Lua API

• Index

Contents

• Event types
• Functions
• Class Script
• Event functions

Modules

• Array
• Builder
• City
• DSA
• Debug
• Draft
• Drawing
• GUI
• Runtime
• Script
• TheoTown
• Tile
• Util
• Vector

Topics

• Introduction
• Lua

Module Script

The unit scripts are organized in.

Scripting is organized in single scripts that can be attached to draft objects. At runtime the script's methods get called at certain points in time and therefore allow the script to run.

Usage:

local x = 0

function script:init()
  Debug.toast('init')
end

function script:update()
  Debug.info(x)
  x = x + 1
end

Event types

EVENT_CAR_DESPAWNED	Will be called for building with car spawner whenever a car was despawned.
EVENT_CAR_REACHED	Will be called for building with car spawner whenever a car reached it's target.
EVENT_CAR_SPAWNED	Will be called for building with car spawner whenever a car was spawned.
EVENT_FINISHED	Will be called for building and road drafts right after construction.
EVENT_PLACED	Will be called for building and road drafts right after placement.
EVENT_REMOVE	Will be called for scripts attached to a building before it gets removed.
EVENT_TOOL_ENTER	Will be called for scripts attached to a generic tool when users selects the tool.
EVENT_UPGRADE	Will be called for scripts attached to a building after an upgarde of it was finished.

Functions

getScript ()	Returns the current script or nil if no script is running right now.
getScripts ([tag])	Returns an array of all scripts, or, if tag is specified, an array of all scripts that defined the given tag.

Class Script

Script:addScript (name, draft[, initializer])	Adds a script to a draft.
Script:addTag (tag)	Adds a tag to this script.
Script:getDraft ()	Returns the draft the script is attached to.
Script:getId ()	Every script is uniquely identified by a single number.
Script:getLocation ()	Returns a readable location identifier that contains the draft id.
Script:getName ()	Returns the name of the script.
Script:getParent ()	Returns the parent script if there is any, nil otherwise.
Script:getParents ()	Returns an array of all parent scripts.
Script:getPath ()	Returns the relative path of the script.
Script:getTags ()	Returns an array that contains the tags that have been defined for that script.
Script:isActive ()	Determines whether the script is active right now.
Script:setActive (state)	Activates or disables the script.

Event functions

script:click (x, y, level)	Will be called when users taps on a building/road of this draft while being in default tool.
script:daily (x, y, level)	Will be called on a daily basis for every building or road that are instances of the owning draft.
script:disable ()	Will be called when this script is about to be disabled.
script:draw (x, y, level)	Will be called after a building/road instance has been drawn.
script:earlyInit ()	Will be called on all scripts before script:init().
script:earlyTap (tileX, tileY, x, y)	Will be called when the user taps on the map.
script:enable ()	Will be called when this script is about to be enabled.
script:enterCity ()	Will be called when the user enters a city.
script:enterCityGeneration (phase)	Will be called right before a new city is generated.
script:enterStage ()	Will be called whenever the user enters a stage.
script:event (x, y, level, event)	Will be called for building/road/tool events of instances of the owning draft.
script:init ()	Will be called once after all drafts and scripts have been loaded.
script:isBuildable (x, y, level)	For buildings and roads only: Will be queried to determine if a building/road can be built at a specific location.
script:lateInit ()	Will be called once after script:init() has been called on all scripts.
script:leaveCity ()	Will be called when the user leaves the city.
script:leaveCityGeneration (phase)	Will be called after city generation process was completed.
script:leaveStage ()	Will be called whenever the user leaves a stage.
script:nextDay ()	Will be called on a daily basis for each script.
script:nextMonth ()	Will be called on a monthly basis for each script.
script:nextYear ()	Will be called on a yearly basis for each script.
script:overlay ()	Will be called once per frame after UI has been drawn.
script:random (x, y)	Will be called every day for scripts whose owning draft is a building or road.
script:save ()	Will be called just before the city is saved.
script:tap (tileX, tileY, x, y)	Will be called when the user taps on the map.
script:update ()	Will be called per frame for each script while a city is open.

Event types

EVENT_CAR_DESPAWNED

Will be called for building with car spawner whenever a car was despawned.

EVENT_CAR_REACHED

Will be called for building with car spawner whenever a car reached it's target.

EVENT_CAR_SPAWNED

Will be called for building with car spawner whenever a car was spawned.

EVENT_FINISHED

Will be called for building and road drafts right after construction. That is immediately after placements for roads and for buildings witht zero buildtime.

EVENT_PLACED

Will be called for building and road drafts right after placement.

See also:

script:event

EVENT_REMOVE

Will be called for scripts attached to a building before it gets removed.

EVENT_TOOL_ENTER

Will be called for scripts attached to a generic tool when users selects the tool.

EVENT_UPGRADE

Will be called for scripts attached to a building after an upgarde of it was finished.

Functions

getScript ()

Returns the current script or nil if no script is running right now. Since scripts are executed synchronously to avoid race conditions there can only be one script running.

Returns:

script

getScripts ([tag])

Returns an array of all scripts, or, if tag is specified, an array of all scripts that defined the given tag. Don't manipulate the returned array directly.

Parameters:

• tag (optional)

Returns:

array

Class Script

Here you see the methods that a script object offers.

Script:addScript (name, draft[, initializer])

Adds a script to a draft. Only call this method in the init or lateInit methods to ensure that it will be executed correctly. However, init and/or lateInit might not be called on the new script automatically. Format of initializer: initializer(script) If no initializer is provided the own initializer will be used. Returns the newly created script.

Parameters:

• name string
• draft draft
• initializer function (optional)

Returns:

script

Script:addTag (tag)

Adds a tag to this script. Tags can be used to find scripts by using getScripts(tag).

Parameters:

• tag

Script:getDraft ()

Returns the draft the script is attached to. Every script instance is attached to exactly one draft. However, multiple instances of the same script may be attached to different drafts.

Returns:

draft

Script:getId ()

Every script is uniquely identified by a single number. Note that this identifier is only constant during runtime. It may be different in the next session, therefore you shouldn't rely on it.

Returns:

number

Script:getLocation ()

Returns a readable location identifier that contains the draft id.

Returns:

string

Script:getName ()

Returns the name of the script. E.g. the name of a script

folder/test.lua

is just test.

Returns:

string

Script:getParent ()

Returns the parent script if there is any, nil otherwise. A parent script is the script that instantiated this script using script:addScript() Scripts are usually not instantiated by other scripts.

Returns:

script

Script:getParents ()

Returns an array of all parent scripts.

Returns:

array

Script:getPath ()

Returns the relative path of the script.

Returns:

string

Script:getTags ()

Returns an array that contains the tags that have been defined for that script.

Returns:

array

Script:isActive ()

Determines whether the script is active right now.

Returns:

bool

Script:setActive (state)

Activates or disables the script. No event methods will be called on disabled scripts. A disabled script cannot re-enable itself since it won't be updated anymore.

Parameters:

• state bool

Event functions

script:click (x, y, level)

Will be called when users taps on a building/road of this draft while being in default tool. Return false to prevent opening the default tile dialog. You should favor this method over earlyTap() and tap() as they operate indepently of tile dialog and selected tool and don't take the own draft into consideration. This method will also be called for custom tools if user taps on a tile and script:isBuildable() returned true for it.

Parameters:

• x number
• y number
• level number

script:daily (x, y, level)

Will be called on a daily basis for every building or road that are instances of the owning draft. Level is 0 for buildings.

Parameters:

• x number
• y number
• level number

script:disable ()

Will be called when this script is about to be disabled.

script:draw (x, y, level)

Will be called after a building/road instance has been drawn. Will also be called on all visible tiles for custom tools.

Parameters:

• x number
• y number
• level number

script:earlyInit ()

Will be called on all scripts before script:init(). Use this method to set up early things.

script:earlyTap (tileX, tileY, x, y)

Will be called when the user taps on the map. Will be called just before the tap is handled by the current tool.

Parameters:

• tileX number
• tileY number
• x number
• y number

script:enable ()

Will be called when this script is about to be enabled. Scripts are enabled by definiton right after their creation so this method won't be called then.

script:enterCity ()

Will be called when the user enters a city.

script:enterCityGeneration (phase)

Will be called right before a new city is generated.

Parameters:

• phase number Will be 0 for first pass and 1 for decoration creation

script:enterStage ()

Will be called whenever the user enters a stage. A stage is for example a city, the settings screen or the gallery.

script:event (x, y, level, event)

Will be called for building/road/tool events of instances of the owning draft. Level is 0 for buildings.

Parameters:

• x number
• y number
• level number
• event number Event number (see listing above)

See also:

Script.EVENT_PLACED

script:init ()

Will be called once after all drafts and scripts have been loaded.

script:isBuildable (x, y, level)

For buildings and roads only: Will be queried to determine if a building/road can be built at a specific location. To prevent buildability just let it return false. Is also queried for custom tools to determine buildability.

Parameters:

• x number
• y number
• level number

script:lateInit ()

Will be called once after script:init() has been called on all scripts. Use this method for things that relay on other scripts' setup.

script:leaveCity ()

Will be called when the user leaves the city. Don't rely on this method to permanently save state since there's no guarantee that this method will be called.

script:leaveCityGeneration (phase)

Will be called after city generation process was completed.

Parameters:

• phase

script:leaveStage ()

Will be called whenever the user leaves a stage. A stage is for example a city, the settings screen or the gallery.

script:nextDay ()

Will be called on a daily basis for each script.

script:nextMonth ()

Will be called on a monthly basis for each script.

script:nextYear ()

Will be called on a yearly basis for each script.

script:overlay ()

Will be called once per frame after UI has been drawn. Will also be called outside of cities.

script:random (x, y)

Will be called every day for scripts whose owning draft is a building or road. x and y is a random (valid) postion on the map.

Parameters:

• x number
• y number

script:save ()

Will be called just before the city is saved.

script:tap (tileX, tileY, x, y)

Will be called when the user taps on the map. Will be called just after the tap is handled by the current tool.

Parameters:

• tileX number
• tileY number
• x number
• y number

script:update ()

Will be called per frame for each script while a city is open. Can be used to draw stuff on the screen (under the UI). Use overlay() do draw on top of UI and/or outside of cities.