Struct SpringDesc 

pub struct SpringDesc {
    pub mass: f64,
    pub stiffness: f64,
    pub damping_ratio: f64,
}

The animation vocabulary: the shell-fed frame clock (FrameTime) plus the pure easing/interpolation/spring math a widget or app advances it through, flat-re-exported from frust-core::anim. Time enters from the shell during paint (PaintCtx::frame_time); nothing here reads a clock. Physical parameters of a damped spring (a mass on a spring with a damper).

damping_ratio is the dimensionless ζ: < 1 under-damped (overshoots and oscillates), == 1 critically damped (fastest non-overshooting settle), > 1 over-damped (slow, no overshoot). M3’s standard spring presets (which live in frust-theme, not here) are expressed in these terms.

Fields

mass: f64

Mass of the moving body (> 0).

stiffness: f64

Spring stiffness k (> 0); higher is snappier.

damping_ratio: f64

Damping ratio ζ (> 0); see the type docs.

Trait Implementations

impl Clone for SpringDesc

fn clone(&self) -> SpringDesc

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for SpringDesc

impl Debug for SpringDesc

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

Formats the value using the given formatter.

impl From<MotionSpring> for SpringDesc

Converts a MotionSpring token into the generic physics type AnimationController::fling/ Spring::new consume.

Mass is always 1.0 — every preset (this crate’s and each design system’s own) is defined purely in terms of damping ratio + stiffness, so mass has no token-level source to convert from.

fn from(spring: MotionSpring) -> SpringDesc

Converts to this type from the input type.

impl PartialEq for SpringDesc

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for SpringDesc