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#Entity
#Entity::get_children
Retrieves all child entities attached to the specified parent entity.
Parameters:
- parent : The parent entity whose children to retrieve.
Returns an array of child entities. Returns an empty array if the entity has
no children.
Example:
let parent = @entity.Entity()
let child1 = parent.spawn_child()
let child2 = parent.spawn_child()
let children = parent.get_children()
inspect(children.length(), content="2")
inspect(child1 == children[0], content="true")
inspect(child2 == children[1], content="true")
parent.destroy()#Entity::get_parent
Retrieves the parent entity of a child entity.
Parameters:
- child : The child entity whose parent to retrieve.
Returns Some(parent_entity) if the entity has a parent, or None if the
entity is not a child.
Example:
let parent = @entity.Entity()
let child = parent.spawn_child()
inspect(child.get_parent().unwrap() == parent, content="true")
inspect(parent.get_parent(), content="None")
parent.destroy()#Entity::is_child
Checks whether an entity is a child of another entity.
Parameters:
- entity : The entity to check.
Returns true if the entity is a child (has a parent), false otherwise.
Example:
let parent = @entity.Entity()
let child = parent.spawn_child()
let standalone = @entity.Entity()
inspect(child.is_child(), content="true")
inspect(standalone.is_child(), content="false")
parent.destroy()
standalone.destroy()#Entity::reserve_spawn
Reserves an entity id that becomes alive on the next flush.
This matches deferred-spawn semantics used by commands.
#Entity::spawn_child
Creates a new child entity attached to the specified parent entity.
The child entity is automatically registered in the entity system and linked
to its parent. The parent-child relationship enables hierarchical transforms
and cascading lifecycle operations (destroying a parent destroys all its
children, and respawning a parent respawns all its children).
Parameters:
- parent : The parent entity to attach the new child to. Returns a new child Entity that is linked to the parent.
Example:
let parent = @entity.Entity()
@transform.transforms().set(parent, @transform.Transform::from_xyz(100.0, 100.0, 0.0))
let child = parent.spawn_child()
@transform.transforms().set(child, @transform.Transform::from_xyz(10.0, 5.0, 0.0))
inspect(parent.get_children().length(), content="1")
inspect(child.is_child(), content="true")
parent.destroy()#get_roots
Returns an iterator over all root entities in the hierarchy.
Root entities are parent entities (entities that have spawned children) that
are not themselves children of another entity. They serve as the starting
points for hierarchical transform propagation in the
@transform.transform_propagate_system.
Important: Only entities that have called spawn_child() at least once
can be root entities. Standalone entities created with Entity() that
have never spawned children are not considered roots and will not be returned
by this function.
Returns an Iter[Entity] that yields all root parent entities.
Example:
@entity.entity_flush_system(0.0)
let root1 = @entity.Entity()
let root2 = @entity.Entity()
let child1 = root1.spawn_child()
let _grandchild = child1.spawn_child()
// root1 and root2 are roots (parents but not children)
// child1 is not a root (it's both a parent and a child)
let roots = @entity.get_roots().collect()
inspect(roots.length(), content="1")
root1.destroy()
root2.destroy()
ECS game engine in MoonBit
Game Engine
0.37.1
Apache-2.0
Updated 20 days ago
3K downloadsDependencies
- Milky2018/moon_rapier0.5.1
- Milky2018/moon_accesskit0.3.0
- Milky2018/xml0.2.0
- gmlewis/base640.16.10
- moonbitlang/x0.4.45
- gmlewis/gzip0.34.9
- Milky2018/zstd0.1.1
- gmlewis/io0.23.12
- gmlewis/flate0.36.9
- Milky2018/chicle0.6.0