Struct ParticleRng 

pub struct ParticleRng { /* private fields */ }

A deterministic xorshift64* pseudo-random generator used by particle emitters.

The engine intentionally avoids both the rand crate (dependency weight for a wasm target) and js_sys::Math::random (non-deterministic, and unusable outside a JS runtime, which would make host-side unit tests impossible). A seeded generator keeps emitter behavior reproducible.

Implementations

impl ParticleRng

Implements deterministic pseudo-random number generation for ParticleRng.

pub fn with_seed(seed: u64) -> ParticleRng

Creates a generator from the given seed. A zero seed is replaced with the default seed, since xorshift degenerates at zero.

Arguments

• u64 - The seed value.

Returns

• ParticleRng - The seeded generator.

pub fn next_u64(&mut self) -> u64

Advances the generator and returns the next 64-bit value.

Returns

• u64 - The next pseudo-random value.

pub fn next_f64(&mut self) -> f64

Returns the next pseudo-random value uniformly distributed in [0.0, 1.0).

Returns

• f64 - The next value in the unit interval.

pub fn range(&mut self, min: f64, max: f64) -> f64

Returns the next pseudo-random value uniformly distributed in [min, max).

Arguments

• f64 - The inclusive lower bound.
• f64 - The exclusive upper bound.

Returns

• f64 - The next value in the given range.

impl ParticleRng

pub fn new(state: u64) -> Self

Trait Implementations

impl Clone for ParticleRng

fn clone(&self) -> ParticleRng

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for ParticleRng

impl Debug for ParticleRng

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

Formats the value using the given formatter.

impl Default for ParticleRng

Implements Default for ParticleRng using the default seed.

fn default() -> ParticleRng

Returns the “default value” for a type.

impl PartialEq for ParticleRng

fn eq(&self, other: &ParticleRng) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl PartialOrd for ParticleRng

fn partial_cmp(&self, other: &ParticleRng) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

fn lt(&self, other: &Rhs) -> bool

Tests less than (for self and other) and is used by the < operator.

fn le(&self, other: &Rhs) -> bool

Tests less than or equal to (for self and other) and is used by the <= operator.

fn gt(&self, other: &Rhs) -> bool

Tests greater than (for self and other) and is used by the > operator.

fn ge(&self, other: &Rhs) -> bool

Tests greater than or equal to (for self and other) and is used by the >= operator.

impl StructuralPartialEq for ParticleRng