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/*
Adapted from https://github.com/mattdesl
Distributed under MIT License https://github.com/mattdesl/eases/blob/master/LICENSE.md
*/
export { identity as linear } from 'svelte/internal';
export function backInOut(t: number) {
const s = 1.70158 * 1.525;
if ((t *= 2) < 1) return 0.5 * (t * t * ((s + 1) * t - s));
return 0.5 * ((t -= 2) * t * ((s + 1) * t + s) + 2);
}
export function backIn(t: number) {
const s = 1.70158;
return t * t * ((s + 1) * t - s);
}
export function backOut(t: number) {
const s = 1.70158;
return --t * t * ((s + 1) * t + s) + 1;
}
export function bounceOut(t: number) {
const a = 4.0 / 11.0;
const b = 8.0 / 11.0;
const c = 9.0 / 10.0;
const ca = 4356.0 / 361.0;
const cb = 35442.0 / 1805.0;
const cc = 16061.0 / 1805.0;
const t2 = t * t;
return t < a
? 7.5625 * t2
: t < b
? 9.075 * t2 - 9.9 * t + 3.4
: t < c
? ca * t2 - cb * t + cc
: 10.8 * t * t - 20.52 * t + 10.72;
}
export function bounceInOut(t: number) {
return t < 0.5
? 0.5 * (1.0 - bounceOut(1.0 - t * 2.0))
: 0.5 * bounceOut(t * 2.0 - 1.0) + 0.5;
}
export function bounceIn(t: number) {
return 1.0 - bounceOut(1.0 - t);
}
export function circInOut(t: number) {
if ((t *= 2) < 1) return -0.5 * (Math.sqrt(1 - t * t) - 1);
return 0.5 * (Math.sqrt(1 - (t -= 2) * t) + 1);
}
export function circIn(t: number) {
return 1.0 - Math.sqrt(1.0 - t * t);
}
export function circOut(t: number) {
return Math.sqrt(1 - --t * t);
}
export function cubicInOut(t: number) {
return t < 0.5 ? 4.0 * t * t * t : 0.5 * Math.pow(2.0 * t - 2.0, 3.0) + 1.0;
}
export function cubicIn(t: number) {
return t * t * t;
}
export function cubicOut(t: number) {
const f = t - 1.0;
return f * f * f + 1.0;
}
export function elasticInOut(t: number) {
return t < 0.5
? 0.5 *
Math.sin(((+13.0 * Math.PI) / 2) * 2.0 * t) *
Math.pow(2.0, 10.0 * (2.0 * t - 1.0))
: 0.5 *
Math.sin(((-13.0 * Math.PI) / 2) * (2.0 * t - 1.0 + 1.0)) *
Math.pow(2.0, -10.0 * (2.0 * t - 1.0)) +
1.0;
}
export function elasticIn(t: number) {
return Math.sin((13.0 * t * Math.PI) / 2) * Math.pow(2.0, 10.0 * (t - 1.0));
}
export function elasticOut(t: number) {
return (
Math.sin((-13.0 * (t + 1.0) * Math.PI) / 2) * Math.pow(2.0, -10.0 * t) + 1.0
);
}
export function expoInOut(t: number) {
return t === 0.0 || t === 1.0
? t
: t < 0.5
? +0.5 * Math.pow(2.0, 20.0 * t - 10.0)
: -0.5 * Math.pow(2.0, 10.0 - t * 20.0) + 1.0;
}
export function expoIn(t: number) {
return t === 0.0 ? t : Math.pow(2.0, 10.0 * (t - 1.0));
}
export function expoOut(t: number) {
return t === 1.0 ? t : 1.0 - Math.pow(2.0, -10.0 * t);
}
export function quadInOut(t: number) {
t /= 0.5;
if (t < 1) return 0.5 * t * t;
t--;
return -0.5 * (t * (t - 2) - 1);
}
export function quadIn(t: number) {
return t * t;
}
export function quadOut(t: number) {
return -t * (t - 2.0);
}
export function quartInOut(t: number) {
return t < 0.5
? +8.0 * Math.pow(t, 4.0)
: -8.0 * Math.pow(t - 1.0, 4.0) + 1.0;
}
export function quartIn(t: number) {
return Math.pow(t, 4.0);
}
export function quartOut(t: number) {
return Math.pow(t - 1.0, 3.0) * (1.0 - t) + 1.0;
}
export function quintInOut(t: number) {
if ((t *= 2) < 1) return 0.5 * t * t * t * t * t;
return 0.5 * ((t -= 2) * t * t * t * t + 2);
}
export function quintIn(t: number) {
return t * t * t * t * t;
}
export function quintOut(t: number) {
return --t * t * t * t * t + 1;
}
export function sineInOut(t: number) {
return -0.5 * (Math.cos(Math.PI * t) - 1);
}
export function sineIn(t: number) {
const v = Math.cos(t * Math.PI * 0.5);
if (Math.abs(v) < 1e-14) return 1;
else return 1 - v;
}
export function sineOut(t: number) {
return Math.sin((t * Math.PI) / 2);
}
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