index.js — svelte Source File

Source Code

/*
Adapted from https://github.com/mattdesl
Distributed under MIT License https://github.com/mattdesl/eases/blob/master/LICENSE.md
*/

/**
 * @param {number} t
 * @returns {number}
 */
export function linear(t) {
	return t;
}

/**
 * @param {number} t
 * @returns {number}
 */
export function backInOut(t) {
	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);
}

/**
 * @param {number} t
 * @returns {number}
 */
export function backIn(t) {
	const s = 1.70158;
	return t * t * ((s + 1) * t - s);
}

/**
 * @param {number} t
 * @returns {number}
 */
export function backOut(t) {
	const s = 1.70158;
	return --t * t * ((s + 1) * t + s) + 1;
}

/**
 * @param {number} t
 * @returns {number}
 */
export function bounceOut(t) {
	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;
// ... (227 more lines)