src/floor-streams.c

   1 /*!
   2  * @file streams.c
   3  * @brief ダンジョン生成に利用する関数群 / Used by dungeon generation.
   4  * @date 2014/07/15
   5  * @author
   6  * <pre>
   7  * Copyright (c) 1997 Ben Harrison, James E. Wilson, Robert A. Koeneke
   8  * This software may be copied and distributed for educational, research,
   9  * and not for profit purposes provided that this copyright and statement
  10  * are included in all such copies.  Other copyrights may also apply.
  11  * </pre>
  12  * @details
  13  * Purpose:  This file holds all the
  14  * functions that are applied to a level after the rest has been
  15  * generated, ie streams and level destruction.
  16  */
  17
  18 #include "angband.h"
  19 #include "util.h"
  20
  21 #include "artifact.h"
  22 #include "floor-generate.h"
  23 #include "floor.h"
  24 #include "floor-streams.h"
  25 #include "grid.h"
  26 #include "monster.h"
  27 #include "feature.h"
  28 #include "object-flavor.h"
  29 #include "object-hook.h"
  30
  31
  32 /*!
  33  * @brief 再帰フラクタルアルゴリズムによりダンジョン内に川を配置する /
  34  * Recursive fractal algorithm to place water through the dungeon.
  35  * @param x1 起点x座標
  36  * @param y1 起点y座標
  37  * @param x2 終点x座標
  38  * @param y2 終点y座標
  39  * @param feat1 中央部地形ID
  40  * @param feat2 境界部地形ID
  41  * @param width 基本幅
  42  * @return なし
  43  */
  44 static void recursive_river(POSITION x1, POSITION y1, POSITION x2, POSITION y2, FEAT_IDX feat1, FEAT_IDX feat2, POSITION width)
  45 {
  46         POSITION dx, dy, length, l, x, y;
  47         POSITION changex, changey;
  48         POSITION ty, tx;
  49         bool done;
  50         grid_type *g_ptr;
  51
  52         length = distance(x1, y1, x2, y2);
  53
  54         if (length > 4)
  55         {
  56                 /*
  57                  * Divide path in half and call routine twice.
  58                  * There is a small chance of splitting the river
  59                  */
  60                 dx = (x2 - x1) / 2;
  61                 dy = (y2 - y1) / 2;
  62
  63                 if (dy != 0)
  64                 {
  65                         /* perturbation perpendicular to path */
  66                         changex = randint1(abs(dy)) * 2 - abs(dy);
  67                 }
  68                 else
  69                 {
  70                         changex = 0;
  71                 }
  72
  73                 if (dx != 0)
  74                 {
  75                         /* perturbation perpendicular to path */
  76                         changey = randint1(abs(dx)) * 2 - abs(dx);
  77                 }
  78                 else
  79                 {
  80                         changey = 0;
  81                 }
  82
  83                 if (!in_bounds(y1 + dy + changey, x1 + dx + changex))
  84                 {
  85                         changex = 0;
  86                         changey = 0;
  87                 }
  88
  89                 /* construct river out of two smaller ones */
  90                 recursive_river(x1, y1, x1 + dx + changex, y1 + dy + changey, feat1, feat2, width);
  91                 recursive_river(x1 + dx + changex, y1 + dy + changey, x2, y2, feat1, feat2, width);
  92
  93                 /* Split the river some of the time - junctions look cool */
  94                 if (one_in_(DUN_WAT_CHG) && (width > 0))
  95                 {
  96                         recursive_river(x1 + dx + changex, y1 + dy + changey,
  97                                         x1 + 8 * (dx + changex), y1 + 8 * (dy + changey),
  98                                         feat1, feat2, width - 1);
  99                 }
 100         }
 101         else
 102         {
 103                 /* Actually build the river */
 104                 for (l = 0; l < length; l++)
 105                 {
 106                         x = x1 + l * (x2 - x1) / length;
 107                         y = y1 + l * (y2 - y1) / length;
 108
 109                         done = FALSE;
 110
 111                         while (!done)
 112                         {
 113                                 for (ty = y - width - 1; ty <= y + width + 1; ty++)
 114                                 {
 115                                         for (tx = x - width - 1; tx <= x + width + 1; tx++)
 116                                         {
 117                                                 if (!in_bounds2(ty, tx)) continue;
 118
 119                                                 g_ptr = &current_floor_ptr->grid_array[ty][tx];
 120
 121                                                 if (g_ptr->feat == feat1) continue;
 122                                                 if (g_ptr->feat == feat2) continue;
 123
 124                                                 if (distance(ty, tx, y, x) > rand_spread(width, 1)) continue;
 125
 126                                                 /* Do not convert permanent features */
 127                                                 if (cave_perma_grid(g_ptr)) continue;
 128
 129                                                 /*
 130                                                  * Clear previous contents, add feature
 131                                                  * The border mainly gets feat2, while the center gets feat1
 132                                                  */
 133                                                 if (distance(ty, tx, y, x) > width)
 134                                                         g_ptr->feat = feat2;
 135                                                 else
 136                                                         g_ptr->feat = feat1;
 137
 138                                                 /* Clear garbage of hidden trap or door */
 139                                                 g_ptr->mimic = 0;
 140
 141                                                 /* Lava terrain glows */
 142                                                 if (have_flag(f_info[feat1].flags, FF_LAVA))
 143                                                 {
 144                                                         if (!(d_info[p_ptr->dungeon_idx].flags1 & DF1_DARKNESS)) g_ptr->info |= CAVE_GLOW;
 145                                                 }
 146
 147                                                 /* Hack -- don't teleport here */
 148                                                 g_ptr->info |= CAVE_ICKY;
 149                                         }
 150                                 }
 151
 152                                 done = TRUE;
 153                         }
 154                 }
 155         }
 156 }
 157
 158
 159 /*!
 160  * @brief ランダムに川/溶岩流をダンジョンに配置する /
 161  * Places water /lava through dungeon.
 162  * @param feat1 中央部地形ID
 163  * @param feat2 境界部地形ID
 164  * @return なし
 165  */
 166 void add_river(FEAT_IDX feat1, FEAT_IDX feat2)
 167 {
 168         POSITION y2, x2;
 169         POSITION y1 = 0, x1 = 0;
 170         POSITION wid;
 171
 172
 173         /* Hack -- Choose starting point */
 174         y2 = randint1(current_floor_ptr->height / 2 - 2) + current_floor_ptr->height / 2;
 175         x2 = randint1(current_floor_ptr->width / 2 - 2) + current_floor_ptr->width / 2;
 176
 177         /* Hack -- Choose ending point somewhere on boundary */
 178         switch(randint1(4))
 179         {
 180                 case 1:
 181                 {
 182                         /* top boundary */
 183                         x1 = randint1(current_floor_ptr->width-2)+1;
 184                         y1 = 1;
 185                         break;
 186                 }
 187                 case 2:
 188                 {
 189                         /* left boundary */
 190                         x1 = 1;
 191                         y1 = randint1(current_floor_ptr->height-2)+1;
 192                         break;
 193                 }
 194                 case 3:
 195                 {
 196                         /* right boundary */
 197                         x1 = current_floor_ptr->width-1;
 198                         y1 = randint1(current_floor_ptr->height-2)+1;
 199                         break;
 200                 }
 201                 case 4:
 202                 {
 203                         /* bottom boundary */
 204                         x1 = randint1(current_floor_ptr->width-2)+1;
 205                         y1 = current_floor_ptr->height-1;
 206                         break;
 207                 }
 208         }
 209
 210         wid = randint1(DUN_WAT_RNG);
 211         recursive_river(x1, y1, x2, y2, feat1, feat2, wid);
 212
 213         /* Hack - Save the location as a "room" */
 214         if (dun->cent_n < CENT_MAX)
 215         {
 216                 dun->cent[dun->cent_n].y = y2;
 217                 dun->cent[dun->cent_n].x = x2;
 218                 dun->cent_n++;
 219         }
 220 }
 221
 222
 223 /*!
 224  * @brief ダンジョンの壁部にストリーマー（地質の変化）を与える /
 225  * Places "streamers" of rock through dungeon
 226  * @param feat ストリーマー地形ID
 227  * @param chance 生成密度
 228  * @return なし
 229  * @details
 230  * <pre>
 231  * Note that their are actually six different terrain features used
 232  * to represent streamers.  Three each of magma and quartz, one for
 233  * basic vein, one with hidden gold, and one with known gold.  The
 234  * hidden gold types are currently unused.
 235  * </pre>
 236  */
 237 void build_streamer(FEAT_IDX feat, int chance)
 238 {
 239         int i;
 240         POSITION y, x, tx, ty;
 241         DIRECTION dir;
 242         int dummy = 0;
 243
 244         grid_type *g_ptr;
 245         feature_type *f_ptr;
 246
 247         feature_type *streamer_ptr = &f_info[feat];
 248         bool streamer_is_wall = have_flag(streamer_ptr->flags, FF_WALL) && !have_flag(streamer_ptr->flags, FF_PERMANENT);
 249         bool streamer_may_have_gold = have_flag(streamer_ptr->flags, FF_MAY_HAVE_GOLD);
 250
 251         /* Hack -- Choose starting point */
 252         y = rand_spread(current_floor_ptr->height / 2, current_floor_ptr->height / 6);
 253         x = rand_spread(current_floor_ptr->width / 2, current_floor_ptr->width / 6);
 254
 255         /* Choose a random compass direction */
 256         dir = randint0(8);
 257
 258         /* Place streamer into dungeon */
 259         while (dummy < SAFE_MAX_ATTEMPTS)
 260         {
 261                 dummy++;
 262
 263                 /* One grid per density */
 264                 for (i = 0; i < DUN_STR_DEN; i++)
 265                 {
 266                         int d = DUN_STR_RNG;
 267
 268                         /* Pick a nearby grid */
 269                         while (1)
 270                         {
 271                                 ty = rand_spread(y, d);
 272                                 tx = rand_spread(x, d);
 273                                 if (!in_bounds2(ty, tx)) continue;
 274                                 break;
 275                         }
 276                         g_ptr = &current_floor_ptr->grid_array[ty][tx];
 277                         f_ptr = &f_info[g_ptr->feat];
 278
 279                         if (have_flag(f_ptr->flags, FF_MOVE) && (have_flag(f_ptr->flags, FF_WATER) || have_flag(f_ptr->flags, FF_LAVA)))
 280                                 continue;
 281
 282                         /* Do not convert permanent features */
 283                         if (have_flag(f_ptr->flags, FF_PERMANENT)) continue;
 284
 285                         /* Only convert "granite" walls */
 286                         if (streamer_is_wall)
 287                         {
 288                                 if (!is_extra_grid(g_ptr) && !is_inner_grid(g_ptr) && !is_outer_grid(g_ptr) && !is_solid_grid(g_ptr)) continue;
 289                                 if (is_closed_door(g_ptr->feat)) continue;
 290                         }
 291
 292                         if (g_ptr->m_idx && !(have_flag(streamer_ptr->flags, FF_PLACE) && monster_can_cross_terrain(feat, &r_info[current_floor_ptr->m_list[g_ptr->m_idx].r_idx], 0)))
 293                         {
 294                                 /* Delete the monster (if any) */
 295                                 delete_monster(ty, tx);
 296                         }
 297
 298                         if (g_ptr->o_idx && !have_flag(streamer_ptr->flags, FF_DROP))
 299                         {
 300                                 OBJECT_IDX this_o_idx, next_o_idx = 0;
 301
 302                                 /* Scan all objects in the grid */
 303                                 for (this_o_idx = g_ptr->o_idx; this_o_idx; this_o_idx = next_o_idx)
 304                                 {
 305                                         object_type *o_ptr = &current_floor_ptr->o_list[this_o_idx];
 306                                         next_o_idx = o_ptr->next_o_idx;
 307
 308                                         /* Hack -- Preserve unknown artifacts */
 309                                         if (object_is_fixed_artifact(o_ptr))
 310                                         {
 311                                                 /* Mega-Hack -- Preserve the artifact */
 312                                                 a_info[o_ptr->name1].cur_num = 0;
 313
 314                                                 if (cheat_peek)
 315                                                 {
 316                                                         GAME_TEXT o_name[MAX_NLEN];
 317                                                         object_desc(o_name, o_ptr, (OD_NAME_ONLY | OD_STORE));
 318                                                         msg_format(_("伝説のアイテム (%s) はストリーマーにより削除された。",
 319                                                                 "Artifact (%s) was deleted by streamer."), o_name);
 320                                                 }
 321                                         }
 322                                         else if (cheat_peek && o_ptr->art_name)
 323                                         {
 324                                                 msg_print(_("ランダム・アーティファクトの1つはストリーマーにより削除された。",
 325                                                         "One of the random artifacts was deleted by streamer."));
 326                                         }
 327                                 }
 328
 329                                 delete_object(ty, tx);
 330                         }
 331
 332                         /* Clear previous contents, add proper vein type */
 333                         g_ptr->feat = feat;
 334
 335                         /* Paranoia: Clear mimic field */
 336                         g_ptr->mimic = 0;
 337
 338                         if (streamer_may_have_gold)
 339                         {
 340                                 /* Hack -- Add some known treasure */
 341                                 if (one_in_(chance))
 342                                 {
 343                                         cave_alter_feat(ty, tx, FF_MAY_HAVE_GOLD);
 344                                 }
 345
 346                                 /* Hack -- Add some hidden treasure */
 347                                 else if (one_in_(chance / 4))
 348                                 {
 349                                         cave_alter_feat(ty, tx, FF_MAY_HAVE_GOLD);
 350                                         cave_alter_feat(ty, tx, FF_ENSECRET);
 351                                 }
 352                         }
 353                 }
 354
 355                 if (dummy >= SAFE_MAX_ATTEMPTS)
 356                 {
 357                         msg_print_wizard(CHEAT_DUNGEON, _("地形のストリーマー処理に失敗しました。", "Failed to place streamer."));
 358                         return;
 359                 }
 360
 361                 /* Advance the streamer */
 362                 y += ddy[cdd[dir]];
 363                 x += ddx[cdd[dir]];
 364
 365                 if(one_in_(10))
 366                 {
 367                         if(one_in_(2)) dir = (dir + 1) % 8;
 368                         else dir = (dir > 0) ? dir - 1 : 7;
 369                 }
 370
 371                 /* Quit before leaving the dungeon */
 372                 if (!in_bounds(y, x)) break;
 373         }
 374 }
 375
 376
 377 /*!
 378  * @brief ダンジョンの指定位置近辺に森林を配置する /
 379  * Places "streamers" of rock through dungeon
 380  * @param x 指定X座標
 381  * @param y 指定Y座標
 382  * @return なし
 383  * @details
 384  * <pre>
 385  * Put trees near a hole in the dungeon roof  (rubble on ground + up stairway)
 386  * This happens in real world lava tubes.
 387  * </pre>
 388  */
 389 void place_trees(POSITION x, POSITION y)
 390 {
 391         int i, j;
 392         grid_type *g_ptr;
 393
 394         /* place trees/ rubble in ovalish distribution */
 395         for (i = x - 3; i < x + 4; i++)
 396         {
 397                 for (j = y - 3; j < y + 4; j++)
 398                 {
 399                         if (!in_bounds(j, i)) continue;
 400                         g_ptr = &current_floor_ptr->grid_array[j][i];
 401
 402                         if (g_ptr->info & CAVE_ICKY) continue;
 403                         if (g_ptr->o_idx) continue;
 404
 405                         /* Want square to be in the circle and accessable. */
 406                         if ((distance(j, i, y, x) < 4) && !cave_perma_grid(g_ptr))
 407                         {
 408                                 /*
 409                                  * Clear previous contents, add feature
 410                                  * The border mainly gets trees, while the center gets rubble
 411                                  */
 412                                 if ((distance(j, i, y, x) > 1) || (randint1(100) < 25))
 413                                 {
 414                                         if (randint1(100) < 75)
 415                                                 current_floor_ptr->grid_array[j][i].feat = feat_tree;
 416                                 }
 417                                 else
 418                                 {
 419                                         current_floor_ptr->grid_array[j][i].feat = feat_rubble;
 420                                 }
 421
 422                                 /* Clear garbage of hidden trap or door */
 423                                 g_ptr->mimic = 0;
 424
 425                                 /* Light area since is open above */
 426                                 if (!(d_info[p_ptr->dungeon_idx].flags1 & DF1_DARKNESS)) current_floor_ptr->grid_array[j][i].info |= (CAVE_GLOW | CAVE_ROOM);
 427                         }
 428                 }
 429         }
 430
 431         /* No up stairs in ironman mode */
 432         if (!ironman_downward && one_in_(3))
 433         {
 434                 /* up stair */
 435                 current_floor_ptr->grid_array[y][x].feat = feat_up_stair;
 436         }
 437 }
 438
 439
 440 /*!
 441  * @brief ダンジョンに＊破壊＊済み地形ランダムに施す /
 442  * Build a destroyed level
 443  * @return なし
 444  */
 445 void destroy_level(void)
 446 {
 447         POSITION y1, x1;
 448         int n;
 449
 450         /* Note destroyed levels */
 451         msg_print_wizard(CHEAT_DUNGEON, _("階に*破壊*の痕跡を生成しました。", "Destroyed Level."));
 452
 453         /* Drop a few epi-centers (usually about two) */
 454         for (n = 0; n < randint1(5); n++)
 455         {
 456                 /* Pick an epi-center */
 457                 x1 = rand_range(5, current_floor_ptr->width - 1 - 5);
 458                 y1 = rand_range(5, current_floor_ptr->height - 1 - 5);
 459
 460                 (void)destroy_area(y1, x1, 15, TRUE);
 461         }
 462 }