Struct Spring 

pub struct Spring { /* private fields */ }

Implementations

impl Spring

pub fn new(value: f32, params: SpringParams) -> Spring

pub fn set_target(&mut self, t: f32)

pub fn set_params(&mut self, params: SpringParams)

Swap the spring’s constants while keeping its current value AND velocity.

A gesture is usually not one spring but two phases of the same moving thing: a stiff follow while the pointer is down, a heavier settle once it lifts. Rebuilding the spring at the hand-off would zero the velocity and throw away exactly the momentum the settle is supposed to carry, so the params are swapped in place instead.

pub fn params(&self) -> SpringParams

pub fn snap(&mut self, v: f32)

pub fn value(&self) -> f32

pub fn velocity(&self) -> f32

pub fn target(&self) -> f32

pub fn is_settled(&self) -> bool

pub fn step(&mut self, dt: f32)

Advance by dt seconds. A long frame is integrated in equal substeps no longer than Self::max_substep, so a slow host (a software renderer, a stalled frame) lands where a fast one would instead of diverging.

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 Debug for Spring

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

Formats the value using the given formatter.