Struct bevy::time::Fixed

pub struct Fixed { /* private fields */ }
Expand description

The fixed timestep game clock following virtual time.

A specialization of the Time structure. For method documentation, see Time<Fixed>.

It is automatically inserted as a resource by TimePlugin and updated based on Time<Virtual>. The fixed clock is automatically set as the generic Time resource during FixedUpdate schedule processing.

The fixed timestep clock advances in fixed-size increments, which is extremely useful for writing logic (like physics) that should have consistent behavior, regardless of framerate.

The default timestep() is 64 hertz, or 15625 microseconds. This value was chosen because using 60 hertz has the potential for a pathological interaction with the monitor refresh rate where the game alternates between running two fixed timesteps and zero fixed timesteps per frame (for example when running two fixed timesteps takes longer than a frame). Additionally, the value is a power of two which losslessly converts into f32 and f64.

To run a system on a fixed timestep, add it to one of the FixedMain schedules, most commonly FixedUpdate.

This schedule is run a number of times between PreUpdate and Update according to the accumulated overstep() time divided by the timestep(). This means the schedule may run 0, 1 or more times during a single update (which typically corresponds to a rendered frame).

Time<Fixed> and the generic Time resource will report a delta() equal to timestep() and always grow elapsed() by one timestep() per iteration.

The fixed timestep clock follows the Time<Virtual> clock, which means it is affected by pause(), set_relative_speed() and set_max_delta() from virtual time. If the virtual clock is paused, the FixedUpdate schedule will not run. It is guaranteed that the elapsed() time in Time<Fixed> is always between the previous elapsed() and the current elapsed() value in Time<Virtual>, so the values are compatible.

Changing the timestep size while the game is running should not normally be done, as having a regular interval is the point of this schedule, but it may be necessary for effects like “bullet-time” if the normal granularity of the fixed timestep is too big for the slowed down time. In this case, set_timestep() and be called to set a new value. The new value will be used immediately for the next run of the FixedUpdate schedule, meaning that it will affect the delta() value for the very next FixedUpdate, even if it is still during the same frame. Any overstep() present in the accumulator will be processed according to the new timestep() value.

Trait Implementations§

§

impl Clone for Fixed

§

fn clone(&self) -> Fixed

Returns a copy of the value. Read more
1.0.0 · source§

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
§

impl Debug for Fixed

§

fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>

Formats the value using the given formatter. Read more
§

impl Default for Fixed

§

fn default() -> Fixed

Returns the “default value” for a type. Read more
§

impl FromReflect for Fixed

§

fn from_reflect(reflect: &(dyn Reflect + 'static)) -> Option<Fixed>

Constructs a concrete instance of Self from a reflected value.
§

fn take_from_reflect( reflect: Box<dyn Reflect> ) -> Result<Self, Box<dyn Reflect>>

Attempts to downcast the given value to Self using, constructing the value using from_reflect if that fails. Read more
§

impl GetTypeRegistration for Fixed

§

impl Reflect for Fixed

§

fn get_represented_type_info(&self) -> Option<&'static TypeInfo>

Returns the TypeInfo of the type represented by this value. Read more
§

fn into_any(self: Box<Fixed>) -> Box<dyn Any>

Returns the value as a Box<dyn Any>.
§

fn as_any(&self) -> &(dyn Any + 'static)

Returns the value as a &dyn Any.
§

fn as_any_mut(&mut self) -> &mut (dyn Any + 'static)

Returns the value as a &mut dyn Any.
§

fn into_reflect(self: Box<Fixed>) -> Box<dyn Reflect>

Casts this type to a boxed reflected value.
§

fn as_reflect(&self) -> &(dyn Reflect + 'static)

Casts this type to a reflected value.
§

fn as_reflect_mut(&mut self) -> &mut (dyn Reflect + 'static)

Casts this type to a mutable reflected value.
§

fn clone_value(&self) -> Box<dyn Reflect>

Clones the value as a Reflect trait object. Read more
§

fn set(&mut self, value: Box<dyn Reflect>) -> Result<(), Box<dyn Reflect>>

Performs a type-checked assignment of a reflected value to this value. Read more
§

fn apply(&mut self, value: &(dyn Reflect + 'static))

Applies a reflected value to this value. Read more
§

fn reflect_kind(&self) -> ReflectKind

Returns a zero-sized enumeration of “kinds” of type. Read more
§

fn reflect_ref(&self) -> ReflectRef<'_>

Returns an immutable enumeration of “kinds” of type. Read more
§

fn reflect_mut(&mut self) -> ReflectMut<'_>

Returns a mutable enumeration of “kinds” of type. Read more
§

fn reflect_owned(self: Box<Fixed>) -> ReflectOwned

Returns an owned enumeration of “kinds” of type. Read more
§

fn reflect_partial_eq(&self, value: &(dyn Reflect + 'static)) -> Option<bool>

Returns a “partial equality” comparison result. Read more
§

fn reflect_hash(&self) -> Option<u64>

Returns a hash of the value (which includes the type). Read more
§

fn debug(&self, f: &mut Formatter<'_>) -> Result<(), Error>

Debug formatter for the value. Read more
§

fn serializable(&self) -> Option<Serializable<'_>>

Returns a serializable version of the value. Read more
§

fn is_dynamic(&self) -> bool

Indicates whether or not this type is a dynamic type. Read more
§

impl Struct for Fixed

§

fn field(&self, name: &str) -> Option<&(dyn Reflect + 'static)>

Returns a reference to the value of the field named name as a &dyn Reflect.
§

fn field_mut(&mut self, name: &str) -> Option<&mut (dyn Reflect + 'static)>

Returns a mutable reference to the value of the field named name as a &mut dyn Reflect.
§

fn field_at(&self, index: usize) -> Option<&(dyn Reflect + 'static)>

Returns a reference to the value of the field with index index as a &dyn Reflect.
§

fn field_at_mut(&mut self, index: usize) -> Option<&mut (dyn Reflect + 'static)>

Returns a mutable reference to the value of the field with index index as a &mut dyn Reflect.
§

fn name_at(&self, index: usize) -> Option<&str>

Returns the name of the field with index index.
§

fn field_len(&self) -> usize

Returns the number of fields in the struct.
§

fn iter_fields(&self) -> FieldIter<'_>

Returns an iterator over the values of the reflectable fields for this struct.
§

fn clone_dynamic(&self) -> DynamicStruct

Clones the struct into a DynamicStruct.
§

impl TypePath for Fixed
where Fixed: Any + Send + Sync,

§

fn type_path() -> &'static str

Returns the fully qualified path of the underlying type. Read more
§

fn short_type_path() -> &'static str

Returns a short, pretty-print enabled path to the type. Read more
§

fn type_ident() -> Option<&'static str>

Returns the name of the type, or None if it is anonymous. Read more
§

fn crate_name() -> Option<&'static str>

Returns the name of the crate the type is in, or None if it is anonymous. Read more
§

fn module_path() -> Option<&'static str>

Returns the path to the module the type is in, or None if it is anonymous. Read more
§

impl Typed for Fixed

§

fn type_info() -> &'static TypeInfo

Returns the compile-time info for the underlying type.
§

impl Copy for Fixed

Auto Trait Implementations§

§

impl RefUnwindSafe for Fixed

§

impl Send for Fixed

§

impl Sync for Fixed

§

impl Unpin for Fixed

§

impl UnwindSafe for Fixed

Blanket Implementations§

source§

impl<T> Any for T
where T: 'static + ?Sized,

source§

fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
§

impl<T, U> AsBindGroupShaderType<U> for T
where U: ShaderType, &'a T: for<'a> Into<U>,

§

fn as_bind_group_shader_type(&self, _images: &RenderAssets<Image>) -> U

Return the T ShaderType for self. When used in AsBindGroup derives, it is safe to assume that all images in self exist.
source§

impl<T> Borrow<T> for T
where T: ?Sized,

source§

fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
source§

impl<T> BorrowMut<T> for T
where T: ?Sized,

source§

fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
§

impl<T> Downcast<T> for T

§

fn downcast(&self) -> &T

§

impl<T> Downcast for T
where T: Any,

§

fn into_any(self: Box<T>) -> Box<dyn Any>

Convert Box<dyn Trait> (where Trait: Downcast) to Box<dyn Any>. Box<dyn Any> can then be further downcast into Box<ConcreteType> where ConcreteType implements Trait.
§

fn into_any_rc(self: Rc<T>) -> Rc<dyn Any>

Convert Rc<Trait> (where Trait: Downcast) to Rc<Any>. Rc<Any> can then be further downcast into Rc<ConcreteType> where ConcreteType implements Trait.
§

fn as_any(&self) -> &(dyn Any + 'static)

Convert &Trait (where Trait: Downcast) to &Any. This is needed since Rust cannot generate &Any’s vtable from &Trait’s.
§

fn as_any_mut(&mut self) -> &mut (dyn Any + 'static)

Convert &mut Trait (where Trait: Downcast) to &Any. This is needed since Rust cannot generate &mut Any’s vtable from &mut Trait’s.
§

impl<T> DowncastSync for T
where T: Any + Send + Sync,

§

fn into_any_arc(self: Arc<T>) -> Arc<dyn Any + Send + Sync>

Convert Arc<Trait> (where Trait: Downcast) to Arc<Any>. Arc<Any> can then be further downcast into Arc<ConcreteType> where ConcreteType implements Trait.
§

impl<T> DynamicTypePath for T
where T: TypePath,

source§

impl<T> From<T> for T

source§

fn from(t: T) -> T

Returns the argument unchanged.

§

impl<S> FromSample<S> for S

§

fn from_sample_(s: S) -> S

§

impl<T> FromWorld for T
where T: Default,

§

fn from_world(_world: &mut World) -> T

Creates Self using data from the given World.
§

impl<S> GetField for S
where S: Struct,

§

fn get_field<T>(&self, name: &str) -> Option<&T>
where T: Reflect,

Returns a reference to the value of the field named name, downcast to T.
§

fn get_field_mut<T>(&mut self, name: &str) -> Option<&mut T>
where T: Reflect,

Returns a mutable reference to the value of the field named name, downcast to T.
§

impl<T> GetPath for T
where T: Reflect + ?Sized,

§

fn reflect_path<'p>( &self, path: impl ReflectPath<'p> ) -> Result<&(dyn Reflect + 'static), ReflectPathError<'p>>

Returns a reference to the value specified by path. Read more
§

fn reflect_path_mut<'p>( &mut self, path: impl ReflectPath<'p> ) -> Result<&mut (dyn Reflect + 'static), ReflectPathError<'p>>

Returns a mutable reference to the value specified by path. Read more
§

fn path<'p, T>( &self, path: impl ReflectPath<'p> ) -> Result<&T, ReflectPathError<'p>>
where T: Reflect,

Returns a statically typed reference to the value specified by path. Read more
§

fn path_mut<'p, T>( &mut self, path: impl ReflectPath<'p> ) -> Result<&mut T, ReflectPathError<'p>>
where T: Reflect,

Returns a statically typed mutable reference to the value specified by path. Read more
§

impl<T> Instrument for T

§

fn instrument(self, span: Span) -> Instrumented<Self>

Instruments this type with the provided Span, returning an Instrumented wrapper. Read more
§

fn in_current_span(self) -> Instrumented<Self>

Instruments this type with the current Span, returning an Instrumented wrapper. Read more
source§

impl<T, U> Into<U> for T
where U: From<T>,

source§

fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

§

impl<F, T> IntoSample<T> for F
where T: FromSample<F>,

§

fn into_sample(self) -> T

§

impl<T> NoneValue for T
where T: Default,

§

type NoneType = T

§

fn null_value() -> T

The none-equivalent value.
§

impl<T> Pointable for T

§

const ALIGN: usize = _

The alignment of pointer.
§

type Init = T

The type for initializers.
§

unsafe fn init(init: <T as Pointable>::Init) -> usize

Initializes a with the given initializer. Read more
§

unsafe fn deref<'a>(ptr: usize) -> &'a T

Dereferences the given pointer. Read more
§

unsafe fn deref_mut<'a>(ptr: usize) -> &'a mut T

Mutably dereferences the given pointer. Read more
§

unsafe fn drop(ptr: usize)

Drops the object pointed to by the given pointer. Read more
source§

impl<R, P> ReadPrimitive<R> for P
where R: Read + ReadEndian<P>, P: Default,

source§

fn read_from_little_endian(read: &mut R) -> Result<Self, Error>

Read this value from the supplied reader. Same as ReadEndian::read_from_little_endian().
source§

fn read_from_big_endian(read: &mut R) -> Result<Self, Error>

Read this value from the supplied reader. Same as ReadEndian::read_from_big_endian().
source§

fn read_from_native_endian(read: &mut R) -> Result<Self, Error>

Read this value from the supplied reader. Same as ReadEndian::read_from_native_endian().
source§

impl<T> Same for T

§

type Output = T

Should always be Self
source§

impl<T> ToOwned for T
where T: Clone,

§

type Owned = T

The resulting type after obtaining ownership.
source§

fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
source§

fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more
§

impl<T, U> ToSample<U> for T
where U: FromSample<T>,

§

fn to_sample_(self) -> U

source§

impl<T, U> TryFrom<U> for T
where U: Into<T>,

§

type Error = Infallible

The type returned in the event of a conversion error.
source§

fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
source§

impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

§

type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
source§

fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.
§

impl<T> TypeData for T
where T: 'static + Send + Sync + Clone,

§

fn clone_type_data(&self) -> Box<dyn TypeData>

§

impl<T> Upcast<T> for T

§

fn upcast(&self) -> Option<&T>

§

impl<V, T> VZip<V> for T
where V: MultiLane<T>,

§

fn vzip(self) -> V

§

impl<T> WithSubscriber for T

§

fn with_subscriber<S>(self, subscriber: S) -> WithDispatch<Self>
where S: Into<Dispatch>,

Attaches the provided Subscriber to this type, returning a WithDispatch wrapper. Read more
§

fn with_current_subscriber(self) -> WithDispatch<Self>

Attaches the current default Subscriber to this type, returning a WithDispatch wrapper. Read more
§

impl<S, T> Duplex<S> for T
where T: FromSample<S> + ToSample<S>,

§

impl<T> Settings for T
where T: 'static + Send + Sync,

§

impl<T> WasmNotSend for T
where T: Send,

§

impl<T> WasmNotSendSync for T
where T: WasmNotSend + WasmNotSync,

§

impl<T> WasmNotSync for T
where T: Sync,