| import { EasingFunction } from '@react-spring/types' |
|
|
| import { clamp } from './clamp' |
|
|
| export type Direction = 'start' | 'end' |
|
|
| type StepsEasing = (steps: number, direction?: Direction) => EasingFunction |
|
|
| const steps: StepsEasing = |
| (steps: number, direction: Direction = 'end') => |
| (progress: number) => { |
| progress = |
| direction === 'end' |
| ? Math.min(progress, 0.999) |
| : Math.max(progress, 0.001) |
| const expanded = progress * steps |
| const rounded = |
| direction === 'end' ? Math.floor(expanded) : Math.ceil(expanded) |
|
|
| return clamp(0, 1, rounded / steps) |
| } |
|
|
| |
| |
| |
| |
| interface EasingDictionary { |
| linear: (t: number) => number |
| easeInQuad: (t: number) => number |
| easeOutQuad: (t: number) => number |
| easeInOutQuad: (t: number) => number |
| easeInCubic: (t: number) => number |
| easeOutCubic: (t: number) => number |
| easeInOutCubic: (t: number) => number |
| easeInQuart: (t: number) => number |
| easeOutQuart: (t: number) => number |
| easeInOutQuart: (t: number) => number |
| easeInQuint: (t: number) => number |
| easeOutQuint: (t: number) => number |
| easeInOutQuint: (t: number) => number |
| easeInSine: (t: number) => number |
| easeOutSine: (t: number) => number |
| easeInOutSine: (t: number) => number |
| easeInExpo: (t: number) => number |
| easeOutExpo: (t: number) => number |
| easeInOutExpo: (t: number) => number |
| easeInCirc: (t: number) => number |
| easeOutCirc: (t: number) => number |
| easeInOutCirc: (t: number) => number |
| easeInBack: (t: number) => number |
| easeOutBack: (t: number) => number |
| easeInOutBack: (t: number) => number |
| easeInElastic: (t: number) => number |
| easeOutElastic: (t: number) => number |
| easeInOutElastic: (t: number) => number |
| easeInBounce: (t: number) => number |
| easeOutBounce: (t: number) => number |
| easeInOutBounce: (t: number) => number |
| steps: StepsEasing |
| } |
|
|
| const c1 = 1.70158 |
| const c2 = c1 * 1.525 |
| const c3 = c1 + 1 |
| const c4 = (2 * Math.PI) / 3 |
| const c5 = (2 * Math.PI) / 4.5 |
|
|
| const bounceOut: EasingFunction = x => { |
| const n1 = 7.5625 |
| const d1 = 2.75 |
|
|
| if (x < 1 / d1) { |
| return n1 * x * x |
| } else if (x < 2 / d1) { |
| return n1 * (x -= 1.5 / d1) * x + 0.75 |
| } else if (x < 2.5 / d1) { |
| return n1 * (x -= 2.25 / d1) * x + 0.9375 |
| } else { |
| return n1 * (x -= 2.625 / d1) * x + 0.984375 |
| } |
| } |
|
|
| export const easings: EasingDictionary = { |
| linear: x => x, |
| easeInQuad: x => x * x, |
| easeOutQuad: x => 1 - (1 - x) * (1 - x), |
| easeInOutQuad: x => (x < 0.5 ? 2 * x * x : 1 - Math.pow(-2 * x + 2, 2) / 2), |
| easeInCubic: x => x * x * x, |
| easeOutCubic: x => 1 - Math.pow(1 - x, 3), |
| easeInOutCubic: x => |
| x < 0.5 ? 4 * x * x * x : 1 - Math.pow(-2 * x + 2, 3) / 2, |
| easeInQuart: x => x * x * x * x, |
| easeOutQuart: x => 1 - Math.pow(1 - x, 4), |
| easeInOutQuart: x => |
| x < 0.5 ? 8 * x * x * x * x : 1 - Math.pow(-2 * x + 2, 4) / 2, |
| easeInQuint: x => x * x * x * x * x, |
| easeOutQuint: x => 1 - Math.pow(1 - x, 5), |
| easeInOutQuint: x => |
| x < 0.5 ? 16 * x * x * x * x * x : 1 - Math.pow(-2 * x + 2, 5) / 2, |
| easeInSine: x => 1 - Math.cos((x * Math.PI) / 2), |
| easeOutSine: x => Math.sin((x * Math.PI) / 2), |
| easeInOutSine: x => -(Math.cos(Math.PI * x) - 1) / 2, |
| easeInExpo: x => (x === 0 ? 0 : Math.pow(2, 10 * x - 10)), |
| easeOutExpo: x => (x === 1 ? 1 : 1 - Math.pow(2, -10 * x)), |
| easeInOutExpo: x => |
| x === 0 |
| ? 0 |
| : x === 1 |
| ? 1 |
| : x < 0.5 |
| ? Math.pow(2, 20 * x - 10) / 2 |
| : (2 - Math.pow(2, -20 * x + 10)) / 2, |
| easeInCirc: x => 1 - Math.sqrt(1 - Math.pow(x, 2)), |
| easeOutCirc: x => Math.sqrt(1 - Math.pow(x - 1, 2)), |
| easeInOutCirc: x => |
| x < 0.5 |
| ? (1 - Math.sqrt(1 - Math.pow(2 * x, 2))) / 2 |
| : (Math.sqrt(1 - Math.pow(-2 * x + 2, 2)) + 1) / 2, |
| easeInBack: x => c3 * x * x * x - c1 * x * x, |
| easeOutBack: x => 1 + c3 * Math.pow(x - 1, 3) + c1 * Math.pow(x - 1, 2), |
| easeInOutBack: x => |
| x < 0.5 |
| ? (Math.pow(2 * x, 2) * ((c2 + 1) * 2 * x - c2)) / 2 |
| : (Math.pow(2 * x - 2, 2) * ((c2 + 1) * (x * 2 - 2) + c2) + 2) / 2, |
| easeInElastic: x => |
| x === 0 |
| ? 0 |
| : x === 1 |
| ? 1 |
| : -Math.pow(2, 10 * x - 10) * Math.sin((x * 10 - 10.75) * c4), |
| easeOutElastic: x => |
| x === 0 |
| ? 0 |
| : x === 1 |
| ? 1 |
| : Math.pow(2, -10 * x) * Math.sin((x * 10 - 0.75) * c4) + 1, |
| easeInOutElastic: x => |
| x === 0 |
| ? 0 |
| : x === 1 |
| ? 1 |
| : x < 0.5 |
| ? -(Math.pow(2, 20 * x - 10) * Math.sin((20 * x - 11.125) * c5)) / 2 |
| : (Math.pow(2, -20 * x + 10) * Math.sin((20 * x - 11.125) * c5)) / 2 + |
| 1, |
| easeInBounce: x => 1 - bounceOut(1 - x), |
| easeOutBounce: bounceOut, |
| easeInOutBounce: x => |
| x < 0.5 ? (1 - bounceOut(1 - 2 * x)) / 2 : (1 + bounceOut(2 * x - 1)) / 2, |
| steps, |
| } as const |
|
|
