Struct Spring 

pub struct Spring {
    pub stiffness: f32,
    pub damping: f32,
}

A damped harmonic oscillator with unit mass, solved in closed form.

Numeric integration drifts with the frame rate and can blow up after a long frame. The analytic solution gives the same position at a given time however many frames were drawn on the way there.

Fields

stiffness: f32

Restoring force per unit of displacement.

damping: f32

Braking force per unit of velocity.

Implementations

impl Spring

pub const fn new(stiffness: f32, damping: f32) -> Self

A spring with this stiffness and damping.

pub const fn snappy() -> Self

For things that change place or size (the spring-snappy token).

pub const fn gentle() -> Self

For panels and sheets (the spring-gentle token).

pub fn from_response(response: f32, damping_ratio: f32) -> Self

A spring described the way designers think about it: response is the period of the undamped oscillation in seconds, and damping_ratio is 1.0 for no overshoot, less for some bounce.

pub fn sample(&self, x0: f32, v0: f32, t: f32) -> (f32, f32)

Displacement and velocity t seconds after starting from displacement x0 with velocity v0. The spring pulls toward zero.

Trait Implementations

impl Clone for Spring

fn clone(&self) -> Spring

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for Spring

impl Debug for Spring

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

Formats the value using the given formatter.

impl PartialEq for Spring

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for Spring