else u.ustuck = 0; 814. } 815. 816. newsym(x, y); /* update new location */ 817. set_apparxy(mtmp); /* orient monster */ 818. } 819. 820. /* place a monster at a random location, typically due to teleport */ 821. void 822. rloc(mtmp) 823. struct monst *mtmp; /* mx==0 implies migrating monster arrival */ 824. { 825. register int x, y, trycount; 826. xchar omx = mtmp->mx, omy = mtmp->my; 827. 828. if (mtmp->iswiz && omx) { /* Wizard, not just arriving */ 829. if (!In_W_tower(u.ux, u.uy, &u.uz)) 830. x = xupstair, y = yupstair; 831. else if (!xdnladder) /* bottom level of tower */ 832. x = xupladder, y = yupladder; 833. else 834. x = xdnladder, y = ydnladder; 835. /* if the wiz teleports away to heal, try the up staircase, 836. to block the player's escaping before he's healed 837. (deliberately use `goodpos' rather than `rloc_pos_ok' here) */ 838. if (goodpos(x, y, mtmp)) 839. goto found_xy; 840. } 841. 842. trycount = 0; 843. do { 844. x = rn1(COLNO-3,2); 845. y = rn2(ROWNO); 846. if ((trycount < 500) ? rloc_pos_ok(x, y, mtmp) 847. : goodpos(x, y, mtmp)) 848. goto found_xy; 849. } while (++trycount < 1000); 850. 851. /* last ditch attempt to find a good place */ 852. for (x = 2; x < COLNO - 1; x++) 853. for (y = 0; y < ROWNO; y++) 854. if (goodpos(x, y, mtmp)) 855. goto found_xy; 856. 857. /* level either full of monsters or somehow faulty */ 858. impossible("rloc(): couldn't relocate monster"); 859. return; 860. 861. found_xy: 862. rloc_to(mtmp, x, y); 863. /* shopkeepers will only teleport if you zap them with a wand of 864. teleportation or if they've been transformed into a jumpy monster; 865. the latter only happens if you've attacked them with polymorph */ 866. if (mtmp->isshk && !inhishop(mtmp)) make_angry_shk(mtmp, omx, omy); 867. } 868. 869. STATIC_OVL void 870. mvault_tele(mtmp) 871. struct monst *mtmp; 872. { 873. register struct mkroom *croom = search_special(VAULT); 874. coord c; 875. 876. if (croom && somexy(croom, &c) && 877. goodpos(c.x, c.y, mtmp)) { 878. rloc_to(mtmp, c.x, c.y); 879. return; 880. } 881. rloc(mtmp); 882. } 883. 884. boolean 885. tele_restrict(mon) 886. struct monst *mon; 887. { 888. if (level.flags.noteleport) { 889. if (canseemon(mon)) 890. pline("A mysterious force prevents %s from teleporting!", 891. mon_nam(mon)); 892. return TRUE; 893. } 894. return FALSE; 895. } 896. 897. void 898. mtele_trap(mtmp, trap, in_sight) 899. struct monst *mtmp; 900. struct trap *trap; 901. int in_sight; 902. { 903. char *monname; 904. 905. if (tele_restrict(mtmp)) return; 906. if (teleport_pet(mtmp, FALSE)) { 907. /* save name with pre-movement visibility */ 908. monname = Monnam(mtmp); 909. 910. /* Note: don't remove the trap if a vault. Other- 911. * wise the monster will be stuck there, since 912. * the guard isn't going to come for it... 913. */ 914. if (trap->once) mvault_tele(mtmp); 915. else rloc(mtmp); 916. 917. if (in_sight) { 918. if (canseemon(mtmp)) 919. pline("%s seems disoriented.", monname); 920. else 921. pline("%s suddenly disappears!", monname); 922. seetrap(trap); 923. } 924. } 925. } 926. 927. /* return 0 if still on level, 3 if not */ 928. int 929. mlevel_tele_trap(mtmp, trap, force_it, in_sight) 930. struct monst *mtmp; 931. struct trap *trap; 932. boolean force_it; 933. int in_sight; 934. { 935. int tt = trap->ttyp; 936. struct permonst *mptr = mtmp->data; 937. 938. if (mtmp == u.ustuck) /* probably a vortex */ 939. return 0; /* temporary? kludge */ 940. if (teleport_pet(mtmp, force_it)) { 941. d_level tolevel; 942. int migrate_typ = MIGR_RANDOM; 943. 944. if ((tt == HOLE || tt == TRAPDOOR)) { 945. if (Is_stronghold(&u.uz)) { 946. assign_level(&tolevel, &valley_level); 947. } else if (Is_botlevel(&u.uz)) { 948. if (in_sight && trap->tseen) 949. pline("%s avoids the %s.", Monnam(mtmp), 950. (tt == HOLE) ? "hole" : "trap"); 951. return 0; 952. } else { 953. get_level(&tolevel, depth(&u.uz) + 1); 954. } 955. } else if (tt == MAGIC_PORTAL) { 956. if (In_endgame(&u.uz) && 957. (mon_has_amulet(mtmp) || is_home_elemental(mptr))) { 958. if (in_sight && mptr->mlet != S_ELEMENTAL) { 959. pline("%s seems to shimmer for a moment.", 960. Monnam(mtmp)); 961. seetrap(trap); 962. } 963. return 0; 964. } else { 965. assign_level(&tolevel, &trap->dst); 966. migrate_typ = MIGR_PORTAL; 967. } 968. } else { /* (tt == LEVEL_TELEP) */ 969. int nlev; 970. 971. if (mon_has_amulet(mtmp) || In_endgame(&u.uz)) { 972. if (in_sight) 973. pline("%s seems very disoriented for a moment.", 974. Monnam(mtmp)); 975. return 0; 976. } 977. nlev = random_teleport_level(); 978. if (nlev == depth(&u.uz)) { 979. if (in_sight) 980. pline("%s shudders for a moment.", Monnam(mtmp)); 981. return 0; 982. } 983. get_level(&tolevel, nlev); 984. } 985. 986. if (in_sight) { 987. pline("Suddenly, %s disappears out of sight.", mon_nam(mtmp)); 988. seetrap(trap); 989. } 990. migrate_to_level(mtmp, ledger_no(&tolevel), 991. migrate_typ, (coord *)0); 992. return 3; /* no longer on this level */ 993. } 994. return 0; 995. } 996. 997. 998. void 999. rloco(obj) 1000. register struct obj *obj; 1001. { 1002. register xchar tx, ty, otx, oty; 1003. boolean restricted_fall; 1004. int try_limit = 4000; 1005. 1006. obj_extract_self(obj); 1007. otx = obj->ox; 1008. oty = obj->oy; 1009. restricted_fall = (otx == 0 && dndest.lx); 1010. do { 1011. tx = rn1(COLNO-3,2); 1012. ty = rn2(ROWNO); 1013. if (!--try_limit) break; 1014. } while (!goodpos(tx, ty, (struct monst *)0) || 1015. /* bug: this lacks provision for handling the Wizard's tower */ 1016. (restricted_fall && 1017. (!within_bounded_area(tx, ty, dndest.lx, dndest.ly, 1018. dndest.hx, dndest.hy) || 1019. (dndest.nlx && 1020. within_bounded_area(tx, ty, dndest.nlx, dndest.nly, 1021. dndest.nhx, dndest.nhy))))); 1022. 1023. if (flooreffects(obj, tx, ty, "fall")) { 1024. return; 1025. } else if (otx == 0 && oty == 0) { 1026. ; /* fell through a trapdoor; no update of old loc needed */ 1027. } else { 1028. if (costly_spot(otx, oty) 1029. && (!costly_spot(tx, ty) || 1030. !index(in_rooms(tx, ty, 0), *in_rooms(otx, oty, 0)))) { 1031. if (costly_spot(u.ux, u.uy) && 1032. index(u.urooms, *in_rooms(otx, oty, 0))) 1033. addtobill(obj, FALSE, FALSE, FALSE); 1034. else (void)stolen_value(obj, otx, oty, FALSE, FALSE); 1035. } 1036. newsym(otx, oty); /* update old location */ 1037. } 1038. place_object(obj, tx, ty); 1039. newsym(tx, ty); 1040. } 1041. 1042. /* Returns an absolute depth */ 1043. int 1044. random_teleport_level() 1045. { 1046. int nlev, max_depth, min_depth; 1047. 1048. if (!rn2(5) || Is_knox(&u.uz)) 1049. return (int)depth(&u.uz); 1050. 1051. /* Get a random value relative to the current dungeon */ 1052. /* Range is 1 to current+3, current not counting */ 1053. nlev = rnd((int)depth(&u.uz) + 2); 1054. if (nlev >= (int)depth(&u.uz)) nlev++; 1055. 1056. /* What I really want to do is as follows: 1057. * -- If in a dungeon that goes down, the new level is to be restricted 1058. * to [top of parent, bottom of current dungeon] 1059. * -- If in a dungeon that goes up, the new level is to be restricted 1060. * to [top of current dungeon, bottom of parent] 1061. * -- If in a quest dungeon or similar dungeon entered by portals, 1062. * the new level is to be restricted to [top of current dungeon, 1063. * bottom of current dungeon] 1064. * The current behavior is not as sophisticated as that ideal, but is 1065. * still better what we used to do, which was like this for players 1066. * but different for monsters for no obvious reason. Currently, we 1067. * must explicitly check for special dungeons. We check for Knox 1068. * above; endgame is handled in the caller due to its different 1069. * message ("disoriented"). 1070. * --KAA 1071. */ 1072. min_depth = 1; 1073. max_depth = dunlevs_in_dungeon(&u.uz) + 1074. (dungeons[u.uz.dnum].depth_start - 1); 1075. 1076. if (nlev > max_depth) { 1077. nlev = max_depth; 1078. /* teleport up if already on bottom */ 1079. if (Is_botlevel(&u.uz)) nlev -= rnd(3); 1080. } 1081. if (nlev < min_depth) { 1082. nlev = min_depth; 1083. if ((int)depth(&u.uz) == min_depth) { 1084. nlev += rnd(3); 1085. if (nlev > max_depth) 1086. nlev = max_depth; 1087. } 1088. } 1089. return nlev; 1090. } 1091. 1092. /* you teleport a monster (via wand, spell, or poly'd q.mechanic attack); 1093. return false iff the attempt fails */ 1094. boolean 1095. u_teleport_mon(mtmp, give_feedback) 1096. struct monst *mtmp; 1097. boolean give_feedback; 1098. { 1099. coord cc; 1100. 1101. if (mtmp->ispriest && *in_rooms(mtmp->mx, mtmp->my, TEMPLE)) { 1102. if (give_feedback) 1103. pline("%s resists your magic!", Monnam(mtmp)); 1104. return FALSE; 1105. } else { 1106. if (is_rider(mtmp->data) && rn2(13) && 1107. enexto(&cc, u.ux, u.uy, mtmp->data)) 1108. rloc_to(mtmp, cc.x, cc.y); 1109. else 1110. rloc(mtmp); 1111. return TRUE; 1112. } 1113. } 1114. 1115. /*teleport.c*/
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