src/streams.c

   1 /*
   2  * File: streams.c
   3  * Purpose: Used by dungeon generation. This file holds all the
   4  * functions that are applied to a level after the rest has been
   5  * generated, ie streams and level destruction.
   6  */
   7
   8 /*
   9  * Copyright (c) 1997 Ben Harrison, James E. Wilson, Robert A. Koeneke
  10  *
  11  * This software may be copied and distributed for educational, research,
  12  * and not for profit purposes provided that this copyright and statement
  13  * are included in all such copies.  Other copyrights may also apply.
  14  */
  15
  16 #include "angband.h"
  17 #include "generate.h"
  18 #include "streams.h"
  19 #include "grid.h"
  20
  21
  22 /*
  23  * Recursive fractal algorithm to place water through the dungeon.
  24  */
  25 static void recursive_river(int x1, int y1, int x2, int y2, int feat1, int feat2, int width)
  26 {
  27         int dx, dy, length, l, x, y;
  28         int changex, changey;
  29         int ty, tx;
  30         bool done;
  31         cave_type *c_ptr;
  32
  33         length = distance(x1, y1, x2, y2);
  34
  35         if (length > 4)
  36         {
  37                 /*
  38                  * Divide path in half and call routine twice.
  39                  * There is a small chance of splitting the river
  40                  */
  41                 dx = (x2 - x1) / 2;
  42                 dy = (y2 - y1) / 2;
  43
  44                 if (dy != 0)
  45                 {
  46                         /* perturbation perpendicular to path */
  47                         changex = randint1(abs(dy)) * 2 - abs(dy);
  48                 }
  49                 else
  50                 {
  51                         changex = 0;
  52                 }
  53
  54                 if (dx != 0)
  55                 {
  56                         /* perturbation perpendicular to path */
  57                         changey = randint1(abs(dx)) * 2 - abs(dx);
  58                 }
  59                 else
  60                 {
  61                         changey = 0;
  62                 }
  63
  64                 if (!in_bounds(y1 + dy + changey, x1 + dx + changex))
  65                 {
  66                         changex = 0;
  67                         changey = 0;
  68                 }
  69
  70                 /* construct river out of two smaller ones */
  71                 recursive_river(x1, y1, x1 + dx + changex, y1 + dy + changey, feat1, feat2, width);
  72                 recursive_river(x1 + dx + changex, y1 + dy + changey, x2, y2, feat1, feat2, width);
  73
  74                 /* Split the river some of the time - junctions look cool */
  75                 if (one_in_(DUN_WAT_CHG) && (width > 0))
  76                 {
  77                         recursive_river(x1 + dx + changex, y1 + dy + changey,
  78                                         x1 + 8 * (dx + changex), y1 + 8 * (dy + changey),
  79                                         feat1, feat2, width - 1);
  80                 }
  81         }
  82         else
  83         {
  84                 /* Actually build the river */
  85                 for (l = 0; l < length; l++)
  86                 {
  87                         x = x1 + l * (x2 - x1) / length;
  88                         y = y1 + l * (y2 - y1) / length;
  89
  90                         done = FALSE;
  91
  92                         while (!done)
  93                         {
  94                                 for (ty = y - width - 1; ty <= y + width + 1; ty++)
  95                                 {
  96                                         for (tx = x - width - 1; tx <= x + width + 1; tx++)
  97                                         {
  98                                                 if (!in_bounds2(ty, tx)) continue;
  99
 100                                                 c_ptr = &cave[ty][tx];
 101
 102                                                 if (c_ptr->feat == feat1) continue;
 103                                                 if (c_ptr->feat == feat2) continue;
 104
 105                                                 if (distance(ty, tx, y, x) > rand_spread(width, 1)) continue;
 106
 107                                                 /* Do not convert permanent features */
 108                                                 if (cave_perma_grid(c_ptr) && (c_ptr->feat != FEAT_MOUNTAIN)) continue;
 109
 110                                                 /*
 111                                                  * Clear previous contents, add feature
 112                                                  * The border mainly gets feat2, while the center gets feat1
 113                                                  */
 114                                                 if (distance(ty, tx, y, x) > width)
 115                                                         c_ptr->feat = feat2;
 116                                                 else
 117                                                         c_ptr->feat = feat1;
 118
 119                                                 /* Clear garbage of hidden trap or door */
 120                                                 c_ptr->mimic = 0;
 121
 122                                                 /* Lava terrain glows */
 123                                                 if ((feat1 == FEAT_DEEP_LAVA) ||  (feat1 == FEAT_SHAL_LAVA))
 124                                                 {
 125                                                         if (!(d_info[dungeon_type].flags1 & DF1_DARKNESS)) c_ptr->info |= CAVE_GLOW;
 126                                                 }
 127
 128                                                 /* Hack -- don't teleport here */
 129                                                 c_ptr->info |= CAVE_ICKY;
 130                                         }
 131                                 }
 132
 133                                 done = TRUE;
 134                         }
 135                 }
 136         }
 137 }
 138
 139
 140 /*
 141  * Places water /lava through dungeon.
 142  */
 143 void add_river(int feat1, int feat2)
 144 {
 145         int y2, x2;
 146         int y1 = 0, x1 = 0;
 147         int wid;
 148
 149
 150         /* Hack -- Choose starting point */
 151         y2 = randint1(cur_hgt / 2 - 2) + cur_hgt / 2;
 152         x2 = randint1(cur_wid / 2 - 2) + cur_wid / 2;
 153
 154         /* Hack -- Choose ending point somewhere on boundary */
 155         switch(randint1(4))
 156         {
 157                 case 1:
 158                 {
 159                         /* top boundary */
 160                         x1 = randint1(cur_wid-2)+1;
 161                         y1 = 1;
 162                         break;
 163                 }
 164                 case 2:
 165                 {
 166                         /* left boundary */
 167                         x1 = 1;
 168                         y1 = randint1(cur_hgt-2)+1;
 169                         break;
 170                 }
 171                 case 3:
 172                 {
 173                         /* right boundary */
 174                         x1 = cur_wid-1;
 175                         y1 = randint1(cur_hgt-2)+1;
 176                         break;
 177                 }
 178                 case 4:
 179                 {
 180                         /* bottom boundary */
 181                         x1 = randint1(cur_wid-2)+1;
 182                         y1 = cur_hgt-1;
 183                         break;
 184                 }
 185         }
 186
 187         wid = randint1(DUN_WAT_RNG);
 188         recursive_river(x1, y1, x2, y2, feat1, feat2, wid);
 189
 190         /* Hack - Save the location as a "room" */
 191         if (dun->cent_n < CENT_MAX)
 192         {
 193                 dun->cent[dun->cent_n].y = y2;
 194                 dun->cent[dun->cent_n].x = x2;
 195                 dun->cent_n++;
 196         }
 197 }
 198
 199
 200 /*
 201  * Places "streamers" of rock through dungeon
 202  *
 203  * Note that their are actually six different terrain features used
 204  * to represent streamers.  Three each of magma and quartz, one for
 205  * basic vein, one with hidden gold, and one with known gold.  The
 206  * hidden gold types are currently unused.
 207  */
 208 void build_streamer(int feat, int chance)
 209 {
 210         int             i, tx, ty;
 211         int             y, x, dir;
 212         int dummy = 0;
 213         bool treasure = FALSE;
 214
 215         cave_type *c_ptr;
 216
 217         /* Hack -- Choose starting point */
 218         y = rand_spread(cur_hgt / 2, cur_hgt / 6);
 219         x = rand_spread(cur_wid / 2, cur_wid / 6);
 220
 221         /* Choose a random compass direction */
 222         dir = ddd[randint0(8)];
 223
 224         /* Place streamer into dungeon */
 225         while (dummy < SAFE_MAX_ATTEMPTS)
 226         {
 227                 dummy++;
 228
 229                 /* One grid per density */
 230                 for (i = 0; i < DUN_STR_DEN; i++)
 231                 {
 232                         int d = DUN_STR_RNG;
 233
 234                         /* Pick a nearby grid */
 235                         while (1)
 236                         {
 237                                 ty = rand_spread(y, d);
 238                                 tx = rand_spread(x, d);
 239                                 if (!in_bounds2(ty, tx)) continue;
 240                                 break;
 241                         }
 242
 243                         /* Access the grid */
 244                         c_ptr = &cave[ty][tx];
 245
 246                         if ((c_ptr->feat >= FEAT_DEEP_WATER) && (c_ptr->feat <= FEAT_SHAL_LAVA)) continue;
 247                         if ((c_ptr->feat >= FEAT_PERM_EXTRA) && (c_ptr->feat <= FEAT_PERM_SOLID)) continue;
 248
 249                         /* Only convert "granite" walls */
 250                         if ((feat >= FEAT_MAGMA) && (feat <= FEAT_WALL_SOLID))
 251                         {
 252                                 if (!is_extra_grid(c_ptr) && !is_inner_grid(c_ptr) && !is_outer_grid(c_ptr) && !is_solid_grid(c_ptr)) continue;
 253                                 if (is_closed_door(c_ptr->feat)) continue;
 254                                 if ((feat == FEAT_MAGMA) || (feat == FEAT_QUARTZ)) treasure = TRUE;
 255                         }
 256                         else
 257                         {
 258                                 if (cave_perma_grid(c_ptr) && (c_ptr->feat != FEAT_MOUNTAIN)) continue;
 259                         }
 260
 261                         /* Clear previous contents, add proper vein type */
 262                         c_ptr->feat = feat;
 263
 264                         /* Paranoia: Clear mimic field */
 265                         c_ptr->mimic = 0;
 266
 267                         /* Hack -- Add some known treasure */
 268                         if (treasure && one_in_(chance))
 269                                 c_ptr->feat += (FEAT_MAGMA_K - FEAT_MAGMA);
 270
 271                         /* Hack -- Add some hidden treasure */
 272                         else if (treasure && one_in_(chance/4))
 273                                 c_ptr->feat += (FEAT_MAGMA_H - FEAT_MAGMA);
 274                 }
 275
 276                 if (dummy >= SAFE_MAX_ATTEMPTS)
 277                 {
 278                         if (cheat_room)
 279                         {
 280 #ifdef JP
 281 msg_print("·Ù¹ð¡ª¥¹¥È¥ê¡¼¥Þ¡¼¤òÇÛÃÖ¤Ç¤¤Þ¤»¤ó¡ª");
 282 #else
 283                                 msg_print("Warning! Could not place streamer!");
 284 #endif
 285
 286                         }
 287                         return;
 288                 }
 289
 290
 291                 /* Advance the streamer */
 292                 y += ddy[dir];
 293                 x += ddx[dir];
 294
 295                 /* Quit before leaving the dungeon */
 296                 if (!in_bounds(y, x)) break;
 297         }
 298 }
 299
 300
 301 /*
 302  * Put trees near a hole in the dungeon roof  (rubble on ground + up stairway)
 303  * This happens in real world lava tubes.
 304  */
 305 void place_trees(int x, int y)
 306 {
 307         int i, j;
 308         cave_type *c_ptr;
 309
 310         /* place trees/ rubble in ovalish distribution */
 311         for (i = x - 3; i < x + 4; i++)
 312         {
 313                 for (j = y - 3; j < y + 4; j++)
 314                 {
 315                         if (!in_bounds(j, i)) continue;
 316                         c_ptr = &cave[j][i];
 317
 318                         if (c_ptr->info & CAVE_ICKY) continue;
 319                         if (c_ptr->o_idx) continue;
 320
 321                         /* Want square to be in the circle and accessable. */
 322                         if ((distance(j, i, y, x) < 4) && !cave_perma_grid(c_ptr))
 323                         {
 324                                 /*
 325                                  * Clear previous contents, add feature
 326                                  * The border mainly gets trees, while the center gets rubble
 327                                  */
 328                                 if ((distance(j, i, y, x) > 1) || (randint1(100) < 25))
 329                                 {
 330                                         if (randint1(100) < 75)
 331                                                 cave[j][i].feat = FEAT_TREES;
 332                                 }
 333                                 else
 334                                 {
 335                                         cave[j][i].feat = FEAT_RUBBLE;
 336                                 }
 337
 338                                 /* Clear garbage of hidden trap or door */
 339                                 c_ptr->mimic = 0;
 340
 341                                 /* Light area since is open above */
 342                                 if (!(d_info[dungeon_type].flags1 & DF1_DARKNESS)) cave[j][i].info |= (CAVE_GLOW | CAVE_ROOM);
 343                         }
 344                 }
 345         }
 346
 347         /* No up stairs in ironman mode */
 348         if (!ironman_downward && one_in_(3))
 349         {
 350                 /* up stair */
 351                 cave[y][x].feat = FEAT_LESS;
 352         }
 353 }
 354
 355
 356 /*
 357  * Build a destroyed level
 358  */
 359 void destroy_level(void)
 360 {
 361         int y1, x1, n;
 362
 363         /* Note destroyed levels */
 364 #ifdef JP
 365         if (cheat_room) msg_print("ÇË²õ¤µ¤ì¤¿³¬");
 366 #else
 367         if (cheat_room) msg_print("Destroyed Level");
 368 #endif
 369
 370         /* Drop a few epi-centers (usually about two) */
 371         for (n = 0; n < randint1(5); n++)
 372         {
 373                 /* Pick an epi-center */
 374                 x1 = rand_range(5, cur_wid - 1 - 5);
 375                 y1 = rand_range(5, cur_hgt - 1 - 5);
 376
 377                 (void)destroy_area(y1, x1, 15, TRUE);
 378         }
 379 }