Spring curves for Flutter animations. Based on real physics equations with three damping curves.
Sprung is an easy-to-consume Curve that uses real physics equations to drive your animations.
Easy to consume #
AnimatedContainer( /// Critically damped by default curve: Sprung(), /// ... ),
AnimatedContainer( /// Easily adjust damping value curve: Sprung(16), /// ... ),
AnimatedContainer( /// Build a custom spring curve: Sprung( damping: 20, stiffness: 180, mass: 1.0, ), /// ... ),
Sprung has three opinionated curves,
AnimatedContainer( curve: Sprung.underDamped, /// ... ),
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