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# Jecs | ||
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Jecs. Just an Entity Component System. | ||
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## Properties | ||
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### World | ||
```luau | ||
jecs.World: World | ||
``` | ||
A world is a container of all ECS data. Games can have multiple worlds but component IDs may conflict between worlds. Ensure to register the same component IDs in the same order for each world. | ||
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### Wildcard | ||
```luau | ||
jecs.Wildcard: Entity | ||
``` | ||
Builtin component type. This ID is used for wildcard queries. | ||
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### Component | ||
```luau | ||
jecs.Component: Entity | ||
``` | ||
Builtin component type. Every ID created with [world:component()](world.md#component()) has this type added to it. This is meant for querying every component ID. | ||
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### ChildOf | ||
```luau | ||
jecs.ChildOf: Entity | ||
``` | ||
Builtin component type. This ID is for creating parent-child hierarchies. | ||
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### Rest | ||
```luau | ||
jecs.Rest: Entity | ||
``` | ||
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## Functions | ||
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### pair() | ||
```luau | ||
function jecs.pair( | ||
first: Entity, -- The first element of the pair, referred to as the relationship of the relationship pair. | ||
object: Entity, -- The second element of the pair, referred to as the target of the relationship pair. | ||
): number -- Returns the Id with those two elements | ||
``` | ||
::: info | ||
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Note that while relationship pairs can be used as components, meaning you can add data with it as an ID, however they cannot be used as entities. Meaning you cannot add components to a pair as the source of a binding. | ||
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::: | ||
# Jecs | ||
|
||
Jecs. Just an Entity Component System. | ||
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||
# Properties | ||
|
||
## World | ||
```luau | ||
jecs.World: World | ||
``` | ||
A world is a container of all ECS data. Games can have multiple worlds but component IDs may conflict between worlds. Ensure to register the same component IDs in the same order for each world. | ||
|
||
## Wildcard | ||
```luau | ||
jecs.Wildcard: Entity | ||
``` | ||
Builtin component type. This ID is used for wildcard queries. | ||
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||
## Component | ||
```luau | ||
jecs.Component: Entity | ||
``` | ||
Builtin component type. Every ID created with [world:component()](world.md#component()) has this type added to it. This is meant for querying every component ID. | ||
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## ChildOf | ||
```luau | ||
jecs.ChildOf: Entity | ||
``` | ||
Builtin component type. This ID is for creating parent-child hierarchies. | ||
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## Rest | ||
```luau | ||
jecs.Rest: Entity | ||
``` | ||
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# Functions | ||
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## pair() | ||
```luau | ||
function jecs.pair( | ||
first: Entity, -- The first element of the pair, referred to as the relationship of the relationship pair. | ||
object: Entity, -- The second element of the pair, referred to as the target of the relationship pair. | ||
): number -- Returns the Id with those two elements | ||
``` | ||
::: info | ||
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||
Note that while relationship pairs can be used as components, meaning you can add data with it as an ID, however they cannot be used as entities. Meaning you cannot add components to a pair as the source of a binding. | ||
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::: |
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# Query | ||
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A World contains entities which have components. The World is queryable and can be used to get entities with a specific set of components. | ||
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## Functions | ||
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### drain() | ||
```luau | ||
function query:drain(): Query | ||
``` | ||
This function will impede it from being reset when the query is being iterated. | ||
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### next() | ||
```luau | ||
function query:next(): Query | ||
``` | ||
Get the next result in the query. Drain must have been called beforehand or otherwise it will error. | ||
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### with() | ||
```luau | ||
function query:with( | ||
...: Entity -- The IDs to query with | ||
): Query | ||
``` | ||
Adds IDs to query with, but will not use their data. This is useful for Tags or generally just data you do not care for. | ||
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Example: | ||
::: code-group | ||
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```luau [luau] | ||
for id, position in world:query(Position):with(Velocity) do | ||
-- Do something | ||
end | ||
``` | ||
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```ts [typescript] | ||
for (const [id, position] of world.query(Position).with(Velocity)) { | ||
// Do something | ||
} | ||
``` | ||
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::: | ||
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:::info | ||
Put the IDs inside of `world:query()` instead if you need the data. | ||
::: | ||
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### without() | ||
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```luau | ||
function query:without( | ||
...: Entity -- The IDs to filter against. | ||
): Query -- Returns the Query | ||
``` | ||
Removes entities with the provided IDs from the query. | ||
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||
Example: | ||
::: code-group | ||
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```luau [luau] | ||
for _ in world:query(Position):without(Velocity) do | ||
-- Do something | ||
end | ||
``` | ||
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||
```ts [typescript] | ||
for (const _ of world.query(Position).without(Velocity)) { | ||
// Do something | ||
} | ||
``` | ||
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::: | ||
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### replace() | ||
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```luau | ||
function query:replace( | ||
fn: (entity: Entity, ...: T...) -> U... -- ): () -- The callback that will transform the entities' data | ||
``` | ||
This function takes a callback which is given the current queried data of each matching entity. The values returned by the callback will be set as the new data for each given ID on the entity. | ||
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Example: | ||
::: code-group | ||
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```luau [luau] | ||
world:query(Position, Velocity):replace(function(e, position, velocity) | ||
return position + velocity, velocity * 0.9 | ||
end | ||
``` | ||
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```ts [typescript] | ||
world | ||
.query(Position, Velocity) | ||
.replace((e, position, velocity) => | ||
$tuple(position.add(velocity), velocity.mul(0.9)), | ||
); | ||
``` | ||
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::: | ||
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### archetypes() | ||
```luau | ||
function query.archetypes(): { Archetype } | ||
``` | ||
Returns the matching archetypes of the query. | ||
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Example: | ||
::: code-group | ||
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```luau [luau] | ||
for i, archetype in world:query(Position, Velocity).archetypes() do | ||
local columns = archetype.columns | ||
local field = archetype.records | ||
local P = field[Position] | ||
local V = field[Velocity] | ||
for row, entity in archetype.entities do | ||
local position = columns[P][row] | ||
local velocity = columns[V][row] | ||
-- Do something | ||
end | ||
end | ||
``` | ||
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::: | ||
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:::info | ||
This function is meant for internal usage. Use this if you want to maximize performance by inlining the iterator. | ||
::: | ||
# Query | ||
|
||
A World contains entities which have components. The World is queryable and can be used to get entities with a specific set of components. | ||
|
||
# Functions | ||
|
||
## drain() | ||
```luau | ||
function query:drain(): Query | ||
``` | ||
This function will impede it from being reset when the query is being iterated. | ||
|
||
## next() | ||
```luau | ||
function query:next(): Query | ||
``` | ||
Get the next result in the query. Drain must have been called beforehand or otherwise it will error. | ||
|
||
## with() | ||
```luau | ||
function query:with( | ||
...: Entity -- The IDs to query with | ||
): Query | ||
``` | ||
Adds IDs to query with, but will not use their data. This is useful for Tags or generally just data you do not care for. | ||
|
||
Example: | ||
::: code-group | ||
|
||
```luau [luau] | ||
for id, position in world:query(Position):with(Velocity) do | ||
-- Do something | ||
end | ||
``` | ||
|
||
```ts [typescript] | ||
for (const [id, position] of world.query(Position).with(Velocity)) { | ||
// Do something | ||
} | ||
``` | ||
|
||
::: | ||
|
||
:::info | ||
Put the IDs inside of `world:query()` instead if you need the data. | ||
::: | ||
|
||
## without() | ||
|
||
```luau | ||
function query:without( | ||
...: Entity -- The IDs to filter against. | ||
): Query -- Returns the Query | ||
``` | ||
Removes entities with the provided IDs from the query. | ||
|
||
Example: | ||
::: code-group | ||
|
||
```luau [luau] | ||
for _ in world:query(Position):without(Velocity) do | ||
-- Do something | ||
end | ||
``` | ||
|
||
```ts [typescript] | ||
for (const _ of world.query(Position).without(Velocity)) { | ||
// Do something | ||
} | ||
``` | ||
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||
::: | ||
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## replace() | ||
|
||
```luau | ||
function query:replace( | ||
fn: (entity: Entity, ...: T...) -> U... -- ): () -- The callback that will transform the entities' data | ||
``` | ||
This function takes a callback which is given the current queried data of each matching entity. The values returned by the callback will be set as the new data for each given ID on the entity. | ||
|
||
Example: | ||
::: code-group | ||
|
||
```luau [luau] | ||
world:query(Position, Velocity):replace(function(e, position, velocity) | ||
return position + velocity, velocity * 0.9 | ||
end | ||
``` | ||
|
||
```ts [typescript] | ||
world | ||
.query(Position, Velocity) | ||
.replace((e, position, velocity) => | ||
$tuple(position.add(velocity), velocity.mul(0.9)), | ||
); | ||
``` | ||
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::: | ||
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||
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## archetypes() | ||
```luau | ||
function query.archetypes(): { Archetype } | ||
``` | ||
Returns the matching archetypes of the query. | ||
|
||
Example: | ||
::: code-group | ||
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||
```luau [luau] | ||
for i, archetype in world:query(Position, Velocity).archetypes() do | ||
local columns = archetype.columns | ||
local field = archetype.records | ||
local P = field[Position] | ||
local V = field[Velocity] | ||
for row, entity in archetype.entities do | ||
local position = columns[P][row] | ||
local velocity = columns[V][row] | ||
-- Do something | ||
end | ||
end | ||
``` | ||
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::: | ||
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:::info | ||
This function is meant for internal usage. Use this if you want to maximize performance by inlining the iterator. | ||
::: |
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