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