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Description:

sprung

sprung #
Sprung is an easy-to-consume Curve that uses real physics equations to drive your animations.
Easy to consume #
Sprung has three opinionated curves, Sprung.underDamped, Sprung.criticallyDamped, and Sprung.overDamped. This is the best way to get started.
AnimatedContainer(
curve: Sprung.underDamped,
/// ...
),
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When you want more fine control, use the default constructor which is critically damped, with overridable damping value.
AnimatedContainer(
/// Critically damped by default with a value of `20`
curve: Sprung(),
/// ...
),
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AnimatedContainer(
/// Easily adjust damping value.
curve: Sprung(19),
/// ...
),
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To build a fully custom spring simulation, use Sprung.custom. This allows you to define the spring's damping and stiffness, as well as the mass' mass and initial velocity.
AnimatedContainer(
/// Build a custom spring
curve: Sprung.custom(
damping: 20,
stiffness: 180,
mass: 1.0,
velocity: 0.0,
),
/// ...
),
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Based on Physics #
Using Flutter's physics engine which leverages Newton's Second Law of Motion, Hooke's Law, and velocity based damping, we implement the following equation to create realistic spring animations.

Believable motion #

Reliable accuracy #
Sprung exceeds Flutter specifications for curves by guaranteeing an error less than 1e-6. This amounts to a 0.0019px jitter at the beginning or end of a 1920px move.