xtutils
Version:
Thuku's assorted general purpose typescript/javascript library.
104 lines • 3.98 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
exports._tween = exports.Easing = void 0;
/**
* Easing constants
*/
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;
/**
* Easing functions dictionary
*/
exports.Easing = {
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 - exports.Easing.easeOutBounce(1 - x),
easeOutBounce: x => {
const n1 = 7.5625;
const d1 = 2.75;
if (x < 1 / d1)
return n1 * x * x;
if (x < 2 / d1)
return n1 * (x -= 1.5 / d1) * x + 0.75;
if (x < 2.5 / d1)
return n1 * (x -= 2.25 / d1) * x + 0.9375;
return n1 * (x -= 2.625 / d1) * x + 0.984375;
},
easeInOutBounce: x => x < 0.5
? (1 - exports.Easing.easeOutBounce(1 - 2 * x)) / 2
: (1 + exports.Easing.easeOutBounce(2 * x - 1)) / 2,
};
/**
* Tween easing calculation
*
* @example
* _tween('linear', 200, 0, 1, 1000) //0.2
*
* @param name - easing name
* @param time - current time (or position) of the tween
* @param begin - beginning value of the property being animated
* @param change - change in value of the property being animated
* @param duration - total duration of the tween
* @returns - calculated value at the current time.
*/
const _tween = (name, time, begin, change, duration) => {
if (!exports.Easing.hasOwnProperty(name))
throw new TypeError(`Unsupported tween easing name (${name}).`);
const x = time / duration * 1, dx = exports.Easing[name](x);
return change * dx + begin;
};
exports._tween = _tween;
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