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town_cmd.cpp File Reference

Handling of town tiles. More...

`#include "stdafx.h"`
`#include "road_internal.h"`
`#include "road_cmd.h"`
`#include "landscape.h"`
`#include "viewport_func.h"`
`#include "cmd_helper.h"`
`#include "command_func.h"`
`#include "industry.h"`
`#include "station_base.h"`
`#include "company_base.h"`
`#include "news_func.h"`
`#include "error.h"`
`#include "object.h"`
`#include "genworld.h"`
`#include "newgrf_debug.h"`
`#include "newgrf_house.h"`
`#include "newgrf_text.h"`
`#include "autoslope.h"`
`#include "tunnelbridge_map.h"`
`#include "strings_func.h"`
`#include "window_func.h"`
`#include "string_func.h"`
`#include "newgrf_cargo.h"`
`#include "cheat_type.h"`
`#include "animated_tile_func.h"`
`#include "date_func.h"`
`#include "subsidy_func.h"`
`#include "core/pool_func.hpp"`
`#include "town.h"`
`#include "townname_func.h"`
`#include "core/random_func.hpp"`
`#include "core/backup_type.hpp"`
`#include "depot_base.h"`
`#include "object_map.h"`
`#include "object_base.h"`
`#include "ai/ai.hpp"`
`#include "game/game.hpp"`
`#include "table/strings.h"`
`#include "table/town_land.h"`
`#include "safeguards.h"`

Go to the source code of this file.

## Data Structures
struct | SpotData
| Used as the user_data for FindFurthestFromWater. More...
struct | StatueBuildSearchData
| Structure for storing data while searching the best place to build a statue. More...

## Typedefs
typedef void | TownDrawTileProc (const TileInfo *ti)
typedef CommandCost | TownActionProc (Town *t, DoCommandFlag flags)

## Enumerations
enum | TownGrowthResult { GROWTH_SUCCEED = -1, GROWTH_SEARCH_STOPPED = 0 }

## Functions
static bool | BuildTownHouse (Town *t, TileIndex tile)
| Tries to build a house at this tile.
static Town * | CreateRandomTown (uint attempts, uint32 townnameparts, TownSize size, bool city, TownLayout layout)
static void | TownDrawHouseLift (const TileInfo *ti)
static DiagDirection | RandomDiagDir ()
| Return a random direction.
static void | DrawTile_Town (TileInfo *ti)
| House Tile drawing handler.
static int | GetSlopePixelZ_Town (TileIndex tile, uint x, uint y)
static Foundation | GetFoundation_Town (TileIndex tile, Slope tileh)
| Tile callback routine.
static void | AnimateTile_Town (TileIndex tile)
| Animate a tile for a town Only certain houses can be animated The newhouses animation supersedes regular ones.
static bool | IsCloseToTown (TileIndex tile, uint dist)
| Determines if a town is close to a tile.
void | UpdateAllTownVirtCoords ()
| Update the virtual coords needed to draw the town sign for all towns.
static void | ChangePopulation (Town *t, int mod)
| Change the towns population.
uint32 | GetWorldPopulation ()
| Determines the world population Basically, count population of all towns, one by one.
static void | MakeSingleHouseBigger (TileIndex tile)
| Helper function for house completion stages progression.
static void | MakeTownHouseBigger (TileIndex tile)
| Make the house advance in its construction stages until completion.
static void | TileLoop_Town (TileIndex tile)
| Tile callback function.
static CommandCost | ClearTile_Town (TileIndex tile, DoCommandFlag flags)
static void | AddProducedCargo_Town (TileIndex tile, CargoArray &produced)
static void | AddAcceptedCargoSetMask (CargoID cargo, uint amount, CargoArray &acceptance, uint32 *always_accepted)
static void | AddAcceptedCargo_Town (TileIndex tile, CargoArray &acceptance, uint32 *always_accepted)
static void | GetTileDesc_Town (TileIndex tile, TileDesc *td)
static TrackStatus | GetTileTrackStatus_Town (TileIndex tile, TransportType mode, uint sub_mode, DiagDirection side)
static void | ChangeTileOwner_Town (TileIndex tile, Owner old_owner, Owner new_owner)
void | UpdateTownCargoTotal (Town *t)
| Update the total cargo acceptance of the whole town.
static void | UpdateTownCargoes (Town *t, TileIndex start, bool update_total=true)
| Update accepted town cargoes around a specific tile.
void | UpdateTownCargoes (Town *t)
| Update cargo acceptance for the complete town.
void | UpdateTownCargoBitmap ()
| Updates the bitmap of all cargoes accepted by houses.
static bool | GrowTown (Town *t)
| Grow the town.
static void | TownTickHandler (Town *t)
void | OnTick_Town ()
static RoadBits | GetTownRoadBits (TileIndex tile)
| Return the RoadBits of a tile.
static bool | IsNeighborRoadTile (TileIndex tile, const DiagDirection dir, uint dist_multi)
| Check for parallel road inside a given distance.
static bool | IsRoadAllowedHere (Town *t, TileIndex tile, DiagDirection dir)
| Check if a Road is allowed on a given tile.
static bool | TerraformTownTile (TileIndex tile, int edges, int dir)
static void | LevelTownLand (TileIndex tile)
static RoadBits | GetTownRoadGridElement (Town *t, TileIndex tile, DiagDirection dir)
| Generate the RoadBits of a grid tile.
static bool | GrowTownWithExtraHouse (Town *t, TileIndex tile)
| Grows the town with an extra house.
static bool | GrowTownWithRoad (const Town *t, TileIndex tile, RoadBits rcmd)
| Grows the town with a road piece.
static bool | GrowTownWithBridge (const Town *t, const TileIndex tile, const DiagDirection bridge_dir)
| Grows the town with a bridge.
static void | GrowTownInTile (TileIndex *tile_ptr, RoadBits cur_rb, DiagDirection target_dir, Town *t1)
| Grows the given town.
static int | GrowTownAtRoad (Town *t, TileIndex tile)
| Returns "growth" if a house was built, or no if the build failed.
static RoadBits | GenRandomRoadBits ()
| Generate a random road block.
void | UpdateTownRadius (Town *t)
void | UpdateTownMaxPass (Town *t)
static void | DoCreateTown (Town *t, TileIndex tile, uint32 townnameparts, TownSize size, bool city, TownLayout layout, bool manual)
| Does the actual town creation.
static CommandCost | TownCanBePlacedHere (TileIndex tile)
| Checks if it's possible to place a town at given tile.
static bool | IsUniqueTownName (const char *name)
| Verifies this custom name is unique.
CommandCost | CmdFoundTown (TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
| Create a new town.
static TileIndex | AlignTileToGrid (TileIndex tile, TownLayout layout)
| Towns must all be placed on the same grid or when they eventually interpenetrate their road networks will not mesh nicely; this function adjusts a tile so that it aligns properly.
static bool | IsTileAlignedToGrid (TileIndex tile, TownLayout layout)
| Towns must all be placed on the same grid or when they eventually interpenetrate their road networks will not mesh nicely; this function tells you if a tile is properly aligned.
static bool | FindFurthestFromWater (TileIndex tile, void *user_data)
| CircularTileSearch callback; finds the tile furthest from any water.
static bool | FindNearestEmptyLand (TileIndex tile, void *user_data)
| CircularTileSearch callback; finds the nearest land tile.
static TileIndex | FindNearestGoodCoastalTownSpot (TileIndex tile, TownLayout layout)
| Given a spot on the map (presumed to be a water tile), find a good coastal spot to build a city.
bool | GenerateTowns (TownLayout layout)
| This function will generate a certain amount of towns, with a certain layout It can be called from the scenario editor (i.e.
HouseZonesBits | GetTownRadiusGroup (const Town *t, TileIndex tile)
| Returns the bit corresponding to the town zone of the specified tile.
static void | ClearMakeHouseTile (TileIndex tile, Town *t, byte counter, byte stage, HouseID type, byte random_bits)
| Clears tile and builds a house or house part.
static void | MakeTownHouse (TileIndex t, Town *town, byte counter, byte stage, HouseID type, byte random_bits)
| Write house information into the map.
static bool | CanBuildHouseHere (TileIndex tile, TownID town, bool noslope)
| Checks if a house can be built here.
static bool | CheckBuildHouseSameZ (TileIndex tile, TownID town, int z, bool noslope)
| Checks if a house can be built at this tile, must have the same max z as parameter.
static bool | CheckFree2x2Area (TileIndex tile, TownID town, int z, bool noslope)
| Checks if a house of size 2x2 can be built at this tile.
static bool | TownLayoutAllowsHouseHere (Town *t, TileIndex tile)
| Checks if current town layout allows building here.
static bool | TownLayoutAllows2x2HouseHere (Town *t, TileIndex tile)
| Checks if current town layout allows 2x2 building here.
static bool | CheckTownBuild2House (TileIndex *tile, Town *t, int maxz, bool noslope, DiagDirection second)
| Checks if 1x2 or 2x1 building is allowed here, also takes into account current town layout Also, tests both building positions that occupy this tile.
static bool | CheckTownBuild2x2House (TileIndex *tile, Town *t, int maxz, bool noslope)
| Checks if 2x2 building is allowed here, also takes into account current town layout Also, tests all four building positions that occupy this tile.
static void | DoClearTownHouseHelper (TileIndex tile, Town *t, HouseID house)
| Update data structures when a house is removed.
TileIndexDiff | GetHouseNorthPart (HouseID &house)
| Determines if a given HouseID is part of a multitile house.
void | ClearTownHouse (Town *t, TileIndex tile)
CommandCost | CmdRenameTown (TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
| Rename a town (server-only).
const CargoSpec * | FindFirstCargoWithTownEffect (TownEffect effect)
| Determines the first cargo with a certain town effect.
static void | UpdateTownGrowRate (Town *t)
CommandCost | CmdTownCargoGoal (TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
| Change the cargo goal of a town.
CommandCost | CmdTownSetText (TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
| Set a custom text in the Town window.
CommandCost | CmdTownGrowthRate (TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
| Change the growth rate of the town.
CommandCost | CmdExpandTown (TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
| Expand a town (scenario editor only).
CommandCost | CmdDeleteTown (TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
| Delete a town (scenario editor or worldgen only).
static CommandCost | TownActionAdvertiseSmall (Town *t, DoCommandFlag flags)
static CommandCost | TownActionAdvertiseMedium (Town *t, DoCommandFlag flags)
static CommandCost | TownActionAdvertiseLarge (Town *t, DoCommandFlag flags)
static CommandCost | TownActionRoadRebuild (Town *t, DoCommandFlag flags)
static bool | TryClearTile (TileIndex tile)
| Check whether the land can be cleared.
static bool | SearchTileForStatue (TileIndex tile, void *user_data)
| Search callback function for TownActionBuildStatue.
static CommandCost | TownActionBuildStatue (Town *t, DoCommandFlag flags)
| Perform a 9x9 tiles circular search from the center of the town in order to find a free tile to place a statue.
static CommandCost | TownActionFundBuildings (Town *t, DoCommandFlag flags)
static CommandCost | TownActionBuyRights (Town *t, DoCommandFlag flags)
static CommandCost | TownActionBribe (Town *t, DoCommandFlag flags)
uint | GetMaskOfTownActions (int *nump, CompanyID cid, const Town *t)
| Get a list of available actions to do at a town.
CommandCost | CmdDoTownAction (TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
| Do a town action.
static void | UpdateTownRating (Town *t)
static void | UpdateTownAmounts (Town *t)
static void | UpdateTownUnwanted (Town *t)
CommandCost | CheckIfAuthorityAllowsNewStation (TileIndex tile, DoCommandFlag flags)
| Checks whether the local authority allows construction of a new station (rail, road, airport, dock) on the given tile.
Town * | CalcClosestTownFromTile (TileIndex tile, uint threshold)
| Return the town closest to the given tile within threshold.
Town * | ClosestTownFromTile (TileIndex tile, uint threshold)
| Return the town closest (in distance or ownership) to a given tile, within a given threshold.
void | SetTownRatingTestMode (bool mode)
| Switch the town rating to test-mode, to allow commands to be tested without affecting current ratings.
static int | GetRating (const Town *t)
| Get the rating of a town for the _current_company.
void | ChangeTownRating (Town *t, int add, int max, DoCommandFlag flags)
| Changes town rating of the current company.
CommandCost | CheckforTownRating (DoCommandFlag flags, Town *t, TownRatingCheckType type)
| Does the town authority allow the (destructive) action of the current company?
void | TownsMonthlyLoop ()
void | TownsYearlyLoop ()
static CommandCost | TerraformTile_Town (TileIndex tile, DoCommandFlag flags, int z_new, Slope tileh_new)
void | ResetHouses ()

## Variables
TownID | _new_town_id
uint32 | _town_cargoes_accepted
| Bitmap of all cargoes accepted by houses.
TownPool | _town_pool ("Town")
static int | _grow_town_result
static TownDrawTileProc *const | _town_draw_tile_procs [1]
static const byte | _num_initial_towns [4] = {5, 11, 23, 46}
const byte | _town_action_costs [TACT_COUNT]
| Factor in the cost of each town action.
static TownActionProc *const | _town_action_proc []
static bool | _town_rating_test = false
| If `true`, town rating is in test-mode.
static SmallMap< const Town *, int, 4 > | _town_test_ratings
| Map of towns to modified ratings, while in town rating test-mode.
const TileTypeProcs | _tile_type_town_procs
| Tile callback functions for a town.
HouseSpec | _house_specs [NUM_HOUSES]

## Detailed Description

Handling of town tiles.

Definition in file town_cmd.cpp.

## Function Documentation

static TileIndex AlignTileToGrid | ( | TileIndex | tile,
|  | TownLayout | layout
| ) |  |
| static

Towns must all be placed on the same grid or when they eventually interpenetrate their road networks will not mesh nicely; this function adjusts a tile so that it aligns properly.

Parameters

  tile | the tile to start at
  layout | which town layout algo is in effect

Returns
  the adjusted tile

Definition at line 1740 of file town_cmd.cpp.

References TileX(), TileXY(), TileY(), TL_2X2_GRID, and TL_3X3_GRID.

static void AnimateTile_Town | ( | TileIndex | tile | ) |
| static

Animate a tile for a town Only certain houses can be animated The newhouses animation supersedes regular ones.

Parameters

  tile | TileIndex of the house to animate

Definition at line 291 of file town_cmd.cpp.

References _tick_counter, DeleteAnimatedTile(), GetHouseType(), GetLiftDestination(), GetLiftPosition(), HaltLift(), LiftHasDestination(), MarkTileDirtyByTile(), NEW_HOUSE_OFFSET, RandomRange(), SetLiftDestination(), and SetLiftPosition().

static bool BuildTownHouse | ( | Town * | t,
|  | TileIndex | tile
| ) |  |
| static

Tries to build a house at this tile.

Parameters

  t | town the house will belong to
  tile | where the house will be built

Returns
  false iff no house can be built at this tile

Definition at line 2197 of file town_cmd.cpp.

References _cur_year, _generating_world, _loaded_newgrf_features, _settings_game, HouseSpec::building_availability, TownCache::building_counts, HouseSpec::building_flags, BUILDING_IS_HISTORICAL, Town::cache, CALLBACK_FAILED, HouseSpec::callback_mask, CanBuildHouseHere(), CBID_HOUSE_ALLOW_CONSTRUCTION, CBM_HOUSE_ALLOW_CONSTRUCTION, Chance16(), ChangePopulation(), CheckTownBuild2House(), CheckTownBuild2x2House(), HouseSpec::class_id, Convert8bitBooleanCallback(), DIAGDIR_SE, DIAGDIR_SW, HouseSpec::enabled, HouseSpec::extra_flags, Town::flags, GameSettings::game_creation, GB(), GetTileMaxZ(), GetTileSlope(), GetTownRadiusGroup(), HouseSpec::grf_prop, GRFFilePropsBase< Tcnt >::grffile, GRFLoadedFeatures::has_newhouses, HasBit(), HighestSnowLine(), Pool< Titem, Tindex, Tgrowth_step, Tmax_size, Tpool_type, Tcache, Tzero >::PoolItem< Tpool >::index, GameCreationSettings::landscape, MakeTownHouse(), HouseSpec::max_year, NUM_HOUSES, TownCache::num_houses, GRFFileProps::override, HouseSpec::population, HouseSpec::probability, RandomRange(), SetBit(), SLOPE_FLAT, TOWN_HAS_CHURCH, TOWN_HAS_STADIUM, TOWN_HOUSE_COMPLETED, TownLayoutAllowsHouseHere(), and UpdateTownCargoes().

Referenced by GrowTownInTile(), GrowTownWithExtraHouse(), and TileLoop_Town().

Town* CalcClosestTownFromTile | ( | TileIndex | tile,
|  | uint | threshold
| ) |  |

Return the town closest to the given tile within threshold.

Parameters

  tile | Starting point of the search.
  threshold | Biggest allowed distance to the town.

Returns
  Closest town to tile within threshold, or `NULL` if there is no such town.

Note
  This function only uses distance, the ClosestTownFromTile function also takes town ownership into account.

Definition at line 3169 of file town_cmd.cpp.

References DistanceManhattan(), and Town::xy.

Referenced by AfterLoadGame(), BuildObject(), ClosestTownFromTile(), CmdBuildBridge(), CmdBuildRoad(), CmdBuildTunnel(), Town::PostDestructor(), RemoveRoad(), and UpdateNearestTownForRoadTiles().

static bool CanBuildHouseHere | ( | TileIndex | tile,
|  | TownID | town,
|  | bool | noslope
| ) |  |
| inline static

Checks if a house can be built here.

Important is slope, bridge above and ability to clear the land.

Parameters

  tile | tile to check
  town | town that is checking
  noslope | are slopes (foundations) allowed?

Returns
  true iff house can be built here

Definition at line 2014 of file town_cmd.cpp.

References CMD_LANDSCAPE_CLEAR, DC_NO_WATER, DoCommand(), GetTileSlope(), GetTownIndex(), IsBridgeAbove(), IsSteepSlope(), IsTileType(), MP_HOUSE, SLOPE_FLAT, and CommandCost::Succeeded().

Referenced by BuildTownHouse(), and CheckBuildHouseSameZ().

static void ChangePopulation | ( | Town * | t,
|  | int | mod
| ) |  |
| static

Change the towns population.

Parameters

  t | Town which population has changed
  mod | population change (can be positive or negative)

Definition at line 400 of file town_cmd.cpp.

References Town::cache, Pool< Titem, Tindex, Tgrowth_step, Tmax_size, Tpool_type, Tcache, Tzero >::PoolItem< Tpool >::index, InvalidateWindowData(), TownCache::population, Town::UpdateVirtCoord(), WC_TOWN_DIRECTORY, and WC_TOWN_VIEW.

Referenced by BuildTownHouse(), and MakeSingleHouseBigger().

void ChangeTownRating | ( | Town * | t,
|  | int | add,
|  | int | max,
|  | DoCommandFlag | flags
| ) |  |

Changes town rating of the current company.

Parameters

  t | Town to affect
  add | Value to add
  max | Minimum (add < 0) resp. maximum (add > 0) rating that should be achievable with this change.
  flags | Command flags, especially DC_NO_MODIFY_TOWN_RATING is tested

Definition at line 3273 of file town_cmd.cpp.

References _cheats, _current_company, DC_NO_MODIFY_TOWN_RATING, GetRating(), Town::have_ratings, Pool< Titem, Tindex, Tgrowth_step, Tmax_size, Tpool_type, Tcache, Tzero >::PoolItem< Tpool >::index, Pool< Titem, Tindex, Tgrowth_step, Tmax_size, Tpool_type, Tcache, Tzero >::PoolItem<&_company_pool >::IsValidID(), Cheats::magic_bulldozer, max(), Town::ratings, SetBit(), SetWindowDirty(), Cheat::value, and WC_TOWN_AUTHORITY.

Referenced by CheckAllowRemoveRoad(), CmdPlantTree(), DoClearBridge(), and DoClearTunnel().

static bool CheckBuildHouseSameZ | ( | TileIndex | tile,
|  | TownID | town,
|  | int | z,
|  | bool | noslope
| ) |  |
| inline static

Checks if a house can be built at this tile, must have the same max z as parameter.

Parameters

  tile | tile to check
  town | town that is checking
  z | max z of this tile so more parts of a house are at the same height (with foundation)
  noslope | are slopes (foundations) allowed?

Returns
  true iff house can be built here

See Also
  CanBuildHouseHere()

Definition at line 2040 of file town_cmd.cpp.

References CanBuildHouseHere(), and GetTileMaxZ().

Referenced by CheckFree2x2Area(), and CheckTownBuild2House().

CommandCost CheckforTownRating | ( | DoCommandFlag | flags,
|  | Town * | t,
|  | TownRatingCheckType | type
| ) |  |

Does the town authority allow the (destructive) action of the current company?

Parameters

  flags | Checking flags of the command.
  t | Town that must allow the company action.
  type | Type of action that is wanted.

Returns
  A succeeded command if the action is allowed, a failed command if it is not allowed.

Definition at line 3310 of file town_cmd.cpp.

References _cheats, _current_company, _settings_game, DC_NO_TEST_TOWN_RATING, GameSettings::difficulty, GetRating(), Pool< Titem, Tindex, Tgrowth_step, Tmax_size, Tpool_type, Tcache, Tzero >::PoolItem< Tpool >::index, Pool< Titem, Tindex, Tgrowth_step, Tmax_size, Tpool_type, Tcache, Tzero >::PoolItem<&_company_pool >::IsValidID(), Cheats::magic_bulldozer, RATING_ROAD_NEEDED_HOSTILE, RATING_ROAD_NEEDED_NEUTRAL, RATING_ROAD_NEEDED_PERMISSIVE, RATING_TUNNEL_BRIDGE_NEEDED_HOSTILE, RATING_TUNNEL_BRIDGE_NEEDED_NEUTRAL, RATING_TUNNEL_BRIDGE_NEEDED_PERMISSIVE, return_cmd_error, SetDParam(), DifficultySettings::town_council_tolerance, TOWN_RATING_CHECK_TYPE_COUNT, and Cheat::value.

Referenced by CheckAllowRemoveRoad(), DoClearBridge(), and DoClearTunnel().

static bool CheckFree2x2Area | ( | TileIndex | tile,
|  | TownID | town,
|  | int | z,
|  | bool | noslope
| ) |  |
| static

Checks if a house of size 2x2 can be built at this tile.

Parameters

  tile | tile, N corner
  town | town that is checking
  z | maximum tile z so all tile have the same max z
  noslope | are slopes (foundations) allowed?

Returns
  true iff house can be built

See Also
  CheckBuildHouseSameZ()

Definition at line 2060 of file town_cmd.cpp.

References CheckBuildHouseSameZ(), DIAGDIR_END, DIAGDIR_SE, and TileOffsByDiagDir().

Referenced by CheckTownBuild2x2House().

CommandCost CheckIfAuthorityAllowsNewStation | ( | TileIndex | tile,
|  | DoCommandFlag | flags
| ) |  |

Checks whether the local authority allows construction of a new station (rail, road, airport, dock) on the given tile.

Parameters

  tile | The tile where the station shall be constructed.
  flags | Command flags. DC_NO_TEST_TOWN_RATING is tested.

Returns
  Succeeded or failed command.

Definition at line 3148 of file town_cmd.cpp.

References _current_company, _settings_game, ClosestTownFromTile(), DC_NO_TEST_TOWN_RATING, EconomySettings::dist_local_authority, GameSettings::economy, Pool< Titem, Tindex, Tgrowth_step, Tmax_size, Tpool_type, Tcache, Tzero >::PoolItem< Tpool >::index, Pool< Titem, Tindex, Tgrowth_step, Tmax_size, Tpool_type, Tcache, Tzero >::PoolItem<&_company_pool >::IsValidID(), Town::ratings, return_cmd_error, and SetDParam().

Referenced by CmdBuildAirport(), CmdBuildDock(), CmdBuildRailStation(), and CmdBuildRoadStop().

static bool CheckTownBuild2House | ( | TileIndex * | tile,
|  | Town * | t,
|  | int | maxz,
|  | bool | noslope,
|  | DiagDirection | second
| ) |  |
| static

Checks if 1x2 or 2x1 building is allowed here, also takes into account current town layout Also, tests both building positions that occupy this tile.

Parameters

  tile | tile where the building should be built
  t | town
  maxz | all tiles should have the same height
  noslope | are slopes forbidden?
  second | diagdir from first tile to second tile

Definition at line 2149 of file town_cmd.cpp.

References CheckBuildHouseSameZ(), Pool< Titem, Tindex, Tgrowth_step, Tmax_size, Tpool_type, Tcache, Tzero >::PoolItem< Tpool >::index, ReverseDiagDir(), TileOffsByDiagDir(), and TownLayoutAllowsHouseHere().

Referenced by BuildTownHouse().

static bool CheckTownBuild2x2House | ( | TileIndex * | tile,
|  | Town * | t,
|  | int | maxz,
|  | bool | noslope
| ) |  |
| static

Checks if 2x2 building is allowed here, also takes into account current town layout Also, tests all four building positions that occupy this tile.

Parameters

  tile | tile where the building should be built
  t | town
  maxz | all tiles should have the same height
  noslope | are slopes forbidden?

Definition at line 2174 of file town_cmd.cpp.

References CheckFree2x2Area(), DIAGDIR_END, DIAGDIR_SE, Pool< Titem, Tindex, Tgrowth_step, Tmax_size, Tpool_type, Tcache, Tzero >::PoolItem< Tpool >::index, ReverseDiagDir(), TileOffsByDiagDir(), and TownLayoutAllows2x2HouseHere().

Referenced by BuildTownHouse().

static void ClearMakeHouseTile | ( | TileIndex | tile,
|  | Town * | t,
|  | byte | counter,
|  | byte | stage,
|  | HouseID | type,
|  | byte | random_bits
| ) |  |
| inline static

Clears tile and builds a house or house part.

Parameters

  tile | tile index
  t | The town to clear the house for
  counter | of construction step
  stage | of construction (used for drawing)
  type | of house. Index into house specs array
  random_bits | required for newgrf houses

Precondition
  house can be built here

Definition at line 1971 of file town_cmd.cpp.

References AddAnimatedTile(), CMD_LANDSCAPE_CLEAR, DC_EXEC, DC_NO_WATER, DoCommand(), IncreaseBuildingCount(), Pool< Titem, Tindex, Tgrowth_step, Tmax_size, Tpool_type, Tcache, Tzero >::PoolItem< Tpool >::index, MakeHouseTile(), MarkTileDirtyByTile(), and CommandCost::Succeeded().

Referenced by MakeTownHouse().

Town* ClosestTownFromTile | ( | TileIndex | tile,
|  | uint | threshold
| ) |  |

Return the town closest (in distance or ownership) to a given tile, within a given threshold.

Parameters

  tile | Starting point of the search.
  threshold | Biggest allowed distance to the town.

Returns
  Closest town to tile within threshold, or `NULL` if there is no such town.

Note
  If you only care about distance, you can use the CalcClosestTownFromTile function.

Definition at line 3194 of file town_cmd.cpp.

References _generating_world, CalcClosestTownFromTile(), DistanceManhattan(), Pool< Titem, Tindex, Tgrowth_step, Tmax_size, Tpool_type, Tcache, Tzero >::PoolItem<&_town_pool >::Get(), Pool< Titem, Tindex, Tgrowth_step, Tmax_size, Tpool_type, Tcache, Tzero >::PoolItem<&_town_pool >::GetNumItems(), GetTileType(), GetTownIndex(), HasTownOwnedRoad(), IsRoadDepot(), Pool< Titem, Tindex, Tgrowth_step, Tmax_size, Tpool_type, Tcache, Tzero >::PoolItem<&_town_pool >::IsValidID(), MP_HOUSE, MP_ROAD, and Town::xy.

Referenced by AfterLoadGame(), BuildStationPart(), CheckAllowRemoveRoad(), CheckIfAuthorityAllowsNewStation(), CheckIfCallBackAllowsCreation(), CmdBuildAirport(), CmdBuildBridge(), CmdDeleteTown(), CmdPlantTree(), CmdRemoveRoadStop(), DisasterTick_Big_Ufo(), DoClearBridge(), DoClearTunnel(), FindTownForIndustry(), GenerateCompanyName(), GetNameOfOwner(), IndustriesResolverObject::GetTown(), StationResolverObject::GetTown(), ObjectResolverObject::GetTown(), IndustryTileScopeResolver::GetVariable(), RailTypeScopeResolver::GetVariable(), AirportTileScopeResolver::GetVariable(), ObjectScopeResolver::GetVariable(), MakeDefaultName(), LandInfoWindow::OnInit(), and Town::~Town().

CommandCost CmdDeleteTown | ( | TileIndex | tile,
|  | DoCommandFlag | flags,
|  | uint32 | p1,
|  | uint32 | p2,
|  | const char * | text
| ) |  |

Delete a town (scenario editor or worldgen only).

Parameters

  tile | Unused.
  flags | Type of operation.
  p1 | Town ID to delete.
  p2 | Unused.
  text | Unused.

Returns
  Empty cost or an error.

Definition at line 2624 of file town_cmd.cpp.

References _generating_world, Station::airport, AT_OILRIG, ClosestTownFromTile(), CMD_ERROR, CMD_LANDSCAPE_CLEAR, DC_EXEC, DoCommand(), FACIL_AIRPORT, BaseStation::facilities, CommandCost::Failed(), Object::GetByTile(), Industry::GetByTile(), Pool< Titem, Tindex, Tgrowth_step, Tmax_size, Tpool_type, Tcache, Tzero >::PoolItem<&_town_pool >::GetIfValid(), Pool< Titem, Tindex, Tgrowth_step, Tmax_size, Tpool_type, Tcache, Tzero >::PoolItem<&_town_pool >::GetNumItems(), GetTileType(), GetTownIndex(), HasTownOwnedRoad(), Pool< Titem, Tindex, Tgrowth_step, Tmax_size, Tpool_type, Tcache, Tzero >::PoolItem< Tpool >::index, IsTileOwner(), MapSize(), MP_HOUSE, MP_INDUSTRY, MP_OBJECT, MP_ROAD, MP_TUNNELBRIDGE, OBJECT_STATUE, OWNER_TOWN, OrthogonalTileArea::tile, Object::town, Industry::town, BaseStation::town, Object::type, and Airport::type.

CommandCost CmdDoTownAction | ( | TileIndex | tile,
|  | DoCommandFlag | flags,
|  | uint32 | p1,
|  | uint32 | p2,
|  | const char * | text
| ) |  |

Do a town action.

This performs an action such as advertising, building a statue, funding buildings, but also bribing the town-council

Parameters

  tile | unused
  flags | type of operation
  p1 | town to do the action at
  p2 | action to perform,

See Also
  _town_action_proc for the list of available actions

Parameters

  text | unused

Returns
  the cost of this operation or an error

Definition at line 2997 of file town_cmd.cpp.

References _current_company, CMD_ERROR, EXPENSES_OTHER, CommandCost::Failed(), Pool< Titem, Tindex, Tgrowth_step, Tmax_size, Tpool_type, Tcache, Tzero >::PoolItem<&_town_pool >::GetIfValid(), GetMaskOfTownActions(), HasBit(), lengthof, SetWindowDirty(), and WC_TOWN_AUTHORITY.

CommandCost CmdExpandTown | ( | TileIndex | tile,
|  | DoCommandFlag | flags,
|  | uint32 | p1,
|  | uint32 | p2,
|  | const char * | text
| ) |  |

Expand a town (scenario editor only).

Parameters

  tile | Unused.
  flags | Type of operation.
  p1 | Town ID to expand.
  p2 | Amount to grow, or 0 to grow a random size up to the current amount of houses.
  text | Unused.

Returns
  Empty cost or an error.

Definition at line 2584 of file town_cmd.cpp.

References _current_company, Town::cache, ClampToU16(), CMD_ERROR, DC_EXEC, Pool< Titem, Tindex, Tgrowth_step, Tmax_size, Tpool_type, Tcache, Tzero >::PoolItem<&_town_pool >::GetIfValid(), GrowTown(), TownCache::num_houses, OWNER_DEITY, and RandomRange().

CommandCost CmdFoundTown | ( | TileIndex | tile,
|  | DoCommandFlag | flags,
|  | uint32 | p1,
|  | uint32 | p2,
|  | const char * | text
| ) |  |

Create a new town.

Parameters

  tile | coordinates where town is built
  flags | type of operation
  p1 | 0..1 size of the town (

See Also
  TownSize) 2 true iff it should be a city 3..5 town road layout (
  TownLayout) 6 use random location (randomize `tile` )

Parameters

  p2 | town name parts
  text | Custom name for the town. If empty, the town name parts will be used.

Returns
  the cost of this operation or an error

Definition at line 1632 of file town_cmd.cpp.

References _current_company, _generating_world, _settings_game, AI::BroadcastNewEvent(), Pool< Titem, Tindex, Tgrowth_step, Tmax_size, Tpool_type, Tcache, Tzero >::PoolItem<&_town_pool >::CanAllocateItem(), CMD_ERROR, DC_EXEC, DoCreateTown(), GameSettings::economy, EXPENSES_OTHER, CommandCost::Failed(), EconomySettings::found_town, GameSettings::game_creation, GetAvailableMoneyForCommand(), CommandCost::GetCost(), HasBit(), Pool< Titem, Tindex, Tgrowth_step, Tmax_size, Tpool_type, Tcache, Tzero >::PoolItem< Tpool >::index, IsUniqueTownName(), lastof, lengthof, MAX_CHAR_LENGTH, MAX_LENGTH_COMPANY_NAME_CHARS, MAX_LENGTH_TOWN_NAME_CHARS, CommandCost::MultiplyCost(), Town::name, Game::NewEvent(), NT_INDUSTRY_OPEN, NUM_TLS, OWNER_DEITY, Backup< T >::Restore(), return_cmd_error, SetDParam(), SetDParamStr(), stredup(), StrEmpty(), TF_CUSTOM_LAYOUT, TF_FORBIDDEN, EconomySettings::town_layout, GameCreationSettings::town_name, TownCanBePlacedHere(), TSZ_END, TSZ_LARGE, TSZ_RANDOM, UpdateNearestTownForRoadTiles(), Town::UpdateVirtCoord(), Utf8StringLength(), and VerifyTownName().

CommandCost CmdRenameTown | ( | TileIndex | tile,
|  | DoCommandFlag | flags,
|  | uint32 | p1,
|  | uint32 | p2,
|  | const char * | text
| ) |  |

Rename a town (server-only).

Parameters

  tile | unused
  flags | type of operation
  p1 | town ID to rename
  p2 | unused
  text | the new name or an empty string when resetting to the default

Returns
  the cost of this operation or an error

Definition at line 2437 of file town_cmd.cpp.

References CMD_ERROR, DC_EXEC, free(), Pool< Titem, Tindex, Tgrowth_step, Tmax_size, Tpool_type, Tcache, Tzero >::PoolItem<&_town_pool >::GetIfValid(), InvalidateWindowData(), IsUniqueTownName(), MAX_LENGTH_TOWN_NAME_CHARS, Town::name, return_cmd_error, stredup(), StrEmpty(), UpdateAllStationVirtCoords(), Town::UpdateVirtCoord(), Utf8StringLength(), and WC_TOWN_DIRECTORY.

CommandCost CmdTownCargoGoal | ( | TileIndex | tile,
|  | DoCommandFlag | flags,
|  | uint32 | p1,
|  | uint32 | p2,
|  | const char * | text
| ) |  |

Change the cargo goal of a town.

Parameters

  tile | Unused.
  flags | Type of operation.
  p1 | various bitstuffed elements p1 = (bit 0 - 15) - Town ID to cargo game of. p1 = (bit 16 - 23) - TownEffect to change the game of.
  p2 | The new goal value.
  text | Unused.

Returns
  Empty cost or an error.

Definition at line 2487 of file town_cmd.cpp.

References _current_company, CMD_ERROR, DC_EXEC, FindFirstCargoWithTownEffect(), GB(), Pool< Titem, Tindex, Tgrowth_step, Tmax_size, Tpool_type, Tcache, Tzero >::PoolItem<&_town_pool >::GetIfValid(), Town::goal, InvalidateWindowData(), OWNER_DEITY, TE_END, UpdateTownGrowRate(), and WC_TOWN_VIEW.

CommandCost CmdTownGrowthRate | ( | TileIndex | tile,
|  | DoCommandFlag | flags,
|  | uint32 | p1,
|  | uint32 | p2,
|  | const char * | text
| ) |  |

Change the growth rate of the town.

Parameters

  tile | Unused.
  flags | Type of operation.
  p1 | Town ID to cargo game of.
  p2 | Amount of days between growth, or TOWN_GROW_RATE_CUSTOM_NONE, or 0 to reset custom growth rate.
  text | Unused.

Returns
  Empty cost or an error.

Definition at line 2544 of file town_cmd.cpp.

References _current_company, CMD_ERROR, DC_EXEC, GB(), Pool< Titem, Tindex, Tgrowth_step, Tmax_size, Tpool_type, Tcache, Tzero >::PoolItem<&_town_pool >::GetIfValid(), Town::grow_counter, Town::growth_rate, InvalidateWindowData(), OWNER_DEITY, TOWN_GROW_RATE_CUSTOM, TOWN_GROW_RATE_CUSTOM_NONE, UpdateTownGrowRate(), and WC_TOWN_VIEW.

CommandCost CmdTownSetText | ( | TileIndex | tile,
|  | DoCommandFlag | flags,
|  | uint32 | p1,
|  | uint32 | p2,
|  | const char * | text
| ) |  |

Set a custom text in the Town window.

Parameters

  tile | Unused.
  flags | Type of operation.
  p1 | Town ID to change the text of.
  p2 | Unused.
  text | The new text (empty to remove the text).

Returns
  Empty cost or an error.

Definition at line 2520 of file town_cmd.cpp.

References _current_company, CMD_ERROR, DC_EXEC, free(), Pool< Titem, Tindex, Tgrowth_step, Tmax_size, Tpool_type, Tcache, Tzero >::PoolItem<&_town_pool >::GetIfValid(), InvalidateWindowData(), OWNER_DEITY, stredup(), StrEmpty(), Town::text, and WC_TOWN_VIEW.

static void DoClearTownHouseHelper | ( | TileIndex | tile,
|  | Town * | t,
|  | HouseID | house
| ) |  |
| static

Update data structures when a house is removed.

Parameters

  tile | Tile of the house
  t | Town owning the house
  house | House type

Definition at line 2353 of file town_cmd.cpp.

References DecreaseBuildingCount(), DeleteAnimatedTile(), DeleteNewGRFInspectWindow(), IsTileType(), and MP_HOUSE.

static void DoCreateTown | ( | Town * | t,
|  | TileIndex | tile,
|  | uint32 | townnameparts,
|  | TownSize | size,
|  | bool | city,
|  | TownLayout | layout,
|  | bool | manual
| ) |  |
| static

Does the actual town creation.

Parameters

  t | The town
  tile | Where to put it
  townnameparts | The town name
  size | Parameter for size determination
  city | whether to build a city or town
  layout | the (road) layout of the town
  manual | was the town placed manually?

Definition at line 1509 of file town_cmd.cpp.

References _nb_orig_names, _settings_game, Town::cache, GameSettings::economy, Town::exclusive_counter, Town::exclusivity, FindFirstCargoWithTownEffect(), Town::flags, Town::fund_buildings_months, GameSettings::game_creation, Town::goal, Town::grow_counter, Town::growth_rate, GrowTown(), Town::have_ratings, EconomySettings::initial_city_size, Town::InitializeLayout(), INVALID_COMPANY, InvalidateWindowData(), GameCreationSettings::landscape, Town::larger_town, MAX_COMPANIES, TownCache::num_houses, TownCache::population, RATING_INITIAL, Town::ratings, Town::statues, TE_FOOD, TE_WATER, Town::time_until_rebuild, TOWN_GROWTH_DESERT, TOWN_GROWTH_WINTER, GameCreationSettings::town_name, TSZ_RANDOM, UpdateAirportsNoise(), Town::UpdateVirtCoord(), WC_TOWN_DIRECTORY, and Town::xy.

Referenced by CmdFoundTown().

static void DrawTile_Town | ( | TileInfo * | ti | ) |
| static

House Tile drawing handler.

Part of the tile loop process

Parameters

  ti | TileInfo of the tile to draw

Definition at line 212 of file town_cmd.cpp.

References _town_draw_tile_data, AddSortableSpriteToDraw(), DrawFoundation(), DrawGroundSprite(), FOUNDATION_LEVELED, GetHouseBuildingStage(), GetHouseType(), HouseSpec::grf_prop, IsInvisibilitySet(), IsTransparencySet(), NEW_HOUSE_OFFSET, PalSpriteID::pal, SLOPE_FLAT, PalSpriteID::sprite, TileInfo::tile, TileInfo::tileh, TileHash2Bit(), TO_HOUSES, TileInfo::x, TileInfo::y, and TileInfo::z.

const CargoSpec* FindFirstCargoWithTownEffect | ( | TownEffect | effect | ) |

Determines the first cargo with a certain town effect.

Parameters

  effect | Town effect of interest

Returns
  first active cargo slot with that effect

Definition at line 2465 of file town_cmd.cpp.

References CargoSpec::town_effect.

Referenced by AfterLoadGame(), CmdTownCargoGoal(), DoCreateTown(), and TownViewWindow::DrawWidget().

static bool FindFurthestFromWater | ( | TileIndex | tile,
|  | void * | user_data
| ) |  |
| static

CircularTileSearch callback; finds the tile furthest from any water.

slightly bit tricky, since it has to do a search of its own in order to find the distance to the water from each square in the radius.

Also, this never returns true, because it needs to take into account all locations being searched before it knows which is the furthest.

Parameters

  tile | Start looking from this tile
  user_data | Storage area for data that must last across calls; must be a pointer to struct SpotData

Returns
  always false

Definition at line 1792 of file town_cmd.cpp.

References GetClosestWaterDistance(), IsTileAlignedToGrid(), IsTileFlat(), IsTileType(), SpotData::layout, SpotData::max_dist, MP_CLEAR, and SpotData::tile.

Referenced by FindNearestGoodCoastalTownSpot().

static bool FindNearestEmptyLand | ( | TileIndex | tile,
|  | void * | user_data
| ) |  |
| static

CircularTileSearch callback; finds the nearest land tile.

Parameters

  tile | Start looking from this tile
  user_data | not used

Definition at line 1814 of file town_cmd.cpp.

References IsTileType(), and MP_CLEAR.

Referenced by FindNearestGoodCoastalTownSpot().

static TileIndex FindNearestGoodCoastalTownSpot | ( | TileIndex | tile,
|  | TownLayout | layout
| ) |  |
| static

Given a spot on the map (presumed to be a water tile), find a good coastal spot to build a city.

We don't want to build too close to the edge if we can help it (since that retards city growth) hence the search within a search within a search. O(n*m^2), where n is how far to search for land, and m is how far inland to look for a flat spot.

Parameters

  tile | Start looking from this spot.
  layout | the road layout to search for

Returns
  tile that was found

Definition at line 1831 of file town_cmd.cpp.

References CircularTileSearch(), FindFurthestFromWater(), FindNearestEmptyLand(), INVALID_TILE, and SpotData::tile.

bool GenerateTowns | ( | TownLayout | layout | ) |

This function will generate a certain amount of towns, with a certain layout It can be called from the scenario editor (i.e.

: generate Random Towns) as well as from world creation.

Parameters

  layout | which towns will be set to, when created

Returns
  true if towns have been successfully created

Definition at line 1898 of file town_cmd.cpp.

References _settings_game, Chance16(), GameCreationSettings::custom_town_number, CUSTOM_TOWN_NUMBER_DIFFICULTY, GameSettings::difficulty, GameSettings::economy, GameSettings::game_creation, GenerateTownName(), Pool< Titem, Tindex, Tgrowth_step, Tmax_size, Tpool_type, Tcache, Tzero >::PoolItem<&_town_pool >::GetNumItems(), GWP_TOWN, IncreaseGeneratingWorldProgress(), INVALID_STRING_ID, EconomySettings::larger_towns, Pool< Titem, Tindex, Tgrowth_step, Tmax_size, Tpool_type, Tcache, Tzero >::MAX_SIZE, min(), DifficultySettings::number_towns, ScaleByMapSize(), SetGeneratingWorldProgress(), ShowErrorMessage(), TSZ_RANDOM, and WL_CRITICAL.

Referenced by _GenerateWorld(), and FoundTownWindow::OnClick().

static RoadBits GenRandomRoadBits | ( |  | ) |
| static

Generate a random road block.

The probability of a straight road is somewhat higher than a curved.

Returns
  A RoadBits value with 2 bits set

Definition at line 1380 of file town_cmd.cpp.

References GB(), and ROAD_NW.

Referenced by GrowTown().

TileIndexDiff GetHouseNorthPart | ( | HouseID & | house | ) |

Determines if a given HouseID is part of a multitile house.

The given ID is set to the ID of the north tile and the TileDiff to the north tile is returned.

Parameters

  house | Is changed to the HouseID of the north tile of the same house

Returns
  TileDiff from the tile of the given HouseID to the north tile

Definition at line 2370 of file town_cmd.cpp.

References TileDiffXY().

Referenced by GetDistanceFromNearbyHouse(), RebuildTownCaches(), SearchNearbyHouseClass(), SearchNearbyHouseGRFID(), SearchNearbyHouseID(), UpdateHousesAndTowns(), and WatchedCargoCallback().

uint GetMaskOfTownActions | ( | int * | nump,
|  | CompanyID | cid,
|  | const Town * | t
| ) |  |

Get a list of available actions to do at a town.

Parameters

  nump | if not NULL add put the number of available actions in it
  cid | the company that is querying the town
  t | the town that is queried

Returns
  bitmasked value of enabled actions

Definition at line 2944 of file town_cmd.cpp.

References _settings_game, EconomySettings::bribe, COMPANY_SPECTATOR, GameSettings::economy, EconomySettings::exclusive_rights, EconomySettings::fund_buildings, EconomySettings::fund_roads, Pool< Titem, Tindex, Tgrowth_step, Tmax_size, Tpool_type, Tcache, Tzero >::PoolItem<&_company_pool >::Get(), HasBit(), lengthof, Town::ratings, Town::statues, TACT_BRIBE, TACT_BUILD_STATUE, TACT_BUY_RIGHTS, TACT_FUND_BUILDINGS, TACT_NONE, TACT_ROAD_REBUILD, and Town::unwanted.

Referenced by CmdDoTownAction(), TownAuthorityWindow::DrawWidget(), TownAuthorityWindow::OnClick(), and TownAuthorityWindow::OnPaint().

static int GetRating | ( | const Town * | t | ) |
| static

Get the rating of a town for the _current_company.

Parameters

  t | Town to get the rating from.

Returns
  Rating of the current company in the given town.

Definition at line 3255 of file town_cmd.cpp.

References _current_company, SmallVector< SmallPair< T, U >, S >::End(), SmallMap< T, U, S >::Find(), and Town::ratings.

Referenced by ChangeTownRating(), and CheckforTownRating().

HouseZonesBits GetTownRadiusGroup | ( | const Town * | t,
|  | TileIndex | tile
| ) |  |

Returns the bit corresponding to the town zone of the specified tile.

Parameters

  t | Town on which town zone is to be found
  tile | TileIndex where town zone needs to be found

Returns
  the bit position of the given zone, as defined in HouseZones

Definition at line 1947 of file town_cmd.cpp.

References DistanceSquare(), Town::fund_buildings_months, and Town::xy.

Referenced by BuildTownHouse(), RailTypeScopeResolver::GetVariable(), IndustryTileScopeResolver::GetVariable(), IndustriesScopeResolver::GetVariable(), AirportTileScopeResolver::GetVariable(), HouseScopeResolver::GetVariable(), and ObjectScopeResolver::GetVariable().

static RoadBits GetTownRoadBits | ( | TileIndex | tile | ) |
| static

Return the RoadBits of a tile.

Note
  There are many other functions doing things like that.
  Needs to be checked for needlessness.

Parameters

  tile | The tile we want to analyse

Returns
  The roadbits of the given tile

Definition at line 815 of file town_cmd.cpp.

References GetAnyRoadBits(), IsRoadDepotTile(), IsStandardRoadStopTile(), ROAD_NONE, and ROADTYPE_ROAD.

Referenced by GrowTown(), GrowTownAtRoad(), GrowTownWithBridge(), IsNeighborRoadTile(), and IsRoadAllowedHere().

static RoadBits GetTownRoadGridElement | ( | Town * | t,
|  | TileIndex | tile,
|  | DiagDirection | dir
| ) |  |
| static

Generate the RoadBits of a grid tile.

Parameters

  t | current town
  tile | tile in reference to the town
  dir | The direction to which we are growing ATM

Returns
  the RoadBit of the current tile regarding the selected town layout

Definition at line 943 of file town_cmd.cpp.

References DiagDirToRoadBits(), GetTileSlope(), Town::layout, ReverseDiagDir(), ROAD_ALL, ROAD_NE, ROAD_NONE, ROAD_NW, ROAD_SE, ROAD_SW, ROAD_X, ROAD_Y, SLOPE_E, SLOPE_N, SLOPE_NE, SLOPE_NW, SLOPE_S, SLOPE_SE, SLOPE_STEEP_E, SLOPE_STEEP_N, SLOPE_STEEP_S, SLOPE_STEEP_W, SLOPE_SW, SLOPE_W, TileIndexToTileIndexDiffC(), TL_2X2_GRID, TL_3X3_GRID, TileIndexDiffC::x, Town::xy, and TileIndexDiffC::y.

Referenced by GrowTownInTile().

uint32 GetWorldPopulation | ( |  | ) |

Determines the world population Basically, count population of all towns, one by one.

Returns
  uint32 the calculated population of the world

Definition at line 414 of file town_cmd.cpp.

References Town::cache, and TownCache::population.

Referenced by TownDirectoryWindow::SetStringParameters().

static bool GrowTown | ( | Town * | t | ) |
| static

Grow the town.

Parameters

  t | town to grow

Returns
  true iff a house was built

Definition at line 1394 of file town_cmd.cpp.

References _current_company, _generating_world, _settings_game, EconomySettings::allow_town_roads, CMD_BUILD_ROAD, CMD_LANDSCAPE_CLEAR, DC_EXEC, DC_NO_WATER, DoCommand(), GameSettings::economy, endof, GenRandomRoadBits(), GetTownRoadBits(), GrowTownAtRoad(), Pool< Titem, Tindex, Tgrowth_step, Tmax_size, Tpool_type, Tcache, Tzero >::PoolItem< Tpool >::index, IsTileFlat(), IsTileType(), MP_HOUSE, OWNER_TOWN, Backup< T >::Restore(), ROAD_NONE, CommandCost::Succeeded(), TILE_ADD, ToTileIndexDiff(), and Town::xy.

Referenced by CmdExpandTown(), and DoCreateTown().

static int GrowTownAtRoad | ( | Town * | t,
|  | TileIndex | tile
| ) |  |
| static

Returns "growth" if a house was built, or no if the build failed.

Parameters

  t | town to inquiry
  tile | to inquiry

Returns
  something other than zero(0)if town expansion was possible

Definition at line 1305 of file town_cmd.cpp.

References Town::cache, DIAGDIR_END, DiagDirToRoadBits(), GetTownRoadBits(), GetTunnelBridgeDirection(), GrowTownInTile(), HasTileRoadType(), Pool< Titem, Tindex, Tgrowth_step, Tmax_size, Tpool_type, Tcache, Tzero >::PoolItem< Tpool >::index, IsRoadDepot(), IsRoadOwner(), IsTileType(), IsValidDiagDirection(), Town::layout, MapSize(), MP_ROAD, MP_TUNNELBRIDGE, TownCache::num_houses, OWNER_NONE, OWNER_TOWN, RandomDiagDir(), ReverseDiagDir(), ROAD_NONE, ROADTYPE_ROAD, SetRoadOwner(), SetTownIndex(), TileAddByDiagDir(), TL_2X2_GRID, TL_3X3_GRID, and TL_BETTER_ROADS.

Referenced by GrowTown().

static void GrowTownInTile | ( | TileIndex * | tile_ptr,
|  | RoadBits | cur_rb,
|  | DiagDirection | target_dir,
|  | Town * | t1
| ) |  |
| static

Grows the given town.

There are at the moment 3 possible way's for the town expansion:

- Generate a random tile and check if there is a road allowed
- TL_ORIGINAL
- TL_BETTER_ROADS
- Check if the town geometry allows a road and which one
- TL_2X2_GRID
- TL_3X3_GRID
- Forbid roads, only build houses

Parameters

  tile_ptr | The current tile
  cur_rb | The current tiles RoadBits
  target_dir | The target road dir
  t1 | The current town

Definition at line 1136 of file town_cmd.cpp.

References _generating_world, _settings_game, EconomySettings::allow_town_level_crossings, EconomySettings::allow_town_roads, ConstructionSettings::build_on_slopes, BuildTownHouse(), Chance16(), ChangeDiagDir(), CleanUpRoadBits(), GameSettings::construction, DIAGDIR_END, DIAGDIRDIFF_90LEFT, DIAGDIRDIFF_90RIGHT, DiagDirToRoadBits(), GameSettings::economy, GetOtherTunnelBridgeEnd(), GetTownRoadGridElement(), GetTunnelBridgeTransportType(), GrowTownWithBridge(), GrowTownWithExtraHouse(), GrowTownWithRoad(), HasTileWaterGround(), IsRoadAllowedHere(), IsTileType(), IsValidTile(), Town::layout, MapSize(), MP_HOUSE, MP_RAILWAY, MP_TUNNELBRIDGE, RandomDiagDir(), ReverseDiagDir(), ROAD_NONE, TileAddByDiagDir(), TL_2X2_GRID, TL_3X3_GRID, TL_BETTER_ROADS, TL_ORIGINAL, and TRANSPORT_ROAD.

Referenced by GrowTownAtRoad().

static bool GrowTownWithBridge | ( | const Town * | t,
|  | const TileIndex | tile,
|  | const DiagDirection | bridge_dir
| ) |  |
| static

Grows the town with a bridge.

At first we check if a bridge is reasonable. If so we check if we are able to build it.

Parameters

  t | The current town
  tile | The current tile
  bridge_dir | The valid direction in which to grow a bridge

Returns
  true if a bridge has been build else false

Definition at line 1063 of file town_cmd.cpp.

References CMD_BUILD_BRIDGE, CommandFlagsToDCFlags(), DC_EXEC, DIAGDIR_END, DiagDirToRoadBits(), DoCommand(), GetCommandFlags(), GetTileSlope(), GetTownRoadBits(), InclinedSlope(), IsSea(), IsValidTile(), IsWaterTile(), MAX_BRIDGES, RandomRange(), ReverseDiagDir(), ROADTYPES_ROAD, SLOPE_FLAT, TileAddByDiagDir(), TileOffsByDiagDir(), and TRANSPORT_ROAD.

Referenced by GrowTownInTile().

static bool GrowTownWithExtraHouse | ( | Town * | t,
|  | TileIndex | tile
| ) |  |
| static

Grows the town with an extra house.

Check if there are enough neighbor house tiles next to the current tile. If there are enough add another house.

Parameters

  t | The current town
  tile | The target tile for the extra house

Returns
  true if an extra house has been added

Definition at line 1002 of file town_cmd.cpp.

References BuildTownHouse(), DIAGDIR_BEGIN, DIAGDIR_END, DistanceFromEdge(), GetTileType(), MP_HOUSE, MP_VOID, and TileAddByDiagDir().

Referenced by GrowTownInTile().

static bool GrowTownWithRoad | ( | const Town * | t,
|  | TileIndex | tile,
|  | RoadBits | rcmd
| ) |  |
| static

Grows the town with a road piece.

Parameters

  t | The current town
  tile | The current tile
  rcmd | The RoadBits we want to build on the tile

Returns
  true if the RoadBits have been added else false

Definition at line 1044 of file town_cmd.cpp.

References CMD_BUILD_ROAD, DC_EXEC, DC_NO_WATER, DoCommand(), Pool< Titem, Tindex, Tgrowth_step, Tmax_size, Tpool_type, Tcache, Tzero >::PoolItem< Tpool >::index, and CommandCost::Succeeded().

Referenced by GrowTownInTile().

static bool IsCloseToTown | ( | TileIndex | tile,
|  | uint | dist
| ) |  |
| static

Determines if a town is close to a tile.

Parameters

  tile | TileIndex of the tile to query
  dist | maximum distance to be accepted

Returns
  true if the tile correspond to the distance criteria

Definition at line 342 of file town_cmd.cpp.

References DistanceManhattan(), Pool< Titem, Tindex, Tgrowth_step, Tmax_size, Tpool_type, Tcache, Tzero >::PoolItem<&_town_pool >::GetNumItems(), GetTileType(), MapMaxX(), MapMaxY(), max(), min(), MP_HOUSE, TILE_AREA_LOOP, TileX(), TileXY(), TileY(), and Town::xy.

Referenced by TownCanBePlacedHere().

static bool IsNeighborRoadTile | ( | TileIndex | tile,
|  | const DiagDirection | dir,
|  | uint | dist_multi
| ) |  |
| static

Check for parallel road inside a given distance.

Assuming a road from (tile - TileOffsByDiagDir(dir)) to tile, is there a parallel road left or right of it within distance dist_multi?

Parameters

  tile | current tile
  dir | target direction
  dist_multi | distance multiplayer

Returns
  true if there is a parallel road

Definition at line 832 of file town_cmd.cpp.

References ChangeDiagDir(), DIAGDIRDIFF_90LEFT, DIAGDIRDIFF_90RIGHT, DiagDirToRoadBits(), GetTownRoadBits(), IsValidTile(), ReverseDiagDir(), TILE_ADD, and TileOffsByDiagDir().

Referenced by IsRoadAllowedHere().

static bool IsRoadAllowedHere | ( | Town * | t,
|  | TileIndex | tile,
|  | DiagDirection | dir
| ) |  |
| static

Check if a Road is allowed on a given tile.

Parameters

  t | The current town
  tile | The target tile
  dir | The direction in which we want to extend the town

Returns
  true if it is allowed else false

Definition at line 866 of file town_cmd.cpp.

References _generating_world, _settings_game, ConstructionSettings::build_on_slopes, Chance16(), CMD_BUILD_ROAD, CMD_ERROR, CMD_LANDSCAPE_CLEAR, CMD_TERRAFORM_LAND, ComplementSlope(), GameSettings::construction, DC_EXEC, DC_NO_WATER, DIAGDIR_NW, DIAGDIR_SE, DiagDirToAxis(), DistanceFromEdge(), DoCommand(), CommandCost::Failed(), GetBridgeAxis(), GetFoundationSlope(), GetTileSlope(), GetTownRoadBits(), IsBridgeAbove(), IsNeighborRoadTile(), Town::layout, ROAD_NONE, ROAD_X, ROAD_Y, SLOPE_ELEVATED, SLOPE_FLAT, SLOPE_NE, SLOPE_NW, and TL_ORIGINAL.

Referenced by GrowTownInTile().

static bool IsTileAlignedToGrid | ( | TileIndex | tile,
|  | TownLayout | layout
| ) |  |
| static

Towns must all be placed on the same grid or when they eventually interpenetrate their road networks will not mesh nicely; this function tells you if a tile is properly aligned.

Parameters

  tile | the tile to start at
  layout | which town layout algo is in effect

Returns
  true if the tile is in the correct location

Definition at line 1758 of file town_cmd.cpp.

References TileX(), TileY(), TL_2X2_GRID, and TL_3X3_GRID.

Referenced by FindFurthestFromWater().

static bool IsUniqueTownName | ( | const char * | name | ) |
| static

Verifies this custom name is unique.

Only custom names are checked.

Parameters

  name | name to check

Returns
  is this name unique?

Definition at line 1609 of file town_cmd.cpp.

References Town::name.

Referenced by CmdFoundTown(), and CmdRenameTown().

static void MakeSingleHouseBigger | ( | TileIndex | tile | ) |
| static

Helper function for house completion stages progression.

Parameters

  tile | TileIndex of the house (or parts of it) to "grow"

Definition at line 427 of file town_cmd.cpp.

References ChangePopulation(), GetHouseConstructionTick(), GetHouseType(), IncHouseConstructionTick(), IsHouseCompleted(), IsTileType(), MarkTileDirtyByTile(), MP_HOUSE, and ResetHouseAge().

Referenced by MakeTownHouseBigger().

static void MakeTownHouse | ( | TileIndex | t,
|  | Town * | town,
|  | byte | counter,
|  | byte | stage,
|  | HouseID | type,
|  | byte | random_bits
| ) |  |
| static

Write house information into the map.

For houses > 1 tile, all tiles are marked.

Parameters

  t | tile index
  town | The town related to this house
  counter | of construction step
  stage | of construction (used for drawing)
  type | of house. Index into house specs array
  random_bits | required for newgrf houses

Precondition
  house can be built here

Definition at line 1995 of file town_cmd.cpp.

References HouseSpec::building_flags, ClearMakeHouseTile(), and TileDiffXY().

Referenced by BuildTownHouse().

static void MakeTownHouseBigger | ( | TileIndex | tile | ) |
| static

Make the house advance in its construction stages until completion.

Parameters

  tile | TileIndex of house

Definition at line 450 of file town_cmd.cpp.

References HouseSpec::building_flags, GetHouseType(), MakeSingleHouseBigger(), and TILE_ADDXY.

Referenced by TileLoop_Town().

static DiagDirection RandomDiagDir | ( |  | ) |
| inline static

Return a random direction.

Returns
  a random direction

Definition at line 202 of file town_cmd.cpp.

Referenced by GrowTownAtRoad(), and GrowTownInTile().

static bool SearchTileForStatue | ( | TileIndex | tile,
|  | void * | user_data
| ) |  |
| static

Search callback function for TownActionBuildStatue.

Parameters

  tile | Tile on which to perform the search.
  user_data | Reference to the statue search data.

Returns
  Result of the test.

Definition at line 2783 of file town_cmd.cpp.

References StatueBuildSearchData::best_position, GetTileSlope(), INVALID_TILE, IsBridgeAbove(), IsSteepSlope(), IsTileType(), MP_CLEAR, MP_HOUSE, MP_TREES, StatueBuildSearchData::tile_count, and TryClearTile().

Referenced by TownActionBuildStatue().

void SetTownRatingTestMode | ( | bool | mode | ) |

Switch the town rating to test-mode, to allow commands to be tested without affecting current ratings.

The function is safe to use in nested calls.

Parameters

  mode | Test mode switch (`true` means go to test-mode, `false` means leave test-mode).

Definition at line 3235 of file town_cmd.cpp.

References SmallVector< SmallPair< T, U >, S >::Clear().

Referenced by DoCommand(), and DoCommandPInternal().

static void TileLoop_Town | ( | TileIndex | tile | ) |
| static

Tile callback function.

Periodic tic handler for houses and town

Parameters

  tile | been asked to do its stuff

Definition at line 465 of file town_cmd.cpp.

References _current_company, AddAnimatedTile(), HouseSpec::building_flags, BuildTownHouse(), CALLBACK_FAILED, CALLBACK_HOUSEPRODCARGO_END, HouseSpec::callback_mask, CBID_HOUSE_PRODUCE_CARGO, CBM_HOUSE_PRODUCE_CARGO, Chance16(), CT_INVALID, EconomyIsInRecession(), Town::flags, GB(), CargoSpec::Get(), GetCargoTranslation(), GetHouseAge(), GetHouseType(), StationFinder::GetStations(), HouseSpec::grf_prop, GRFFilePropsBase< Tcnt >::grffile, HasBit(), Pool< Titem, Tindex, Tgrowth_step, Tmax_size, Tpool_type, Tcache, Tzero >::PoolItem< Tpool >::index, IsHouseCompleted(), LiftHasDestination(), HouseSpec::mail_generation, MakeTownHouseBigger(), HouseSpec::minimum_life, TransportedCargoStat< Tstorage >::new_act, NEW_HOUSE_OFFSET, TransportedCargoStat< Tstorage >::new_max, OWNER_TOWN, HouseSpec::population, Backup< T >::Restore(), ST_TOWN, Town::supplied, Town::time_until_rebuild, and TOWN_IS_GROWING.

static CommandCost TownActionBuildStatue | ( | Town * | t,
|  | DoCommandFlag | flags
| ) |  |
| static

Perform a 9x9 tiles circular search from the center of the town in order to find a free tile to place a statue.

Parameters

  t | town to search in
  flags | Used to check if the statue must be built or not.

Returns
  Empty cost or an error.

Definition at line 2826 of file town_cmd.cpp.

References _current_company, StatueBuildSearchData::best_position, BuildObject(), Pool< Titem, Tindex, Tgrowth_step, Tmax_size, Tpool_type, Tcache, Tzero >::PoolItem<&_object_pool >::CanAllocateItem(), CircularTileSearch(), CMD_LANDSCAPE_CLEAR, DoCommand(), INVALID_TILE, MarkTileDirtyByTile(), OBJECT_STATUE, OWNER_NONE, Backup< T >::Restore(), return_cmd_error, SearchTileForStatue(), SetBit(), Town::statues, and Town::xy.

static CommandCost TownCanBePlacedHere | ( | TileIndex | tile | ) |
| static

Checks if it's possible to place a town at given tile.

Parameters

  tile | tile to check

Returns
  error value or zero cost

Definition at line 1584 of file town_cmd.cpp.

References DistanceFromEdge(), EXPENSES_OTHER, IsCloseToTown(), IsTileFlat(), IsTileType(), MP_CLEAR, MP_TREES, and return_cmd_error.

Referenced by CmdFoundTown().

static bool TownLayoutAllows2x2HouseHere | ( | Town * | t,
|  | TileIndex | tile
| ) |  |
| inline static

Checks if current town layout allows 2x2 building here.

Parameters

  t | town
  tile | tile to check

Returns
  true iff town layout allows 2x2 building here

Note
  see layouts

Definition at line 2112 of file town_cmd.cpp.

References _generating_world, _settings_game, EconomySettings::allow_town_roads, GameSettings::economy, Town::layout, TileIndexToTileIndexDiffC(), TL_2X2_GRID, TL_3X3_GRID, TileIndexDiffC::x, Town::xy, and TileIndexDiffC::y.

Referenced by CheckTownBuild2x2House().

static bool TownLayoutAllowsHouseHere | ( | Town * | t,
|  | TileIndex | tile
| ) |  |
| inline static

Checks if current town layout allows building here.

Parameters

  t | town
  tile | tile to check

Returns
  true iff town layout allows building here

Note
  see layouts

Definition at line 2081 of file town_cmd.cpp.

References _generating_world, _settings_game, EconomySettings::allow_town_roads, GameSettings::economy, Town::layout, TileIndexToTileIndexDiffC(), TL_2X2_GRID, TL_3X3_GRID, TileIndexDiffC::x, Town::xy, and TileIndexDiffC::y.

Referenced by BuildTownHouse(), and CheckTownBuild2House().

static bool TryClearTile | ( | TileIndex | tile | ) |
| static

Check whether the land can be cleared.

Parameters

  tile | Tile to check.

Returns
  The tile can be cleared.

Definition at line 2761 of file town_cmd.cpp.

References _current_company, CMD_LANDSCAPE_CLEAR, DC_NONE, DoCommand(), OWNER_NONE, Backup< T >::Restore(), and CommandCost::Succeeded().

Referenced by SearchTileForStatue().

void UpdateAllTownVirtCoords | ( |  | ) |

Update the virtual coords needed to draw the town sign for all towns.

Definition at line 386 of file town_cmd.cpp.

References Town::UpdateVirtCoord().

Referenced by UpdateAllVirtCoords().

void UpdateTownCargoBitmap | ( |  | ) |

Updates the bitmap of all cargoes accepted by houses.

Definition at line 767 of file town_cmd.cpp.

References _town_cargoes_accepted, and Town::cargo_accepted_total.

Referenced by RebuildTownCaches().

static void UpdateTownCargoes | ( | Town * | t,
|  | TileIndex | start,
|  | bool | update_total = `true`
| ) |  |
| static

Update accepted town cargoes around a specific tile.

Parameters

  t | The town to update.
  start | Update the values around this tile.
  update_total | Set to true if the total cargo acceptance should be updated.

Definition at line 718 of file town_cmd.cpp.

References Town::cargo_accepted, Town::cargo_produced, TileMatrix< uint32, 4 >::GetAreaForTile(), GetTownIndex(), Pool< Titem, Tindex, Tgrowth_step, Tmax_size, Tpool_type, Tcache, Tzero >::PoolItem< Tpool >::index, IsTileType(), MP_HOUSE, NUM_CARGO, SetBit(), TILE_AREA_LOOP, and UpdateTownCargoTotal().

void UpdateTownCargoes | ( | Town * | t | ) |

Update cargo acceptance for the complete town.

Parameters

  t | The town to update.

Definition at line 748 of file town_cmd.cpp.

References Town::cargo_accepted, Town::cargo_produced, TileMatrix< T, N >::GetArea(), INVALID_TILE, OrthogonalTileArea::tile, TILE_AREA_LOOP, TileX(), TileY(), UpdateTownCargoes(), and UpdateTownCargoTotal().

Referenced by AfterLoadGame(), BuildTownHouse(), RebuildTownCaches(), and UpdateTownCargoes().

void UpdateTownCargoTotal | ( | Town * | t | ) |

Update the total cargo acceptance of the whole town.

Parameters

  t | The town to update.

Definition at line 700 of file town_cmd.cpp.

References Town::cargo_accepted, Town::cargo_accepted_total, TileMatrix< T, N >::GetArea(), TILE_AREA_LOOP, TileX(), and TileY().

Referenced by UpdateTownCargoes().

static void UpdateTownGrowRate | ( | Town * | t | ) |
| static

Towns are processed every TOWN_GROWTH_TICKS ticks, and this is the number of times towns are processed before a new building is built.

Definition at line 3051 of file town_cmd.cpp.

References _settings_game, Town::cache, Chance16(), ClrBit(), DistanceSquare(), GameSettings::economy, Town::flags, Town::fund_buildings_months, GetSnowLine(), GetTropicZone(), Town::goal, Town::grow_counter, Town::growth_rate, Pool< Titem, Tindex, Tgrowth_step, Tmax_size, Tpool_type, Tcache, Tzero >::PoolItem< Tpool >::index, Town::larger_town, min(), TownCache::num_houses, TransportedCargoStat< Tstorage >::old_act, TownCache::population, Town::received, SetBit(), SetWindowDirty(), TownCache::squared_town_zone_radius, TE_END, TileHeight(), TOWN_GROW_RATE_CUSTOM, TOWN_GROW_RATE_CUSTOM_NONE, TOWN_GROWTH_DESERT, EconomySettings::town_growth_rate, TOWN_GROWTH_WINTER, TOWN_IS_GROWING, TROPICZONE_DESERT, WC_TOWN_VIEW, BaseStation::xy, and Town::xy.

Referenced by CmdTownCargoGoal(), and CmdTownGrowthRate().

## Variable Documentation

const TileTypeProcs _tile_type_town_procs

Initial value:
{
DrawTile_Town,
GetSlopePixelZ_Town,
ClearTile_Town,
AddAcceptedCargo_Town,
GetTileDesc_Town,
GetTileTrackStatus_Town,
NULL,
AnimateTile_Town,
TileLoop_Town,
ChangeTileOwner_Town,
AddProducedCargo_Town,
NULL,
GetFoundation_Town,
TerraformTile_Town,
}

Tile callback functions for a town.

const byte _town_action_costs[TACT_COUNT]

Initial value:
{
2, 4, 9, 35, 48, 53, 117, 175
}

Factor in the cost of each town action.

See Also
  TownActions

Definition at line 2705 of file town_cmd.cpp.

Referenced by TownAuthorityWindow::DrawWidget(), and TownAuthorityWindow::UpdateWidgetSize().

TownActionProc* const _town_action_proc[]
| static

Initial value:
{
TownActionAdvertiseSmall,
TownActionAdvertiseMedium,
TownActionAdvertiseLarge,
TownActionRoadRebuild,
TownActionBuildStatue,
TownActionFundBuildings,
TownActionBuyRights,
TownActionBribe
}

Definition at line 2926 of file town_cmd.cpp.

TownDrawTileProc* const _town_draw_tile_procs[1]
| static

Initial value:
{
TownDrawHouseLift
}

Definition at line 193 of file town_cmd.cpp.