harusaki 0.0.2

Conventional SpringSimulations

春先 Harusaki

A super simple SpringSimulation API for Flutter, providing conventional defaults.

Usage

import 'package:harusaki/harusaki.dart';

final controller = AnimationController(/* ... */)

/// 1) just animate with the simulation...

controller.animateWith(Harusaki.normal())

/// 2) or grab a velocity value to animate with:

onPanEnd: (details) {
  final pps = details.velocity.pixelsPerSecond;
  final size = MediaQuery.of(context).size;

  final ddx = pixelsPerSecond.dx / size.width;
  final ddy = pixelsPerSecond.dy / size.height;
  final velocity = Offset(ddx, ddy).distance;

  controller.animateWith(Harusaki.normal(velocity));
}

API

We use the same defaults as react-spring, so you have the following spring simulations to choose from

• Harusaki.normal([double velocity = 0]) ("default" in react-spring)
• Harusaki.gentle([double velocity = 0])
• Harusaki.wobbly([double velocity = 0])
• Harusaki.stiff([double velocity = 0])
• Harusaki.slow([double velocity = 0])
• Harusaki.molasses([double velocity = 0])

and you can create a conventional simulation with

• Harusaki.spring(double stiffness, double damping, [double velocity])

Inspo

harusaki is inspired by lukepighetti/sprung and react-spring/react-spring.

The haru packagename was already taken, so we'll go with "the beginning of spring" as a motif ¯\_(ツ)_/¯