Struct bevy_transform::helper::TransformHelper

pub struct TransformHelper<'w, 's> { /* private fields */ }

System parameter for computing up-to-date GlobalTransforms.

Computing an entity’s GlobalTransform can be expensive so it is recommended you use the GlobalTransform component stored on the entity, unless you need a GlobalTransform that reflects the changes made to any Transforms since the last time the transform propagation systems ran.

Implementations

impl<'w, 's> TransformHelper<'w, 's>

pub fn compute_global_transform( &self, entity: Entity ) -> Result<GlobalTransform, ComputeGlobalTransformError>

Computes the GlobalTransform of the given entity from the Transform component on it and its ancestors.

Trait Implementations

impl SystemParam for TransformHelper<'_, '_>

type State = FetchState

Used to store data which persists across invocations of a system.

type Item<'w, 's> = TransformHelper<'w, 's>

The item type returned when constructing this system param. The value of this associated type should be Self, instantiated with new lifetimes.

fn init_state(world: &mut World, system_meta: &mut SystemMeta) -> Self::State

Registers any World access used by this SystemParam and creates a new instance of this param’s State.

unsafe fn new_archetype( state: &mut Self::State, archetype: &Archetype, system_meta: &mut SystemMeta )

For the specified Archetype, registers the components accessed by this SystemParam (if applicable).a

fn apply(state: &mut Self::State, system_meta: &SystemMeta, world: &mut World)

Applies any deferred mutations stored in this SystemParam’s state. This is used to apply Commands during apply_deferred.

fn queue( state: &mut Self::State, system_meta: &SystemMeta, world: DeferredWorld<'_> )

Queues any deferred mutations to be applied at the next apply_deferred.

unsafe fn get_param<'w, 's>( state: &'s mut Self::State, system_meta: &SystemMeta, world: UnsafeWorldCell<'w>, change_tick: Tick ) -> Self::Item<'w, 's>

Creates a parameter to be passed into a SystemParamFunction.

impl<'w, 's> ReadOnlySystemParam for TransformHelper<'w, 's>

where Query<'w, 's, &'static Parent>: ReadOnlySystemParam, Query<'w, 's, &'static Transform>: ReadOnlySystemParam,