Modding:level blueprint (0.9.9.7)

Level objects define the properties of fixed special levels. The level API, however, is a general purpose API for manipulating the level. This is used both for map generation (along with the generator API) and for changing the level on the fly. The Level variable also has some general properties that don't necessarily correspond to special levels in particular.

Prototype

Levels prototypes are only used for special levels and scripted levels, not random levels. They are declared using the Levels function with the ID as the first argument, and a prototype table as the second argument. They are stored by ID in a global table called levels.

Level Prototype
string	ID	The unique identifier used by the engine for this level. Instead of being included in the table, this must be passed as the first argument to the Levels function.
string	name	The name displayed in the HUD.
string	welcome	Optional message displayed on level entry.
integer	chance	Optional percent chance the level will appear. Defaults to 100.
Range	level	Level range where the level may appear.
string	entry	Optional mortem history message for level entry.

Flags

Level Flags
LF_NOHOMING	Causes homing phase devices to act like normal phase devices.
LF_UNIQUEITEM	Used by the level generation code to keep track of whether a unique item has dropped on the current level (in order to prevent multiple uniques from dropping on one level). This flag also causes a level feeling to occur indicating that a unique item is present.
LF_BONUS	This flag is automatically set for so-called special levels like Halls of Carnage. (It is not set for those special levels like Hellgate that replace normal levels, only by those reached from red stairs.)
LF_RESPAWN	Causes monsters to randomly respawn as when playing the game on Nightmare!
LF_NORESPAWN	Prevents the Nightmare! respawn feature.
LF_NUKED	This flag is automatically set when the level is nuked.
LF_NONUKE	Causes the thermonuclear bomb to have no effect when it is used. It is not respected by other nuke effects.
LF_ITEMSVISIBLE	Allows the player to see all items on the level (as with a Computer Map).
LF_BEINGSVISIBLE	Allows the player to see all beings on the level (as with a Tracking Map).

Engine Hooks

Level Hooks
void	Create()
void	OnTick()
void	OnEnter()
void	OnExit()
void	OnKill()
void	OnKillAll()
boolean	IsCompleted()

Create(): This function should create the layout of the level. It also usually sets up the initial being and item locations. The player's initial location should be set here using Level.player.

OnTick(): This is called every 0.1s of game time. This will happen many times for each of the player's moves, so be careful about putting intense calculations here.

OnEnter(): This is triggered just after the player enters the level.

OnExit(): This is triggered when the player leaves the level.

OnKill(): This hook is triggered whenever an enemy is killed.

OnKillAll(): After OnKill has triggered, if there are no enemies left on the level, the OnKillAll will be triggered. It is possible for OnKillAll to trigger again later if more enemies are spawned. By default, the "relatively safe" message is displayed.

IsCompleted() → boolean: The game calls this hook to determine if the game statistics should count the level as completed. This is only called for special levels, not scripted levels. By default, all enemies must be dead for the level to be complete.

Properties

These are properties of the global Level variable. They are changed by the engine as the player moves from level to level. For some of the read-only properties, rawset can be used to create a lua property that shadows the pascal property, tricking APIs that are implemented in lua. This is particularly useful for tricking the generator API into using a custom style.

Level
Word	status	This is for use by level designers. It is preferred to access it through Level.result.
string	name	This is the level name as displayed on the HUD.
Byte	name_number	This controls the "LevX" part of the level name. If zero, it won't be displayed.
Byte	danger_level	Level generation parameter that corresponds to depth.
Byte	style	The style (tile set) used by the level generation functions. This property is read-only.
string	special_exit	The sid of the level that red stairs lead to on the current level number. This property is read-only.
string	special_name	The sid of the current level prototype or the empty string for random levels. This property is read-only.
DWord	item_array_size	Length of the sparse array that stores all the items on the level. This property is read-only.
DWord	being_array_size	Length of the sparse array that stores all the beings on the level. This property is read-only.

API

Level Interface
value	Level.property_get(string property)
void	Level.property_set(property value, ) → string
boolean	Level.flag_get(Level Flag flag)
void	Level.flag_set(Level Flag flag, boolean value)
value	Level.roll_weight(list list, integer sum)
integer	Level.weight_list_sum(list list)
void	Level.place_tile(table translation, string tile, integer x, integer y)
void	Level.player(integer x, integer y)
integer	Level.result(integer value)
boolean	Level.eye_contact(Coord c1, Coord c2)
boolean	Level.is_visible(Coord position)
void	Level.nuke()
void	Level.explosion(Coord position, integer radius, integer delay, integer damage_dice, integer damage_sides, Color color, Sound ID sound, DamageType damagetype, ExplosionFlag List flags, Cell ID content)
	Cell-specific functions
boolean	Level.light_flag_get(Coord position, LightFlag flag)
void	Level.light_flag_set(Coord position, LightFlag flag, boolean value)
integer	Level.hp_get(Coord position)
void	Level.hp_set(Coord position, integer value)
boolean	Level.is_corpse(Coord position)
boolean	Level.scan(Area scan_area, Cell ID good)
void	Level.fill(Cell ID cell, Area fill_area)
void	Level.flood(Cell ID tile, Area flood_area)
void	Level.scatter(Area scatter_area, Cell ID good, Cell ID fill, integer count)
void	Level.scatter_put(Area scatter_area, table translation, string tile, Cell ID good, integer count)
boolean	Level.push_cell(Coord c, Coord target, boolean quiet)
	Being-specific functions
Being	Level.get_being(integer index)
Being	Level.get_being_by_uid(integer uid)
Being	Level.drop_being(Being ID bid, Coord position)
void	Level.drop_being_ext(table being, Coord position)
Being	Level.summon(Being ID bid, integer count)
Being	Level.area_summon(Area where, Being ID bid, integer count)
void	Level.clear_being(Coord position)
list, integer	Level.get_being_list()
Being ID	Level.random_being()
void	Level.flood_monster(Being ID bid, integer amount)
void	Level.flood_monsters(integer amount)
Being iterator	Level.beings()
Being iterator	Level.beings_in_range(Coord position, integer range)
	Item-specific functions
Item	Level.get_item(integer index)
Item	Level.get_item_by_uid(integer uid)
Item	Level.drop_item(Item ID iid, Coord position)
void	Level.drop_item_ext(table item, Coord position)
Item	Level.drop(Item ID iid, integer count)
Item	Level.area_drop(Area where, Item ID iid, integer count)
void	Level.try_destroy_item(Coord c)
list, integer	Level.get_item_list(integer max_level, integer unique_mult)
Item ID	Level.roll_item_type(ItemType list itypes, integer max_level, integer unique_mod)
Item ID	Level.roll_item(integer max_level, integer unique_mod)
void	Level.flood_items(integer amount)
Item iterator	Level.items()
Item iterator	Level.items_in_range(Coord position, integer range)

Level.property_get(string property) → value: Gets the value of the given level property. It is preferred to use the Lua dot indexing syntax instead.

Level.property_set(property value, ) → string: Sets the given level property to the given value. It is preferred to use the Lua dot indexing syntax instead.

Level.flag_get(Level Flag flag) → boolean
Level.flags[Level Flag flag] → boolean: Determines the current state of the given level flag.

Level.flag_set(Level Flag flag, boolean value)
Level.flags[Level Flag flag] = boolean value: Sets the given level flag to the given value.

Level.roll_weight(list list, integer sum) → value: Randomly chooses an item from the list according to the weight property of the list items. Sum must be the sum of the weights of all the list items.

Level.weight_list_sum(list list) → integer: Returns the sum of the weight properties of all the items in the list.

Level.place_tile(table translation, string tile, integer x, integer y): Places the map tile given by translation and tile on the map at the position given by x and y. translation should be a table that maps single character strings to either cell ids, or to tables. These tables have their first array element be a cell id, but they may also contain a being andor item key that is mapped to a being or item id respectively. Level.drop_being_ext and Level.drop_item_ext syntax is allowed. tile should be a string of characters that are defined in translation. Line breaks correspond to line breaks on the map.

Level.player(integer x, integer y): Sets the initial position of the player for a special or scripted level. This should be called in the Create hook; after that it has no meaningful effect.

Level.result(integer value) → integer: If value is given, updates the level's status and returns nil. If value is omitted, returns the current status.

Level.eye_contact(Coord c1, Coord c2) → boolean: Determines whether or not there is a line-of-sight path between c1 and c2. This calculation ignores light flags (such that two beings can have eye contact even if they aren't visible to each other).

Level.is_visible(Coord position) → boolean: Determines if the given position is visible to the player.

Level.nuke(): Triggers an immediate nuclear explosion as from a thermonuclear bomb.

Level.explosion(Coord position, integer radius, integer delay, integer damage_dice, integer damage_sides, Color color, Sound ID sound, DamageType damagetype, ExplosionFlag List flags, Cell ID content): Creates an explosion centered at the given position with the given parameters. radius is the size of the explosion. delay is the delay in milliseconds between animation frames (typically this is around 40). damage_dice and damage_sides determine the damage roll for the explosion. For a no-damage explosion, both should be 0. The default damage type is fire. content determines the cell that is randomly created wherever the explosion does enough damage. By default, there are no flags and there is no content. Only some colors are supported, and these are automatically translated into 3 color combinations used by the explosion animation. The supported colors are LIGHTBLUE, BLUE, MAGENTA, GREEN, LIGHTRED, YELLOW, and the default RED.

Level.light_flag_get(Coord position, LightFlag flag) → boolean
Level.light[Coord position][LightFlag flag] → boolean: Gets the value of the given light flag at the given position.

Level.light_flag_set(Coord position, LightFlag flag, boolean value)
Level.light[Coord position][LightFlag flag] = boolean value
Level.light[LightFlag flag] = boolean value: Sets the value of the given light flag at the given position. For the syntax without a position, the light flag will be set at every position on the map.

Level.hp_get(Coord position) → integer
Level.hp[Coord position] → integer: Gets the current hp of the cell at the given position.

Level.hp_set(Coord position, integer value)
Level.hp[Coord position] = integer value: Sets the current hp of the cell at the given position. Setting hp to 0 won't destroy a cell.

Level.is_corpse(Coord position) → boolean: Determines whether the given position has a corpse in it. This counts the cell with id "corpse" as a corpse even though it otherwise isn't a corpse as far as the engine is concerned.

Level.scan(Area scan_area, Cell ID good) → boolean: Determines if every cell in scan_area is good.

Level.fill(Cell ID cell, Area fill_area): Sets every cell in the given area to the area. fill_area is optional; it defaults to the full map.

Level.flood(Cell ID tile, Area flood_area): Changes CELLSET_FLOORS and CF_LIQUID tiles in the area to tile. If tile has CF_HAZARD, then it will destroy items.

Level.scatter(Area scatter_area, Cell ID good, Cell ID fill, integer count): Chooses count random tiles in scatter_area (possibly with duplicates) and sets any chosen cells that are good to fill.

Level.scatter_put(Area scatter_area, table translation, string tile, Cell ID good, integer count): Chooses count random subareas with upper-left corner in scatter_area of the size appropriate of tile (using the first line length and number of lines to define a rectangular area). There may be duplicates or overlaps. For each subarea, if the area is already filled with good, then it is replaced with tile (according to translation). See Level.place_tile for the semantics of translation and tile.

Level.push_cell(Coord c, Coord target, boolean quiet) → boolean: Swaps the content of the cells located in c and target: this will only occur successfully if target is a part of CELLSET_FLOORS. If target has the CF_HAZARD flag, the cell on c activates its OnDestroy hook. quiet, when set to true, includes messages (mostly specific to barrels, the only object pushed in the base game).

Level.get_being(integer index) → Being: Returns the being at the given index in the sparse being array. A being's index won't change as long as it is in the array.

Level.get_being_by_uid(integer uid) → Being: Returns the being with the given uid, or nil if that being doesn't exist or has been removed from the map.

Level.drop_being(Being ID bid, Coord position) → Being: Drops a newly created being in the given position. bid can also be an actual being object, although this should not be used for beings that are already on the map. If the position is occupied, the being will be dropped nearby. The dropped being is returned. If the function fails, nil is returned.

Level.drop_being_ext(table being, Coord position): As Level.drop_being, except additional values are accetable for being as Level.drop_item_ext.

Level.summon(Being ID bid, integer count) → Being: Creates new beings of the type given by bid and amount given by count and scatters them around the map. The last dropped being (if any) is returned. count is optional and defaults to 1.

Level.area_summon(Area where, Being ID bid, integer count) → Being: As Level.summon, but all the summoned beings are randomly placed in where rather than scattered across the whole map.

Level.clear_being(Coord position)

Level.clear_being(integer index): Removes an item from the map at the given position, or from the given index in the item array.

Level.get_being_list() → list,integer: Returns the list and sum (ready to be used with Level.roll_weight) for beings and beings groups according to Level.danger_level and DIFFICULTY. The result is cached.

Level.random_being() → Being ID: Returns a random being chosen according to weights from the current level's list. This will never choose a group. The returned id is always a string id.

Level.flood_monster(Being ID bid, integer amount): Add the given monster type to the level in an amount specified by the total danger value amount (so it scales appropriately with Level.flood_monsters).

Level.flood_monsters(integer amount): Adds monsters to the level using the normal algorithm for random levels. The amount is a total danger value such as a value returned by Generator.being_weight.

Level.beings() → Being iterator: Gives an iterator over all beings in the level.

Level.beings_in_range(Coord position, integer range) → Being iterator: Gives an iterator over all beings within range units of distance from position in the level.

Level.get_item(integer index) → Item: Returns the item at the given index in the sparse item array. An item's index won't change as long as it is in the array.

Level.get_item_by_uid(integer uid) → Item: Returns the item with the given uid, or nil if that item doesn't exist or has been removed from the map.

Level.drop_item(Item ID iid, Coord position) → Item: Drops a newly created item in the given position. iid can also be an actual item object, although this should not be used for items that are already on the map. If the position is occupied, the item will be dropped nearby. The dropped item is returned. If the function fails, nil is returned.

Level.drop_item_ext(table item, Coord position): As Level.drop_item, except additional values are acceptable for item. If item is a table, the first list element is passed used to determine which item to drop. For other key-value pairs in the table, the property of the dropped item that corresponds to the key will be set to the value.

Level.drop(Item ID iid, integer count) → Item: Creates new items of the type given by iid and amount given by count and scatters them around the map. The last dropped item (if any) is returned. count is optional and defaults to 1.

Level.area_drop(Area where, Item ID iid, integer count) → Item: As Level.drop, but all dropped items are randomly placed in where rather than scattered across the whole map.

Level.try_destroy_item(Coord c): Destroys an item at position, if there is one to be found.

Level.get_item_list(integer max_level, integer unique_mult) → list,integer: Returns the list and sum (ready to be used with Level.roll_weight) for items according to max_level, and unique_mult. max_level defaults to Level.danger_level, and is used to determine which items fall in the proper level range. Unique items' weights are multiplied by unique_mult (which defaults to 1). The result is cached.

Level.roll_item_type(ItemType list itypes, integer max_level, integer unique_mod) → Item ID: Returns a random item chosen from among the given item types according to weights from the list specified by max_level and unique_mod. The returned id is always a string id.

Level.roll_item(integer max_level, integer unique_mod) → Item ID: As Level.roll_item_type, but the item type of the result isn't restricted.

Level.flood_items(integer amount): Adds items to the level according to the normal algorithm for random levels (not counting special features). The number of items is given by amount.

Level.items() → Item iterator: Gives an iterator over all items in the level.

Level.items_in_range(Coord position, integer range) → Item iterator: Gives an iterator over all items within range units of distance from position in the level.

Modding:level blueprint (0.9.9.7)

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