src/tree_cmd.cpp

   1 /* $Id$ */
   2
   3 /*
   4  * This file is part of OpenTTD.
   5  * OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
   6  * OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
   7  * See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
   8  */
   9
  10 /** @file tree_cmd.cpp Handling of tree tiles. */
  11
  12 #include "stdafx.h"
  13 #include "map/ground.h"
  14 #include "map/slope.h"
  15 #include "landscape.h"
  16 #include "viewport_func.h"
  17 #include "command_func.h"
  18 #include "town.h"
  19 #include "genworld.h"
  20 #include "clear_func.h"
  21 #include "company_func.h"
  22 #include "water.h"
  23 #include "company_base.h"
  24 #include "core/random_func.hpp"
  25 #include "newgrf_generic.h"
  26
  27 #include "table/strings.h"
  28 #include "table/tree_land.h"
  29
  30 /**
  31  * List of tree placer algorithm.
  32  *
  33  * This enumeration defines all possible tree placer algorithm in the game.
  34  */
  35 enum TreePlacer {
  36         TP_NONE,     ///< No tree placer algorithm
  37         TP_ORIGINAL, ///< The original algorithm
  38         TP_IMPROVED, ///< A 'improved' algorithm
  39 };
  40
  41 /** Where to place trees while in-game? */
  42 enum ExtraTreePlacement {
  43         ETP_NONE,       ///< Place trees on no tiles
  44         ETP_RAINFOREST, ///< Place trees only on rainforest tiles
  45         ETP_ALL,        ///< Place trees on all tiles
  46 };
  47
  48 /** Determines when to consider building more trees. */
  49 byte _trees_tick_ctr;
  50
  51 static const uint16 DEFAULT_TREE_STEPS = 1000;             ///< Default number of attempts for placing trees.
  52 static const uint16 DEFAULT_RAINFOREST_TREE_STEPS = 15000; ///< Default number of attempts for placing extra trees at rainforest in tropic.
  53 static const uint16 EDITOR_TREE_DIV = 5;                   ///< Game editor tree generation divisor factor.
  54
  55 /**
  56  * Tests if a tile can be converted to have trees
  57  * This is true for clear ground without farms or rocks.
  58  *
  59  * @param tile the tile of interest
  60  * @param allow_desert Allow planting trees on GROUND_DESERT?
  61  * @return true if trees can be built.
  62  */
  63 static bool CanPlantTreesOnTile(TileIndex tile, bool allow_desert)
  64 {
  65         switch (GetTileType(tile)) {
  66                 case TT_WATER:
  67                         return !IsBridgeAbove(tile) && IsCoast(tile) && !IsSlopeWithOneCornerRaised(GetTileSlope(tile));
  68
  69                 case TT_GROUND:
  70                         return IsTileSubtype(tile, TT_GROUND_CLEAR) && !IsBridgeAbove(tile) && GetRawClearGround(tile) != GROUND_ROCKS &&
  71                                (allow_desert || !IsClearGround(tile, GROUND_DESERT));
  72
  73                 default: return false;
  74         }
  75 }
  76
  77 /**
  78  * Creates a tree tile
  79  * Ground type and density is preserved.
  80  *
  81  * @pre the tile must be suitable for trees.
  82  *
  83  * @param tile where to plant the trees.
  84  * @param treetype The type of the tree
  85  * @param count the number of trees (minus 1)
  86  * @param growth the growth status
  87  */
  88 static void PlantTreesOnTile(TileIndex tile, TreeType treetype, uint count, uint growth)
  89 {
  90         assert(treetype != TREE_INVALID);
  91         assert(CanPlantTreesOnTile(tile, true));
  92
  93         Ground ground;
  94         uint density;
  95
  96         switch (GetTileType(tile)) {
  97                 case TT_WATER:
  98                         ground = GROUND_SHORE;
  99                         density = 3;
 100                         break;
 101
 102                 case TT_GROUND:
 103                         assert(IsTileSubtype(tile, TT_GROUND_CLEAR));
 104                         ground = GetFullClearGround(tile);
 105                         density = GetClearDensity(tile);
 106                         break;
 107
 108                 default: NOT_REACHED();
 109         }
 110
 111         MakeTree(tile, treetype, count, growth, ground, density);
 112 }
 113
 114 void AddNeighbouringTree(TileIndex tile)
 115 {
 116         /* Don't plant extra trees if that's not allowed. */
 117         if ((_settings_game.game_creation.landscape == LT_TROPIC && GetTropicZone(tile) == TROPICZONE_RAINFOREST) ?
 118                         _settings_game.construction.extra_tree_placement == ETP_NONE :
 119                         _settings_game.construction.extra_tree_placement != ETP_ALL) {
 120                 return;
 121         }
 122
 123         TreeType treetype = GetTreeType(tile);
 124
 125         tile += TileOffsByDir((Direction)(Random() & 7));
 126
 127         /* Cacti don't spread */
 128         if (!CanPlantTreesOnTile(tile, false)) return;
 129
 130         /* Don't plant trees, if ground was freshly cleared */
 131         if (IsClearTile(tile) && GetClearGround(tile) == GROUND_GRASS && GetClearDensity(tile) != 3) return;
 132
 133         PlantTreesOnTile(tile, treetype, 0, 0);
 134 }
 135
 136 /**
 137  * Get a random TreeType for the given tile based on a given seed
 138  *
 139  * This function returns a random TreeType which can be placed on the given tile.
 140  * The seed for randomness must be less or equal 256, use #GB on the value of Random()
 141  * to get such a value.
 142  *
 143  * @param tile The tile to get a random TreeType from
 144  * @param seed The seed for randomness, must be less or equal 256
 145  * @return The random tree type
 146  */
 147 static TreeType GetRandomTreeType(TileIndex tile, uint seed)
 148 {
 149         switch (_settings_game.game_creation.landscape) {
 150                 case LT_TEMPERATE:
 151                         return (TreeType)(seed * TREE_COUNT_TEMPERATE / 256 + TREE_TEMPERATE);
 152
 153                 case LT_ARCTIC:
 154                         return (TreeType)(seed * TREE_COUNT_SUB_ARCTIC / 256 + TREE_SUB_ARCTIC);
 155
 156                 case LT_TROPIC:
 157                         switch (GetTropicZone(tile)) {
 158                                 case TROPICZONE_NORMAL:  return (TreeType)(seed * TREE_COUNT_SUB_TROPICAL / 256 + TREE_SUB_TROPICAL);
 159                                 case TROPICZONE_DESERT:  return (TreeType)((seed > 12) ? TREE_INVALID : TREE_CACTUS);
 160                                 default:                 return (TreeType)(seed * TREE_COUNT_RAINFOREST / 256 + TREE_RAINFOREST);
 161                         }
 162
 163                 default:
 164                         return (TreeType)(seed * TREE_COUNT_TOYLAND / 256 + TREE_TOYLAND);
 165         }
 166 }
 167
 168 /**
 169  * Make a random tree tile of the given tile
 170  *
 171  * Create a new tree-tile for the given tile. The second parameter is used for
 172  * randomness like type and number of trees.
 173  *
 174  * @param tile The tile to make a tree-tile from
 175  * @param r The randomness value from a Random() value
 176  */
 177 static void PlaceTree(TileIndex tile, uint32 r)
 178 {
 179         TreeType tree = GetRandomTreeType(tile, GB(r, 24, 8));
 180
 181         if (tree != TREE_INVALID) {
 182                 PlantTreesOnTile(tile, tree, GB(r, 22, 2), min(GB(r, 16, 3), 6));
 183
 184                 /* Rerandomize ground, if neither snow nor shore */
 185                 Ground ground = GetClearGround(tile);
 186                 if (ground == GROUND_GRASS || ground == GROUND_ROUGH ) {
 187                         SetClearGroundDensity(tile, GB(r, 28, 1) ? GROUND_ROUGH : GROUND_GRASS, 3);
 188                 }
 189
 190                 /* Set the counter to a random start value */
 191                 SetClearCounter(tile, (Ground)GB(r, 24, 4));
 192         }
 193 }
 194
 195 /**
 196  * Creates a number of tree groups.
 197  * The number of trees in each group depends on how many trees are actually placed around the given tile.
 198  *
 199  * @param num_groups Number of tree groups to place.
 200  */
 201 static void PlaceTreeGroups(uint num_groups)
 202 {
 203         do {
 204                 TileIndex center_tile = RandomTile();
 205
 206                 for (uint i = 0; i < DEFAULT_TREE_STEPS; i++) {
 207                         uint32 r = Random();
 208                         int x = GB(r, 0, 5) - 16;
 209                         int y = GB(r, 8, 5) - 16;
 210                         uint dist = abs(x) + abs(y);
 211                         TileIndex cur_tile = TileAddWrap(center_tile, x, y);
 212
 213                         IncreaseGeneratingWorldProgress(GWP_TREE);
 214
 215                         if (cur_tile != INVALID_TILE && dist <= 13 && CanPlantTreesOnTile(cur_tile, true)) {
 216                                 PlaceTree(cur_tile, r);
 217                         }
 218                 }
 219
 220         } while (--num_groups);
 221 }
 222
 223 /**
 224  * Place a tree at the same height as an existing tree.
 225  *
 226  * Add a new tree around the given tile which is at the same
 227  * height or at some offset (2 units) of it.
 228  *
 229  * @param tile The base tile to add a new tree somewhere around
 230  * @param height The height (like the one from the tile)
 231  */
 232 static void PlaceTreeAtSameHeight(TileIndex tile, int height)
 233 {
 234         for (uint i = 0; i < DEFAULT_TREE_STEPS; i++) {
 235                 uint32 r = Random();
 236                 int x = GB(r, 0, 5) - 16;
 237                 int y = GB(r, 8, 5) - 16;
 238                 TileIndex cur_tile = TileAddWrap(tile, x, y);
 239                 if (cur_tile == INVALID_TILE) continue;
 240
 241                 /* Keep in range of the existing tree */
 242                 if (abs(x) + abs(y) > 16) continue;
 243
 244                 /* Clear tile, no farm-tiles or rocks */
 245                 if (!CanPlantTreesOnTile(cur_tile, true)) continue;
 246
 247                 /* Not too much height difference */
 248                 if (Delta(GetTileZ(cur_tile), height) > 2) continue;
 249
 250                 /* Place one tree and quit */
 251                 PlaceTree(cur_tile, r);
 252                 break;
 253         }
 254 }
 255
 256 /**
 257  * Place some trees randomly
 258  *
 259  * This function just place some trees randomly on the map.
 260  */
 261 void PlaceTreesRandomly()
 262 {
 263         int i, j, ht;
 264
 265         i = ScaleByMapSize(DEFAULT_TREE_STEPS);
 266         if (_game_mode == GM_EDITOR) i /= EDITOR_TREE_DIV;
 267         do {
 268                 uint32 r = Random();
 269                 TileIndex tile = RandomTileSeed(r);
 270
 271                 IncreaseGeneratingWorldProgress(GWP_TREE);
 272
 273                 if (CanPlantTreesOnTile(tile, true)) {
 274                         PlaceTree(tile, r);
 275                         if (_settings_game.game_creation.tree_placer != TP_IMPROVED) continue;
 276
 277                         /* Place a number of trees based on the tile height.
 278                          *  This gives a cool effect of multiple trees close together.
 279                          *  It is almost real life ;) */
 280                         ht = GetTileZ(tile);
 281                         /* The higher we get, the more trees we plant */
 282                         j = GetTileZ(tile) * 2;
 283                         /* Above snowline more trees! */
 284                         if (_settings_game.game_creation.landscape == LT_ARCTIC && ht > GetSnowLine()) j *= 3;
 285                         while (j--) {
 286                                 PlaceTreeAtSameHeight(tile, ht);
 287                         }
 288                 }
 289         } while (--i);
 290
 291         /* place extra trees at rainforest area */
 292         if (_settings_game.game_creation.landscape == LT_TROPIC) {
 293                 i = ScaleByMapSize(DEFAULT_RAINFOREST_TREE_STEPS);
 294                 if (_game_mode == GM_EDITOR) i /= EDITOR_TREE_DIV;
 295
 296                 do {
 297                         uint32 r = Random();
 298                         TileIndex tile = RandomTileSeed(r);
 299
 300                         IncreaseGeneratingWorldProgress(GWP_TREE);
 301
 302                         if (GetTropicZone(tile) == TROPICZONE_RAINFOREST && CanPlantTreesOnTile(tile, false)) {
 303                                 PlaceTree(tile, r);
 304                         }
 305                 } while (--i);
 306         }
 307 }
 308
 309 /**
 310  * Place new trees.
 311  *
 312  * This function takes care of the selected tree placer algorithm and
 313  * place randomly the trees for a new game.
 314  */
 315 void GenerateTrees()
 316 {
 317         uint i, total;
 318
 319         if (_settings_game.game_creation.tree_placer == TP_NONE) return;
 320
 321         switch (_settings_game.game_creation.tree_placer) {
 322                 case TP_ORIGINAL: i = _settings_game.game_creation.landscape == LT_ARCTIC ? 15 : 6; break;
 323                 case TP_IMPROVED: i = _settings_game.game_creation.landscape == LT_ARCTIC ?  4 : 2; break;
 324                 default: NOT_REACHED();
 325         }
 326
 327         total = ScaleByMapSize(DEFAULT_TREE_STEPS);
 328         if (_settings_game.game_creation.landscape == LT_TROPIC) total += ScaleByMapSize(DEFAULT_RAINFOREST_TREE_STEPS);
 329         total *= i;
 330         uint num_groups = (_settings_game.game_creation.landscape != LT_TOYLAND) ? ScaleByMapSize(GB(Random(), 0, 5) + 25) : 0;
 331         total += num_groups * DEFAULT_TREE_STEPS;
 332         SetGeneratingWorldProgress(GWP_TREE, total);
 333
 334         if (num_groups != 0) PlaceTreeGroups(num_groups);
 335
 336         for (; i != 0; i--) {
 337                 PlaceTreesRandomly();
 338         }
 339 }
 340
 341 /**
 342  * Plant a tree.
 343  * @param tile start tile of area-drag of tree plantation
 344  * @param flags type of operation
 345  * @param p1 tree type, TREE_INVALID means random.
 346  * @param p2 end tile of area-drag
 347  * @param text unused
 348  * @return the cost of this operation or an error
 349  */
 350 CommandCost CmdPlantTree(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
 351 {
 352         StringID msg = INVALID_STRING_ID;
 353         CommandCost cost(EXPENSES_OTHER);
 354         const byte tree_to_plant = GB(p1, 0, 8); // We cannot use Extract as min and max are climate specific.
 355
 356         if (p2 >= MapSize()) return CMD_ERROR;
 357         /* Check the tree type within the current climate */
 358         if (tree_to_plant != TREE_INVALID && !IsInsideBS(tree_to_plant, _tree_base_by_landscape[_settings_game.game_creation.landscape], _tree_count_by_landscape[_settings_game.game_creation.landscape])) return CMD_ERROR;
 359
 360         Company *c = (_game_mode != GM_EDITOR) ? Company::GetIfValid(_current_company) : NULL;
 361         int limit = (c == NULL ? INT32_MAX : GB(c->tree_limit, 16, 16));
 362
 363         TileArea ta(tile, p2);
 364         TILE_AREA_LOOP(tile, ta) {
 365                 switch (GetTileType(tile)) {
 366                         case TT_GROUND:
 367                                 if (!IsTreeTile(tile)) break;
 368
 369                                 /* no more space for trees? */
 370                                 if (_game_mode != GM_EDITOR && GetTreeCount(tile) == 4) {
 371                                         msg = STR_ERROR_TREE_ALREADY_HERE;
 372                                         continue;
 373                                 }
 374
 375                                 /* Test tree limit. */
 376                                 if (--limit < 1) {
 377                                         msg = STR_ERROR_TREE_PLANT_LIMIT_REACHED;
 378                                         break;
 379                                 }
 380
 381                                 if (flags & DC_EXEC) {
 382                                         AddTreeCount(tile, 1);
 383                                         MarkTileDirtyByTile(tile);
 384                                         if (c != NULL) c->tree_limit -= 1 << 16;
 385                                 }
 386                                 /* 2x as expensive to add more trees to an existing tile */
 387                                 cost.AddCost(_price[PR_BUILD_TREES] * 2);
 388                                 continue;
 389
 390                         case TT_WATER:
 391                                 if (!IsCoast(tile) || IsSlopeWithOneCornerRaised(GetTileSlope(tile))) {
 392                                         msg = STR_ERROR_CAN_T_BUILD_ON_WATER;
 393                                         continue;
 394                                 }
 395                                 break;
 396
 397                         default:
 398                                 msg = STR_ERROR_SITE_UNSUITABLE;
 399                                 continue;
 400                 }
 401
 402                 if (IsBridgeAbove(tile)) {
 403                         msg = STR_ERROR_SITE_UNSUITABLE;
 404                         continue;
 405                 }
 406
 407                 TreeType treetype = (TreeType)tree_to_plant;
 408                 /* Be a bit picky about which trees go where. */
 409                 if (_settings_game.game_creation.landscape == LT_TROPIC && treetype != TREE_INVALID && (
 410                                 /* No cacti outside the desert */
 411                                 (treetype == TREE_CACTUS && GetTropicZone(tile) != TROPICZONE_DESERT) ||
 412                                 /* No rain forest trees outside the rain forest, except in the editor mode where it makes those tiles rain forest tile */
 413                                 (IsInsideMM(treetype, TREE_RAINFOREST, TREE_CACTUS) && GetTropicZone(tile) != TROPICZONE_RAINFOREST && _game_mode != GM_EDITOR) ||
 414                                 /* And no subtropical trees in the desert/rain forest */
 415                                 (IsInsideMM(treetype, TREE_SUB_TROPICAL, TREE_TOYLAND) && GetTropicZone(tile) != TROPICZONE_NORMAL))) {
 416                         msg = STR_ERROR_TREE_WRONG_TERRAIN_FOR_TREE_TYPE;
 417                         continue;
 418                 }
 419
 420                 /* Test tree limit. */
 421                 if (--limit < 1) {
 422                         msg = STR_ERROR_TREE_PLANT_LIMIT_REACHED;
 423                         break;
 424                 }
 425
 426                 if (IsTileType(tile, TT_GROUND)) {
 427                         /* Remove fields or rocks. Note that the ground will get barrened */
 428                         if (IsTileSubtype(tile, TT_GROUND_FIELDS) || GetRawClearGround(tile) == GROUND_ROCKS) {
 429                                 CommandCost ret = DoCommand(tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
 430                                 if (ret.Failed()) return ret;
 431                                 cost.AddCost(ret);
 432                         }
 433                 }
 434
 435                 if (_game_mode != GM_EDITOR && Company::IsValidID(_current_company)) {
 436                         Town *t = ClosestTownFromTile(tile, _settings_game.economy.dist_local_authority);
 437                         if (t != NULL) ChangeTownRating(t, RATING_TREE_UP_STEP, RATING_TREE_MAXIMUM, flags);
 438                 }
 439
 440                 if (flags & DC_EXEC) {
 441                         if (treetype == TREE_INVALID) {
 442                                 treetype = GetRandomTreeType(tile, GB(Random(), 24, 8));
 443                                 if (treetype == TREE_INVALID) treetype = TREE_CACTUS;
 444                         }
 445
 446                         /* Plant full grown trees in scenario editor */
 447                         PlantTreesOnTile(tile, treetype, 0, _game_mode == GM_EDITOR ? 3 : 0);
 448                         MarkTileDirtyByTile(tile);
 449                         if (c != NULL) c->tree_limit -= 1 << 16;
 450
 451                         /* When planting rainforest-trees, set tropiczone to rainforest in editor. */
 452                         if (_game_mode == GM_EDITOR && IsInsideMM(treetype, TREE_RAINFOREST, TREE_CACTUS)) {
 453                                 SetTropicZone(tile, TROPICZONE_RAINFOREST);
 454                         }
 455                 }
 456
 457                 cost.AddCost(_price[PR_BUILD_TREES]);
 458
 459                 /* Tree limit used up? No need to check more. */
 460                 if (limit < 0) break;
 461         }
 462
 463         if (cost.GetCost() == 0) {
 464                 return_cmd_error(msg);
 465         } else {
 466                 return cost;
 467         }
 468 }
 469
 470 void OnTick_Trees()
 471 {
 472         /* Don't place trees if that's not allowed */
 473         if (_settings_game.construction.extra_tree_placement == ETP_NONE) return;
 474
 475         uint32 r;
 476         TileIndex tile;
 477         TreeType tree;
 478
 479         /* place a tree at a random rainforest spot */
 480         if (_settings_game.game_creation.landscape == LT_TROPIC &&
 481                         (r = Random(), tile = RandomTileSeed(r), GetTropicZone(tile) == TROPICZONE_RAINFOREST) &&
 482                         CanPlantTreesOnTile(tile, false) &&
 483                         (tree = GetRandomTreeType(tile, GB(r, 24, 8))) != TREE_INVALID) {
 484                 PlantTreesOnTile(tile, tree, 0, 0);
 485         }
 486
 487         /* byte underflow */
 488         if (--_trees_tick_ctr != 0 || _settings_game.construction.extra_tree_placement != ETP_ALL) return;
 489
 490         /* place a tree at a random spot */
 491         r = Random();
 492         tile = RandomTileSeed(r);
 493         if (CanPlantTreesOnTile(tile, false) && (tree = GetRandomTreeType(tile, GB(r, 24, 8))) != TREE_INVALID) {
 494                 PlantTreesOnTile(tile, tree, 0, 0);
 495         }
 496 }
 497
 498 void InitializeTrees()
 499 {
 500         _trees_tick_ctr = 0;
 501 }