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