summaryrefslogtreecommitdiff
path: root/src/ai/api/ai_tile.hpp
blob: 944821e00757dcbe384c0274785c08ad93af764b (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
/* $Id$ */

/*
 * This file is part of OpenTTD.
 * 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.
 * 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.
 * 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/>.
 */

/** @file ai_tile.hpp Everything to query and manipulate tiles. */

#ifndef AI_TILE_HPP
#define AI_TILE_HPP

#include "ai_error.hpp"
#include "ai_company.hpp"

/**
 * Class that handles all tile related functions.
 */
class AITile : public AIObject {
public:
	/** Get the name of this class to identify it towards squirrel. */
	static const char *GetClassName() { return "AITile"; }

	/**
	 * Error messages related to modifying tiles.
	 */
	enum ErrorMessages {

		/** Base for tile related errors */
		ERR_TILE_BASE = AIError::ERR_CAT_TILE << AIError::ERR_CAT_BIT_SIZE,

		/** Tile can't be raised any higher */
		ERR_TILE_TOO_HIGH,                     // [STR_ERROR_ALREADY_AT_SEA_LEVEL]

		/** Tile can't be lowered any lower */
		ERR_TILE_TOO_LOW,                      // [STR_ERROR_ALREADY_AT_SEA_LEVEL]

		/** The area was already flat */
		ERR_AREA_ALREADY_FLAT,                 // [STR_ERROR_ALREADY_LEVELLED]

		/** There is a tunnel underneed */
		ERR_EXCAVATION_WOULD_DAMAGE,           // [STR_ERROR_EXCAVATION_WOULD_DAMAGE]
	};

	/**
	 * Enumeration for corners of tiles.
	 */
	enum Corner {
		CORNER_W       = 0,      ///< West corner
		CORNER_S       = 1,      ///< South corner
		CORNER_E       = 2,      ///< East corner
		CORNER_N       = 3,      ///< North corner

		CORNER_INVALID = 0xFF,
	};

	/**
	 * Enumeration for the slope-type.
	 *
	 * This enumeration use the chars N, E, S, W corresponding the
	 *  direction North, East, South and West. The top corner of a tile
	 *  is the north-part of the tile.
	 */
	enum Slope {
		/* Values are important, as they represent the internal state of the game. */
		SLOPE_FLAT     = 0x00,                                  ///< A flat tile
		SLOPE_W        = 1 << CORNER_W,                         ///< The west corner of the tile is raised
		SLOPE_S        = 1 << CORNER_S,                         ///< The south corner of the tile is raised
		SLOPE_E        = 1 << CORNER_E,                         ///< The east corner of the tile is raised
		SLOPE_N        = 1 << CORNER_N,                         ///< The north corner of the tile is raised
		SLOPE_STEEP    = 0x10,                                  ///< Indicates the slope is steep (The corner opposite of the not-raised corner is raised two times)
		SLOPE_NW       = SLOPE_N | SLOPE_W,                     ///< North and west corner are raised
		SLOPE_SW       = SLOPE_S | SLOPE_W,                     ///< South and west corner are raised
		SLOPE_SE       = SLOPE_S | SLOPE_E,                     ///< South and east corner are raised
		SLOPE_NE       = SLOPE_N | SLOPE_E,                     ///< North and east corner are raised
		SLOPE_EW       = SLOPE_E | SLOPE_W,                     ///< East and west corner are raised
		SLOPE_NS       = SLOPE_N | SLOPE_S,                     ///< North and south corner are raised
		SLOPE_ELEVATED = SLOPE_N | SLOPE_E | SLOPE_S | SLOPE_W, ///< Bit mask containing all 'simple' slopes. Does not appear as a slope.
		SLOPE_NWS      = SLOPE_N | SLOPE_W | SLOPE_S,           ///< North, west and south corner are raised
		SLOPE_WSE      = SLOPE_W | SLOPE_S | SLOPE_E,           ///< West, south and east corner are raised
		SLOPE_SEN      = SLOPE_S | SLOPE_E | SLOPE_N,           ///< South, east and north corner are raised
		SLOPE_ENW      = SLOPE_E | SLOPE_N | SLOPE_W,           ///< East, north and west corner are raised
		SLOPE_STEEP_W  = SLOPE_STEEP | SLOPE_NWS,               ///< A steep slope falling to east (from west)
		SLOPE_STEEP_S  = SLOPE_STEEP | SLOPE_WSE,               ///< A steep slope falling to north (from south)
		SLOPE_STEEP_E  = SLOPE_STEEP | SLOPE_SEN,               ///< A steep slope falling to west (from east)
		SLOPE_STEEP_N  = SLOPE_STEEP | SLOPE_ENW,               ///< A steep slope falling to south (from north)

		SLOPE_INVALID  = 0xFFFF,                                ///< An invalid slope
	};

	/**
	 * The different transport types a tile can have.
	 */
	enum TransportType {
		/* Values are important, as they represent the internal state of the game. */
		TRANSPORT_RAIL    =  0, ///< Tile with rail.
		TRANSPORT_ROAD    =  1, ///< Tile with road.
		TRANSPORT_WATER   =  2, ///< Tile with navigable waterways.
		TRANSPORT_AIR     =  3, ///< Tile with airport.

		TRANSPORT_INVALID = -1, ///< Tile without any transport type.
	};

	/**
	 * Get the base cost for building/clearing several things.
	 */
	enum BuildType {
		BT_FOUNDATION,   ///< Build a foundation under something
		BT_TERRAFORM,    ///< Terraform
		BT_BUILD_TREES,  ///< Build trees
		BT_CLEAR_GRASS,  ///< Clear a tile with just grass
		BT_CLEAR_ROUGH,  ///< Clear a rough tile
		BT_CLEAR_ROCKY,  ///< Clear a tile with rocks
		BT_CLEAR_FIELDS, ///< Clear a tile with farm fields
		BT_CLEAR_HOUSE,  ///< Clear a tile with a house
	};

	/**
	 * Check if this tile is buildable, i.e. no things on it that needs
	 *  demolishing.
	 * @param tile The tile to check on.
	 * @pre AIMap::IsValidTile(tile).
	 * @return True if it is buildable, false if not.
	 * @note For trams you also might want to check for AIRoad::IsRoad(),
	 *   as you can build tram-rails on road-tiles.
	 * @note For rail you also might want to check for AIRoad::IsRoad(),
	 *   as in some cases you can build rails on road-tiles.
	 */
	static bool IsBuildable(TileIndex tile);

	/**
	 * Check if this tile is buildable in a rectangle around a tile, with the
	 *  entry in the list as top-left.
	 * @param tile The tile to check on.
	 * @param width The width of the rectangle.
	 * @param height The height of the rectangle.
	 * @pre AIMap::IsValidTile(tile).
	 * @return True if it is buildable, false if not.
	 */
	static bool IsBuildableRectangle(TileIndex tile, uint width, uint height);

	/**
	 * Checks whether the given tile is actually a water tile.
	 * @param tile The tile to check on.
	 * @pre AIMap::IsValidTile(tile).
	 * @return True if and only if the tile is a water tile.
	 */
	static bool IsWaterTile(TileIndex tile);

	/**
	 * Checks whether the given tile is actually a coast tile.
	 * @param tile The tile to check.
	 * @pre AIMap::IsValidTile(tile).
	 * @return True if and only if the tile is a coast tile.
	 * @note Building on coast tiles in general is more expensive. This is not
	 *  true if there are also trees on the tile, see #HasTreeOnTile.
	 */
	static bool IsCoastTile(TileIndex tile);

	/**
	 * Checks whether the given tile is a station tile of any station.
	 * @param tile The tile to check.
	 * @pre AIMap::IsValidTile(tile).
	 * @return True if and only if the tile is a station tile.
	 */
	static bool IsStationTile(TileIndex tile);

	/**
	 * Check if a tile has a steep slope.
	 * Steep slopes are slopes with a height difference of 2 across one diagonal of the tile.
	 * @param slope The slope to check on.
	 * @pre slope != SLOPE_INVALID.
	 * @return True if the slope is a steep slope.
	 */
	static bool IsSteepSlope(Slope slope);

	/**
	 * Check if a tile has a halftile slope.
	 * Halftile slopes appear on top of halftile foundations. E.g. the slope you get when building a horizontal railtrack on the top of a SLOPE_N or SLOPE_STEEP_N.
	 * @param slope The slope to check on.
	 * @pre slope != SLOPE_INVALID.
	 * @return True if the slope is a halftile slope.
	 * @note Currently there is no API function that would return or accept a halftile slope.
	 */
	static bool IsHalftileSlope(Slope slope);

	/**
	 * Check if the tile has any tree on it.
	 * @param tile The tile to check on.
	 * @pre AIMap::IsValidTile(tile).
	 * @return True if and only if there is a tree on the tile.
	 */
	static bool HasTreeOnTile(TileIndex tile);

	/**
	 * Check if the tile is a farmland tile.
	 * @param tile The tile to check on.
	 * @pre AIMap::IsValidTile(tile).
	 * @return True if and only if the tile is farmland.
	 */
	static bool IsFarmTile(TileIndex tile);

	/**
	 * Check if the tile is a rock tile.
	 * @param tile The tile to check on.
	 * @pre AIMap::IsValidTile(tile).
	 * @return True if and only if the tile is rock tile.
	 */
	static bool IsRockTile(TileIndex tile);

	/**
	 * Check if the tile is a rough tile.
	 * @param tile The tile to check on.
	 * @pre AIMap::IsValidTile(tile).
	 * @return True if and only if the tile is rough tile.
	 */
	static bool IsRoughTile(TileIndex tile);

	/**
	 * Check if the tile is a snow tile.
	 * @param tile The tile to check on.
	 * @pre AIMap::IsValidTile(tile).
	 * @return True if and only if the tile is snow tile.
	 */
	static bool IsSnowTile(TileIndex tile);

	/**
	 * Check if the tile is a desert tile.
	 * @param tile The tile to check on.
	 * @pre AIMap::IsValidTile(tile).
	 * @return True if and only if the tile is desert tile.
	 */
	static bool IsDesertTile(TileIndex tile);

	/**
	 * Get the slope of a tile.
	 * This is the slope of the bare tile. A possible foundation on the tile does not influence this slope.
	 * @param tile The tile to check on.
	 * @pre AIMap::IsValidTile(tile).
	 * @return Bit mask encoding the slope. See #Slope for a description of the returned values.
	 */
	static Slope GetSlope(TileIndex tile);

	/**
	 * Get the complement of the slope.
	 * @param slope The slope to get the complement of.
	 * @pre slope != SLOPE_INVALID.
	 * @pre !IsSteepSlope(slope).
	 * @pre !IsHalftileSlope(slope).
	 * @return The complement of a slope. This means that all corners that
	 *  weren't raised, are raised, and visa versa.
	 */
	static Slope GetComplementSlope(Slope slope);

	/**
	 * Get the minimal height on a tile.
	 * The returned height is the height of the bare tile. A possible foundation on the tile does not influence this height.
	 * @param tile The tile to check on.
	 * @pre AIMap::IsValidTile(tile).
	 * @return The height of the lowest corner of the tile, ranging from 0 to 15.
	 */
	static int32 GetMinHeight(TileIndex tile);

	/**
	 * Get the maximal height on a tile.
	 * The returned height is the height of the bare tile. A possible foundation on the tile does not influence this height.
	 * @param tile The tile to check on.
	 * @pre AIMap::IsValidTile(tile).
	 * @return The height of the highest corner of the tile, ranging from 0 to 15.
	 */
	static int32 GetMaxHeight(TileIndex tile);

	/**
	 * Get the height of a certain corner of a tile.
	 * The returned height is the height of the bare tile. A possible foundation on the tile does not influence this height.
	 * @param tile The tile to check on.
	 * @param corner The corner to query.
	 * @pre AIMap::IsValidTile(tile).
	 * @return The height of the lowest corner of the tile, ranging from 0 to 15.
	 */
	static int32 GetCornerHeight(TileIndex tile, Corner corner);

	/**
	 * Get the owner of the tile.
	 * @param tile The tile to get the owner from.
	 * @pre AIMap::IsValidTile(tile).
	 * @return The CompanyID of the owner of the tile, or COMPANY_INVALID if
	 *  there is no owner (grass/industry/water tiles, etc.).
	 */
	static AICompany::CompanyID GetOwner(TileIndex tile);

	/**
	 * Checks whether the given tile contains parts suitable for the given
	 *  TransportType.
	 * @param tile The tile to check.
	 * @param transport_type The TransportType to check against.
	 * @pre AIMap::IsValidTile(tile).
	 * @pre transport_type != TRANSPORT_AIR.
	 * @note Returns false on tiles with roadworks and on road tiles with only
	 *       a single piece of road as these tiles cannot be used to transport
	 *       anything on. It furthermore returns true on some coast tile for
	 *       TRANSPORT_WATER because ships can navigate over them.
	 * @note Use AIAirport.IsAirportTile to check for airport tiles. Aircraft
	 *       can fly over every tile on the map so using HasTransportType
	 *       doesn't make sense for TRANSPORT_AIR.
	 * @return True if and only if the tile has the given TransportType.
	 */
	static bool HasTransportType(TileIndex tile, TransportType transport_type);

	/**
	 * Check how much cargo this tile accepts.
	 *  It creates a radius around the tile, and adds up all acceptance of this
	 *   cargo.
	 * @param tile The tile to check on.
	 * @param cargo_type The cargo to check the acceptance of.
	 * @param width The width of the station.
	 * @param height The height of the station.
	 * @param radius The radius of the station.
	 * @pre AIMap::IsValidTile(tile).
	 * @pre width > 0.
	 * @pre height > 0.
	 * @pre radius >= 0.
	 * @return Value below 8 means no acceptance; the more the better.
	 */
	static int32 GetCargoAcceptance(TileIndex tile, CargoID cargo_type, int width, int height, int radius);

	/**
	 * Checks how many producers in the radius produces this cargo.
	 *  It creates a radius around the tile, and counts all producer of this cargo.
	 * @param tile The tile to check on.
	 * @param cargo_type The cargo to check the production of.
	 * @param width The width of the station.
	 * @param height The height of the station.
	 * @param radius The radius of the station.
	 * @pre AIMap::IsValidTile(tile).
	 * @pre width > 0.
	 * @pre height > 0.
	 * @pre radius >= 0.
	 * @return The number of producers that produce this cargo within radius of the tile.
	 */
	static int32 GetCargoProduction(TileIndex tile, CargoID cargo_type, int width, int height, int radius);

	/**
	 * Get the manhattan distance from the tile to the tile.
	 * @param tile_from The tile to get the distance to.
	 * @param tile_to The tile to get the distance to.
	 * @return The distance between the two tiles.
	 */
	static int32 GetDistanceManhattanToTile(TileIndex tile_from, TileIndex tile_to);

	/**
	 * Get the square distance from the tile to the tile.
	 * @param tile_from The tile to get the distance to.
	 * @param tile_to The tile to get the distance to.
	 * @return The distance between the two tiles.
	 */
	static int32 GetDistanceSquareToTile(TileIndex tile_from, TileIndex tile_to);

	/**
	 * Raise the given corners of the tile. The corners can be combined,
	 *  for example: SLOPE_N | SLOPE_W (= SLOPE_NW) will raise the west and the north corner.
	 * @note The corners will be modified in the order west (first), south, east, north (last).
	 *       Changing one corner might cause another corner to be changed too. So modifiing
	 *       multiple corners may result in changing some corners by multiple steps.
	 * @param tile The tile to raise.
	 * @param slope Corners to raise (SLOPE_xxx).
	 * @pre tile < AIMap::GetMapSize().
	 * @exception AIError::ERR_AREA_NOT_CLEAR
	 * @exception AIError::ERR_TOO_CLOSE_TO_EDGE
	 * @exception AITile::ERR_TILE_TOO_HIGH
	 * @return 0 means failed, 1 means success.
	 */
	static bool RaiseTile(TileIndex tile, int32 slope);

	/**
	 * Lower the given corners of the tile. The corners can be combined,
	 *  for example: SLOPE_N | SLOPE_W (= SLOPE_NW) will lower the west and the north corner.
	 * @note The corners will be modified in the order west (first), south, east, north (last).
	 *       Changing one corner might cause another corner to be changed too. So modifiing
	 *       multiple corners may result in changing some corners by multiple steps.
	 * @param tile The tile to lower.
	 * @param slope Corners to lower (SLOPE_xxx).
	 * @pre tile < AIMap::GetMapSize().
	 * @exception AIError::ERR_AREA_NOT_CLEAR
	 * @exception AIError::ERR_TOO_CLOSE_TO_EDGE
	 * @exception AITile::ERR_TILE_TOO_LOW
	 * @return 0 means failed, 1 means success.
	 */
	static bool LowerTile(TileIndex tile, int32 slope);

	/**
	 * Level all tiles in the rectangle between start_tile and end_tile so they
	 *  are at the same height. All tiles will be raised or lowered until
	 *  they are at height AITile::GetHeight(start_tile).
	 * @param start_tile One corner of the rectangle to level.
	 * @param end_tile The opposite corner of the rectangle.
	 * @pre start_tile < AIMap::GetMapSize().
	 * @pre end_tile < AIMap::GetMapSize().
	 * @exception AIError::ERR_AREA_NOT_CLEAR
	 * @exception AIError::ERR_TOO_CLOSE_TO_EDGE
	 * @return True if one or more tiles were leveled.
	 * @note Even if leveling some part fails, some other part may have been
	 *  successfully leveled already.
	 * @note This function may return true in AITestMode, although it fails in
	 *  AIExecMode.
	 */
	static bool LevelTiles(TileIndex start_tile, TileIndex end_tile);

	/**
	 * Destroy everything on the given tile.
	 * @param tile The tile to demolish.
	 * @pre AIMap::IsValidTile(tile).
	 * @exception AIError::ERR_AREA_NOT_CLEAR
	 * @return True if and only if the tile was demolished.
	 */
	static bool DemolishTile(TileIndex tile);

	/**
	 * Create a random tree on a tile.
	 * @param tile The tile to build a tree on.
	 * @pre AIMap::IsValidTile(tile).
	 * @return True if and only if a tree was added on the tile.
	 */
	static bool PlantTree(TileIndex tile);

	/**
	 * Create a random tree on a rectangle of tiles.
	 * @param tile The top left tile of the rectangle.
	 * @param width The width of the rectangle.
	 * @param height The height of the rectangle.
	 * @pre AIMap::IsValidTile(tile).
	 * @pre width >= 1 && width <= 20.
	 * @pre height >= 1 && height <= 20.
	 * @return True if and only if a tree was added on any of the tiles in the rectangle.
	 */
	static bool PlantTreeRectangle(TileIndex tile, uint width, uint height);

	/**
	 * Find out if this tile is within the rating influence of a town.
	 *  Stations on this tile influence the rating of the town.
	 * @param tile The tile to check.
	 * @param town_id The town to check.
	 * @return True if the tile is within the rating influence of the town.
	 */
	static bool IsWithinTownInfluence(TileIndex tile, TownID town_id);

	/**
	 * Find the town that is closest to a tile. Stations you build at this tile
	 *  will belong to this town.
	 * @param tile The tile to check.
	 * @return The TownID of the town closest to the tile.
	 */
	static TownID GetClosestTown(TileIndex tile);

	/**
	 * Get the baseprice of building/clearing various tile-related things.
	 * @param build_type the type to build
	 * @return The baseprice of building or removing the given object.
	 */
	static Money GetBuildCost(BuildType build_type);
};

#endif /* AI_TILE_HPP */