Handling of town tiles. More...

#include "stdafx.h"
#include "road.h"
#include "road_internal.h"
#include "road_cmd.h"
#include "landscape.h"
#include "viewport_func.h"
#include "viewport_kdtree.h"
#include "command_func.h"
#include "company_func.h"
#include "industry.h"
#include "station_base.h"
#include "waypoint_base.h"
#include "station_kdtree.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 "subsidy_func.h"
#include "core/pool_func.hpp"
#include "town.h"
#include "town_kdtree.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 "town_cmd.h"
#include "landscape_cmd.h"
#include "terraform_cmd.h"
#include "tunnelbridge_cmd.h"
#include "timer/timer.h"
#include "timer/timer_game_calendar.h"
#include "timer/timer_game_economy.h"
#include "timer/timer_game_tick.h"
#include "table/strings.h"
#include "table/town_land.h"
#include "safeguards.h"

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
void	RebuildTownKdtree ()

static bool	TestTownOwnsBridge (TileIndex tile, const Town *t)
	Check if a town 'owns' a bridge. More...

static bool	TryBuildTownHouse (Town *t, TileIndex tile)
	Tries to build a house at this tile. More...

static Town *	CreateRandomTown (uint attempts, uint32_t townnameparts, TownSize size, bool city, TownLayout layout)
	Create a random town somewhere in the world. More...

static void	TownDrawHouseLift (const TileInfo *ti)

static DiagDirection	RandomDiagDir ()
	Return a random direction. More...

static void	DrawTile_Town (TileInfo *ti)
	Draw a house and its tile. More...

static int	GetSlopePixelZ_Town (TileIndex tile, uint, uint, bool)

static Foundation	GetFoundation_Town (TileIndex tile, Slope tileh)
	Get the foundation for a house. More...

static void	AnimateTile_Town (TileIndex tile)
	Animate a tile for a town. More...

static bool	IsCloseToTown (TileIndex tile, uint dist)
	Determines if a town is close to a tile. More...

void	UpdateAllTownVirtCoords ()
	Update the virtual coords needed to draw the town sign for all towns.

void	ClearAllTownCachedNames ()
	Clear the cached_name of all towns.

static void	ChangePopulation (Town *t, int mod)
	Change the town's population as recorded in the town cache, town label, and town directory. More...

uint32_t	GetWorldPopulation ()
	Get the total population, the sum of all towns in the world. More...

static void	RemoveNearbyStations (Town *t, TileIndex tile, BuildingFlags flags)
	Remove stations from nearby station list if a town is no longer in the catchment area of each. More...

static void	AdvanceSingleHouseConstruction (TileIndex tile)
	Helper function for house construction stage progression. More...

static void	AdvanceHouseConstruction (TileIndex tile)
	Increase the construction stage of a house. More...

static void	TownGenerateCargo (Town *t, CargoID ct, uint amount, StationFinder &stations, bool affected_by_recession)
	Generate cargo for a house, scaled by the current economy scale. More...

static void	TownGenerateCargoOriginal (Town *t, TownProductionEffect tpe, uint8_t rate, StationFinder &stations)
	Generate cargo for a house using the original algorithm. More...

static void	TownGenerateCargoBinominal (Town *t, TownProductionEffect tpe, uint8_t rate, StationFinder &stations)
	Generate cargo for a house using the binominal algorithm. More...

static void	TileLoop_Town (TileIndex tile)
	Tile callback function. More...

static CommandCost	ClearTile_Town (TileIndex tile, DoCommandFlag flags)
	Callback function to clear a house tile. More...

static void	AddProducedCargo_Town (TileIndex tile, CargoArray &produced)

static void	AddAcceptedCargoSetMask (CargoID cargo, uint amount, CargoArray &acceptance, CargoTypes &always_accepted)
	Fill cargo acceptance array and always_accepted mask, if cargo ID is valid. More...

static void	AddAcceptedCargo_Town (TileIndex tile, CargoArray &acceptance, CargoTypes &always_accepted)

static void	GetTileDesc_Town (TileIndex tile, TileDesc *td)

static TrackStatus	GetTileTrackStatus_Town (TileIndex, TransportType, uint, DiagDirection)

static void	ChangeTileOwner_Town (TileIndex, Owner, Owner)

static bool	GrowTown (Town *t)
	Grow the town. More...

static void	TownTickHandler (Town *t)
	Handle the town tick for a single town, by growing the town if desired. More...

void	OnTick_Town ()
	Iterate through all towns and call their tick handler.

static RoadBits	GetTownRoadBits (TileIndex tile)
	Return the RoadBits of a tile, ignoring depot and bay road stops. More...

RoadType	GetTownRoadType ()
	Get the road type that towns should build at this current moment. More...

static TimerGameCalendar::Date	GetTownRoadTypeFirstIntroductionDate ()
	Get the calendar date of the earliest town-buildable road type. More...

bool	CheckTownRoadTypes ()
	Check if towns are able to build road. More...

static bool	IsNeighborRoadTile (TileIndex tile, const DiagDirection dir, uint dist_multi)
	Check for parallel road inside a given distance. More...

static bool	IsRoadAllowedHere (Town *t, TileIndex tile, DiagDirection dir)
	Check if a Road is allowed on a given tile. More...

static bool	TerraformTownTile (TileIndex tile, Slope edges, bool dir)

static void	LevelTownLand (TileIndex tile)

static RoadBits	GetTownRoadGridElement (Town *t, TileIndex tile, DiagDirection dir)
	Generate the RoadBits of a grid tile. More...

static bool	GrowTownWithExtraHouse (Town *t, TileIndex tile)
	Grows the town with an extra house. More...

static bool	GrowTownWithRoad (const Town *t, TileIndex tile, RoadBits rcmd)
	Grows the town with a road piece. More...

static bool	CanRoadContinueIntoNextTile (const Town *t, const TileIndex tile, const DiagDirection road_dir)
	Checks if a town road can be continued into the next tile. More...

static bool	RedundantBridgeExistsNearby (TileIndex tile, void *user_data)
	CircularTileSearch proc which checks for a nearby parallel bridge to avoid building redundant bridges. More...

static bool	GrowTownWithBridge (const Town *t, const TileIndex tile, const DiagDirection bridge_dir)
	Grows the town with a bridge. More...

static bool	GrowTownWithTunnel (const Town *t, const TileIndex tile, const DiagDirection tunnel_dir)
	Grows the town with a tunnel. More...

static bool	RoadTypesAllowHouseHere (TileIndex t)
	Checks whether at least one surrounding road allows to build a house here. More...

static bool	TownCanGrowRoad (TileIndex tile)
	Test if town can grow road onto a specific tile. More...

static bool	TownAllowedToBuildRoads ()
	Check if the town is allowed to build roads. More...

static void	GrowTownInTile (TileIndex tile_ptr, RoadBits cur_rb, DiagDirection target_dir, Town t1)
	Grows the given town. More...

static bool	CanFollowRoad (TileIndex tile, DiagDirection dir)
	Checks whether a road can be followed or is a dead end, that can not be extended to the next tile. More...

static bool	GrowTownAtRoad (Town *t, TileIndex tile)
	Try to grow a town at a given road tile. More...

static RoadBits	GenRandomRoadBits ()
	Generate a random road block. More...

void	UpdateTownRadius (Town *t)
	Update the cached town zone radii of a town, based on the number of houses. More...

void	UpdateTownMaxPass (Town *t)
	Update the maximum amount of montly passengers and mail for a town, based on its population. More...

static void	UpdateTownGrowthRate (Town *t)
	Updates town growth rate. More...

static void	UpdateTownGrowth (Town *t)
	Updates town growth state (whether it is growing or not). More...

static void	DoCreateTown (Town *t, TileIndex tile, uint32_t townnameparts, TownSize size, bool city, TownLayout layout, bool manual)
	Actually create a town. More...

static CommandCost	TownCanBePlacedHere (TileIndex tile)
	Check if it's possible to place a town on a given tile. More...

static bool	IsUniqueTownName (const std::string &name)
	Verifies this custom name is unique. More...

std::tuple< CommandCost, Money, TownID >	CmdFoundTown (DoCommandFlag flags, TileIndex tile, TownSize size, bool city, TownLayout layout, bool random_location, uint32_t townnameparts, const std::string &text)
	Create a new town. More...

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. More...

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. More...

static bool	FindFurthestFromWater (TileIndex tile, void *user_data)
	CircularTileSearch callback; finds the tile furthest from any water. More...

static bool	FindNearestEmptyLand (TileIndex tile, void *)
	CircularTileSearch callback to find the nearest land tile. More...

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. More...

bool	GenerateTowns (TownLayout layout)
	Generate a number of towns with a given layout. More...

HouseZonesBits	GetTownRadiusGroup (const Town *t, TileIndex tile)
	Returns the bit corresponding to the town zone of the specified tile. More...

static void	ClearMakeHouseTile (TileIndex tile, Town *t, uint8_t counter, uint8_t stage, HouseID type, uint8_t random_bits)
	Clears tile and builds a house or house part. More...

static void	MakeTownHouse (TileIndex tile, Town *t, uint8_t counter, uint8_t stage, HouseID type, uint8_t random_bits)
	Write house information into the map. More...

static bool	CanBuildHouseHere (TileIndex tile, bool noslope)
	Check if a house can be built here, based on slope, whether there's a bridge above, and if we can clear the land. More...

static bool	CheckBuildHouseSameZ (TileIndex tile, int z, bool noslope)
	Check if a tile where we want to build a multi-tile house has an appropriate max Z. More...

static bool	CheckFree2x2Area (TileIndex tile, int z, bool noslope)
	Checks if a house of size 2x2 can be built at this tile. More...

static bool	TownLayoutAllowsHouseHere (Town *t, TileIndex tile)
	Checks if the current town layout allows building here. More...

static bool	TownLayoutAllows2x2HouseHere (Town *t, TileIndex tile)
	Checks if the current town layout allows a 2x2 building here. More...

static bool	CheckTownBuild2House (TileIndex tile, Town t, int maxz, bool noslope, DiagDirection second)
	Checks if a 1x2 or 2x1 building is allowed here, accounting for road layout and tile heights. More...

static bool	CheckTownBuild2x2House (TileIndex tile, Town t, int maxz, bool noslope)
	Checks if a 1x2 or 2x1 building is allowed here, accounting for road layout and tile heights. More...

static void	BuildTownHouse (Town t, TileIndex tile, const HouseSpec hs, HouseID house, uint8_t random_bits)
	Build a house at this tile. More...

CommandCost	CmdPlaceHouse (DoCommandFlag flags, TileIndex tile, HouseID house)

static void	DoClearTownHouseHelper (TileIndex tile, Town *t, HouseID house)
	Update data structures when a house is removed. More...

TileIndexDiff	GetHouseNorthPart (HouseID &house)
	Determines if a given HouseID is part of a multitile house. More...

void	ClearTownHouse (Town *t, TileIndex tile)
	Clear a town house. More...

CommandCost	CmdRenameTown (DoCommandFlag flags, TownID town_id, const std::string &text)
	Rename a town (server-only). More...

const CargoSpec *	FindFirstCargoWithTownAcceptanceEffect (TownAcceptanceEffect effect)
	Determines the first cargo with a certain town effect. More...

CommandCost	CmdTownCargoGoal (DoCommandFlag flags, TownID town_id, TownAcceptanceEffect tae, uint32_t goal)
	Change the cargo goal of a town. More...

CommandCost	CmdTownSetText (DoCommandFlag flags, TownID town_id, const std::string &text)
	Set a custom text in the Town window. More...

CommandCost	CmdTownGrowthRate (DoCommandFlag flags, TownID town_id, uint16_t growth_rate)
	Change the growth rate of the town. More...

CommandCost	CmdTownRating (DoCommandFlag flags, TownID town_id, CompanyID company_id, int16_t rating)
	Change the rating of a company in a town. More...

CommandCost	CmdExpandTown (DoCommandFlag flags, TownID town_id, uint32_t grow_amount)
	Expand a town (scenario editor only). More...

CommandCost	CmdDeleteTown (DoCommandFlag flags, TownID town_id)
	Delete a town (scenario editor or worldgen only). More...

static CommandCost	TownActionAdvertiseSmall (Town *t, DoCommandFlag flags)
	Perform the "small advertising campaign" town action. More...

static CommandCost	TownActionAdvertiseMedium (Town *t, DoCommandFlag flags)
	Perform the "medium advertising campaign" town action. More...

static CommandCost	TownActionAdvertiseLarge (Town *t, DoCommandFlag flags)
	Perform the "large advertising campaign" town action. More...

static CommandCost	TownActionRoadRebuild (Town *t, DoCommandFlag flags)
	Perform the "local road reconstruction" town action. More...

static bool	CheckClearTile (TileIndex tile)
	Check whether the land can be cleared. More...

static bool	SearchTileForStatue (TileIndex tile, void *user_data)
	Search callback function for TownActionBuildStatue. More...

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. More...

static CommandCost	TownActionFundBuildings (Town *t, DoCommandFlag flags)
	Perform the "fund new buildings" town action. More...

static CommandCost	TownActionBuyRights (Town *t, DoCommandFlag flags)
	Perform the "buy exclusive transport rights" town action. More...

static CommandCost	TownActionBribe (Town *t, DoCommandFlag flags)
	Perform the "bribe" town action. More...

TownActions	GetMaskOfTownActions (CompanyID cid, const Town *t)
	Get a list of available town authority actions. More...

CommandCost	CmdDoTownAction (DoCommandFlag flags, TownID town_id, uint8_t action)
	Do a town action. More...

template<typename Func >
static void	ForAllStationsNearTown (Town *t, Func func)

static void	UpdateTownRating (Town *t)
	Monthly callback to update town and station ratings. More...

static void	UpdateTownGrowCounter (Town *t, uint16_t prev_growth_rate)
	Updates town grow counter after growth rate change. More...

static int	CountActiveStations (Town *t)
	Calculates amount of active stations in the range of town (HZB_TOWN_EDGE). More...

static uint	GetNormalGrowthRate (Town *t)
	Calculates town growth rate in normal conditions (custom growth rate not set). More...

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. More...

Town *	CalcClosestTownFromTile (TileIndex tile, uint threshold)
	Return the town closest to the given tile within threshold. More...

Town *	ClosestTownFromTile (TileIndex tile, uint threshold)
	Return the town closest (in distance or ownership) to a given tile, within a given threshold. More...

void	SetTownRatingTestMode (bool mode)
	Switch the town rating to test-mode, to allow commands to be tested without affecting current ratings. More...

static int	GetRating (const Town *t)
	Get the rating of a town for the _current_company. More...

void	ChangeTownRating (Town *t, int add, int max, DoCommandFlag flags)
	Changes town rating of the current company. More...

CommandCost	CheckforTownRating (DoCommandFlag flags, Town *t, TownRatingCheckType type)
	Does the town authority allow the (destructive) action of the current company? More...

static CommandCost	TerraformTile_Town (TileIndex tile, DoCommandFlag flags, int z_new, Slope tileh_new)

std::span< const DrawBuildingsTileStruct >	GetTownDrawTileData ()

Variables
TownPool	_town_pool ("Town")

TownKdtree	_town_kdtree {}

static bool	_generating_town = false
	Set if a town is being generated.

static int	_grow_town_result

static TownDrawTileProc *const	_town_draw_tile_procs [1]

static const uint8_t	_num_initial_towns [4] = {5, 11, 23, 46}

const uint8_t	_town_action_costs [TACT_COUNT]
	Factor in the cost of each town action. More...

static TownActionProc *const	_town_action_proc []

static bool	_town_rating_test = false
	If `true`, town rating is in test-mode.

static std::map< const Town *, int >	_town_test_ratings
	Map of towns to modified ratings, while in town rating test-mode.

static IntervalTimer< TimerGameEconomy >	_economy_towns_monthly ({TimerGameEconomy::MONTH, TimerGameEconomy::Priority::TOWN}, [](auto) { for(Town t :Town::Iterate()) { if(t->road_build_months !=0) t->road_build_months--;if(t->fund_buildings_months !=0) t->fund_buildings_months--;if(t->exclusive_counter !=0) { if(--t->exclusive_counter==0) t->exclusivity=INVALID_COMPANY;} for(const Company c :Company::Iterate()) { if(t->unwanted[c->index] > 0) t->unwanted[c->index]--;} for(auto &supplied :t->supplied) supplied.NewMonth();for(auto &received :t->received) received.NewMonth();UpdateTownGrowth(t);UpdateTownRating(t);SetWindowDirty(WC_TOWN_VIEW, t->index);} })

static IntervalTimer< TimerGameEconomy >	_economy_towns_yearly ({TimerGameEconomy::YEAR, TimerGameEconomy::Priority::TOWN}, [](auto) { for(TileIndex t=0;t< Map::Size();t++) { if(!IsTileType(t, MP_HOUSE)) continue;IncrementHouseAge(t);} })

const TileTypeProcs	_tile_type_town_procs
	Tile callback functions for a town. More...

Detailed Description

Handling of town tiles.

Definition in file town_cmd.cpp.

Function Documentation

◆ AddAcceptedCargoSetMask()

static void AddAcceptedCargoSetMask	(	CargoID	cargo,
		uint	amount,
		CargoArray &	acceptance,
		CargoTypes &	always_accepted
	)

static

Fill cargo acceptance array and always_accepted mask, if cargo ID is valid.

Parameters

	cargo	Cargo type to add.
	amount	Amount of cargo to add.
[out]	acceptance	Output array containing amount of cargo accepted.
[out]	always_accepted	Output mask of accepted cargo types.

Definition at line 784 of file town_cmd.cpp.

References IsValidCargoID(), and SetBit().

◆ AdvanceHouseConstruction()

static void AdvanceHouseConstruction ( TileIndex tile )

static

Increase the construction stage of a house.

Parameters

tile	The tile of the house under construction.

Definition at line 521 of file town_cmd.cpp.

References HouseSpec::building_flags, HouseSpec::Get(), and GetHouseType().

◆ AdvanceSingleHouseConstruction()

static void AdvanceSingleHouseConstruction ( TileIndex tile )

static

Helper function for house construction stage progression.

Parameters

tile	TileIndex of the house (or parts of it) to construct.

Definition at line 498 of file town_cmd.cpp.

References GetHouseConstructionTick(), IncHouseConstructionTick(), IsTileType(), and MP_HOUSE.

◆ AlignTileToGrid()

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	The town layout in effect.

Returns: The adjusted tile.

Definition at line 2222 of file town_cmd.cpp.

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

◆ AnimateTile_Town()

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 350 of file town_cmd.cpp.

References GetHouseType(), and NEW_HOUSE_OFFSET.

◆ BuildTownHouse()

static void BuildTownHouse	(	Town *	t,
		TileIndex	tile,
		const HouseSpec *	hs,
		HouseID	house,
		uint8_t	random_bits
	)

static

Build a house at this tile.

Parameters

t	The town the house will belong to.
tile	The tile to try building on.
hs	The HouseSpec of the house.
house	The HouseID of the house.
random_bits	The random data to be associated with the house.

Definition at line 2698 of file town_cmd.cpp.

References _generating_world, Town::cache, and TownCache::num_houses.

◆ CalcClosestTownFromTile()

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 nullptr if there is no such town.

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

Definition at line 3852 of file town_cmd.cpp.

References Pool< Titem, Tindex, Tgrowth_step, Tmax_size, Tpool_type, Tcache, Tzero >::PoolItem<&_town_pool >::GetNumItems().

Referenced by AirportGetNearestTown(), BuildObject(), ClosestTownFromTile(), CmdBuildBridge(), CmdBuildRoad(), and CmdBuildTunnel().

◆ CanBuildHouseHere()

static bool CanBuildHouseHere	(	TileIndex	tile,
		bool	noslope
	)

inlinestatic

Check if a house can be built here, based on slope, whether there's a bridge above, and if we can clear the land.

Parameters

tile	The tile to check.
noslope	Are foundations prohibited for this house?

Returns: true iff house can be built here.

Definition at line 2516 of file town_cmd.cpp.

References DC_AUTO, DC_NO_WATER, GetTileSlope(), IsBridgeAbove(), IsSteepSlope(), RoadTypesAllowHouseHere(), and SLOPE_FLAT.

Referenced by CheckBuildHouseSameZ(), and TryBuildTownHouse().

◆ CanFollowRoad()

static bool CanFollowRoad	(	TileIndex	tile,
		DiagDirection	dir
	)

static

Checks whether a road can be followed or is a dead end, that can not be extended to the next tile.

This only checks trivial but often cases.

Parameters

tile	Start tile for road.
dir	Direction for road to follow or build.

Returns: true If road is or can be connected in the specified direction.

Definition at line 1722 of file town_cmd.cpp.

References DiagDirToRoadBits(), GetTileType(), GetTownRoadBits(), GetTunnelBridgeTransportType(), HasTileWaterGround(), IsDriveThroughStopTile(), IsValidTile(), MP_HOUSE, MP_INDUSTRY, MP_OBJECT, MP_ROAD, MP_STATION, MP_TUNNELBRIDGE, ReverseDiagDir(), ROAD_NONE, TileOffsByDiagDir(), TownAllowedToBuildRoads(), and TRANSPORT_ROAD.

◆ CanRoadContinueIntoNextTile()

static bool CanRoadContinueIntoNextTile	(	const Town *	t,
		const TileIndex	tile,
		const DiagDirection	road_dir
	)

static

Checks if a town road can be continued into the next tile.

Road vehicle stations, bridges, and tunnels are fine, as long as they are facing the right direction.

Parameters

t	The current town
tile	The tile where the road would be built
road_dir	The direction of the road

Returns: true if the road can be continued, else false

Definition at line 1237 of file town_cmd.cpp.

References _settings_game, EconomySettings::allow_town_level_crossings, DC_AUTO, DC_NO_WATER, DiagDirToAxis(), DiagDirToRoadBits(), DRD_NONE, GameSettings::economy, GetBayRoadStopDir(), GetDriveThroughStopAxis(), GetRoadDepotDirection(), GetTownRoadType(), GetTunnelBridgeDirection(), GetTunnelBridgeTransportType(), Pool< Titem, Tindex, Tgrowth_step, Tmax_size, Tpool_type, Tcache, Tzero >::PoolItem< Tpool >::index, IsBayRoadStopTile(), IsDriveThroughStopTile(), IsRoadDepot(), IsTileType(), IsValidTile(), MP_RAILWAY, MP_ROAD, MP_STATION, MP_TUNNELBRIDGE, ReverseDiagDir(), TileOffsByDiagDir(), and TRANSPORT_ROAD.

Referenced by GrowTownWithBridge(), and GrowTownWithTunnel().

◆ ChangePopulation()

static void ChangePopulation	(	Town *	t,
		int	mod
	)

static

Change the town's population as recorded in the town cache, town label, and town directory.

Parameters

t	The town which has changed.
mod	The population change (can be positive or negative).

Definition at line 447 of file town_cmd.cpp.

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

Referenced by ClearTownHouse().

◆ ChangeTownRating()

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 3949 of file town_cmd.cpp.

References _cheats, _current_company, _town_rating_test, _town_test_ratings, 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, Town::ratings, SetBit(), SetWindowDirty(), Cheat::value, and WC_TOWN_AUTHORITY.

◆ CheckBuildHouseSameZ()

static bool CheckBuildHouseSameZ	(	TileIndex	tile,
		int	z,
		bool	noslope
	)

inlinestatic

Check if a tile where we want to build a multi-tile house has an appropriate max Z.

Parameters

tile	The tile to check.
z	The max Z level to allow.
noslope	Are foundations disallowed for this house?

Returns: true iff house can be built here.

See also: CanBuildHouseHere()

Definition at line 2541 of file town_cmd.cpp.

References CanBuildHouseHere(), and GetTileMaxZ().

Referenced by CheckFree2x2Area(), and CheckTownBuild2House().

◆ CheckClearTile()

static bool CheckClearTile ( TileIndex tile )

static

Check whether the land can be cleared.

Parameters

tile	Tile to check.

Returns: true if the tile can be cleared.

Definition at line 3368 of file town_cmd.cpp.

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

Referenced by SearchTileForStatue().

◆ CheckforTownRating()

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 3986 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_LENIENT, RATING_ROAD_NEEDED_NEUTRAL, RATING_ROAD_NEEDED_PERMISSIVE, RATING_TUNNEL_BRIDGE_NEEDED_HOSTILE, RATING_TUNNEL_BRIDGE_NEEDED_LENIENT, 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.

◆ CheckFree2x2Area()

static bool CheckFree2x2Area	(	TileIndex	tile,
		int	z,
		bool	noslope
	)

static

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

Parameters

tile	The tile of the house's northernmost tile.
z	The maximum tile z, so all tiles are the same height.
noslope	Are foundations disallowed for this house?

Returns: true iff house can be built here.

See also: CheckBuildHouseSameZ()

Definition at line 2560 of file town_cmd.cpp.

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

Referenced by CheckTownBuild2x2House().

◆ CheckIfAuthorityAllowsNewStation()

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 3828 of file town_cmd.cpp.

References _settings_game, GameSettings::difficulty, and DifficultySettings::town_council_tolerance.

◆ CheckTownBuild2House()

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

static

Checks if a 1x2 or 2x1 building is allowed here, accounting for road layout and tile heights.

Also, tests both building positions that occupy this tile.

Parameters

tile	The tile where the building should be built.
t	The town.
maxz	The maximum Z level, since all tiles must have the same height.
noslope	Are foundations disallowed for this house?
second	The diagdir from the first tile to the second tile.

Definition at line 2649 of file town_cmd.cpp.

References CheckBuildHouseSameZ(), ReverseDiagDir(), TileOffsByDiagDir(), and TownLayoutAllowsHouseHere().

◆ CheckTownBuild2x2House()

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

static

Checks if a 1x2 or 2x1 building is allowed here, accounting for road layout and tile heights.

Also, tests all four building positions that occupy this tile.

Parameters

tile	The tile where the building should be built.
t	The town.
maxz	The maximum Z level, since all tiles must have the same height.
noslope	Are foundations disallowed for this house?

Definition at line 2674 of file town_cmd.cpp.

References CheckFree2x2Area(), DIAGDIR_END, DIAGDIR_SE, ReverseDiagDir(), TileOffsByDiagDir(), and TownLayoutAllows2x2HouseHere().

◆ CheckTownRoadTypes()

bool CheckTownRoadTypes ( )

Check if towns are able to build road.

Returns: true iff the towns are currently able to build road.

Definition at line 982 of file town_cmd.cpp.

References TimerGameCalendar::date, GetTownRoadTypeFirstIntroductionDate(), SetDParam(), ShowErrorMessage(), and WL_CRITICAL.

◆ ClearMakeHouseTile()

static void ClearMakeHouseTile	(	TileIndex	tile,
		Town *	t,
		uint8_t	counter,
		uint8_t	stage,
		HouseID	type,
		uint8_t	random_bits
	)

inlinestatic

Clears tile and builds a house or house part.

Parameters

tile	The tile to build upon.
t	The town which will own the house.
counter	The construction stage counter for the house.
stage	The current construction stage of the house.
type	The type of house.
random_bits	Random bits for newgrf houses to use.

Precondition: The house can be built here.

Definition at line 2471 of file town_cmd.cpp.

References DC_AUTO, DC_EXEC, DC_NO_WATER, HouseSpec::Get(), IncreaseBuildingCount(), Pool< Titem, Tindex, Tgrowth_step, Tmax_size, Tpool_type, Tcache, Tzero >::PoolItem< Tpool >::index, MakeHouseTile(), and CommandCost::Succeeded().

Referenced by MakeTownHouse().

◆ ClearTile_Town()

static CommandCost ClearTile_Town	(	TileIndex	tile,
		DoCommandFlag	flags
	)

static

Callback function to clear a house tile.

Parameters

tile	The tile to clear.
flags	Type of operation.

Returns: The cost of this operation or an error.

Definition at line 717 of file town_cmd.cpp.

References DC_AUTO, and return_cmd_error.

◆ ClearTownHouse()

void ClearTownHouse	(	Town *	t,
		TileIndex	tile
	)

Clear a town house.

Parameters

t	The town which owns the house.
tile	The tile to clear.

Definition at line 2949 of file town_cmd.cpp.

References HouseSpec::building_flags, Town::cache, ChangePopulation(), HouseSpec::Get(), GetHouseNorthPart(), GetHouseType(), IsHouseCompleted(), IsTileType(), MP_HOUSE, TownCache::num_houses, and HouseSpec::population.

◆ ClosestTownFromTile()

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 nullptr if there is no such town.

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

Definition at line 3870 of file town_cmd.cpp.

References CalcClosestTownFromTile(), GetTileType(), GetTownIndex(), HasTownOwnedRoad(), IsRoadDepot(), and MP_ROAD.

Referenced by FindTownForIndustry(), GenerateCompanyName(), AirportResolverObject::GetTown(), ObjectResolverObject::GetTown(), StationResolverObject::GetTown(), AirportTileScopeResolver::GetVariable(), IndustryTileScopeResolver::GetVariable(), ObjectScopeResolver::GetVariable(), LandInfoWindow::OnInit(), and SetDParamsForOwnedBy().

◆ CmdDeleteTown()

CommandCost CmdDeleteTown	(	DoCommandFlag	flags,
		TownID	town_id
	)

Delete a town (scenario editor or worldgen only).

Parameters

flags	Type of operation.
town_id	Town ID to delete.

Returns: Empty cost or an error.

Definition at line 3193 of file town_cmd.cpp.

◆ CmdDoTownAction()

CommandCost CmdDoTownAction	(	DoCommandFlag	flags,
		TownID	town_id,
		uint8_t	action
	)

Do a town action.

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

Parameters

flags	type of operation
town_id	town to do the action at
action	action to perform,

See also: _town_action_proc for the list of available actions

Returns: the cost of this operation or an error

Definition at line 3636 of file town_cmd.cpp.

References Pool< Titem, Tindex, Tgrowth_step, Tmax_size, Tpool_type, Tcache, Tzero >::PoolItem<&_town_pool >::GetIfValid(), and lengthof.

◆ CmdExpandTown()

CommandCost CmdExpandTown	(	DoCommandFlag	flags,
		TownID	town_id,
		uint32_t	grow_amount
	)

Expand a town (scenario editor only).

Parameters

flags	Type of operation.
TownID	Town ID to expand.
grow_amount	Amount to grow, or 0 to grow a random size up to the current amount of houses.

Returns: Empty cost or an error.

Definition at line 3156 of file town_cmd.cpp.

◆ CmdFoundTown()

std::tuple<CommandCost, Money, TownID> CmdFoundTown	(	DoCommandFlag	flags,
		TileIndex	tile,
		TownSize	size,
		bool	city,
		TownLayout	layout,
		bool	random_location,
		uint32_t	townnameparts,
		const std::string &	text
	)

Create a new town.

Parameters

flags	The type of operation.
tile	The coordinates where town is built.
size	The size of the town (

See also: TownSize).

Parameters

city	Should we build a city?
layout	The town road layout (

See also: TownLayout).

Parameters

random_location	Should we use a random location? (randomize `tile` )
townnameparts	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 2115 of file town_cmd.cpp.

References _settings_game, CMD_ERROR, GameSettings::game_creation, GameCreationSettings::town_name, and TSZ_END.

◆ CmdRenameTown()

CommandCost CmdRenameTown	(	DoCommandFlag	flags,
		TownID	town_id,
		const std::string &	text
	)

Rename a town (server-only).

Parameters

flags	type of operation
town_id	town ID to rename
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 2992 of file town_cmd.cpp.

References Town::cached_name, CMD_ERROR, DC_EXEC, 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, Town::UpdateVirtCoord(), Utf8StringLength(), and WC_TOWN_DIRECTORY.

◆ CmdTownCargoGoal()

CommandCost CmdTownCargoGoal	(	DoCommandFlag	flags,
		TownID	town_id,
		TownAcceptanceEffect	tae,
		uint32_t	goal
	)

Change the cargo goal of a town.

Parameters

flags	Type of operation.
town_id	Town ID to cargo game of.
tae	TownEffect to change the game of.
goal	The new goal value.

Returns: Empty cost or an error.

Definition at line 3042 of file town_cmd.cpp.

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

◆ CmdTownGrowthRate()

CommandCost CmdTownGrowthRate	(	DoCommandFlag	flags,
		TownID	town_id,
		uint16_t	growth_rate
	)

Change the growth rate of the town.

Parameters

flags	Type of operation.
town_id	Town ID to cargo game of.
growth_rate	Amount of days between growth, or TOWN_GROWTH_RATE_NONE, or 0 to reset custom growth rate.

Returns: Empty cost or an error.

Definition at line 3093 of file town_cmd.cpp.

◆ CmdTownRating()

CommandCost CmdTownRating	(	DoCommandFlag	flags,
		TownID	town_id,
		CompanyID	company_id,
		int16_t	rating
	)

Change the rating of a company in a town.

Parameters

flags	Type of operation.
town_id	Town ID to change, bit 16..23 =
company_id	Company ID to change.
rating	New rating of company (signed int16_t).

Returns: Empty cost or an error.

Definition at line 3131 of file town_cmd.cpp.

References _current_company, Clamp(), CMD_ERROR, 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<&_company_pool >::IsValidID(), and OWNER_DEITY.

◆ CmdTownSetText()

CommandCost CmdTownSetText	(	DoCommandFlag	flags,
		TownID	town_id,
		const std::string &	text
	)

Set a custom text in the Town window.

Parameters

flags	Type of operation.
town_id	Town ID to change the text of.
text	The new text (empty to remove the text).

Returns: Empty cost or an error.

Definition at line 3071 of file town_cmd.cpp.

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

◆ CountActiveStations()

static int CountActiveStations ( Town * t )

static

Calculates amount of active stations in the range of town (HZB_TOWN_EDGE).

Parameters

t	The town to calculate stations for

Returns: Amount of active stations

Definition at line 3727 of file town_cmd.cpp.

◆ CreateRandomTown()

static Town * CreateRandomTown	(	uint	attempts,
		uint32_t	townnameparts,
		TownSize	size,
		bool	city,
		TownLayout	layout
	)

static

Create a random town somewhere in the world.

Parameters

attempts	How many times should we try?
townnameparts	The name of the town.
size	The size preset of the town.
city	Should we build a city?
layout	The road layout to build.

Returns: The town object, or nullptr if we failed to create a town anywhere.

Definition at line 2334 of file town_cmd.cpp.

◆ DoClearTownHouseHelper()

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 2907 of file town_cmd.cpp.

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

◆ DoCreateTown()

static void DoCreateTown	(	Town *	t,
		TileIndex	tile,
		uint32_t	townnameparts,
		TownSize	size,
		bool	city,
		TownLayout	layout,
		bool	manual
	)

static

Actually create a town.

Parameters

t	The town.
tile	Where to put it.
townnameparts	The town name.
size	The preset size of the town.
city	Should we create a city?
layout	The road layout of the town.
manual	Was the town placed manually?

Definition at line 1990 of file town_cmd.cpp.

References _generating_town, Town::cache, Town::flags, Town::grow_counter, Town::growth_rate, Pool< Titem, Tindex, Tgrowth_step, Tmax_size, Tpool_type, Tcache, Tzero >::PoolItem< Tpool >::index, InitializeBuildingCounts(), TownCache::num_houses, TownCache::population, Town::time_until_rebuild, Ticks::TOWN_GROWTH_TICKS, UpdateTownRadius(), and Town::xy.

◆ DrawTile_Town()

static void DrawTile_Town ( TileInfo * ti )

static

Draw a house and its tile.

This is a tile callback routine.

Parameters

ti	TileInfo of the tile to draw

Definition at line 267 of file town_cmd.cpp.

References HouseSpec::Get(), GetHouseType(), NEW_HOUSE_OFFSET, and TileInfo::tile.

◆ FindFirstCargoWithTownAcceptanceEffect()

const CargoSpec* FindFirstCargoWithTownAcceptanceEffect ( TownAcceptanceEffect 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 3026 of file town_cmd.cpp.

References CargoSpec::Iterate().

Referenced by CmdTownCargoGoal().

◆ FindFurthestFromWater()

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 2274 of file town_cmd.cpp.

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

Referenced by FindNearestGoodCoastalTownSpot().

◆ FindNearestEmptyLand()

static bool FindNearestEmptyLand	(	TileIndex	tile,
		void *
	)

static

CircularTileSearch callback to find the nearest land tile.

Parameters

tile	Start looking from this tile

Definition at line 2294 of file town_cmd.cpp.

References IsTileType(), and MP_CLEAR.

Referenced by FindNearestGoodCoastalTownSpot().

◆ 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 inhibits 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 2311 of file town_cmd.cpp.

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

◆ GenerateTowns()

bool GenerateTowns ( TownLayout layout )

Generate a number of towns with a given layout.

This function is used by the Random Towns button in Scenario Editor as well as in world generation.

Parameters

layout The road layout to build.

Returns: true if towns have been successfully created.

Definition at line 2386 of file town_cmd.cpp.

◆ GenRandomRoadBits()

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 1846 of file town_cmd.cpp.

Referenced by GrowTown().

◆ GetFoundation_Town()

static Foundation GetFoundation_Town	(	TileIndex	tile,
		Slope	tileh
	)

static

Get the foundation for a house.

This is a tile callback routine.

Parameters

tile	The tile to find a foundation for.
tileh	The slope of the tile.

Definition at line 326 of file town_cmd.cpp.

References HouseSpec::callback_mask, CBM_HOUSE_DRAW_FOUNDATIONS, HouseSpec::Get(), GetHouseType(), HouseSpec::grf_prop, HasBit(), NEW_HOUSE_OFFSET, and GRFFilePropsBase< Tcnt >::spritegroup.

◆ GetHouseNorthPart()

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 2924 of file town_cmd.cpp.

References HouseSpec::Get().

Referenced by ClearTownHouse(), GetDistanceFromNearbyHouse(), SearchNearbyHouseClass(), SearchNearbyHouseGRFID(), and SearchNearbyHouseID().

◆ GetMaskOfTownActions()

TownActions GetMaskOfTownActions	(	CompanyID	cid,
		const Town *	t
	)

Get a list of available town authority actions.

Parameters

cid	The company that is querying the town.
t	The town that is queried.

Returns: The bitmasked value of enabled actions.

Definition at line 3579 of file town_cmd.cpp.

References _settings_game, _town_action_costs, EconomySettings::bribe, COMPANY_SPECTATOR, GameSettings::economy, GetAvailableMoney(), lengthof, Town::ratings, TACT_BRIBE, TACT_NONE, and Town::unwanted.

Referenced by TownAuthorityWindow::OnPaint().

◆ GetNormalGrowthRate()

static uint GetNormalGrowthRate ( Town * t )

static

Calculates town growth rate in normal conditions (custom growth rate not set).

If town growth speed is set to None(0) returns the same rate as if it was Normal(2).

Parameters

t	The town to calculate growth rate for

Returns: Calculated growth rate

Note: Unserviced+unfunded towns get an additional malus in UpdateTownGrowth(), so the "320" is actually not better than the "420".

Definition at line 3744 of file town_cmd.cpp.

Referenced by UpdateTownGrowthRate().

◆ GetRating()

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 3931 of file town_cmd.cpp.

References _current_company, _town_rating_test, _town_test_ratings, and Town::ratings.

Referenced by ChangeTownRating(), and CheckforTownRating().

◆ GetTownRadiusGroup()

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 2447 of file town_cmd.cpp.

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

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

◆ GetTownRoadBits()

static RoadBits GetTownRoadBits ( TileIndex tile )

static

Return the RoadBits of a tile, ignoring depot and bay road stops.

Parameters

tile	The tile to check.

Returns: The roadbits of the given tile.

Definition at line 915 of file town_cmd.cpp.

References GetAnyRoadBits(), IsBayRoadStopTile(), IsRoadDepotTile(), and ROAD_NONE.

Referenced by CanFollowRoad(), GrowTown(), GrowTownWithBridge(), GrowTownWithTunnel(), IsNeighborRoadTile(), and IsRoadAllowedHere().

◆ GetTownRoadGridElement()

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

static

Generate the RoadBits of a grid tile.

Parameters

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

Returns: The RoadBit of the current tile regarding the selected town layout.

Definition at line 1117 of file town_cmd.cpp.

References Town::layout, ROAD_NONE, TileIndexToTileIndexDiffC(), and Town::xy.

◆ GetTownRoadType()

RoadType GetTownRoadType ( )

Get the road type that towns should build at this current moment.

They may have built a different type in the past.

Definition at line 926 of file town_cmd.cpp.

References ROADTYPE_ROAD.

Referenced by CanRoadContinueIntoNextTile(), GrowTown(), GrowTownWithBridge(), GrowTownWithRoad(), GrowTownWithTunnel(), and IsRoadAllowedHere().

◆ GetTownRoadTypeFirstIntroductionDate()

static TimerGameCalendar::Date GetTownRoadTypeFirstIntroductionDate ( )

static

Get the calendar date of the earliest town-buildable road type.

Returns: introduction date of earliest road type, or INT32_MAX if none available.

Definition at line 961 of file town_cmd.cpp.

References ROADTYPE_BEGIN, and ROADTYPE_END.

Referenced by CheckTownRoadTypes().

◆ GetWorldPopulation()

uint32_t GetWorldPopulation ( )

Get the total population, the sum of all towns in the world.

Returns: The calculated population of the world

Definition at line 462 of file town_cmd.cpp.

References Pool< Titem, Tindex, Tgrowth_step, Tmax_size, Tpool_type, Tcache, Tzero >::PoolItem<&_town_pool >::Iterate().

◆ GrowTown()

static bool GrowTown ( Town * t )

static

Grow the town.

Parameters

t	The town to grow

Returns: true if we successfully grew the town with a road or house.

Definition at line 1860 of file town_cmd.cpp.

References _current_company, DC_AUTO, DC_EXEC, DC_NO_WATER, DRD_NONE, GenRandomRoadBits(), GetTownRoadBits(), GetTownRoadType(), 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, TileAdd(), ToTileIndexDiff(), TownAllowedToBuildRoads(), and Town::xy.

Referenced by TownTickHandler().

◆ GrowTownAtRoad()

static bool GrowTownAtRoad	(	Town *	t,
		TileIndex	tile
	)

static

Try to grow a town at a given road tile.

Parameters

t	The town to grow.
tile	The road tile to try growing from.

Returns: true if we successfully expanded the town.

Definition at line 1764 of file town_cmd.cpp.

References DIAGDIR_END, Town::layout, Map::Size(), and TL_BETTER_ROADS.

Referenced by GrowTown().

◆ GrowTownInTile()

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 1514 of file town_cmd.cpp.

References ROAD_NONE, and Map::Size().

◆ GrowTownWithBridge()

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 1304 of file town_cmd.cpp.

References Town::cache, CanRoadContinueIntoNextTile(), CircularTileSearch(), CommandFlagsToDCFlags(), DC_EXEC, DIAGDIR_END, DiagDirToRoadBits(), DRD_NONE, GetDisallowedRoadDirections(), GetTileSlope(), GetTownRoadBits(), GetTownRoadType(), InclinedSlope(), IsNormalRoadTile(), IsPlainRailTile(), IsSea(), IsValidTile(), IsWaterTile(), MAX_BRIDGES, TownCache::population, RandomRange(), RedundantBridgeExistsNearby(), ReverseDiagDir(), SLOPE_FLAT, TileAddByDiagDir(), TileOffsByDiagDir(), and TRANSPORT_ROAD.

◆ GrowTownWithExtraHouse()

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 1176 of file town_cmd.cpp.

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

◆ GrowTownWithRoad()

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.

Definition at line 1218 of file town_cmd.cpp.

References DC_AUTO, DC_EXEC, DC_NO_WATER, DRD_NONE, GetTownRoadType(), and Pool< Titem, Tindex, Tgrowth_step, Tmax_size, Tpool_type, Tcache, Tzero >::PoolItem< Tpool >::index.

◆ GrowTownWithTunnel()

static bool GrowTownWithTunnel	(	const Town *	t,
		const TileIndex	tile,
		const DiagDirection	tunnel_dir
	)

static

Grows the town with a tunnel.

First we check if a tunnel is reasonable. If so we check if we are able to build it.

Parameters

t	The current town
tile	The current tile
tunnel_dir	The valid direction in which to grow a tunnel

Returns: true if a tunnel has been built, else false

Definition at line 1385 of file town_cmd.cpp.

References Town::cache, CanRoadContinueIntoNextTile(), CommandFlagsToDCFlags(), DC_EXEC, DIAGDIR_END, DiagDirToRoadBits(), GetTileSlope(), GetTileZ(), GetTownRoadBits(), GetTownRoadType(), InclinedSlope(), IsSlopeWithOneCornerRaised(), IsSteepSlope(), IsValidTile(), TownCache::population, ReverseDiagDir(), TileAddByDiagDir(), TileOffsByDiagDir(), and TRANSPORT_ROAD.

◆ IsCloseToTown()

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	The maximum distance to be accepted.

Returns: true if the tile is within the specified distance.

Definition at line 401 of file town_cmd.cpp.

Referenced by TownCanBePlacedHere().

◆ IsNeighborRoadTile()

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	The current tile.
dir	The target direction.
dist_multi	The distance multiplier.

Returns: true if there is a parallel road.

Definition at line 1006 of file town_cmd.cpp.

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

Referenced by IsRoadAllowedHere().

◆ 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.

Definition at line 1040 of file town_cmd.cpp.

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

◆ IsTileAlignedToGrid()

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	The town layout in effect.

Returns: true if the tile is in the correct location.

Definition at line 2240 of file town_cmd.cpp.

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

Referenced by FindFurthestFromWater().

◆ IsUniqueTownName()

static bool IsUniqueTownName ( const std::string & name )

static

Verifies this custom name is unique.

Only custom names are checked.

Parameters

name	The name to check.

Returns: true if the name is unique

Definition at line 2094 of file town_cmd.cpp.

References Pool< Titem, Tindex, Tgrowth_step, Tmax_size, Tpool_type, Tcache, Tzero >::PoolItem<&_town_pool >::Iterate(), and Town::name.

Referenced by CmdRenameTown().

◆ MakeTownHouse()

static void MakeTownHouse	(	TileIndex	tile,
		Town *	t,
		uint8_t	counter,
		uint8_t	stage,
		HouseID	type,
		uint8_t	random_bits
	)

static

Write house information into the map.

For multi-tile houses, all tiles are marked.

Parameters

town	The town related to this house
t	The tile to build on. If a multi-tile house, this is the northern-most tile.
counter	The counter of the construction stage.
stage	The current construction stage.
The	type of house.
random_bits	Random bits for newgrf houses to use.

Precondition: The house can be built here.

Definition at line 2494 of file town_cmd.cpp.

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

◆ RandomDiagDir()

static DiagDirection RandomDiagDir ( )

inlinestatic

Return a random direction.

Returns: a random direction

Definition at line 258 of file town_cmd.cpp.

References DIAGDIR_END, and RandomRange().

◆ RedundantBridgeExistsNearby()

static bool RedundantBridgeExistsNearby	(	TileIndex	tile,
		void *	user_data
	)

static

CircularTileSearch proc which checks for a nearby parallel bridge to avoid building redundant bridges.

Parameters

tile	The tile to search.
user_data	Reference to the valid direction of the proposed bridge.

Returns: true if another bridge exists, else false.

Definition at line 1279 of file town_cmd.cpp.

References GetTileSlope(), GetTunnelBridgeTransportType(), InclinedSlope(), IsBridgeTile(), IsValidTile(), ReverseDiagDir(), and TRANSPORT_ROAD.

Referenced by GrowTownWithBridge().

◆ RemoveNearbyStations()

static void RemoveNearbyStations	(	Town *	t,
		TileIndex	tile,
		BuildingFlags	flags
	)

static

Remove stations from nearby station list if a town is no longer in the catchment area of each.

To improve performance only checks stations that cover the provided house area (doesn't need to contain an actual house).

Parameters

t	Town to work on.
tile	Location of house area (north tile).
flags	BuildingFlags containing the size of house area.

Definition at line 476 of file town_cmd.cpp.

References Town::stations_near.

◆ RoadTypesAllowHouseHere()

static bool RoadTypesAllowHouseHere ( TileIndex t )

inlinestatic

Checks whether at least one surrounding road allows to build a house here.

Parameters

t	The tile where the house will be built.

Returns: true if at least one surrounding roadtype allows building houses here.

Definition at line 1451 of file town_cmd.cpp.

References IsAnyRoadStopTile(), IsTileType(), IsValidTile(), MP_ROAD, and ToTileIndexDiff().

Referenced by CanBuildHouseHere().

◆ SearchTileForStatue()

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 3390 of file town_cmd.cpp.

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

Referenced by TownActionBuildStatue().

◆ SetTownRatingTestMode()

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 3911 of file town_cmd.cpp.

References _town_rating_test, and _town_test_ratings.

Referenced by CommandHelperBase::InternalDoAfter(), and CommandHelperBase::InternalExecuteValidateTestAndPrepExec().

◆ TestTownOwnsBridge()

static bool TestTownOwnsBridge	(	TileIndex	tile,
		const Town *	t
	)

static

Check if a town 'owns' a bridge.

Bridges do not directly have an owner, so we check the tiles adjacent to the bridge ends. If either adjacent tile belongs to the town then it will be assumed that the town built the bridge.

Parameters

tile	The bridge tile to test
t	The town we are interested in

Returns: true If town 'owns' a bridge.

Definition at line 94 of file town_cmd.cpp.

References GetOtherTunnelBridgeEnd(), GetTownIndex(), GetTunnelBridgeDirection(), Pool< Titem, Tindex, Tgrowth_step, Tmax_size, Tpool_type, Tcache, Tzero >::PoolItem< Tpool >::index, IsTileOwner(), IsTileType(), MP_ROAD, OWNER_TOWN, ReverseDiagDir(), and TileOffsByDiagDir().

Referenced by Town::~Town().

◆ TileLoop_Town()

static void TileLoop_Town ( TileIndex tile )

static

Tile callback function.

Tile callback function. Periodic tick handler for the tiles of a town.

Parameters

tile	been asked to do its stuff

Definition at line 605 of file town_cmd.cpp.

References GetHouseType(), and NEW_HOUSE_OFFSET.

◆ TownActionAdvertiseLarge()

static CommandCost TownActionAdvertiseLarge	(	Town *	t,
		DoCommandFlag	flags
	)

static

Perform the "large advertising campaign" town action.

Parameters

t	The town to advertise in.
flags	Type of operation.

Returns: An empty cost.

Definition at line 3326 of file town_cmd.cpp.

References DC_EXEC.

◆ TownActionAdvertiseMedium()

static CommandCost TownActionAdvertiseMedium	(	Town *	t,
		DoCommandFlag	flags
	)

static

Perform the "medium advertising campaign" town action.

Parameters

t	The town to advertise in.
flags	Type of operation.

Returns: An empty cost.

Definition at line 3312 of file town_cmd.cpp.

References DC_EXEC.

◆ TownActionAdvertiseSmall()

static CommandCost TownActionAdvertiseSmall	(	Town *	t,
		DoCommandFlag	flags
	)

static

Perform the "small advertising campaign" town action.

Parameters

t	The town to advertise in.
flags	Type of operation.

Returns: An empty cost.

Definition at line 3298 of file town_cmd.cpp.

References DC_EXEC.

◆ TownActionBribe()

static CommandCost TownActionBribe	(	Town *	t,
		DoCommandFlag	flags
	)

static

Perform the "bribe" town action.

Parameters

t	The town to bribe.
flags	Type of operation.

Returns: An empty cost.

Definition at line 3524 of file town_cmd.cpp.

References _current_company, Chance16(), DC_EXEC, INVALID_STRING_ID, IsLocalCompany(), SpecializedStation< Station, false >::Iterate(), GoodsEntry::rating, Town::ratings, ShowErrorMessage(), Town::unwanted, and WL_INFO.

◆ TownActionBuildStatue()

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 3433 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(), DC_EXEC, INVALID_TILE, MarkTileDirtyByTile(), OBJECT_STATUE, OWNER_NONE, Backup< T >::Restore(), return_cmd_error, SearchTileForStatue(), SetBit(), Town::statues, and Town::xy.

◆ TownActionBuyRights()

static CommandCost TownActionBuyRights	(	Town *	t,
		DoCommandFlag	flags
	)

static

Perform the "buy exclusive transport rights" town action.

Parameters

t	The town to buy exclusivity in.
flags	Type of operation.

Returns: An empty cost.

Definition at line 3491 of file town_cmd.cpp.

References _current_company, _settings_game, CMD_ERROR, DC_EXEC, GameSettings::economy, Town::exclusive_counter, EconomySettings::exclusive_rights, Town::exclusivity, and INVALID_COMPANY.

◆ TownActionFundBuildings()

static CommandCost TownActionFundBuildings	(	Town *	t,
		DoCommandFlag	flags
	)

static

Perform the "fund new buildings" town action.

Parameters

t	The town to fund buildings in.
flags	Type of operation.

Returns: An empty cost.

Definition at line 3458 of file town_cmd.cpp.

References _settings_game, CMD_ERROR, DC_EXEC, GameSettings::economy, EconomySettings::fund_buildings, Town::fund_buildings_months, Town::grow_counter, Town::growth_rate, Pool< Titem, Tindex, Tgrowth_step, Tmax_size, Tpool_type, Tcache, Tzero >::PoolItem< Tpool >::index, SetWindowDirty(), Ticks::TOWN_GROWTH_TICKS, UpdateTownGrowth(), and WC_TOWN_VIEW.

◆ TownActionRoadRebuild()

static CommandCost TownActionRoadRebuild	(	Town *	t,
		DoCommandFlag	flags
	)

static

Perform the "local road reconstruction" town action.

Parameters

t	The town to grief in.
flags	Type of operation.

Returns: An empty cost.

Definition at line 3340 of file town_cmd.cpp.

References _current_company, _settings_game, AddNewsItem(), AI::BroadcastNewEvent(), CMD_ERROR, DC_EXEC, GameSettings::economy, EconomySettings::fund_roads, GetString(), Pool< Titem, Tindex, Tgrowth_step, Tmax_size, Tpool_type, Tcache, Tzero >::PoolItem< Tpool >::index, NF_NORMAL, NR_NONE, NR_TOWN, NT_GENERAL, Town::road_build_months, SetDParam(), SetDParamStr(), and TimerGameEconomy::UsingWallclockUnits().

◆ TownAllowedToBuildRoads()

static bool TownAllowedToBuildRoads ( )

inlinestatic

Check if the town is allowed to build roads.

Returns: true If the town is allowed to build roads.

Definition at line 1492 of file town_cmd.cpp.

References _generating_world, _settings_game, EconomySettings::allow_town_roads, and GameSettings::economy.

Referenced by CanFollowRoad(), GrowTown(), TownLayoutAllows2x2HouseHere(), and TownLayoutAllowsHouseHere().

◆ TownCanBePlacedHere()

static CommandCost TownCanBePlacedHere ( TileIndex tile )

static

Check if it's possible to place a town on a given tile.

Parameters

tile	The tile to check.

Returns: A zero cost if allowed, otherwise an error.

Definition at line 2069 of file town_cmd.cpp.

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

◆ TownCanGrowRoad()

static bool TownCanGrowRoad ( TileIndex tile )

static

Test if town can grow road onto a specific tile.

Parameters

tile	Tile to build upon.

Returns: true iff the tile's road type don't prevent extending the road.

Definition at line 1479 of file town_cmd.cpp.

References IsTileType(), and MP_ROAD.

◆ TownGenerateCargo()

static void TownGenerateCargo	(	Town *	t,
		CargoID	ct,
		uint	amount,
		StationFinder &	stations,
		bool	affected_by_recession
	)

static

Generate cargo for a house, scaled by the current economy scale.

Parameters

t	The current town.
ct	Type of cargo to generate, usually CT_PASSENGERS or CT_MAIL.
amount	The number of cargo units.
stations	Available stations for this house.
affected_by_recession	Is this cargo halved during recessions?

Definition at line 538 of file town_cmd.cpp.

References EconomyIsInRecession(), TransportedCargoStat< Tstorage >::new_act, TransportedCargoStat< Tstorage >::new_max, ScaleByCargoScale(), and Town::supplied.

◆ TownGenerateCargoBinominal()

static void TownGenerateCargoBinominal	(	Town *	t,
		TownProductionEffect	tpe,
		uint8_t	rate,
		StationFinder &	stations
	)

static

Generate cargo for a house using the binominal algorithm.

Parameters

t	The current town.
tpe	The town production effect.
rate	The town's product rate for this production.
stations	Available stations for this house.

Definition at line 582 of file town_cmd.cpp.

References CargoSpec::town_production_cargoes.

◆ TownGenerateCargoOriginal()

static void TownGenerateCargoOriginal	(	Town *	t,
		TownProductionEffect	tpe,
		uint8_t	rate,
		StationFinder &	stations
	)

static

Generate cargo for a house using the original algorithm.

Parameters

t	The current town.
tpe	The town production effect.
rate	The town's product rate for this production.
stations	Available stations for this house.

Definition at line 562 of file town_cmd.cpp.

References CargoSpec::town_production_cargoes.

◆ TownLayoutAllows2x2HouseHere()

static bool TownLayoutAllows2x2HouseHere	(	Town *	t,
		TileIndex	tile
	)

inlinestatic

Checks if the current town layout allows a 2x2 building here.

Parameters

t	The town.
tile	The tile to check.

Returns: true iff town layout allows a 2x2 building here.

Note: see layouts

Definition at line 2612 of file town_cmd.cpp.

References Town::layout, TileIndexToTileIndexDiffC(), TL_2X2_GRID, TL_3X3_GRID, TownAllowedToBuildRoads(), TileIndexDiffC::x, Town::xy, and TileIndexDiffC::y.

Referenced by CheckTownBuild2x2House().

◆ TownLayoutAllowsHouseHere()

static bool TownLayoutAllowsHouseHere	(	Town *	t,
		TileIndex	tile
	)

inlinestatic

Checks if the current town layout allows building here.

Parameters

t	The town.
tile	The tile to check.

Returns: true iff town layout allows building here.

Note: see layouts

Definition at line 2581 of file town_cmd.cpp.

References Town::layout, TileIndexToTileIndexDiffC(), TL_2X2_GRID, TL_3X3_GRID, TownAllowedToBuildRoads(), TileIndexDiffC::x, Town::xy, and TileIndexDiffC::y.

Referenced by CheckTownBuild2House(), and TryBuildTownHouse().

◆ TownTickHandler()

static void TownTickHandler ( Town * t )

static

Handle the town tick for a single town, by growing the town if desired.

Parameters

t	The town to try growing.

Definition at line 884 of file town_cmd.cpp.

References Town::flags, Town::grow_counter, Town::growth_rate, GrowTown(), HasBit(), Ticks::TOWN_GROWTH_TICKS, and TOWN_IS_GROWING.

◆ TryBuildTownHouse()

static bool TryBuildTownHouse	(	Town *	t,
		TileIndex	tile
	)

static

Tries to build a house at this tile.

Parameters

t	The town the house will belong to.
tile	The tile to try building on.

Returns: false iff no house can be built on this tile.

Definition at line 2730 of file town_cmd.cpp.

References _settings_game, CanBuildHouseHere(), GameSettings::game_creation, GetTileMaxZ(), GetTileSlope(), GetTownRadiusGroup(), GameCreationSettings::landscape, and TownLayoutAllowsHouseHere().

Referenced by GrowTownWithExtraHouse().

◆ UpdateTownGrowCounter()

static void UpdateTownGrowCounter	(	Town *	t,
		uint16_t	prev_growth_rate
	)

static

Updates town grow counter after growth rate change.

Preserves relative house builting progress whenever it can.

Parameters

t	The town to calculate grow counter for
prev_growth_rate	Town growth rate before it changed (one that was used with grow counter to be updated)

Definition at line 3712 of file town_cmd.cpp.

Referenced by UpdateTownGrowthRate().

◆ UpdateTownGrowth()

static void UpdateTownGrowth ( Town * t )

static

Updates town growth state (whether it is growing or not).

Parameters

t	The town to update growth for

Definition at line 3784 of file town_cmd.cpp.

References _settings_game, ClrBit(), GameSettings::economy, Town::flags, Town::fund_buildings_months, Pool< Titem, Tindex, Tgrowth_step, Tmax_size, Tpool_type, Tcache, Tzero >::PoolItem< Tpool >::index, SetWindowDirty(), EconomySettings::town_growth_rate, TOWN_IS_GROWING, UpdateTownGrowthRate(), and WC_TOWN_VIEW.

Referenced by CmdTownCargoGoal(), and TownActionFundBuildings().

◆ UpdateTownGrowthRate()

static void UpdateTownGrowthRate ( Town * t )

static

Updates town growth rate.

Parameters

t	The town to update growth rate for

Definition at line 3771 of file town_cmd.cpp.

References Town::flags, GetNormalGrowthRate(), Town::growth_rate, HasBit(), Pool< Titem, Tindex, Tgrowth_step, Tmax_size, Tpool_type, Tcache, Tzero >::PoolItem< Tpool >::index, SetWindowDirty(), TOWN_CUSTOM_GROWTH, UpdateTownGrowCounter(), and WC_TOWN_VIEW.

Referenced by UpdateTownGrowth().

◆ UpdateTownMaxPass()

void UpdateTownMaxPass ( Town * t )

Update the maximum amount of montly passengers and mail for a town, based on its population.

Parameters

t	The town to update.

Definition at line 1966 of file town_cmd.cpp.

References Town::cache, TransportedCargoStat< Tstorage >::old_max, TownCache::population, ScaleByCargoScale(), Town::supplied, CargoSpec::town_production_cargoes, TPE_MAIL, and TPE_PASSENGERS.

◆ UpdateTownRadius()

void UpdateTownRadius ( Town * t )

Update the cached town zone radii of a town, based on the number of houses.

Parameters

t	The town to update.

Definition at line 1919 of file town_cmd.cpp.

References Town::cache, TownCache::num_houses, and TownCache::squared_town_zone_radius.

Referenced by DoCreateTown().

◆ UpdateTownRating()

static void UpdateTownRating ( Town * t )

static

Monthly callback to update town and station ratings.

Parameters

t	The town to update.

Definition at line 3674 of file town_cmd.cpp.

References Pool< Titem, Tindex, Tgrowth_step, Tmax_size, Tpool_type, Tcache, Tzero >::PoolItem<&_company_pool >::Iterate(), RATING_GROWTH_MAXIMUM, RATING_GROWTH_UP_STEP, and Town::ratings.

Variable Documentation

◆ _tile_type_town_procs

const TileTypeProcs _tile_type_town_procs

extern

Initial value:

= {
  DrawTile_Town,           
  GetSlopePixelZ_Town,     
  ClearTile_Town,          
  AddAcceptedCargo_Town,   
  GetTileDesc_Town,        
  GetTileTrackStatus_Town, 
  nullptr,                    
  AnimateTile_Town,        
  TileLoop_Town,           
  ChangeTileOwner_Town,    
  AddProducedCargo_Town,   
  nullptr,                    
  GetFoundation_Town,      
  TerraformTile_Town,      
}

Tile callback functions for a town.

Definition at line 51 of file landscape.cpp.

◆ _town_action_costs

const uint8_t _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 3288 of file town_cmd.cpp.

Referenced by GetMaskOfTownActions().

◆ _town_action_proc

TownActionProc* const _town_action_proc[]

static

Initial value:

= {
  TownActionAdvertiseSmall,
  TownActionAdvertiseMedium,
  TownActionAdvertiseLarge,
  TownActionRoadRebuild,
  TownActionBuildStatue,
  TownActionFundBuildings,
  TownActionBuyRights,
  TownActionBribe
}

Definition at line 3562 of file town_cmd.cpp.

◆ _town_draw_tile_procs

TownDrawTileProc* const _town_draw_tile_procs[1]

static

Initial value:

= {
  TownDrawHouseLift
}

Definition at line 249 of file town_cmd.cpp.

Data Structures

Typedefs

Enumerations

Functions

Variables

Detailed Description

Function Documentation

◆ AddAcceptedCargoSetMask()

◆ AdvanceHouseConstruction()

◆ AdvanceSingleHouseConstruction()

◆ AlignTileToGrid()

◆ AnimateTile_Town()

◆ BuildTownHouse()

◆ CalcClosestTownFromTile()

◆ CanBuildHouseHere()

◆ CanFollowRoad()

◆ CanRoadContinueIntoNextTile()

◆ ChangePopulation()

◆ ChangeTownRating()

◆ CheckBuildHouseSameZ()

◆ CheckClearTile()

◆ CheckforTownRating()

◆ CheckFree2x2Area()

◆ CheckIfAuthorityAllowsNewStation()

◆ CheckTownBuild2House()

◆ CheckTownBuild2x2House()

◆ CheckTownRoadTypes()

◆ ClearMakeHouseTile()

◆ ClearTile_Town()

◆ ClearTownHouse()

◆ ClosestTownFromTile()

◆ CmdDeleteTown()

◆ CmdDoTownAction()

◆ CmdExpandTown()

◆ CmdFoundTown()

◆ CmdRenameTown()

◆ CmdTownCargoGoal()

◆ CmdTownGrowthRate()

◆ CmdTownRating()

◆ CmdTownSetText()

◆ CountActiveStations()

◆ CreateRandomTown()

◆ DoClearTownHouseHelper()

◆ DoCreateTown()

◆ DrawTile_Town()

◆ FindFirstCargoWithTownAcceptanceEffect()

◆ FindFurthestFromWater()

◆ FindNearestEmptyLand()

◆ FindNearestGoodCoastalTownSpot()

◆ GenerateTowns()

◆ GenRandomRoadBits()

◆ GetFoundation_Town()

◆ GetHouseNorthPart()

◆ GetMaskOfTownActions()

◆ GetNormalGrowthRate()

◆ GetRating()

◆ GetTownRadiusGroup()

◆ GetTownRoadBits()

◆ GetTownRoadGridElement()

◆ GetTownRoadType()

◆ GetTownRoadTypeFirstIntroductionDate()

◆ GetWorldPopulation()

◆ GrowTown()

◆ GrowTownAtRoad()

◆ GrowTownInTile()

◆ GrowTownWithBridge()

◆ GrowTownWithExtraHouse()

◆ GrowTownWithRoad()

◆ GrowTownWithTunnel()

◆ IsCloseToTown()

◆ IsNeighborRoadTile()

◆ IsRoadAllowedHere()

◆ IsTileAlignedToGrid()

◆ IsUniqueTownName()

◆ MakeTownHouse()

◆ RandomDiagDir()

◆ RedundantBridgeExistsNearby()

◆ RemoveNearbyStations()

◆ RoadTypesAllowHouseHere()

◆ SearchTileForStatue()