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 "dungeon.h"
  24 #include "floor.h"
  25 #include "floor-streams.h"
  26 #include "grid.h"
  27 #include "monster.h"
  28 #include "feature.h"
  29 #include "object-flavor.h"
  30 #include "object-hook.h"
  31 #include "spells.h"
  32
  33
  34 /*!
  35  * @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 /
  36  * Recursive fractal algorithm to place water through the dungeon.
  37  * @param x1 起点x座標
  38  * @param y1 起点y座標
  39  * @param x2 終点x座標
  40  * @param y2 終点y座標
  41  * @param feat1 中央部地形ID
  42  * @param feat2 境界部地形ID
  43  * @param width 基本幅
  44  * @return なし
  45  */
  46 static void recursive_river(POSITION x1, POSITION y1, POSITION x2, POSITION y2, FEAT_IDX feat1, FEAT_IDX feat2, POSITION width)
  47 {
  48         POSITION dx, dy, length, l, x, y;
  49         POSITION changex, changey;
  50         POSITION ty, tx;
  51         bool done;
  52         grid_type *g_ptr;
  53
  54         length = distance(x1, y1, x2, y2);
  55
  56         if (length > 4)
  57         {
  58                 /*
  59                  * Divide path in half and call routine twice.
  60                  * There is a small chance of splitting the river
  61                  */
  62                 dx = (x2 - x1) / 2;
  63                 dy = (y2 - y1) / 2;
  64
  65                 if (dy != 0)
  66                 {
  67                         /* perturbation perpendicular to path */
  68                         changex = randint1(abs(dy)) * 2 - abs(dy);
  69                 }
  70                 else
  71                 {
  72                         changex = 0;
  73                 }
  74
  75                 if (dx != 0)
  76                 {
  77                         /* perturbation perpendicular to path */
  78                         changey = randint1(abs(dx)) * 2 - abs(dx);
  79                 }
  80                 else
  81                 {
  82                         changey = 0;
  83                 }
  84
  85                 if (!in_bounds(y1 + dy + changey, x1 + dx + changex))
  86                 {
  87                         changex = 0;
  88                         changey = 0;
  89                 }
  90
  91                 /* construct river out of two smaller ones */
  92                 recursive_river(x1, y1, x1 + dx + changex, y1 + dy + changey, feat1, feat2, width);
  93                 recursive_river(x1 + dx + changex, y1 + dy + changey, x2, y2, feat1, feat2, width);
  94
  95                 /* Split the river some of the time - junctions look cool */
  96                 if (one_in_(DUN_WAT_CHG) && (width > 0))
  97                 {
  98                         recursive_river(x1 + dx + changex, y1 + dy + changey,
  99                                         x1 + 8 * (dx + changex), y1 + 8 * (dy + changey),
 100                                         feat1, feat2, width - 1);
 101                 }
 102         }
 103         else
 104         {
 105                 /* Actually build the river */
 106                 for (l = 0; l < length; l++)
 107                 {
 108                         x = x1 + l * (x2 - x1) / length;
 109                         y = y1 + l * (y2 - y1) / length;
 110
 111                         done = FALSE;
 112
 113                         while (!done)
 114                         {
 115                                 for (ty = y - width - 1; ty <= y + width + 1; ty++)
 116                                 {
 117                                         for (tx = x - width - 1; tx <= x + width + 1; tx++)
 118                                         {
 119                                                 if (!in_bounds2(ty, tx)) continue;
 120
 121                                                 g_ptr = &current_floor_ptr->grid_array[ty][tx];
 122
 123                                                 if (g_ptr->feat == feat1) continue;
 124                                                 if (g_ptr->feat == feat2) continue;
 125
 126                                                 if (distance(ty, tx, y, x) > rand_spread(width, 1)) continue;
 127
 128                                                 /* Do not convert permanent features */
 129                                                 if (cave_perma_grid(g_ptr)) continue;
 130
 131                                                 /*
 132                                                  * Clear previous contents, add feature
 133                                                  * The border mainly gets feat2, while the center gets feat1
 134                                                  */
 135                                                 if (distance(ty, tx, y, x) > width)
 136                                                         g_ptr->feat = feat2;
 137                                                 else
 138                                                         g_ptr->feat = feat1;
 139
 140                                                 /* Clear garbage of hidden trap or door */
 141                                                 g_ptr->mimic = 0;
 142
 143                                                 /* Lava terrain glows */
 144                                                 if (have_flag(f_info[feat1].flags, FF_LAVA))
 145                                                 {
 146                                                         if (!(d_info[p_ptr->dungeon_idx].flags1 & DF1_DARKNESS)) g_ptr->info |= CAVE_GLOW;
 147                                                 }
 148
 149                                                 /* Hack -- don't teleport here */
 150                                                 g_ptr->info |= CAVE_ICKY;
 151                                         }
 152                                 }
 153
 154                                 done = TRUE;
 155                         }
 156                 }
 157         }
 158 }
 159
 160
 161 /*!
 162  * @brief ランダムに川/溶岩流をダンジョンに配置する /
 163  * Places water /lava through dungeon.
 164  * @param feat1 中央部地形ID
 165  * @param feat2 境界部地形ID
 166  * @return なし
 167  */
 168 void add_river(FEAT_IDX feat1, FEAT_IDX feat2)
 169 {
 170         POSITION y2, x2;
 171         POSITION y1 = 0, x1 = 0;
 172         POSITION wid;
 173
 174
 175         /* Hack -- Choose starting point */
 176         y2 = randint1(current_floor_ptr->height / 2 - 2) + current_floor_ptr->height / 2;
 177         x2 = randint1(current_floor_ptr->width / 2 - 2) + current_floor_ptr->width / 2;
 178
 179         /* Hack -- Choose ending point somewhere on boundary */
 180         switch(randint1(4))
 181         {
 182                 case 1:
 183                 {
 184                         /* top boundary */
 185                         x1 = randint1(current_floor_ptr->width-2)+1;
 186                         y1 = 1;
 187                         break;
 188                 }
 189                 case 2:
 190                 {
 191                         /* left boundary */
 192                         x1 = 1;
 193                         y1 = randint1(current_floor_ptr->height-2)+1;
 194                         break;
 195                 }
 196                 case 3:
 197                 {
 198                         /* right boundary */
 199                         x1 = current_floor_ptr->width-1;
 200                         y1 = randint1(current_floor_ptr->height-2)+1;
 201                         break;
 202                 }
 203                 case 4:
 204                 {
 205                         /* bottom boundary */
 206                         x1 = randint1(current_floor_ptr->width-2)+1;
 207                         y1 = current_floor_ptr->height-1;
 208                         break;
 209                 }
 210         }
 211
 212         wid = randint1(DUN_WAT_RNG);
 213         recursive_river(x1, y1, x2, y2, feat1, feat2, wid);
 214
 215         /* Hack - Save the location as a "room" */
 216         if (dun->cent_n < CENT_MAX)
 217         {
 218                 dun->cent[dun->cent_n].y = y2;
 219                 dun->cent[dun->cent_n].x = x2;
 220                 dun->cent_n++;
 221         }
 222 }
 223
 224
 225 /*!
 226  * @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 /
 227  * Places "streamers" of rock through dungeon
 228  * @param feat ストリーマー地形ID
 229  * @param chance 生成密度
 230  * @return なし
 231  * @details
 232  * <pre>
 233  * Note that their are actually six different terrain features used
 234  * to represent streamers.  Three each of magma and quartz, one for
 235  * basic vein, one with hidden gold, and one with known gold.  The
 236  * hidden gold types are currently unused.
 237  * </pre>
 238  */
 239 void build_streamer(FEAT_IDX feat, int chance)
 240 {
 241         int i;
 242         POSITION y, x, tx, ty;
 243         DIRECTION dir;
 244         int dummy = 0;
 245
 246         grid_type *g_ptr;
 247         feature_type *f_ptr;
 248
 249         feature_type *streamer_ptr = &f_info[feat];
 250         bool streamer_is_wall = have_flag(streamer_ptr->flags, FF_WALL) && !have_flag(streamer_ptr->flags, FF_PERMANENT);
 251         bool streamer_may_have_gold = have_flag(streamer_ptr->flags, FF_MAY_HAVE_GOLD);
 252
 253         /* Hack -- Choose starting point */
 254         y = rand_spread(current_floor_ptr->height / 2, current_floor_ptr->height / 6);
 255         x = rand_spread(current_floor_ptr->width / 2, current_floor_ptr->width / 6);
 256
 257         /* Choose a random compass direction */
 258         dir = randint0(8);
 259
 260         /* Place streamer into dungeon */
 261         while (dummy < SAFE_MAX_ATTEMPTS)
 262         {
 263                 dummy++;
 264
 265                 /* One grid per density */
 266                 for (i = 0; i < DUN_STR_DEN; i++)
 267                 {
 268                         int d = DUN_STR_RNG;
 269
 270                         /* Pick a nearby grid */
 271                         while (1)
 272                         {
 273                                 ty = rand_spread(y, d);
 274                                 tx = rand_spread(x, d);
 275                                 if (!in_bounds2(ty, tx)) continue;
 276                                 break;
 277                         }
 278                         g_ptr = &current_floor_ptr->grid_array[ty][tx];
 279                         f_ptr = &f_info[g_ptr->feat];
 280
 281                         if (have_flag(f_ptr->flags, FF_MOVE) && (have_flag(f_ptr->flags, FF_WATER) || have_flag(f_ptr->flags, FF_LAVA)))
 282                                 continue;
 283
 284                         /* Do not convert permanent features */
 285                         if (have_flag(f_ptr->flags, FF_PERMANENT)) continue;
 286
 287                         /* Only convert "granite" walls */
 288                         if (streamer_is_wall)
 289                         {
 290                                 if (!is_extra_grid(g_ptr) && !is_inner_grid(g_ptr) && !is_outer_grid(g_ptr) && !is_solid_grid(g_ptr)) continue;
 291                                 if (is_closed_door(g_ptr->feat)) continue;
 292                         }
 293
 294                         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)))
 295                         {
 296                                 /* Delete the monster (if any) */
 297                                 delete_monster(ty, tx);
 298                         }
 299
 300                         if (g_ptr->o_idx && !have_flag(streamer_ptr->flags, FF_DROP))
 301                         {
 302                                 OBJECT_IDX this_o_idx, next_o_idx = 0;
 303
 304                                 /* Scan all objects in the grid */
 305                                 for (this_o_idx = g_ptr->o_idx; this_o_idx; this_o_idx = next_o_idx)
 306                                 {
 307                                         object_type *o_ptr = &current_floor_ptr->o_list[this_o_idx];
 308                                         next_o_idx = o_ptr->next_o_idx;
 309
 310                                         /* Hack -- Preserve unknown artifacts */
 311                                         if (object_is_fixed_artifact(o_ptr))
 312                                         {
 313                                                 /* Mega-Hack -- Preserve the artifact */
 314                                                 a_info[o_ptr->name1].cur_num = 0;
 315
 316                                                 if (cheat_peek)
 317                                                 {
 318                                                         GAME_TEXT o_name[MAX_NLEN];
 319                                                         object_desc(o_name, o_ptr, (OD_NAME_ONLY | OD_STORE));
 320                                                         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。",
 321                                                                 "Artifact (%s) was deleted by streamer."), o_name);
 322                                                 }
 323                                         }
 324                                         else if (cheat_peek && o_ptr->art_name)
 325                                         {
 326                                                 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。",
 327                                                         "One of the random artifacts was deleted by streamer."));
 328                                         }
 329                                 }
 330
 331                                 delete_object(ty, tx);
 332                         }
 333
 334                         /* Clear previous contents, add proper vein type */
 335                         g_ptr->feat = feat;
 336
 337                         /* Paranoia: Clear mimic field */
 338                         g_ptr->mimic = 0;
 339
 340                         if (streamer_may_have_gold)
 341                         {
 342                                 /* Hack -- Add some known treasure */
 343                                 if (one_in_(chance))
 344                                 {
 345                                         cave_alter_feat(ty, tx, FF_MAY_HAVE_GOLD);
 346                                 }
 347
 348                                 /* Hack -- Add some hidden treasure */
 349                                 else if (one_in_(chance / 4))
 350                                 {
 351                                         cave_alter_feat(ty, tx, FF_MAY_HAVE_GOLD);
 352                                         cave_alter_feat(ty, tx, FF_ENSECRET);
 353                                 }
 354                         }
 355                 }
 356
 357                 if (dummy >= SAFE_MAX_ATTEMPTS)
 358                 {
 359                         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."));
 360                         return;
 361                 }
 362
 363                 /* Advance the streamer */
 364                 y += ddy[cdd[dir]];
 365                 x += ddx[cdd[dir]];
 366
 367                 if(one_in_(10))
 368                 {
 369                         if(one_in_(2)) dir = (dir + 1) % 8;
 370                         else dir = (dir > 0) ? dir - 1 : 7;
 371                 }
 372
 373                 /* Quit before leaving the dungeon */
 374                 if (!in_bounds(y, x)) break;
 375         }
 376 }
 377
 378
 379 /*!
 380  * @brief ダンジョンの指定位置近辺に森林を配置する /
 381  * Places "streamers" of rock through dungeon
 382  * @param x 指定X座標
 383  * @param y 指定Y座標
 384  * @return なし
 385  * @details
 386  * <pre>
 387  * Put trees near a hole in the dungeon roof  (rubble on ground + up stairway)
 388  * This happens in real world lava tubes.
 389  * </pre>
 390  */
 391 void place_trees(POSITION x, POSITION y)
 392 {
 393         int i, j;
 394         grid_type *g_ptr;
 395
 396         /* place trees/ rubble in ovalish distribution */
 397         for (i = x - 3; i < x + 4; i++)
 398         {
 399                 for (j = y - 3; j < y + 4; j++)
 400                 {
 401                         if (!in_bounds(j, i)) continue;
 402                         g_ptr = &current_floor_ptr->grid_array[j][i];
 403
 404                         if (g_ptr->info & CAVE_ICKY) continue;
 405                         if (g_ptr->o_idx) continue;
 406
 407                         /* Want square to be in the circle and accessable. */
 408                         if ((distance(j, i, y, x) < 4) && !cave_perma_grid(g_ptr))
 409                         {
 410                                 /*
 411                                  * Clear previous contents, add feature
 412                                  * The border mainly gets trees, while the center gets rubble
 413                                  */
 414                                 if ((distance(j, i, y, x) > 1) || (randint1(100) < 25))
 415                                 {
 416                                         if (randint1(100) < 75)
 417                                                 current_floor_ptr->grid_array[j][i].feat = feat_tree;
 418                                 }
 419                                 else
 420                                 {
 421                                         current_floor_ptr->grid_array[j][i].feat = feat_rubble;
 422                                 }
 423
 424                                 /* Clear garbage of hidden trap or door */
 425                                 g_ptr->mimic = 0;
 426
 427                                 /* Light area since is open above */
 428                                 if (!(d_info[p_ptr->dungeon_idx].flags1 & DF1_DARKNESS)) current_floor_ptr->grid_array[j][i].info |= (CAVE_GLOW | CAVE_ROOM);
 429                         }
 430                 }
 431         }
 432
 433         /* No up stairs in ironman mode */
 434         if (!ironman_downward && one_in_(3))
 435         {
 436                 /* up stair */
 437                 current_floor_ptr->grid_array[y][x].feat = feat_up_stair;
 438         }
 439 }
 440
 441
 442 /*!
 443  * @brief ダンジョンに＊破壊＊済み地形ランダムに施す /
 444  * Build a destroyed level
 445  * @return なし
 446  */
 447 void destroy_level(void)
 448 {
 449         POSITION y1, x1;
 450         int n;
 451
 452         /* Note destroyed levels */
 453         msg_print_wizard(CHEAT_DUNGEON, _("階に*破壊*の痕跡を生成しました。", "Destroyed Level."));
 454
 455         /* Drop a few epi-centers (usually about two) */
 456         for (n = 0; n < randint1(5); n++)
 457         {
 458                 /* Pick an epi-center */
 459                 x1 = rand_range(5, current_floor_ptr->width - 1 - 5);
 460                 y1 = rand_range(5, current_floor_ptr->height - 1 - 5);
 461
 462                 (void)destroy_area(y1, x1, 15, TRUE);
 463         }
 464 }