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index.js
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index.js
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const R = require("Reactive");
module.exports = {
/**
* No easing, no acceleration
* @param {ScalarSignal} t Input to easing function
* @return {ScalarSignal} Output from easing function
*/
linear: (t) => {
return t;
},
/**
* Accelerating from zero velocity
* @param {ScalarSignal} t Input to easing function
* @return {ScalarSignal} Output from easing function
*/
easeInQuad: (t) => {
return t.mul(t);
},
/**
* Decelerating to zero velocity
* @param {ScalarSignal} t Input to easing function
* @return {ScalarSignal} Output from easing function
*/
easeOutQuad: (t) => {
return t.mul(R.val(2).sub(t));
},
/**
* Acceleration until halfway, then deceleration
* @param {ScalarSignal} t Input to easing function
* @return {ScalarSignal} Output from easing function
*/
easeInOutQuad: (t) => {
const acc = t.mul(t).mul(2);
const dec = R.val(4).sub(t.mul(2)).mul(t).sub(1);
return t.lt(0.5).ifThenElse(acc, dec);
},
/**
* Accelerating from zero velocity
* @param {ScalarSignal} t Input to easing function
* @return {ScalarSignal} Output from easing function
*/
easeInCubic: (t) => {
return t.mul(t).mul(t)
},
/**
* Decelerating to zero velocity
* @param {ScalarSignal} t Input to easing function
* @return {ScalarSignal} Output from easing function
*/
easeOutCubic: (t) => {
const td = t.sub(1);
return td.mul(td).mul(td).add(1)
},
/**
* Acceleration until halfway, then deceleration
* @param {ScalarSignal} t Input to easing function
* @return {ScalarSignal} Output from easing function
*/
easeInOutCubic: (t) => {
const acc = t.mul(t).mul(t).mul(4);
const dec = t.sub(1).mul(t.mul(2).sub(2)).mul(t.mul(2).sub(2)).add(1);
return t.lt(0.5).ifThenElse(acc, dec);
},
/**
* Accelerating from zero velocity
* @param {ScalarSignal} t Input to easing function
* @return {ScalarSignal} Output from easing function
*/
easeInQuart: (t) => {
return t.mul(t).mul(t).mul(t);
},
/**
* Decelerating to zero velocity
* @param {ScalarSignal} t Input to easing function
* @return {ScalarSignal} Output from easing function
*/
easeOutQuart: (t) => {
const td = t.sub(1);
return R.val(1).sub(td.mul(td).mul(td).mul(td))
},
/**
* Acceleration until halfway, then deceleration
* @param {ScalarSignal} t Input to easing function
* @return {ScalarSignal} Output from easing function
*/
easeInOutQuart: (t) => {
const td = t.sub(1);
const acc = t.mul(t).mul(t).mul(t).mul(8);
const dec = R.val(1).sub(td.mul(td).mul(td).mul(td).mul(8));
return t.lt(0.5).ifThenElse(acc, dec);
},
/**
* Accelerating from zero velocity
* @param {ScalarSignal} t Input to easing function
* @return {ScalarSignal} Output from easing function
*/
easeInQuint: (t) => {
return t.mul(t).mul(t).mul(t).mul(t);
},
/**
* Decelerating to zero velocity
* @param {ScalarSignal} t Input to easing function
* @return {ScalarSignal} Output from easing function
*/
easeOutQuint: (t) => {
const td = t.sub(1);
return td.mul(td).mul(td).mul(td).mul(td).add(1);
},
/**
* Acceleration until halfway, then deceleration
* @param {ScalarSignal} t Input to easing function
* @return {ScalarSignal} Output from easing function
*/
easeInOutQuint: (t) => {
const td = t.sub(1);
const acc = t.mul(t).mul(t).mul(t).mul(t).mul(16);
const dec = td.mul(td).mul(td).mul(td).mul(td).mul(16).add(1);
return t.lt(0.5).ifThenElse(acc, dec);
},
};