Different functions related to conversions between directions. More...

#include "direction_type.h"

Functions
bool	IsValidDiagDirection (DiagDirection d)
	Checks if an integer value is a valid DiagDirection. More...

bool	IsValidDirection (Direction d)
	Checks if an integer value is a valid Direction. More...

bool	IsValidAxis (Axis d)
	Checks if an integer value is a valid Axis. More...

Direction	ReverseDir (Direction d)
	Return the reverse of a direction. More...

DirDiff	DirDifference (Direction d0, Direction d1)
	Calculate the difference between two directions. More...

DirDiff	ChangeDirDiff (DirDiff d, DirDiff delta)
	Applies two differences together. More...

Direction	ChangeDir (Direction d, DirDiff delta)
	Change a direction by a given difference. More...

DiagDirection	ReverseDiagDir (DiagDirection d)
	Returns the reverse direction of the given DiagDirection. More...

DiagDirDiff	DiagDirDifference (DiagDirection d0, DiagDirection d1)
	Calculate the difference between two DiagDirection values. More...

DiagDirection	ChangeDiagDir (DiagDirection d, DiagDirDiff delta)
	Applies a difference on a DiagDirection. More...

DiagDirection	DirToDiagDir (Direction dir)
	Convert a Direction to a DiagDirection. More...

Direction	DiagDirToDir (DiagDirection dir)
	Convert a DiagDirection to a Direction. More...

Axis	OtherAxis (Axis a)
	Select the other axis as provided. More...

Axis	DiagDirToAxis (DiagDirection d)
	Convert a DiagDirection to the axis. More...

DiagDirection	AxisToDiagDir (Axis a)
	Converts an Axis to a DiagDirection. More...

Direction	AxisToDirection (Axis a)
	Converts an Axis to a Direction. More...

DiagDirection	XYNSToDiagDir (Axis xy, uint ns)
	Convert an axis and a flag for north/south into a DiagDirection. More...

bool	IsDiagonalDirection (Direction dir)
	Checks if a given Direction is diagonal. More...

Detailed Description

Different functions related to conversions between directions.

Definition in file direction_func.h.

Function Documentation

◆ AxisToDiagDir()

DiagDirection AxisToDiagDir ( Axis a )

inline

Converts an Axis to a DiagDirection.

This function returns the DiagDirection which belongs to the axis. As 2 directions are mapped to an axis this function returns the one which points to south, either south-west (on X axis) or south-east (on Y axis)

Parameters

a The axis

Returns: The direction pointed to south

Definition at line 232 of file direction_func.h.

References IsValidAxis().

Referenced by AutoslopeCheckForAxis(), CalculateRoadStopCost(), CmdBuildLongRoad(), GetNorthernBridgeEnd(), GetSouthernBridgeEnd(), MarkDirtyAdjacentLevelCrossingTiles(), TrainApproachingCrossing(), UpdateAdjacentLevelCrossingTilesOnLevelCrossingRemoval(), and UpdateLevelCrossing().

◆ AxisToDirection()

Direction AxisToDirection ( Axis a )

inline

Converts an Axis to a Direction.

This function returns the Direction which belongs to the axis. As 2 directions are mapped to an axis this function returns the one which points to south, either south-west (on X axis) or south-east (on Y axis)

Parameters

a The axis

Returns: The direction pointed to south

Definition at line 249 of file direction_func.h.

References IsValidAxis().

◆ ChangeDiagDir()

DiagDirection ChangeDiagDir	(	DiagDirection	d,
		DiagDirDiff	delta
	)

inline

Applies a difference on a DiagDirection.

This function applies a difference on a DiagDirection and returns the new DiagDirection.

Parameters

d	The DiagDirection
delta	The difference to apply on

Returns: The new direction which was calculated

Definition at line 149 of file direction_func.h.

References IsValidDiagDirection().

Referenced by AircraftGetEntryPoint(), IsNeighborRoadTile(), RiverMakeWider(), and VehicleExitDir().

◆ ChangeDir()

Direction ChangeDir	(	Direction	d,
		DirDiff	delta
	)

inline

Change a direction by a given difference.

This functions returns a new direction of the given direction which is rotated by the given difference.

Parameters

d	The direction to get a new direction from
delta	The offset/drift applied to the direction

Returns: The new direction

Definition at line 104 of file direction_func.h.

References IsValidDirection().

Referenced by ChangeTrainDirRandomly(), DisasterTick_Submarine(), Airport::GetHangarExitDirection(), HandleCrashedAircraft(), and RotateAirportMovingData().

◆ ChangeDirDiff()

DirDiff ChangeDirDiff	(	DirDiff	d,
		DirDiff	delta
	)

inline

Applies two differences together.

This function adds two differences together and returns the resulting difference. So adding two DIRDIFF_REVERSE together results in the DIRDIFF_SAME difference.

Parameters

d	The first difference
delta	The second difference to add on

Returns: The resulting difference

Definition at line 88 of file direction_func.h.

◆ DiagDirDifference()

DiagDirDiff DiagDirDifference	(	DiagDirection	d0,
		DiagDirection	d1
	)

inline

Calculate the difference between two DiagDirection values.

Parameters

d0	The first direction as the base
d1	The second direction as the offset from the base

Returns: The difference how the second direction drifts of the first one.

Definition at line 131 of file direction_func.h.

References IsValidDiagDirection().

Referenced by AircraftGetEntryPoint().

◆ DiagDirToAxis()

Axis DiagDirToAxis ( DiagDirection d )

inline

Convert a DiagDirection to the axis.

This function returns the axis which belongs to the given DiagDirection. The axis X belongs to the DiagDirection north-east and south-west.

Parameters

d	The DiagDirection

Returns: The axis which belongs to the direction

Definition at line 214 of file direction_func.h.

References IsValidDiagDirection().

Referenced by CanRoadContinueIntoNextTile(), GetAnyRoadBits(), GetBridgeHeight(), IsRoadAllowedHere(), MaskWireBits(), SetRailStationPlatformReservation(), SetupFarmFieldFence(), CYapfCostBase::stSlopeCost(), TrainApproachingCrossingTile(), and GroundVehicle< T, Type >::UpdateZPosition().

◆ DiagDirToDir()

Direction DiagDirToDir ( DiagDirection dir )

inline

Convert a DiagDirection to a Direction.

This function can be used to convert the 4-way DiagDirection to the 8-way Direction. As 4-way are less than 8-way not all possible directions can be calculated.

Parameters

dir	The direction to convert

Returns: The resulting Direction

Definition at line 182 of file direction_func.h.

References IsValidDiagDirection().

Referenced by CmdBuildRailWagon(), CmdBuildRoadVehicle(), and TrainCanLeaveTile().

◆ DirDifference()

DirDiff DirDifference	(	Direction	d0,
		Direction	d1
	)

inline

Calculate the difference between two directions.

Parameters

d0	The first direction as the base
d1	The second direction as the offset from the base

Returns: The difference how the second direction drifts of the first one.

Definition at line 68 of file direction_func.h.

References IsValidDirection().

Referenced by Airport::GetHangarExitDirection().

◆ DirToDiagDir()

DiagDirection DirToDiagDir ( Direction dir )

inline

Convert a Direction to a DiagDirection.

This function can be used to convert the 8-way Direction to the 4-way DiagDirection. If the direction cannot be mapped its "rounded clockwise". So DIR_N becomes DIAGDIR_NE.

Parameters

dir	The direction to convert

Returns: The resulting DiagDirection, maybe "rounded clockwise".

Definition at line 166 of file direction_func.h.

References IsValidDirection().

Referenced by AircraftGetEntryPoint(), DisasterTick_Submarine(), RoadStop::Enter(), FindVehiclesInRoadStop(), GetTrainStopLocation(), RoadVehicle::GetVehicleTrackdir(), Ship::GetVehicleTrackdir(), Train::GetVehicleTrackdir(), RoadStop::Leave(), ShipTestUpDownOnLock(), GroundVehicle< T, Type >::UpdateZPosition(), and VehicleExitDir().

◆ IsDiagonalDirection()

bool IsDiagonalDirection ( Direction dir )

inline

Checks if a given Direction is diagonal.

Parameters

dir	The given direction.

Returns: True if the direction is diagonal.

Definition at line 273 of file direction_func.h.

References IsValidDirection().

Referenced by RoadVehicle::UpdateDeltaXY().

◆ IsValidAxis()

bool IsValidAxis ( Axis d )

inline

Checks if an integer value is a valid Axis.

Parameters

d	The value to check

Returns: True if the value belongs to an Axis, else false

Definition at line 43 of file direction_func.h.

References AXIS_END.

Referenced by AxisToDiagDir(), AxisToDirection(), AxisToRoadBits(), AxisToTrack(), CmdBuildLongRoad(), CmdBuildShipDepot(), CmdRemoveLongRoad(), OtherAxis(), PlaceRail_Waypoint(), PlaceRoad_Waypoint(), TileOffsByAxis(), and XYNSToDiagDir().

◆ IsValidDiagDirection()

bool IsValidDiagDirection ( DiagDirection d )

inline

Checks if an integer value is a valid DiagDirection.

Parameters

d	The value to check

Returns: True if the value belongs to a DiagDirection, else false

Definition at line 21 of file direction_func.h.

References DIAGDIR_END.

Referenced by ChangeDiagDir(), CmdBuildRoadDepot(), CmdBuildTrainDepot(), DiagDirDifference(), DiagdirReachesTrackdirs(), DiagDirToAxis(), DiagDirToDiagTrack(), DiagDirToDiagTrackBits(), DiagDirToDiagTrackdir(), DiagDirToDir(), DiagDirToRoadBits(), GetOtherAqueductEnd(), ReverseDiagDir(), ShipTestUpDownOnLock(), TileIndexDiffCByDiagDir(), TileOffsByDiagDir(), TrackEnterdirToTrackdir(), TrackExitdirToTrackdir(), and TrainController().

◆ IsValidDirection()

bool IsValidDirection ( Direction d )

inline

Checks if an integer value is a valid Direction.

Parameters

d	The value to check

Returns: True if the value belongs to a Direction, else false

Definition at line 32 of file direction_func.h.

References DIR_END.

Referenced by ChangeDir(), DirDifference(), DirToDiagDir(), IsDiagonalDirection(), ReverseDir(), TileIndexDiffCByDir(), TileOffsByDir(), and TrackDirectionToTrackdir().

◆ OtherAxis()

Axis OtherAxis ( Axis a )

inline

Select the other axis as provided.

This is basically the not-operator for the axis.

Parameters

a	The given axis

Returns: The other axis

Definition at line 197 of file direction_func.h.

References IsValidAxis().

Referenced by GetCrossingRailAxis(), and SetupFarmFieldFence().

◆ ReverseDiagDir()

DiagDirection ReverseDiagDir ( DiagDirection d )

inline

Returns the reverse direction of the given DiagDirection.

Parameters

d	The DiagDirection to get the reverse from

Returns: The reverse direction

Definition at line 118 of file direction_func.h.

References IsValidDiagDirection().

Referenced by AutoslopeCheckForAxis(), CalculateRoadStopCost(), CFollowTrackT< Ttr_type_, VehicleType, T90deg_turns_allowed_, Tmask_reserved_tracks >::CanEnterNewTile(), CanFollowRoad(), CanRoadContinueIntoNextTile(), CYapfFollowShipT< Types >::CheckShipReverse(), CheckTownBuild2House(), CheckTownBuild2x2House(), ClearPathReservation(), CmdBuildLongRoad(), FixOwnerOfRailTrack(), CFollowTrackT< Ttr_type_, VehicleType, T90deg_turns_allowed_, Tmask_reserved_tracks >::FollowTileExit(), CFollowTrackT< Ttr_type_, VehicleType, T90deg_turns_allowed_, Tmask_reserved_tracks >::ForcedReverse(), GetAnyRoadBits(), GetBridgeEnd(), GetNorthernBridgeEnd(), GetOtherAqueductEnd(), GetOtherTunnelEnd(), GrowTownWithBridge(), GrowTownWithTunnel(), IsNeighborRoadTile(), MarkDirtyAdjacentLevelCrossingTiles(), MaskWireBits(), CYapfCostRoadT< Types >::PfCalcCost(), RedundantBridgeExistsNearby(), RiverMakeWider(), SetupFarmFieldFence(), TestTownOwnsBridge(), TrainApproachingCrossing(), TrainCanLeaveTile(), TrainController(), CFollowTrackT< Ttr_type_, VehicleType, T90deg_turns_allowed_, Tmask_reserved_tracks >::TryReverse(), UpdateAdjacentLevelCrossingTilesOnLevelCrossingRemoval(), UpdateLevelCrossing(), and UpdateSignalsInBuffer().

◆ ReverseDir()

Direction ReverseDir ( Direction d )

inline

Return the reverse of a direction.

Parameters

d	The direction to get the reverse from

Returns: The reverse Direction

Definition at line 54 of file direction_func.h.

References IsValidDirection().

Referenced by TileLoop_Water(), and UpdateStatusAfterSwap().

◆ XYNSToDiagDir()

DiagDirection XYNSToDiagDir	(	Axis	xy,
		uint	ns
	)

inline

Convert an axis and a flag for north/south into a DiagDirection.

Parameters

xy	axis to convert
ns	north -> 0, south -> 1

Returns: the desired DiagDirection

Definition at line 261 of file direction_func.h.

References IsValidAxis().

Referenced by GetShipDepotDirection().

Functions

Detailed Description

Function Documentation

◆ AxisToDiagDir()

◆ AxisToDirection()

◆ ChangeDiagDir()

◆ ChangeDir()

◆ ChangeDirDiff()

◆ DiagDirDifference()

◆ DiagDirToAxis()

◆ DiagDirToDir()

◆ DirDifference()

◆ DirToDiagDir()

◆ IsDiagonalDirection()

◆ IsValidAxis()

◆ IsValidDiagDirection()

◆ IsValidDirection()

◆ OtherAxis()

◆ ReverseDiagDir()

◆ ReverseDir()

◆ XYNSToDiagDir()