Base functions related to the map and distances on them. More...

#include "stdafx.h"
#include "debug.h"
#include "core/alloc_func.hpp"
#include "water_map.h"
#include "error_func.h"
#include "string_func.h"
#include "pathfinder/water_regions.h"
#include "safeguards.h"

Functions
TileIndex	TileAddWrap (TileIndex tile, int addx, int addy)
	This function checks if we add addx/addy to tile, if we do wrap around the edges. More...

uint	DistanceManhattan (TileIndex t0, TileIndex t1)
	Gets the Manhattan distance between the two given tiles. More...

uint	DistanceSquare (TileIndex t0, TileIndex t1)
	Gets the 'Square' distance between the two given tiles. More...

uint	DistanceMax (TileIndex t0, TileIndex t1)
	Gets the biggest distance component (x or y) between the two given tiles. More...

uint	DistanceMaxPlusManhattan (TileIndex t0, TileIndex t1)
	Gets the biggest distance component (x or y) between the two given tiles plus the Manhattan distance, i.e. More...

uint	DistanceFromEdge (TileIndex tile)
	Param the minimum distance to an edge. More...

uint	DistanceFromEdgeDir (TileIndex tile, DiagDirection dir)
	Gets the distance to the edge of the map in given direction. More...

bool	CircularTileSearch (TileIndex tile, uint size, TestTileOnSearchProc proc, void user_data)
	Function performing a search around a center tile and going outward, thus in circle. More...

bool	CircularTileSearch (TileIndex tile, uint radius, uint w, uint h, TestTileOnSearchProc proc, void user_data)
	Generalized circular search allowing for rectangles and a hole. More...

uint	GetClosestWaterDistance (TileIndex tile, bool water)
	Finds the distance for the closest tile with water/land given a tile. More...

Variables
const TileIndexDiffC	_tileoffs_by_axis []
	'Lookup table' for tile offsets given an Axis More...

const TileIndexDiffC	_tileoffs_by_diagdir []
	'Lookup table' for tile offsets given a DiagDirection More...

const TileIndexDiffC	_tileoffs_by_dir []
	'Lookup table' for tile offsets given a Direction More...

Detailed Description

Base functions related to the map and distances on them.

Definition in file map.cpp.

Function Documentation

◆ CircularTileSearch() [1/2]

bool CircularTileSearch	(	TileIndex *	tile,
		uint	radius,
		uint	w,
		uint	h,
		TestTileOnSearchProc	proc,
		void *	user_data
	)

Generalized circular search allowing for rectangles and a hole.

Function performing a search around a center rectangle and going outward. The center rectangle is left out from the search. To do a rectangular search without a hole, set either h or w to zero. Every tile will be tested by means of the callback function proc, which will determine if yes or no the given tile meets criteria of search.

Parameters

tile	to start the search from. Upon completion, it will return the tile matching the search. This tile should be directly north of the hole (if any).
radius	How many tiles to search outwards. Note: This is a radius and thus different from the size parameter of the other CircularTileSearch function, which is a diameter.
w	the width of the inner rectangle
h	the height of the inner rectangle
proc	callback testing function pointer.
user_data	to be passed to the callback function. Depends on the implementation

Returns: result of the search

Precondition: proc != nullptr; radius > 0

Definition at line 285 of file map.cpp.

◆ CircularTileSearch() [2/2]

bool CircularTileSearch	(	TileIndex *	tile,
		uint	size,
		TestTileOnSearchProc	proc,
		void *	user_data
	)

Function performing a search around a center tile and going outward, thus in circle.

Although it really is a square search... Every tile will be tested by means of the callback function proc, which will determine if yes or no the given tile meets criteria of search.

Parameters

tile	to start the search from. Upon completion, it will return the tile matching the search
size	number of tiles per side of the desired search area
proc	callback testing function pointer.
user_data	to be passed to the callback function. Depends on the implementation

Returns: result of the search

Precondition: proc != nullptr; size > 0

Definition at line 247 of file map.cpp.

References DIR_N, and TileAddByDir().

Referenced by ChopLumberMillTrees(), CreateRivers(), FindNearestGoodCoastalTownSpot(), GetDistanceFromNearbyHouse(), GrowTownWithBridge(), TownActionBuildStatue(), and TryBuildTransmitter().

◆ DistanceFromEdge()

uint DistanceFromEdge ( TileIndex tile )

Param the minimum distance to an edge.

shortest distance from any edge of the map

Parameters

tile	the tile to get the distance from

Returns: the distance from the edge in tiles

Definition at line 206 of file map.cpp.

References Map::SizeX(), Map::SizeY(), TileX(), and TileY().

Referenced by GrowTownWithExtraHouse(), IsRoadAllowedHere(), and TownCanBePlacedHere().

◆ DistanceFromEdgeDir()

uint DistanceFromEdgeDir	(	TileIndex	tile,
		DiagDirection	dir
	)

Gets the distance to the edge of the map in given direction.

distance from the map edge in given direction

Parameters

tile	the tile to get the distance from
dir	the direction of interest

Returns: the distance from the edge in tiles

Definition at line 223 of file map.cpp.

References _settings_game, GameSettings::construction, DIAGDIR_NE, DIAGDIR_NW, DIAGDIR_SE, DIAGDIR_SW, ConstructionSettings::freeform_edges, Map::MaxX(), Map::MaxY(), TileX(), and TileY().

Referenced by CheckScaledDistanceFromEdge(), and GetOtherAqueductEnd().

◆ DistanceManhattan()

uint DistanceManhattan	(	TileIndex	t0,
		TileIndex	t1
	)

Gets the Manhattan distance between the two given tiles.

also known as L1-Norm. Is the shortest distance one could go over diagonal tracks (or roads)

The Manhattan distance is the sum of the delta of both the X and Y component. Also known as L1-Norm

Parameters

t0	the start tile
t1	the end tile

Returns: the distance

Definition at line 146 of file map.cpp.

References Delta(), TileX(), and TileY().

Referenced by AirportGetNearestTown(), CheckSubsidyDistance(), DeleteStaleLinks(), FindDeletedWaypointCloseTo(), FindSubsidyPassengerRoute(), FlowRiver(), FlowsDown(), GetClosestObject(), CargoPacket::GetDistance(), GetDistanceFromNearbyHouse(), IndustriesScopeResolver::GetVariable(), ObjectScopeResolver::GetVariable(), VpSetPresizeRange(), and YapfTrainCheckReverse().

◆ DistanceMax()

uint DistanceMax	(	TileIndex	t0,
		TileIndex	t1
	)

Gets the biggest distance component (x or y) between the two given tiles.

also known as L-Infinity-Norm

Also known as L-Infinity-Norm.

Parameters

t0	the start tile
t1	the end tile

Returns: the distance

Definition at line 178 of file map.cpp.

References Delta(), TileX(), and TileY().

Referenced by Station::AddIndustryToDeliver(), CheckIfFarEnoughFromConflictingIndustry(), and CheckIfIndustryIsAllowed().

◆ DistanceMaxPlusManhattan()

uint DistanceMaxPlusManhattan	(	TileIndex	t0,
		TileIndex	t1
	)

Gets the biggest distance component (x or y) between the two given tiles plus the Manhattan distance, i.e.

Max + Manhattan.

two times the biggest distance component and once the smallest component.

Parameters

t0	the start tile
t1	the end tile

Returns: the distance

Definition at line 194 of file map.cpp.

References Delta(), TileX(), and TileY().

Referenced by DemandCalculator::CalcDemand().

◆ DistanceSquare()

uint DistanceSquare	(	TileIndex	t0,
		TileIndex	t1
	)

Gets the 'Square' distance between the two given tiles.

euclidian- or L2-Norm squared

The 'Square' distance is the square of the shortest (straight line) distance between the two tiles. Also known as euclidian- or L2-Norm squared.

Parameters

t0	the start tile
t1	the end tile

Returns: the distance

Definition at line 163 of file map.cpp.

References TileX(), and TileY().

Referenced by CmdBuildBridge(), CmdBuildTunnel(), GetTownRadiusGroup(), IndustriesScopeResolver::GetVariable(), and ObjectScopeResolver::GetVariable().

◆ GetClosestWaterDistance()

uint GetClosestWaterDistance	(	TileIndex	tile,
		bool	water
	)

Finds the distance for the closest tile with water/land given a tile.

Parameters

tile	the tile to find the distance too
water	whether to find water or land

Returns: distance to nearest water (max 0x7F) / land (max 0x1FF; 0x200 if there is no land)

Definition at line 329 of file map.cpp.

References HasTileWaterGround().

Referenced by FindFurthestFromWater(), and IndustriesScopeResolver::GetVariable().

◆ TileAddWrap()

TileIndex TileAddWrap	(	TileIndex	tile,
		int	addx,
		int	addy
	)

This function checks if we add addx/addy to tile, if we do wrap around the edges.

For example, tile = (10,2) and addx = +3 and addy = -4. This function will now return INVALID_TILE, because the y is wrapped. This is needed in for example, farmland. When the tile is not wrapped, the result will be tile + TileDiffXY(addx, addy)

Parameters

tile	the 'starting' point of the adding
addx	the amount of tiles in the X direction to add
addy	the amount of tiles in the Y direction to add

Returns: translated tile, or INVALID_TILE when it would've wrapped.

Definition at line 97 of file map.cpp.

Referenced by CheckIfIndustryTilesAreFree(), CmdRemoveRoadStop(), and CountMapSquareAround().

Variable Documentation

◆ _tileoffs_by_axis

const TileIndexDiffC _tileoffs_by_axis[]

extern

Initial value:

= {
  { 1,  0}, 
  { 0,  1}, 
}

'Lookup table' for tile offsets given an Axis

Referenced by TileOffsByAxis().

◆ _tileoffs_by_diagdir

const TileIndexDiffC _tileoffs_by_diagdir[]

extern

Initial value:

= {
  {-1,  0}, 
  { 0,  1}, 
  { 1,  0}, 
  { 0, -1}  
}

'Lookup table' for tile offsets given a DiagDirection

Referenced by TileIndexDiffCByDiagDir(), and TileOffsByDiagDir().

◆ _tileoffs_by_dir

const TileIndexDiffC _tileoffs_by_dir[]

extern

Initial value:

= {
  {-1, -1}, 
  {-1,  0}, 
  {-1,  1}, 
  { 0,  1}, 
  { 1,  1}, 
  { 1,  0}, 
  { 1, -1}, 
  { 0, -1}  
}

'Lookup table' for tile offsets given a Direction

Referenced by TileIndexDiffCByDir(), and TileOffsByDir().

Functions

Variables

Detailed Description

Function Documentation

◆ CircularTileSearch() [1/2]

◆ CircularTileSearch() [2/2]

◆ DistanceFromEdge()

◆ DistanceFromEdgeDir()

◆ DistanceManhattan()

◆ DistanceMax()

◆ DistanceMaxPlusManhattan()

◆ DistanceSquare()

◆ GetClosestWaterDistance()

◆ TileAddWrap()

Variable Documentation

◆ _tileoffs_by_axis

◆ _tileoffs_by_diagdir

◆ _tileoffs_by_dir