Editing ACS built-in functions (section)

==Function list==
===Sound and music===
*[[ActivatorSound]]
*[[AmbientSound]]
*[[LocalAmbientSound]]
*[[PlayActorSound]]
*[[PlaySound]]
*[[SectorSound]]
*[[SetMusic]]
*[[LocalSetMusic]]
*[[SoundSequence]]
*[[SoundSequenceOnActor]]
*[[StopSound]]
*[[ThingSound]]

===Sectors===
{|class="wikitable sortable
! Name
! Description
|-
||[[ChangeCeiling]]||Changes the ceiling texture.
|-
||[[ChangeFloor]]||Changes the floor texture.
|-
||[[GetSectorCeilingZ]]||Gets the ceiling height.
|-
||[[GetSectorFloorZ]]||Gets the floor height.
|-
||[[GetSectorLightLevel]]||Gets the light level.
|-
||[[SectorDamage]]||Damages things in sector.
|-
||[[SetSectorDamage]]||Modifies the damaging floor status.
|-
||[[TagWait]]||Waits for sectors to stop movement.
|}

===Things===
*[[ActivatorTID]]
*[[ChangeActorAngle]]
*[[ChangeActorPitch]]
*[[CheckActorCeilingTexture]]
*[[CheckActorClass]]
*[[CheckActorFloorTexture]]
*[[CheckActorProperty]]
*bool [[CheckFlag]](int tid, str flag)
:Returns true if the first thing with the given tid has the given flag enabled.
*[[CheckProximity]]
*bool CheckSight(int source, int dest, int flags)
:Returns true if there's a line of sight between at least one thing tagged as source and one thing tagged as dest. Currently flags is reserved and must be 0.
*int [[ClassifyActor]](int tid)
:Checks the kind of thing tagged tid. It returns a set of flags, possibly combined:
:*ACTOR_PLAYER (2): it's player-controlled
:*ACTOR_VOODOODOLL (8): it's a duplicate player start, not controlled by the player but still linked to it. Used in Boom maps for advanced mapping tricks
:*ACTOR_MONSTER (16): it's a monster (has COUNTKILL or KILLABLE thing type flag set)
:*ACTOR_MISSILE (128): it's a projectile in flight (has MISSILE thing type flag set)
:*ACTOR_GENERIC (256): neither a monster, nor a projectile
:*ACTOR_ALIVE (32): has positive health
:*ACTOR_DEAD (64): has health <= 0
:*ACTOR_NONE (0): no thing found with this TID
:*ACTOR_WORLD (1): TID is 0 but activator isn't a thing
*[[GetActorAngle]]
*[[GetActorCeilingZ]]
*[[GetActorFloorZ]]
*[[GetActorLightLevel]]
*[[GetActorPitch]]
*[[GetActorProperty]]
*[[GetActorVelX]]
*[[GetActorVelY]]
*[[GetActorVelZ]]
*[[GetActorX]]
*[[GetActorY]]
*[[GetActorZ]]
*[[IsTIDUsed]]
*[[SetActivator]]
*[[SetActivatorToTarget]]
*void SetActorAngle (int tid, fixed angle)
*[[SetActorVelocity]]
*void SetActorPitch (int tid, int pitch)
*[[SetActorPosition]]
*void SetThingSpecial (int tid, int special [, int arg0 [, int arg1 [, int arg2 [, int arg3 [, int arg4]]]]])
*int SetActorState(int tid, str statename[, bool exact]);
*[[SetActorProperty]]
*int Spawn (str classname, fixed x, fixed y, fixed z [, int tid [, int angle]])
*int SpawnForced (str classname, fixed x, fixed y, fixed z [, int tid [, int angle]])
*[[SpawnProjectile]]
*[[SpawnSpot]]
*int SpawnSpotFacing (str classname, int spottid [, int tid])
*[[SpawnSpotFacingForced]]
*[[SpawnSpotForced]]
*int ThingCount (int type, int tid)
*int ThingCountName (str classname, int tid)
*int ThingCountSector (int type, int tid, int tag)
*int ThingCountNameSector (str classname, int tid, int tag)
*int Thing_Damage2 (int tid, int amount, str type);
*void Thing_Projectile2 (int tid, int type, int angle, int speed, int vspeed, int gravity, int newtid)
*int UniqueTID ([int tid[, int limit]])

===Player===
*[[CheckInventory]]
*[[CheckWeapon]]
*[[GetWeapon]]
*[[GetSigilPieces]]
*[[PlayerArmorPoints]]
*[[PlayerCount]]
*[[PlayerFrags]]
*[[PlayerHealth]]
*[[PlayerNumber]]
*[[SetWeapon]]
*[[TakeInventory]]

===Linedefs and sidedefs===
{|class="wikitable sortable"
! zspecial.acs index
! Name
! Return type
! Parameters
! Description
|-
||internal|| [[ClearLineSpecial]] || nothing || nothing || Clears the trigger linedef's special.
|-
|| || [[GetLineRowOffset]] || || ||
|-
|| || [[GetLineX]] || || ||
|-
|| || [[GetLineY]] || || ||
|-
|| || [[LineSide]] || || ||
|-
|| || [[ReplaceTextures]] || nothing || str old_texture_name, str new_texture_name[, int flags] ||
|-
|| || [[SetLineBlocking]] || || ||
|-
||internal|| [[SetLineMonsterBlocking]] || || || Makes a linedef block or not block monsters.
|-
|| || [[SetLineSpecial]] || || ||
|-
|| || [[SetLineTexture]] || nothing || int line_id, int line_side, int sidedef_texture, str texture_name ||
|}

===Sky===
*[[SetSkyScrollSpeed]]

===Scripts===
*bool ACS_NamedExecuteAlways(str script, int map, int arg1, int arg2, int arg3)
:*Executes a named script, starting a new instance if one already exists. Returns true if successfully started.
*bool ACS_NamedExecute(str script, int map, int arg1, int arg2, int arg3)
:*Executes a named script. Returns true if successfully started.
*int ACS_NamedExecuteWithResult (string script, int s_arg1, int s_arg2, int s_arg3, int s_arg4)
*bool ACS_NamedSuspend (string script, int map)
*bool ACS_NamedTerminate (string script, int map)

===Console===
*int [[GetCVar]] (str cvar)
*string [[GetCVarString]] (str cvar)
*int GetPlayerInput (int player, int input)

===Polyobjects===
*[[GetPolyobjX]]
*[[GetPolyobjY]]
*[[PolyWait]]

===Quake===
*[[Radius_Quake2]]

===Math===
*[[Cos]]
*fixed [[FixedSqrt]] (fixed number)
*int [[Random]] (int min, int max)
*int [[Sqrt]] (int number)
*[[Sin]]
*[[VectorAngle]]
*int [[VectorLength]] (int x, int y)

===Strings===
*str StrLeft (str string, int length)
*str StrMid (str string, int start, int length)
*str StrRight (str string, int length)

===Level state===
*[[GameSkill]]
*[[GameType]]
*[[GetLevelInfo]]
*[[SetAirControl]]
*[[SetAirFriction]]
*[[SetGravity]]
*[[SinglePlayer]]
*[[Timer]]