sprung 1.0.0+9

Spring curves for Flutter animations. Based on real physics equations with three damping curves.

sprung

Sprung is an easy-to-consume Curve that uses real physics equations to drive your animations.

Easy to consume

AnimatedContainer(
  curve: Sprung(),
  /// ...
),

Sprung() also supports three damping curves, Damped.under, Damped.critically, and Damped.over.

AnimatedContainer(
  curve: Sprung(
    damped: Damped.under
  ),
  /// ...
),

Note: Sprung is critically damped by default.

Based on Physics

Using Newton's Second Law of Motion, Hooke's Law, and velocity based damping, we implement the following equation in three finite cases.

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.

Prior Art

https://medium.com/@dtinth/spring-animation-in-css-2039de6e1a03